JP2002307267A - Centerless grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a centerless grinder to grind the peripheral wall of a work in such a condition that swings of the axis of the work are restricted. SOLUTION: The centerless grinder is equipped with a dial gauge 17 to move a top rail 30 and change the interval between the top rail 30 and a blade 40, whereby it is possible that the top rail 30 is moved by the dial gauge 17 and the gap between the peripheral wall of the work 50 supported by the blade 40 and the top rail 30 is set to such a degree as capable of restricting the swings of the axis of the work 50 by the blade 40 and top rail 30. Accordingly the peripheral wall of the work 50 can be ground while the swings of the axis of the work 50 are restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a centerless grinding machine.

[0002]

2. Description of the Related Art A centerless grinding machine is a device for grinding an outer peripheral wall surface of a generally cylindrical work. The work is ground by a high-speed rotating grinding wheel while rotating the work on a blade by an adjusting grindstone. Since the adjusting wheel and the grinding wheel are arranged so that their rotating axes are slightly inclined from the parallel positional relationship, the workpiece that is in contact with the adjusting wheel and the grinding wheel moves in the axial direction as the wheel rotates. I do. Since the swing of the rotating shaft of the work is suppressed by contacting the outer peripheral wall of the work with the grinding wheel, the adjusting grindstone and the blade, the outer peripheral wall of the work is ground without supporting the rotating shaft of the work, for example, Roundness can be improved. In addition, a centerless grinding machine is known which includes a top rail opposed to a blade with a work interposed therebetween in order to prevent double loading of the work, floating of the work, and the like.

[0003]

However, as in the maraca-like work 50 shown in FIG. 3, the contact length between the cylindrical side wall of the work 50 and the blade is shorter than the axial length of the work 50. When machining a complicated work, the conventional centerless grinding machine cannot suppress the swing of the axis of the work 50. For this reason, in the conventional centerless grinding machine, the corners of the unstable work are sharpened more than the central part, and the distorted cylindrical side walls whose diameter is smaller at both ends in the axial direction than in the central part are formed. As a result, high-precision processing was difficult.

[0004] It is an object of the present invention to provide a centerless grinder for grinding the outer peripheral wall of a work while restricting the swing of the axis of the work.

[0005]

According to the centerless grinding machine of the present invention, since the adjusting means for moving the top rail and changing the interval between the top rail and the blade is provided, the work is sandwiched between the top rail and the blade. The swing of the axis of the work can be regulated. That is,
According to the centerless grinding machine of claim 1, the top rail is moved by the adjusting means, and the outer peripheral wall of the work supported by the blade and the top rail are moved to such an extent that the swinging of the axis of the work is regulated by the blade and the top rail. Can be set. Therefore, the outer peripheral wall of the work can be ground while restricting the swing of the axis of the work.

According to the centerless grinding machine of the second aspect, the adjusting means changes the distance between the top rail and the blade at two places separated in the longitudinal direction of the top rail. Can be set to be smaller as the process proceeds. Therefore, according to the centerless grinding machine according to the second aspect, even when the work progresses as the work advances in the axial direction and the outer diameter of the work becomes smaller, it is possible to restrict the swing of the work center.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing an embodiment of the present invention will be described below. FIG. 1 is a schematic diagram showing a centerless grinding machine 1 according to one embodiment of the present invention. The grinding wheel 20 has a cylindrical sidewall-shaped grinding portion 21 formed on the outer periphery.
The grinding wheel 20 is rotatably supported by the base 70, and is driven by a motor (not shown) or the like to rotate at high speed.

The adjusting grindstone 60 has a cylindrical wall-shaped contact portion 61 formed on the outer periphery. The adjusting grindstone 60 is rotatably supported by the base 70, and is driven and rotated by a motor (not shown) or the like. In order to rotate the metal workpiece 50 by rotating the adjusting grindstone 60, a part or all of the contact part 61 is formed of an elastic material having a high friction coefficient such as rubber.

The grinding wheel 20 and the adjusting wheel 60 are supported on a base 70 such that their respective rotation axes are substantially parallel to each other. The distance between the grinding wheel 20 and the adjusting wheel 60 is
The work 50 is set in accordance with the diameter of the work 50 so that the work 50 moves in the axial direction by rotating the grinding wheel 20 and the adjustment grindstone 60 when the work 50 contacts the two.
It is slightly narrowed in the direction of travel of zero.

A blade 40 and a top rail 30 are provided between the grinding wheel 20 and the adjusting wheel 60 so as to face each other in the vertical direction. Blade 40 and top rail 3
Numerals 0 are both provided on the base 70 so as to be movable in the vertical direction. The blade 40 is formed in a plate shape substantially parallel to the rotation axes of the grinding wheel 20 and the adjusting wheel 60. Work 50
The upper end surface 41 of the blade 40 abutting on is located slightly above a straight line connecting the central axis of the grinding wheel 20 and the central axis of the adjusting wheel 60.

FIG. 2 shows the centerless grinding machine 1 viewed from the direction of arrow II in FIG. However, the adjustment grindstone 60 to be seen from the front is indicated by a broken line for convenience. Top rail 30
Is a plate-like member provided substantially on the same plane as the blade 40. Both ends of the top rail 30 are suspended portions 14 and 15
Is suspended on the base 70. The suspension portions 14 and 15 have a non-movable portion on the base 70 side and a movable portion on the top rail 30 side, and the movable portion can expand and contract in the vertical direction. As shown in FIG. 2, the intervals at which the dial gauges 10 and 11 are provided are considerably larger than the length in the longitudinal direction of the lower end surface 31 of the top rail 30 abutting on the work 50. This is because the distance between the lower end surface 31 of the top rail 30 and the upper end surface 41 of the blade 40 can be finely adjusted by the dial gauges 10 and 11.

