JP2017148872A - Work rest structure, work rest, and centerless grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work rest structure that enables a blade to be accurately positioned with a simple configuration and that cab be applied to both a vertical slide type and an inclined slide type, a work rest provided with the work rest structure, and a centerless grinder provided with the work rest.SOLUTION: A work rest structure of a centerless grinder according to the present invention is provided with; a blade 20 that supports the bottom side of the outer peripheral surface of a workpiece W; a holder 30 that holds the blade; and a rest base 40 that holds the holder via a slide surface 41 in the state of being movable in one direction, and characterized in that the holder is provided with two front and rear parallel key grooves 33 inclined with respect to a horizontal surface, the rest base is provided with two parallel keys 44 inclined with respect to the horizontal surface, and a driving mechanism 50 for simultaneously moving the two keys back and forth in the fitted state of the two keys in the two key grooves.SELECTED DRAWING: Figure 4

Description

  The present invention includes a workrest structure capable of accurately positioning a blade with a simple structure and applicable to both a vertical slide type and an inclined slide type, a workrest provided with the workrest structure, and the workrest. It relates to a centerless grinding machine.

As a grinding machine that grinds the outer periphery of a workpiece such as a cylinder or cylinder, when the longitudinal direction of the workpiece is the front-rear direction, the outer peripheral surface of the workpiece is supported from the left and right by a grinding wheel and adjustment wheel, and the workpiece rest blade A centerless grinder that supports from below is known.
The finished dimensions of the work are adjusted by adjusting the distance between the grinding wheel and the adjusting wheel, and it is necessary to change not only the distance between the grinding wheel and the adjusting wheel but also the height of the blade in accordance with the diameter of the work.

For example, Patent Document 1 discloses a work rest position changing mechanism including a base member having an inclined support surface that rises from the front to the rear, a slide member that slides on the inclined support surface, and the like. The work rest and blade are fixed to the upper part of the slide member, and by moving the slide member back and forth along the inclined support surface, the work rest is translated in the vertical direction to adjust the height of the blade. ing.
Patent Document 2 discloses a configuration in which actuators are arranged at two positions on the lower side of the cradle having a blade at the upper end. By independently controlling the driving of the front and rear actuators, the blade is translated in the vertical direction to adjust the height, or tilted back and forth as necessary.
Patent Document 3 discloses a work rest composed of a holder for holding a blade and a rest base. The rest base has a slide surface that rises from the left to the right, and adopts a guide structure in which a dovetail provided on the slide surface is fitted into a dovetail groove of the holder. By moving the holder along the slide surface, the blade is translated obliquely in the vertical direction, and the height and the horizontal position of the blade are adjusted.

JP 2009-208196 Japanese Patent No. 3965653 Japanese Examined Patent Publication No. 8-29481

However, the prior art has the following problems.
That is, in Patent Document 1, in order to move the slide member back and forth, it is necessary to lengthen the size of the base member back and forth, and the workrest itself increases in size in the front-rear direction, which leads to an increase in the size of the bed and the centerless grinding machine. There is a problem.
Further, in Patent Document 2, since two actuators are used on the front and rear sides, there is a problem that sludge generated by grinding enters the actuator drive unit, which may make it impossible to drive, and that it takes time to clean the sludge. Furthermore, since the cradle (blade) is supported only by the actuator, there is a concern about rigidity.
Further, Patent Document 3 has a problem that it takes time to process the dovetail and the dovetail, and there is a problem that it is difficult to position the blade when rattling occurs in the fitting portion. In addition, the rack and pinion mechanism that receives the load transmitted from the blade that supports the workpiece during grinding is used to move the holder up and down along the slide surface with the rack and pinion mechanism provided between the holder and the rest base. Wear and breakage of the blade may occur, and positioning of the blade may be difficult.

  Patent Documents 1 and 2 are inventions related to a vertical slide type work rest that moves a blade in the vertical direction, and Patent Documents 3 are inventions related to a tilt slide type work rest that moves a blade in a slanting vertical direction. It is preferable that the work rest structure capable of accurately positioning the blade with a simple structure can be applied to both a vertical slide type and an inclined slide type work rest.

