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

Under the influence of the rapidly discovered technology, the processing technology is also constantly improving. In order to solve the non-conductive non-metallic materials that cannot be easily processed, ultrasonic processing came into being. This kind of machining solves the defects of previous EDM intelligent machining of metal materials, so that non-metallic brittle and hard materials can also be machined. The future development of ultrasonic machining is very promising. Here is a detailed introduction from many aspects. 1. Two dimensional ultrasonic technology With the increasing difficulty of machining materials, especially for some aerospace parts, one-dimensional ultrasonic machining can no longer meet the production needs of high standards and strict requirements, so two-dimensional ultrasonic machining technology was born at this time. Now this technology has been attached importance to by advanced countries. In the United States, Germany, Britain and Singapore, two-dimensional ultrasound technology has been studied. Under the influence of ultrasonic elliptical vibration cutting, the arc radius of cemented carbide tool tip has many geometric shapes, especially the influence of the element and radius of the tool on one-dimensional ultrasonic vibration cutting performance. Due to the rapid wear of the tool, brittle materials are easy to break and stick to the tool, making the traditional vibration cutting accuracy results are not accurate. Ultrasonic elliptical cutting can solve this problem well, and get a practical ultra precision mold, which can be successfully applied to the forming of glass. 2. Ultrasonic vibration cutting technology This technology is created in practice. The process experiment of ultrasonic vibration cutting is carried out on the hobbing of spur gear produced by FAW gearbox factory,. And restore various processing parameters on the production site for small batch trial production, and obtain satisfactory results. With the wide application of this method, the following aspects can be studied: the use of new tool materials and efficient vibration cutting system, and the in-depth study of vibration cutting machine. 3. Micro ultrasonic machining In principle, micro ultrasonic machining is very similar to conventional ultrasonic machining, which is also achieved by reducing abrasive particle size, tool diameter and ultrasonic amplitude. Micro ultrasonic machining has its own advantages. Compared with traditional machining technology, ultrasonic machining has no great requirements for the conductivity and thermophysical effects of materials, and can process three-dimensional shapes, which determines the particularity of micro ultrasonic machining in the processing of non-metallic materials. 4. CNC Ultrasonic Machining Numerical control is the development trend of mechanical equipment in the future. In China, in the processing and production of manufacturing industries and enterprises, traditional machine tools still account for a large proportion. Milling machines, grinders, lathes, drilling machines, boring machines, etc. all of them use their cutting tools to do the corresponding linear motion, but slowly these accuracies can no longer meet the current needs. The application of ultrasonic technology to CNC machine tools can make the cutter obtain irregular movement mode and further improve the machining accuracy. Ultrasonic machining is now more and more widely used in production and processing, because it overcomes the shortcomings that it is not easy to be processed, effectively improves the processing accuracy, shortens the processing time, and brings convenience to production and processing.

The application scope of NC machining technology in industrial manufacturing field roughly includes the following aspects: 1. Box parts There are many box parts in machining and manufacturing enterprises. This kind of product generally has more holes and working surfaces, and has more complex cavities. The machining face has the requirements of shape and position accuracy. If it is processed by ordinary equipment, it requires multiple process conversion benchmarks to achieve, and the accuracy is difficult to achieve. Using machining centers to process box parts, especially multi axis CNC equipment, can complete the processing by virtue of its own accuracy level and the characteristics of high processing efficiency, good stiffness and automatic tool change. In the process of machining, as long as the technological process is formulated and reasonable special fixtures and cutters are used, the technological problems such as high precision requirements and complex processes of box parts can be solved. 2. Complex surface parts NC machining mainly depends on the interpolation principle. Under the preset program, many complex surface shapes can be processed, and the manufacturing accuracy that ordinary equipment cannot reach can be achieved. For example, in aerospace and transportation manufacturing, parts with complex surfaces are common. This kind of parts with complex curved surface contour generally cannot achieve the predetermined machining accuracy through ordinary equipment processing or precision casting. It is necessary to adopt multi axis machining center, cooperate with special tools and automatic programming technology, which can greatly improve the production efficiency, meet the machining accuracy requirements of product curved surface shape, and ensure the consistency of products. Make the automatic processing of complex parts simple. 3. Irregular parts Heterosexual parts are also common in production and processing. This kind of parts has the characteristics of irregular shape. In ordinary equipment, it is impossible to achieve one-time positioning, so it is necessary to frequently convert the positioning datum to process different working surfaces. If the machining center is adopted, the polyhedron can be processed, and then combined with multi axis linkage, more working faces can be manufactured under the condition of clamping together, which can effectively reduce the machining error caused by multiple positioning. 4. Typical application of new product trial production CNC machining center has a wide range of adaptability and high flexibility. When changing the processing object, it only needs to compile and input new programs, equip with necessary tooling and cutting tools to realize processing, which provides great convenience for single piece, small batch, multi variety production and new product trial production, and also reduces the trial production cycle.

