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

Machining methods for non-standard precision mechanical parts.   Non-standard precision parts processing requirements for precision is extremely high, to achieve ultra-lubricated processing appearance and very high machining accuracy, that naturally the tool by a very high demand, if the tool wear, then the processing surface quality will be reduced. And in the ultra-precision cutting, and general cutting rules are not the same, the cutting speed is not subject to the standard life of the tool constraints. Non-standard precision parts processing generally choose the smallest speed, which is based on the ultra-precision machine tool transmission characteristics and cutting characteristics, because the minimum speed can make the appearance of the smallest roughness, thus ensuring the highest quality of processing - high. Of course, the premise is to ensure the quality of the machine tool can drive high cutting speed to ensure the efficiency of processing. Non-standard precision parts processing should be based on the cutting tool, cutting speed, depth of cut and feed rate parameters such as selection, according to past experience we know, in the processing of plastic materials, if the selection of a larger front angle of the tool can be useful to press the composition of the chip tumor, which is the tool front angle increases, the cutting force is reduced, cutting deformation is small, the tool and chip contact length becomes shorter, reducing the basis of the chip tumor. Ltd. is a professional manufacturer of metal non-standard parts, ￠ 0.5 - ￠ 20mm stainless steel, titanium, aluminum and other metal precision parts manufacturing has many years of technical precipitation.

CNC machines consist of programs, input/output devices, CNC units, servo systems, position feedback systems, and machine bodies. (1) CNC unit   CNC unit is the core of CNC machine tools, CNC unit consists of information input, processing and output of three parts.   CNC unit accepts digital information, after the control software and logic circuit of the CNC device for decoding, interpolation, logic processing, will be a variety of instruction information output to the servo system, the servo system to drive the executive parts for the feed movement.   Others are the main moving parts of the variable speed, reversing and start-stop signal; selection and exchange of tools tool command signal, cooling, lubrication start-stop, workpiece and machine parts loosening, clamping, indexing table rotation and other auxiliary command signal.   (2) Servo system   By the driver, drive motor, and with the machine tool on the implementation of the components and mechanical drive components of the CNC machine tool feed system. Its role is to convert the pulse signal from the CNC device into the movement of the moving parts of the machine tool. For stepper motors, each pulse signal makes the motor turn an angle, which in turn drives the machine tool moving parts to move a small distance. Each feed motion of the executive components have the corresponding servo drive system, the performance of the entire machine depends mainly on the servo system. (3) Position feedback system   Servo motor feedback of the angular displacement, CNC machine tool actuator (table) displacement feedback. Including grating, rotary encoder, laser rangefinder, magnetic scale, etc.   Feedback device to detect the results into electrical signals back to the CNC device, through comparison, calculate the deviation between the actual position and the command position, and issue deviation instructions to control the feed movement of the executive components.   (4) mechanical components of the machine tool   For the machining center class of CNC machine tools, and storage tool magazine, tool exchange robot and other components, CNC machine tool mechanical components and ordinary machine tools are similar, but the transmission structure requirements are more simple, in terms of accuracy, rigidity, vibration resistance and other requirements, and its transmission and speed change system is more convenient to achieve automation expansion.

