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

We know that precision machining according to the processing object can be divided into standard parts processing and non-standard parts processing, relatively speaking, standard parts processing is relatively easy, while the processing of non-standard parts is relatively difficult, many people do not distinguish what is standard parts what is non-standard parts, then the next to introduce what is called non-standard parts it! First of all, we know that non-standard parts are relative to the standard parts proposed, so before understanding the non-standard parts we need to know what is called standard parts.   Standard parts are the structure, size, drawing, marking and other aspects have been completely standardized, and the common parts produced by professional factories, such as threaded parts, rolling bearings, etc.. In a broad sense, it includes standardized fasteners, links, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs and other mechanical parts. Narrow sense only includes standardized fasteners. Domestic commonly known as standard parts is the abbreviation of standard fasteners, is a narrow concept, but can not exclude the existence of a broad concept. In addition there are industry standard parts, such as automotive standard parts, mold standard parts, etc., also belong to the broad sense of standard parts.   Non-standard parts processing professionals elaborate mainly the state did not set out strict standard specifications, no relevant parameters beyond the provisions of the enterprise free control of other accessories. There are many varieties of non-standard parts, and there is no very standard classification. Roughly classified as follows. Metal non-standard parts:   By the customer to provide drawings, manufacturers according to the drawings using equipment to produce the corresponding products, usually the majority of molds, tolerance requirements, finish are specified by the customer, there is no certain paradigm. The products need corresponding quality control from casting to finishing, the process is complicated and variable, and the general cost is higher than standard parts.   Non-metallic non-standard parts.   It is the processing of some non-metallic materials. Such as plastic, wood, stone, etc. In recent years, the injection molding industry, the development of plastic molds increasingly sophisticated, surface design, programming CNC references, so that the cost of non-standard processing and tolerance levels have been greatly improved.

Precision parts processing is not possible to complete all the processing contents of all surfaces in one process, and the whole processing process of precision parts processing can be divided into the following stages. (1) Roughing stage. Cut off most of the machining allowance of each processing surface, and processing of precision benchmarks, the main consideration is to increase productivity as much as possible.   (2) Semi-finishing stage. Cut out the defects that may arise after rough machining, and prepare for the finishing of the surface, requiring a certain machining accuracy and ensuring the appropriate finishing allowance, while completing the machining of the secondary surface.   (3) Finishing stage. In this stage using a large cutting speed, small feed and depth of cut, remove the finishing margin left by the previous process, so that the surface of the part to meet the technical requirements of the drawing. (4) finishing stage. Mainly used to reduce the surface roughness value or strengthen the machined surface, mainly for surface roughness requirements are very high (ra ≤ 0.32 μm) surface processing.   (5) Ultra-precision machining stage. Machining accuracy in 0.1-0.01 μm, surface roughness value ra ≤ 0.001 μm processing stage. The main processing methods are: precision cutting, fine mirror grinding, precision grinding and polishing, etc.

