JPH10128647A - Deburring method and deburring structure of grinding wheel used in the deburring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely remove even a very small burr simultaneously with grinding by removing burr generated at both edges of a surface to be ground of a work during grinding by deburring parts formed on both edges of a grinding surface of a grinding wheel. SOLUTION: Grinding by a conical surface Tb in a grinding wheel T of a seat surface Wb is performed while a skew table is reciprocated. In this case, the grinding wheel T is reciprocated without contact with the inner peripheral surface Wa of a straight hole H of a work W in such a manner that both edges of the seat surface Wb of the work W are brought into sliding contact with each recessed curved surface Tb1 of a recessed part Tb2. Thus, the recessed curved surface Tb1 is brought into contact with both end parts of the seat surface Wb in such a manner as to gradually approach the seat surface Wb side, so that burr generated by one sliding is gradually removed each time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a deburring method and a deburring structure for a grinding wheel used in the deburring method.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, there is a grinding wheel having a tip formed in a conical shape so that an inner peripheral cylindrical surface Wa and an inner peripheral conical surface Wb of a work W can be ground. The grinding wheel T rotates relative to the workpiece W, and cuts the conical surface Wb while reciprocating in the direction indicated by the arrow in the figure to grind the conical surface Wb. Wc is
This is a relief recess formed in the work W.

[0003]

However, in the grinding of the conical surface Wb by the grinding wheel T, the boundary portion A between the conical surface Wb and the through hole Wd and the boundary portion B between the conical surface Wb and the relief recess Wc are formed. There is a risk that burrs of a very small size (several tens of microns) will be formed. These burrs fall off during grinding and adhere to other ground surfaces, causing burns or the like, or fall off after products to cause defects in products. In particular, since high precision is required for the finished state of the conical surface Wb of the work, it is necessary to avoid the occurrence of burrs as much as possible. The burr may be removed by a brush or the like after the grinding process, or may not be generated by processing the edge portion into an R shape before the grinding process. In the former, however, the surface roughness of the ground surface is reduced by the brush. In addition to the decrease, the number of processing steps increases, and the conical surface Wb cannot be removed because it is formed on the inner side of the minute inner diameter. In the latter case, a pre-process for forming the edge portion into an R shape is required, There is a problem that the number of processing steps increases and the manufacturing cost increases.

Accordingly, an object of the present invention is to provide a deburring structure for a grinding wheel capable of reliably removing even minute burrs simultaneously with grinding.

[0005]

In order to achieve the above object, according to the present invention, a surface to be ground of a work and a grinding surface of a grinding wheel are relatively rotated and relatively reciprocated in a direction perpendicular to the rotation direction. By moving, when grinding the surface to be ground of the work, the burrs formed on both edges of the grinding surface of the grinding wheel, during the grinding, both edges of the surface to be ground of the work The burr generated in the part is removed.

It is preferable that the deburring by the deburring section is performed every predetermined number of times of reciprocating movement between the ground surface of the work and the ground surface of the grinding wheel. In particular, it is preferable that the deburring unit performs deburring every one movement.

It is preferable that the deburring portion of the grinding wheel used in the deburring method has a concave curved surface. Thereby, when the ground surface of the workpiece and the ground surface of the grinding wheel are reciprocated relatively, the generated burrs are gradually brought into sliding contact with the concave curved surface and removed.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an internal grinding machine to which a grinding wheel having a structure according to the present invention is applied. The inner surface grinding machine is generally provided with a work table 11 fixedly arranged on the bed 10, a direct table 12 movably arranged on the bed 10, and a movable table on the straight table 12. And a skew table 13.

The work table 11 is driven by a first motor 14 to rotate through a belt 15 through a spindle head 16.
A chuck 17 is fixed to the tip of the workpiece W, and the work W is held by the chuck 17.

