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

Point control CNC machine tool

The characteristic of point control CNC machine tool is that the moving parts of the machine tool can only realize the accurate positioning from one position to another, and no processing procedure is carried out in the process of motion and positioning. The CNC system only needs to control the coordinate values of the starting point and the end point of the stroke, but does not control the motion trajectory of the moving parts, because the motion trajectory does not affect the final positioning accuracy. Therefore, the motion between several coordinate axes controlled by the point does not need to maintain any connection. In order to reduce the movement and positioning time of moving parts as much as possible and ensure stable positioning accuracy, usually move quickly to the end coordinate, and then move accurately to the end position at low speed. The most typical point control CNC machine tools include CNC drilling machine, CNC coordinate boring machine, CNC spot welding machine and CNC pipe bending machine. Using CNC drilling and boring machine to process parts can save a lot of the cost of drilling template and achieve high hole spacing accuracy.

2022

07/22

Two dimensional contour control CNC machine tool

The characteristic of two-dimensional contour control is that the moving parts of the machine tool should not only realize the accurate movement and positioning from one coordinate position to another coordinate position, but also realize the linear feed motion parallel to the coordinate axis or control the oblique feed motion of two coordinate axes. Using two-dimensional contour control on the CNC machine tool can expand the process range of the boring machine, mill the plane and steps of the prismatic workpiece in one installation, and then carry out point control drilling, boring and other processing, which effectively improves the machining accuracy and production rate. Two dimensional contour control can also be applied to CNC lathes for machining stepped shafts or disk parts.

2022

07/22

Stretch rotation scanning feature of CNC Milling

The stretch feature of CNC milling is a modeling method that extends a section along the direction perpendicular to the section to form a solid. The stretch feature is also the most commonly used feature modeling method. Select the stretch button in the basic feature toolbar. The shape shown in Figure 6.9 and figure 6.10 is a model designed by using the stretch command. Rotation of CNC Milling: Rotating feature is a modeling method to generate a solid by rotating a sketch section around a centerline. The rotation button in the toolbar is. Rotating features are used to generate rotating parts, such as rotating shafts, gears, etc. The step shaft shown in Figure 6.11 is a model designed by using rotating life. Scanning of CNC Milling: Scanning feature is a modeling method to generate solid by extending sketch section along trajectory curve. By selecting the scanning command, the scanning features can be divided into constant profile scanning and variable profile scanning. The scanning feature modeling method in the form of constant section is a relatively simple scanning method, whose sketch is cut while the shape remains unchanged. The scanning method and generation method of the sketch section are controlled by the scanning trace line of the variable section scanning feature Set the geometric relationship between the sketch object and the scanning track in the sketch section drawing project In this way, the sketch section is scanned along the origin track. Maintain the geometric relationship with other tracks, so as to generate a solid model with variable shape.

2022

07/22

Safety operation procedures and daily maintenance of CNC milling machine

(1) Before work, they must wear labor protection products. Female workers must wear work hats and hair nets. Scarves and high heels are not allowed. During operation, they must not wear gloves, smoke, chat with others, concentrate, and play and play in the workshop. (2) Before spending the machine tool, you must check whether the lubrication and protective devices of all parts of the machine tool meet the requirements. (3) Reasonably select cutting tools and fixtures. When clamping precision workpieces or thin and soft workpieces, the clamping method should be appropriate, and the force should be appropriate to ensure that the clamping is firm and reliable. It is not allowed to knock hard, and it can be gently knocked with a wooden hammer or a cushion. (4) During the operation, observe whether there are guns in the workpiece clamping at any time. If there are guns, immediately turn the vehicle to prevent hitting people. When observing the workpiece during the operation, stand in an appropriate position. (5) When the machine tool moves rapidly, pay attention to the surrounding conditions to prevent collision. (6) In case of abnormal heating of the motor of the numerical control machine tool and abnormal sound, stop the machine immediately. (7) The operation should be civilized. Do not put tools, measuring tools and workpieces on the abnormal track of the machine tool and the workbench at will. When the machine tool is running, do not touch the rotating parts, and do not lean your body against the machine tool. It is not allowed to transfer objects from above the machine tool parts. (8) Observe the process regulations, and do not arbitrarily modify the set parameters and operating procedures of the manufacturer in the CNC system. (9) After the operation, control the machine tool, clean the work site and disconnect the power supply.  

2022

07/22

Steps of preparing process specification for lathe

The steps of the process specification are roughly as follows: 1. Read product assembly drawings and parts drawings, understand the use, performance and working conditions of products, and be familiar with the position and function of parts in products. Carry out technological analysis on the structure of relevant parts of the lathe, including usability and manufacturing feasibility, find out the key technologies and operation difficulties of lathe parts manufacturing, and determine the solutions. 2. Determine the blank type and processing method, and draw the blank drawing if necessary. 3. Proposed process route. 4. Determine the machining allowance, process dimension and manufacturing tolerance of each process of the lathe. 5. Determine the equipment, cutting tools, fixtures, measuring tools and auxiliary tools used in each process, and put forward the design and manufacturing instructions for the special equipment that needs to be designed or modified for the lathe. 6. Select lathe cutting quantity and calculate man hour quota. 7. Determine the technical requirements and inspection methods of each main process of the lathe 8. Carry out the technical and economic analysis of the lathe and select the best scheme. 9. Prepare process documents.

