What are the various methods of precision parts machining
With the development of the machining industry, many machining methods have also been developed, which has brought functions or advantages to our use. How good is its development? All of these are obvious to all. Precision part processing is one of them. What are the various methods of precision part processing?
The process method of precision parts machining includes the application of the programmability of the machining center to reasonably program the NC machining, and the application of the humanized operation of the machining center to optimize the cutting parameters. Kaicheng Precision Hardware Co., Ltd. reasonably selects the geometric shape of the cutting tool, and adopts the common high-speed steel drill and end mill to process high-precision and large aperture ratio titanium alloy holes.
The applicability of improved cutting tools, optimized cutting parameters and processing methods are verified through the processing of practical samples. Titanium alloy is a kind of widely used superalloy, which is mainly used in the manufacture of maintenance shell of logging tool
Therefore, the processing technology of titanium alloy for hardware precision parts has a direct impact on the quality of titanium alloy products, which involves the stop of cutting titanium alloy, especially the processing technology of deep hole drilling, and how the processability of deep hole drilling determines the application scope of titanium alloy.
The existing technology of precision parts machining is to use the mixed ceramic bearing to match the smooth oil, which may not be a problem when the spindle is at 15000 R / min. We also found that some manufacturers also use another kind of bearing, whose inner and outer edges are still composed of metal plates, but the rotating parts are composed of ceramic materials with strong rigidity and durability. Heat is the natural enemy of bearing precision and life.
When the main shaft runs to 10000r / min, it is more representative to use oil mist instrument system. Chengchuang this system provides less (but sufficient) smooth oil to reduce the heat generated by the bearings, in addition, the blowpipe also helps to dissipate the heat. The rest of the heat is transferred to a cooling system that does not cause circulation and is blocked.
Electronic products are related products based on electric energy, including smart phones, electronic watches, computers, video recorders, etc. these products are more or less used by everyone in daily life, while mobile phones and computers, almost everyone has them. But do you know that most of these inseparable products and structural parts are made by precision machining? What is the application of precision machining in electronic products?
First of all, we are very clear that when we buy an iPhone that is crazy inside, or a Mac computer that program apes have been in love with for a long time, we will assemble some coats (protective shell or protective sleeve) for it, because if the naked machine falls to the ground and bumps, it is easy to cause the scratch of the device shell, thus affecting the beauty. The equipment casings we carefully protect come from precision machining. The iPhone has used the so-called aviation grade aluminum magnesium alloy casings since the 6th generation. At present, the mainstream brand mobile phones on the market mostly use aluminum magnesium alloy, with the advantages of light weight, good heat dissipation and high strength. However, due to the complexity of its processing, it needs to be processed with precision machinery to achieve a very high precision. To a certain extent, it is seamlessly combined with the mobile phone to prevent water and dust, so the price is high.
Of course, this technology is not only applied to the mobile phone shell, but also to many metal structures inside the mobile phone. In order to ensure the compatibility of the machine and parts and the stability of the performance of the equipment in the process of operation, the parts need to have quite high precision. Therefore, this kind of parts without standard fall into the production of major domestic processing plants.
It is not difficult to understand from the above, for example, the parts, nuts and shells inside the notebook computer, the movement, needle and buckle in the electronic watch all use the precision machining technology correspondingly. This technology is widely used, but we are in the layman did not pay much attention to and understand.
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How to Realize Tool Compensation Function in CNC Machining
In CNC machining center, because of tool wear, regrinding or replacement of new tools, the parameters of relevant tools in the programming process will change, and the tool trajectory will change. If the adjustment is not enough, the final machining accuracy of the workpiece will be affected. For example, the tool center trajectory is calculated from scratch and the program is revised. In this way, not only time-consuming and labor-consuming, but also high error rate, the most convenient way to call CNC CNC system tool radius compensation performance, workpiece programming we only need to compile processing procedures according to the appearance of the workpiece, the system will automatically calculate the tool center trajectory, so that the tool deviates from the appearance of the workpiece a radius value. Even if there is a change in tool parameters, only the detailed tool parameters need to be changed, and no change in all the processing procedures is required. This greatly improves the processing efficiency of the machining center.
