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4Industry news

About the tool setting problem of CNC machining center


Some friends have learned programming, and there are many problems that are not clear. For example, regarding the problem of tool setting in CNC machining centers, a friend recently has two problems as follows: machining center tool change

1. If the knife is used for the trial cutting method, we use the lower left corner of the workpiece as the reference point of the absolute coordinate. The value of the left side is the value of the Y coordinate. The value of the lower side is the value of the X coordinate. Is this the value?

2. How is the value of the Z axis determined? If the tool tip hits the upper surface of the workpiece, the measured value is to subtract the value of a tool length, which is the value of the Z axis. Then, when machining, the value of each tool is compensated by the length of the tool.

In response to the above problems, we have informed the CNC machining center the detailed method of the knife is as follows:

The following is a detailed method of tool setting in the CNC machining center. If there is a friend who will not perform the tool setting on the CNC machining center, the tool can be used to perform the tool setting.

1. Since you are a machine tool in the machining center, there must be a tool magazine function, that is, there are many tools on the machine tool.

When we are pairing the knife, the first thing to determine is the zero point in the XY direction. Your method can determine the zero point in the XY direction after the knife, but you must also remove the radius value of a tool.

2. After completing the first part above, we can determine the value in the Z direction. This value has a variety of tool setting methods.

First of all, if you fix a tool as a reference tool (such as No. 1 knife) in the tool length compensation parameter, then you set the tool to zero in the length compensation, if the tool tip hits the value measured on the upper surface of the workpiece. This is the value we need in the Z direction. You don't need to subtract the value of a tool length, we input this value into the origin offset (G54/G55, etc.)

CNC machining center tool change

The tool setting values of other tools must be input into the tool length compensation.

How is the machining center facing the knife?

First of all, you still touch the upper surface of the workpiece with the tip of the tool, and then press the main interface of the CNC machining center, there must be a relative coordinate value, the value in the Z direction of the coordinate value is the data we need.

If you don't know, we need to make another analogy. If we compare the image, we can assume that the knife is 10mm longer than the reference tool (by visual inspection), then it should have a value of about 10mm. By the same token, other tools can be used.

The problem and the solution to such a solution for CNC machining centers:

In the Z-axis direction, the tool is first calibrated with a reference tool. The length is compensated by H=0. Then, if other knives are longer than it, G43 is used. H is positively biased. It is shorter than G43 and H is negative. That's it.

That is the H value, not the difference in the length of several knives, the tool is installed, and the tool is partially extended.

Is it possible to use the tip of each knife to touch the surface of the workpiece separately, and then to see the relative value of the Z value of the machine tool coordinate between each knife and the reference knife.

If you are still unclear about how to change the tool in CNC machining center, you can call Qiao Feng Machinery to understand the specific situation. Thank you for your support of Qiao Feng Machinery. Welcome to order Qiao Feng vertical machining center, CNC machining center, three-axis CNC machining. Center, vertical extra bed.

First, the general rule of the knife road is thick: Under the maximum load of the machine tool, in most cases, the largest possible knife should be used, and the maximum amount of feed should be fed as fast as possible. In the case of the same knife, the feed is inversely proportional to the amount of feed. Under normal circumstances, the load of the machine tool is not a problem. The principle of selecting the knife is mainly considered according to whether the two-dimensional angle of the product and the three-dimensional arc are too small. After selecting the knife, the length of the knife is determined. The principle is that the length of the knife is greater than the machining depth, and the large workpiece should consider whether the chuck has interference.

Light knife: The purpose of the light knife is to meet the processing requirements of meeting the surface finish of the workpiece and preserving the appropriate margin. Similarly, the light knife uses the largest possible knife, as fast as possible, because the fine knife takes a long time to use the most suitable feed and feed. Under the same feed, the transverse feed is larger and faster, and the amount of curved feed is related to the finished finish. The size of the feed is related to the shape of the surface of the surface. Leave the smallest margin without hurting the surface. Use the largest knife, the fastest speed, and the appropriate feed.

Second, the clamping method

1. All the clips are horizontally long and short.

2. Vise clamping: The clamping height should not be lower than 10 mm. The height of the clamping and the processing height must be specified when machining the workpiece. The processing height should be about 5 mm above the plane of the vise, in order to ensure the firmness without damaging the vise. This type of clamping is a general clamping, and the clamping height is also related to the size of the workpiece. The larger the workpiece, the higher the clamping height.

3. Plywood clamping: The pallet is coded on the workbench, and the workpiece is screwed on the clamping plate. This clamping is suitable for workpieces with insufficient clamping height and large processing force. Generally, medium and large workpieces have better effect. .

4. Code iron clamping: When the workpiece is large, the clamping height is not enough, and the bottom wire is not allowed to lock, the code iron is used for clamping. This kind of clamping needs to be double-mounted, first code the four corners, process the other parts, and then code the four sides to process the four corners. When the secondary clamping is done, do not let the workpiece loose, first loosen the code. You can also code both sides and process the other two sides.

5, the clamping of the cutter: the diameter of 10mm or more, the clamping length is not less than 30mm; the diameter of 10mm or less, the clamping length is not less than 20mm. The tool should be clamped firmly to prevent the knife from being inserted directly into the workpiece.

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