China Shenzhen Perfect Precision Product Co., Ltd. company news

CNC programming refers to the whole working process from part drawing to obtaining CNC machining program. 1. Analyze part drawings and formulate process plans The contents of this work include: analyzing the part drawings and clarifying the processing contents and requirements; Determine the processing scheme; Choose a suitable CNC machine tool; Select or design tools and fixtures; Determine a reasonable cutting route and select a reasonable cutting amount. This work requires programmers to be able to analyze the technical characteristics, geometry, size and process requirements of the part drawing, and determine the processing method and processing route in combination with the basic knowledge of the use of CNC machine tools, such as the specification and performance of CNC machine tools, the function of CNC system, etc. 2. Mathematical processing After determining the process plan, it is necessary to calculate the tool center trajectory according to the geometric size of the part and the machining route, so as to obtain the tool position data. CNC systems generally have the functions of straight-line interpolation and arc interpolation. For machining simple plane parts composed of arcs and lines, only the coordinate values of the intersection or tangent point of adjacent geometric elements on the part contour need to be calculated, and the coordinate values of the starting point, end point and center of circle of each geometric element can be obtained, which can meet the programming requirements. When the geometric shape of the part is inconsistent with the interpolation function of the control system, it is necessary to carry out more complex numerical calculation. Generally, computer-aided calculation is required, otherwise it is difficult to complete. 3. Write part processing program After the above process treatment and numerical calculation are completed, the part processing program can be written. The programmer uses the program instructions of the CNC system to compile the processing program paragraph by paragraph according to the specified program format. Programmers should be very familiar with the functions, program instructions and codes of CNC machine tools before they can write correct processing programs. 4. Procedure inspection By inputting the programmed processing program into the CNC system, the processing work of the CNC machine tool can be controlled. Generally, the program should be inspected before formal processing. Generally, the machine tool can be idled to check the correctness of the machine tool action and motion trajectory, so as to test the program. On CNC machine tools with graphic simulation display function, the program can be checked by displaying the tool path or simulating the cutting process of the tool on the workpiece. For parts with complex shape and high requirements, easy to cut materials such as aluminum parts, plastic or paraffin can also be used to test the procedure. By checking the test piece, we can not only confirm whether the program is correct, but also know whether the machining accuracy meets the requirements. If you can use the same material as the processed parts for trial cutting, it can better reflect the actual processing effect. When you find that the processed parts do not meet the processing technical requirements, you can modify the program or take measures such as size compensation.

The development of machinery industry tends to be stable Since the beginning of this year, the growth rate of China's industrial added value has changed from lower than that of the national industry and manufacturing industry to higher than that of the industry and manufacturing industry. The specific data are: From January to June, the added value of the machinery industry increased by 7.8% year-on-year, 1.8 and 0.9 percentage points higher than that of the national industry and manufacturing industry in the same period, and 2.1 percentage points higher than that of the machinery industry in the same period of last year. The main business income of the machinery industry was 11.29 trillion yuan, an increase of 6.68% year-on-year, 3.21 percentage points higher than the same period last year. The total profit was 753.8 billion yuan, a year-on-year increase of 6.53%, 6.4 percentage points higher than the same period last year. With expert expenditure, more and more products achieved year-on-year growth among the 100 total products monitored by the machinery industry in the first half of the year. Taking June as the deadline, there are more than 60 products that have achieved year-on-year growth, accounting for 50.42%. The proportion of products with year-on-year decline was 49.58%. Among the declining products, the main types are: CNC machine tools, power generation equipment, smelting equipment, oil drilling equipment and other investment products, optical instruments, cameras and other products. There are also agricultural machinery such as tractors that have been told to grow before. The products that have maintained growth include automotive, electrical instruments, automotive instruments, high-voltage switchgear, optical cable consumption, technology development, environmental protection and other related products. Intelligent manufacturing is an important way for the transformation of machinery industry Under the influence and guidance of the relevant policies of "made in China 2025", the machinery industry is also moving towards upgrading and innovation. Among them, China has made independent research and development and made breakthroughs in high-end equipment such as large-scale nuclear power, hydropower, thermal power and wind power equipment, ultra-high voltage AC and DC and flexible DC transmission and transformation equipment, key equipment for oil and gas long-distance pipelines, key equipment for large-scale coal chemical industry, high-end CNC machine tools and so on. In the machinery industry, the innovation ability is constantly advancing. Because the market of traditional products has been in a downturn, innovation has become the development path chosen by more and more machinery industry enterprises. According to various data, the investment of machinery industry enterprises in the construction of innovation ability and the exploration of innovation mode is also gradually increasing.