2022

07/22

Influence on wear resistance of machine tool parts

The wear resistance of machine tool parts is mainly related to the material, heat treatment and lubrication conditions of the parts themselves. After these conditions are determined, it also depends on the surface quality of parts to a certain extent. Because there are peaks and valleys on the machined part surface, the mating surfaces only contact at the top of some peaks, and the actual contact area is far smaller than the theoretical contact area. Therefore, when machine tool parts are subjected to force, the actual pressure of the contact part is very large. When they move relatively, the machine tool will produce elastic deformation, plastic deformation and shear fracture at the contact, resulting in mutual crushing and breaking between the peaks, resulting in a large amount of wear, and gradually losing the original size and shape accuracy. The direction of machining marks on the surface of parts also has a significant impact on the wear resistance. Under the condition of light load and sufficient lubrication of the machine tool, when the two matching machining traces have the same direction, their wear amount is small. For example, the crankshaft diameter and the bearing bush machining trace have the same direction, and when working under the condition of sufficient lubrication, the wear resistance is better. Under the condition that the heavy-duty fork is not fully lubricated, when the machining trace method of the two mating surfaces is vertical, the wear amount is small. For example, the machine tool guide rail and the saddle work under the boundary friction condition, and their machining traces should be perpendicular to each other. Therefore, for important parts of machine tools that cooperate with each other, the machining trace direction of the final process should be specified.

2022

07/22

Influence on fitting accuracy of machine tool parts

The surface roughness of machine tools will affect the actual fitting properties and fitting accuracy of parts. If the fitting surface of machine tool parts is rough, a large shear pressure will be generated at the top of the machine tool surface during clearance fitting, which is easy to be cut off during relative movement, so that the actual fitting clearance will be increased, thus reducing the fitting accuracy; In the interference fit, the bumps on the surface are sheared and flattened during assembly, which reduces the actual interference, reduces the strength of the interference fit, and affects the service life of machine tool parts. Therefore, in order to improve the reliability and stability of fitting, the machine tool must specify a smaller roughness value for the surface with fitting requirements. Surface residual stress will cause deformation or cracks of parts, cause changes in the shape or size of machine tool parts, and also have a certain impact on the fitting accuracy.

2022

07/22

Main influencing factors of work hardening of CNC machine tools

The main factors affecting work hardening of CNC machine tools are: 1. Tool geometric parameters. When the front angle of the tool is negative, the back angle is too small, and the arc radius of the cutting edge or the cutting edge is worn, the extrusion and friction of the tool on the machined surface of the workpiece will intensify, which will increase the degree of hardening and the depth of the hardened layer. 2. Cutting amount. When the feed rate of CNC machine tool is increased, the cutting force, cutting heat and plastic deformation increase synchronously, so that the degree of hardening and the depth of hardening layer increase; However, if the feed rate is too small, the cutting edge will repeatedly squeeze the machined surface, which will also increase the degree of work hardening. Increasing the cutting speed shortens the contact time between the tool and the workpiece, reduces the plastic deformation, and the increase of the cutting temperature is conducive to the recovery of cold hardness. Therefore, in general, the cutting speed increases and the degree of hardening decreases. 3. Workpiece material. The greater the plasticity of NC machine tool materials, the greater the plastic deformation during cutting, and the more serious the degree of hardening and the depth of hardened layer.  

2022

07/22

How to eliminate faults in precision parts processing

Numerical control lathe is a highly technical, efficient and complex automatic machine tool integrating machine, electricity and instrument. It is an essential equipment in the machinery industry. CNC machine tool manufacturers should be familiar with every part of it, understand the working principle, and maintain and repair the CNC lathe. During the operation of CNC lathe, parts and components will inevitably have different degrees and types of faults. 1. Fully investigate the fault phenomenon and analyze the precision parts processing manufacturer. First, investigate the operator, and ask in detail the whole process of the fault, what phenomenon occurred, and what measures were taken. Then we should make a detailed survey of the site. 2. When looking for the cause of the fault, we should be open-minded, and list the possible causes of the fault as comprehensively as possible, whether it is integrated electrical appliances, machinery or hydraulic pressure. Then make comprehensive judgment and optimal selection to determine the most likely cause of failure. 3. The principle of mechanical before electrical, static before dynamic. Before troubleshooting, you should first pay attention to eliminating mechanical faults. Then, in the running state, dynamic observation, inspection and testing are carried out to find the fault. However, if destructive faults will occur after power on, the danger must be eliminated before power on.

2022

07/21

What are the advantages and characteristics of non-standard hardware parts processing

The processing and production of non-standard hardware parts is very high for actual use, and the processing level and quality are very high, because its processing accuracy is very high, and there are standard and non-standard precision hardware parts. Processing characteristics of non-standard hardware parts: 1. Both non-standard hardware parts processing and standard precision parts processing have high production efficiency. Precision parts processing can process multiple surfaces at the same time. Compared with ordinary lathe processing, it can save a lot of processes and time, and the quality of parts processed by NC is also much more stable than ordinary lathe. 2. The automation of precision parts processing is very sufficient, which greatly reduces the physical labor intensity of workers. Workers do not need to operate the whole process like ordinary lathes in the processing process, but mainly observe and supervise lathes. However, the technical content of the corresponding NC machining is higher than that of the ordinary lathe, so it requires higher mental labor than the ordinary lathe. 3. Non standard hardware parts processing precision parts plays an irreplaceable role in the development of new products. Generally speaking, parts with different degrees of complexity can be processed through programming, while the modification and renewal of design only need to change the program of the lathe, which can greatly shorten the product development cycle.

2022

07/21

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Shenzhen Perfect Precision Product Co., Ltd.
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