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

1、Determine the processing method of each surface. On the basis of understanding the characteristics of various processing methods and mastering their processing economic accuracy and surface roughness, choose the processing method to ensure processing quality, productivity and economy.   2、Choose the positioning reference. According to the principle of rough and fine datum selection, reasonably select the positioning datum of each process. 3, the development of the process route. On the basis of the analysis of the part, divide the part rough, semi-finish, finishing stages, and determine the degree of concentration and dispersion of the process, reasonable arrangement of the processing order of the surface, so as to develop the machining process route of the part. For the more complex parts, you can first consider several options, analysis and comparison, and then choose a more reasonable processing program.   4, determine the machining allowance of each process and process dimensions and their tolerances.   5, the choice of machine tools and tools, clamps, measurement, cutting tools. The choice of machinery and equipment should not only ensure the quality of processing, but also to economic and reasonable. In batch production conditions, generally should use general-purpose machine tools and special fixtures. 6, to determine the technical requirements of the main processes and inspection methods.   7, to determine the cutting amount and time quota for each process. Single piece of small batch production plant, cutting amount more by the operator's own decision, machining process cards are generally not clearly specified. In the batch, especially in the mass production plant, in order to ensure the rationality of production and the rhythm of the balance, it is required to specify the cutting amount, and not arbitrarily altered.   8, fill in the process documentation.

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.

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. Translated with www.DeepL.com/Translator (free version)

How to Milling Noncircular Gears in Precision Parts Processing When the polar axis of pitch curve of non-circular gear is not a tooth groove but a tooth peak during precision parts processing, the included angle between the polar axis and the radial diameter of point A of the initial processing tooth groove shall be considered during adjustment calculation, which is equal to the angle corresponding to the arc length from the polar axis to the half pitch (π m/2) of the adjacent tooth groove. When selecting the number of milling cutter, the close circle radius (radius of curvature) of the midpoint of the arc length of the tooth groove to be cut on the pitch curve shall be obtained first, and then the number of teeth of the equivalent cylindrical gear of each tooth groove shall be calculated according to the module m of the gear to select the cutter number of the modular milling cutter. If the accuracy requirement is not high, the number of milling cutter can be selected according to the equivalent gear teeth with the largest curvature radius. In order to facilitate tool setting during precision parts processing, the machining shall be started from the 0 end of the long sleeve with grooves. After alignment, the machining can be carried out without rotation. After milling the tooth groove on the first section of arc by angle A1 around the rotation center O1, turn the angle A2, and then move the rotation center to the second section of arc center O2. Turn the angle A3 to mill the first gear groove 3 on the second arc, and then mill all the gear grooves on the second arc according to the angle A4. Milling out all the grooves in the same operation sequence as above.

Two minutes to let you know what a turning milling compound machining machine is Turning milling compound processing machine tool refers to the machine tool that can complete turning milling compound processing, which can be used as both lathe and milling machine. The turning milling compound machine was originally used to process propeller, mainly to avoid the loss of precision and benchmark caused by twice clamping! In addition to the function of CNC lathe, it can also complete plane milling, drilling, tapping, straight groove, spiral groove, and gear milling. It has the compound functions of turning, milling and boring, and can realize the processing concept of one-time clamping and one-time completion. Generally, CNC turning milling combination has the following two characteristics: 1. The spindle motor adopts servo motor, and the spindle rotation movement and feed movement can be linked. 2. In addition to turret tool rest, the CNC lathe shall at least be equipped with electric tool rest or independent electric tool rest. Compared with ordinary turning, turning milling compound has the following advantages: it can install a variety of special tools, new tool layout, reduce tool change time, improve processing efficiency, and realize the clamping of all or most of the processing procedures at one time, thus greatly shortening the product manufacturing process chain. In this way, on the one hand, the auxiliary production time caused by replacing the installation card is reduced, and the manufacturing cycle and waiting time of the fixture are reduced, which can significantly improve the production efficiency. Reduce the number of card installations to avoid error accumulation caused by positioning reference conversion. At the same time, most of the current turning milling compound processing equipment has the online detection function, which can realize the in-situ detection and accuracy control of key data in the manufacturing process, thus improving the processing accuracy of the workpiece. Products; High strength integrated bed design improves the gravity processing ability of difficult to cut materials. When turning and milling in Dongguan, the tool can cut intermittently, which can short the workpiece formed of any material, and is easy to automatically discharge chips. And chip breaking and chip breaking cutting can give the tool enough cooling time, reduce the thermal deformation of the workpiece, and increase the service life of the tool. Compared with traditional CNC machine tools, turning and milling machining has higher speed, better cutting product quality, lower cutting force, improve the accuracy of thin-walled bars and slender bars, and form high-quality workpieces. Because cutting speed can be divided into workpiece speed and tool speed, according to mechanical characteristics, increasing tool speed and reducing tool speed can achieve the same processing effect. This function is particularly effective for rough machining of large forgings, because the reduction of forging speed can eliminate the vibration caused by workpiece eccentricity or periodic change of radial cutting force, so as to ensure smooth cutting of workpiece and reduce the error in workpiece processing. When the workpiece is processed on the CNC turning milling compound machine tool, the low speed of the workpiece can effectively reduce the centrifugal force of the workpiece, avoid the deformation of the workpiece, and improve the machining accuracy of the part. In turn milling, using large longitudinal feed can also obtain accurate cutting, and the surface roughness can be effectively guaranteed. The turning milling compound machine tool can process workpieces by turning, milling, drilling, boring and other different methods. Workpieces can also be clamped to complete the multi surface processing task at one time to ensure the turning milling compound processing accuracy in Dongguan.