Crankshaft is one of the key components of automobile engine, and its performance directly affects the service life of automobile. When the crankshaft works, it bears heavy load and changing bending moment and torque. The common failure forms are bending fatigue fracture and journal wear. Therefore, the crankshaft material is required to have high rigidity, fatigue strength and good wear resistance. 1. Foundry Technology (1) Smelting For the melting of high-grade cast iron, large capacity medium frequency furnace or variable frequency medium frequency furnace will be used for melting, and direct reading spectrometer will be used to detect the composition of molten iron. Nodular cast iron is treated by subcontracting, new varieties of nodulizing agents are developed, and advanced inoculation methods such as flow inoculation, in mold inoculation and compound inoculation are adopted. The parameters of the melting process are controlled by microcomputer and displayed on the screen. (2) Styling EPC will be developed and popularized. In sand mold casting, non box injection molding and extrusion molding will be paid attention to and continue to be popularized and applied in new or rebuilt plants. The original high-voltage molding line will continue to be used, and some key components will be improved to realize automatic core assembly and core lowering. 2. Forging technology Automatic lines with hot die forging press and electro-hydraulic hammer as the main engines are the development direction of forged crankshaft production. These production lines will generally adopt precision cutting, roll forging (wedge cross rolling) billet making, medium frequency induction heating, etc. 3. Machining technology In the rough machining of crankshaft, advanced equipment such as CNC lathe, CNC internal milling machine and CNC lathe broaching machine will be widely used for CNC turning, internal milling and turning broaching of main journal and connecting rod journal, so as to effectively reduce the deformation of crankshaft machining. Crankshaft finishing will widely use CNC controlled crankshaft grinder to finish grind its journal. This kind of grinder will be equipped with automatic dynamic balancing device of grinding wheel, automatic tracking device of center frame, automatic measurement, automatic compensation device, automatic dressing of grinding wheel, constant linear speed and other functional requirements to ensure the stability of grinding quality. It is estimated that the current situation of high-precision equipment relying on imports will not change in the short term. 4. Heat treatment technology and surface strengthening technology (1) Crankshaft medium frequency induction hardening The crankshaft medium frequency induction quenching will adopt the microcomputer monitoring closed-loop medium frequency induction heating device, which has the characteristics of high efficiency, stable quality and controllable operation. (2) Crankshaft soft nitriding For crankshafts produced in large quantities, in order to improve product quality, a microcomputer controlled nitrogen based atmosphere gas soft nitriding production line will be used in the future. Nitrogen based atmosphere gas soft nitriding production line is composed of front cleaner (cleaning and drying), preheating furnace, soft nitriding furnace, cooling oil tank, rear cleaner (cleaning and drying), control system and gas production and distribution system. (3) Crankshaft surface strengthening technology Spheroidal graphite cast iron crankshaft fillet rolling strengthening will be widely used in crankshaft processing. In addition, compound strengthening processes such as fillet rolling strengthening and journal surface quenching will also be widely used in crankshaft processing. Forged steel crankshaft strengthening methods will more adopt journal and fillet quenching. Main causes of crankshaft fracture: (1) The engine oil deteriorates after long-term use; The serious overload and over coupling cause the engine to run overloaded for a long time and cause the Bush burning accident. The crankshaft was severely worn due to the burning of engine pads. (2) After the engine is repaired, the loading has not gone through the running in period, that is, the engine is overloaded for a long time, which makes the crankshaft load exceed the allowable limit. (3) Surfacing welding was used in the repair of the crankshaft, which destroyed the dynamic balance of the crankshaft and did not do balance verification. The imbalance exceeded the standard, causing greater vibration of the engine and fracture of the crankshaft. (4) Due to poor road conditions and serious overloading of vehicles, the engine often operates within the torsional vibration critical speed, and the failure of the shock absorber will also cause the torsional vibration fatigue damage and fracture of the crankshaft.

