JP2922614B2 - Chamfering method for arc-shaped sintered material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for chamfering an arc-shaped sintered material (hereinafter abbreviated as a work).

(Conventional example) The work is a sintered brittle material, which is generally arc-shaped as shown in FIG. 4, and has an outer peripheral surface 2, an inner peripheral surface 3 and both ends which form a part of a substantially cylindrical shape. With a flat end face 6
The outer peripheral surface (hereinafter referred to as the surface) 2 has a first ridge line 4 which is one outer peripheral edge of an arc-shaped outer peripheral edge and a second ridge line 5 which is the other opposing outer peripheral edge. Work 1
There are molding burrs and firing burrs on the ridge line, and they are easily chipped and brittle. In addition, the ridgelines 4 and 5 are chamfered before grinding the surface 2 for various workability and safety.

An apparatus for this chamfering is disclosed as a chamfering apparatus for C-shaped products in Japanese Patent Application Laid-Open No. 2-100305. In this apparatus, a work is fixed to a rotating plate provided in an indexing device with a belt, and a cup grindstone is movably provided for a work that moves in an inching manner, thereby chamfering the work.

Further, in the method and apparatus for chamfering a ceramic white background disclosed in JP-A-62-293761, a ceramic white background is placed on a conveyor table, the white background is regulated and conveyed, and a pair of grindstones are used to chamfer the table. Discloses that a white background is horizontally inverted by 90 degrees, and the other portion is chamfered by a pair of whetstones moving up and down.

(Problems to be Solved by the Invention) In Japanese Patent Application Laid-Open No. Hei 2-100305, the entire length of a ridge line for chamfering a work is ground and chamfered by contacting the cup-type grindstone along the rotation direction thereof. Since the portion where the circular arc and the ridge line of the peripheral surface of the grindstone are always in contact is the same, the grinding load is large, the grindstone is locally worn, and the life of the grindstone is short. Also,
Since the length of contact between the grindstone and the ridgeline in the processing direction is long, water for cooling with water is not distributed to the grinding portion, and the water at the grinding portion is not sufficiently cooled. Therefore, a thermal crack occurs in the work. In addition, the workpiece moves inching and the cup-shaped grindstone moves in and out each time, so that the operation is intermittent and the productivity of chamfering is low.

In JP-A-61-293761, the ridge lines on both sides to be chamfered are parallel to the transport direction, and the ridge lines are chamfered with a flat whetstone during the transport, so that the chamfer is limited to a straight line. Further, since the flat grindstone follows the uneven ridge line by horizontally reversing the work, the contact time between the grindstone and the ridge line must be long, and the productivity is low. That is, since the chamfering is performed from the leading edge to the trailing edge of the ridgeline with the movement of the work, the substantial transport speed of the work must be reduced.

The present invention provides a method of chamfering an arc-type sintered material which can improve the conventional disadvantages, increase the productivity by continuous operation, and realize a longer life and a reduced load on the grinding wheel. The purpose is to:

(Means for Solving the Problems) The present invention relates to an arc-shaped sintered material, which includes an arc-shaped edge, which is an edge formed by an arc-shaped outer peripheral surface and an end surface in contact with the arc-shaped outer peripheral surface, Using a generally cylindrical grindstone such that the grinding surface is in contact with the entire area of the ridge line, the whole grindstone is rotated around the central axis of the substantially cylindrical column, and the grinding surface and the ridgeline are contacted at a predetermined chamfer angle. Then, in the method for chamfering the arc-shaped sintered material for chamfering the ridge line, the arc-shaped sintered material is formed such that a first ridge line, which is one of the edges forming the arc shape, faces obliquely upward. The arc-shaped sintering material is passed through the grinding surface of the first forming grindstone, which is inclined at a predetermined angle and has a partially elliptical concave portion corresponding to the shape of the first ridgeline, while making contact with the substantially entire length of the first ridgeline. Substantially the entire length of the first ridgeline, and then the other edge facing the edge The arc-shaped sintered material is inclined at a predetermined angle so that the second ridge line portion, which is the edge of the second ridge line, faces obliquely upward, and a second general-purpose grindstone having a partially elliptical concave portion corresponding to the second ridge line shape is formed. The arc-shaped sintered material is allowed to pass through the ground surface while contacting substantially the entire length of the second ridge line,
It is characterized in that substantially the entire length of the second ridge is chamfered.

(Detailed Description of the Invention) One embodiment of the present invention will be described in detail with reference to FIGS.

The work has a shape as shown in FIG. 4 described in the section of the conventional example.

