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

Stainless steel precision parts processing process to improve the finish of the parts, there are many factors affecting the lathe, materials, tools have an impact. General machine tools can reach Ra1.6, processing aluminum precision high-speed machine tools can reach Ra0.2. The main thing here is that the parts fold is difficult to deal with, there are more factors, if you are a long shaft class, perhaps the tailstock top force is not enough, or the tailstock is moving, if there is no problem with the tailstock, tool wear, including processing parameters, cutting fluid and other aspects of the problem.   There is also the material of stainless steel precision parts processing, corresponding to the choice of tools. In addition, including the machine tool itself, this only in practice to find out to solve the problem. Alone, there is no way to solve the problem, but also need to explore other reasons.   In fact, the main reason is because of the problem of stainless steel precision parts processing strength, it is possible that the length of your processing parts probed too long, or the length of your tool is too long. The center of the tool is high. Choose the right tool. There is too high a rotation speed caused by the resonance of the machine tool and the part tool will also appear pattern. To first ensure the stability of the lathe is good is the lathe fixed situation is good. Then is the spindle will not jitter when running at high speed, followed by coolant is very important then is your tool to grind well, as well as chip groove to open well, to prevent poor chip out of the workpiece scratch, as well as the turning tool chamfering made of rounded corners, in addition is to install the tool when not to resist the knife. Is to match the spindle speed and the speed of the tool, if your lathe work is not very good, it is recommended to buy some sandpaper to get, in the sandpaper to get the time recommended according to the direction of the work of the turning tool processing, so that the stainless steel precision parts processing out of the grain better look some.

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 kind of wear is generally slow to develop and has little impact on the machining quality in the short term.   Hard particle wear is due to the parts themselves fallen abrasive particles or by the outside world into the machine tool hard particles, 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.   Surface fatigue wear is machinery in the role of alternating load, produced a small crack or class point-like crater, thus causing damage to the parts. This type of wear is usually closely related to the pressure size, load characteristics, machine material, 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.

Precision parts machining is to complete a variety of processes in the automatic state of the CNC equipment, mainly on some fixed high-volume consumption operations. But on the mold industry and small quantities of consumer units should not move on the machining center, many manufacturers buy machining center as CNC milling to use. The use of tool magazine on the cost of CNC system is very simple, but the spindle and tool magazine, air compressor and a variety of tool shanks, etc. will increase the cost, and programming, adjusting the tool magazine also to break the corresponding time. Therefore, on the consumption of the same type of less than one or two hundred workpieces try not to use the machining center, high cost, low efficiency.   Precision parts processing can be used to fully automatic tooling system, knife up a load, a button, the machine automatically to the knife, direct processing, error in 0.001 ~ .0003mm, and automatic time change to compare, not much slower. If it is a fine parts processing center, but no automatic tooling installation of the machine tool and without the tool magazine, but with automatic tooling installation compared to the machine tool, the efficiency of the latter in theory is much higher than the former. On the domestic manufacturing industry, especially on the mold consumption enterprises, the general are single-piece consumption, and sufficient labor resources, so, on the processing of small quantities of industrial parts, to give full consideration to the application value of funds, do not readily use machining center equipment. What's more, there are still many problems with the tool magazines of domestic manufacturers at all.

In large gantry cnc machining operations, the relative positions of the spindle and the rotary axis are kept relatively fixed. Actual production and theoretical knowledge are not exactly the same. The relative spatial position between the two axes need not be relatively fixed. This is because the bearing components that make up the spindle may have different degrees of error in the production plant where the lathe equipment is manufactured, and will be affected by conditions such as temperature, working intensity and lubrication in the course of use Due to the different precision of spindle bearings, different quality of manual assembly of spindle box, runout caused by mechanical vibration during the machining of spindle and rotating parts, unstable roundness of bottom shaft bearing journals during the manufacturing process, spindle will produce certain thermal deformation and concentricity error during the operation. All these factors will affect the geometric accuracy of the CNC lathe spindle.   In large gantry cnc machining operation, the relative position of the spindle and the rotary axis is kept relatively fixed. Actual production and theoretical knowledge are not exactly the same. The relative spatial position between the two axes need not be relatively fixed. This is because in the production plant where lathe equipment is manufactured, the bearing components that make up the spindle may have different degrees of error and will be affected by conditions such as temperature, working intensity and lubrication during use.   Due to different precision of spindle bearings, different quality of manual assembly of spindle box, runout caused by mechanical vibration during processing of spindle and rotating parts, unstable roundness of bottom shaft bearing journals during manufacturing process, spindle will produce certain thermal deformation and concentricity error during operation. All these factors will affect the geometric accuracy of the CNC lathe spindle. In addition to the geometric accuracy errors generated by the spindle in gantry cnc machining, the trajectory may also affect the position accuracy of the machine tool due to the friction and inertia matching of the servo motor in gantry cnc machining. Gantry cnc machining some parts that require uninterrupted work, such as cylinder pumps, electric motors, hydraulic machines, etc., need to work continuously for a long time (even 24 hours).   During the working process, friction deforms certain internal parts due to thermal expansion and deformation due to machining heat, which leads to deviations between the actual production size of the part and the intended size of the design. CNC lathe equipment parts due to internal heat asymmetry, resulting in the production of processing parts deformation, so the thermal deformation of CNC lathe equipment parts will have a critical impact on the position accuracy of the machine tool.   The machining accuracy of large gantry cnc machining is closely related to the geometric accuracy of the entire gantry cnc machining. It is also related to the transmission system failure, fault compensation system, machine tool structure friction, tool position error, etc. of CNC lathe machining. It is related to whether the editing of CNC lathe machining program is correct and whether the production process is reasonable. Therefore, in actual production, in order to improve the machining accuracy of CNC lathe, the geometric accuracy and position accuracy of CNC lathe must be improved.

