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

Tools can be divided into five categories according to the form of workpiece surface: tools for machining various external surfaces include turning tools, planers, milling cutters, external broaches and files; Hole processing tools include drill, reamer, boring cutter, reamer and internal surface broach, etc; Thread processing tools include tap, die, automatic thread cutting head, thread turning tool and thread milling cutter, etc; Gear cutting tools include hobs, gear shapers, gear shavers, bevel gears, broaches, etc; Non standard parts customization company pointed out that cutting tools include insert circular saw blade, band saw, hacksaw, cutting turning tool and saw blade milling cutter, etc. In addition, there are combined tools. According to the cutting motion mode and corresponding blade shape, tools can be divided into three categories: general tools such as turning tools, planers, milling cutters (excluding formed turning tools, formed planers and formed milling cutters), boring cutters, drills, reamers, reamers and saws; The cutting edges of such tools have the same or nearly the same shape as the section of the workpiece to be processed, such as formed turning tools, formed planers, formed milling cutters, broaches, taper reamers and various thread processing tools; Special tools are used to process some special workpieces, such as gears, splines, etc. For example, gear shaper, shaving cutter, bevel gear planer and bevel gear milling cutter head. Methods to improve the cutting ability of tools: ① Reasonable selection of tool geometric parameters: Front angle: under the condition of maintaining the strength of the cutting edge, the front angle should be appropriately selected to be larger. On the one hand, it can grind a sharp edge, on the other hand, it can reduce cutting deformation, make chip removal smooth, and then reduce cutting force and cutting temperature. Never use negative rake angle tools. (x: i $Y; a, G+m V 4 i. Y D "i&W4 y Rear angle: the size of the rear angle has a direct impact on the wear of the rear tool face and the quality of the machined surface. The cutting thickness is an important condition for selecting the back angle. During rough milling, due to the large feed rate, heavy cutting load and large heat generation, good heat dissipation condition of the tool is required, so the back angle should be smaller. During precision milling, the cutting edge is required to be sharp to reduce the friction between the rear cutting surface and the processing surface and reduce the elastic deformation. CNC parts processing points out that, therefore, the rear angle should be larger.; V; J0 W) G9 O: c7 S:. ② Improved tool structure: Reduce the number of milling cutter teeth and increase the chip space. Due to the large plasticity of aluminum materials and the large cutting deformation during processing, a large chip space is required. Therefore, it is better to have a larger radius at the bottom of the chip groove and fewer milling cutter teeth. Shanghai Batch Aluminum NC Machining Company pointed out that to avoid deformation of thin-walled aluminum parts caused by chip blockage+ W, ?* c5 H4 O! K% [, q $Q 'j! S. K' K, w: T) v $p5 b; h Finish grinding of cutter teeth: the roughness value of the cutting edge of the cutter teeth should be less than Ra=0.4um. Before using a new cutter, a fine oilstone should be used to gently grind the cutter teeth in front of and behind the cutter teeth, so as to eliminate the residual burrs and slight saw tooth lines when grinding the cutter teeth. Strictly control the tool wear standard: after tool wear, the workpiece surface roughness value increases, the cutting temperature rises, and the workpiece deformation increases. Therefore, in addition to selecting tool materials with good wear resistance, the tool wear standard should not be greater than 0.2mm, otherwise chip accretion is likely to occur. During cutting, the temperature of the workpiece shall not exceed 100 ℃ to prevent deformation.