Characteristics of oblique rail CNC lathe 1. The biggest feature of the inclined rail CNC lathe is to save the floor area of the machine tool. The change of the feed cutting direction from the original horizontal or inclined feed to the top-down turning feed. Such a change reduces the distance between the workpiece and the operator, which not only makes it easier to see the turning situation, but also makes it easier for the operator to load and unload the tool. 2. The inclined rail CNC lathe increases the space for chip removal during workpiece turning, and places the traditional guide rails under and behind the workpiece above the workpiece, making chip removal more smooth and avoiding the accumulation of iron chips. Precautions for the selection of inclined rail CNC lathe 1. Model selection In the processing of boxes, cavities, mold parts, etc., the processing of CNC milling machines and machining centers with the same specifications can meet the requirements, but the prices of these two kinds of machine tools differ a lot, so in the mold processing, only the process of changing tools very frequently will choose to use machining centers, and generally CNC milling machines will be used. 2. CNC system selection When purchasing inclined rail CNC lathes, the same machine tool can be configured with a variety of CNC systems, which can be used for open CNC systems with NC embedded in PC structure or soft structure. The CNC software of this kind of system is completely installed in the computer. The hardware part is only the standardized general interface between the computer and the servo drive and the external 1/0. In addition, in the CNC system, there are many optional functions in addition to the basic functions. Users can follow the requirements of processing workpiece, measurement requirements, programming requirements, etc. in the process of processing, especially the NDC function of real-time transmission, etc. 3. Selection of accuracy The choice of accuracy grade of oblique rail CNC lathe depends on the machining accuracy of typical parts. Generally, the items of accuracy inspection of CNC machine tools include the accuracy of repeated positioning of single axis and the roundness of test pieces processed by more than two axes. The positioning accuracy and repeated positioning accuracy are the comprehensive accuracy of the moving parts of the axis. At present, the software part of our NC system in production has rich error compensation functions, which can stably compensate the system errors of all links on the feed transmission chain. Just like the pitch error and cumulative error of the lead screw, the pitch compensation function can be used to compensate.

Clamping of parts 1. Selection of positioning datum When machining in the machining center, the positioning of parts should still follow the six point positioning principle. At the same time, special attention should be paid to the following points: (1) When multi station machining is carried out, the selection of positioning datum should consider the positioning mode that can complete as many machining contents as possible, even if all surfaces can be machined. For example, for box parts, the combined positioning method of one side and two pins should be adopted as far as possible. (2) When the positioning datum and design datum of a part are difficult to coincide, the assembly drawing should be carefully analyzed to clarify the design function of the design datum of the part. Through the calculation of the dimension chain, the dimensional position accuracy requirements between the positioning datum and design datum should be strictly stipulated to ensure the machining accuracy. (3) The programming origin and the part positioning datum may not coincide, but there must be a definite geometric relationship between them. The selection of programming origin mainly considers the convenience of programming and measurement. 2. Selection of fixtures On the machining center, the task of the fixture is not only to clamp the parts, but also to determine the machining origin of the parts with the positioning datum as the reference datum. Therefore, the positioning datum should be accurate and reliable. 3. Clamping of parts When considering the clamping scheme, it is necessary to ensure reliable clamping and minimize clamping deformation. Tool selection Tools play a vital role in NC machining, so when selecting tools for machining centers, the following basic requirements should be followed: 1. Good cutting performance: it can withstand high-speed cutting and strong cutting and has stable performance. 2. High accuracy: the accuracy of the tool refers to the shape accuracy of the tool and the position accuracy of the tool and the clamping device; 3. Equipped with perfect tool system: meet the requirements of Multi Tool continuous processing. The tool head part of the tool used in the machining center is basically the same as that used in the NC milling machine. The tool handle part of the tool used in the machining center is different from that used in the general NC milling machine. The tool handle used in the machining center is equipped with a clamping groove for the manipulator to clamp. Therefore, when selecting tools, we must follow the product processing requirements of the machining center.

