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

How to Check Worm Quality in Precision Parts Processing The tooth thickness caliper is usually used to measure the normal indexing chord tooth thickness of worm in precision parts processing, or the pitch diameter three needle measurement method can be used. The method for measuring the chord tooth thickness of the worm indexing circle is as follows: the vertical ruler is used to calibrate the normal chord tooth height hnal of the indexing circle, and the level ruler is used to measure the normal chord tooth thickness snl of the indexing circle. The calculation of hani and snl is shown in the table of methods for measuring worm pitch diameter. Method of measuring worm pitch diameter. During measurement, put three measuring rods of equal diameter into the corresponding groove of the worm, and measure the distance of the measuring rod with a micrometer of the common line method to check the pitch diameter of the worm. The measuring rod diameter d0 and the measuring distance M are generally determined by the technical data of the worm pattern. The sensitivity of this method is 3~4 times higher than that of tooth thickness caliper. Analysis of Worm Milling Quality The accuracy of the worm milled by the disk milling cutter on the milling machine is relatively low. The main reason is that the tooth profile of the milling cutter deviates from the tooth profile of the worm, and there is interference in the processing of precision parts, which will also cause the error of the tooth profile, which will lead to milling quality problems and causes.

Defect repair on machine tool castings: The results of repairing defects on machine tool castings by several traditional welding repair processes are analyzed to determine the reasons for the poor repair results on machine tool castings. By studying the repair results of casting defect repair machines in machine tool castings, a new technology and its process for repairing on machine tool castings is determined to be indeed feasible. Using the casting defect repair machine to repair the defects of the casting, the casting in the repair process, no heating, no deformation, no crack generation, dense metal welding patch point, no hard spot, no annealing phenomenon, can be any mechanical processing. The selection of patching material is not constrained by the material, through the selection of different materials of patching material, the performance and color of the welded spot can be unified with that of the mother body.   The metallurgical bonding between the patch and the parent body, with high bonding strength and no shedding, is a new technology worthy of widespread promotion as the quality of the patch meets the quality inspection standards of the casting products. However, the welding patching range of casting defect repair machine is Φ1.5-Φ1.2mm welding patch repeatedly melting and accumulating process, in the process of large area defect repair, the repair efficiency is the only factor that restricts its widespread application. For large defects of machine tool castings, the composite application of traditional welding repair process and casting defect repair machine is recommended.

The vanishing mold casting process first of all eliminates the sand core and core making process, eradicates the casting defects caused by core making and core lowering, greatly reducing the generation of scrap; vanishing mold casting technology simplifies the sand processing system, the sand can be used repeatedly, eliminating the sand preparation and waste sand processing department, and also can be set in a more ideal location reasonable shape of the gate, and not subject to traditional factors such as parting and mold taking, etc. The casting process can not only complete the casting process, but also reduce the internal defects of the casting. The disappearing mold casting process can be applied to other places besides the box and shell castings. Due to the disappearing mold casting process like pyrolysis products will cause carbon increase, black slag and other defects, in the casting of low carbon steel castings and the requirements of very high density of automotive ductile iron security parts, the scrap rate is still relatively high, the choice should be particularly careful. The more complex the structure of the casting shape is particularly adaptable, and the more complex the structure, the more sand cores need to be used when the original sand casting, the greater the amount of machining of the casting, the superiority of the use of disappearing mold casting technology is more prominent, the more significant economic benefits.   The most critical point of the disappearing mold casting process reduces the smoke, dust and noise pollution, improving the working environment of the casting industry, but also reduce the labor intensity of the casting workers. At the same time, it also simplifies the process operation. The degree of technical requirements for the operating workers is greatly reduced. Casting is the foundation of the equipment manufacturing industry, the casting process is good or bad to determine the performance and quality of castings, directly affecting the level of operation and reliability of equipment. Although China is already a veritable power of casting, but the quality of casting products and the international advanced level there is a clear gap. Most of the product quality indicators there is a stage gap, imitation of more innovation less. Vanishing mold process of large castings industry in technology has experienced the introduction, digestion and absorption and reinvention of the development process, in all aspects of the process has accumulated a richer technical and professional production experience.   Casting industry outstanding enterprises in some aspects have a unique proprietary technology, thus forming their own core competitiveness. Large machine tool casting enterprises need to constantly accept the challenge of new materials and new processes.

