JP2019111620A - Chamfer device and chamfer method - Google Patents

Abstract

To provide a chamfer device and a chamfer method which can chamfer an end surface of a work-piece whose cross section is formed in a convex polygonal shape, a circular shape, a semicircular shape or an elliptical shape, without substantially changing a configuration of the device.SOLUTION: A chamfer device 1, which chamfers a corner part 10b of an end surface of a rod-like work-piece 10 with a grindstone 60, comprises: a holder 20 that holds a work-piece whose cross section is formed in a convex polygonal shape, a circular shape, a semicircular shape or an elliptical shape; rotationally driving means 30 that rotates the holder with a shaft line 10c along a longitudinal direction of the work-piece as a center; a positioning surface 40 that performs positioning of the work-piece by contacting a side face 10d of the work-piece or a side 10e extending in the longitudinal direction of the work-piece; and energizing means 50 that energizes the holder in a direction of the positioning surface so that the side face and the side are kept in contact with the positioning surface during rotation of the holder, where relative positions of the positioning surface and the grindstone are adjusted so that the grindstone is kept in contact with the corner part during the rotation of the holder.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chamfering apparatus and a chamfering method capable of chamfering corner portions of an end face of a workpiece having a convex polygonal, circular, semicircular, or elliptical cross section without largely changing the apparatus configuration.

There is known an apparatus for chamfering the corner of the end face of a rod-like workpiece having a polygonal cross section.
For example, in Patent Document 1, in a state where the holder holds a rectangular solid work, the grindstone moves to the end face of the work and chamfers one corner of the end face. Next, in a state where the grindstone is retracted and the holder separates the work, the pressing member pushes down the work to rotate the work 90 degrees. Then, while the holder holds the work again, the grindstone moves and chamfers the corner of the other side of the end face. A chamfering device capable of chamfering the four sides of the end face by repeating such a process is disclosed.

JP 2007-276023 A

However, the techniques disclosed in the above patent documents have the following problems.
That is, since it is a mechanism which chamfers by rotating a workpiece by 90 degrees by a pressing member, there is a problem that a corner of an end face of a workpiece having a circular or elliptical cross section can not be chamfered.
In addition, every time the corner of one side of the end face of the workpiece is chamfered, the grindstone is temporarily retracted and the workpiece is rotated 90 degrees, which makes it difficult to position the grindstone and the workpiece.
In addition, since a mechanism for driving the holder, a mechanism for moving the grinding stone, and a mechanism for rotating the work by 90 degrees are required, there is a problem that the size of the chamfering apparatus is increased and the manufacturing cost is increased.

  In view of such problems, the present invention provides a chamfering device and a chamfering method capable of chamfering the end face of a workpiece having a convex polygonal, circular, semicircular or elliptical cross section without significantly changing the device configuration. As an issue.

A chamfering apparatus according to the present invention is a chamfering apparatus for chamfering a corner of an end face of a rod-like work with a grinding stone, the holder for holding the work having a convex polygon, a circle, a semicircle or an ellipse in cross section; A rotary drive means for rotating the holder about an axis along the longitudinal direction of the workpiece, and a positioning surface for positioning the workpiece by contacting the side surface of the workpiece or a side edge extending in the longitudinal direction of the workpiece And biasing means for biasing the holder in the direction of the positioning surface so that the side surface and the side continue to contact the positioning surface while the holder is rotating, and the holder is rotating The relative position between the positioning surface and the grinding wheel is adjusted so that the grinding wheel continues to contact the corner.
Further, the grinding wheels are provided one by one on both end surfaces of the work.
Further, it is characterized in that it comprises rocking means for rocking the grinding wheel.
Further, the holder is provided with a fitting hole matching the cross-sectional shape of the work, and the work is held by fitting the work in the fitting hole.
In addition, the holder, the rotation driving means, and the attachment are provided between a chamfering position where the positioning surface is fixed on a table and the workpiece is chamfered and a supply position where the workpiece is supplied to the holder. It is characterized in that the biasing means moves integrally.
The chamfering method of the present invention is the chamfering method for chamfering the corner of the end face of a rod-like work with a grinding stone, wherein the step of holding the work having a convex polygon, circular, semicircular or oval cross section with a holder A step of rotating the holder about an axis along the longitudinal direction of the workpiece, and a positioning surface for positioning the workpiece by contacting a side surface of the workpiece or a side edge extending in the longitudinal direction of the workpiece A step of biasing the holder in the direction of the positioning surface such that the side surface and the side continue to contact the positioning surface while the holder is rotating; The method further comprises the step of adjusting the relative position between the positioning surface and the grinding wheel so as to keep in contact with the part.

