JPH07186018A - Grinding method for annular work - Google Patents

Abstract

PURPOSE:To provide high speed feed grinding by a single pass for a large grinding surface by rotating an annular work, and rotating a flat grinding wheel of which grinding work surface can be inclined by a fine angle to a ground surface about a parallel axis to the ground surface, while giving feed motion. CONSTITUTION:In grinding an annular work 1 rotating about a rotation axis 2, a grinding wheel 3 of a flat form moulded in such a way that its work surface 4 forms a fine angle theta to a ground surface 5, and this is rotated about a parallel axis 6 to the ground surface 5. A cut quantity (t) is given to this grinding wheel 3, and the work 1 and the grinding wheel 3 are relatively moved at a feed speed (f) in a parallel direction to the ground surface 5, so desired grinding is performed. The feed quantity (f) is set in such a way that the feed quantity per rotation of the work 1 is smaller than the width of the grinding wheel 3, so the whole surface of the work 1 can be ground, thereby roughness and plainness of the ground surface can be improved further.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for grinding annular workpieces.

[0002]

2. Description of the Related Art An annular work piece is ground by a method shown in FIG. That is, (a) is an annular workpiece 1
And (b) is a method of performing a grinding process by relatively moving the cup-shaped grinding wheel 3 in the radial direction of the workpiece 1 and (b) continuously cutting the cup-shaped grinding wheel 3 into the rotating workpiece 1. (C) is a method in which the flat grinding wheel 3 is intermittently provided in the radial direction of the workpiece 1 by reciprocating the workpiece 1 in a direction perpendicular to the paper surface and repeatedly giving a small cutting amount. (D) is a method in which the flat grinding wheel 3 is continuously fed in the radial direction of the workpiece 1 while repeatedly rotating the workpiece 1 while giving a small depth of cut while rotating the workpiece 1. This is a method of grinding.

[0003]

Among the above-mentioned conventional techniques, in (a), the contact area between the workpiece 1 and the grinding wheel 3 changes depending on the position in the feed direction, and the grinding resistance also changes accordingly. However, the amount of elastic displacement between the workpiece 1 and the grinding wheel 3 changes, and it is difficult to obtain highly accurate flatness. In (b), the contact area between the workpiece 1 and the grinding wheel 3 is large, and the cutting is performed in the direction perpendicular to the contact surface, so the grinding resistance becomes extremely large especially for hard and brittle materials, and highly efficient grinding processing is possible. Was difficult to do. ◆ Again
In (c) and (d), it is difficult to perform highly efficient grinding because multiple lateral feed motions are required. An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a grinding method for an annular workpiece capable of highly efficient and highly accurate machining.

[0004]

[Means for Solving the Problems] The above-mentioned problems are caused by rotating a ring-shaped work piece while rotating a flat grindstone formed so that the grindstone working surface is inclined at a minute angle θ with respect to the grinding surface. A flat grindstone that rotates around an axis that forms a minute angle θ with the grinding surface while rotating around an arbitrary axis and feeding it in a direction parallel to the grinding surface, or rotating the annular workpiece. It is solved by performing a feed motion in a direction parallel to the grinding surface and performing grinding. ◆
Further, when the inclination angle θ of the rotation axis of the flat grindstone with respect to the grinding surface can be adjusted, and the grindstone cutting amount is t and the grindstone width is B, the tilt angle θ of the grindstone working surface with respect to the grinding surface or the rotation axis of the flat grindstone. The inclination angle θ of the grinding wheel with respect to the ground surface is approximately θ = tan-1
(T / B). Further, a part of the grindstone working surface on the rear end side with respect to the feeding direction is formed parallel to the grinding surface.