We know that precision machining requires high precision. Precision machining has good rigidity, high manufacturing accuracy and precise tool setting, so it can process parts with high precision requirements. So which parts are suitable for precision machining? First of all, compared with ordinary lathe, CNC lathe has constant linear speed cutting function, no matter for turning end face or different diameter outer circle can be processed with the same linear speed, that is to ensure the surface roughness value is consistent and relatively small. While ordinary lathe is constant speed, the cutting speed is different for different diameters. Under the condition that the material of workpiece and tool, finishing allowance and tool angle are certain, the surface roughness depends on the cutting speed and feed speed.   When processing the surface with different surface roughness, a small feed speed is chosen for the surface with small roughness, and a larger feed speed is chosen for the surface with large roughness, with good variability, which is difficult to be achieved in ordinary lathes. Parts with complex contour shapes. Any plane curve can be approximated by a straight line or arc, cnc precision machining with arc interpolation function, can process a variety of complex contours of the parts. cnc precision machining needs the careful use of the operator's good or bad. CNC precision machining mainly has fine turning, fine boring, fine milling, fine grinding and grinding processes. (1) fine turning and fine boring: the majority of precision light alloy (aluminum or magnesium alloy, etc.) parts of aircraft are mostly processed by this method. Generally use natural single crystal diamond tools, the radius of the cutting edge is less than 0.1 micron. In the high precision lathe processing can obtain 1 micron accuracy and average height difference of less than 0.2 micron surface unevenness, coordinate accuracy can reach ± 2 micron.   (2) Fine milling: used for processing complex shape of aluminum or beryllium alloy structural parts. Rely on the accuracy of the machine's guide and spindle to obtain high mutual position accuracy. High-speed milling with carefully ground diamond tips can obtain accurate mirror surfaces.   (3) Fine grinding: used for machining shaft or hole type parts. Most of these parts are made of hardened steel, which has high hardness. Most high-precision grinding machine spindles use hydrostatic or dynamic pressure liquid bearings to ensure high stability. The ultimate accuracy of grinding is influenced by the machine tool spindle and bed stiffness, but also by the selection and balance of the grinding wheel and the machining accuracy of the center-center hole of the workpiece. Fine grinding can obtain a dimensional accuracy of 1 micron and an out-of-roundness of 0.5 micron.   (4) Grinding: Using the principle of mutual research of mating parts to selectively process the irregular raised parts on the machined surface. The grinding grain diameter, cutting force and cutting heat can be precisely controlled, so it is the most - high-precision processing method in precision machining technology. The hydraulic or pneumatic mating parts of precision servo parts of aircraft and bearing parts of dynamic gyro motors are machined by this method to achieve 0.1 or even 0.01 micron accuracy and 0.005 micron micro-unevenness.

Precision parts in the practical application is inevitably the higher the accuracy, the more exquisite can reflect the level of processing and quality, while these products are also more popular with consumers, generally speaking in the processing of CNC machining has incomparable advantages and characteristics, its product quality is usually higher, so what are the characteristics of CNC precision parts processing? 1, first of all, CNC precision parts processing higher production efficiency, CNC parts processing can process multiple surfaces at the same time, compared to ordinary lathe processing can save a lot of processes, saving time, and CNC processing out of the quality of the parts are relatively ordinary lathe to be much more stable.   2, CNC precision parts machining has an irreplaceable role in the development of new products, generally speaking, through the programming can be different degrees of complexity of the parts processing ah, and change and update the design only need to change the program of the lathe, which can greatly shorten the product development cycle. 3, the degree of automation of CNC precision parts processing is very enough, greatly reducing the physical labor intensity of workers, workers in the process of processing does not need to be like ordinary lathe that the whole control, mainly on the lathe for observation and supervision. But the corresponding technical content of CNC machining is higher than that of ordinary lathe, so it requires higher mental labor compared with ordinary lathe.   4. The initial investment is relatively large compared with ordinary lathe, because the price of CNC lathe is very high, and its maintenance cost as well as the processing of the first sample preparation period is long.

1、Abrasion resistance   When the blank is plasticized in the mold cavity, it flows and slides along the surface of the cavity, causing violent friction between the surface of the cavity and the blank, which leads to the failure of the mold due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mold. Hardness is the main factor affecting wear resistance. Generally speaking, the higher the hardness of the mold parts, the smaller the wear, and the better the wear resistance. In addition, wear resistance is also related to the type, number, form, size and distribution of carbide in the material.   2、Strong toughness   Most of the working conditions of the mold are very bad, and some of them are often subjected to large impact load, which leads to brittle fracture. To prevent the mold parts in the work of sudden brittle fracture, mold to have high strength and toughness. Mold toughness mainly depends on the material carbon content, grain size and tissue state. 3、Fatigue fracture performance   Mold work process, under the long-term role of cyclic stress, often lead to fatigue fracture. The form of small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture. The fatigue fracture performance of the mold mainly depends on its strength, toughness, hardness, and the content of inclusions in the material.   4、High temperature performance   When the working temperature of the mold is high, it will make the hardness and strength drop, resulting in early wear or plastic deformation and failure of the mold. Therefore, the mold material should have a high tempering stability to ensure that the mold in the working temperature, with high hardness and strength. 5、Hot and cold fatigue resistance   Some molds in the work process in the repeated heating and cooling state, so that the cavity surface by the role of tensile, pressure variable stress, causing surface cracking and spalling, increasing friction, hindering plastic deformation, reducing the dimensional accuracy, thus leading to mold failure. Hot and cold fatigue is one of the main forms of hot mold failure, help this kind of mold should have a high resistance to hot and cold fatigue performance.   6、Corrosion resistance Some molds such as plastic mold at work, due to the presence of chlorine, fluorine and other elements in the plastic, decomposition after heat precipitation of HCI, HF and other strong aggressive gas, erosion mold cavity surface, increase its surface roughness, intensify the wear loss effect.