According to the present invention, the corner of the end face of the workpiece is chamfered with a grindstone in a state where the workpiece is positioned by keeping the side surface or the side contact with the positioning surface while rotating the workpiece around the axis. Therefore, once the relative position between the positioning surface and the grindstone is adjusted, chamfering can be performed without changing the position of the grindstone. Also, the chamfering is completed only by rotating the work one turn around the axis. Thus, the present invention can increase the efficiency of the chamfering process.
Further, if one grindstone is provided on both end faces of the work, machining of both end faces of the work can be completed simultaneously.
Further, by providing the rocking means, it is possible to prevent uneven wear of the grinding wheel, maintain the chamfering accuracy for a long time, and extend the life of the grinding wheel.
In addition, if a plurality of holders are prepared in advance in which the shape of the fitting hole is changed according to the work whose cross section is a convex polygon, a circle, a semicircle, or an ellipse, the configuration of the chamfering device can be significantly changed. Instead, it is possible to cope with workpieces of various sectional shapes simply by replacing the holder and adjusting the relative position between the positioning surface and the grinding wheel. That is, it is possible to cope with a workpiece whose cross section is a circle, a semicircle, or an ellipse, not a chamfering device dedicated to a convex polygon.
In addition, since the holder, the rotation driving means and the biasing means move integrally between the chamfering position and the supply position, it is possible to easily cope with the automation of the chamfering by the work feeder.

A perspective view (a) of a workpiece with a rectangular cross section with chamfered corner portions and a front view (b) of a workpiece with another cross sectional shape Top view (a) and front view (b) of the chamfering device with the work in the supply position Top view (a) and front view (b) of the chamfering apparatus in the state in which the work is in the chamfering position A perspective view of the chamfering device with the workpiece in the chamfering position A perspective view of the holder (a) and a perspective view of the holder in the state of holding the work (b) Front view showing the state of workpiece and positioning surface of rectangular section during chamfering process (view under T1 to T5) and plan view showing state of workpiece and grinding wheel (view over T1 to T5) Front view (bottom of a to e) showing the state of the work and positioning surface of the cross-sectional oval during chamfering processing and plan view (top of a to e) showing the state of the work and the grinding wheel Front view showing the state of workpiece and positioning surface of semicircular cross section during chamfering process (view under a to e) and plan view showing state of workpiece and grinding wheel (view on a to e) Front view showing a state in which the work after chamfering has been returned to the supply position

An embodiment of the chamfering device of the present invention will be described.
The chamfering device 1 is used to chamfer the corner 10b of the end face 10a of the rod-like work 10 with a grindstone 60 (see FIG. 2) as shown in FIGS. 1 (a) and 1 (b). As the work 10, the shape of the cross section orthogonal to the longitudinal direction may be a convex polygon (for example, a quadrangle 11, a hexagon 12, a triangle 13), a circle 14, an ellipse 15 or a semicircle 16. In the case of a convex polygon, the lengths of the corner sides do not have to be equal.
As shown in FIGS. 2 to 4, the chamfering device 1 is roughly composed of a holder 20, a rotational drive means 30, a positioning surface 40, an urging means 50, a grinding wheel 60, a swinging means 70 and a linear actuator 80. In addition, in order to make an understanding easy, illustration of a component may be partially abbreviate | omitted in each figure of FIGS.

The holder 20 is a member for holding the work 10. As shown in FIG. 5, the holder 20 has a stepped shape including a first circular portion 21 and a second circular portion 22, and has a fitting hole 23 penetrating the centers of the first circular portion 21 and the second circular portion 22.
The fitting hole 23 is designed to have a shape conforming to the cross-sectional shape of the workpiece 10, that is, a size slightly larger than the outer shape (convex polygon, circle, semicircle, or oval) of the workpiece 10. The work 10 is held by fitting the work 10 into the fitting hole 23. The work of fitting the work 10 into the fitting hole 23 may be automatically performed using a known work feeder 90 (parts feeder) or may be manually performed by a worker. In the present embodiment, the holder 20 is moved to the supply position P 1 to supply the work 10 from the work feeder 90. In order to correspond to a plurality of types of workpieces 10, a plurality of holders 20 having different shapes of the fitting holes 23 may be prepared in advance.