What kind of structural form of the tool used in machining is related to the material of the tool, the complexity of the cutting edge, the size of the tool, the processing batch and the processing method? Yes, there is a close connection between them. When choosing the tool structure, we must fully consider the influence of these factors. Next, let's analyze it. Influence of tool material on structure Different materials are suitable for manufacturing cutting tools with different structures. Generally, in machining, the cutting tools with integral structure are mostly made of high-speed steel, while the cutting tools with clamp structure and welding structure are mostly made of cemented carbide. Influence of cutting edge complexity on structure The structural form of machining tools is also related to the complexity of cutting edges. Generally speaking, when the cutting edge of the prop is complex, the integral structure is conducive to ensuring the strength of the cutting edge. The cutters with this design method include vertical milling cutters with spiral chip holding grooves, fried dough twist drills and reamers. Most of them adopt an integral structure and have complex cutting edges. The cutting edge of welded structural tools should not be too complex, and they are usually made into straight grooves or small spiral angles. The cutting edge of machine clamp tool is generally simpler. Influence of tool size on structure The size of the tool often affects the structure of the tool. In machining, the cutters with smaller sizes generally adopt the integral structure, while those with larger sizes generally adopt the machine clamp structure. For example, face milling cutters are usually made into machine clamp indexable type, which is also a measure to effectively ensure the rigidity of cutters. Influence of machining batch on tool structure The size of the machining batch will also have a certain impact on the structural form of the tool, and the manufacturer needs to select the appropriate tool structure according to the specific situation. In general, tools with integral structure can be considered for processing single pieces or small batches of workpieces. When processing large batches of workpieces, machine clamp indexable tools should be used as much as possible. Influence of machining type on tool structure Whether to adopt numerical control machining method also determines which structure of tool should be selected. Once the integral tool is damaged, it will take a long time to change and adjust the tool when replacing it with a new one. The tool with indexable structure of the machine clamp has a much shorter time of indexing and replacement, and basically does not need to be readjusted. It can be quickly adjusted to meet the requirements by changing the compensation value of the tool. This advantage is very obvious in CNC machining. Therefore, when CNC machining is carried out, the tool with indexable structure of machine clamp should be used as much as possible. However, due to the existence of certain welding internal stress, the stability and accuracy of the welding tool will be destroyed, and the tool bar can hardly be reused after the tool is scrapped. Therefore, in actual production, the tool with this structure should be used as little as possible.

CNC machine tools have many similarities with ordinary machine tools in processing technology, but due to the high requirements of CNC machine tools, the process design of CNC machine tools is often much more complex than ordinary machine tools. In the process of CNC machining process design, it mainly includes three steps: the selection of CNC machining process content, the analysis of CNC machining process, and the design of CNC machining process route. Now let's introduce how to design the CNC machining process for the hook net? 1、 Selection of CNC machining process content For a part, not all machining processes are suitable for completion on CNC machine tools, but often only part of the process content is suitable for CNC machining. This requires a careful process analysis of the part drawing and the selection of those most suitable and most in need of NC machining. When considering the selection of content, we should combine the actual situation of the enterprise's equipment, based on solving difficult problems, overcoming key problems and improving production efficiency, and give full play to the advantages of NC machining. 2、 Analysis of CNC Machining Technology The CNC machining process of machined parts involves a wide range of issues. The following puts forward some main contents that must be analyzed and reviewed in combination with the possibility and convenience of programming. 1. Dimension marking shall conform to the characteristics of CNC machining In CNC programming, the dimensions and positions of all points, lines and surfaces are based on the programming origin. Therefore, it is better to directly give the coordinate dimension on the part drawing, or try to note the dimension with the same benchmark. 2. The conditions of geometric elements should be complete and accurate In programming, programmers must fully grasp the parameters of geometric elements that constitute the contour of parts and the relationship between various geometric elements. Because all geometric elements of the part contour should be defined during automatic programming, and the coordinates of each node should be calculated during manual programming. No matter what point is unclear or uncertain, programming cannot be carried out. However, because part designers do not consider carefully or are ignored in the design process, parameters are often incomplete or unclear, such as whether arc and straight line, arc and arc are tangent, intersection or separation. Therefore, when reviewing and analyzing the drawings, we must carefully calculate and contact the designers in time if any problems are found. 