  In view of such problems, the present invention can accurately position a blade with a simple structure and can be applied to both a vertical slide type and an inclined slide type, and a work rest provided with the work rest structure. And it aims at providing a centerless grinding machine provided with this work rest.

The work rest structure of the centerless grinding machine according to the present invention includes a blade that supports a lower portion of the outer peripheral surface of the work, a holder that holds the blade, and the holder that is movable in one direction via a slide surface. In a work rest structure of a centerless grinding machine provided with a rest base, the holder includes two parallel keyways that are inclined with respect to the horizontal plane, and the rest base is inclined with respect to the horizontal plane. It has two front and rear parallel keys, and has a drive mechanism that moves the two keys in the front-rear direction simultaneously with the two keys fitted in the two key grooves. .
Further, the slide surface is parallel to a vertical surface along the front-rear direction, and the rest base holds the holder in a state in which the holder can move in the vertical direction along the slide surface.
Further, the slide surface is inclined in the left-right direction with respect to the vertical plane along the front-rear direction, and the rest base holds the holder in a state in which the holder can move in the diagonally up-down direction along the slide surface. Features.
The work rest of the present invention is provided with the above-mentioned work rest structure.
The centerless grinding machine of the present invention includes the work rest.

In the workrest structure of the present invention, the two keys provided on the rest base are fitted in the two key grooves provided on the holder, and the two front and rear keys are simultaneously moved in the front-rear direction by the drive mechanism. The two keys slide in the two key grooves simultaneously in the front-rear direction. At this time, a diagonally upward force F acts on the inner surface of each key groove from each key. The rest table holds the holder in a state that can move in one direction via the slide surface, that is, the movement of the holder is restricted only in the one direction by the rest table. Therefore, the holder and the blade that have received the force F translate in the one direction.
In the present invention, the blade moves up and down as the two front and rear keys slide in the two front and rear key grooves, and the blade positioning accuracy depends on the processing accuracy of the key and key groove. In other words, as long as two keys and two key grooves are machined with high accuracy, the blade can be moved up and down in parallel to the horizontal plane without being inclined in the front-rear direction. Thus, the present invention can accurately position the blade with a simple structure.
Further, since the key moves in a keyway provided in the holder, the dimensions in the front-rear direction can be suppressed as compared with the structure of Patent Document 1, and the workrest itself can be downsized in the front-rear direction.

  In the case of the present invention, the load acting on the blade from the workpiece during grinding is transmitted to the two keys from the inner peripheral surface of the two key grooves of the holder, from the key to the rest base, and to the bed of the centerless grinding machine. It reaches. Compared to the case where the vertical movement of the holder and blade is performed by two actuators in the front and rear as in Patent Document 2 as in the prior art, or in the rack and pinion mechanism as in Patent Document 3, the key and key of the present invention are used. Since the groove has a simple structure, the risk of wear and damage can be reduced, and the cleaning operation can be easily performed.

The workrest structure of the present invention includes a vertical slide type in which the slide surface is parallel to the vertical surface along the front-rear direction and the rest base holds the holder in a state in which the holder can move in the vertical direction, and the slide surface in the front-rear direction. It can be applied to both of the inclined slide type in which the rest base is inclined in the left-right direction with respect to the vertical plane along which the holder is held in a state in which the holder can be moved in the diagonally up-down direction.
Further, in the present invention, it is possible to make common except for the work rest among various mechanisms such as a grinding wheel head, an adjustment carriage, and a dressing device that constitute a centerless grinding machine. That is, two types of work rests, vertical slide type and tilt slide type, are prepared, and either vertical slide type or tilt slide type can be selected and fixed to the bed according to the type of work. The versatility of the grinding machine can be improved.