Shenzhen CNC lathe processing is a high-precision, high-efficiency automated machine tools with digital information to control the parts and tool displacement of mechanical processing methods. It is an effective way to solve the problems of variable varieties, small batches, complex shapes and high precision of aerospace product parts, etc. and to achieve efficient and automated processing. Programming skills Because of the high precision requirements of CNC lathe manufacturers for processed products, the following matters need to be considered when programming. 1. Parts processing order.   Drilling first, then flush (this is to prevent shrinkage when drilling).   Rough turning first, followed by fine turning (this is to ensure the accuracy of the part).   Machining tolerance is large, while the primary machining tolerance is small (this is to ensure that the surface of the small tolerance size will not be scratched and to prevent the deformation of the part).   2. According to the hardness of the material to choose a reasonable speed, feed and depth of cut.   (1) carbon steel materials to choose high-speed, high feed, deep cutting. For example: 1Gr11, choose S1600, F0.2, depth of cut 2mm; (2) choose low speed, low feed and small depth of cut. For example: GH4033, select S800, F0.08, depth of cut 0.5mm.   3) Select low speed, high feed and small depth of cut for titanium alloy. For example: Ti6, select S400, F0.2, depth of cut 0.3mm. take the part machining as an example: the material is K414, which is a special hard material. After several tests, the final choice is S360, F0.1 and depth of cut 0.2, and then the qualified parts can be machined.   Second, the knife art   The tool is divided into tool gauge and direct tool. Most of the lathes in our factory without tools, for, the following technology.   First, select the center of the right end face of the part as the tool point and set it as the zero point. After the machine returns to the home position, each tool that needs to be used has the center of the right end face of the part as the zero point. By entering Z0 and clicking on the right end of the measuring tool, the tool automatically records the tool's repair value, which means that the tool's Z axis is good, the X tool is trying to cut the tool, and the tool is turning fewer cylindrical parts.   The value x20 (for example, X 20 mm) of the car cylinder as input for measurement, click on the measurement, the tool repair value will automatically record the measured value, and then the X axis is good; this method, even if the machine is powered on, call restart still does not change the value of the knife, can be applied to a large number of long production of the same part, during the lathe shutdown does not need to re-knife. Three, debugging skills   Various parts of the program, want to learn to program and did not find a way to add qq group can provide you with help, please try to debug well before debugging to prevent errors and mistakes on the knife, resulting in a crash, should be in the march simulation processing, advanced and unconstrained style in the machine tool coordinate system in the face of the cutting tool to the right part of the overall translation of the total length of the piece 2-3 times.   Then start simulation processing, after simulation processing to confirm that the program and knife is correct, and then start processing parts, part processing is completed, the first self-test, to confirm qualified, and then look for full-time inspection, to confirm the full-time inspection after passing, it means the end of debugging.   Fourth, the completion of parts processing   Parts of the sub-trial cutting is completed, the upcoming mass production, but not equal to the whole batch of qualified parts of the parts will be qualified, because in the processing process, due to the different processing materials can make the cutting tool wear, processing of soft materials, tool wear is small, processing materials hard, tool wear fast, so in the processing process, regular periodic inspection, timely increase and reduce the value of knife repair, to ensure that parts qualified.   Take the part as an example, the machining material is K414, the total length of machining is 180mm, because the material is particularly hard, the tool wear in machining is very fast, from beginning to end, because the tool wear will produce 10 -20mm, therefore, we must artificially increase 10-20mm in the program to ensure the quality of the part.   In conclusion, the basic principles of machining are: rough machining to remove excess material from the workpiece, then finishing; vibration should be avoided during machining. Avoid thermal degeneration during the machining of the workpiece. Vibration can be reduced due to a variety of causes, which may be excessive load; it may be resonance between the machine tool and the workpiece, or it may be caused by the lack of rigidity of the machine tool, or by dulling of the tool by Reducing lateral feeds and machining depths and checking.