When machining, safety always comes first. Therefore, before processing, it is necessary to review the safety of the machining equipment to ensure the normal operation of the equipment and the personal safety of the operator.  General 1. At the beginning of the use of machining equipment, it is necessary to carry out maintenance planning and viscosity maintenance plan for the equipment. 2. The maintenance plan of machining equipment includes operation and control measures, equipment and facilities isolation and identification contents, which need to be supervised and inspected in the process of inspection and maintenance. 3. The mechanical processing equipment scrapped according to the national regulations shall be stopped from use. 4. For equipment that does not meet the standard requirements, has worked for more than years, has not been determined by technical performance, or has major potential safety hazards. 5. The contents of the daily inspection log of mechanical equipment need to be improved, and special inspection of construction equipment such as construction characteristics, seasonal changes, hazard sources and test piece cycle should be paid special attention. 6. For the leased mechanical processing equipment, check whether the procedures are complete and legal. For the leased equipment, its license, product certificate, safety signs, construction and installation documents and other equipment archives should be checked before use. 7. For large-scale machining equipment, special personnel should be assigned to identify it, and a certain understanding of equipment installation, use, maintenance, removal, etc. is required.  Hoisting machinery 1. Whether the steel wire rope used by lifting machinery has quality certificate, and the requirements for use should be checked. 2. Whether there is deformation between the metal structure and the track, whether the main stressed components, whether the connecting welds have obvious welding defects, and whether the joints of bolts and pins are loose. 3. The flexibility of pulley rotation, whether the protective cover is intact, and whether the pulley diameter matches the diameter of steel wire rope. 4. Check whether the hook and other relevant pick-up devices are intact without cracks, and set effective anti decoupling devices. 5. Whether the safety devices such as brakes and limiters meet the requirements. 6. Whether the distance between moving parts is safe, and the distance between moving parts and buildings, facilities and transmission lines needs to meet the requirements of relevant standards. 7. The driver's cab of the crane shall ensure clear vision, and shall be equipped with fire extinguishers and insulated floors. The signs of each operating device shall be intact and eye-catching; The fixed connection of the cab is firm and reliable.  Hanging basket 1. The special construction scheme shall be prepared for the installation and disassembly of the hanging basket for high-altitude operation. The supporting and hanging mechanism of the hanging basket shall be designed and calculated, and the special construction scheme shall be implemented after approval. 2. After the basket is installed, it needs to be accepted according to the requirements, and the acceptance form should be submitted to the person in charge for signature and confirmation. 3. The basket needs to be checked before and after each use. 4. Before the installation, use and removal of the basket, technical disclosure shall be made to the operators, and written records shall be made. 5. The hanging basket needs to be installed with an anti falling safety lock during use, and it should be sensitive and effective. 6. The basket is equipped with an upper limit device to ensure the sensitivity and reliability of the limit device. In the process of machining, we should pay attention to the safety of machining equipment. This can not only ensure the personal safety of operators, but also be of great help to the use of equipment.

With the development of science and technology, people pay great attention to the manufacturing industry, design, manufacturing level, product quality, cost and production cycle. In the decades since the emergence of CAD and CAM technology, the relationship between computer and machining production has become closer and closer. The technology that leads to the adoption of CAD and cam has become the focus of the current and future technological development of the entire manufacturing industry. Today, let's talk about the software application of CAD and CAM technology. CAD and CAM technology has gone through the era of mainframe, minicomputer, workstation and microcomputer. There are popular cad/cam software at that time in every era. Now, workstation and microcomputer platform cad/cam software has occupied a dominant position, and there have been a number of excellent and popular commercialized software. 1. High grade cad/cam software Representatives of high-end CAM software include Unigraphics, I-DEAS /pro/engineer, CATIA, etc. This kind of software is characterized by superior parametric design, variable design and feature modeling technology combined with traditional solid and surface modeling functions. It has complete processing methods, accurate calculation and strong practicability. It can process extremely complex workpiece surfaces from simple 2-axis processing to 5-axis linkage, and can automatically control and optimize the NC processing process, At the same time, it provides secondary development tools that allow users to expand the functions of UG. It is the preferred cad/cam software in aviation, automobile and shipbuilding industries. 2. Mid range cad/cam software Cimatron is the representative of mid-range cad/cam software. This kind of software has strong practicability, providing a relatively flexible user interface, excellent three-dimensional modeling, engineering drawing, comprehensive NC machining, various general and special data interfaces, and integrated product data management. 3. Relatively independent cam software Relatively independent cam systems include Mastercam, SURFCAM, etc. This kind of software mainly obtains the geometric model of products from other CAD systems through neutral files. The system mainly includes interactive process parameter input module, tool path generation module, tool path editing module, 3D machining dynamic simulation module and post-processing module. It is mainly used in the mold industry of small and medium-sized enterprises. 4. Relatively independent cam software Relatively independent cam systems include Mastercam, SURFCAM, etc. This kind of software mainly obtains the geometric model of products from other CAD systems through neutral files. The system mainly includes interactive process parameter input module, tool path generation module, tool path editing module, 3D machining dynamic simulation module and post-processing module. It is mainly used in the mold industry of small and medium-sized enterprises. In CNC machining, the selection of cad/cam software has a great impact on machining. If the requirements of products are not high, but choose high-end software, it will not only waste resources, but also increase the cost of enterprises; If you choose ordinary software with high product requirements, it will lead to poor product quality. Therefore, operators engaged in NC machining should have a certain understanding and understanding of the classification, characteristics and scope of application of the software, and choose the software reasonably according to the production situation.