The operation of machinery and equipment is simple and complex. Simple because the pre-programmed compiled and executed, complex because the need for professional rigorous operation, mechanical equipment testing and maintenance is also the same. The following to introduce you to the general knowledge of mechanical equipment testing and maintenance. 1、Through the training of employees, make them familiar with the basic operation techniques of equipment maintenance and equipment use to avoid equipment failure or damage caused by improper operation;   2、Training specialized technical personnel, familiar with the construction of equipment and fault diagnosis, troubleshooting and overhaul techniques;   3, collect and summarize the experience of equipment management to improve the efficiency of the use and management of equipment. For preventive equipment overhaul and maintenance, the purpose is to minimize the cost of equipment maintenance to maximize the utility of the equipment, so it is essentially a matter of choosing the best maintenance cost and benefit-price ratio. This is both a management problem and an optimization problem. This problem is more concentrated in the maintenance and maintenance schedule of the equipment.   In the process of using the equipment, it is affected by the temperature and humidity of the working environment, the continuous running time, the service life of the equipment, the material of the equipment, etc. This requires the maintenance personnel to analyze the health condition of the equipment operation through the situation reflected in the actual use of machinery and equipment, so as to make a reasonable schedule of daily maintenance and downtime repair of the equipment in due time. The effect of this should be firstly to avoid unnecessary downtime, and secondly to achieve the daily maintenance of the equipment without affecting the normal operation of the equipment as far as possible, and to deal with the abnormal conditions found in time.

Precision parts processing is a complex and rigorous process, is a combination of each step of the processing process, so what are the specific points of the production of precision parts processing? The following to introduce you to. The production process of the machine is the whole process of making the product from raw materials (or semi-finished products). For the production of machines including the transport and preservation of raw materials, production preparation, the manufacture of blanks, parts processing and heat treatment, product assembly, and commissioning, painting and packaging. Modern enterprises use the principles and methods of system engineering to organize and guide production, and view the production process as a production system with inputs and outputs.   In the production process, any process that changes the shape, size, location and nature of the production object to make it a finished or semi-finished product is called a process. It is the main part of the production process. Processes can be divided into casting, forging, stamping, welding, machining, assembly and other processes, machinery manufacturing process generally refers to the sum of the mechanical processing process of parts and machine assembly process, other processes are called auxiliary processes, such as transportation, storage, power supply, equipment maintenance, etc.. Processes are composed of one or several sequential processes, a process consists of a number of work steps. Precision parts machining process process is the basic unit of the composition of the machining process. The so-called process refers to a (or a group of) workers, in a machine tool (or a workplace), on the same workpiece (or at the same time on several workpieces) by the continuous completion of that part of the process. The main characteristic of a process is not to change the processing object, equipment and operator, and the content of the process is completed continuously.

CNC lathe machining is a small part of machining, so what forms of machining are there in CNC lathe machining? One: Turning tool fixation, mainly for machining unformed workpieces in rotation.   The second is: workpiece fixation, through the high-speed rotation of the workpiece, the turning tool's horizontal and vertical movement for precision machining. In the lathe also available drill, reaming drill, reamer, tap, plate and knurling tool for corresponding processing. Lathe is mainly used for processing shafts, discs, sleeves and other workpieces with rotary surfaces, is the most widely used in machinery manufacturing and repair factories in a class of machine tool processing. The reason why CNC machining should have a wide range is that it has great advantages compared to ordinary lathe machining.   1, CNC lathe processing accuracy is high, high stability, so it can ensure the high quality of processing.   2, a high degree of automation, CNC machining is executed by program decoding, which largely reduces the intensity of manual repetitive work.   3, CNC lathe processing parts change, only need to change the CNC program, which greatly reduces the production preparation time.   4、Multi-coordinate linkage can be carried out, which can process parts with complex shapes.   5, CNC lathe for the operator's quality requirements are also high.