[0005]

Since the working surface of the grindstone is inclined with respect to the grinding surface, the respective depth positions in the cutting direction are successively processed by the respective abrasive grains from the front end side to the rear end side in the feed direction of the grindstone working surface.
Therefore, even if the depth of cut is increased, the grinding resistance is added to each abrasive grain in a finely divided manner.
High-efficiency grinding is possible because it can be processed with a single feed motion. ◆ In addition, since the workpiece and the grinding wheel are in line contact and the change in the contact area is small, changes due to the grinding resistance itself and the position in the feed direction are small, and the elastic displacement between the workpiece and the grinding wheel is also small. Therefore, highly accurate flatness can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a front sectional view schematically showing a grinding processing state. Reference numeral 1 is an annular work piece, which rotates about a rotation axis 2. 3 is a flat grinding wheel, and its working surface 4 is a grinding surface 5
Is formed so as to form a small angle θ with respect to, and rotates about an axis 6 parallel to the grinding surface. ◆ Again
FIG. 2 is an explanatory view showing a processed state in another embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. In this case, the grindstone working surface 4 is formed in parallel with the rotary shaft 6, that is, in the shape of a cylinder, and the rotary shaft 6 is configured to form a minute angle θ with respect to the grinding surface 5. In the state shown in FIGS. 1 and 2, the depth of cut t is given to relatively move the workpiece 1 and the grinding wheel 3 in the direction parallel to the grinding surface 5 at the feed speed f. At this time, 1 of 1
If the feed amount f is determined so that the feed amount per rotation is smaller than the width of the grinding wheel 3, the entire surface of the workpiece 1 can be ground. Note that, as shown in FIG. 3, a part 7 of the grindstone working surface on the rear end side with respect to the feeding direction may be formed parallel to the grinding surface. By doing so, it is possible to further improve the roughness and flatness of the ground surface.

[0007]

As described above, according to the present invention, the portion at each depth position in the cutting direction is successively machined by each abrasive grain from the front end side to the rear end side in the feed direction of the grindstone working surface. . Therefore, the grinding resistance is dispersed and miniaturized to each abrasive grain, and a large grinding allowance can be obtained by high-feed grinding in one pass, so that there is an effect that highly efficient grinding can be performed. Further, since the workpiece and the grinding wheel are in line contact with each other and the change of the contact area is small, the change due to the grinding resistance itself or the position in the feeding direction is small, and thus there is an effect that a highly accurate flatness can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a grinding processing state in an embodiment of the present invention.

FIG. 2 is an explanatory view showing a grinding processing state in another embodiment of the present invention.

FIG. 3 is an explanatory view showing another forming mode of the grinding wheel in FIGS. 1 and 2.

FIG. 4 is an explanatory view showing a grinding processing state in the prior art.

[Explanation of symbols]

 1 Workpiece 2 Rotation axis 3 Grinding wheel 6 Rotation axis

Claims (5)

[Claims] 1. A flat grindstone formed so that the grindstone working surface is inclined at a minute angle θ with respect to the grinding surface while rotating the annular workpiece, and is rotated about an axis parallel to the grinding surface to grind the grinding surface. A grinding method for an annular workpiece, characterized in that the grinding work is carried out by feeding in a direction parallel to the surface. 2. A flat grindstone rotating around an axis forming a small angle θ with respect to a grinding surface while rotating the annular work piece is fed in a direction parallel to the grinding surface for grinding. A method for grinding an annular workpiece, characterized by the above. 3. The ring according to claim 1, wherein the inclination angle θ of the grinding wheel working surface with respect to the grinding surface or the inclination angle θ of the rotary axis of the flat grinding wheel with respect to the grinding surface is adjustable. How to grind a work piece. 4. When the grindstone cutting amount is t and the grindstone width is B, the tilt angle θ of the grindstone working surface with respect to the grinding surface or the tilt angle θ of the rotary shaft of the flat grindstone with respect to the grinding surface is approximately θ = tan-1.
(T / B) is set, The grinding method of the annular workpiece of Claim 1 thru | or 3 characterized by the above-mentioned. 5. A part of the grinding wheel working surface on the rear end side with respect to the feed direction is formed in parallel with the grinding surface.
A method for grinding an annular work piece according to claim 4.