Yearly Archive September 17, 2020

With the continuous updating of the times, our requirements for products are also higher and higher. We must require the products to meet the standards or appearance. Dongguan automatic parts processing is one of them. What are the technical requirements for automatic parts processing?

1： When installing the hydraulic system, it is allowed to use sealing filler or sealant, but should avoid entering the system.

2： The parts and components entering the installation can be installed only with the certificate of inspection part.

3： The unmarked shape service shall meet the requirements of gb1184-80, and the allowable error of unmarked length shall be ± 0. 5mm。

Dongguan automatic parts processing

4： For fasteners with regular tightening torque, it is necessary to select torque wrench and tighten according to regular tightening torque.

5： Before assembly, strictly check and remove the residual sharp angle, burr and foreign matters during the processing of parts. Ensure that the seal will not be scratched during installation.

6： It is necessary to clean and clean the parts before installation, and there shall be no burr, flash, oxide scale, rust, chip, oil stain, colorant and dust, etc.

7： After the bearing outer ring is installed, the end face of the bearing cover at the positioning end shall be evenly touched. There shall be no scratch, scratch and other defects on the surface of the parts.

With the demand of our industry, is constantly increasing, is constantly changing, to our use and all aspects, have changed a lot, the emergence of some processing, not only reduce the labor intensity, but also improve our production efficiency, Tangxia precision hardware processing is the same, so the main application of precision hardware processing lathe parts in some?

Precision hardware processing automatic lathe can reduce the labor intensity of workers, shorten the auxiliary time, and can be supervised by one person for multiple machine tools, with high productivity. In recent years, the function of the international discharge machine bed has been constantly innovated, and the industry has been developing towards precision and automation. The products are used in the processing of small and medium-sized metal parts, which is more labor-saving. For example, it can be used in the field of high-speed wire cutting machine and slow wire cutting machine for processing various types of metal semi-finished products. Thailand, Indonesia, Malaysia and other countries have a large demand for various metal products and semi-finished products. The labor cost in these areas is low, and the number of various factories is large, and the demand for discharge machine bed is considerable. The operators pointed out that the Southeast Asian market has a large demand for discharge machine beds. Manufacturers should continue to strengthen research and development, improve machine performance, especially precision and durability, and strengthen after-sales service. In addition, using computer to control the discharge machine bed is one of the directions worthy of efforts. Precision hardware processing automatic lathe parts are small in diameter, generally less than 16mm in diameter. Its model is lhs21, and its materials are iron, copper, stainless steel, aluminum, magnesium and titanium. Automatic lathe parts are suitable for processing diameter of ￠ 0.25mm – ￠ 42.0mm, and processing length of 2mm-230mm. This material is easy to turn and has simple shape. Large quantities of rotary workpieces, such as small shafts, gaskets, etc., are mainly used in large quantities of small and medium-sized workpieces. The workpieces have high precision arc, taper, and high shape and position requirements. It is characterized by high efficiency and high precision, and can be operated by one person with multiple machines.

Before grinding, it is necessary to inspect the grinding wheel. If the grinding wheel is found to run out, the cylindrical surface is irregular, and the fillet is too large, it is necessary to repair it. Generally, the cylindrical surface of grinding wheel can be trimmed by wheel corrector (diamond dresser, gear wheel dresser, etc.), and the worn-out grinding wheel with relatively high hardness can also be used for dressing. If the side plane of the grinding wheel is still uneven, the grinding wheel can be replaced.

End face grinding technology of end mill:

Technology of grinding end face of end mill

No matter how many edge end mills, first of all, the end face of the cutting edge should be vertical to the axis, which is to ensure that the cutting edge can be in the same plane with respect to the high point. To correct the perpendicularity of the end face of the cutter with respect to the axis of the milling cutter is as follows.

① Visual inspection. With the help of a flat plate, the edge of the end mill can be lowered on the flat plate to watch the skew angle controlled. Then turn the milling cutter 180 ° and watch its control skew angle. If the skew angle difference is observed twice on the same target, it needs to be polished until the same skew angle is observed twice on the same target. Then turn the milling cutter 90 ° and repeat the above actions.

② Correct with a square. Correct with a 90 ° right angle square on a flat plate. After leveling the milling cutter and square, check whether there is a gap between the milling cutter and the square or whether the clearance is average. Thus, it is possible to infer the perpendicularity of the milling cutter, as shown in Fig. 1.

③ Self correction. Clamp the end mill on the chuck of drilling machine or milling machine, place a waste grinding wheel under it, select appropriate speed to start the machine tool, and then move down the milling cutter to grind on the grinding wheel, and grind according to the end face grinding condition.

