JPH1177494A - Work carry-out device in grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clogging of work by surely carrying out a processed work with a simple structure, in a grinding machine of so-called centreless grinding type. SOLUTION: In a grinding machine for working grinding while holding work by vertical work support rollers 16, 24 and a shoe, an work W1 pushed out from a work position by raw work W2 supplied from the shoe 28 side is taken out. The device is provided with a claw supporting member 42 for rotatably supporting the claw member 44, and a claw transferring means for moving the claw supporting member 42 in advance and retreat. The claw member 44 is provided with a lower claw 52, and the claw 52 is interrupted between the already worked work W1 and the raw work W2 while rotating the claw member 44. The claw member 44 and the claw supporting member 42 are moved in retreat from this interrupting condition, and thereby, the already worked work W1 is drawn in a side separated from the shoe 28 by the claw 52, and the already worked work W1 is forcibly delivered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for unloading a processed work in a grinding machine for performing a grinding process while supporting the work from the outside with a work supporting roller and a shoe.

[0002]

2. Description of the Related Art Conventional grinding machines include a normal type in which a work is directly gripped by a chuck, and a so-called centerless work in which a grinding operation is performed while holding the work from the outside using rollers and shoes. There is a grinding system (for example, see Japanese Patent Application Publication No. 88-12064, Invention Association). An outline of this type of grinding machine is shown in FIG.

In the drawing, a work supporting roller 9 is vertically arranged.
1 and 92 are arranged, and a shoe 94 is fixed at a height position between the rollers 91 and 92, and a position surrounded by these three members is a processing position. When the work W1 is set at this processing position, the upper and lower work support rollers 91 and 92 are driven to rotate, and the work W1 is rotated.
Grinding of the workpiece W1 is advanced while the workpiece 1 is driven to rotate.

After the grinding of the work W1 is completed, the upper work supporting roller 92 is lifted to a position higher than the position shown in the figure, and the unworked work is moved along the upper surface of the shoe 94 toward the above-mentioned working position. W2 is supplied. Then, the processed work W1 is formed by the unprocessed work W2.
Is pushed out of the processing position, and the lower work supporting roller 91 is
While being discharged while rolling down, the unprocessed work W2 is set at a new processing position, and is switched to a state where the work W2 can be ground. Therefore,
According to this type of grinding machine, the work of attaching and detaching the work to and from the chuck is not required, and the work can be efficiently mass-produced.

[0005]

In the above grinding machine,
In particular, when the work W1 is lightweight, the work W1 pushed out of the processing position is completely removed due to the pressure of the coolant sprayed on the processing position and the resistance due to the viscosity of the oil adhering to the lower work supporting roller 91. Without rolling down
There is a possibility that the toner may stay on the peripheral surface of the lower support roller 91.
If the unprocessed work is successively supplied to the processing position while such a stagnation occurs, the work is clogged at the processing position, causing a problem that the continuous supply of the work becomes impossible.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a device capable of reliably carrying out a processed work with a simple configuration and preventing work clogging in a so-called centerless grinding type grinding machine. I do.

[0007]

As means for solving the above problems, the present invention provides a work supporting roller for supporting a work from above and below, a shoe for supporting the work from the side, and a shoe on the same side as the shoes. And a work supply means for supplying an unprocessed work toward the processing position between the two work support rollers from the work support roller. In a grinding machine that is configured to be extruded and set at a new processing position, a downwardly protruding shape between the unprocessed work at the processing position and the processed work extruded by the unprocessed work is provided. A claw member having a claw, and an interrupting position at which the claw can be interrupted between the unprocessed work and the processed work, and a position above the interrupting position. A claw support member that is movable between the retracted position and the claw member and supports the claw member in a state where the claw member is urged toward the interrupting position; A claw transfer means for moving the claw forward and backward between the shoe and the retreat position farther from the shoe than the advancing position, and the claw supporting member retreats from a state where the claw is at the interruption position, whereby the claw is moved. The above-mentioned processed work is configured to be drawn into the discharge side.