3. Reliable positioning reference In CNC machining, the machining process is often concentrated, and it is very important to locate with the same benchmark. Therefore, it is often necessary to set some auxiliary benchmarks or add some process bosses on the blank. 4. Unified geometric type and size It is better to adopt unified geometric type and size for the shape and inner cavity of parts, so as to reduce the number of tool changes. It is also possible to apply control programs or special programs to shorten the program length. The shape of the parts shall be as symmetrical as possible, which is convenient for programming by using the mirror processing function of the NC machine tool, so as to save programming time. 3、 Design of CNC machining process route The main difference between CNC machining process route design and general machine tool machining process route design is that it often does not refer to the whole process from blank to finished product, but only the specific description of several CNC machining processes. Therefore, it must be noted in the process route design that since the CNC machining process is generally interspersed in the whole process of part processing, it should be well connected with other machining processes.

Green manufacturing, also known as environmental conscious manufacturing. This is a modern manufacturing mode that comprehensively considers manufacturing quality, environmental impact and resource efficiency, so that human production process can be in harmony with environmental protection and resource utilization as far as possible. Green manufacturing in the field of machining at this stage mainly has the following manifestations: Dry cutting technology Dry cutting technology in machining is a technology of cutting without using cutting fluid. It can avoid the damage of cutting fluid discharge to the environment, but it has high requirements for the geometric structure, wear resistance, high temperature resistance and adhesion resistance of cutting tools. The machine tool used also needs to be equipped with circulating cooling system, vertical shaft and inclined bed, so as to eliminate heat and cutting debris. Similarly, there is quasi dry cutting technology, which combines the advantages of dry and wet machining. A layer of lubricating oil is sprayed on the cutting edge of the tool to form an oil film between the tool and the workpiece. The amount of cutting fluid used is only tens of thousands of times that of wet cutting, but it can effectively play the role of lubrication. In addition, there is a wind cooling cutting technology, which is dehumidified and cooled to minus 30 degrees Celsius air, sent to the cutting part, while spraying a small amount of harmless vegetable oil, which can also achieve rust prevention and lubrication. Dust collecting equipment is installed on the opposite side of the air nozzle to collect waste and dust, and the chips are filtered out through the dust collector. Water jet processing technology Water jet processing technology is to use pure water or the liquid added with some additives in the water to form a high-speed liquid flow of 300 to 900 meters per second after passing through the supercharger and liquid storage accumulator, which is sprayed onto the surface of the workpiece to achieve the purpose of removing materials. Antifriction Technology In machining, proper use of antifriction agents can effectively reduce the friction resistance produced by machining, reduce mechanical wear, reduce energy consumption and prolong the service life of equipment. In addition to using antifriction agents, metal antifriction agents can be mixed into lubricating oil, which can also achieve the purpose of energy saving and consumption reduction. High quality clean surface technology For some important parts that require high wear resistance, ion beam assisted coating technology can be used to synthesize various high-quality films at room temperature by using a series of physical and chemical changes in the process of depositing atoms and bombarding ions. The application of self swimming coating, a new energy-saving surface coating technology, can greatly simplify the subsequent wastewater treatment process, which belongs to a pollution-free and clean production process because it does not need phosphating process and there is no participation of heavy metals in the system. In addition, self priming coating requires fewer work stations, simpler operation and lower operation cost. Rapid prototyping manufacturing technology This is a manufacturing technology that can quickly generate models or parts under the control of computers, relying on the existing CAD data and using the method of accurate material accumulation. Precise stacking is the process of stacking points into faces, then stacking faces into three-dimensional structures, and finally generating entities. Using this technology, solid workpieces with various complex structures can be generated without molds. The materials involved include paper, plastic, metal and ceramics. Rapid prototyping manufacturing technology can not only save resources, reduce manufacturing costs, but also reduce the environmental pollution caused by processing waste, but also greatly improve the manufacturing speed of new product samples. Process simulation technology Process simulation technology simulates the processing process in the real environment in the virtual environment through simulation, experimental testing and other methods, shows the physical and chemical changes and defect evolution of materials in this process, so as to predict their performance and quality, and achieve the purpose of optimizing process design. This technology is mainly used in hot working process.