  The rotational drive means 30 is provided to rotate the holder 20 holding the work 10 about an axis 10 c (see FIG. 6) along the longitudinal direction of the work 10. Specifically, the first motor 33 fixed to the first plate 32 via the bracket 31a, the main moving gear 34 fixed to the rotation shaft of the first motor 33, the driven gear 35 meshing with the main moving gear 34, the driven gear 35 And a ball bearing 36 fixed to the first plate 32 via a bracket 31 b to support the rotation of the first plate 32. A circular opening 35a is provided at the center of the driven gear 35, and the second circular portion 22 of the holder 20 is fitted and fixed to the opening 35a. When the first motor 33 is driven, the main driving gear 34 and the driven gear 35 rotate, and the work 10 held by the holder 20 can be rotated about the axis 10 c.

The positioning surface 40 is a member for positioning the work 10 by contacting the side surface 10 d of the work 10 and a side 10 e extending in the longitudinal direction of the work 10. Specifically, two positioning members 41 extending in the left-right direction are disposed at positions sandwiching the driven gear 35 from the front and rear. The front end surface of each positioning member 41 corresponds to the positioning surface 40. The two positioning members 41 are fixed to the table 38 and fixed to the upper end of the bracket 42 extending upward.
The biasing means 50 is provided to bias the holder 20 in the direction of the positioning surface 40 so that the side surface 10 d and the side 10 e of the workpiece 10 keep contacting the positioning surface 40 while the holder 20 is rotating. Specifically, the biasing means 50 is a spring 51, a spring receiving convex portion 52 fixed to the right end of the second plate 37, and a position adjusting screw fixed to the left end of the second plate 37. Outlined from 53. The first plate 32 is mounted on the second plate 37 so as to be slidable. The left end of the spring 51 is fixed to the first plate 32, and the right end is fixed to the screw 52a of the spring receiving convex portion 52. Since the first plate 32 is biased in the left direction by the spring 51, the rotational drive means 30 fixed on the first plate 32 is also biased in the left direction. Although the detailed description will be described later, the second plate 37 is fixed to the rod 81 of the linear motion actuator 80 on the lower surface thereof so as to be slidable on the table 38 in the left-right direction.

  For example, when the cross-sectional shape of the workpiece 10 is a square, the workpiece 10 is rotated when the workpiece 10 (holder 20) is rotated from the state (T1) in which the side surface 10d of the workpiece 10 is in contact with the positioning surface 40 as shown in FIG. While being urged in the left direction (the positioning surface 40 side) by the elastic force 51a of the spring 51, the side 10e is rotated while being in contact with the positioning surface 40 (T2). The axis 10c of the work 10 moves to the right, and in the state where the work 10 is rotated 45 degrees (T3), the axis 10c of the work 10 moves to the most right. When the work 10 is rotated 45 degrees or more, the axis 10c moves leftward (T4), and when the work 10 is rotated 90 degrees, the other side 10d of the work 10 contacts the positioning surface 40, and the axis 10c Returns to its original position (T5). Thus, the biasing means 50 biases the work 10 leftward so that the side face 10 d or the side 10 e continues to contact the positioning face 40 during its rotation.

The grindstones 60 are disposed one by one on the front and rear end faces 10 a side of the work 10. In the present embodiment, a cup-shaped grindstone 60 is attached to the rotation shaft of the grindstone drive motor 61. The chamfering angle and the chamfering width of the corner 10b of the workpiece 10 can be changed by changing the angle formed by the rotation axis and the axial center of the workpiece 10 in plan view. The grindstone 60 may be disposed on only one of the front and rear end faces 10 a of the work 10. Further, the grindstone 60 is not limited to the cup shape, and may be appropriately selected from a cylindrical shape, a rod shape, and the like.
The relative position with respect to the positioning surface 40 is adjusted so that the grindstone 60 can be kept in contact with the corner 10 b of the workpiece 10 while the holder 20 is rotating. Specifically, the grindstone 60 is adjusted to be present on an extension of a straight line connecting the front and rear positioning surfaces 40 in plan view. Thus, as shown in FIG. 6, when the side face 10d of the workpiece 10 is in contact with the positioning surface 40 (T1 and T5), the grindstone 60 contacts and chamfers the linear portion of the corner 10b of the workpiece 10. While the side 10e of the work 10 is in contact with the positioning surface 40 (T2 to T4), the grindstone 60 is in contact with the apex of the corner 10b of the work 10 and is chamfered. The chamfering operation is completed when the work 10 rotates once.
When the cross section of the work 10 is a convex polygon, the grindstone 60 chamfers the straight portion and the vertex of the corner 10 b of the work 10 as in the case of the square. When the cross section of the work 10 is circular or elliptical as shown in FIG. 7, the positioning surface 40 continues to contact the side face 10 d of the work 10 and the grindstone 60 is the corner 10 b of the end face 10 a of the work 10 (peripheral portion of the end face 10 a Chamfer). When the cross section of the work 10 is semicircular as shown in FIG. 8, the positioning surface 40 continues to contact the side face 10 d or the side 10 e of the work 10 and the grindstone 60 is a corner 10 b of the end face 10 a of the work 10 (the end face 10 a Chamfer the peripheral portion, the apex and the straight portion).