In the above configuration, the grinding is performed in a state where the work is held at the processing position by the two work supporting rollers and the shoe. Then, after the processing is completed, the unprocessed work is supplied toward the processing position, whereby the unprocessed work pushes out the processed work from the processing position, and the unprocessed work is newly set at the processing position. If you advance the claw support member before and after this unprocessed work set,
With the rotation of the claw member, the claw can be inserted between the processed work and the unprocessed work, and if the claw support member is retracted from this state, the claw allows the processed work to be discharged to the discharge side. (Ie, forced discharge).

Specifically, in the case where there is provided transfer control means for controlling the operation of the claw transfer means so that the claw reaches the interrupt position before the unprocessed work reaches the processing position, By setting the shape of the claw such that the processed work pushed out from the processing position by the unprocessed work pushes the claw at the interruption position and passes below the claw, the claw can be inserted between the two works. it can.

On the other hand, in the case where the claw is provided with transfer control means for controlling the operation of the claw transfer means so that the claw reaches the interruption position after the unprocessed work reaches the processing position. By setting the shape of the nail so as to ride on the processed workpiece and reach the interruption position, the nail can be inserted between the two workpieces.

The transfer control means may control the operation of the claw transfer means independently of the operation control of the work supply means. However, the transfer control means may serve as a work supply means for pushing an unprocessed work to a processing position. Equipped with a fluid pressure cylinder,
As the claw transfer means, a carry-out fluid pressure cylinder for moving the claw support member forward and backward is provided, and as the transfer control means,
If a switching valve is provided for simultaneously switching the supply and discharge of the working fluid to both fluid pressure cylinders and simultaneously performing the supply operation of the unprocessed work and the forward movement of the claw support member, a single switching valve is used. With only a simple configuration, it is possible to reliably synchronize the operation of the work supply means with the operation of the work unloading means.

[0012]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG.

In this embodiment, an internal grinding machine is shown as a grinding machine to which the present invention is applied. This grinding machine includes a base 10 as shown in FIG. 1, and a main body frame 12 is erected on the base 10.

A lower work support roller 16 is attached to the main body frame 12 so as to be rotatable about a horizontal rotating shaft 14, and a processing motor (not shown) is connected to the lower work support roller 16. I have. Further, near the lower work supporting roller 16, there is provided an out chute 18 for guiding the processed work W that falls down on the lower work supporting roller 16 to a predetermined discharge position.

An arm 22 is attached to the main body frame 12 so as to be rotatable about a horizontal rotation shaft 20. The upper end of the arm 22 is rotatably mounted on a rotation end of the arm 22 about a rotation shaft 23. A roller 24 is mounted. The upper work supporting roller 16 is connected to the processing motor via a belt (not shown), and the upper and lower work supporting rollers 16 and 24 are simultaneously driven to rotate by the operation of the processing motor. . These work support rollers 16 and 24 are vertically arranged at positions where their rotating shafts 14 and 23 are shifted in the front-rear direction (the left-right direction in FIG. 1), and the upper work support roller 24 is urged downward by its own weight. It is in a state of being left.

The present invention can be applied to a case where only one of the upper and lower work supporting rollers 16 and 24 is used as a driving roller and the other is used as a driven roller.

A shoe mounting member 26 extending horizontally is fixed to the main body frame 12.
The shoe 28 is fixed to the tip of the shoe in a horizontal state. In this embodiment, the upper surfaces of the shoe mounting member 26 and the shoe 28 are flush with each other, and the tip of the shoe 28 faces a position between the work support rollers 16 and 24.