Touch the ultra-precision machining center basin friends should understand, cnc machining plant in CNC machining the whole process is very easy to produce oil leaks. In fact, it is very easy to see the part of CNC machining management center oil leakage. Mainly because of spare parts or machining center cylinder oil leakage caused by. If it is spare parts, maintenance is relatively simple. If it is a cylinder, it is very inconvenient and may cause damage to the equipment. Oil changes that do not meet the regulations usually also cause CNC machining oil leaks. Oil change in the occurrence of the problem is specifically expressed in three levels.   First, for low-viscosity grease parts, oil change casually replaced with high-viscosity grease, it will make the corresponding shell, hole shaft and other sealing characteristics suffer certain hazards, there is also a high probability of significantly reducing the tightness of such parts.   Second, precision CNC lathe machining parts do not clean the car oil tank when changing oil, the waste in the car oil tank will have a high probability of entering the lubrication system, blocking the oil channel and damaging the hydraulic seals leading to oil leakage.   Third, CNC machining oil change when the oil is too much, especially in the parts with rotating parts, because of the stirring effect of rotating parts, more very easy to occur oil leakage conditions. The adoption and adjustment of the lubrication system parts unreasonable and cause CNC machining oil leakage, such as CNC machining maintenance personnel overhauled using a gasoline pump with too high working pressure or too much oil, or adjust the system software working pressure, speed control valve, valve, regulator and other working pressure adjustment is too high, the total flow of CNC lathe lubrication system is too large, etc. and pumping oil system software and its sealing system software does not match If the oil leakage is too high, it will lead to oil leakage.

1, non-standard precision parts processing factor is the poor machining accuracy of the parts themselves. Generally speaking, if the dynamic error between the shafts is not adjusted during installation, or if the shaft drive chain changes due to wear, it will affect the precision of the parts. Generally, the accuracy check caused by this error can be solved by readjusting the compensation amount. If the error is too large or even an alarm occurs, the servo motor needs to be checked to see if its speed is too high. 2, the factor is the amount of overshoot in the operation of the machine tool will also affect the machining accuracy. It may be that the acceleration and deceleration time is too short. Properly extend the replacement time. Of course, it is also likely that the link between the screw and servo motor is loose.... 3, the factor is that the two-axis linkage generated by the roundness of the overshoot, improper adjustment of the machine, the formation of circular axial deformation, axis screw gap compensation is not correct or axis positioning offset, may affect the precision of precision parts. Produce impact.

