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

CNC machining has the following advantages: ① The number of tooling is greatly reduced, and complex tooling is not required for processing parts with complex shapes. If you want to change the shape and size of parts, you only need to modify the part processing program, which is applicable to the development and modification of new products. ② The NC machining quality is stable, the machining accuracy is high, and the repetition accuracy is high. It meets the processing requirements of precision robots and high-end automation equipment. ③ CNC machining has high production efficiency in the case of multiple varieties and small batch production, which can reduce the time for production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the best cutting amount. CNC machining ④ It can machine complex surfaces that are difficult to machine by conventional methods, and even some unobservable machining parts by CNC. Huiwen CNC machining center is suitable for medium and small batch production with complex part shape, high precision requirements and frequent product replacement. New and old customers are welcome to send drawings for evaluation~ CNC machining has the following disadvantages: 1) High processing cost not bad In many parts processing technologies, CNC processing should be one of the most expensive processes. 2) Long processing time CNC machining cycle is long, which is well-known. When the machining design of CNC parts has special requirements (such as precision tolerance requirements and thin-wall design), special tools, more precise quality control, lower processing speed, and more complex processing steps need to be used, which will seriously affect the time. CNC machining 3) High equipment maintenance cost The disadvantage of NC machining is that machine tools and equipment are expensive and maintenance personnel are required to have a high level.

cnc machining refers to precision machining controlled by computer, which is mainly used for processing various precision parts. What are the causes of common failures in ordinary CNC processing? What are the causes of over cutting during machining? 1、 Causes of common faults in cnc machining 1. Overload. Causes: excessive cutting, frequent positive and negative rotation, spindle motor failure, spindle drive installation failure. 2. The spindle does not rotate. Cause: The spindle drive installation fails, the CNC installation cannot output the speed signal, the spindle motor fails, the spindle drive installation fails, and the drive belt is broken. 3. The spindle speed deviates from the command value. Cause: The motor is overloaded, the spindle speed command output from the CNC system is faulty, the speed measurement installation is faulty, or the speed response signal is disconnected. 4. Abnormal noise and vibration of the spindle. Cause: In the process of deceleration, the spindle drive is installed with problems, such as the regeneration circuit fault in the AC drive. Precision hardware parts 2、 Causes of over cutting in cnc machining 1. The arc machining of the machining center is excessively cut. If the radius rD of the selected tool is too large and exceeds the radius r of the arc to be processed, it is likely to cause over cutting when the internal summary of arc machining is stopped in CNC machining. The NC machining program is compiled based on the theoretical summary of the workpiece path, without considering the motion path of the tool in the actual machining process. Due to the existence of the tool radius, the actual tool path becomes thicker and does not coincide with the programmed path. In order to get the correct summary of the workpiece surface, the tool radius compensation command is required to set between the tool path and the programming path. Otherwise, the over cutting of the workpiece cannot be prevented. 2. Identification of over cutting during linear machining. If the tool radius is too large when cnc machining the workpieces composed of linear segments, it is likely to present the phenomenon of over cutting, leading to workpiece failure. It can be judged by the positive and negative scalar product of the correction vector corresponding to the programming vector. So that's the end of today's explanation. That's all for today. I believe you have a certain understanding of the common faults in CNC processing and the causes of over cutting. Thank you for your patience.

1. First, CNC machining precision parts is more efficient. CNC machining parts can process and produce several machining surfaces. Compared with the ordinary machining center, it can save more production technology and improve efficiency, and the product quality of CNC machining parts is also better than that of ordinary lathes. More reliability. 2. CNC machining precision parts processing has an irreplaceable use in new product development. Generally speaking, different parts with complex structure can be produced and processed through code programming, and the modification and content update of design and production only need to adjust the program code of the machining center, which can greatly shorten the development progress of new products. 3. The mechanical automation level of CNC machining precision parts is very high, which greatly reduces the manual work intensity of operators. Operators do not need to operate the whole process like ordinary lathes in the production and processing process, but mainly observe and supervise the machining center carefully. However, the corresponding CNC processing technology is more difficult than the ordinary lathe, so it needs more technicians than the ordinary lathe.

The so-called non-standard parts processing, in essence, it refers to the process of forming these parts are not produced and made in accordance with the relevant regulations and requirements. Parts of this nature are used in both the metal and non-metal industries. Depending on what is actually required, many models are not produced with the specifications intact as designed. After all, every device has its error values. The machining of non-standard parts has a great significance and role for the equipment industry.   Non-standard parts processing refers to the type, specification, performance, size, drawing, tolerance and fit, technical file number and code, technical language, unit of measurement and the materials and process equipment used, etc., not manufactured according to a unified standard of mechanical equipment. Non-standard parts are non-standard equipment, not in accordance with the uniform industry standards and specifications promulgated by the state manufacturing equipment, but according to their own use needs, self-designed and manufactured equipment. And the appearance or performance of the equipment is not in the national equipment catalog. In order to meet the needs of large industrial production, the machinery and equipment that have been produced and proven to perform well in use are stereotyped and serialized, called standard products. And according to the user requirements, on the basis of the standard products, production, transformation or customized products are called non-standard products. The field that mentions more occasions of non-standard products is mainly the chemical and petrochemical industry. Because there are many products in this industry and the process is very different, so there are more non-standard products.