Shenzhen precision parts processing there are materials good processing, some materials are difficult to process, like stainless steel, heat-resistant steel, titanium alloy are difficult to process materials, but these materials have many advantages due to its wide range of applications in the machining industry, used to manufacture a variety of precision parts. Based on these circumstances, higher requirements are put forward for cutting and machining technology. As we all know, there are two main ways to achieve precision parts processing in Shenzhen: one is to use high precision machine tools, such as CNC lathes, milling machines, etc., to achieve precision machining; the other is to explore new processing technology on the basis of traditional processing, improve the processing properties of materials, improve the precision and efficiency of precision mechanical parts processing.   In ordinary cutting, accompanied by chip formation, due to the extrusion and friction between the chip and the tool, will inevitably produce larger cutting forces, higher cutting temperatures, so that the tool wear and produce harmful phenomena such as cutting vibration, but cutting vibration also has its beneficial side: cutting power can be reduced by 15-30% under certain conditions, chip shrinkage is significantly reduced, improving the formation conditions of cutting, get broken chips, etc. Based on this idea, a new cutting method - vibration cutting, vibration cutting is by applying some kind of regular and controlled vibration on the cutting tool, so that the cutting speed and depth of cut change periodically, so as to get a special cutting effect method. Vibration cutting changes the spatial-temporal conditions between the tool and the material of the precision parts to be processed, thus changing the mechanism of precision machining, to reduce the cutting force, cutting heat, improve the quality and efficiency of processing.

CNC machining refers to machining with CNC machining tools, which has great advantages over manual machining tools. For example, the parts produced are very precise and repeatable; CNC machining can produce parts with complex shapes that cannot be done by manual machining. CNC machining technology is now widely promoted. But in practice, there are often CNC machining parts are always sticky knife situation, how to solve this situation? The following follow Shenzhen cnc machining factory Xiaobian to see it! 1, can be better sharp tools, because sharp tools can reduce the cutting heat;   2, increase the feed rate, the feed rate increases, the tool in a position to reduce the residence time, the unit volume of material to receive cutting heat is reduced to avoid material melting;   3, is to reduce the spindle speed: spindle speed is reduced, the cutting line speed is also reduced, then cutting heat is also reduced, can avoid material melting.   4, choose lubricant and coolant with excellent lubrication performance and cooling performance. We recommend choosing special aluminum alloy environmental cutting fluid, which is very suitable for aluminum alloy. CNC machining parts of the material does not melt but stick to the tool solution.   1, the spindle speed adjustment under the spindle speed is adjusted higher;   2, the feed rate is reduced;   3, improve the cooling method, change the coolant applied position on the good, plus the location of the tool cut out, there is a better cooling effect.   The above solution on CNC machining parts are always sticky tool for you to share here, CNC machining in the case of multi-species, small batch production more efficient, can reduce production preparation, machine tool adjustment and process inspection time, and reduce the cutting time due to the use of good cutting volume.

CNC lathe processing is a high-precision, high-efficiency automated machine tools with digital information to control the parts and tool displacement of mechanical processing methods. It is an effective way to solve the problems of variable varieties, small batches, complex shapes, high precision and realize efficient and automated processing of aerospace product parts. Suitability is important for people or things, whether the tools or materials we choose are suitable for Guangzhou CNC lathe processing, whether the operator knows the operation of the machine, all have a certain impact on the subsequent output, let's see together what is suitable?   Generally, the products that need to be processed by large-volume CNC lathe are adapted to automatic lathe processing, and automatic lathe is highly efficient because it can realize fully automatic processing of workpieces and adopt special automatic feeding mechanism and tooling fixture, but many parts adopt special design to greatly increase the efficiency, so once the batch of workpieces is too small, the use of automatic lathe for processing also needs to adjust the tooling fixture and automatic feeding mechanism, etc. On the contrary, it is very troublesome. The structure of the product or workpiece should be suitable for automatic feeding processing. When using automatic lathe for processing, the structure of the workpiece should be suitable for automatic sorting and automatic feeding of the workpiece. From the above analysis, we can see that there are many aspects to determine whether a workpiece is suitable for automatic processing by automatic lathe, and not only the products of mass production are suitable for automatic processing by automatic lathe.

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)