As shown in FIG. 2, both work supporting rollers 1
A backing plate 25 is provided on the back side of each of the workpieces 6, 24, and a front plate 27 is provided on the front side thereof. The workpiece W is positioned between the plates 25 and 27. The position where the roller 28 and the two work supporting rollers 16 and 24 are simultaneously contacted is the normal processing position. Then, the front plate 27 is placed inside the cylindrical workpiece W held at this processing position.
Grinding wheel 29 through through hole 27a provided in
Is to be inserted.

As shown in FIG. 1, the shoe mounting member 2
A work storage tube 30 is provided above the work storage tube 6. A large number of unprocessed works W are stored in the work storage tube 30 in a vertically arranged state, and the works W are supplied onto the shoe mounting member 26 one by one by their own weight. A supply hydraulic cylinder 32 is disposed behind (to the right in FIG. 1) the replenishing position, and a pusher 34 is fixed to a distal end of a telescopic rod of the cylinder 32. Then, with the extension of the supply hydraulic cylinder 32, the pusher 34 advances on the mounting member 26, and the work W
Is pushed from the rear to the above-mentioned processing position, and the processed work W held at this processing position is pushed out from the processing position to the discharge side (the left side with the out chute 18 in FIG. 1). .

Further, in this grinding machine, an unloading hydraulic cylinder 36 is disposed at a position facing the shoe 28 with the work supporting rollers 16 and 24 interposed therebetween, and a distal end of a telescopic rod 38 of the unloading hydraulic cylinder 36 is provided. , FIGS. 3A and 3B
A work carrying member 40 as shown in FIG.

The work carrying member 40 is provided with the claw supporting member 4.
2 and a claw member 44, and a rear portion 43 of the claw support member 42 is fastened to a distal end portion 39 of the telescopic rod 38 by a bolt 45. Then, the unloading hydraulic cylinder 36
The expansion / contraction stroke of the cylinder 36 is set such that the entire work carry-out member 40 advances and retreats between the forward position shown by the solid line in FIG. 3B and the retracted position shown by the two-dot chain line in FIG. I have.

The claw member 44 extends in the front-rear direction, and its rear end (the left end in FIGS. 3A and 3B) is attached to the claw support member 42 so as to be rotatable about a horizontal shaft 46. . The claw member 44 has a claw 52 projecting downward at its tip. In this embodiment, the claw 52 has a V-shape having tapered surfaces 52a and 52b on both sides.

Around the shaft 46, a torsion coil spring 4
8 is wound, one end of which is locked to the shaft portion 50 on the claw support member 42 side, and the other end is locked to the upper end of the claw member 44. Then, the resilient force of the torsion coil spring 48 and the weight of the claw member 44 urge the claw member 44 in the clockwise direction in FIG. 3B (the direction in which the claw 52 is directed downward). ing.

When a sufficient urging force can be obtained only by the weight of the claw member 44, the spring members such as the torsion coil spring 48 can be omitted.

A stopper 47 projects from an appropriate position of the claw support member 42, and the stopper 47 is attached to the shaft 4 of the claw member 44.
6 comes into contact with the vicinity of the lower part from below, so that the claw member 44 is formed.
Are held in a horizontal position as shown by a solid line in FIG. Then, at this horizontal position, the processed work W1 (FIG. 3) extruded from the processing position as described above.
The claw 52 is located between (b)) and the unprocessed work W2 that is newly set at the processing position in place of the processed work W1.
The height position of the claw 52 is set such that can be interrupted. In other words, the horizontal position is an interrupt position where the claw 52 can interrupt between the works W1 and W2.

As shown in FIG. 1, both hydraulic cylinders 32,
A hydraulic switching valve 54 is provided in a hydraulic circuit for driving the hydraulic pressure control valve 36. The hydraulic switching valve 54 is a three-position electromagnetic switching valve in the illustrated example, and has two primary ports and two secondary ports. The primary side port is connected to the hydraulic pump side and the tank side, respectively, and one secondary side port 57 is connected to the rod side chamber of both hydraulic cylinders 32 and 36.
The other secondary side port 58 is connected to the head side chambers of both hydraulic cylinders 32 and 36, respectively. The hydraulic switching valve 54 is provided with a position for guiding hydraulic oil fed from the hydraulic pump to the rod-side chambers of both hydraulic cylinders 32 (a lower position in the figure) and a neutral position for completely blocking the hydraulic oil (middle position in the figure). And a position (upper position in the drawing) for guiding the hydraulic oil to the head side chambers of both hydraulic cylinders 32.