CNC machining center in the process of high-speed machining, to maintain the smoothness of the load throughout the cutting process, to avoid sudden changes in direction, and also to avoid sudden changes in direction when reducing the amount of feed or tool stop. So what strategies should be followed during CNC machining? When the tool path is determined, the CNC machining center should be dominated by smooth milling during high-speed machining to reduce tool wear and improve machining accuracy. According to the principle of shallow cutting and small layer depth of layering, a reasonable layering route is used to achieve the rationality of machining and smoothness of load. In the corner should increase the circular arc walking tool, to prevent the corner speed vector direction of the sudden change, to avoid sharp changes in the tool load.   In the CNC machining center plane two-way cutting processing, can be in the adjacent two rows of tool trajectory between the additional arc transfer, in order to form a smooth lateral shift. In the space two-way cutting processing, you can use the space arc transfer, space inside the arc transfer, space outside the arc transfer and "golf" type transition transfer and other forms of extended transition, which not only ensures the smoothness of the tool trajectory, but also effectively avoid the phenomenon of turning hard bend between the two lines, this transfer method is commonly used in a variety of Curved surface high-speed milling. In order to avoid the CNC machining center in the shape of the contour of the normal direct feed and retreat, should be used spiral, arc and diagonal way into and out of the tool, to ensure smooth into and out of the tool, the steep wall surface and non-steep wall surface finishing, in order to prevent sharp changes in cutting load, CNC machining center to apply different methods of steep wall surface and non-steep wall surface separate processing, can improve the cutting speed, while making the roughness of the surface of the part uniform.

The unique tool magazine of CNC machining center can realize the function of automatic tool change and spindle orientation. Compared with the general machine tool cost is higher, of course, the processing accuracy and efficiency is also higher. So to choose the right machining center, so as to ensure that the CNC machining center to play the most - the greatest benefit. So for companies to choose the machining center model is also to be quite careful, so what specifically to pay attention to? First, the selection procedure should be reasonable, the premise is to have a comprehensive understanding of the processing center - center, including its performance, characteristics, type, the main parameters applicable range, etc. Only on the basis of a full understanding of the following procedures can be launched.   Second, choose the right type. When choosing the type of CNC machining process, processing objects, scope, price and other factors should be taken into account. For example, single-sided processing of workpieces, such as a variety of plate parts, etc., should choose vertical machining work - center; more than two sides of the workpiece or in the surrounding radially radiating row of holes, surface processing, should choose horizontal machining; complex surface processing, such as the guide wheel, the engine on the whole impeller, etc., you can choose five-axis machining center; for the workpiece of high precision requirements, the use of bedroom machining center - center. When processing larger size workpiece, such as machine bed, column, etc., you can choose gantry type machining center. Of course the above methods are only as a reference, the final decision should be made under the conditions of process requirements and financial balance.

Turning threads is one of the most common processes for turning parts, so this article is an example of a common fault and solution for turning threads. When turning threads, there are various reasons for problems in the movement between the spindle and the tool, which may cause a fault when turning threads and affect normal production, and should be resolved in a timely manner. The following is a list of common failures and solutions. 1、Rough surface of thread   Failure analysis: The main reason for this problem is that the cutting edge of the turning tool is not smooth enough, the cutting fluid and cutting speed do not match the processed material, or the vibration generated during the cutting process.   Solution: Fine study the tool with oil or grinding wheel, choose the matching cutting fluid and cutting speed, adjust the position of various parts, and ensure the accuracy of each guide gap, so as to prevent the vibration generated during cutting.   2、Gnawing tool   Failure analysis: mainly due to the incorrect location of the turning tool installation, either too high or too low, and the workpiece clamping is not solid, the turning tool wear is too large   Solution: adjust the height of the turning tool, so that the tool tip and the axis of the workpiece is equal to the height   3、Random buckle   Failure analysis: The reason is that when the screw rotates for a week, the workpiece is not installed over the whole number of turns and caused. Solution.   (1) When the ratio of lathe screw pitch and workpiece pitch is not an integer number, if the bed saddle is swung to the starting position by opening the opening and closing nut when the tool is retired, then when the opening and closing nut is closed again, the turning tool tip will not be in the spiral groove turned out by the previous tool, resulting in a messy buckle. The solution is to use the positive and negative turning method to return the tool, that is, at the end of the first stroke, do not lift the opening and closing nut, the tool along the radial exit, the spindle will be reversed, so that the turning tool along the longitudinal return, and then the second stroke, so that the reciprocating process, because the transmission between the spindle, screw and tool holder has not been separated, the turning tool is always in the original spiral groove, there will be no messy buckle.   (2) For threads where the ratio of the screw pitch to the workpiece pitch of the turning lathe is an integer number of times, the workpiece and the screw are rotating, and after lifting the opening and closing nut, at least wait for the screw to turn one turn before closing the opening and closing nut again, so that when the screw turns one turn, the workpiece turns an integer number of times, and the turning tool can enter the spiral groove turned out by the previous tool, so that there is no messy buckling. This way, the tool can be manually retired by opening the opening and closing nuts. This is a fast retreat, which is conducive to improving productivity and maintaining the accuracy of the screw, while the screw is also safer. 4、Pitch is not correct   Failure analysis and solutions.   (1) Improperly matched hanging wheel or incorrect feed box handle position, resulting in incorrect thread length, can re-check the feed box handle position or check the hanging wheel.   (2) The local incorrectness is due to the local error of the pitch of the lathe screw itself, so the screw can be replaced or partially repaired.   5、The middle warp is not correct   Failure analysis: The reason is that the eating tool is too big and the dial is not allowed, and it is not measured in time.   Solution: Check in detail whether the dial is loose when finishing, the finishing margin should be appropriate, the cutting edge of the turning tool should be sharp, and the measurement should be made in time.