According to the experience of the precision machining factory, precision cutting is relying on high precision, rigid machine tools and finely sharpened tools with very high or very low cutting speed, very small depth of cut and feed in the workpiece surface to cut a very thin layer of metal process, obviously, this process can significantly improve the machining accuracy of the parts. Because of the cutting process residual area is small, and largely exclude the adverse effects of cutting forces, cutting heat and vibration, and so can effectively remove the surface degradation layer left by the previous process, after processing the surface basically does not have residual tensile stress, roughness is also greatly reduced, greatly improving the quality of the machined surface. Pressure machining is one of the elements of precision machining. Pressure processing is the use of plastic deformation of metal under the action of external forces to obtain a certain shape, size and mechanical properties of raw materials, blanks or parts of the production method, known as metal pressure processing, also known as metal plastic processing. Rolling: metal billet in the gap between the two rotary rolls in the pressure deformation to obtain a variety of products processing methods. By friction, the billet continuously through the gap between the rolls and deformation under pressure. Forging: in the forging equipment and tools (die) under the action of the billet or ingot plastic deformation to obtain a certain geometric size, shape and quality of forgings processing methods. Extrusion: metal billet in the extrusion die pressure is extruded out of the die hole and deformation processing method. Drawing: The processing method in which the metal billet is pulled through the die hole of the drawing die and deformed. Stamping: The sheet metal is pressed between the dies to produce separation or forming. Spinning: In the rotation of the blank with the die or the rotation of the spinning tool around the blank, the spinning tool is fed relative to the blank so that the blank is pressed and deformed continuously, point by point.

We need to pay attention to every matter in every work, especially in the case of precision parts processing, so as to be able to get good practical results in the case of work. Then precision parts processing need to pay attention to what? Let's go to understand the following. 1, mechanical work before checking whether a part of the movement is filled with lubricant, and then start and check the clutch, brake system is all normal, and the machine will be airborne 1-3 minutes, the machinery has a common fault when the actual operation is prohibited. 2, when working to maintain the correct posture, to have sufficient mental substance to deal with the work, such as the discovery of physical discomfort need to immediately leave the post, and to the leading cadres reflect. The actual operation must be conceptually centralized, prohibit gossip, cooperate with each other, and the operator must not operate the actual operation in the case of distraction and exhaustion to prevent safety accidents and ensure the safety of operation. Before entering the post, all workers check whether their own clothing is in line with the work standards. It is forbidden to wear sandals, high-heeled shoes and clothing that endanger safety, and those with long hair should wear safety helmets. 3, when removing and replacing the mold first power off, high-speed punching machine movement unit to terminate the operation, you can just start to install, adjust the mold. After installation and adjustment, take the hand to move the pump flywheel to test punch 2 times, check whether the left and right molds are symmetrical and effective, whether the screws are solid, and whether the wrap-around strip circle is on the effective part. 4, be sure to wait for all other personnel to leave the mechanical work area, and take away the miscellaneous items on the workbench, you can turn on the power to start the machinery. 5、When the machine is working, it is strictly forbidden to put your hand into the working area of the slider and to take and put the workpiece by hand. When taking and putting workpieces in the stamping die, it is necessary to use special tools in accordance with the regulations. If you find that the machinery has abnormal sound or the equipment does not work, you should immediately turn off the main switch to carry out the inspection. After the machinery is started, one person should understand the actual operation of the machinery, and no one else should press the electric construction or step on the button switch board, and no one should put their hands into the working area of the machinery or move the moving part of the machinery with their hands. 6, after work, should shut idle switch power, and comb the position of manufactured goods, side materials and debris, etc., to ensure that the office environment clean and safe.

