For the problem of stone shaped processing that some industry friends care about, here is a brief introduction to the method of processing diamond stone tools with diamond tools.
First, the basic principle
We know that the sphere is cut by any plane, and the intersection line is a circle with a large diameter. The diameter of the circle varies with the distance of the cutting plane from the center of the sphere. The diameter of the circle passing through the center of the sphere is the largest. We call it the big circle, and the diameter of the circle is smaller than the circle. If an envelope of a series of circles having a diameter equal to a fixed distance is used, the envelope must be a sphere, and the curved surface formed is a spherical surface.
2. Processing the outer spherical surface of the stone with a diamond saw
At present, the tool for processing the arc surface stone is usually a cylindrical cutter, and the diamond is set on the circumferential edge of the end face of the cylinder, the thickness of the diamond cutter head is slightly larger than the wall thickness of the cylinder body; The rotational movement of its axis, on the other hand, is a feed motion along the common axis. When we use this kind of tool to machine the spherical surface, according to the size of the spherical surface required, the distance h of the tool from the center of the processing spherical surface is adjusted. The tool only rotates, and the stone blank rotates around an axis, and the axis passes through the center of the ball and rotates. After one week, a ball is processed. Then adjust the orientation of the blank holder and repeat the above process, so that the processing of the entire spherical surface is completed several times.
On the cylinder tool used, it is assumed that the minimum radius of the ring of the diamond cutter on the cylinder is r, the thickness of the diamond cutter head is â–³, and the distance between the center of the diamond cutter tip is h, and the ball is processed. R of radius.
According to the calculation company, the following conclusions can be drawn:
1. The radius of the processed ball is only related to the diameter of the cylinder cutter, and is not affected by the large diameter of the cutter. However, the difference between the large diameter and the small diameter of the cutter head, that is, the thickness of the diamond cutter â–³ affects the machining. s efficiency.
2. Once the tool is selected, the diameter of the processed ball is smaller than the spherical diameter of the tool tip plane; the minimum radius of the ball can be processed to r; theoretically, the cylinder tool can process any spherical surface with a radius larger than r. This just shows the superiority of this processing method.
Third, the advantages of this method for processing spherical stone
The main advantages of this processing method: First, the spherical surface has high geometric precision and good surface quality. Because the processing method belongs to the enveloping process, the surface formation is gradually processed by the tool one ring and one ring; secondly, the machining method does not require the addition of mechanical machine/equipment and tool. At present, with the increase in the demand for curved stone, many stone processing plants have existing diamond cylinder cutters, and we still use it to process the outer spherical surface of the stone. Third, in theory a cylindrical tool can machine any spherical surface larger than the diameter of the tool. Therefore, the number of cylinder cutters is not increased due to the change of the spherical radius, and the utilization rate of the cutter is improved. Fourth, the machining efficiency is high and can be used for mass production.
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