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

Surface treatment process for precision parts The surface treatment process for precision parts is a crucial step in enhancing their performance, durability, and aesthetics. This meticulous procedure involves a series of steps that ensure the desired surface qualities are achieved. Firstly, the precision parts undergo a thorough cleaning process to remove any residual dirt, grease, or oxides. This ensures a clean and smooth surface, ready for the next stages of treatment. Next, the surface is prepared for coating or finishing. This may involve abrasive blasting, chemical etching, or other methods to achieve a uniform and suitable surface texture. After preparation, the precision parts are coated with a protective layer, such as paint, powder coating, or plating. This layer not only enhances the part's aesthetics but also provides protection against corrosion, wear, and other environmental factors. Finally, a finishing process is applied to smoothen the surface and eliminate any imperfections. This may include polishing, buffing, or other techniques that give the precision parts a high-quality, professional finish. In conclusion, the surface treatment process for precision parts is a meticulous and essential step in ensuring their optimal performance and durability. By following these steps, manufacturers can produce precision parts that meet the highest standards of quality and reliability.

Parts in the process of processing, due to the influence of various factors, easily lead to its own existence of certain defects, such as the appearance of substandard, limited scope of use, etc.. The existence of these defects will inevitably bring certain problems to the use of parts, in order to overcome these problems and give full play to the unique value of the parts, precision parts machining is the better choice. The choice of precision parts processing, not only can effectively improve the quality of materials, parts precision, play its function, but also can make the durability of the parts greatly improved, and promote the quality of the entire machinery to improve. Precision machining is also good for improving the dimensional accuracy of the parts, so the most direct effect is that it can make the parts reach interchangeability, which in turn increases the wear resistance and service life of the parts.   It is because of all these advantages that precision machining of parts is so popular, and there are more suitable areas to be used in the assembly of equipment, so that its value can be better played. Thus, it is important to pay attention to the precision parts processing. After the processing of different parts we can get more suitable for their own parts, so in order to make these products better for their own service, to play its ultimate value, so many people are less precision machining this important link  

As we all know, the reason why the processing of precision parts is called precision machining, precisely because of its processing procedures and process requirements are very high, the precision requirements of the product is very high, and the precision of the processing of precision parts contains the accuracy of the location, size accuracy, shape accuracy, etc., Rui Sheng Technology General Manager combined with the company's more than 10 years of production and processing experience for us to summarize the following impact on the precision of precision parts processing Factors. (1) the machine tool spindle rotation runout can produce a certain error on the machining accuracy of the parts.   (2) the accuracy of the machine tool guide inaccuracy can also lead to precision parts processing workpiece shape error.   (3) transmission components can also lead to errors in the processing of the workpiece, which is also the most important factor in the production of the workpiece surface error.   (4) tool, fixture type of different will also have different degrees of impact on the accuracy of the workpiece processing.   (5) In the process of machining and cutting due to changes in the location of the force point will lead to deformation of the system, resulting in differences, which can also make the accuracy of the workpiece to produce different degrees of error. (6) The size of the cutting force is different, which can also lead to the accuracy of the workpiece being affected.   (7) the process system by heat deformation caused by the error, machining process, the process system will be in the role of various heat sources to produce a certain amount of thermal deformation.   (7) process system deformation caused by heat often leads to the accuracy of the workpiece is affected.   (8) The deformation of the machine tool by heat will lead to the deformation of the workpiece.   (9) Heat deformation of the tool can have a great impact on the workpiece.   (10) The workpiece itself is deformed by heat, mainly in the cutting process.

Parts processing process is a direct change in the appearance of raw materials (shape, size, location, performance), so that it becomes a semi-finished workpiece or finished process, the process we call the process, that is, the parts of the processing process benchmark, precision parts processing process is more complex. Precision parts processing process benchmark can be divided into different processes: casting, forging, stamping, welding, heat treatment, machining, assembly and so on categories. Precision parts processing process generally refers to the entire part of the CNC machining and machine assembly process in general, and other such as cleaning, inspection, equipment maintenance, oil seals, etc. are only auxiliary processes. Turning methods to change the surface properties of raw materials or semi-finished products, this process we call the CNC machining process, precision parts processing industry in the CNC machining process is the most important process. The following is a detailed introduction to the CNC precision parts machining process benchmark   (1) positioning datum, the positioning datum used by the lathe or fixture in the CNC lathe for processing.   (2) measurement benchmark, this benchmark usually refers to the size or position of the standard to be observed during inspection.   (3) assembly benchmark, this benchmark we usually refers to the position of the parts in the assembly process standards.