Further, between the secondary port 58 and the head side chamber of the unloading hydraulic cylinder 36, a flow control valve 56 for adjusting the operating speed of the unloading hydraulic cylinder 36 is provided. In this embodiment, the operating oil flow rate in the flow control valve 56 is adjusted so that the claw 52 can reach the interrupt position before the unprocessed work W2 pushed by the pusher 34 reaches the processing position.

Next, the operation of this device will be described.

The inner surface grinding of the work W is performed in a state where the work W is held at a proper processing position as shown in FIG. More specifically, the work W is supported by both work support rollers 1.
The workpiece W is rotated clockwise as shown by the arrow in FIG. 1 while the workpiece W is rotated in the clockwise direction in FIG. In this direction, and in this state FIG.
The grindstone 29 is inserted into the inside of the work W through the through hole 27a of the front plate 27 shown in FIG. 1 and pressed against the inner circumferential surface of the work W, whereby the inner circumferential surface is ground. At this time, the hydraulic switching valve 54 is switched to the lower position in FIG. 1, both hydraulic cylinders 32 and 36 are held in a contracted state, and both the pusher 34 and the work carrying member 40 are retracted to the retracted position.

When the processing of the work W is completed and the work W becomes the processed work W1, the hydraulic switching valve 54 is switched to the upper position in FIG. 1, and the hydraulic oil is simultaneously supplied to the head side chambers of both the hydraulic cylinders 32 and 36. Is done. As a result, the pusher 34 moves forward to supply the unprocessed work W2 located at the replenishment position below the work storage tube 30 toward the processing position, and at the same time, the entire work unloading member 40 moves forward to unload the unprocessed work W2. The claw 52 reaches the interruption position before reaching the processing position (the state of FIG. 4).

In this embodiment, the interruption position is a position where the processed workpiece W1 at the processing position and the claw 52 are close to each other as shown in FIG. 4, and is supplied to the processing position. The position where the claw 52 and the processed work W1 are separated from each other is set so that the unprocessed work W2 does not contact the claw 52. The unprocessed work W2 pushed by the pusher 34 is supplied to the work position while pushing up the upper work support roller 24 against its own weight.

After the claw 52 reaches the interruption position, the unprocessed work W2 pushes the processed work W1 from the processing position to the side opposite to the shoe 28, and is set at the processing position instead of the processed work W1. . At this time, the processed work W1 first hits the front side (right side in FIG. 4) of the claw 52, and pushes up the claw 52 against its own weight and the urging force of the torsion coil spring 48 (FIG. 5). Under the claw 52, the rear tapered surface 5
2b (see FIG. 6). This allows
The claw 52 is a processed work W1 extruded from the processing position.
And an unprocessed work W1 newly set at the processing position.

Thereafter, the hydraulic switching valve 54 is switched to the lower position in FIG. 1 again, and the supply of the hydraulic oil to the rod-side chambers of both hydraulic cylinders 32 and 36 starts. As a result, the work unloading member 40 retreats, but at the start of the retraction, the claw 52 interrupts between the workpieces W1 and W2. To the discharge side (FIG. 7). Therefore, even if the processed work W1 is lightweight, the work W1 is reliably sent to the outshoot 18 and clogging due to a defective work unloading is prevented. That is, in this apparatus, it is possible to reliably carry out the processed work W1 with a simple configuration that only moves the work carrying member 40 forward and backward.