In general workshops, the ambient temperature varies greatly from season to season, and the temperature difference between day and night is also great. In addition, at the same time, the temperature at different locations of workshops is different, and the temperature at different space heights is also different. The linear expansion coefficient a of steel and cast iron is 1.2X10-5/C and 1.1X10-5/C respectively. For the casting with a length or diameter of 100mm, when the temperature rises by 1C, the elongation or expansion will be 1.1pm. In addition to directly affecting the elongation (expansion) and shrinkage of the workpiece, temperature changes have an impact on the accuracy of machine tools and measuring accuracy. Influence of temperature on machining accuracy and measuring accuracy Due to the different materials of various parts and components on the machine tool, the linear expansion coefficient is also different, which causes thermal deformation when the temperature changes, and destroys the original geometric accuracy of the machine tool. Similarly, due to different materials of workpiece and measuring tool (instrument) and different linear expansion coefficient, measurement error is caused. It is internationally recognized that 20C is the standard for temperature measurement. Shanghai CNC machining center pointed out that the measurement error caused by ambient temperature difference can be calculated by the following formula: OL=L [am (Tm-20) - a (Te - 20) -... where: L - measured linear quantity (length or diameter, etc.); 0L linear measurement error; Cm, Tm - linear expansion coefficient and temperature of measuring tool ac, Te - linear expansion coefficient and temperature of workpiece If T=T.=T, there is OL=L [an (Tm - 20) - a (T. - 21 ---. 2 It can be seen from ② that to make △ L → 0, Tm=T.=20C or am=ae is generally less than 3x10-6/C for common materials am ae. Therefore, when processing 100mm long workpieces and measuring at standard temperature, it is required that: When the measurement accuracy is 10pm, the allowable temperature fluctuation is 33C; The measurement accuracy is 1 μ Um, the allowable temperature fluctuation is 3C; The measurement accuracy is 0. l μ When m, the allowable temperature fluctuation is 0.3C The weight and size of each part of the measured parts are different, so the heat capacity is different. To reach the same temperature, different measured parts need different cooling times. Therefore, to reduce the error caused by the temperature difference between the workpiece and the measuring tool during measurement, the workpiece should be placed for different times after entering the thermostatic chamber, so that it can reach the same temperature before measurement. It can be seen from the thermal deformation law that large thermal deformation usually occurs within a period of time (2-6 hours) after the machine tool is started. Before reaching the thermal balance (the temperature reaches a stable value), the temperature rises with time, and its thermal deformation will change with the increase of temperature, which has a large impact on the machining accuracy. When the thermal balance is reached, the thermal deformation tends to be stable gradually. Therefore, precision machining should be carried out after the thermal balance.

CNC exponential control machine tool is programmed and controlled by CNC processing language, usually G code. (CNC parts processing) CNC machining G code language tells CNC machine tools which Cartesian position coordinates to use for machining tools, and controls the feed speed and spindle speed of tools, as well as tool changer, coolant and other fuCNCtions. CNC machining has great advantages over manual machining, for example, the parts produced by CNC machining are very accurate and repeatable; CNC machining can produce parts with complex shapes that cannot be finished by manual machining. CNC processing speed control measures: 1. Flexible acceleration and deceleration control: In CNC machining, the system program usually directly realizes the specific automatic speed control fuCNCtion. In this way, the acceleration and deceleration characteristics of the system should be changed, or the CNC program should be modified through the addition and subtraction control, so that ordinary users can not make the acceleration and deceleration performaCNCe of the CNC machine tool according to their own wishes. Therefore, the flexible acceleration and deceleration control method proposed by us adopts the database priCNCiple, divides the acceleration and deceleration control into acceleration and deceleration description and execution, and separates the acceleration and deceleration description from the system program. In the CNC system software, a general control channel independent of the acceleration and deceleration database is designed, which can independently complete acceleration and deceleration calculation and trajectory control. 2. Flexible CNC processing automatic acceleration control: Set the acceleration curve, analytical curve and non analytical curve, and store them as templates in the acceleration and deceleration curve library in the form of numerical tables. 3. Flexible CNC machining automatic deceleration control: The acceleration control is stored in the acceleration and deceleration curve library as a template in the form of a digital table. Reasonable automatic acceleration and deceleration control is an important link to ensure the dynamic performaCNCe of CNC machine tools. The traditional automatic acceleration and deceleration control based on fixed curve is lack of flexibility, which is difficult to ensure the coordination between acceleration and deceleration process and machine tool performaCNCe, and also difficult to optimize the dynamic characteristics of machine tool movement.

CNC exponential control machine tool is programmed and controlled by CNC processing language, usually G code. (CNC parts processing) CNC machining G code language tells CNC machine tools which Cartesian position coordinates to use for machining tools, and controls the feed speed and spindle speed of tools, as well as tool changer, coolant and other fuCNCtions. CNC machining has great advantages over manual machining, for example, the parts produced by CNC machining are very accurate and repeatable; CNC machining can produce parts with complex shapes that cannot be finished by manual machining. CNC machining technology has been widely promoted, and most machining workshops have CNC machining capabilities. The most common CNC machining methods in typical machining workshops are CNC milling, CNC lathe and CNC EDM wire cutting (WEDM). CNC machining operation details: I The installation and operation procedures of CNC machining center must be followed. Before work, protective equipment shall be worn, cuffs shall be tied, scarves, gloves, ties and aprons shall not be worn, and women's hair shall be tied in hats. II Check the operation of the protection, insuraCNCe, signal, position, mechanical transmission, electrical, hydraulic digital display and other systems on the equipment, and cutting can be carried out when everything is normal. III Before starting, check whether the tool compensation, machine zero point, workpiece zero point, etc. are correct. The relative position of each button shall meet the operation requirements. Carefully prepare and input the numerical control program. IV Before CNC machining, check the operation of lubrication, mechanical, electrical, hydraulic, digital display and other systems. Cutting can be carried out when everything is normal.

