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

There are many factors affecting machining accuracy in the process of precision parts machining, and different machining methods can achieve different accuracy under different machining conditions; if you pursue machining accuracy, it will reduce production efficiency and increase the cost of precision parts machining. Therefore, precision machining enterprises should try to achieve the purpose of improving efficiency and reducing production costs under the premise of ensuring quality. The machining accuracy of precision mechanical parts can be divided into dimensional accuracy, shape accuracy and position accuracy. Therefore, the level of machining accuracy is measured by dimensional tolerance, shape tolerance and position tolerance   The method of obtaining the dimensional accuracy of the parts: test cutting method: first test cut a small part of the machined surface, measure the size of the test cut, adjust the position of the cutting edge of the tool relative to the workpiece according to the processing requirements, then test cut and measure again, after two or three test cuts and measurements, when the precision machining dimensions meet the requirements, and then cut the entire surface to be machined. Precision mechanical parts processing journal size trial cutting turning, journal size online measurement and grinding, box parts hole system trial boring processing, precision measuring block manual fine grinding, etc., all through the trial machining shear method. The accuracy achieved by the trial cut method may be very high. It does not require complex equipment, but it is time-consuming and requires several adjustments, test cuts, measurements and calculations. The efficiency is low, depending on the technical water symptoms of workers and the accuracy of measuring instruments; the quality is unstable and only used for single-piece small batch production.   Adjustment method is to adjust the accurate relative position of machine tools, fixtures, tools and workpieces with sample or standard parts in advance to ensure the dimensional accuracy of precision mechanical parts processing, and the dimensions remain unchanged during the processing of a batch of parts... This is the adjustment method. Machining shaft parts on a multi-tool lathe or hexagonal automatic lathe, machining grooves on a milling machine, grinding external circles and hole systems on a centerless grinder, are all adjustment methods. If the milling machine jig is used, the position of the tool is determined by the tool holder; the essence of the adjustment method is to use the fixed distance device or tool setting device on the machine tool or the pre-set tool holder to make the tool reach a certain position relative to the machine tool or jig. Accuracy, processing another batch of workpieces. In mass production, the tool setting device is often adjusted using the travel limiter, sample machine, prototype, etc. The adjustment method has better machining accuracy and stability and higher production efficiency than the test cutting method. It does not require high requirements for machine tool operation, but high requirements for machine tool adjustment. It is commonly used in mass production and mass production. Fixed-size method: precision parts processing using the corresponding size of the tool to ensure that the workpiece processing part of the size of the method is called fixed-size method, that is, the use of standard size tools for processing, precision machining surface size by the following formula to determine the size of the tool; that is, the use of a certain size accuracy of the tool to ensure the accuracy of the workpiece being processed. For example, using a square broach to pull out a square hole, using a drill, reamer, reamer or boring block to process the inner hole, using a combination of milling cutters on both sides of the workpiece to mill a groove, etc., are all part of the sizing tool method.