Next, a second embodiment will be described with reference to FIGS. In the first embodiment, the forward speed of the work unloading member 40 is set such that the claw 52 reaches the interrupt position before the unprocessed work W2 reaches the processing position. In the embodiment, as shown in FIG. 8, the forward speed of the work unloading member 40 is set so that the claw 52 reaches the interruption position after the unprocessed work W2 pushes the processed work W1 to reach the processing position. ing.

In this case, just before the claw 52 reaches the interruption position, the front tapered surface 52a of the claw 52 first comes into contact with the processed work W1, and thereafter, the claw 52 is pushed up against the urging force with the advance. (FIG. 9). In other words,
The claw 52 rides on the outer peripheral surface of the processed work W1. Then, when the lower end of the claw 52 gets over the central portion of the processed work W1, the claw 52 starts to interrupt (becomes lowering) between the works W1 and W2, and finally reaches the interruption position shown in FIG. . The interruption position may be a position where the front tapered surface 52a of the claw 52 is separated from the unprocessed work W2 as shown in the drawing, or the front and rear tapered surfaces 52a and 52b of the claw 52 are respectively formed by the unprocessed work W2 and the unprocessed work W2. It may be a position in contact with the finished work W1. In any case, after the interruption, the claw 52 draws in the processed work W1 as the work carrying-out member 40 retreats (see FIG. 7) and reliably sends the processed work W1 to the outshoot 18; As in the case of the embodiment, work clogging due to defective carry-out is prevented.

However, in the first embodiment, the claw 52 has already reached the interrupting position when the unprocessed work W2 reaches the processing position, so that the cycle time is shorter than in the second embodiment. This has the advantage of being shorter and increasing production efficiency.

In addition, the present invention can take the following forms as examples.

(1) In the above embodiments, the two hydraulic cylinders 32, 36 are connected to a common hydraulic source and are operated simultaneously. However, the work supply means and the unloading means may be individually controlled. Good. Also, the working fluid is not limited to oil,
For example, air may be used.

(2) In each of the above-described embodiments, the work carrying-out member 40 is advanced at the end of machining to bring the claw 52 to the interrupting position. The workpiece carrying member 40 is retracted after the machining is completed and the unprocessed workpiece W2 is supplied to the machining position (that is, after the interruption of the claw 52 between the workpieces W1 and W2 is completed). You may make it do. In this case, it is preferable that the interruption position is set at a position where the claw 52 is separated from the workpiece during processing as described in the first embodiment.

(3) In the above embodiment, only the flow control valve for controlling the forward speed of the unloading hydraulic cylinder 36 is provided, but only the flow control valve for controlling the forward speed of the supply hydraulic cylinder 32 is provided. Or both hydraulic cylinders 36,
For each of the 32, a flow control valve for controlling the forward speed may be provided. The hydraulic cylinders 36, 32
It is also possible to omit the flow control valve for both.

(4) In the above embodiment, the claw member 44 is rotatably attached to the claw support member 42. However, the claw member 44 may be attached to the claw support member 42 so that the entire claw member 44 can be moved up and down. As described above, the claw 52 can be retracted upward from the interruption position.

(5) In the above embodiment, the internal grinding machine is shown. However, for example, at least one of the surface grinding machine for processing the end face (the left side face in FIG. 2) of the work W and the work supporting roller is constituted by a grindstone. The present invention is also applicable to a cylindrical grinder or the like configured to grind a work outer peripheral surface.

[0043]

As described above, according to the present invention, in a grinding machine for holding a work at a working position by upper and lower work supporting rollers and shoes, the unworked work at the above working position and the unprocessed work are extruded. A claw member having a downward claw that can be interrupted between the workpiece and a processed workpiece; a claw support member that movably supports the claw member; and a claw transfer unit that transfers the claw member back and forth. Is configured to retreat the claw support member from the interrupting position, so that the claw forcibly discharges the processed work. Therefore, the claw member and the claw support member need only be transported back and forth. With a simple configuration, it is possible to reliably carry out the processed work pushed out of the processing position by the unprocessed work, and it is possible to prevent work clogging due to poor carry-out.