Main features of multi axis machining center First of all, multi axis NC machining can realize process integration, which not only improves the effectiveness of the process, but also reduces the conversion of datum and makes the machining accuracy easier to be guaranteed because the parts only need to be clamped once in the whole machining process. Secondly, because the multi axis machining center has more complete functions, it can shorten the processing chain and reduce the number of equipment. Although the price of a single machining center is not cheap, the total equipment price may be reduced, and the maintenance cost, tooling and fixture cost, and the floor area of the workshop can be reduced accordingly. Next, because the multi axis machining center can shorten the process chain of machining, the processing tasks that used to be performed by multiple positions in turn can be completed by using multi axis equipment with only one job, which is very effective for simplifying production management and saving labor costs. The more complex the workpiece is, the more obvious this feature is. Finally, enterprises in aerospace, automotive and other fields need to process many parts or molds with complex shapes and high precision requirements in the process of R & D. With the help of multi axis machining center, it can effectively solve the problem of machining accuracy, greatly shorten the research and development cycle, and improve the success rate of new products. Main advantages of multi axis machining center Just now, we introduced the main features of multi axis CNC machining centers. Next, we will talk about the specific advantages of this kind of equipment in processing. First of all, the workpiece can complete the processing of five faces after one clamping. If equipped with a 5-axis high-end CNC system, it can also process complex spatial surfaces with high precision. This advantage is very suitable for processing forming molds for auto parts, aircraft structural parts and other workpieces. Multi axis machining center not only simplifies the processing process, but also shortens the processing cycle. Compared with traditional processing equipment, the surface quality of multi axis machining center is also better. For example, when processing headlamp molds, due to its special optical effect requirements, there are very high index requirements for the processing accuracy and surface finish of many small curved surfaces used for reflection. At this time, the use of multi axis machining center can well achieve the mirror effect and meet the needs of products. The traditional processing equipment and processing technology are almost impossible to achieve this goal. Secondly, the machining efficiency of multi axis machining center is high, the speed is fast, and the quality can be guaranteed. Using five axis linkage machine tool to process the mold can complete the mold processing task at the fastest speed, deliver faster, and it is easier to win the favor of buyers. Moreover, the mold quality can be well guaranteed, and it is easier to modify. In the traditional mold processing, the vertical machining center is generally used to mill the workpiece. With the continuous development of mold manufacturing technology, industry insiders generally believe that using ball end milling cutter to process can bring better results, but because the linear speed of the bottom surface of the vertical machining center is zero, matching ball end milling cutter will result in poor machining finish. Using 4-axis or 5-axis linkage machine tool processing technology to process molds can overcome the above defects and obtain ideal processing quality.

Green manufacturing system of machining process planning In the machining process, green manufacturing and production process are mainly combined. In the process of green manufacturing, the first thing we should consider is the rational utilization of resources and environmental protection. By planning the machining process into a process with a green manufacturing system, in order to better green resources, adhere to the concept of green production.  Impact of machining on environment and resources 1. Serious waste of resources In the process of machining, there are many cases of serious waste of resources, which are mainly reflected in two aspects: one is the consumption of raw materials, the other is the consumption of auxiliary materials in processing. The consumption of raw materials is mainly the loss in the actual machining process and the use of raw materials. For example, in production, many metal materials are wasted because they do not face the problem of errors. The consumption of auxiliary materials in processing is mainly due to the loss of auxiliary materials used in the processing process due to some improper operations. For example, for some tools that may be used in the process of mechanical production, they will be lost after being cut. Serious consumption of mechanical equipment In the process of machining, the serious consumption of mechanical equipment is mainly reflected in the wear of machine tools. For example, in machining, many machine tools will have serious friction. Moreover, the equipment consumption produced by some machine tools is also reflected by the consumption of energy, and it will also consume more auxiliary process energy. Therefore, in the process of machining, we need to pay attention to each process in order to avoid affecting the consumption of mechanical equipment as a whole.   Seriously affect the environment In the process of machining, the impact on the environment mainly has two aspects, one is the storage of waste, the other is the pollution of machining noise. These two kinds of mechanical processing enterprises need to pay attention to. Optimization measures Machining should find ways to improve these environmental problems, create a green manufacturing system, improve the parameters of green manufacturing technology and the route of green manufacturing process according to the situation of its own enterprises, and move towards the path of sustainable development.