1. Establishment and cancellation of cutter radius compensation
Simply speaking, tool radius compensation can be divided into two kinds: left compensation and right compensation. Goodbye is defined by G41 and G42. When the center path of the tool is located on the right side of the part appearance, it is called the right compensation of the tool radius; otherwise, it is called the left compensation of the tool radius.
1. Establishment of Tool Radius Compensation
The establishment of tool radius compensation is a process in which the tool center trajectory transits from coincidence with programming trajectory to deviation from a tool radius value when the tool approaches the workpiece from the starting point to the feed speed. G41 is used to compensate the left radius of the cutter and G42 is used to compensate the right radius of the cutter.
2. Revocation of Tool Radius Compensation
The process of revoking cutter radius compensation is similar to that of creating cutter radius compensation. After the final cutter radius compensation track is processed, the cutter withdraws the workpiece and returns to the point of withdrawal. In this process, the cutter radius compensation should be revoked, and its instructions are defined by G40. The tool withdrawal point should be located outside the appearance of the part, and it may be the same as the starting point, but it may also be different.
2. Matters needing attention in inputting compensation for cutter radius in CNC machining
The change of tool radius compensation usually occurs after a period of processing in the machining center. For a continuous program segment, when the cutter radius compensation is changed, the vector at the end of a program segment is calculated with the cutter compensation specified by the program segment.
When programming NC program, we usually input the compensation amount of tool radius into the compensation code as positive value. If the compensation amount of tool radius is set as negative value, when the target of tool trajectory is fixed, it is equal to the compensation position instruction in NC program. The exchange of G41 and G42 may occur in processing. Since the processing of the outer side of the workpiece by the heart turns into the inner side processing, unexpected problems arise, so it is necessary to pay attention to the configuration of two compensation targets when inputting radius compensation.
Small Camshaft Machining, because the camshaft is relatively small, technical difficulties. But our factory has settled it, Cheers!
The camshaft is a part of the piston engine. Its function is to control the opening and closing of the valve. Although the speed of the camshaft in a four-stroke engine is half that of the crankshaft (in a two-stroke engine, the speed of the camshaft is the same as that of the crankshaft), the speed of the camshaft is usually still very high, and it needs to bear a lot of torque. Therefore, the design of the camshaft requires a high degree of strength and support, and its material is generally excellent. Carbide steel or alloy steel. Because the valve motion law is related to the power and running characteristics of an engine, camshaft design plays an important role in the design process of the engine.
Our factory is a professional manufacturer of precision machining, CNC machining, plastic injection, CNC Milling, custom machining, precision turning, die casting, etc
Our factory is a professional manufacturer of precision machining
How about the automatic tool setting system for precision parts machining
In our side, there are many precision parts processing, besides the industry, the use is still comparative, precisely because of the many, it is next to a variety of processing, are required to use it for processing, then precise parts processing of the automatic tool setting system is what?
Precision parts processing is to complete a variety of processes in the automatic form of numerical control equipment, mainly about a constant amount of expenditure homework. However, regarding the die industry and small batch cost units, do not go to the processing center at any time. Many manufacturers buy the processing center for CNC milling.
The use of tool library is very simple for the capital of CNC system, but spindle and tool library, air compressor and various tool holders will increase capital, and programming and adjusting tool library will also consume corresponding time. Therefore, the cost of less than one or two hundred workpieces of the same variety is high and inefficient, although the processing center is not used.
Precision parts processing can use automatic tool alignment system, knife upward assembly, a button, machine tool automatic tool alignment, direct processing, deviation within 0.001 ~0003 mm, compared with automatic time change, not much slower. If it is a precision parts processing center, but there is no automatic tool setting machine tool and no tool library, but there is automatic tool setting machine tool, the efficiency of the latter is much higher than the former.