Temperature is also an important factor for turning milling machine tools The turning milling compound processing machine tool should be far away from the vibration source, avoid direct sunlight and thermal radiation, and avoid being affected by moisture and airflow. If there are vibration sources near the turning milling compound CNC lathe, anti vibration grooves shall be set around the machining center. Otherwise, it will directly affect the machining accuracy and stability of the turning milling composite CNC lathe, lead to poor contact of electronic components, cause failures, and affect the reliability of the turning milling composite CNC lathe. The ambient temperature of turning milling CNC lathe is lower than 30 ℃, and the relative temperature is lower than 80%. In general, the exhaust fan or air cooler is installed inside the numerical control electric cabinet to keep the working temperature of electronic components, especially the central processor, constant or the temperature difference changes little. Excessive temperature and humidity will reduce the life of control system components and cause more failures. The increase of temperature and humidity and the increase of dust will cause adhesion on the integrated circuit board and cause short circuit. Generally, the machining center is installed in the machining workshop. Not only does the environment temperature change greatly and the service conditions are poor, but also there are many electromechanical equipment, causing large fluctuations in the power grid. Therefore, the installation position of the machining center needs to strictly control the power supply voltage. The power supply voltage fluctuation must be within the allowable range and kept relatively stable. Otherwise, the normal operation of the CNC system of the machining center will be affected. The difference between the implementation of turning milling composite processing technology and conventional processing equipment is that the turning milling composite processing center is actually equivalent to the processing of a production line. Therefore, how to formulate a reasonable process route, installation method and select a reasonable tool according to the process characteristics of parts and the process characteristics of turning milling composite processing is the key to achieve efficient precision machining. The development of turning milling compound machining technology puts forward higher requirements for the development of nc programming technology. Because the application time of turning milling composite processing in actual production is relatively short, in the absence of professional composite processing solutions, a common way is to use general CAM software to plan part of the processing programs, and then the technicians manually integrate the programs to meet the requirements of Dongguan turning milling composite processing machine tools for processing programs.

What are the characteristics of the four basic motion modes of turning milling machine tool Turning milling compound machine tools are the main types of compound machine tools. Generally, plane milling, drilling and tapping, slot milling and other milling processes are realized on the CNC lathe. It has the compound functions of turning, milling and boring. It can realize the processing concept of one-time clamping and full closing. It uses the compound movement of milling cutter rotation and workpiece rotation to realize the cutting of workpiece, so as to ensure the shape accuracy, position accuracy and machining surface integrity of workpiece. Turning milling combined machining is not simply a combination of turning and milling on one machine tool, but a combination of turning and milling to complete various surface machining, which is produced under the conditions of greater development of NC technology today A new cutting theory and technology. The movement of turning milling compound machining machine tool includes four basic movements: milling cutter rotation, workpiece rotation, milling cutter axial feed and radial feed. According to the relative position of the workpiece rotation axis and the tool rotation axis, the turning milling composite processing can be divided into axial turning milling processing, orthogonal turning milling processing and general turning milling processing. Among them, axial turning milling and orthogonal turning milling are the two most widely used turning milling machining methods. Because the axis of rotation of the milling cutter is parallel to the workpiece, it can not only process the cylindrical surface, but also the inner hole surface. Since the rotation axis of the milling cutter is perpendicular to the workpiece, the inner hole cannot be machined when the diameter of the inner hole is small. However, when machining the outer cylindrical surface, the longitudinal travel cutter for milling is not limited, and large longitudinal feed can be used. Therefore, Dongguan turning milling composite processing is more efficient when machining the outer cylindrical surface.