In the machining of aluminum and magnesium metals, there is a risk of dust explosion. The main reasons for this risk include the lack of necessary prevention and control measures for the dust removal system, or hot work in the dust explosion risk area, and the failure to clean up the dust deposit as required. To completely eliminate the risk of aluminum magnesium dust explosion, the following are what you should do. Take necessary preventive and control measures for dust removal system The first point is to pay attention to selecting the correct dust removal process. When using dry dust collectors for dust removal, bag type external filter dust removal or cyclone dust removal process must be adopted; When using wet dust collector for dust removal, water washing or water curtain dust removal process must be adopted. The second point is that the dust removal system should be equipped with some hardware facilities that can prevent and control dust explosion according to the characteristics of dust explosion, such as setting up monitoring devices, and selecting one or more explosion-proof devices to reduce the explosion risk. The third point is that the dust collector must work under negative pressure. The fourth point is to ensure that the dust removal system cannot be connected with the air duct and equipment with combustible gas, high-temperature gas, smoke or other industrial gas, so as to avoid accidental ignition of dust. The fifth point is to note that the air duct and dust collector of the dust removal system must not have sparks entering, but also pay attention to the cleanness in the air duct, and the dust accumulation thickness must not exceed 1mm. When designing the wind speed of the air duct, it is necessary to keep the dust concentration in the air duct not greater than 25% of the lower explosion limit, and the minimum wind speed is usually not less than 23 meters per second. The sixth point is that the filter bag of dry-type dust collector must be made of filter material with flame retardant function and anti-static function, and its operation condition should be continuous ash unloading and continuous ash conveying. The seventh point is that when designing and manufacturing the wet dust collector, the design of its water pressure and water consumption must be able to meet the requirements of removing the dust entering the dust collector. The circulating water should ensure that the water quality is clean. The water storage tank, water quality filter and water quality filter device should not be closed. Ventilation airflow should be set, and there should be no sediment and mud in the tank. Code for safe operation in dust explosion hazardous areas The first point is that hot work and inspection and maintenance operations are strictly prohibited in the operation area. If the above operations must be carried out, they must be carried out under the condition of completely stopping processing operations, and necessary fire safety measures must be taken for hot work. The second point is that in the dust explosion risk area, the dust in the workplace and equipment and facilities should be cleaned in time, and the thickness of dust accumulation should not exceed 0.8 mm. The third point is that during the cleaning operation, the cleaning method that does not produce dust and the cleaning tool that does not produce sparks should be adopted. The fourth point is never to contact the dust collected by cleaning with rust, water or other chemicals or damp them, which is prone to exothermic reaction and spontaneous combustion. It should be put into containers made of non aluminum metal materials or anti-static materials with anti rust surface treatment, and stored in designated safe areas. The collected dust should be treated harmlessly. The fifth point is that the safety operation regulations must be strictly observed during operation, and the tools used must ensure that there will be no collision sparks.