Cutting processing is roughly divided into turning, milling and cutting (drilling, end mill end cutting, etc.), the cutting heat of these cutting processes on the tip of the cutting edge is also different. Turning is a continuous cutting, the cutting force at the tip of the cutting edge does not change significantly, the cutting heat acts continuously on the cutting edge; milling is a kind of intermittent cutting, the cutting force is intermittent on the tip of the cutting edge, cutting vibration will occur, the tip of the cutting edge is affected by the heat, is alternately heated when cutting and non-cutting cooling, the total heat is less than when turning. The cutting heat during milling is a kind of intermittent heating phenomenon, and the tool teeth are cooled during non-cutting, which will contribute to the extension of tool life. Japan Institute of Physical and Chemical Research of turning and milling tool life for comparative testing, milling tools used for ball end mill, turning for general turning tools, both in the same processed materials and cutting conditions (due to different cutting methods, depth of cut, feed, cutting speed, etc. can only be roughly the same) and the same environmental conditions for cutting comparison test, the results show that milling processing to extend tool life is more The results show that milling is more beneficial to prolong the tool life. When cutting with tools such as drills and ball end mills with a central edge (i.e., the part with cutting speed = 0 m/min), the tool life near the central edge is often low, but it is still better than when turning. In cutting difficult to machine materials, the cutting edge is affected by heat, often reducing tool life, cutting method such as milling, the tool life will be relatively long. However, difficult-to-machine materials can not be used from start to finish all milling, there will always be a need for turning or drilling in the middle of the time, therefore, should be for different cutting methods, take the appropriate technical measures to improve processing efficiency.

In the middle of the 20th century, when the Soviet Lazarinkov women studied the phenomenon and causes of corrosion damage to switch contacts by spark discharge, they found that the instantaneous high temperature of electric spark could make the local metal melt and oxidize and be corroded away, thus creating and inventing the electric spark machining method wire-cut discharge machine was also invented in the Soviet Union in 1960. At that time, a projector was used to view the contour before the left and right manual feed to the table for processing, and it was thought that the processing speed was slow, but it could process the fine shapes that were not easily processed by conventional machinery. A typical practical example is the processing of shaped holes by chemical weaving nozzles. The processing fluid used at that time was mineral oil (lamp oil). Because of the high insulation and small distance between poles, the processing speed was lower than that of the current machine, and the practicality was limited. The first machine to be NC-educated and processed in deionized water (close to distilled water) was exhibited at the 1969 Paris Workhorse Exhibition by a Swiss electrical discharge machine manufacturer, which improved the processing speed and established the safety of unmanned operation. However, the production of NC paper tape was very laborious, and it was a great burden to the user if it was not programmed automatically by a large computer. Until the advent of inexpensive Automatic Programed Tools (APT), the popularity was slow. The Japanese manufacturer developed a small computerized automatic programmed wire-cutting EDM machine, which is cheap and accelerated the popularity. The processing shape of WEDM is a quadratic profile. The emergence of the simple APT (APT language is easier than the official model) was an important factor in the development of WEDM machines.

The arrangement of the machining sequence should be considered according to the structure of the part and the condition of the blank, as well as the need for positioning and clamping, the heavy - point is that the rigidity of the workpiece is not destroyed. The sequence should generally be carried out according to the following principles. (1) the processing of the previous process can not affect the positioning and clamping of the next process, interspersed with general-purpose machine tool processing process should also be considered.   (2) first inside the shape of the cavity plus process, after the shape of the processing process.   (3) to the same positioning, clamping or the same knife processing process is best - the best connection to reduce the number of repeated positioning, the number of times to change the knife and move the platen times.   (4) For multiple processes in the same installation, the process with less rigid damage to the workpiece should be arranged first.

Hardware processing accounts for a large part of precision parts processing. Casting properties: refers to whether the metal or alloy is suitable for casting some process properties, mainly including flow properties, the ability to fill the casting mold; shrinkage, the ability of volume shrinkage when the casting solidifies; deviation refers to chemical composition unevenness.   Welding performance: refers to the metal material by heating or heating and pressurized welding method, two or more metal materials welded together, the interface can meet the characteristics of the purpose of use.   Top gas section performance: refers to the performance of the metal material can be granted top forging without rupture. Cold bending performance: refers to the metal material at room temperature can withstand bending without rupture performance. Bending degree is generally used to bend the angle α (outer angle) or bending center diameter d to the material thickness a ratio, a the greater or d / a smaller, the better the cold bending of the material.   Stamping performance: the ability of metal materials to withstand stamping deformation processing without rupture. Stamping at room temperature is called cold stamping. The test method is to test by cupping test.   Forging performance: the ability of the metal material to withstand plastic deformation without rupture during forging processing.