As for China’s manufacturing industry, the unique thing is that for die and mould cost enterprises, they usually spend on single parts, and have abundant working resources. Therefore, for the processing of parts in small batch industries, we should consider the value of capital abundantly, and do not choose processing center equipment at all. Moreover, there are still many problems in the knife warehouse of Chinese manufacturers.
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When to Choose Spring Clamp in CNC Milling
Three-jaw electric chuck is the standard workpiece clamping device for most lathe users. This chuck has enough versatility and can be used in various turning processes. However, it is not a good fixture for all processing tasks. Spring chuck is a kind of spare workpiece clamping device, similar to claw chuck, which also uses mechanical force to fix parts that need turning. Although the size range of the workpiece provided by the spring chuck is not as wide as that of the claw chuck, the advantages it provides in relation to speed, accuracy and productivity may be extremely important for some processing tasks.
Several factors need to be considered when deciding which fixture works better. For a given lathe processing task, it is necessary to consider all the following factors when evaluating whether to choose spring chuck or claw chuck.
Spindle Load Capacity
The larger allowable weight of lathe spindle is based on bearing load capacity. If the weight of chuck and workpiece combination is too large, the bearing may be overloaded. For those processing tasks that are dangerous beyond the limit, this danger may determine the choice of workpiece fixture. Claw chuck is often heavier than the same spring chuck. Therefore, spring chuck is the appropriate choice when weight control is needed.
Spindle speed
Spring chuck is often a good choice for turning at very high spindle speed, mainly for two reasons:
One reason is related to the quality of chucks. Assuming that the chucks and spring chucks are driven by the same spindle horsepower, thicker chucks need longer time to speed up to the required speed. Long acceleration time will prolong the working cycle and reduce productivity.
Another reason is related to centrifugal force, because it increases with the increase of RPM square value, so this value is very important in the case of high speed cutting. For example, if the spindle speed is doubled, the centrifugal force will be quadrupled. This force pulls the chuck claw away from the center and often reduces the clamping force. But with spring chuck, centrifugal force will not cause obvious influence. Therefore, the clamping force will be more stable in the whole processing speed range.
Machining operation
The spring chuck exerts clamping force on the whole circumference of the part, not only in the selected contact area, so that a good concentricity can be obtained. This is particularly important for the project of secondary processing. Secondary processing needs to consider the accuracy related to primary processing, because the spring chuck has a strong ability to clamp accurately, even if it is clamped. When the claw chuck is used for primary processing, the spring chuck can also be used for secondary processing. The chuck with hollow soft claw can achieve TIR (total reading) repetition accuracy in the range of 0.0006 to 0.0012 inches, while the typical repetition accuracy of spring chuck is 0.0005 inches TIR or better. In order to further improve the secondary processing accuracy, the concentricity of spring chuck can be adjusted during installation.
Workpiece size
Spring chucks are ideal for workpieces with diameters less than 3 inches. Spring chucks restrict the length of the workpiece. In particular, spring chucks restrict the axial (Z-axis) travel range of the machine tool because they are longer than chucks. When the processing length of the workpiece almost needs the whole available travel of the machine tool, it is probably necessary to use the claw chuck.
Processing batch size
Spring chucks are suitable for large batch and small batch processing tasks.
In small batch and multi-task processing occasions, the advantages of spring chucks are related to product conversion time. It takes about 15 to 20 minutes for the claw replacement of standard claw chucks, 1 minute for quick replacement of claw chucks, and 15 to 20 seconds for quick replacement of spring chucks. It saves when products change frequently. The cumulative amount of time is considerable.
When the processing batch is large, the time saved related to clamping can also be accumulated. The opening and closing time of spring chuck is less than that of claw chuck. By reducing the non-cutting time from one workpiece to the next, the processing cycle time can be reduced.