The main forms of machining are: turning machining, milling machining, package machining and grinding machining. Traditional machining methods mainly include: turning, clamping, milling, planing, inserting, grinding, drilling, boring, punching, sawing and other methods. There are also electroplating, casting, wire cutting, forging, electro-etching, powder processing and so on. Turning: mainly processing shaft or rotary parts, through the turning of the tool to make it achieve the desired shape;   Milling: mainly processing plane, or bevel, through the milling cutter disc to remove the plane;   Planing: mainly for machining flat or curved surfaces, and removing the flat or curved surfaces by planing cutters;   Grinding: mainly by grinding wheel to grind the plane, external circle, internal circle to achieve the surface roughness;   Drilling: mainly by drilling holes with a drill;   Boring: mainly by boring the bore with a boring tool or insert.   Punching: Mainly by punching and forming;   Sawing: mainly by sawing machine cutting processing. If the product batch is large, it is recommended to use the lathe to bore, which is fast and accurate. Because it is clear angle, so the boring tool should also clear the angle in front;   If the product batch is small, use milling cutter milling but the speed is slower. Machining is a process of changing the size or performance of a workpiece with machining machinery. According to the temperature state of the workpiece being machined, it is divided into cold machining and hot machining. Machining at room temperature and without chemical or physical changes to the workpiece is called cold machining.   Generally at a higher or lower than room temperature state processing, will cause chemical or physical changes in the workpiece, called hot processing. Cold processing can be divided into cutting and pressure processing according to the differences in processing methods. Thermal processing is common with heat treatment, calcination, casting and welding.

Ultra-high-speed machining technology is a very important part of precision parts processing technology, because precision machining requires high accuracy and can only tolerate very small errors. So we have to focus on machine tool processing and super hard material above to solve these problems, by improving the machine tool's high precision processing capability to solve the material cutting speed and so on. So what is the ultra-high-speed machining skills, we will look at the following in detail.   Ultra-high-speed machining skills refers to the use of super-hard material cutting tools, after greatly improving the cutting speed and feed rate to improve the material removal rate, processing accuracy and processing quality of modern processing skills.   The cutting speed limitation of ultra-high-speed machining varies according to the different workpiece materials and different cutting methods. At present, it is generally believed that the cutting speed limit of ultra-high-speed cutting of various materials is: aluminum alloy has exceeded 1600m/min, cast iron is 1500m/min, super heat-resistant nickel alloy is 300m/min, titanium alloy is 150~1000m/min, fiber-reinforced plastic is 2000~9000m/min. The cutting speed limit of various cutting processes is: turning 700~7000m/min, milling 700~7000m/min, and machining speed limit is: turning 700~7000m/min. 7000m/min, milling 300~6000m/min, drilling 200~1100m/min, grinding 250m/s or more, etc. Ultra-high-speed machining skills include: ultra-high-speed cutting and grinding mechanism research, ultra-high-speed spindle unit manufacturing skills, ultra-high-speed feed unit manufacturing skills, ultra-high-speed machining tools and abrasives manufacturing skills, ultra-high-speed machining online active detection and control skills, etc.   Ultra-fine machining at that time refers to the dimensional accuracy of the machined parts is higher than 0.1μm, the appearance of the roughness Ra less than 025μm, as well as the machine tool positioning accuracy of the resolution and repeatability is higher than 0.01μm processing skills, also known as sub-micron processing skills, and is developing to nanometer-level processing skills.   Ultra-fine machining skills include: ultra-fine machining mechanism, ultra-fine machining equipment manufacturing skills, ultra-fine machining tools and sharpening skills, ultra-fine measurement skills and error compensation skills, ultra-fine machining task premise research.

Machining center CNC machining how the simplest tool, simply put, first to the X direction and then to the Y direction and finally to the Z direction steps are as follows. 1, first to the X-direction, take the right side of the tool oblique side gently touch down after gently lifting the tool along the Z-direction and clear the relative coordinates of the CNC machining center.   2, the tool to the left of the material, the tool and material gently touch, the tool will be lifted, which is to note down the X value of the relative coordinates of the machine tool, the tool will move to the relative coordinates of X half, note down the X value of the absolute coordinates of the machine tool, and press (INPUT) input the coordinate system can be (some systems by measurement can also be) Fa Na can system by "measurement "can also be to the Y direction;.   3, with the tool in front of the material touch down, tool and material gently contact, the tool will be lifted along the Z direction, the relative coordinates of the machine to zero. 4, the tool mentioned behind the material, the tool and material gently contact, the tool will be lifted, which is to note the Y value of the relative coordinates of the machine tool, the tool moved to half of the relative coordinates Y, note the Y value of the absolute coordinates of the machine tool, and press (INPUT) input the coordinate system can be method that can be the system according to "measurement" can also Z to the tool Method of CNC milling machine Z to the tool will move the tool to the workpiece to Z to the zero point of the surface, the tool and the surface of the light contact, write down the machine tool at this time in the coordinate system Z to the value, input to the corresponding coordinate system.

1. At work   (1) The operator should operate in accordance with the requirements of the regulations, such as to leave the machine, then the gas source should be turned off, power supply, can not leave the machine in an unoccupied state.   (2) The machine tool should not be overloaded, over performance use.   (3) tools, workpieces, etc. should be correctly clamped, and clamping should be firmly, can not be heavy hammering.   (4) drive and feed mechanism, to check whether it can work properly.   (5) Tools and abrasives should be kept sharp, if they become blunt, or broken, they should be replaced immediately.   (6) Safety guards can not be removed at will, if not the device, the machine can not be used.   (7) The machine should not be put on the tools, workpieces or other debris.   (8) machine operation, should always pay attention to, if there are abnormalities should immediately stop to check.   (9) The machine should be kept clean, clean. 2. After work   (1) operating handles, switches, etc., to be in the correct position.   (2) After the machine stops running, cut off the air supply and power supply.   (3) Clean the machine, clean the work site, and then carry out maintenance work on the machine.   (4) Do the job records and handover work.

