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

How does the tool tip arc affect the turning milling composite processing and how to handle it Turning milling compound machining is a high-tech method for machining hardware parts. It can process various types of materials, including 316 and 304 stainless steel, carbon steel, alloy steel, aluminum alloy, zinc alloy, titanium alloy, copper, iron, plastic, acrylic acid, POM, uhwm and other raw materials, and can be processed into square and round complex structural parts. During the use of CNC lathe, in order to reduce the surface roughness of the workpiece to be processed, slow down tool wear, and improve tool life, the turning tool tip is usually ground into an arc shape, and the arc radius is generally 0.4~1.6mm. CNC lathes (G41, G42) with tool tip radius compensation function are used. As long as the processing program is directly programmed according to the workpiece size, the tool tip arc will not cause processing errors; NC lathes without this function will be affected by the tool tip arc during machining. In serious cases, the workpiece will be scrapped due to out of tolerance The Method of Eliminating Machining Error of CNC Lathe. 1. Change the programming size: adjust the tool tip path during programming, so that the actual machining contour of the arc tool tip is consistent with the ideal contour 2. With the tool point arc center as the tool location, the programming steps are as follows: draw a sketch of the workpiece → draw the arc path of the tool point according to the arc radius r of the tool point and the size of the workpiece → calculate the characteristic point of the arc center path → program. In this process, it is troublesome to draw the center track of the tool tip arc and calculate its characteristic points. If the cutting machine uses the isometric drawing function and point coordinate query function of CAD software to complete this work, it will be very convenient. In addition, when using this method to process, the operator should pay attention to the following two points: 1) Check whether the R value of the tool tip arc radius used is consistent with the R value in the program; 2) In the process of tool setting for turning milling composite processing, the value of R should be considered, that is, if the tool compensation values obtained through tool setting are x (x axis) and y (Z axis), the actual tool compensation values that should be entered are x-2r and y-r.

Processing procedure of non-standard parts in cnc precision processing plant We know that Dongguan CNC precision processing plant has high requirements for the accuracy of non-standard parts. Precision machining has good rigidity, high production precision, accurate tool setting, and can process parts with high precision requirements. Precision parts cannot be processed at one time to complete all the processing contents of all surfaces. The whole processing process of precision parts can be divided into the following stages: (1) Rough machining stage. Most of the machining allowance of each machined surface is removed, and an accurate benchmark is machined. The first consideration is to maximize the productivity. (2) Semi finishing stage. Remove the defects that may appear after rough machining, prepare for the finish machining of the surface. It is required to achieve a certain machining accuracy, ensure the appropriate finish machining allowance, and complete the processing of unnecessary surfaces. (3) Finishing stage. At this stage, large cutting speed, small feed rate and cutting depth are selected to remove the finishing allowance left by the previous process and make the part surface meet the technical requirements of the pattern. (4) Finishing stage. It is mainly used to reduce the surface roughness value or strengthen the machined surface. It is mainly used for high surface roughness requirements (ra ≤ 0.32 μ m) Surface finish. (5) Ultra precision machining stage. Machining accuracy is 0.1-0.01 μ m. Surface roughness value ra ≤ 0.001 μ M is in the processing stage. The main processing methods of Dongguan CNC Precision Processing Factory are: precision cutting, precision mirror grinding, precision grinding and polishing.