Front view of the centerless grinding machine of the first embodiment Enlarged view with the blade lowered (a) and enlarged view with the blade raised (b) Left side view of work rest (a) and perspective view of key and key holder (b) Perspective view (a1), AA line cross-sectional view (a2) and BB line cross-sectional view (a3) when the workrest with the blade lowered is viewed from the left side, the workrest with the blade raised is on the left side Perspective view (b1), A'-A 'sectional view (b2) and B'-B' sectional view (b3) Front view of the centerless grinding machine of the second embodiment Enlarged view with the blade lowered (a) and enlarged view with the blade raised (b)

[First embodiment]
A first embodiment of a work rest structure, a work rest and a centerless grinding machine according to the present invention will be described. In this embodiment, a vertical slide type work rest will be described. In the following description, the rotational axis direction of the grinding wheel and the adjustment wheel is referred to as “front-rear direction”.
FIG. 1 shows a state in which the work rest 10 is installed on a centerless grinding machine 100.
On a bed 101 of the centerless grinding machine 100, a grinding wheel base 103 including a grinding wheel 102, an adjustment base 105 including an adjustment wheel 104, and a workrest 10 including a blade 20 are disposed. Further, a dressing device 106 for the grinding wheel 102 is attached to the grinding wheel head 103, and a dressing device 107 for the adjusting wheel 104 is attached to the adjusting wheel base 105.

The grinding wheel head 103 and the adjustment wheel base 105 are moved by the feeding devices 108 and 109. Although the detailed description is omitted because it is a well-known technique, the feeding devices 108 and 109 include a feed screw extending along the moving direction of the grinding wheel head 103 and the adjusting carriage 105, and a drive motor for rotating the feed screw about its axis. Further, nuts that are respectively fixed to the grinding wheel head 103 and the adjusting wheel base 105 and screwed into the feed screw are provided. The feed screw is held so that movement in the axial direction is restricted by a bracket fixed to the bed 101 and is rotatable about the axis. By rotating the feed screw with the drive motor, the grinding wheel head 103 and the adjusting wheel base 105 can be moved in directions toward and away from each other.
In the grinding operation, first, the feeding devices 108 and 109 are driven to appropriately move the grinding wheel head 103 and the adjusting wheel base 105, and the workpiece W is supported from the left and right by the grinding wheel head 103 and the adjusting wheel base 105, and the blade of the work rest 10 is used. Adjust the height of 20 to support the workpiece W from below. Then, the workpiece W is inserted between the rotating grinding wheel 102 and the adjusting wheel 104 to process the grinding wheel 102.

As shown in FIGS. 2 to 4, the work rest 10 is roughly configured by a blade 20, a holder 30, a rest base 40 and a drive mechanism 50.
The blade 20 is a member that supports the lower part of the outer peripheral surface of the workpiece W as described above. The upper end surface of the blade 20 is machined downward and becomes a contact surface with the workpiece W. The inclination angle of the upper end surface of the blade 20 with respect to the horizontal plane is not particularly limited, and examples thereof include 30 degrees (vertical angle 60 degrees of the blade 20) and 40 degrees (vertical angle 50 degrees of the blade 20).

The holder 30 is a member for holding the blade 20, and in this embodiment, when viewed from the front, the holder 30 has a substantially trapezoidal shape in which the left and right widths narrow toward the top, and is rectangular when viewed from the left and right sides. It is composed of a shaped metal plate.
With the left side surface of the blade 20 in contact with the right side surface of the holder 30, the blade 20 is fixed to the holder 30 by fastening with a bolt 32 from the right side surface of the blade 20 using a pressing plate 31.
The holder 30 is provided with two front and rear key grooves 33 which are inclined with respect to the horizontal plane on the right side surface thereof. Each keyway 33 is inclined obliquely upward at the same angle from the front to the rear, so that the two front and rear keyways 33 become parallel.
The holder 30 includes a guide groove 34 extending in the vertical direction in the center of the right side surface thereof. Detailed description of the guide groove 34 will be described later.
Ribs 35 are provided on the front and rear end faces of the holder 30, and the rigidity of the holder 30 is increased by the ribs 35 so that the left and right widths become narrower upward. The rib 35 also has a function of shielding sludge generated by grinding so that it does not scatter around.