A chamfering device 11 shown in FIG. 1 is arranged above an endless belt 14 provided with a support base 15 for a workpiece 1 and at predetermined intervals along a traveling direction thereof, and a grinding surface rotates along the traveling direction. A first forming grindstone 16 and a second forming grindstone 17, and a reversing device 18 for the work 1 provided therebetween;
The supply device 12 and the discharge device 13 are connected before and after the chamfering device 11. The grinding surface of the forming grindstone is prepared in accordance with the shape of the ridge line to be chamfered.

The supply device 12 aligns the workpiece 1 on the inclined guide 20 so that the ridges thereof are in contact with each other, and swings the holding piece 21 with the shaft 23 interlocking with the chamfering device 11 to slide down the workpiece 1 one by one. The ridge line can be supplied to the support 15 in a direction perpendicular to the traveling direction of the endless belt 14.

An endless belt (hereinafter abbreviated as a belt) 14 of the chamfering device 11 is a chain or a flat belt, and the driving device drives the support table 15 cyclically in the horizontal direction.

The discharge device 13 is provided with a guide 90 on the downward plate 91,
The chamfered works 1B released from the work can be slid down one by one.

FIG. 2 shows the support 15, the first forming grindstone 16, and the reversing device 18. The belt 14 advances in the direction of arrow X,
16 is provided so as to rotate in the direction of arrow L. The support 15 is
A base 30, a support plate 31, and a roller guide 36 are provided.

The support plate 31 is composed of a pair of members mounted in parallel on the base 30 along the traveling direction of the belt 14, so that the upwardly inclined surface 34 and the downwardly inclined surface 33 intersect. In this manner, a mountain shape 37 is formed, and regulating surfaces 35 and 32 for supporting the work 1 are provided at the lower ends of the respective surfaces so as to intersect. That is, the first valley, the chevron 37 and the second
A valley is formed. The upper inclined surface 34 or the lower inclined surface 33 of the chevron 37 supports the inner peripheral surface 3 of the work 1. If the distance between the support plates 31 is made variable, it is possible to cope with works 1 of various dimensions. Further, when the vicinity of the top of the mountain shape 37 is formed in an arc shape, the reversal of the work 1 becomes smoother. A lateral regulating plate 38 is provided outside the chevron 37 to regulate the displacement of the work 1. The surface that supports and contacts the work 1 is made of durable material such as stainless steel, ceramic, chrome plating, etc.
Water is supplied to the chamfer for cooling and cleaning.

The roller guide 36, which is a reversing device, is a roller 41 of the reversing device 18.
The roller 41 is provided so as to move up and down as the work 1 advances.

The reversing device 18 reverses the work 1A, in which the first ridge 4 is chamfered by the first forming grindstone 16, so that the second ridge is directed obliquely upward.

Reversing lever that contacts one end surface 6 and surface 2 of work 1A
40 is connected to the guide lever 47 via the pin 46 and to the spring 42 and the spring 43.

The spring 42 is a guide lever 47 provided with a rotatable roller 41.
And the guide lever 47 is guided via the guide plate 45.
Provided to move along 44. The other end of the spring 43 is fixed.

In the chamfering device thus configured, chamfering is performed as follows.

The works 1 are supplied one by one to a support 15 of an endless belt 14 by a supply device 12. Work 1 is supported on a support 15
The inner peripheral surface 3 is supported by the downward inclined surface 33, the one end surface 6 is held by the regulating surface 32, the position in the traveling direction is regulated by the lateral regulating plate 38, and the outer peripheral surface 2 faces the traveling direction at a predetermined angle. The first ridge line 4 tilts and moves straight in a mounted state in which the first ridge line 4 faces obliquely upward. That is, since the position of the first ridgeline 4 of the work 1 is regulated so as to be in contact with the grinding surface 50 of the first forming grindstone 16 in a direction perpendicular to the traveling direction, the work 1 is When passing below, substantially the entire length of the first ridge line 4 is ground at right angles in the grinding surface 50 of the first forming grindstone 16, and is chamfered instantaneously.

Since the shape of the grinding surface 50 is formed according to the shape of the ridge line to be chamfered, and the traveling direction of the work 1 and the grinding direction are matched, grinding can be performed quickly with less load. The direction of rotation of the grinding surface 50 enables the work 1 to be more pressed against the support plate 13 of the support base 15 to prevent the work 1 from being displaced. For this reason, it is sufficient for the work 1 to be supported without being fixed.

The work 1A that has passed through the first mold wheel 16 is turned and turned over from the lower inclined surface 33 by the reversing device 18 during movement, and is moved on the upper inclined surface 34, and the inner peripheral surface 3 is directed in the traveling direction to a predetermined position. With the angle of inclination of the second ridgeline 5 facing diagonally upward, the second ridgeline 5 is sent toward the second forming grindstone 17.

