JPS63185557A - Angular grinding cutting system by centerless grinder - Google Patents

Abstract

PURPOSE:To correctly grind the shoulder part of a workpiece which has a nonuniform shaft part length by retreating a workpiece supporting base at the time point close to the end of cutting and lightly attaching a stopper installed on the supporting base with the shoulder part of the workpiece. CONSTITUTION:A grinding wheel 2 is supported onto a base 5 in revolution driving ways, and has an outer peripheral surface 2a and the edge surface 2b crossing with the surface 2a at right angles, and supports an adjusting grindstone 4 in revolution-driving ways, and cutting is performed by the advance of an upper slide 6 in the A direction forming a desired angle alpha. A workpiece supporting base 8 fixed onto a lower part slide 7 which advances and retreats in the B direction perpendicular to the axis center of the grinding wheel 2 has a receiving cutter 9 for a workpiece 1 and a stopper 3 opposed to the workpiece shoulder part 1a, keeping the gap 3 in several mum or so. Cutting is carried out, keeping the relative position relation between the stopper 3 and the grinding wheel 2 constant, and at the time point close to the end, the supporting base 8 is retreated, and the stopper 3 is attached with the shoulder part 1a lightly. Therefore, angular grinding can be carried out with high precision.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an angular grinding cutting method in which the outer diameter of the shaft of a workpiece and the shoulder perpendicular thereto are simultaneously ground using a centerless grinder. It is.

[Conventional technology]

It is known that a centerless grinder simultaneously performs angular grinding on the outer diameter of the shaft of a workpiece and a shoulder perpendicular to it. For example, as shown in FIG. In the case of a workpiece 1 having a shoulder portion 1b, a conical grinding wheel 2 having an outer circumferential surface 2a and an end surface 2b orthogonal thereto.
, and make a cut in the direction of arrow P to cut the shaft part 1 of the workpiece.
The outer diameter of a and the shoulder portion 1b can be angularly ground at the same time (note that the above-mentioned cutting depth is relative, and in reality, the cutting operation is often performed by an adjusting grindstone).

In this case, if the length Ω of the shaft portion 1a of the workpiece is constant, the stopper 3 is installed facing the end surface 1c of the workpiece with a constant minute distance Δ2, and the shoulder of the workpiece is 1b
If the relationship between Δ2 and the minute interval 6 times between the end face 2b of the grinding wheel 2 and the above-mentioned Δ2 is set as Δ2−Δ1=grinding margin, spark-out will occur when the end face 1c of the workpiece hits the stopper 3. The right angle of the shoulder portion 1b to the shaft portion 1a can be precisely finished.

[Problem that the invention seeks to solve]

As mentioned above, when the length Q of the shaft portion 1a of the workpiece is constant, the shoulder portion 1b of the workpiece can be accurately ground and finished, but if the length Q of the shaft portion 1a of the workpiece is constant Otherwise, accurate angular grinding cannot be performed with the configuration shown in FIG.

Therefore, if the length of the shaft of the workpiece is not constant,
As shown in Fig. 6, a stopper 3 is placed close to the shoulder 1b of the workpiece.
By setting the gap Δ3 between the shoulder 1b and the stopper 3 to about several microns, the amount of grinding cut per revolution of the workpiece is limited, thereby preventing the shoulder from being excessively ground. It is conceivable that the deflection of the shoulder with respect to the axis can be suppressed to a few microns or less. However, it can be seen that in order to further reduce the above-mentioned runout, it is better to make the stopper lightly contact the shoulder portion at the end of grinding.

However, since it is angular grinding, the depth of cut is arrow P.
If the stopper 3 does not follow the grinding depth, Δ3 changes and becomes larger. That is,
Considering the case where the angular angle α is 10° and the grinding allowance is 0.1 mm, the increase angle Δ' of Δ3 is 0. IXtan
10° #0.018, Δ set to several microns
3 increases by about 18 microns, making it impossible to perform reliable angular grinding.

The present invention improves the problems of the prior art as described above, and enables angular grinding cuts using a grinding machine that can extremely accurately grind the shoulder part even if the length of the shaft part is not constant. The aim is to provide a method.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a stopper close to the shoulder of the workpiece on the workpiece support, and is constructed so that the workpiece support can be moved backward, and the stopper The feed of the cut is performed while the relative positional relationship between the grinding wheel and the grinding wheel is kept constant, and when the feed of cut approaches the end, the workpiece support is retreated to bring the stopper into contact with the shoulder of the workpiece. It is characterized by control.