Size range of workpiece
Part of the reason for the faster opening and closing of spring chucks is that the driving stroke of spring chucks is shorter, and the scope of workpiece size applicable to spring chucks is more limited than that of claw chucks.
Subspindle condition
Turning machines equipped with secondary spindles are often used for various mass processing. In these applications, spring chucks can significantly save processing time. They can process all facets of parts in a working cycle. These machines are often combined with bar feeders to realize unattended production and continuous processing of parts. In these applications, the time saved for a workpiece may be very small, but in the whole production process, the time saved for each workpiece is multiplied by the number of workpieces processed, and the accumulated time saved is considerable.
Chuck tool library
It is also important to consider the third option when choosing an appropriate workpiece clamping device between the claw chuck and the spring chuck. With permission, it may be cost-effective to retain two fixtures from one to the other. Change from claw chuck to spring chuck or vice versa, usually no more than 20 minutes. Claw chuck can be retained on the machine to deal with uncertain parts. But when machine tools process large quantities of workpieces, or several batches of parts of the same size, the productivity gained by using spring chucks is greatly increased, which greatly exceeds the production caused by the time spent in replacing fixtures.
Machining operation
The spring chuck exerts clamping force on the whole circumference of the part, not only in the selected contact area, so that a good concentricity can be obtained. This is particularly important for the project of secondary processing. Secondary processing needs to consider the accuracy related to primary processing, because the spring chuck has a strong ability to clamp accurately, even if it is clamped. When the claw chuck is used for primary processing, the spring chuck can also be used for secondary processing. The chuck with hollow soft claw can achieve TIR (total reading) repetition accuracy in the range of 0.0006 to 0.0012 inches, while the typical repetition accuracy of spring chuck is 0.0005 inches TIR or better. In order to further improve the secondary processing accuracy, the concentricity of spring chuck can be adjusted during installation.
Workpiece size
Spring chucks are ideal for workpieces with diameters less than 3 inches. Spring chucks restrict the length of the workpiece. In particular, spring chucks restrict the axial (Z-axis) travel range of the machine tool because they are longer than chucks. When the processing length of the workpiece almost needs the whole available travel of the machine tool, it is probably necessary to use the claw chuck.
Processing batch size
Spring chucks are suitable for large batch and small batch processing tasks.
In small batch and multi-task processing occasions, the advantages of spring chucks are related to product conversion time. It takes about 15 to 20 minutes for the claw replacement of standard claw chucks, 1 minute for quick replacement of claw chucks, and 15 to 20 seconds for quick replacement of spring chucks. It saves when products change frequently. The cumulative amount of time is considerable.
When the processing batch is large, the time saved related to clamping can also be accumulated. The opening and closing time of spring chuck is less than that of claw chuck. By reducing the non-cutting time from one workpiece to the next, the processing cycle time can be reduced.
Size range of workpiece
Part of the reason for the faster opening and closing of spring chucks is that the driving stroke of spring chucks is shorter, and the scope of workpiece size applicable to spring chucks is more limited than that of claw chucks.
Subspindle condition
Turning machines equipped with secondary spindles are often used for various mass processing. In these applications, spring chucks can significantly save processing time. They can process all facets of parts in a working cycle. These machines are often combined with bar feeders to realize unattended production and continuous processing of parts. In these applications, the time saved for a workpiece may be very small, but in the whole production process, the time saved for each workpiece is multiplied by the number of workpieces processed, and the accumulated time saved is considerable.
Chuck tool library
It is also important to consider the third option when choosing an appropriate workpiece clamping device between the claw chuck and the spring chuck. With permission, it may be cost-effective to retain two fixtures from one to the other. Change from claw chuck to spring chuck or vice versa, usually no more than 20 minutes. Claw chuck can be retained on the machine to deal with uncertain parts. However, when machine tools process large quantities of workpieces, or several batches of parts of the same size, the productivity gained by using spring chucks increases greatly, which greatly exceeds the productivity loss caused by the time spent in replacing fixtures.