Three Key Points of CNC Machining Speed Control CNC precision processing plant is developing towards high speed and high efficiency. This includes speed control of NC machining. In order to make full use of the effective working stroke, it is necessary to accelerate the moving parts to the high speed stroke in a short time, and stop in the high speed stroke. This is why it is necessary to control the speed of CNC machining. 1. Flexible acceleration and deceleration control In the CNC machining of Dongguan, the specific automatic speed regulation function is generally directly realized by the system program. In this way, it is necessary to change the acceleration and deceleration characteristics of the system or modify the NC program through addition and subtraction control, so ordinary users cannot make the NC machine tool have the best acceleration and deceleration performance according to their own needs. Desire. Therefore, the flexible acceleration and deceleration control method proposed by us adopts the database principle, divides the acceleration and deceleration control into two parts: acceleration and deceleration description and implementation, and separates the acceleration and deceleration description from the system program. In the NC system software, a general control channel independent of the acceleration and deceleration database content is designed to independently complete the acceleration and deceleration calculation and trajectory control. 2. Flexible automatic acceleration control Set the acceleration curve, analytical curve and non analytical curve, and store them in the acceleration and deceleration curve library as templates in the form of digital tables. 3. Flexible automatic deceleration control The acceleration control is also stored in the acceleration and deceleration curve library in the form of a digital table as a template. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performance of CNC machine tools. The automatic acceleration and deceleration control based on fixed curve in the traditional Dongguan CNC precision processing plant lacks flexibility. The acceleration and deceleration process is difficult to ensure the coordination with the machine tool performance, and it is difficult to optimize the dynamic characteristics of the machine tool movement.

Factors to be considered in the selection of surface processing methods for cnc machined parts The machining method of workpiece surface in CNC precision machining factory depends on the technical requirements of the machined surface. However, it should be noted that these technical requirements are not necessarily those specified on the part drawing. Sometimes, due to technical reasons, they may be higher than the requirements on the part drawing in some aspects. For example, due to the misalignment of the datum, the machining requirements for some cnc workpiece surfaces have been improved. Or as a precision benchmark, higher processing requirements may be put forward. After defining the technical requirements for each CNC machining part surface, the final machining method that can guarantee the requirements can be selected accordingly, and several working steps and the machining method for each working step can be determined. The processing method selected for CNC processing parts shall meet the requirements of part quality, good processing economy and high production efficiency. For this reason, the following factors should be considered when selecting the processing method: 1. The machining accuracy and surface roughness obtained by any cnc machining method have a considerable range, but only in a very narrow range is economic, and the machining accuracy within this range is economic machining accuracy. Therefore, when selecting the processing method, the corresponding processing method that can obtain economic processing accuracy should be selected. 2. Consider the characteristics of CNC workpiece materials. 3. The structural shape and size of CNC workpiece shall be considered. 4. Consider productivity and economic requirements. High efficiency and advanced technology shall be adopted for mass production. It can even fundamentally change the manufacturing method of the blank, thereby reducing the amount of labor in machining. 5. The existing equipment and technical conditions of Dongguan CNC precision processing plant shall be considered. When choosing the processing method, we should make full use of the existing equipment, tap the potential of the enterprise, and give play to the enthusiasm and creativity of workers. However, it should also be considered to continuously improve the existing processing methods and equipment, adopt new technologies and improve the process level

Production and processing principles of precision parts processing In the process of precision parts processing, there will be many product workpieces that are not produced at one time, and when the product workpieces are produced, they are only a rough model. If the factory becomes a real product, it needs to use some mechanical equipment for precision processing, and carry out precision processing according to different product requirements, and finally become a product with use value. In order to ensure the efficiency of precision machining and the quality of products produced, four principles must be followed in precision machining. 1. First benchmarking: When using mechanical equipment to process products, a datum plane must be determined to provide positioning reference in subsequent production and processing.   2. Division of production and processing stages: When precision machining products, different production and processing levels are required for different product requirements, and the production and processing levels need to be divided. If the precision requirement is not high, then the simple rough machining stage is OK. The construction period of products is becoming more and more strict, and semi finishing and finishing will be carried out later. 3. Face before hole: During precision machining, for product workpieces such as supports, both plane production and machining are required. In order to process the machining hole with small accuracy error, first make the machining plane, and then make it. Machining holes helps reduce errors.