1.CNC tool selection principles   Generally speaking, the life of the tool is closely related to the cutting amount, so in the development of cutting amount, the choice of the tool is very important. Tool life generally has the highest and lowest, the former is related to the single work hours, while the latter is related to the process cost.   When we consider tool life, it should be determined based on tool complexity, manufacturing cost, etc. If it is used for the operation of more complex multi-tool machinery and equipment, then it should be selected with high life and good reliability.   CNC tool, it is a kind of tool, it is higher than the ordinary requirements of the tool, not only need good rigidity, strength and precision, but also require dimensional stability and good durability. 2. CNC turning with the choice of tools   CNC turning tools, it generally has type turning tools, pointed turning tools and arc turning tools of these three categories. When we choose, should be combined with the characteristics of CNC machining, a comprehensive consideration, and also take into account the tool itself, in order to choose the most appropriate.   3. CNC milling tool selection   The main requirements for CNC milling tools are: sufficient rigidity, and can be used well. Therefore, we have to take these into consideration in order to choose the most suitable one.

1, touch through the bit, insert through the bit in the rear die projection bit to leave 0.02MM FIT die.   2、Processing can not have burrs, to ensure the smoothness, the requirements of tolerance must be achieved. (General overall tolerance of 0.010)   3、The pin hole should be processed according to the tolerance requirements.   4、Gates and runners are processed by machine tools (CNC, EDM) strictly according to the drawing size, and to ensure the finish, and manual processing by grinding machine and rough knife pattern are not allowed.   5、No unevenness, pits, rust and other defects affecting the appearance of the front and rear mold surface. Keep the parting surface clean and tidy, no dent in the sealing part, and ensure the precision. The surface of the front and back mold tendons and columns are free of spark patterns and knife marks, and polished as much as possible. The surface of the pinhole of the cylinder is finely stranded with a reamer, and there are no spark patterns and knife marks. 6、Is the depth of the exhaust slot less than the overflow edge value of plastic, less than or equal to 0.02mm, exhaust slot by machine tool processing, no manual grinding machine grinding traces.   7, cup head hole side unilateral negative 0.01MM --- 0.02MM, the bottom generally to do deep -0.02MM.   8, tigers matching unified after the die projection tigers unilateral negative 0.05MM, and to ensure that the plane, R angle to avoid empty.   9、Pillow bit light quasi-number, pillow bit and fractal surface out of 12.00MM outside the avoidance of hollow depth of 0.2MM or more, the plane can not avoid hollow.   10、Set block, set pin, etc. should be reliably positioned fixed, round pieces have a stop turn. No pad of copper or iron under the inlay, no welding is allowed for the inner mold workpiece and inlay. 11, the muzzle hole, sleeve hole, ejector hole are processed by wire cutting, and with the smooth. The end face of the top bar is consistent with the core.   12, waterproof rubber ring groove should be inverted around R0.3-R0.5mm small rounded corners, to avoid the rubber ring in the installation of mold crushing.   13、The parts of the mold should be numbered. The number does not allow manual processing with polishing machine, before and after the mold kernel available flat milling knife in the bottom of the reference angle position to step concave flat bit and then engraved word mark. The rest of the parts code CNC processing or etching processing. Require clear, beautiful, neat and evenly spaced handwriting.   14、 Must be processed in full accordance with the customer has confirmed the mold design, if there is any change, please inform the customer or project personnel in time.   15、 Please keep the surface of the mold embryo clean and free from any scratch marks, no random knocking.

1、It is easy to ensure the accuracy of each processing surface of the workpiece. When processing the active lathe, the workpiece reverses around a fixed axis, and each appearance has the same reversal axis, so it is easy to ensure the demand of coaxiality between processing surfaces. 2、The cutting process is relatively smooth. In addition to the intermittent appearance, usually the lathe processing process is continuous, unlike milling and planing, in a walk to the process, the teeth have repeatedly cut into and cut out, the impact.   3、Applicable to the finishing of non-ferrous metal parts. Some non-ferrous metal parts, because the material itself is low hardness, plasticity is good, with other processing methods is difficult to get a bright appearance. 4, the tool is simple. Turning tool is one of the most simple tools, production, sharpening and installation are very convenient, which is convenient according to the detailed processing needs, the choice of a reasonable point of view.   5、The tool is simple. Turning tool is one of the simplest tools, manufacturing, sharpening and installation are very convenient, which makes it easy to choose a reasonable angle according to the specific processing requirements.