1, five-axis cnc machining in the clamping, pay attention to see clearly cnc machining workpiece and the name of the program sheet, the model is the same, whether the material size match, the clamping height is high enough, with calipers card number.   2, five-axis cnc machining program list to be consistent with the direction of the benchmark angle indicated in the mold, and then check whether the right 3D drawings, especially the workpiece has been drilled water, be sure to see whether the 3D drawings and the workpiece on the water are consistent, such as unknown feedback to the programmer or find the master clamps on the 2D drawings, to see whether the 2D and 3D benchmark angle is consistent. 3, the machine tool processing speed operator to strictly control, F speed and S spindle speed to adjust each other reasonably well, F speed fast relative to S spindle to speed up, in different areas have feed speed are to do adjustment. After processing, check the quality of no problem before you can get off the machine, to achieve a good processing.   4, five-axis CNC machining before processing, use the calibration table to detect whether the tool swing in the allowable tolerance range, the tool head and locking nozzle to be processed before the air gun blow clean, or wipe with a cloth before loading the tool, too dirty on the accuracy and quality of the workpiece has a certain impact.   5, reasonable with five-axis cnc machining tool processing steel, copper public light knife to strictly distinguish between the use of light knife margin to be reasonable, so that the smoothness of the workpiece and tool life will be better. 6, before processing to understand the content of the CNC machining program sheet, the program sheet must have 2D or 3D diagrams, and to indicate the "X length, Y width, Z height" six-sided data, where there is a plane to indicate the "Z" value, the operator after processing to facilitate detection Data is correct, there are tolerances to indicate the tolerance data.   7, five-axis CNC machining files to formalize the program list, including the module number, name, program name, processing content, tool size, tool feed, especially the tool clamping safety length, the margin of each program, the light knife, to specify clearly, R surface and the plane to be smooth, to be indicated on the program list, the operator in the processing to improve 0.02 ~ 0.05MM first processing, gong a few knives when Stop to see if the connection is smooth, feel by hand whether the level, if not smooth when the gong down again. Translated with www.DeepL.com/Translator (free version)

CNC lathe processing is mainly a high-precision, high-efficiency automated machine tool with digital information to control the displacement of parts and tools, a hardware machining method. It can be processed in a wide range. CNC lathe machining accuracy is an important condition in processing, if the CNC lathe machining accuracy is reduced, how to diagnose where the problem is? Learn more about it below! First, the visual method: CNC lathe processing of machine tool failure phenomenon, processing conditions, etc., look at the CRT alarm information, alarm indicators and capacitors and other components have not been deformed smoke scorched; protector decoupling and other abnormal sounds heard, smell the smell of electrical parts scorched and other odor of touching whether there is heat; then check whether there is vibration and poor contact, etc. Second, the parameter check method: parameters are usually kept in RAM, battery voltage is insufficient, the system is not powered for a long time or external interference will make the parameters lost or confused, should be checked and corrected according to the characteristics of the fault related parameters. Third, the isolation method: some faults are difficult to distinguish between the CNC part or servo system or mechanical part, generally more commonly used isolation method of inspection. Fourth, the same kind of adjustment method with the same function of the spare board to replace the suspected failure of the template, or the same function of the template or unit replacement. Fifth, the functional program test method can be used g, m, s, t; function of all the instructions to make small programs, run these programs in the diagnosis of the fault, you can determine the lack of function.

Precision parts processing needs to produce high quality and stable products, so how to improve the quality of precision parts processing in the production process? The following by the editor to answer for you. First of all, the staff must have a wealth of mechanical processing work experience and excellent skills. Mechanical processing is necessary to have excellent skills to do a good job, it is known that mechanical processing is the same precision work. Very test production process, even if it can do a good job, but also to consume a long time, if at the beginning to do not have a good start, it is very easy to abandon the work.   Secondly, whether the processing process is standard and excellent also determines whether the product is of high quality. This is also an indispensable reference point when we use to draw up company rules and regulations. Production and management are bound to need a set of perfect process, the process is for the manufacture of perfect products and services. Once again, the production process must pay attention to communication, whether it is the nodal moment or a problem, we must strengthen communication, processing plants and equipment manufacturers to communicate is an important condition for good automation equipment parts processing. Processing personnel are usually in accordance with the drawings to carry out processing work, but more often than not, many process sites can be simplified and improved, both to reduce costs and to improve power.

Fasteners generally require surface treatment, fastener surface treatment of many types, generally commonly used electroplating, oxidation, phosphating, non-electrolytic zinc flake coating treatment, etc.. However, electroplated fasteners occupy a large proportion in the actual use of fasteners. Especially in the automotive, tractor, home appliances, instrumentation, aerospace, communications and other industries and fields are more widely used. However, for threaded fasteners, not only is a certain degree of corrosion resistance required in use, but also the interchangeability of threads must be ensured, which can also be called spinability in this case. In order to meet both the "corrosion protection" and "interchangeability" requirements of threaded fasteners, it is necessary to establish a special plating standard.