Detection Methods for Precision Parts Processing When machining precision parts, roundness measurement method, two-point method and three-point method can be used for detection. The roundness method is to place the measured part on the worktable of the roundness meter, find the rotation center line, and make the probe of the roundness meter contact with the inner hole of the workpiece and rotate. Based on the sensor, amplifier, filter and measuring power circuit, accurate measurement results are finally displayed. If a specific contour map is output, the inscribed circle template can be used to take the radius difference between two tolerance circles on the same ship as the roundness error of a section. This instrument is applicable to parts with high requirements for measurement accuracy. If the measured profile is an odd edge circle during precision part processing, roundness error cannot be measured by two-point method, but can be measured accurately by three-point method. Support the workpiece to be measured with a V-shaped bracket, and measure the large error caused by one cycle of product workpiece rotation with a micrometer as the roundness error of the section. Common V-shaped intersection angle α 60 degrees, 72 degrees, 90 degrees, 108 degrees and 120 degrees respectively. The three-point method can also be used for high-precision measurement in precision parts processing.

Material requirements for CNC precision parts processing CNC precision parts processing is not suitable for precision processing of all materials. Some materials are too hard and exceed the strength of the processed parts, which may lead to the collapse of equipment parts. Therefore, this material is not suitable for precision machining, except for equipment parts made of special materials or laser cutting. The requirements are specific to each work, because it will also endanger the quality of the produced equipment. Therefore, in order to maintain the quality of equipment, there must be requirements not only for machinery and equipment, but also for the use of employees and some processing equipment. Materials are required. This must have a certain specification. Only in this way can the finished product be the ideal appearance of everyone. Let's know what the requirements of CNC precision parts processing on materials are? CNC precision parts processing materials are divided into metal materials and non-metallic materials; For metal materials, stainless steel has the highest strength, followed by pig iron, copper and aluminum. The processing of porcelain and plastics belongs to the processing of non-metallic materials. For material strength requirements, in some places, the higher the material strength, the better, but only the strength requirements for processing parts. Processing materials should not be too hard; If it is harder than mechanical parts, it is difficult to machine; The material must be of medium hardness and softness. It is at least one level lower than the strength of the part, and also depends on the function of the production equipment and the effective selection of equipment. In the manufacturing process of CNC precision parts, because the manufacturing requirements and standards of each part are different, the manufacturing process plan is also different. When different process options are used to manufacture the same part, the productivity and economic benefits are also different.

Why CNC precision processing plants choose polyhedron processing Features of polyhedron machining center: 1. CNC precision machining plant is equipped with a polyhedron machining center swing head, which can realize the machining of planes and holes at any angle in space. It is applicable to the whole process of automobile, various moulds and large workpieces with complex shapes from powerful cutting to high-precision finishing. 2. The X-axis four track cross slide arrangement enhances the bearing capacity of the workbench, and the special support of the screw rod ensures no overhang. 3. The cross beam adopts reasonable combination of transverse and longitudinal reinforcement and meter shaped reinforcement, which has certain bending and torsion resistance; The three roller linear guides and eight slender sliders on the Y-axis are arranged reasonably. 4. The Z-axis stroke is 1300 or 1500, equipped with 4 roller linear guides and 12 sliders, arranged symmetrically, and the force is reasonable. 5. AHC automatic exchange of the head chamber, using servo motor and high-precision slide rail positioning, independent and stable, does not occupy processing space.   6. The spindle adopts direct connection structure, with high speed, small vibration and large torque. Compact structure, suitable for machining deep cavity parts. 7. Equipped with Heidelberg controller, large color LCD screen, load self adjustment, easy operation. 8. The strong and weak currents of the electric control box are configured separately to prevent interference, increase reliability and maximize the working time. Processing method: Polyhedral machining center mainly adds a fourth rotary shaft on the basis of the original vertical machining center or horizontal machining center. Generally, the rotary axis parallel to the X axis is added on the workbench. The rotation axis is defined as A-axis When machining polyhedral parts, it is required that the machining surface of the polyhedron can be parallel or vertical to the workbench after rotating around the rotation axis A, otherwise, the machining of the machining surface will be incomplete, resulting in undercut or over cutting. happen. Install the machined parts on the A-axis turntable through the fixture, keep the workpiece rotation axis parallel to the A-axis, and correct the reference plane. In the actual processing of Dongguan CNC Precision Processing Factory, the relative position of the processing plane can be obtained by rotating the angle, and all the pixels in the processing plane can be processed completely.

