JPH0433582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chamfering method for automatically and highly accurately chamfering the edge of a hollow cylindrical part.

[Technical background of the invention and its problems]

Conventionally, the end face of a hollow cylindrical part is chamfered by bringing an abrasive belt into contact with the end edge. However, this method has the disadvantage that the abrasive grains of the polishing belt are severely worn away, making it extremely difficult to maintain uniform chamfering conditions. In addition, it is not possible to arbitrarily control the amount of chamfering, and since the chamfer becomes a C chamfer, there is a problem in that secondary burrs are generated after chamfering. Furthermore, the conventional method described above has the disadvantage that it is impossible to deburr the inner edge of the hollow cylindrical part.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a chamfering method that can simultaneously chamfer both the inner and outer peripheral edges of a hollow cylindrical component with high precision and high efficiency.

[Summary of the invention]

In the present invention, a hollow cylindrical workpiece is rotated around its axis, and a cylindrical brush ring in which flexible linear brush bodies are radially planted is rotated, and the workpiece is viewed from the side. By cutting into the periphery of the end face of the workpiece so that the length of the chord of the cut portion is larger than the outer diameter of the workpiece, simultaneous chamfering of both the inner and outer edges of the workpiece can be performed with high precision and efficiency. This is what I decided to do.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a chamfering device used in the chamfering method of this embodiment. This chamfering device is
A workpiece holding mechanism 4 that removably holds a hollow cylindrical workpiece 1 and rotates it in the direction of arrow 3 around its axis 2; A chamfering mechanism 6 having a brush ring 5 (see Fig. 2) for chamfering an edge, a notch adding mechanism 7 for cutting this chamfering mechanism 6 into the workpiece 1, and this notch adding mechanism. 7, a cut position adjustment mechanism 8 for adjusting the stop position of the chamfering mechanism 6; a contact angle adjustment mechanism 9 for adjusting the contact angle of the brush ring 5 with respect to the workpiece 1; and a workpiece holding mechanism 4 for the workpiece 1. It consists of a transfer mechanism (not shown), such as a robot, which carries out loading and unloading operations, and a processing control mechanism 10 (see Fig. 3), whose main body is a microcomputer, which electrically controls the chamfering process. ing. Therefore, the workpiece holding mechanism 4 holds the workpiece 1 along the axis 2.
The clamp part 11 is held in a vertical direction.
and a rotary drive section 13 which is fixed to the floor 12 and mainly includes a motor that rotates the clamp section 11 in the direction of the arrow 3 with the axis 2 as the rotation axis. On the other hand, the contact angle adjustment mechanism 9
A base 14 is fixed to the floor 12 adjacent to the base 14, and arrows 15a and 15b in the left and right directions are shown on the base 14.
a moving table 16 mounted so as to be movable in the direction;
It consists of a feed screw 17 which is screwed onto the moving table 16 and whose both ends are supported so that the axial direction is in the direction of arrows 15a and 15b, and a rotary handle 18 whose one end is connected to the feed screw 17. ing. By rotating the rotary handle 18 in forward and reverse directions, the movable table 16 can be moved forward and backward in the directions of arrows 15a and 15b. moreover,
The incision adding mechanism 7 includes a gate-shaped column 19 erected on a moving table 16 and a workpiece 1 on this column 19.
a guide stand 20 formed on the side and attached to the side wall surface;
Arrows 21a, 2 which are perpendicular to this guide stand 20
A feed base 22 fitted so as to be slidable in the direction 1b;
A pneumatic cylinder 24 is fixed to the column 19 above the guide table 20 and the tip of the operating shaft 23 is connected to the upper end of the guide table 20, and one side is connected to the column 19.
A pair of sprockets 25, 25 which are integrally supported with the column 19 and the other is integrally supported with the column 19 above the feed base 22, and these sprockets 2
A chain 26 meshed with 5 and 25 and having both ends suspended in the vertical direction, and a chain 26 connected to one end of the chain 26 on the column 19 side, which is the sum of the weight of the chamfering mechanism 6 and the weight of the cutting position adjustment mechanism 8. Counter weight with equal weight 27
It is made up of. The lower end portion of the feed base 22 is an engaging portion 22a having a triangular cross section. Further, the cut adding mechanism 7 includes a support base 28 that is integrally fixed on the feed base 22, and a support base 28 that is fitted to the support base 28 so as to be slidable in the directions of arrows 21a and 21b, and the other end of the chain 26. The fine movement table 29 is connected to the fine movement table 29, and the fine movement table 29 is
It consists of a motor 30 that advances and retreats in the direction.
On the other hand, the chamfering mechanism 6 includes the brush ring 5 and
A motor 31 fixed to the upper end of the fine movement table 29;
A shaft support 32 is fixed to the lower end of the fine movement table 29 and supports the brush ring 5 so that its axis is perpendicular to the paper surface of FIG. 1; a cover 33 covers the upper half of the brush ring 5; A first pulley (not shown) is mounted around the rotating shaft of the motor 31, a second pulley 34 is mounted around the rotating shaft of the motor 31, and between the first pulley and the second pulley 34, Wrapped motor 31
and a belt 35 that transmits the rotation of the brush wheel 5 to the brush wheel 5. As shown in FIG. 2, the brush ring 5 includes a cylindrical base 36 and flexible linear brushes made of, for example, piano wire, which are radially and densely planted on the outer peripheral surface of the base 36. It consists of body 37. The radius of the brush ring 5 is set larger than the outer diameter of the workpiece 1. On the other hand, the cut position adjustment mechanism 8 includes a pedestal 38 fixedly installed in the center of the movable table 16 so as not to interfere with the column 19, and arrows 15a and 15b on this pedestal 38.
an engagement table 39 mounted so as to be slidable in the direction;
It has an operating shaft 40 which is fixed to the end of the rotating handle 18 side of the moving table 16 and whose axial direction is in the direction of arrows 15a and 15b, and the tip of this operating shaft 40 is connected to the engagement table 39.
It consists of a pneumatic cylinder 41 connected to. In this engagement base 39, engagement recesses 42 and 43 into which the engagement portion 22a is fitted are provided with arrows 15a and 15b.
It is recessed along the direction. These engaging recesses 4
2 and 43 have different depths, and
The lowering stop position, that is, the cutting position can be adjusted. Furthermore, as shown in FIG. 3, the processing control mechanism 10 is electrically connected to the workpiece holding mechanism 4, the chamfering mechanism 6, the notch adding mechanism 7, the notch position adjustment mechanism 8, and the transfer mechanism 44, which will be described later. A predetermined chamfering process is automatically performed based on a machining program.