Technology of cutting cross chip removal groove for end mill

If there is no circular groove in the front of the end eye of the four blade end mill, it is necessary to use the fillet of the grinding wheel to re open the cross groove along the spiral groove target of the milling cutter, and control the depth of 1-2mm (if it is too deep, it is easy to crack, if it is too shallow, it is not easy to grind out the rear corner of the pair). When slotting, pay attention to the side of the grinding wheel to avoid suffering from another blade under it (Note: this cross groove has the function of chip removal. If it does not open, the inclination angle of the edge concave into the middle should be increased).

Edge grinding technology of end milling cutter cutting edge

① When grinding each edge, take the tip of each blade as the benchmark and keep the edge tip as the principle. Grind the front angle (if there is no chipping edge, it is better not to grind), the back angle, the auxiliary back angle (if the cutting amount is large, it is suggested to increase the wedge angle in front of the grinding tool) and the edge inclination angle.

② The selection of the relative angle is 6 ° to 8 ° for the back angle and 1 ° to 3 ° for the edge angle. ? the selection of the back angle depends on the hardness of the workpiece. If the hardness of the raw material is large, the angle will be smaller. The selection principle of the angle of the edge angle is that all four edges must be concave into the middle. The smoother the angle, the better the roughness accuracy. At this time, the deeper the machining depth is (if it is greater than 2 mm, but it should be within the allowable limit), the roughness accuracy will be better, because the whole cutting edge is added with the cutting effect.

③ After grinding, the milling cutter is erected on a platform. If the axis is vertical, all the edge points can be even, and the deviation angle of the cutting edge can be even, so it can meet the requirements.

At this time, it is also advisable to use a 90 ° square on a flat plate for correction. After leveling, check whether there is a gap between the milling cutter and the square or whether the clearance is average. Usually watch two relatively high feet first (the two feet touching the bottom first). If they are not vertical, grind the higher feet so that the two opposite feet are the same height (i.e. vertical). At this time, there is a height difference between these two feet and the other two opposite feet, and the milling cutter will swing. At this point, grind the two higher feet down at the same time. Similarly, turn the milling cutter 90 ° to observe the perpendicularity of the other two opposite feet, and finally make the four feet touch the bottom at the same time and make the milling cutter vertical. Milling cutter after grinding.

In manual sharpening, it is not easy to master the height and angle of the blade. In practice, it is necessary to vary from person to person. As long as you pay attention to grinding out a little back angle, you may as well. In addition, if it is not the condition of machining inner cavity angle cleaning, you may as well grind the chamfering greater than 0.2mm at the tool tip to increase the strength of the tool tip.

Grinding technology of main edge (side edge) of end mill

If the main edge of the end mill is worn, it is necessary to grind it along the spiral line on the grinding wheel (the diameter of the grinding wheel is smaller, better). However, there is usually taper after grinding. The smaller the taper, the higher the control level.

For the quality of processing, it depends on what factors, including many, may be the processing method, may also depend on the material, these are possible, automatic parts processing is the same, then the quality of automatic parts processing depends on what reason?

The quality of the machine depends on the processing quality of the parts and the assembly quality of the machine. The machining quality of the parts includes the machining accuracy and the surface quality of the parts. The machining accuracy refers to the degree to which the actual geometric parameters of the parts are consistent with the ideal geometric parameters. The difference between them is called machining error. The size of machining error reflects the level of machining accuracy. The larger the error is, the lower the machining accuracy is, the smaller the error is, the higher the machining accuracy is; the main factors affecting the machining accuracy are: dimensional accuracy, the conformity between the actual size of the part after processing and the tolerance zone center of the part size.

The machining error of Automatic Parts reflects the machining accuracy. The larger the error is, the lower the machining accuracy is, the smaller the error is, the higher the machining accuracy is; the main factors affecting the machining accuracy are: dimensional accuracy, the conformity between the actual size of the part after processing and the tolerance zone center of the part size. Compared with the method of producing parts with die casting die, it avoids the uneconomical of opening the die when manufacturing small batch parts, and shortens the production cycle greatly. At the same time, the correct clamping and positioning and reasonable processing technology make the processed parts have high precision and surface finish, which is not achieved by die casting process. Moreover, the density of extruded aluminum profile is higher than that of die casting. In addition, this method is different from the general single part machining production, it can batch produce a bed of parts. If the working table of the machine tool is large enough, the bottom plate can be made larger, and several aluminum materials can be arranged at a time, then the processing efficiency can be further improved and the number of tool changes is relatively reduced. If there are features on the side of the part to be processed, such as a round hole to be drilled, then after the part is cut off on the B side, the fixture shall be manufactured and the part shall be assembled for further processing