The rocking means 70 is provided for rocking the grindstone 60 to prevent uneven wear of the grindstone 60. Specifically, the rocking motor 71 is disposed on the side surface of the grinding wheel driving motor 61, and the eccentric cam 72 and the rocking spring 73 are in contact with the grinding wheel driving motor 61. A direction perpendicular to the rotation shaft of the grinding wheel driving motor 61 by driving the grinding wheel driving motor 61 while urging the grinding wheel driving motor 61 to the eccentric cam 72 side by the rocking spring 73 (arrows in FIGS. 6 to 8 111)). In addition, by rotating the grinding wheel position adjustment screw 74 attached around the grinding wheel drive motor 61 for the purpose of finely adjusting the wear of the grinding wheel 60 and the chamfering angle and the chamfering width, the rocking motor 71 and the grinding wheel 60 are 6-8 (see arrow 112).
The linear motion actuator 80 is fixed to the lower surface of the table 38, and the second plate 37 is fixed to the rod 81 via the bracket 82. By driving the linear actuator 80 to move the second plate 37 in the left-right direction as shown by the arrow 110 in FIG. 2 and FIG. 3, the holder 20, the rotational drive means 30 and the biasing means 50 are integrated. It can be moved between the supply position P1 and the chamfering position P2.
Note that a part of the chamfering device 1 may be covered with a cover so that abrasive powder or the like does not intrude into the sliding surface of each plate or the meshing position of the gear.

Next, the operation of the chamfering device 1 and the chamfering method will be described.
The operator prepares the holder 20 conforming to the cross-sectional shape of the workpiece 10 to be processed, and fits and fixes it in the opening 35 a of the driven gear 35. The holder 20 and the like drive the linear actuator 80 and move it to the supply position P1. Further, a plurality of works 10 are set in the work feeder 90.
When the work feeder 90 is driven, the work 10 moves forward and enters the fitting hole 23 of the holder 20. A stopper 100 having a workpiece seating sensor is disposed at the supply position P1 so as to be rotatable in the vertical direction by the second motor 101, and the front end surface 10a of the workpiece 10 contacts the stopper 100 extending in the horizontal direction. Due to the detection by the seating sensor, the supply of the work 10 from the work feeder 90 is temporarily stopped.
Next, the linear motion actuator 80 is driven, the second plate 37 starts moving leftward, and the holder 20 mounted on the second plate 37, the rotation driving means 30, and the biasing means 50 integrally move leftward. Start moving to At this time, the front and rear end surfaces 10a of the work 10 are moved leftward while being restricted by the guide member 102 so that positional deviation in the front-rear direction does not occur. The guide member 102 may be fixed to a portion of the carry-in path 91 of the work feeder 90 or a portion of the carry-out path 92 for carrying out the work 10 after processing.