The orthogonal table 12 is configured to horizontally move an orthogonal rail 18 provided on the bed 10 in the Z-axis direction by driving a second motor 19 via a ball screw (not shown). Specifically, the direct rail 18 is shown in FIG.
, A first rail 18a having a flat surface,
A second rail 18a having a substantially V-shaped groove 18b,
The leg 20a of the direct table 12 is connected to the first rail 18a.
And a leg 20b having a wedge-shaped tip is engaged with the substantially V-shaped groove 18b of the second rail 18a so as to be slidably mounted.

The skew table 13 corresponds to the direct table 1.
Like the direct table 12, the skewed rail 13a is horizontally moved in the Zc-axis direction tilted with respect to the Z-axis by driving the third motor 21 via a ball screw (not shown). . The skew table 13 is arranged at a predetermined inclination angle with respect to the straight rail 18 of the straight table 12. On the skew table 13, a wheel head 22 that holds the grinding wheel T so as to be rotatable is provided in the Z-axis direction. The inclination angle of the skew table 13 is made to coincide with the inclination angle of the conical surface of the grinding wheel T. Therefore, if the third motor 21 is driven to move the skew table 13, the conical surface Tb of the grinding wheel T moves parallel to the sheet surface Wb of the work W.

As shown in FIG. 3A, the grinding wheel T is used for grinding a cylindrical surface Ta for grinding the inner peripheral surface Wa of the straight hole H of the work W and a sheet surface Wb for the work W. And a conical surface Tb. On the conical surface Tb,
A recess Tb2 having a concave curved surface Tb1, which is an example of the deburring portion according to the present invention, is formed in the circumferential direction. Recess Tb
The width dimension of 2 is formed such that when the grinding wheel T is reciprocated, both edges of the sheet surface Wb of the work W do not exceed the position of the concave curved surface Tb1. The depth of the recess Tb2 is at least larger than the generated burrs. Note that, instead of the concave curved surface Tb1, FIG.
As shown in (a) and (b), the work W may be formed with a tapered surface or a convex curved surface, but it is concave in that the burrs generated by the edge of the sheet surface Wb of the work W gradually slidingly contacting can be removed. It is preferable to form the curved surface Tb1.

On the work table 11, a dress table 11a is extended. On the dress table 11a, an arm 23 is rotatably supported by a support shaft 23a. A dress grindstone 24 for dressing the grindstone T is rotatably mounted. The arm 23 is rotated and positioned at a substantially horizontal dress position shown in FIG. 1 during dress forming, and at the time of grinding the work W, approximately 30 ° around the support shaft 23a to avoid interference between the dress grindstone 24 and the grinding grindstone T. It is configured to be held at the standby position rotated upward.

In the internal grinding machine having the above configuration, the inner peripheral surface Wa and the sheet surface Wb of the straight hole H of the work W are ground as follows.

That is, first, the work W is placed on the chuck 17.
, The workpiece W is rotated via the belt 15 by the driving of the first motor 14, and the wheel head 22 is rotated.
Drives the grinding wheel T to rotate. Then, the second motor 19 is driven to drive the direct table 1 via the ball screw.
2 is horizontally moved in the Z-axis direction toward the workpiece W, and the grinding wheel T is positioned at the center of the straight hole H. continue,
The skew table 13 is moved in the Zc-axis direction via a ball screw by driving the third motor 21 so that the cylindrical surface Ta of the grinding wheel T slides on the inner peripheral surface Wa of the straight hole H of the work W. Position. Next, the orthogonal table 12 is set in the axial direction of the straight hole H, that is, Z.
By reciprocating (oscillating) at high speed in the axial direction, grinding of the straight hole H is started. The cutting feed is performed by moving the skew table 13 by a predetermined dimension in the Zc-axis direction.