Fasteners are a class of mechanical parts that are used for fastening connections and are widely used. Fasteners, the use of a wide range of industries, including energy, electronics, electrical, mechanical, chemical, metallurgical, mold, hydraulic and other industries, in a variety of machinery, equipment, vehicles, ships, railroads, bridges, buildings, structures, tools, instruments, chemicals, instruments and supplies, etc., can see a variety of fasteners, is the most widely used mechanical foundation parts. It is characterized by a wide variety of specifications, different performance uses, and standardization, serialization, generalization of the degree is also extremely high. Therefore, some people also have a national standard for a class of fasteners called standard fasteners, or simply referred to as standard parts.

Regular maintenance of mold parts plays a vital role in the life of the mold. The annual maintenance program required for each injection molding location depends on the different mold cycle times. Here are some mold parts overhaul tips that every mold user can use to ensure the effective operation of mold components such as hot runners, heaters, guide pillars and ejectors, molding inserts, etc. to prevent unexpected situations from occurring. 1. Check for warning rust or moisture at the air dispersal holes. If you find rust or moisture near the hot runner vent, it means internal condensation, or a possible rupture in the plumbing. Humidity can trigger a short circuit that is fatal to the heater. If the machine is not running year round and needs to be shut down at night, then the chances of this condensation occurring increase.   2. Remember to remind the operator not to "clean out" the hot nozzle tip at the gate. If the operator happens to see a small piece of stainless steel at the mold spout, it may be a spot spout assembly. "Cleaning out" what appears to be an obstruction can often ruin the hot nozzle head. To avoid damaging the hot nozzle, verify the nozzle type of the hot runner system before taking action, and make sure all operators are trained to recognize the different types of nozzles they are touching.   3. Slide the stopper. For machines that run year-round, this work should be done once a week. And the end of the year is a good time to give these parts a routine lubrication maintenance.   4. Interactively calibrate the resistance value of the heater. You should have measured the resistance value of the heater when you first started using it, and the end of the year is the time to measure it again and compare it. If the resistance value has a ±10% fluctuation, it is time to consider replacing the heater to ensure that it does not fail at a critical point in the production process. If the initial resistance value is never measured, measure it once and use the resulting value as reference data for future inspections of the heater. 5. Look for signs of wear between the guide pillar and guide bushing. Look for any traces such as scratching or scuffing, this kind of mold parts wear is caused by lack of lubrication. If the marks only just appear, then you can still extend the life of the guide pillar and guide bush by adding lubricant to them. If the wear is already severe, then it is time to replace the parts with new ones. Otherwise, the cavity and core parts may not fit well, resulting in parts with different cavity wall thickness.   6、Check the water flow. Connect a hose at the outlet of the water line and let the water stay in the barrel through the hose. If the water flowing out is not clear or has a color, rust may have occurred, and a poor water flow means a blockage somewhere. If you find these problems, drill through all the hoses again (or take whatever method you most often use to clean them) to ensure a clear flow. Improving the plant's water treatment system can prevent future problems caused by rust and blockages.   7. Clean the thimble. After a year, the thimble will become dirty due to gas hoarding and film-like impurities. It is recommended to clean it well with mold cleaning agent every 6~12 months. After cleaning, then apply a layer of lubricant to the ejector pin to prevent scuffing or breakage.   8. Check the radius area of the hot nozzle for fractures. The fracture is caused by the loose hardened plastic pieces left in the hot nozzle of the machine during forward injection by the clamping force from the barrel assembly. The cause of the problem may also be a misalignment of the line. Both possibilities are considered when finding a break. If the damage sustained is severe enough to prevent a petal-like leak, the gate bushing should be replaced promptly.

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.

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.

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.