In fact, the speed of spring chuck is elastic. If the workpiece size is the same, the speed of spring chuck will be faster. If the size of the workpiece varies greatly, claw chucks may be needed to accommodate the workpiece with a wide range of dimensions.
Material type
Standard claw chucks are often more effective for hot rolled steel, forgings and die-pressing parts because all such parts have inherent diameter variations. On the other hand, cold roll material parts often have good dimensional consistency, so spring chuck is suitable for selection. However, the lack of consistent diameter measurements does not necessarily constitute an obstacle to the use of spring chucks, providing chucks designed for non-circular cross-sectional use to clamp moulded bars of the desired shape for customers.
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Common Problems in CNC Lathe Processing
The problems and difficulties of VNC lathe in the process of processing are as follows:
First, how to deduce the good condition and service life of the tool?
In the process of automatic machine tool processing, it is necessary to use ear cutting to listen to the sound, stop the machine to inspect or touch the tool tip on time, and deduce according to the analysis of surface brightness, etc.
Second, how to select the appropriate tool according to the material characteristics?
In the process of processing, if the tool is not selected correctly, it will cause unstable or impossible processing, and affect the efficiency, but also can not make a good character. So it’s very important to choose cutting tools. When we process hard materials, we should choose rigid tools with strong tool tips. The machine should also use the principles of low speed, slow feed and less back eating to debug. Then when processing soft materials, such as aluminium alloy, nylon rod, copper and so on, we should correspond. What’s more, it’s better to increase the speed, feed rate, back feed rate, and use the corresponding alloy knife! Unique is that the slow feed table will cause slag extrusion, work piece winding, no slag crushing. This will greatly affect efficiency and character!
Third, what happens when the process or knife path is not arranged properly to affect the efficiency?
1. Similarly, although the knife should not be used repeatedly, it is absolutely not necessary to use the second knife when one knife can be finished. When the conditions permit, the sequence and procedure of knife arrangement must be arranged according to the knife path, so as to minimize the idle travel time, reduce unnecessary positioning deviation, and have the advantage of once again without the influence of the knife or the quality. Procedure, to reach a good processing form!
Fourthly, what about simple deformation when processing thin-walled products?
Such a product is a bit difficult, some may be divided into many processes to complete, may as well be based on product requirements, to analyze and infer! Surely to use low speed, slow feed, less back eat three major processing factors! And to choose a small tip, sharp blade against the tool, clamp as far as possible to choose the axial clamp (such as screw pressing). Silk sleeve, if radial tightening is used, there will always be deformation!
Precision CNC machining China factory offers wide range of plastic machining, cnc milling, turned parts, milling parts, cnc prototyping, cnc parts manufacturer and production plants in china.
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Characteristics of CNC Precision Parts Processing
Precision parts in the use of the essence is bound to be higher accuracy, the more sophisticated it can reflect the processing level and quality, at the same time, this kind of products are more popular with consumers. Generally speaking, NC processing in processing has incomparable advantages and characteristics, its product quality will usually be higher, then the characteristics of NC precision parts processing are as follows: Which ones?
1. Firstly, the manufacturing efficiency of CNC precision parts processing is higher. CNC parts processing can process multiple surfaces at the same time. Compared with ordinary lathe processing, CNC parts processing can save many processes and time, and the quality of parts processed by CNC is more stable than that of ordinary lathe.
2. NC precision parts processing plays an irreplaceable role in the development of new products. Generally speaking, after programming, it is better to process the parts with different and complex levels. The modification and updating of design only requires changing the program of lathe, which can greatly reduce the development cycle of products.
3. The automation level of NC precision parts processing is quite enough, which greatly reduces the worker’s energy intensity. The worker does not need to operate the whole process like an ordinary lathe in the process of processing. The main thing is to watch and monitor the lathe. However, the corresponding numerical control processing technology content is higher than the ordinary lathe, so it requires higher mental work than the ordinary lathe.