CNC lathe, also known as CNC lathe, namely computer numerical control lathe, is the most widely used CNC machine tool in China, accounting for about 25% of the total number of CNC machine tools. CNC machine tools are electromechanical integration products integrating mechanical, electrical, hydraulic, pneumatic, microelectronic and information technologies. It is a machine tool with the advantages of high precision, high efficiency, high automation and high flexibility in mechanical manufacturing equipment. The technical level of CNC machine tools and the percentage of their output and total ownership in metal cutting machine tools are one of the important indicators to measure the national economic development and the overall level of industrial manufacturing of a country. Numerical control lathe is one of the main varieties of numerical control machine tools. It occupies a very important position in numerical control machine tools. For decades, it has been widely valued and developed rapidly by all countries in the world. Causes of deformation during part processing Internal force effect leads to changes in part processing accuracy It is necessary to make the clamping force greater than the cutting force of the machine in order to ensure that the parts are not loose when being processed under force and reduce the effect of internal force. The clamping force increases with the increase of cutting force, and decreases with the decrease. This kind of operation can make the mechanical parts stable in the process of processing. II Simple deformation of heat treated parts after machining As for the processing of mechanical parts such as thin sheets, due to their large length and diameter, the straw hat is simply circuitous after the heat treatment is stopped. On the one hand, it will appear the phenomenon of bulging in the middle; on the other hand, due to the influence of various external factors, it will cause the circuitous phenomenon in the processing of parts. The occurrence of these deformation problems increases the probability of part machining deformation. III Part processing elastic deformation caused by external force effect There are several reasons for elastic deformation in mechanical parts processing. First, if the internal structure of some parts processing is assumed to contain flakes, there will be higher requirements for operation methods. The second is the unevenness of the lathe and fixture, which makes the force on both sides of the part processing uneven when it stops fixing, resulting in the side with less force effect when cutting will show translation and part deformation under the force effect.

The rapid development of numerical control technology makes the use of numerical control machine tools more and more popular. This is because numerical control machine tools have a wide scope of application (product design, processing and assembly), high processing accuracy and processing efficieCNCy. However, due to improper operation or programming errors and other reasons during the training of CNC machine tools, it is easy for students to hit the workpiece or machine tool with the tool or tool holder, which may damage the tool and the parts to be processed, or even damage the machine tool components, resulting in loss of machining accuracy of the machine tool, or even personal accidents. The reason of collision in CNC machine tool processing 1. The most common cause of the collision is the knife compensation input error. We know that precision parts processing in machining plants can not be separated from cutting tools. In the part machining center, how to operate the cutting tool on the workpiece needs to be controlled by the program. If there are input errors in computer programming, it is easy to have a collision. 2. Another type of crash reason is error manipulation. If the attention is not focused during the part processing, it is easy to open the wrong program, make a mistake in the processing coordinates, start the machine without returning to the original point, install the wrong tool, hand wheel or manual target errors, etc., which will directly lead to the machine collision. 3. The unique processing procedure will also lead to machine collision. For example, if a tool needs to be replaced during part processing, the machine may be hit due to a tool repair error; When the part processing program starts, the tool is cut at the diagonal line, which may also lead to machine collision; After cutting at the mechanical refereCNCe point, returning to the cutting point for processing can also lead to collision with the pressure plate or screw.