When the side surface 10 d or the side 10 e of the work 10 comes into contact with the positioning surface 40, the rod 81 of the linear actuator 80 is stopped. The workpiece 10 is now set at the chamfering position P2. A well-known sensor may detect that the side surface 10d of the workpiece 10 contacts the positioning surface 40, or the amount of movement of the rod 81 in the left direction so that the side surface 10d of the workpiece 10 contacts the positioning surface 40 It may be adjusted in advance.
As the first motor 33 is driven, the main driving gear 34 and the driven gear 35 rotate, and the work 10 held by the holder 20 starts to rotate. At the same time, the grinding wheel driving motor 61 is driven, and the grinding wheel 60 also starts to rotate. The grindstone 60 may start rotating before the work 10 arrives at the chamfering position P2.
The workpiece 10 rotates while its side surface 10 d or side 10 e contacts the positioning surface 40, and the first plate 32 biased leftward by the spring 51 moves in the left-right direction according to the rotation of the workpiece 10 Do. The amount of movement of the first plate 32 in the left-right direction can be adjusted by changing the position of the tip of the position adjustment screw 53.
While the work 10 is rotating, the grindstone 60 is chamfered by the rocking means 70 to chamfer the corner 10 b of the end face 10 a of the work 10.
The chamfering process is completed when the work 10 makes one rotation, and the work 10 returns to the supply position P1 by moving the rod 81 of the linear motion actuator 80 in the right direction. When the workpiece seating sensor detects that the workpiece 10 has returned to the supply position P1, the stopper 100 rotates upward as shown in FIG. 9, and the next workpiece 10 is moved forward from the workpiece feeder 90 according to this. The workpiece 10 which has been chamfered is pushed by the end face 10a of the next workpiece 10, thereby coming out of the fitting hole 23 of the holder 20, and passing through the carry-out path 92 to be accommodated in the product box 93. In addition, you may align-convey the workpiece | work 10 which the chamfering process completed not to the product box 93 but to the processing apparatus of the following process.
The stopper 100 returns to the horizontal state again, and stands by until the front end face 10a of the next workpiece 10 comes into contact with the stopper 100.

  The present invention is a chamfering apparatus and a chamfering method capable of chamfering the end face of a workpiece having a convex polygonal, circular, semicircular or elliptical cross section without significantly changing the apparatus configuration in consideration of such problems. Has the above availability.

P1 supply position
P2 Chamfering position
1 Chamfering device
10 work
10a end face
10b corner
10c axis
10d side
10e side
11 square
12 hexagons
13 triangle
14 round
15 half round
16 oval
20 holder
21 first circular portion 21
22 second circular portion 22
23 mating hole
30 rotation drive means
31a bracket
31b bracket
32 1st plate
33 1st motor
34 prime mover gear
35 driven gear
35a opening
36 ball bearing
37 Second plate
38 table
40 Positioning surface
41 Positioning member
42 bracket
50 energizing means
51 spring
51a elastic force
52 Spring support projection
52a screw
53 Adjustment screw
60 whetstone
61 Motor for driving grinding wheel
70 Swinging means
71 Swing motor
72 Eccentric cam
73 Swing spring
74 Wheel position adjustment screw
80 linear actuator
81 rod
82 bracket
90 work feeder
91 Loading route
92 Exit
93 Product Box
100 stoppers
101 2nd motor
102 Guide member
110-112 Arrow

Claims (6)

In a chamfering apparatus for chamfering a corner of an end face of a rod-like workpiece with a grinding stone,
A holder for holding the work whose cross section is a convex polygon, a circle, a semicircle, or an ellipse;
Rotary drive means for rotating the holder about an axis along the longitudinal direction of the workpiece;
A positioning surface for positioning the work by contacting a side surface of the work or a side extending in the longitudinal direction of the work;
Biasing means for biasing the holder in the direction of the positioning surface such that the side surface and the side continue to contact the positioning surface during rotation of the holder;
The relative position of the said positioning surface and the said grindstone is adjusted so that the said grindstone may contact the said corner part during rotation of the said holder, The chamfering apparatus characterized by the above-mentioned.
The chamfering device according to claim 1, wherein the grinding wheel is provided one by one on both end sides of the work.
The chamfering device according to claim 1 or 2, further comprising rocking means for rocking the grinding wheel.
The said holder is provided with the fitting hole fitted to the cross-sectional shape of the said workpiece | work, The said workpiece | work is hold | maintained by fitting the said workpiece | work to the said fitting hole, Chamfering device according to one of the claims.
The positioning surface is fixed on a table,
The holder, the rotational driving means and the biasing means are integrally moved between a chamfering position for chamfering the work and a supply position for supplying the work to the holder. The chamfering apparatus as described in any one of claim | item 1 -4.
In a chamfering method for chamfering a corner of an end face of a rod-like workpiece with a grinding stone,
Holding in the holder the workpiece whose cross section is a convex polygon, a circle, a semicircle or an ellipse;
Rotating the holder about an axis along the longitudinal direction of the workpiece;
With respect to the positioning surface which positions the work by contacting the side surface of the work or the side extending in the longitudinal direction of the work, the side and the side continue to contact the positioning surface while the holder is rotating. Biasing the holder in the direction of the positioning surface;
A chamfering method comprising at least a step of adjusting a relative position between the positioning surface and the grindstone so that the grindstone keeps in contact with the corner during rotation of the holder.

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