For precision parts, the processing is very strict, the processing process has a tool in, tool out, etc.. There are specific requirements for size and precision, such as 1mm plus or minus how many microns, etc. If the size is wrong too much will become scrap, which is equivalent to having to re-process, time-consuming and laborious, and sometimes even makes the entire processing material scrap, which causes an increase in costs, and at the same time, the parts are definitely not available. So precision parts processing in the end to follow what standards and requirements? For precision parts processing is mainly dimensional requirements, such as how much the cylindrical diameter, there are strict requirements, positive and negative error within the specified requirements to be qualified parts, otherwise they are unqualified parts; length, width and height also have specific strict requirements, positive and negative error is also specified, such as an embedded cylinder (take the most simple basic parts for example), if the diameter is too large, more than the error allowed range, it will Caused by, insert not into the situation, if the actual diameter is too small, more than the lower limit of the negative value of the error allowed, it will cause inserted too loose, not solid problems occur. These are unqualified products, or the cylindrical length is too long or too short, beyond the error tolerance range, are unqualified products, are to be scrapped, or re-processed, which will inevitably cause an increase in costs.   Precision parts processing requirements is in fact the main size problem, must be strictly in accordance with another plus drawings for processing, processing out of the actual size will certainly not be the same as the theoretical size of the drawings, only, as long as the processing size within the error tolerance is qualified parts, so the requirements of precision parts processing is in strict accordance with the theoretical size for processing. Second is the advanced precision parts processing equipment and testing equipment, advanced processing equipment makes processing precision parts easier, higher precision, better results. Testing equipment can detect the parts that do not meet the requirements, so that all the products sent to customers really meet the requirements.

Turning threads is one of the most common processes for turning parts, so this article is an example of a common fault and solution for turning threads. When turning threads, there are various reasons for problems in the movement between the spindle and the tool, which may cause a fault when turning threads and affect normal production, and should be resolved in a timely manner. The following is a list of common failures and solutions. 1、Rough surface of thread   Failure analysis: The main reason for this problem is that the cutting edge of the turning tool is not smooth enough, the cutting fluid and cutting speed do not match the processed material, or the vibration generated during the cutting process.   Solution: Fine study the tool with oil or grinding wheel, choose the matching cutting fluid and cutting speed, adjust the position of various parts, and ensure the accuracy of each guide gap, so as to prevent the vibration generated during cutting.   2、Gnawing tool   Failure analysis: mainly due to the incorrect location of the turning tool installation, either too high or too low, and the workpiece clamping is not solid, the turning tool wear is too large   Solution: adjust the height of the turning tool, so that the tool tip and the axis of the workpiece is equal to the height   3、Random buckle   Failure analysis: The reason is that when the screw rotates for a week, the workpiece is not installed over the whole number of turns and caused. Solution.   (1) When the ratio of lathe screw pitch and workpiece pitch is not an integer number, if the bed saddle is swung to the starting position by opening the opening and closing nut when the tool is retired, then when the opening and closing nut is closed again, the turning tool tip will not be in the spiral groove turned out by the previous tool, resulting in a messy buckle. The solution is to use the positive and negative turning method to return the tool, that is, at the end of the first stroke, do not lift the opening and closing nut, the tool along the radial exit, the spindle will be reversed, so that the turning tool along the longitudinal return, and then the second stroke, so that the reciprocating process, because the transmission between the spindle, screw and tool holder has not been separated, the turning tool is always in the original spiral groove, there will be no messy buckle.   (2) For threads where the ratio of the screw pitch to the workpiece pitch of the turning lathe is an integer number of times, the workpiece and the screw are rotating, and after lifting the opening and closing nut, at least wait for the screw to turn one turn before closing the opening and closing nut again, so that when the screw turns one turn, the workpiece turns an integer number of times, and the turning tool can enter the spiral groove turned out by the previous tool, so that there is no messy buckling. This way, the tool can be manually retired by opening the opening and closing nuts. This is a fast retreat, which is conducive to improving productivity and maintaining the accuracy of the screw, while the screw is also safer. 4、Pitch is not correct   Failure analysis and solutions.   (1) Improperly matched hanging wheel or incorrect feed box handle position, resulting in incorrect thread length, can re-check the feed box handle position or check the hanging wheel.   (2) The local incorrectness is due to the local error of the pitch of the lathe screw itself, so the screw can be replaced or partially repaired.   5、The middle warp is not correct   Failure analysis: The reason is that the eating tool is too big and the dial is not allowed, and it is not measured in time.   Solution: Check in detail whether the dial is loose when finishing, the finishing margin should be appropriate, the cutting edge of the turning tool should be sharp, and the measurement should be made in time.