Our factory specializes in CNC machine processing, hardware lathe parts, hardware machinery accessories, medical equipment processing, axle parts processing, precision hardware processing, lighting hardware accessories, CNC numerical control lathe processing, precision mechanical parts processing, numerical control lathe processing parts, etc. Products are widely used in household appliances, instruments and meters, through. Information, aerospace, computer, mechanical equipment, automotive parts and other fields. Welcome to send drawings for price consultation.
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.
