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How to reduce the scrap rate of parts in precision machining? The following is the understanding of precision workpiece CNC machining knitting, hoping to help you.
In the process of precision machining, the design of workpiece should be correct. In the process of design, it should be studied whether the processing is simple, whether the process and requirements meet the essential conditions of the workshop and market supply, whether the precision machining enterprises need to provide improved equipment, high precision processing equipment and inspection equipment. In terms of material usage, it is also important to calculate the raw materials required for each workpiece, process placement, and processing methods, and to comply with strict process requirements.
In precision machining, the first step of the processing staff is to see clearly the technical requirements of the drawings. Complying with the process is the basic of precision machining. Check the drawings of the parts are intact and accurate, and analyze the accuracy, surface integrity and technical requirements of the key surface of the parts under the existing production conditions. Therefore, in the timely and wonderful experience of mechanical processing, some people who have experience in mechanical processing may also wish to reduce the scrap rate of the workpiece.
To sum up, we should see through the technical requirements of the drawings; follow the process; select the appropriate speed feed; precisely select the tool angle; cut the workpiece to meet the requirements to complete the processing mission; accurate and practical measuring tools, comply with strict process requirements. Product quality is the key to decide the success or failure of enterprises, so it is not too late to reduce the scrap of precision machined workpieces and improve the quality of workpieces for every precision machined workshop.?CNC?Machining?service
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These raw materials are used for manufacturing fixtures and fixtures, but different raw materials have different uses. Each kind of raw material has different characteristics. Follow me to get a general idea of the use of each kind of raw material.
1. A3, 45, the raw material is cheap, usually used in the motherboard without auxiliary fixture;
2. P20, CR12MOV, usually the important parts of fixture, because the selected raw materials can wear-resistant, will strengthen the service life of products, and ensure the accuracy of application;
3. The main raw materials of S136 are wear resistance and rust resistance. Usually used in welding fixtures is a common raw material.
4. SKD11 raw materials are usually used in checking tools and some sophisticated and wear-resistant fixtures.
5. Tungsten steel, this raw material is used a little bit less, because the cost of raw materials is quite expensive, usually used in meticulous inspection tools, mainly if the wear resistance and rust resistance is high
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The key factors affecting the cold working hardness of CNC parts are as follows:
1. Factor of machining raw materials: The hardness of processed raw materials is small, and the hardness level of raw materials with greater plasticity is more important.
2. Formal factors of cutters: the rake angle, edge roundness and wear of the back of the cutter in CNC machining have a great influence on the hardening layer. When the front angle decreases and the wear of the edge and rear edge increases, the depth and hardness of the hardened layer increases.
3. Cutting parameters of CNC parts: the change of cutting speed and feed rate has a great influence on cold work hardness. With the increase of cutting speed, the contact time between the tool and the workpiece is short, the plastic deformation level is small, and the hardness and hardness are reduced. With the increase of feeding speed, the plastic deformation level increases, and the surface cold hardening level increases.
Therefore, as long as the above factors are correctly prevented, there will be no problem of hardness in CNC machined parts.
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CNC Machining process can be distinguished by two different principles, i.e. machining set principle and process distribution principle.
CNC Machining set principle refers to that no process contains as much processing content as possible, so as to reduce the total number of processes. The principle of CNC Machining set is applicable to workpiece processing on efficient special equipment and CNC machine tools. The advantages of selecting the principle of process set are: increasing the production efficiency; reducing the number of processes, reducing the process route, simplifying the production plan and organizational work; reducing the basic number, the number of manipulators and the area occupied; reducing the number of workpiece clamping, not only ensuring the mutual position accuracy between the processing surfaces, but also reducing the fixture. Number and auxiliary time of clamping workpiece. However, the investment of CNC Machining equipment and industrial equipment is large, it is difficult to adjust and maintain, and the production planning cycle is long, which is not conducive to conversion.
The process distribution is to distribute the workpiece processing in more CNC Machining processes, and the processing content of each process is very small. CNC Machining distribution principle is applicable to simple structure of processing equipment and process equipment. The advantages of selecting the principle of process distribution are that the processing equipment and process equipment are simple to operate, easy to adjust and maintain, and easy to transfer production. It is conducive to selecting the correct cutting parameters and reducing the time of maneuvering. However, the Machining route is long, the area is large, the number of equipment and workers required is large, and the processing accuracy is greatly affected by the skill level of manipulators.
We have more than 10 years’experience in precision CNC Machining parts, and are professional at precision parts machining, CNC processing and four-axis machining. We are familiar with the OEM technology and quality requirements of the United States and the European Union. By means of international standards, we can ensure high quality, reasonable price and prompt delivery.
As far as our precision machine parts machining industry, adequate accuracy is often a relatively intuitive reflection of the processing strength of its workshop. We know that temperature is a major factor affecting the processing accuracy. Here is a brief introduction from CHENGCHUAN.
Under the action of various heat sources (conflict heat, cutting heat, ambient temperature, thermal radiation, etc.) in the process of intrinsic machining, thermal deformation will occur when the temperature of machine tool, tool and work piece being processed changes, thus affecting the relative displacement between work piece and tool, forming processing deviation, and then affecting the processing accuracy of parts. For example, when the linear expansion coefficient of steel is 0.000012 /, the elongation of steel parts with length of 100 mm will be 1.2 um when the temperature rises by 1C. Temperature transformation not only directly affects the expansion of work piece, but also affects the accuracy of machine tool equipment.
