The conical connection part and the right body of the block model is theoretically straight edges, but after using the treatment of slow wire, there will sometimes be a problem of “unequal blade belt”, which means that The straight line is no longer straight, or even the problem can be clearly seen with the naked eye.
Everyone knows that modern slow thread machines can respond to the treatment of high precision parts, but why does it always have an obvious problem of “unequal blade belt”? Is there something that is not going well with the precision of the tool-machine? How to solve this problem?
01
Why does the problem of “unequal blades” exist?
We analyze it through the figure below, for example, cutting a block of blocks with a cone angle of a degrees and a blade height of H.
If the cutting order must first cut the cone, cut the belt of the on-board, that is to say the room which is just after the cone cut. Then, the balance of the materials which can be cut during the cutting of the straight parts is the tan (a) * h, which can be seen from this formula:
When the thickness of the blade belt is constant, the smaller the angle of tape, the smaller the material allowance.
For example: cone angle A is equal to 0.5 degrees and the height of the hted belt H is equal to 5 mm
Then, the amount of material cut on the right blade is equal to:
Tan (a) * h = tan (0.5) * 5 = 0.0436 mm ；
If the height of the blade H is equal to 2 mm:
则 tan (a) * H = tan (0.5) * 2 = 0.017 mm.
In other words, if the cumulative error in the slit strip profile and the right profile is 0.0175 mm, a 2 mm blade height difference will be caused. When the entry point of the room is in the middle of a surface, the accumulated error is on both sides of the incoming line, so that the unequal edge belt is more obvious on both sides of the incoming line.
Therefore, the incomplete blade belt caused by the dimensional error of the treatment of machine tools exists theoretically.
02
How to solve the problem of the “unequal blade belt”?
To reduce the degree of unequal blade belts, the only way to improve cutting precision is to improve the dimensional precision of the slice tape and the belt to the right blade. Cut several times to reduce the size error, thus reducing the amount of unequal blades.
If the cone of the cutting part is large, it can be seen from the above formula that the unequal blade belt caused by the error in the direction of the dimension will be considerably reduced. Blade belt, try to increase it as much as possible. For rounded small corners, an overcoucation can occur due to a wide cone angle and cannot be treated.
If the angle of the cone is small, in order to ensure the precision of cutting the blade belt, the right side must be cut first, then the coastal part must be cut. Otherwise, the quantity of cut will be small when cutting the straight parts, and the cut will go very quickly, and the cut will not be made or the cut will be uneven.
Another point is that the perpendicularity of the wire and the parallelism of the upper surface of the room must be ensured. Currently, some technicians use sparks to find vertical parts for the convenience of operation. The movement of the workbench.
Take a circle as an example, if the surface of the room has a certain angle α with the table, there will be an elliptical error in the circle formed on the surface of the room. ), that is to say along the direction of the angle.
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