[Effect]

Since the cutting is performed while keeping the relative positional relationship between the stopper and the grinding wheel constant, the set gap Δ3 between the shoulder of the workpiece and the stopper remains unchanged, and as a result, relatively high precision grinding is performed. In addition, when the depth of cut approaches the end, the workpiece support is retreated and the stopper is brought into light contact with the shoulder of the workpiece, so that highly accurate shoulder grinding with almost no runout can be performed.

〔Example〕

Fig. 1 is a plan view of a grinding machine to which the present invention is applied, and Fig. 2 is a front view thereof, with drive mechanisms not directly related to the present invention being omitted in order to facilitate understanding of the present invention. ing. 3 is an enlarged view of a portion of FIG. 1, and FIG. 4 is an enlarged view of a portion of FIG. 2.

As shown in these figures, in this embodiment, a grinding wheel 2 is supported on a base frame 5 so as to be rotationally driven at a fixed position, and the grinding wheel 2 is connected to an outer circumferential surface 2a and perpendicular thereto. It has a conical shape with an end surface 2b. Reference numeral 4 denotes an adjustment grindstone, which is supported so as to be rotationally driven by the upper slide 6;
is supported on the lower slide 7 so that it can be advanced (approaching the grinding wheel) or retracted in an inward direction with a desired angular angle α. Therefore, in this example,
The cut is made by moving the upper slide 6 forward (+) in the A direction.

In the present invention, the workpiece support 8 is fixed on the lower slide 7, and the lower slide is attached to the grinding wheel 2.
Move forward in direction B perpendicular to the axis of (approach the grinding wheel)
It is supported on the pace frame 5 so that it can move or move backward. Then, the receiving blade 9 of the workpiece is fixed to the workpiece support stand 8, and the stopper 3 facing the shoulder 1b of the workpiece 1 is fixed to the receiving blade 9 while maintaining a gap Δ3 of about several microns. .

In the present invention, when the relative positional relationship between the grinding wheel 2 and the stopper 3 is kept constant, that is, when the lower slide 7 is stationary, the upper slide 6 is moved along the arrow A.
In this way, the shaft portion 1a and shoulder portion 1b of the workpiece are simultaneously ground by the outer circumferential surface 2a and end surface 2b of the grinding wheel, and the grinding is Since the relative positional relationship between the grinding wheel 2 and the stopper 3 is constant, Δ3 is constant, and therefore grinding can be performed with relatively high precision.

Thus, when the grinding depth approaches the end, the lower slide 7 is slightly retreated in the (-) direction of arrow B. What are the cutting speed and retraction speed in this case?

The speed V at which the necessary depth of cut is still made after subtracting the backward speed VB of arrow B from the depth of cut V^ of arrow A, = V^-
VB=speed at finishing. In this way, Δ3=
At BXtan α, the stopper 3 comes into contact with the shoulder portion 1b of the workpiece, thereby allowing accurate angular grinding with almost no shoulder deflection.

Incidentally, when Δ3 is 0.003 mm (3 microns) and the angular angle α is lOo, the amount of retreat of arrow B is about 0.017 mm (17 microns).

〔Effect of the invention〕

As described above, according to the present invention, even when the length Q of the workpiece is not constant, the angular grinding of the workpiece can be performed with extremely high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a grinding machine to which the present invention is applied, FIG. 2 is a front view, FIG. 3 is an enlarged view of a part of FIG. 1, and FIG.
The figure is an enlarged view of a part of FIG. 2. FIG. 5 is an explanatory diagram of inevitable angular grinding when the length of the workpiece is constant, and FIG. 6 is an explanatory diagram of inevitable angular grinding when the length of the workpiece is not constant. 1a... Shaft of workpiece, 1b... Shoulder of workpiece, 2
...Grinding whetstone, 3...Stopper, 4...Adjustment whetstone, 5...Base, 6...Upper slide, 7...Lower slide, 8...Workpiece support stand, 9...・Ukeblade. 9M1 Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. In angular grinding using a centerless grinder that simultaneously grinds the outer diameter of the shaft of the workpiece and the shoulder perpendicular to it with one grinding wheel, a stopper near the shoulder of the workpiece is attached to the workpiece support stand. At the same time, the workpiece support is configured to be able to move backward, and cutting feed is performed while the relative positional relationship between the stopper and the grinding wheel is kept constant, and when the cutting feed approaches the end. An angular grinding cutting method using a centerless grinder, characterized in that the workpiece support is moved back at a certain point in time, and the stopper is controlled so as to come into contact with the shoulder of the workpiece.