The rest base 40 is a member for holding the holder 30 through the slide surface 41 so as to be movable in one direction. The rest base 40 according to the present embodiment includes a rectangular metal plate 42 and legs 43 extending in the front-rear direction. The left side surface of the rest base 40 is a slide surface 41, and the slide surface 41 is parallel to a vertical surface along the front-rear direction. The rest base 40 is fixed to the bed 101 via the legs 43.
The rest base 40 includes two parallel keys 44 which are inclined with respect to the horizontal plane. Specifically, as shown in FIG. 3B, two keys 44 are formed on the left side surface of a rectangular key holder 45 extending in the front-rear direction. Each key 44 is inclined obliquely upward at the same angle from the front to the rear, so that the two front and rear keys 44 are parallel.
The rest base 40 is provided with a concave portion 46 extending forward and backward on the left side surface thereof, and the key holder 45 is slidably fitted into the concave portion 46 and the two keys 44 are placed on the left side surface (slide surface 41) of the rest base 40. It protrudes from.
The rest base 40 further includes two upper and lower guide protrusions 47 at the center of its left side surface (slide surface 41). When the right side surface of the holder 30 is in contact with the slide surface 41 of the rest base 40, the guide protrusion 47 is fitted into the guide groove 34 of the holder 30, and the two front and rear keys 44 are fitted into the two front and rear key grooves 33. It comes to include. In the present embodiment, the movement of the holder 30 is restricted only in the vertical direction (vertical direction) along the slide surface 41 by the guide protrusion 47 and the guide groove 34.

  The drive mechanism 50 is provided for simultaneously moving the two keys 44 in the front-rear direction. The structure of the drive mechanism 50 is not particularly limited, but the drive mechanism 50 of the present embodiment includes a feed screw 51 extending in the front-rear direction, a drive motor 52 that rotates the feed screw 51 about its axis, and a key holding A nut (not shown) fixed to the body 45 and screwed to the feed screw 51 is formed. By rotating the feed screw 51 with the drive motor 52, the key holder 45 and the two keys 44, which are slidably fitted in the recess 46 of the rest base 40, move together in the front-rear direction. Yes.

4 (a1) to (a3) show a state in which the holder 30 and the blade 20 are positioned below (the height h ₀ of the upper end of the blade 20), and FIGS. 4 (b1) to (b3) show the holder 30 and the blade 20 A state in which the blade 20 is moved upward (height h ₁ at the upper end of the blade 20) is shown.
When the holder 30 and the blade 20 are moved upward, the drive motor 52 may be driven to move the key holder 45 forward. When the key holder 45 moves forward, the two keys 44 slide in the two key grooves 33 at the same time. At this time, the force F is obliquely upward from each key 44 to the inner surface of each key groove 33. Act. As described above, the movement of the holder 30 is restricted by the guide protrusion 47 and the guide groove 34, so that the holder 30 receiving the force F moves in the vertical direction (upward). In order to move the holder 30 and the blade 20 downward, the key holding body 45 may be moved backward by the drive motor 52.

If the holder 30 and the blade 20 are once moved to the lowest position and then moved upward by a predetermined amount, the state in which the upper surface of the key 44 is in contact with the inner surface of the key groove 33 can be maintained. Rush can be removed.
Further, as shown in FIG. 2, a known spring clamp 48 formed by stacking a plurality of leaf springs is attached to the rest base 40. The spring clamp 48 supplies a hydraulic pressure or air pressure from a port (not shown) to contract the disc spring to an unclamped state, and releases the hydraulic pressure or air pressure to a clamped state. By opening the port with the holder 30 and the blade 20 raised to a predetermined position, the holder 30 and the blade 20 are fixed to the rest base 40, and after finishing grinding, the holder 30 and the blade 20 are supplied with hydraulic pressure or air pressure from the port. The blade 20 is made movable. The method for fixing the holder 30 and the blade 20 to the rest base 40 is not limited to the spring clamp 48, and a known method can be used.

The vertical slide type work rest 10 shown in the present embodiment generally has the following characteristics.
・ The protrusion ratio (amount) of the workpiece W is constant. ・ The slide stroke is small for the diameter change of the workpiece W. ・ The core height is large. ・ It can be used for workpieces W with significantly different wall thicknesses such as needle gauges and bearings.