How to maintain common parts of vertical machining center in CNC precision machining plant? As a highly automated processing equipment, the vertical machining center of CNC precision machining plant will have failures of one kind or another when it is used for a long time or handled improperly, so it must be well maintained. 1. Servo motor and spindle motor of vertical machining center Servo motor and control system are the key components of machine tool power source and precision control, focusing on noise and temperature rise. If the noise or temperature rise is too large, find out whether it is a mechanical problem such as bearing or a matching amplifier parameter setting problem, and take corresponding measures to solve it. If the servo shaft makes abnormal noise during movement, it may be the mechanical noise caused by the lead screw, coupling and misalignment with the servo motor. The motor of the vertical machining center can be disconnected from the coupling and run separately. If the motor still has noise, adjust the speed loop gain and position loop gain appropriately to mute the motor. If there is no noise, it is judged that there is a problem with the concentricity of the screw rod and coupling. Recalibrate the concentricity, and then connect the motor, which can generally eliminate the problem.   2. Measurement feedback element of vertical machining center Measuring feedback elements include encoder, grating ruler, etc. It is necessary to check and detect whether the connection of each element is loose and whether it is polluted by oil or dust. Dust and fine iron filings can damage these components. 3. Electrical control part of vertical machining center Frequently check whether the external three-phase power supply voltage connected to the machine tool is normal; Check whether the electrical components are well connected; Display the diagnostic screen with CRT and check whether various switches are effective; Check whether the relay and contactor work normally and whether the contact is good; Whether protective elements such as thermal relay and arc extinguisher are effective; Check whether the element temperature in the electric cabinet of the vertical machining center is too high. For poor contact of the contactor, the contactor can be disassembled, the high-temperature oxide on the surface of the contactor can be removed with a small file, and then the impurities can be wiped off with absorbent cotton and alcohol, reassembled, and the contact can be checked with a multimeter. Continuity test.   4. NC system control part of vertical machining center The control system includes numerical control unit, power module, I/O interface, servo amplifier, spindle amplifier, operation panel, display, etc. The maintenance is mainly to check whether the relevant voltage value is within the CNC specified range of Dongguan CNC Precision Processing Factory; Whether the connection of electrical components is loose; Check whether the fans of each functional module operate normally, and remove the dust on the fan and dust screen.

What are the characteristics of precision parts processing Advantages of precision parts machining center: 1. Reduce processing time and improve processing accuracy. The biggest feature of the precision parts machining center is that it can process all five surfaces at one time. This is called machining angle avoidance. If it is a linkage machine tool, the C-axis can rotate freely, and the A-axis can rotate about 130 degrees. These equipment features allow interference free machining. The advantage of this is that the processing can be completed in one clamping, which avoids repeated positioning errors caused by multiple clamping. At the same time, one-time clamping also saves a lot of time and improves work efficiency. It can reduce the time from product to delivery and reduce inventory. Precision parts processing: 2. Reduce equipment investment cost, workshop area and number of workshops. The left and right compound machining machines of precision parts machining centers usually have a trolley function, which can be included from even number lathes to milling machines to vertical grinders. Everyone knows that the price of vertical mill equipment is very expensive. Through the calculation of cost and processing cycle, it can be found that the five axis is more cost-effective. In the past, our production and processing may be mainly divided into engineering. The problem with this mode of production is that there are many waiting times that cannot be eliminated. However, the engineering intensive production represented by the five axis compound processing equipment only needs to wait for the debugging time in the early stage, while with the popularization of various domestic complete machine simulation software, the programming only needs to import blank data. The preparatory work has been greatly shortened. Therefore, foreign auto parts and high-end manufacturing are basically based on five axles.