To ensure precision machining accuracy. Many workpieces are subjected to cutting forces, clamping forces, and more thermal values, should be separately roughing and finishing. Because when rough machining. Very easy to lead to surface hard bottoming, the workpiece internal has a large internal stress, if finishing and roughing is continuous after finishing fine parts precision will be accompanied by ground stress again all over, quickly will be lost. For some parts with high machining accuracy. After rough machining and before finishing should be ultra-low temperature quenching or aging treatment to remove internal stresses. The main process of rough machining is to disconnect most of the machining margin, and rough machining CNC lathe only needs high power and low precision production machining. Finishing requires a finer CNC lathe. Not the same CNC lathe on the rough and finish machining, do not provide for higher processing accuracy. Thus. Not only can fully use the characteristics of the machine and equipment, and can increase the use of precision machinery period. Heat treatment is often required in the machining process. The heat treatment process is assigned as follows: To improve the cutting performance of the metal. Generally performed before machining. To remove internal stresses, such as quenching, hardening, and heat treatment. Such as aging treatment and tempering treatment are generally carried out after rough machining and before finishing machining. In order to improve the physical properties of the parts, nitriding, heat treatment, quenching, etc., generally after machining. If there is deformation after heat treatment, it is important to assign the final production process.

Precision machining is not possible for all materials. Some materials are too hard, exceeding the hardness of the machined equipment parts, the possibility of parts breakage is high, therefore? Such materials are not suitable for precision machining. Unless the parts are made of special materials or laser cutting. What are the material requirements for precision machining? The materials for precision machining are divided into two kinds, metal materials and non-metal materials. For metal materials, the hardness is greater than stainless steel plate, followed by pig iron, followed by copper, and finally aluminum. The processing of porcelain, plastic, etc. is the processing of non-metallic materials. Dongguan precision machining requirements for material hardness, in some places, the higher the hardness of the material the better, limited to the hardness requirements of the processing equipment parts, the processing of the material can not be too hard. Suppose than the parts can not be processed. Precision machining material hardness is moderate, at least one level lower than the hardness of the parts, together with the effect of processing parts is what, effective choice of parts. Dongguan precision machining of the material requirements and some, any material is not suitable for processing. For example, soft or hard material, the former does not need to be processed, the latter can not be processed. Therefore? Before processing must pay attention to the relative density of the material, assuming that the relative density is too large, the hardness is also very large, the hardness exceeds the parts (CNC lathe turning tool) can not be processed, not only will damage the parts, but also continue to pose a risk. For example, the lathe tool fly out of the injury, etc.. Therefore? Generally speaking, about mechanical professional processing, the material is less hard than the tool, can be processed.

With the improvement of the current quality of life, metal stamping parts have gone deep into various fields, and it has been closely related to our life. The metal stamping parts are made by stamping process, which is a processing method to obtain workpieces of certain size, shape and performance by applying external force to the work-piece blank through the mold to cause plastic deformation or separation. The stamping and stretching process shall be selected and designed according to the actual conditions of equipment and personnel, with advanced technology, reasonable economy and safe and reliable use. The following describes the technological advantages and manufacturing principles of the metal stamping parts: 1、 Technological Advantages of Metal Stamping Parts (1) The assembly and repair of metal stamping parts require convenience, convenience and energy saving. (2) The shape of the metal stamping parts is simple and the structure is reasonable, which can be conducive to the manufacturing of the mold. (3) Hardware stamping parts shall be used to the maximum extent or to the existing materials, equipment, process equipment and process flow. (4) Metal stamping parts can improve the utilization rate of metal materials and reduce the types and specifications of materials. (5) The metal stamping parts are conducive to the interchangeability of the same batch of workpieces to reduce the scrap situation. 2、 Manufacturing principles of metal stamping parts (1) Precision principle: the number of processes of deep drawing parts is related to material properties, drawing height, number of drawing steps, drawing diameter, material thickness, etc. (2) Fine principle: the number of processes for bending parts mainly depends on the disorder degree of their structural shape, which should be determined according to the number of bending angles and bending direction. (3) Exquisite principle: when the section quality and standard precision of the stamping parts are required to be high, it can be considered to add the finishing process after the blanking process or directly select the fine blanking process. (4) Precision principle: when blanking workpieces with simple shapes, single process die can be used. When blanking workpieces with messy shapes, due to the limitation of the structure or strength of the die, it is summarized in the table that several parts should be divided for blanking, and multiple metal stamping processes should be used. (5) Boutique principle: in order to ensure the quality of fine metal stamping parts, sometimes the number of processes is required. For example, the additional process hole punching of bending parts, the addition of deformation reduction hole punching in the forming process to transfer the deformation area, etc., ensure the degree of fine and exquisite products.