In precision machining, higher requirements are put forward for the accuracy and stability of the work piece. According to the statistics of related materials, the processing deviation caused by thermal deformation accounts for 40%-70% of the total processing deviation in precision machining. Therefore, in order to prevent the expansion and contraction of the work piece due to the temperature transformation, the reference temperature of the constitutional environment is usually strictly controlled. The deviation boundaries of the temperature transformation are drawn up, which are 20 +0.1 and 20 +0.0.0. Constant temperature processing at 1 C still occurs.
Normally, for the constant temperature and humidity laboratory for precision processing, in order to prevent the work piece from expanding and shrinking due to the temperature change during processing and measurement, the standard temperature in the laboratory is usually strictly regulated, and the deviation boundaries of temperature change are drawn up. However, the requirement of relative humidity of air has no requirement for the accuracy of textile testing. Strict. For a national ultra-precision processing laboratory, the required temperature is 20 +0.2, while the relative humidity is 45%+5%.
In the future, with the development of society and the progress of technology, the technology of temperature control for precision parts processing will be more and more developed.
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When making CNC workpiece, we often encounter the problem of machine collision, which not only affects the processing efficiency, but also may destroy the workpiece, more likely to form personal events. So what are the causes of the collision in the CNC machining center?
(1) Knife compensation input error is a common cause of collision.
1. Coordinate offset compensation 60 miles input error
2. Workpiece coordinates G54 and other input errors
3. Length G43 compensates for H input error or call error
4. Radius G41 compensates for D input error or call error
5, G40 or G49 or G80 input errors
(2) Error manipulation
1. Wrong Procedure
2. Installing the wrong knife
3. Error processing coordinates
4. Start-up does not return to the origin
5. Handwheel or Manual Target Error
(3) Unique procedures can also lead to crashes.
1. There will be more than one tool change in the program (it will collide with the machine because of the tool repair error)
2. The program returns to the machined cutter point (bumping plate or screw) after the cutter is removed from the mechanical reference point.
3. The program cuts diagonally at the beginning (Z appears in front of H)
4. Safety height is lower (impact plate or nut)
Do you remember the above reasons? I hope you will pay more attention in your work.
Professional engaged in CNC Turning parts, CNC Machining parts, general lathes, milling machines, grinders, wire cutting, sparks, sheet metal, welding as one of the precision processing enterprises, products involved in medical, automation, optoelectronics, communications, energy, electronic components, etc., welcome to send drawings for consultation.
How to Select High Efficiency CNC Machining Production
At present, the varieties of CNC Machining lines are rigid automatic lines and flexible CNC Machining lines. Which kind of CNC Machining lines should be placed in CNC Machining field should be confirmed according to the change of products and output. If a large number of production lines are produced, and compared with mature production lines, then rigid lines should be chosen, because the work efficiency is high. However, if it is in small and medium batches, and the product has a positive change, then flexible line should be selected, because the production process of this line is a set of control, and it is suitable.
The other factors, such as the degree of change of CNC production line, the life cycle of products and the transformation of products, are also included in our research on the needs of choosing production line. In this respect, flexible production line is better than rigid production line, because it is more sensitive, more adaptable, and can reduce the investment crisis.
At present, there is a new method of CNC manufacturing line, which is the combination of automatic line and flexible CNC machining center, resulting in the production line, mainly automatic line. To ensure the accuracy and stability of the production line, CNC Machining is used for other processes. This production line also has certain advantages, so there will be, but also according to the nature of the situation to determine whether it is appropriate, can not be confused to use.
CNC Truning repetitive parts put into production: the use of CNC grinder process preparation time comrade-in-arms higher proportion. For example, preparation of process analysis, programming, adjustment and trial-cutting of Parts’first parts, etc., the sum of these comprehensive working hours is often tens to hundreds of times of the working hours of Parts’ single-part processing, but the working contents of these CNC lathes can be saved and reused, so when a part is successfully manufactured on a CNC grinder and put into production again and again. The production cycle is greatly reduced, the cost is reduced, and good economic benefits can be obtained.
It is required that the key parts of medium and small batches produced with high quality and high efficiency should be processed: CNC grinding machine can realize high precision, high quality and high efficiency grinding under the control of computer. Compared with the special grinding machine, it can save a lot of special process equipment, has a strong flexible manufacturing ability and obtains better economic benefits. Compared with ordinary grinding machine, it can eliminate many human interference factors in the long process of complex processing, and has good accuracy consistency and interchangeability of parts, and high processing efficiency.
The parts processed by CNC Machine?should conform to the technological characteristics that can give full play to the multi-process centralized processing of CNC grinder. When CNC grinder processes parts, the situation of grinding wheel cutting workpiece is exactly the same as that of corresponding non-CNC grinder, but it can carry out some compound processing with the requirement of processing accuracy, such as in the grinding range. Ordinary grinding machine is mainly used to grind cylindrical surface, conical surface of circular NC lathe or end face of stepped shoulder. In addition to NC cylindrical grinding machine, it can also grind ring surface, as well as all kinds of complex combination surface.
The processing batch of parts should be larger than that of ordinary lathe batch CNC lathe in non-CNC grinder processing, small batch parts. For various reasons, the pure cutting time only accounts for 10%-30% of the actual working hours. When processing on CNC grinder with multi-process centralization such as grinding processing center, this proportion may rise to 70%-80%. But preparing to adjust the working hours is often much longer, so it will become uneconomical when the batch size of parts is too small.
Considering the processing of some special parts processed by CNC NC lathe, although some parts are processed in small batches, ordinary lathes have complex shapes, high quality and good interchangeability, which can not meet the above requirements on non-CNC grinders, and can only be processed on CNC grinders, such as parabola, cycloidal cams and special ones. The mirror of the surface, etc.