 Advantages of obtaining ISO9001 system certification 1. Carrying out ISO9001 system certification means that the machine processing plant is responsible for customers and society, which is very helpful to provide the service reputation of the enterprise and establish a good corporate image. 2. Carrying out ISO9001 system certification gives enterprises a great advantage in the mechanical processing industry to participate in market bidding and bidding competition. 3. ISO9001 system certification is of great help to expand the sales channels and sales volume of products and services, and it can make the machining plant obtain greater profits. 2、 How to apply for ISO9001 system certification （1） To apply for ISO9001 system certification, you need to have the following three certificates: 1. Business license: the business license shall be three months old. 2. Structure organization code certificate 3. Tax registration certificate （2） The work directly related to system certification mainly includes the following: Plan according to the enterprise's own situation and make a system certification work plan; Select the certification authority according to the relevant local information; Negotiate with selected certification bodies and sign certification contracts or agreements; Quality Assurance Manual submitted for approval; Be prepared for the inspection; Accept on-site inspection and feed back information in time; Rectify non-conforming items; Obtain certificates through system certification; Continue to improve the quality system in the daily production process to meet the follow-up inspection.   3、 Benefits of implementing ISO9001 certification system After the certification, machining plants should also adhere to a sound quality certification system in daily production, which is not only responsible for customers, but also bring many benefits to their own enterprises. 1. Establishing a systematic and rigorous management mode is of great help to optimize the organizational structure and improve quality management, and is also conducive to the establishment of a mechanism to reduce and eliminate, especially to prevent product defects. 2. ISO9001 certification system enables machining plants to establish quantifiable quality objectives from the company to all departments, so as to ensure the stability of service quality and the improvement of work efficiency. 3. The ISO9001 certification system makes all production dynamics of the machining plant under control, effectively optimizing and consolidating the business process. 4. The ISO9001 certification system enables the organization to establish an efficient resource management mechanism. In particular, production equipment, archives, data management and maintenance have been standardized. 5. The ISO9001 certification system is not only standardized for production, but also for the human resource management mechanism of address, which makes the mediocrity and training performance of all kinds of personnel in the organization become rules to follow.

As the name suggests, it is not concerned with the mechanism of chip formation, but with the characteristics of the workpiece surface after grinding. When the surface of the workpiece after grinding has the ability to reflect light to a certain extent, the grinding process is called mirror grinding. The workpiece materials of mirror grinding are not limited to brittle materials, but also include metal materials such as steel, aluminum and molybdenum. In order to realize mirror grinding, professors Nakagawa and Ohmori of the Institute of physics and chemistry of the University of Tokyo in Japan invented electrolytic in process dressing (ELID). The basic starting point of mirror grinding is that in order to reach the boundary surface, we must use the smallest possible abrasive particle size, such as particle size 2 μM or even 0.2 μm。 Before the invention of ELID, the particle size grinding wheel was rarely used in industry. The reason is that the particle size grinding wheel is very easy to jam, and the grinding wheel must be trimmed frequently. The auxiliary time of dressing the grinding wheel often exceeds the working time of grinding. ELID solves for the first time the contradiction between dressing and grinding when only using particle size grinding wheel, thus creating conditions for the industrial application of particle size grinding wheel.

1. Machining is a process of changing the overall dimension or performance of a workpiece with a processing machine. 2. According to the temperature state of the workpiece being processed, it is divided into cold processing and hot processing. Generally, it is processed at normal temperature without causing chemical or phase changes of the workpiece, which is called cold processing. 3. Generally, processing above or below normal temperature will cause chemical or phase changes of the workpiece, which is called thermal processing. 4. Cold working can be divided into cutting and pressure machining according to the difference of machining methods. 5. Hot working commonly includes heat treatment, calcination, casting and welding. In addition, cold and heat treatment is often used during assembly. 6. For example, when assembling bearings, the inner ring is often put into liquid nitrogen for cooling to shrink its size, the outer ring is appropriately heated to enlarge its size, and then it is assembled together. The outer ring of the wheel of the train is also sheathed on the substrate by heating, and its firmness can be guaranteed when it is cooled. 7. Mechanical processing includes: filament power winding, laser cutting, heavy processing, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, metal sheet bending forming, die forging, water jet cutting. 8. Machining: generalized machining is the process of manufacturing products by mechanical means; Narrow meaning is the process of making parts with special mechanical equipment such as lathes, milling machines, - drilling machines, grinders, - stamping machines, - die casting machines, etc.