Among the numerous factors of NC machining technology, the upgrade of mechanical NC software and hardware system has a greater impact on CNC machining technology and CNC machining accuracy. Therefore, in order to improve the overall level of cnc processing technology, the primary concern is to upgrade the cnc processing hardware system. In practical operation, we should start from the following two aspects: on the one hand, we should pay attention to the research of some CNC programs. According to the demand of industrial cnc processing in our country, a cnc processing computer program is designed. Three factors affecting CNC processing technology - CNC lathe processing manufacturer's small compilation to tell us: 1： Position Error in NC Machining The position error affecting the machining accuracy refers to the variation or deviation degree of the mutual positions between the actual surfaces, axes or symmetry planes of the machined parts relative to their ideal positions, such as perpendicularity, positional accuracy, symmetry, etc. The position error in NC machine tool processing usually refers to the dead zone error. The reason for the position error is mainly due to the machining error caused by the clearance and elastic deformation during the transmission of machine tool parts during processing, and the position error caused by the friction and other factors that need to be overcome by the cutter head of the machine tool during processing. In the open loop system, the position accuracy is greatly affected, while in the closed loop servo system, it mainly depends on the accuracy of the displacement detection device and the speed amplification coefficient of the system, which generally has little impact. 2： Due to geometric errors in NC machine tool processing The resulting machining accuracy error During the processing of CNC machine tools, the geometric accuracy of the machine tools is affected by external factors such as external forces and heat generated during processing, and the geometric deformation of the parts machined on the machine tools is caused, which leads to geometric errors. According to research, the main reasons for geometric errors of CNC machine tools are the following two: internal factors and external factors. The internal factors causing geometric errors of the machine tool refer to the geometric errors caused by the factors of the machine tool itself, such as the levelness of the worktable of the machine tool, the levelness and straightness of the guide rail of the machine tool, and the geometric accuracy of the tool and fixture of the machine tool. External factors mainly refer to geometric errors caused by factors such as external environment and thermal deformation during machining. For example, geometric errors caused by thermal expansion and deformation of tools or parts during cutting affect the machining accuracy of machine tools and parts. 3： Machining accuracy error caused by machine positioning in NC machine tool processing Through long-term data analysis and practical operation of parts processing, it can be seen that the positioning of machine tools has a great impact on the processing accuracy of CNC machine tools. In terms of structure, the machining errors of CNC machine tools are mostly caused by positioning accuracy, and the feed system of the machine tool is the main link affecting the positioning accuracy. The feed system of CNC machine tools is usually composed of mechanical transmission system and electrical control system. The positioning accuracy is related to the mechanical transmission system in structural design.

Nowadays, as the automation equipment is constantly improving its strength, to make satisfactory results, not only in industry, in life is not only, are making excellent results, precision parts processing is one of the technology, then precision parts processing need to pay attention to what matters, pay attention to be better. For precision parts, the processing is very strict, the processing process has a tool in, tool out, etc.. There are specific requirements for the size, precision requirements, such as 1mm plus or minus how many microns, etc., if the size is too much wrong will become scrap, which is equivalent to have to re-processing, time-consuming and laborious, and sometimes even make the entire processing material scrap, which causes the cost increase, at the same time, the parts are certainly not available. The above is the answer to the question of what matters need to be noted in the processing of precision parts, in the process of processing, there are many places that need attention, why say so! Because processing is not what can be wrong, nor can there be any error, from the above text, we can know that processing is very strict, only strict, in order to make a fine product.  

Nowadays, with the development of technology and innovation, our industry, many of the same things, they have the same status quo, even long are the same, even the name is similar, this kind of products, to our understanding, is to bring a lot of misunderstanding, precision parts processing is one of them, then parts and components of the two have what kind of difference? Parts, refers to the machinery can not be separated from the individual parts, is the basic components of the machine, but also the basic unit of the mechanical manufacturing process. Its manufacturing process generally does not require assembly processes. Such as bushings, shingles, nuts, crankshafts, blades, gears, cams, connecting rod body, connecting rod head, etc.   A component is a part of a machine and consists of a number of parts assembled together. In the mechanical assembly process, these parts are first assembled into components (component assembly) before they enter the general assembly. Some parts (called sub-parts) are also assembled into larger parts with other parts and components before entering the general assembly.

In the process of processing industry, there are always many parts that we do not recognize, but it plays a different role in the processing industry as well as the effect, a variety of parts have a variety of parts different role, non-standard parts processing is one of them, then non-standard parts and what kind of parts? Non-standard parts are relative to the standard parts proposed. Non-standard parts are mainly the state did not set out strict standard specifications, no relevant parameters outside the provisions of the enterprise free control of other accessories. Classification:   1. metal non-standard parts: provided by the customer drawings, manufacturers according to the drawings using equipment to produce the corresponding products, usually the majority of molds, tolerance requirements, finish are customer specified, there is no certain paradigm.   2. Non-metal non-standard parts: It is the processing of some non-metal materials. Such as plastic, wood, stone, etc.