JPS5914459A - Inner face grinding method - Google Patents

Abstract

PURPOSE:To perform inner face grinding of a hollow working member quickly with high accuracy, by moving a special cut-shaped grindstone wheel at the tip of spindle inclining 5-30 deg. from horizontal axis while 5-30 deg. from vertical axis while rotating with high speed. CONSTITUTION:A spindle 2 supported on a support table is inclined by 5-30 deg. in the axial direction of a work piece 1 while 5-30 deg. against the vertical axis where a special cup-shaped grindstone 3 is rotated with high speed to perform grinding with the outercircumferential inclined face parallel with the work piece 1. Here the work piece 1 is rotated with low speed and fed with feeding pitch approximately 1-1/8 times of the outercircumferential width (W) of the grindstone wheel 3 and rough polish and scratching of residual chips are performed under first pitch, intermediate finish is performed under next pitch and finish polish under final pitch. Consequently rough, intermediate and fine finish polishings can be performed in single process resulting in quick and highly accurate polishing work.

Description

[Detailed description of the invention] The present invention relates to a method for grinding the inner surface of a hollow workpiece.

To provide a grinding method for efficiently grinding the inner surface of a rigid material, especially an object that is hard and brittle.

Grinding with a commonly used grinding wheel is inefficient because the amount of grinding is very small.The present invention uses a special cup-shaped grinding wheel, and the rotating shaft of this grinding wheel is set relative to the workpiece by about 3O-=ao°. Further, the rotating shaft is tilted by about 5° to 300 degrees from the vertical axis, and the grinding surface of the circumferential surface of the grinding wheel is formed at an angle that is flat with the grinding inner surface with respect to the inclination of the rotating shaft. The workpiece is moved while rotating at high speed, and finishing grinding can be carried out at the same time.

An embodiment of internal grinding according to the present invention will be described in detail below with reference to the accompanying drawings.

1 is a hollow processed material, and this hollow processed material 1 is rotatably supported by appropriate means and is fed while being rotated at a low speed by a speed reduction mechanism.

ko is a spindle which is supported on a support base, and this spindle has an inclination of S~30° with respect to the workpiece l, that is, the horizontal direction, and also with respect to the vertical axis j~, ? (
A special cup-shaped grinding wheel 3 is attached to the tip of the spindle, and the cup-shaped grinding wheel 3 is
It is 5Kt that can advance and retreat toward the inner surface of the workpiece l. The outer peripheral grinding surface of the grinding wheel 3 is formed with an inclined surface 5 parallel to the inner surface of the workpiece 1, and rotates at high speed.

Next, processing according to the present invention will be explained.

The grinding wheel 3 of the spindleco, which is supported on a support stand, is rotatably supported by appropriate means, and the workpiece l is moved by giving axial feed, and at this time, the amount of movement of the workpiece is one rotation. On the other hand, the grinding wheel 3 is fed while rotating at a low speed via a deceleration mechanism at a feeding pitch of about 1 to 10 times the outer peripheral width W of the grinding wheel 3.

The grinding wheel 3 is set at a position where the grinding surface contacts the inner surface of the workpiece at a position away from the end of the inner surface of the workpiece, and the grinding wheel 3 is rotated at high speed, and the workpiece l is rotated at the low speed described above. When the workpiece is moved in the axial direction while being rotated, the workpiece is ground by the inner end surface and outer peripheral surface of the grinding wheel 3. At this time, if the distance that the outer circumference of the grinding wheel moves per revolution of the workpiece is narrower than l pitch, the inner surface of the workpiece will be cut by the outer circumferential surface and inner end face, and if it is wider than l pitch, a wide part will remain. It will be done.

In this case, if the material is brittle, the remaining pieces are pressed by the inner surface of the grinding wheel and are broken and removed.

In the above-mentioned grinding process, rough grinding and scraping off work are performed at the first pitch P, intermediate finishing is performed at the next pitch P, and final polishing is performed at the next pitch P. In this way, rough grinding, finish grinding, and internal grinding are performed continuously in one stroke, so that the grinding work is quick and highly accurate.

[Brief explanation of drawings]

The drawings show an embodiment of the internal grinding method according to the present invention; FIG. 1 is a side view showing the relative position of the cup-shaped grinding wheel and the workpiece; FIG. 2 is a side view of the cup-shaped grinding wheel; FIG. 3 is an explanatory diagram of grinding. L...Processed material C...Spindle 3...Special cup-shaped grinding wheel W...Grinding wheel outer circumference width Patent applicant 1) Minoru's agent Yoshitoshi Nifuji Hide Dobashi Quiver Pu
Figure 2

Claims (1)

[Claims] It has a hollow workpiece that is rotatably supported by appropriate means and moved left and right, and the inside of the workpiece has an inclination of 5° to 300° with respect to the horizontal axis and 50° to 30° with respect to the vertical axis.
A spindle with a slope of An internal grinding method in which the workpiece is rotated at low speed while moving in the axial direction, and rough, semi-finishing, and finishing are performed at the same time in the same process.