The common types of wear and tear of precision parts machining mainly include running wear, hard grain wear, surface fatigue wear, thermal wear, phase change wear and hydrodynamic wear.   Run-in wear is the wear of machinery under normal load, speed and lubrication conditions, this wear is generally slow to develop, the short-term impact on the quality of processing is not significant. Hard particle wear is due to the parts themselves dropped abrasive particles or hard particles from the outside into the machine tool, mixed into the processing area, subject to mechanical cutting or grinding, causing damage to the parts, which is more serious impact on the quality of processing   Precision parts processing plant surface fatigue wear is machinery under the action of alternating load, resulting in tiny cracks or class point-like craters, thus causing damage to the parts. This type of wear is usually closely related to the pressure size, load characteristics, machine parts materials, size and other factors.   Heat-like wear is parts in the friction process generated by the heat on the parts, so that the parts have tempering softening, scorching creasing and other phenomena. This type of wear usually occurs in the high-speed and high-pressure sliding friction, wear is more destructive, and accompanied by the nature of accidental wear. Corrosion wear is a chemical effect, that is, chemical corrosion caused by wear. When the parts surface and acid, alkali, salt liquid or harmful gas contact, it will be chemical erosion, or parts surface and oxygen combined to generate easy to fall off the hard and brittle metal oxides and make parts wear.   Phase change wear is parts of long-term work at high temperatures, parts of the surface metal tissue grain heat becomes large, the grain boundary around the oxidation, resulting in small gaps, so that parts fragile, wear resistance decreased, resulting in parts wear.

CNC machining core does not spill the phenomenon of key components not assembled well, we used to be in the application of CNC machine tools machine tools in addition to pick some stronger cnc machining manufacturer in order to better be able to better quality assurance, but also must let the technical assembling staff to undertake assembling, and thus be better able to ensure its smooth operation. The customer also has to check whether the pipeline is blocked, if it is the word to apply the cleaner to blow the drain. The water storage tank is relatively low. CNC machining core often does not sprinkle water is due to the gas inside the centrifugal water pump, the gas discharged from the pump can guarantee that it can all normal sprinkle water; compared with other difficulties, this problem is very easy to deal with relativity.   CNC high precision parts CNC lathe processing, usually is to increase the cohesion of the hazards, with CNC lathe three jaws or four jaws chuck twist tight parts, and subsequently terminate the mechanical parts processing. At the same time to make the clamping force above the mechanical equipment cutting speed to ensure that the parts do not loosen and reduce the nominal diameter force... The clamping force expands with the increase in cutting speed, and then decreases. cnc machining manufacturer this type of work ability to make mechanical parts in the processing of the whole process smooth. Unbeknownst to us, after the three-jaw or four-jaw chuck release, the machined parts will have a large difference from the original, some occur irregular graphics, some occur elliptical type, mainly showing a relatively large error.

For the mechanical industry, the substance they come into contact with most often is a series of parts and components. No matter which style or type, they are more or less familiar and know it. Which parts are used in which structure or which application position, the staff of the relevant industry knows it by heart. However, no matter which configuration is used, it needs to go through certain processing steps before it can be implemented in a specific mechanical device. Therefore, professionals call this step precision parts machining. There are many ways to process precision parts, such as heat treatment methods. A part, a single non-detachable part of a machine, is a basic component of a machine and a basic unit in 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, precision parts cutting processing. There are mainly precision turning, mirror grinding and grinding, etc. In the precision lathe with fine grinding single crystal diamond turning tool to hold micro-turning, cutting thickness of only about 1 micron, commonly used in the processing of non-ferrous metal materials such as spherical, aspheric and flat reflective mirrors and other high-precision, highly polished appearance of the parts.   Second, precision parts processing. Precision parts processing accuracy to nanometers, and even finally to the atomic unit (atomic lattice distance of 0.1 to 0.2 nanometers) as the goal, ultra-precision parts cutting and processing methods can no longer adapt, it is necessary to resort to special precision parts processing methods, that is, the application of chemical energy, electrochemical energy, heat or electricity, etc., so that these energies beyond the joint energy between atoms, so as to remove part of the workpiece appearance of inter-atomic adhesion, The method of ultra-precision machining is achieved by applying chemical, electrochemical, thermal or electrical energy, etc., so that these energies exceed the inter-atomic union energy, thus removing part of the inter-atomic adhesion, union or lattice deformation of the workpiece exterior. This type of processing includes mechanical chemical polishing, ion sputtering and ion implantation, electron beam exposure, laser beam processing, metal vapor deposition and molecular beam epitaxy, etc.