Next, a chamfering method according to this embodiment will be described using the chamfering device having the above configuration.

First, the hollow cylindrical workpiece 1 before chamfering is transferred to the clamp section 11 and clamped by the transfer mechanism. Next, the workpiece 1 is rotated about the axis 2 in the direction of the arrow 3 by the rotary drive section 13. At this time, the feed table 22 is raised in the direction of the arrow 21b by the pneumatic cylinder 24. Further, the engagement base 39 is positioned by the pneumatic cylinder 41 at a position where the engagement portion 22a engages with the engagement recess 42. Further, the rotating handle 18 is rotated, and the movable table is moved so that the brush ring 5 is at a position where the contact angle α is positive with respect to the inner and outer ends of the workpiece 1, as shown in FIG. 16 positioning is performed. That is, the brush ring 5 is moved back and forth in a direction perpendicular to the rotational axis of the brush ring 5 and perpendicular to the rotational axis of the workpiece 1, so that the brush body 37 moves toward the workpiece 1.
The contact angle α is adjusted so that the inner and outer edges on both sides of the axis 2 are simultaneously contacted. The motor 31 is then activated to rotate the brush wheel 5 in the direction of arrow 45 at, for example, 300 revolutions per minute. Then, the pneumatic cylinder 24 gradually lowers the feed base 22 in the direction of the arrow 21a. At this time, due to the action of the counterweight 27, it can be easily driven with a small force. When the engaging portion 22a is fitted into the engaging recess 42, the feed bar 22 stops descending. As a result, the brush body 37 cuts into the workpiece 1 such that the chord length of the cut portion as seen from the side surface of the brush body 37 is larger than the outer diameter of the workpiece 1. Further, the amount of cut into the workpiece 1 by the brush body 37 is determined by the position where the engaging portion 22a is inserted into the engaging recess 42. Thus, the workpiece 1 rotating in the direction of arrow 3 has its axis of rotation aligned with the axis of rotation 2 of the workpiece 1.
The outer and inner peripheral edges of the upper end of the brush ring 5, which is rotatably supported and perpendicular to the brush wheel 5, are rounded uniformly as shown in FIG. This is set so that the contact angle α between the vertical line 49 and the line segment 48 formed by the edge point 46 and the rotation center 47 of the brush ring 5 is positive, as shown in FIG. Therefore, the outer peripheral surface 5
This is because the contact of the brush body 37 with 0 and the contact of the brush body 37 with the end surface 51 are approximately equal.
Conversely, when the contact angle α is negative, the brush body 37 contacts the outer circumferential surface 50 more than the end surface 51, so that the rounded chamfered shape becomes irregular as shown in FIG. In other words, the ratio b/a of the chamfer width a on the end surface 51 side and the chamfer width b on the outer peripheral surface 50 side is 1.
It will no longer become. Figure 6 shows the contact angle α and the ratio b/a.
The contact angle α decreases linearly from the negative side to the positive side. It can be seen that the ratio b/a becomes 1 when the contact angle α is around +20 degrees. Therefore, in this case, the movable table 16 may be positioned using the rotary handle 18 so that the contact angle α is +20 degrees. When the chamfering process is finished, the pneumatic cylinder 24 raises the feed table 22 in the direction of the arrow 21b, and the brush body 37 is separated from the workpiece 1. Next, the rotation of the workpiece 1 in the direction of the arrow 3 is stopped, the clamp is released, and the workpiece 1 after chamfering is transported to another location by the transfer mechanism. Then, the workpiece 1 before chamfering is newly transferred to the workpiece holding mechanism 4, and the same chamfering process as before is repeated again. At this time, if the height of the workpiece 1 is different, in order to make the depth of cut appropriate, the pneumatic cylinder 41 repositions the engaging part 22a to a position where it engages with the engaging recess 43. Furthermore, the brush body 3
The motor 30 is activated in response to the wear of the chamfering mechanism 7, and the chamfering mechanism 6 is lowered together with the fine movement table 29 in the direction of the arrow 21a, thereby maintaining the chamfering conditions constant.

