### How much do you know about hole machining·

*2021-06-01*

In parts machining, we often encounter various composite angles of parts, especially in the groove features of some parts, it often appear composite angles.As shown in the image below:

There are some flat compound angle parts as shown below:

Due to the precision tolerance of the above compound Angle, it can not be measured in the machining process, which brings trouble to many field operators.In many cases, the mechanical operator will reject the machining directly on the grounds of unmeasurement.But in the actual machininng of such parts difficulty index can only calculate general.It's easy once you get the hang of it.

Now I will talk about the machining arrangement and measurement of these two typical composite Angle parts.

Like the machining of the first inlet Angle, I believe that many friends are using the following table to process.

This table basically contains the commonly used compound Angle parameters, because most of the design of the import Angle adopts the integer design of 5°, 10°, 15°, 30° and so on.

Therefore, the above table basically meets the requirements of use, and there is no need to calculate by yourself. Take the bilateral import Angle of 15° as an example to illustrate the machining clamping and tool selection.It can be found from the above table that the rotation Angle is 14.133. The cutter (grinding wheel) Angle is 5.079.In the machining, the use of positive magnetic vice or positive magnetic platform, first adjust a 15° Angle.(The use of the Shining tool will not be introduced here), then swing the Shining tool along the X axis at 14.133° and grind a cutter of 5.079° to finish the one side of the leading Angle in one time.The other side turn 180° clamping can be completed, no longer in detailed.

Let's focus on the second picture:

This high precision Angle is not standard Angle machining.The two angles in the figure above indicate how to choose the Angle of the correct tool. If the double sine tool is directly used according to the two angles on the drawing surface, the product will definitely be scrapped, and it is impossible to meet the requirements of the drawing.We need to ask the actual Angle after clamping in the processing.

Two angles are known in the figure above: 20.60° and 5.71°. At least one of the stealth angles in the actual clamping is required.

the formula is as follows

Tanαn=tanα*cosβ

put into formula

Tan αn=tan20.60°*cos5.71°The calculated value is the actual Angle value using the Shining tool.The first Angle pendulum is the calculated Angle, and the second Angle pendulum is 5.71°.In this way, it can be arranged to the Angle required by the drawing.

In the actual machining, after the angle is set, check the product margin first, test grinding on the machine, and test whether the angle is consistent with the actual requirements of the drawing after seeing the light, and then measure the actual margin, and then process the margin according to it.

Friends who don’t understand the calculation of margin and actual cutting amount can use the simplest and direct method. After seeing the light, the margin is re-grinded by 0.1 on the basis of repeated positioning, and then the actual value of the three-dimensional measurement is off the machine. Divided by the original margin and the actual margin, the actual size change after 0.1 is known. It can be estimated that there is still a margin.

Friends, have you learned?

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