For precision parts, the processing is very strict, the processing process has a tool in, tool out, etc.. There are specific requirements for size and precision, such as 1mm plus or minus how many microns, etc. If the size is wrong too much will become scrap, which is equivalent to having to re-process, time-consuming and laborious, and sometimes even makes the entire processing material scrap, which causes an increase in costs, and at the same time, the parts are definitely not available. So precision parts processing in the end to follow what standards and requirements? For precision parts processing is mainly dimensional requirements, such as how much the cylindrical diameter, there are strict requirements, positive and negative error within the specified requirements to be qualified parts, otherwise they are unqualified parts; length, width and height also have specific strict requirements, positive and negative error is also specified, such as an embedded cylinder (take the most simple basic parts for example), if the diameter is too large, more than the error allowed range, it will Caused by, insert not into the situation, if the actual diameter is too small, more than the lower limit of the negative value of the error allowed, it will cause inserted too loose, not solid problems occur. These are unqualified products, or the cylindrical length is too long or too short, beyond the error tolerance range, are unqualified products, are to be scrapped, or re-processed, which will inevitably cause an increase in costs.   Precision parts processing requirements is in fact the main size problem, must be strictly in accordance with another plus drawings for processing, processing out of the actual size will certainly not be the same as the theoretical size of the drawings, only, as long as the processing size within the error tolerance is qualified parts, so the requirements of precision parts processing is in strict accordance with the theoretical size for processing. Second is the advanced precision parts processing equipment and testing equipment, advanced processing equipment makes processing precision parts easier, higher precision, better results. Testing equipment can detect the parts that do not meet the requirements, so that all the products sent to customers really meet the requirements.

Hardware processing accounts for a large part of precision parts processing. Casting properties: refers to whether the metal or alloy is suitable for casting some process properties, mainly including flow properties, the ability to fill the casting mold; shrinkage, the ability of volume shrinkage when the casting solidifies; deviation refers to chemical composition unevenness.   Welding performance: refers to the metal material by heating or heating and pressurized welding method, two or more metal materials welded together, the interface can meet the characteristics of the purpose of use.   Top gas section performance: refers to the performance of the metal material can be granted top forging without rupture. Cold bending performance: refers to the metal material at room temperature can withstand bending without rupture performance. Bending degree is generally used to bend the angle α (outer angle) or bending center diameter d to the material thickness a ratio, a the greater or d / a smaller, the better the cold bending of the material.   Stamping performance: the ability of metal materials to withstand stamping deformation processing without rupture. Stamping at room temperature is called cold stamping. The test method is to test by cupping test.   Forging performance: the ability of the metal material to withstand plastic deformation without rupture during forging processing.