In this way, the chamfering method of this embodiment can chamfer the inner and outer peripheral edges of the hollow cylindrical workpiece 1 simultaneously, quickly, and with high precision. Moreover, since the chamfered shape is R-shaped, 2
Next, burrs will no longer occur. Therefore, the above-mentioned effects combine to significantly improve product quality and reduce costs.

Furthermore, the number of engagement recesses may be arbitrary.
Furthermore, the same effect can be obtained by simply forming steps with different heights on the engagement base 39 instead of the engagement recess. Furthermore, instead of the cut position adjustment mechanism 8, the amount of cut may be adjusted by slightly moving the workpiece holding mechanism 4 in the directions of the arrows 21a and 21b. Similarly, instead of moving the moving table 16, the workpiece holding mechanism 4 is moved by the arrows 15a and 15b.
The cutting position of the brush ring 5 may be adjusted by moving it in the direction.

〔Effect of the invention〕

The chamfering method of the present invention involves rotating a hollow cylindrical workpiece around its axis, and rotating a cylindrical brush ring in which flexible linear brush bodies are radially planted. Since the cut is made at the periphery of the end surface of the workpiece so that the length of the chord of the cut portion when viewed from the side is larger than the outer diameter of the workpiece, the inner and outer peripheral edges of the hollow cylindrical workpiece are Simultaneous chamfering can be performed with high precision and high efficiency. Furthermore, since the chamfered shape is rounded, there is no possibility of secondary burrs occurring, and the chamfering quality can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a chamfering device used in the chamfering method according to an embodiment of the present invention, Fig. 2 is a front view of the brush ring in Fig. 1, and Fig. 3 is a connection relationship of the processing control mechanism in Fig. 1. Block diagram showing 4th
The figure is a sectional view showing the chamfered shape of a workpiece chamfered by a chamfering method according to an embodiment of the present invention, FIG. 5 is a diagram showing the chamfered shape under different chamfering conditions, and FIG. 6 is an embodiment of the present invention. It is a graph showing the relationship between the contact angle and the chamfer shape in an example chamfering method. 1: workpiece, 2: axis, 4: workpiece holding mechanism,
5: Brush ring, 6: Processing mechanism, 7: Notch addition mechanism, 9: Contact angle adjustment mechanism.

Claims (1)

[Claims] 1 In a chamfering method in which the inner and outer edges of a hollow cylindrical workpiece are simultaneously chamfered using a cylindrical brush ring in which flexible linear brush bodies are radially planted, the workpiece is held and A workpiece holding step in which the workpiece is rotated around the rotation axis of the workpiece, and the brush body is moved in the direction of the rotation axis of the workpiece so that the chord length of the cut portion when the brush body is viewed from the side surface of the workpiece is determined by the processing. a step of adding a cut to adjust the amount of cut into the workpiece by the brush ring by making a cut into the workpiece so that the cut is larger than the outer diameter of the workpiece; a contact angle adjustment step of adjusting a contact angle so that the brush body moves forward and backward in a direction perpendicular to the rotational axis of the workpiece so that it contacts the inner and outer edges of the workpiece at the same time on both sides sandwiching the axis of the workpiece; A brush wheel rotation driving step of supporting and rotationally driving the brush wheel so that the rotation axis of the brush ring is orthogonal to the rotation axis of the workpiece held in the workpiece holding step. Chamfering method.