2 shows a state in which the reversing device 18 has started reversing the work 1A, and FIG. 3 shows a reversal locus of the work 1A by the reversing lever 40.

When the support base 15 moves and the roller guide 36 comes to a position where it comes into contact with the roller 41 of the reversing device, the reversing lever 40 moves the work 1A.
The lower end surface 6 is substantially in contact with the surface 2. As the support 15 moves further, the roller 41 moves along the path restricted by the roller guide 36 and the guide 44, whereby the reversing lever 40 moves as shown by O1 to O5 at the corners thereof. To go. At this time, work 1A is the reversing lever
It is dragged by 40 and slides upward along the downwardly inclined surface 33, and then the posture is reversed in the opposite direction at the vertex portion 63 of the chevron 37. At this time, the corner of the reversing lever 40 is indicated by O6,
Leaves 1A and becomes selfish.

When the reversal starts, the work 1A immediately slides down on the upper inclined surface 34, and the reversal operation is completed. The corner of the reversing lever 40 descends from O7 to O10 as shown at O10, and waits for the next workpiece 1A to be transported. The roller 41 rolls along the up surface 60, the top surface 61, and the down surface 62 of the roller guide 36, and
The 40 corners are regulated so as to follow the locus from O1 to O10.

The inverted work 1A 'has its second ridge line directed obliquely upward, and when it passes under the second forming grindstone 17 in the mounted state, it is chamfered by the grinding surface rotating in the R direction. Is done.

As long as the first and second ridge lines are substantially parallel and opposed to each other, even if the curvatures are different, it can be applied by selecting the grinding surface shape of the forming grindstone according to the curvatures. Angle to bevel
It can be arbitrarily determined at 37 setting angles.

(Effects of the Invention) In order to chamfer two ridge lines on the front side of the work, the first ridge line is chamfered with the first forming grindstone while the work is continuously transported with the work placed thereon, and then the second ridge line is chamfered. Since the second ridge line is inclined at a predetermined angle so that it faces diagonally upward, the second ridge line is chamfered with the second forming grindstone, and the fixture and fixing time of the work are not required, so productivity is exceptional. And beveling can be performed efficiently.

Further, since almost the entire length of the ridge line on the front surface side of the work is ground in a direction perpendicular to the rotary grinding surface of the forming grindstone, the load can be instantly ground with little load, and the life of the grindstone can be extended.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of the chamfering device of the present invention. FIG. 2 is a layout diagram of a support table, a forming grindstone, and a reversing device. FIG. 3 is a diagram showing a reversal locus of a workpiece. FIG. , 11: beveling device, 14: belt, 15: support base, 16:
A first forming wheel, 17: a second forming wheel, 18: a reversing device.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-100305 (JP, A) JP-A-60-25644 (JP, A) JP-A-63-57166 (JP, A) JP-A-61- 293761 (JP, A) Japanese Utility Model Showa 54-70946 (JP, U) Japanese Utility Model Showa 57-140949 (JP, U) Japanese Utility Model Showa 57-140948 (JP, U) (58) Field surveyed (Int. ⁶ , DB name) B24B 9/00 601 B24B 9/06

Claims (1)

(57) [Claims] An arc-shaped outer peripheral surface of an arc-shaped sintered material and an edge formed in contact with the arc-shaped outer peripheral surface are formed so that a ridge, which is an arc-shaped edge, is in contact with the entire ridge portion. An arc for chamfering the ridge line by rotating the general-shaped grindstone around the central axis of the substantially cylindrical column and bringing the grinding surface and the ridge line into contact with each other at a predetermined chamfer angle while using a substantially columnar forming wheel. In the chamfering method for the shaped sinter, the arc shaped sintered material is inclined at a predetermined angle so that a first ridge, which is one of the edges forming the arc, faces obliquely upward, The arc-shaped sintered material is allowed to pass through the arc-shaped sintered material while abutting almost the entire length of the first ridge line on the grinding surface of the first mold wheel having a partially elliptical concave portion corresponding to the shape, so that the entire length of the first ridge line is reduced. Chamfering, and then the second ridge line which is the other edge opposite to the edge is The arc-shaped sintered material is inclined at a predetermined angle so as to face upward, and the entire length of the second ridgeline is substantially equal to the grinding surface of the second mold wheel having a partially elliptical concave portion corresponding to the second ridgeline shape. A chamfering method for the arc-shaped sintered material, wherein the arc-shaped sintered material is allowed to pass through while abutting on the second ridge line, and substantially the entire length of the second ridge is chamfered.