4. Initial investment is relatively larger than ordinary lathes, because the value of CNC lathes is quite high, and its maintenance cost and processing first planning period is long.
Above is the introduction of “some characteristics of CNC precision parts processing”. I hope to bring you positive assistance. If you have any questions, please call us. We will answer for you piously.
Premium Machining Company provide full range of CNC services, which include CNC Machining, CNC Milling, CNC Turning, Swiss Turning, EDM..etc.
Premium Machining Company provide full range of CNC services
How to Maintain CNC Machining Machine
CNC machine tools are mainly focused on strengthening the daily maintenance. The key maintenance work has the following contents: daily inspection, weekly inspection, monthly inspection, quarterly inspection and half-year inspection. CNC processing CNC machine tool preventive sexual care detailed as follows:
1. Daily Inspection of CNC Machining Machine Tools
Its key items include hydraulic system, spindle smooth system, guide smooth system, cooling system and air pressure system. Daily inspection is based on the normal conditions of each system to be tested. For example, when the process test of spindle smooth system is carried out, the power supply lamp should be on, the oil pressure pump should operate normally, and if the power supply lamp is not on, the spindle stop form should be maintained, which is related to the mechanical engineer. Maintenance.
2. Weekly Inspection of CNC Machining Machine Tools
Its key items include machine tool parts and spindle smooth system, which should be inspected accurately every week. It is unique to eliminate iron chips and clean up external debris for machine tool parts.
3. Monthly Inspection of CNC Machining Machine Tools
The main thing is to check the power supply and air in the dryer. The power supply voltage is rated at 180V-220V under normal conditions, and the frequency is 50Hz. If there is an exception, it should be measured and adjusted. The air dryer should be dismantled once a month and then washed and equipped.
4. Quarterly Inspection of CNC Machining Machine Tools
Quarterly inspection should focus on machine tool bed, hydraulic system and spindle smooth system. For example, when inspecting the machine tool bed, we should focus on the accuracy of the machine tool and whether the machine tool level meets the requirements of the manual. If there are any problems, it should be related to the mechanical engineer as soon as possible. When inspecting the hydraulic system and the smooth spindle system, if there are any problems, the new oil 6oL and 20L should be replaced and washed.
Half a year later, the hydraulic system, spindle smooth system and X-axis of the machine tool should be inspected. In case of defects, new oil should be replaced and then washed. After comprehensively understanding and managing the knowledge of patient prevention and sexual protection, we must have a deeper understanding and necessary management of the causes and treatment of the extraordinary phenomena in the oil pressure system. For example, when the phenomenon of oil pump not injecting oil, abnormal pressure, noise and other phenomena occur, we should know what the key reasons are and what the corresponding treatment methods are.
The causes and treatment of the extraordinary phenomena in the oil pressure system should be understood from three aspects:
(1) There may be low liquid level in the tank, reversal of the oil pump, insufficient rotation speed, high oil viscosity, low oil temperature, congestion of the filter, excessive volume of the suction pipe, air suction at the intake port, damage to the shaft and rotor, etc. For the key reasons, there are corresponding treatment methods, such as filling oil, confirming the label, etc. When the oil pump reverses, change it, etc.
(2) Abnormal pressure means excessive or insufficient pressure. The key reasons are also various, such as inappropriate pressure setting, bad coil behavior of pressure regulating valve, abnormal pressure gauge, leakage of oil pressure system, etc. Relevant treatment methods include: disassembly and washing according to the constitutional pressure configuration, replacement of a normal pressure gauge, sequential inspection according to each system, etc.
(3) Noise is mainly caused by oil pumps and valves. When the valve has noise, its reason is that the flow exceeds the rated criterion, and the flow should be adjusted appropriately. When the oil pump has noise, the reason and the corresponding treatment methods are also many-sided, such as high oil viscosity, low oil temperature, the treatment method is to raise the oil temperature; when there are bubbles in the oil, the air in the system should be released, and so on.