After the inner peripheral surface Wa of the straight hole H of the work W has been ground in this way, the skew table 13 is moved so that a predetermined distance is formed between the cylindrical surface Ta of the grinding wheel T and the inner peripheral surface Wa of the work W. Form gap dimensions. And the direct table 1
By moving the workpiece 2 forward, the conical surface Tb of the grinding wheel T is brought into sliding contact with the sheet surface Wb of the workpiece W. This seat surface W
In the grinding process b, as shown by the arrow in FIG. 3A, the skew table 13 is reciprocated in the Zc-axis direction (oscillate).
Perform while doing. In this case, the grinding wheel T does not contact the inner peripheral surface Wa of the straight hole H of the workpiece W, and
The work W is reciprocated so that both edges of the sheet surface Wb of the work W are in sliding contact with the respective concave curved surfaces Tb1 of b2. As a result, the concave curved surface Tb1 comes into sliding contact with both ends of the sheet surface Wb so as to gradually approach the sheet surface Wb side, so that burrs generated by one sliding operation are gradually removed each time. (See FIG. 3B). The cutting feed is performed by advancing the orthogonal table 12 by a predetermined dimension in the Z-axis direction.

Thereafter, when the grinding wheel T is worn, dress forming is performed as in the case of the inner surface grinding. That is,
The arm 23 is rotated to the dress position, the dress grindstone 24 is positioned in front of the workpiece W, and the dress grindstone 24 is driven to rotate by a motor (not shown). Dressing is performed by bringing Ta into sliding contact with the dressing grindstone 24. Further, after positioning the orthogonal table 12 at a predetermined position, dress forming of the conical surface Tb is performed while the skew table 13 is reciprocated. The dressing of the concave curved surface Tb1 is performed by simultaneously controlling the movement of the direct table 12 and the skew table 13 with two axes.

In the above embodiment, the case where the recess Tb2 according to the present invention is applied to the case where the sheet surface Wb of the work W is ground has been described.
As shown in (b), the work W may be used to remove burrs generated on the edge of the inner peripheral surface Wa or the outer peripheral surface.

[0020]

As is apparent from the above description, according to the deburring method according to the present invention, the surface to be ground of the work and the grinding surface of the grinding wheel are rotated relative to each other, and the rotation direction is orthogonal to the rotation direction. When the surface to be ground of the work is ground by the reciprocating movement relative to the surface of the work, the deburring portions formed on both edges of the ground surface of the grinding wheel cause the work to be ground during the grinding. Since the burrs generated on both edges of the ground surface are removed, the deburring of the edges can be removed at the same time as the grinding process is performed. As a result, a separate step is not required for deburring, and work efficiency is improved. In particular, it is excellent in that even burrs that are difficult to remove in a subsequent step, for example, burrs in a hole or minute burrs can be reliably removed.

The deburring by the deburring unit is
Because the grinding surface of the work and the grinding surface of the grinding wheel are reciprocated relative to each other every predetermined number of movements,
Burrs can be easily and reliably removed.

Further, since the deburring portion of the grinding wheel used in the deburring method has a concave curved surface, burrs are gradually removed, and a smooth deburring operation can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view (a) and a front view (b) of an internal grinding machine according to the present embodiment.

FIG. 2 is a sectional view of a direct table of the internal grinding machine according to the embodiment.

FIGS. 3A and 3B are a cross-sectional view showing a grinding state of a conical surface of a work and an enlarged view showing a deburring portion; FIGS.

FIG. 4 is a partially enlarged view showing a deburring portion according to another shape.

FIG. 5 is a schematic view showing a grinding state on another grinding surface.

FIG. 6 is a cross-sectional view showing a state of grinding with a grinding wheel according to a conventional example.

[Explanation of symbols]

 T Grinding wheel Tb Conical surface (outer peripheral surface) W Work Wb Sheet surface (annular grinding surface) Tb1 Deburring portion Tb2 recess

Claims (3)

[Claims] 1. The grinding surface of the work is grinded by relatively rotating the ground surface of the work and the grinding surface of the grinding wheel and reciprocating relative to the direction perpendicular to the rotation direction. In this case, a deburring part formed on an edge of a grinding surface of the grinding wheel removes burrs generated on an edge of a ground surface of the workpiece during the grinding. 2. The method according to claim 1, wherein the deburring by the deburring unit is performed every predetermined number of times of reciprocating movement of the ground surface of the workpiece and the ground surface of the grinding wheel. Deburring method. 3. A deburring structure for a grinding wheel, wherein the deburring portion of the grinding wheel used in the deburring method according to claim 1 has a concave curved surface.