The metal stretching process shall be combined with the actual situation, and a reasonable process plan shall be selected from the aspects of quality, strength, environment and production, so as to reduce the process investment as much as possible on the basis of ensuring that the production meets the requirements of the drawings. Type and process requirements of metal stretching process: 1、 Type of metal drawing process (1) Cylinder stretching: stretching of cylinder with flange. The flange and the bottom are straight, and the cylinder is axisymmetric. The deformation is uniform on the same circumference, and the blank on the flange has deep drawing deformation. (2) Elliptical stretching: the blank on the flange is stretched and deformed, but the deformation amount and deformation ratio change accordingly. The greater the curvature, the greater the deformation of the part of the blank; The deformation of the part with smaller curvature is smaller. (3) Rectangular stretch: a low rectangular piece formed by one stretch. When stretching, the tensile resistance at the fillet of the flange deformation area is greater than that at the straight edge, and the deformation degree at the fillet is greater than that at the straight edge. (4) Hilly stretching: the side wall is suspended in the process, and it will not stick to the mold until the end of forming. The deformation characteristics of different parts of the side wall are not completely the same during forming. (5) Dune shaped drawing: the blank deformation of the mound shaped cover plate in the forming process is not a simple tensile deformation, but a composite forming in which both tensile and bulging deformation exist. (6) Hemispherical drawing with flange: when the spherical part is stretched, the blank partially contacts the spherical top of the punch, and most of the rest is in a suspended state. (7) Flange stretching: stretch the flange slightly. The stress and strain situation is similar to that of compression flanging. (8) Edge stretching: angle re stretching is carried out for the flange, and the material is required to have good deformation. (9) Deep stretching: it can be completed after more than two times of stretching. The wide flange stretch piece is stretched to the required flange diameter at the first stretch, and the flange diameter remains unchanged at the subsequent stretch. (10) Conical drawing: due to the large degree of deep deformation, the deep conical parts are very easy to cause local excessive thinning and even cracking of the blank, and need to be gradually formed through multiple transitions. (11) Rectangular re drawing: the deformation of high rectangular parts formed by multiple drawing is not only different from that of deep cylindrical parts, but also different from that of low box parts. (12) Curved surface forming: Curved surface stretch forming is a stamping forming method that makes the outer flange part of the metal plate blank shrink and the inner flange part extend, becoming a curved surface shape with non straight wall and non flat bottom. (13) Step stretch: re stretch the initial stretch to form a stepped bottom. The deeper part will deform at the initial stage of stretch forming, and the shallower part will deform at the later stage of stretch forming. (14) Reverse stretching: reverse stretching is a kind of re stretching for the workpieces stretched in the previous process. The reverse stretching method can increase the radial tensile stress, and has a good effect on preventing wrinkling. It is also possible to increase the tensile coefficient of re stretching. (15) Thinning stretching: different from ordinary stretching, thinning stretching mainly changes the thickness of the cylinder wall of the stretching piece during the stretching process. (16) Panel stretching: the surface shape of the panel is complex. In the drawing process, the blank deformation is complex, and its forming property is not simple drawing forming, but the compound forming of deep drawing and bulging. 2、 Scheme of metal drawing process (1) According to the workpiece drawing, analyze the shape characteristics, size, accuracy requirements, raw material size and mechanical properties of the workpiece, and combine the available equipment, batch and other factors. Good drawing process shall ensure less material consumption, fewer processes and less equipment occupied. (2) The calculation of main process parameters is based on the analysis of stamping process, to find out the characteristics and difficulties of the process, and to propose various possible stretching process schemes according to the actual situation, including process nature, process number, process sequence and combination mode. Sometimes there may be multiple feasible process schemes for the same workpiece. Generally, each scheme has its advantages and disadvantages. Comprehensive analysis and comparison shall be carried out to determine the best suitable scheme. (3) Process parameters refer to the data on which the process plan is based, such as various forming coefficients (drawing coefficient, bulging coefficient, etc.), part development dimensions, and various stresses. There are two cases of calculation. The first is that the process parameters can be calculated more accurately, such as the material utilization rate of the part layout, the workpiece area, etc; The second is that the process parameters can only be calculated approximately, such as general bending or deep drawing forming force, blank development size of complex parts, etc. The determination of such process parameters is generally based on the rough calculation of empirical formulas or charts, and some need to be adjusted through tests. (4) The stretching equipment shall be selected according to the nature of the process to be completed and the force and energy characteristics of various equipment, the required deformation force, size and other major factors, and the equipment type and tonnage shall be reasonably selected in combination with the existing equipment. 3、 Selection method of stretching oil (1) As silicon steel plate is a material that is easy to stretch, low viscosity stamping oil will be used to prevent scratches on the premise of easy cleaning of the finished workpiece. (2) When selecting drawing oil for carbon steel plate, the better viscosity should be determined according to the process difficulty and degreasing conditions. (3) Because of the chemical reaction with chlorine additives, it should be noted that chlorine type drawing oil may cause white rust when selecting drawing oil for galvanized steel plate, while sulfur type drawing oil can avoid rust. (4) Stainless steel is easy to harden, so it is required to use drawing oil with high oil film strength and good sintering resistance. Generally, the drawing oil containing sulfur and chlorine compound additives is used to ensure the extreme pressure performance and avoid problems such as burrs and cracks on the workpiece.