[Second Embodiment]
Next, a second embodiment of the work rest structure, the work rest, and the centerless grinding machine of the present invention will be described, but the same reference numerals are given to the parts having the same configuration as the first embodiment. Therefore, the description is omitted.
The present embodiment is characterized in that the workrest structure of the present invention is applied to an inclined slide type workrest.
Specifically, as shown in FIGS. 5 and 6, the plate body 62 of the rest base 61 of the work rest 60 is fixed to the leg portion 63 so as to be inclined with respect to the horizontal plane. The inclination angle is not particularly limited. For example, when the inclination angle of the upper end surface of the blade 20 with respect to the horizontal plane is 30 degrees (vertical angle of the blade 20 is 60 degrees), the inclination angle of the plate body 62 is about 45 degrees. When the inclination angle of the upper end surface is 40 degrees (vertical angle of the blade 20 is 50 degrees), the inclination angle of the plate body 62 is preferably about 40 degrees.

  The holder 70 has a bent shape composed of an inclined portion 71 inclined parallel to the inclination angle of the plate body 62 and a vertical portion 72 extending in the vertical direction from the upper end of the inclined portion 71. The movement of the holder 70 is restricted only in the inclination direction along the slide surface 64 by a guide projection (not shown) and a guide groove (not shown).

In the case of the inclined slide type work rest 60 as in the present embodiment, the following features are generally provided.
・ Because the center of the work W is constant, it is advantageous for connecting bar feeders and multiple lines. ・ The slide stroke is large for the diameter change of the work W. ・ The center height operation fee is small. If the work rest structure of the present invention is employed, the centerless grinding machines 100 and 200 can share the rest of the work rests 10 and 60. That is, prepare two types of work rests 10 and 60, vertical slide type and tilt slide type, and select either vertical slide type or tilt slide type according to the type of work W and fix it to the bed 101. Therefore, the versatility of the centerless grinder can be enhanced.

  The present invention includes a workrest structure capable of accurately positioning a blade with a simple structure and applicable to both a vertical slide type and an inclined slide type, a workrest provided with the workrest structure, and the workrest. It relates to a centerless grinder and has industrial applicability.

F force
W Work
10 Work rest
20 blades
30 holder
31 Holding plate
32 volts
33 Keyway
34 Guide groove
35 ribs
40 Rest stand
41 Slide surface
42 plate
43 legs
44 key
45 Key holder
46 Recess
47 Guide protrusion
48 Spring clamp
50 Drive mechanism
51 Lead screw
52 Drive motor
60 Work rest
61 Rest stand
62 Plate
63 Leg slide surface 64
70 holder
71 Slope
72 Vertical section
100 centerless grinding machine
101 beds
102 Grinding wheel
103 Grinding wheel head
104 Adjustment car
105 Adjustable chassis
106 Dressing equipment
107 dressing equipment
108 Feeder
109 Feeder
200 Centerless grinding machine

Claims (5)

A work rest for a centerless grinding machine, comprising: a blade that supports a lower portion of an outer peripheral surface of a workpiece; a holder that holds the blade; and a rest base that holds the holder in a state movable in one direction via a slide surface. In structure
The holder includes two parallel keyways that are inclined with respect to a horizontal plane;
The rest base is provided with two parallel keys front and rear inclined with respect to a horizontal plane,
A work rest structure for a centerless grinding machine, comprising: a drive mechanism that simultaneously moves the two keys in the front-rear direction while the two keys are fitted in the two key grooves.
The sliding surface is parallel to a vertical surface along the front-rear direction;
2. The work rest structure according to claim 1, wherein the rest base holds the holder in a state of being movable in the vertical direction along the slide surface.
The sliding surface is inclined in the left-right direction with respect to the vertical plane along the front-rear direction;
2. The work rest structure according to claim 1, wherein the rest base holds the holder in a state in which the holder can move in an obliquely vertical direction along the slide surface.
A work rest comprising the work rest structure according to any one of claims 1 to 3.
5. A centerless grinding machine comprising the work rest according to claim 4.

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