Determine the cutting route and arrange the processing sequence The tool path is the motion path of the tool in the whole machining process. It not only includes the content of the work step, but also reflects the order of the work step. The cutting route is one of the bases for programming. Pay attention to the following points when determining the cutting route: 1. Seeking the shortest processing route: reducing the empty tool time can save nearly twice the positioning time and improve the processing efficiency. 2. The final contour is finished in one cutting: in order to ensure the roughness requirements of the workpiece contour surface after machining, the final contour should be arranged to be processed continuously in the last cutting. 3. Select the cutting in and cutting out direction: when considering the cutting in and cutting out (cutting in and cutting out) route of the tool, the cutting out or cutting in point of the tool should be on the tangent along the contour of the part to ensure the smooth contour of the workpiece; Avoid scratching the workpiece surface by vertically cutting up and down on the contour surface of the workpiece; Try to reduce the pause during contour machining (elastic deformation caused by sudden change of cutting force) to avoid leaving knife marks. 4. Select the route to make the workpiece deform less after machining: for slender parts or thin plate parts with small cross-sectional area, the cutting route should be arranged by several times of cutting to the final size or by symmetrically removing the allowance. When arranging the work steps, the work steps with less damage to the rigidity of the workpiece should be arranged first. 2、 Determine positioning and clamping scheme The following problems should be paid attention to when determining the positioning and clamping scheme: (1) Try to unify the design basis, process basis and programming calculation basis; (2) Concentrate the process as much as possible, reduce the clamping times, and try to process all the surfaces to be processed after one clamping; (3) Avoid using the clamping scheme with long manual adjustment time; (4) The action point of the clamping force should fall on the part with good rigidity of the workpiece. 3、 Determine the relative position of the tool and the workpiece For CNC machine tools, it is very important to determine the relative position between the tool and the workpiece at the beginning of processing. This relative position is achieved by confirming the tool setting point. Tool setting point refers to the reference point that determines the relative position of the tool and the workpiece through tool setting. The tool setting point can be set on the machined part or at a certain position on the fixture that has a certain size connection with the part positioning benchmark. The tool setting point is often selected at the machining origin of the part. The selection of tool setting points should follow the following principles: (1) The selected tool setting point should make programming simple; (2) The tool setting point should be located at a position that is easy to align and determine the machining origin of parts; (3) The tool setting point should be selected at a convenient and reliable position for inspection during processing; (4) The selection of tool setting points should be conducive to improving the machining accuracy. 4、 Determine the cutting amount For high-efficiency metal cutting machine tools, the processed materials, cutting tools and cutting parameters are the three major elements. These conditions determine the processing time, tool life and processing quality. Economic and effective machining methods require reasonable selection of cutting conditions.

Reduce invalid power consumption 1. Electricity for lighting: many employees do not have much awareness about this. They should form the habit of people walking with the lights off to avoid a small number of people consuming large areas of lighting. 2. Power consumption of air conditioning: for the management of office air conditioning, reduce the use time, and turn off the air conditioning when there is no one. 3. Power consumption of copier and water dispenser: the power supply can be turned off when the copier is used up. During interval measurement, if the interval is more than half an hour, the power supply should be turned off. It is not allowed to turn on the power supply for a long time without using it. 4. Power consumption of mold room and production machinery: in the workshop, when the power consumption of mold room and production machinery is not used, the film needs to be shut down immediately to avoid invalid operation of machinery. 5. Set up special operators: set up special responsible persons for air conditioning, testing equipment, mold room and production line to be responsible for the opening and closing of equipment. Reduce material consumption 1. Centralized management of small materials: many employees often choose to ignore small materials. In fact, collecting them can complete other production, which needs attention. 2. Avoid material damage: conduct centralized training for staff operations to minimize material damage caused by errors in the processing process. 3. Avoid bad incoming materials: many times, there will be bad incoming materials, such as material loss caused by screening or rework in the workshop. In this regard, the purchasing department should pay attention to the quality of incoming materials and try to avoid bad incoming materials. Reduce invalid hours 1. Reasonable and standardized workshop layout: the reasonable layout should be based on the principle of the shortest logistics, the shortest handling distance and the least handling times. 2. Reasonably regulate the location of materials: place materials in a reasonable location to make the action most economical and efficient in production and processing. 3. Reduce maintenance man hours: every enterprise hopes to reduce maintenance man hours, which requires workshops to strictly implement process discipline and reduce product defect rate. 4. Reduce line change time: when the workshop carries out work every day, it needs to make a daily plan and mark it clearly on the production Kanban. Reduce labor cost 1. Formulate the accuracy rate of production plan: before production, the production department needs to formulate the accuracy rate of production plan, accurately plan the human demand of the workshop, and reasonably allocate human resources. 2. Provisions of daily production plan: the production department should ensure the balance of daily production plan according to the quota of working hours.