What are the development types of milling machine in precision parts processing There are many basic types of milling machines developed in precision parts processing. With the further optimization and improvement of milling machine functions, its structure layout is more reasonable. The lifting table milling machine, bed milling machine and gantry milling machine have become the three mainstream basic types of future development. The common type lifting table milling machine is suitable for the production of single small batch, medium and small parts. The rigidity of the lathe bed milling machine is better than that of the lifting table, and the processing precision is also higher, which is suitable for processing larger parts. Gantry milling machine is suitable for machining plane and inclined plane of large and heavy parts. CNC or profiling gantry milling machine can machine curved surface. If equipped with ram type milling head, boring can be carried out. On the basis of the basic types of milling machines, the derived types of milling machines are not available for production in order to adapt to different processing objects and different production scales, such as rocker milling machines, ram milling machines, specialized milling machines and special milling machines. Some have also formed independent series. The application of numerical control technology in precision parts processing expands the processing range of the milling machine and improves the automation degree of the milling machine. Digital display milling machine is also one of the derivative types of milling machine. The application of digital display technology to display the spindle speed, worktable feed speed and displacement makes the operation of ordinary milling machine more convenient and intuitive.

What is the use method of flat jaw vice in precision parts processing Pneumatic or hydraulic vises shall be generally used in mass production of precision parts processing. Pneumatic or hydraulic vises shall be used. The structure and adjustment method of vises shall be familiar with. For example, hydraulic vises can be used to effectively reduce labor intensity, stabilize clamping force and absorb certain vibration during milling for workpieces with large impact force and heavy dead weight in mass production. According to the drawings and instructions, the structural principle of the hydraulic vise is analyzed as follows: during the clamping operation, pull the handle to the clamping position, the pressure oil enters the oil chamber above the piston 2 through the control valve 1, pushes the piston 2 to move downward, and drives the piston rod 3 connected to it to move. After the piston rod pushes the sliding block 4 with the chute to move, under the action of the chute and the roller 6, pull the movable jaw seat 5 to the left to clamp the workpiece. After the end of the milling stage in the process of precision parts processing, pull the handle to the released position, the piston returns, and the jaw is released. When processing another batch of workpieces, if the distance between the two jaws needs to be adjusted due to the change of workpiece size, loosen the nut on the upper end of the T-shaped column shaft in the middle of the roller seat 7, so that the teeth on the roller end face are separated from the teeth on the movable jaw seat, and then the position of the movable jaw can be adjusted.

Common Mechanical Trouble Shooting in Precision Parts Processing In the process of precision parts processing, except for a few self diagnosis functions that can display faults, most of the faults can not determine the specific cause. We have listed several common troubleshooting for reference. As rolling friction pairs are widely used in the guide rail, most of the feed transmission failures are caused by the decline of motion quality, such as mechanical components not reaching the specified position, motion interruption, decline in positioning accuracy, excessive reverse clearance, etc. In case of similar failures, adjust the preload of each motion pair, adjust the loose link, improve the motion accuracy and adjust the compensation link. The machine tool returns to zero fault. When the machine tool returns to the reference point, an over length alarm occurs, and there is no decrement action. This kind of fault generally refers to that the minus signal is not input to the CNC system, and the limit stop and signal line can be checked generally. Automatic tool change device failure. Such failures are common. The failures are shown as: tool magazine movement failure, excessive positioning error, tool change action not in place, tool change action detent, and the whole machine stops working. Such failures can generally be eliminated by detecting the cylinder pressure, adjusting the position of each limit switch, detecting the feedback signal line, and adjusting the machine tool parameters related to tool change action. In the process of precision parts processing, the machine tool cannot move or the processing accuracy is poor, which are some comprehensive faults. When such faults occur, they can be eliminated by readjusting and changing the clearance compensation, detecting whether there is creeping in the shaft feeding, and other methods.