Dial gauges 10, 1 as adjusting means
1 is fixed to the non-movable portion of the suspension portions 14 and 15 on the base 70 side or the base 70. Each of the dial gauges 10 and 11 has a stylus 12 and 13 that can reciprocate in the vertical direction.
3 is in contact with the upper end surface of the top rail 30.
The dial gauges 10 and 11 have a mechanism for moving the styluses 12 and 13 in the vertical direction by rotating the dials 16 and 17.

The configuration of the centerless grinding machine 1 has been described above. Hereinafter, an operation of grinding the outer peripheral wall of the work 50 by the centerless grinding machine 1 will be described. The work 50 is continuously supplied from the supply device (not shown) to the blade 40.
Is transferred between the upper end surface 41 of the top rail 30 and the lower end surface 31 of the top rail 30. As shown in FIG. 1, the work 50 is a grinding wheel 2
0, abuts the adjusting whetstone 60 and the blade 40. The grinding wheel 20 and the adjustment wheel 60 rotate in the same direction as each other as indicated by arrows A and B shown in FIG. Adjustment whetstone 60 and work 5
0, the workpiece 50 is rotated by rotating the adjusting grindstone 60, and the adjusting grindstone 60 and the grinding grindstone 2 are rotated.
The workpiece 50 moves in a direction in which the interval between the workpiece 50 and the zero decreases. The grinding wheel 20 grinds the outer peripheral wall surface of the workpiece 50 that moves while rotating between the adjusting wheel 60 and the grinding wheel 20.

The top rail 30 is a dial gauge 10,
11 can be moved in the vertical direction by adjusting 11. Further, as shown in FIG.
Are in contact with the upper end surface of the top rail 30 at positions spaced apart in the longitudinal direction of the top rail 30, and the lower end surface 31 of the top rail 30 is adjusted by adjusting the dial gauges 10, 11 individually. Can be changed. Since the outer peripheral wall is gradually ground while the work 50 advances in the axial direction (the left-right direction in FIG. 2), the front end of the top rail 30 in the work progress direction approaches the blade 40 from the rear end in the work progress direction. Set to The distance between the outer peripheral wall surface of the work 50 supported by the blade 40 and the lower end surface of the top rail 30 is equal to the work 50
The rotation and the movement in the axial direction are substantially limited, and the clearance is set to such a small value that the center axis of the work 50 does not swing.

When the grinding wheel 20 grinds the outer peripheral wall surface of the work 50, the axis of the work 50 tends to swing due to the frictional force between the grinding wheel 20 and the work 50. However, as long as the distance between the lower end surface 31 of the top rail 30 and the outer peripheral surface of the work 50 is appropriately set, the pivot of the work 50 does not swing. This is because, when the axis of the work 50 swings, the lower end surface 31 of the top rail 30 comes into contact with the outer peripheral surface of the work 50 in the form of a cylindrical side wall.

According to one embodiment of the present invention, the upward movement is restricted by the lower end surface 31 of the top rail 30, so that even if there is an unstable work shown in FIG. The outer peripheral wall of the work 50 can be ground while restricting the movement. The work 50 is a valve seat for a fuel injection pump, and includes a seat portion 51 in which a forked fluid passage 52 is formed and a shaft portion 53. A cutout 54 is formed in a part of the corner of the seat portion 51 on the shaft portion 53 side. The diameter of the seat portion 51 is larger than the diameter of the shaft portion 53. Further, the inclination angle of the top rail 30 is adjusted by the two dial gauges 10, 1 and 2.
Since the adjustment can be performed by the step 1, even when the work advances as the work 50 advances in the axial direction and the outer diameter of the work 50 is reduced, it is possible to restrict the swing of the axis of the work 50.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a centerless grinding machine according to one embodiment of the present invention.

FIG. 2 is a schematic diagram showing a centerless grinding machine according to one embodiment of the present invention.

3A and 3B are views showing a work of a centerless grinding machine according to one embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Centerless grinder 10, 11 Dial gauge 14, 15 Suspension part 20 Grinding grindstone 21 Grinding part 30 Top rail 40 Blade 50 Workpiece 60 Adjusting grindstone 70 Base

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C034 AA01 BB79 3C043 AA08 CC03 DD05

Claims (2)

[Claims] 1. A centerless grinding machine for grinding an outer peripheral wall surface of a work, comprising: a cylindrical side wall-shaped adjusting grindstone for rotating by rotating while contacting the outer peripheral wall surface of the work; A cylindrical side-wall-shaped grinding wheel that rotates while contacting and grinding the work; a blade that supports the work rotatably and movably in the axial direction between the adjusting grindstone and the grinding wheel; an outer periphery of the work A top rail capable of abutting against a wall surface on the opposite side of the blade and restricting swinging of the axis of the work; and adjusting means for moving the top rail to change a distance between the top rail and the blade. A centerless grinding machine comprising: 2. The centerless grinding machine according to claim 1, wherein said adjusting means changes the interval between said top rail and said blade at two locations spaced apart in the longitudinal direction of said top rail.