Here, there is provided transfer control means for controlling the operation of the claw transfer means so that the claw reaches the interruption position before the unprocessed work reaches the processing position. If the shape of the claw is set so that the processed work pushed out from the processing position pushes the claw at the interruption position and passes below the claw, the claw is moved to the interruption position after the unprocessed work reaches the processing position. The cycle time can be shortened and the production efficiency can be further increased as compared with the case of

The work supply means includes a supply fluid pressure cylinder for pushing an unprocessed work to a processing position, and the claw transfer means includes a carry-out fluid pressure cylinder for moving the claw support member forward and backward. A transfer control means for controlling the operation of the transfer means is provided with a switching valve for simultaneously switching the supply and discharge of the working fluid to and from the two hydraulic cylinders to simultaneously perform the supply operation of the unprocessed work and the advance operation of the claw support member. With such a configuration, the operation of the work supply unit and the operation of the work unloading unit can be reliably synchronized with a simple configuration using only a single switching valve.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an internal grinding machine according to a first embodiment of the present invention.

FIG. 2 is a sectional side view showing a processing position of the internal grinding machine.

FIG. 3A is a plan view of a work carrying-out member provided on the internal grinding machine, and FIG. 3B is a front view thereof.

FIG. 4 is a front view showing a state where the claws of the work carrying member have reached an interruption position.

FIG. 5 is a front view showing a state in which the claw at the interruption position is pushed up by a processed work pushed out from the processing position.

FIG. 6 is a front view showing a state in which the interruption of the claw between the processed work and the unprocessed work is completed.

FIG. 7 is a front view showing a state in which the claw is forcibly discharging the processed work with the retreat of the work carrying member.

FIG. 8 is a front view showing a state immediately after an unprocessed work reaches a processing position in a second embodiment of the present invention.

FIG. 9 is a front view showing a state in which a claw heading to an interruption position is riding on a processed workpiece in the second embodiment of the present invention.

FIG. 10 is a front view showing a state where the claw has reached an interruption position in the second embodiment of the present invention.

FIG. 11 is a front view showing a main part of a conventional centerless grinding type grinding machine.

[Explanation of symbols]

 16 Lower work support roller 24 Upper work support roller 28 Shoe 32 Supply hydraulic cylinder 34 Pusher 36 Unloading hydraulic cylinder 40 Work unloading member 42 Claw support member 44 Claw member 48 Torsion coil spring 52 Claw 54 Hydraulic switching valve W Work W1 Processing Finished work W2 Unworked work

Claims (4)

[Claims] 1. A work supporting roller for supporting a work from above and below, a shoe for supporting the work from a side, and an unprocessed work being supplied from the same side as the shoe to a processing position between the work supporting rollers. A grinding machine configured to include a work supply means, and after the work processing is completed, the unprocessed work supplied by the work supply means pushes out the processed work at the processing position and is newly set at the processing position. A claw member having a downward claw that can be interrupted between the unprocessed work at the processing position and the processed work extruded by the unprocessed work; The claw member is movable between an interruption position where the interruption between the workpiece and the processed work is possible and a retracted position above the interruption position, and the claw member is provided with the above-mentioned splitting member. A claw support member for supporting the claw support member in a state of being biased to the retracted position side, and a reciprocating position between the advancing position at which the claw reaches the interruption position and the retreat position farther from the shoe than the advancing position. A grinding machine characterized by comprising a claw transfer means for causing the claw support member to retreat from a state where the claw is at the interruption position, whereby the claw draws in the processed work toward the discharge side. Work unloading device. 2. The apparatus according to claim 1, wherein the operation of the claw transfer means is controlled so that the claw reaches the interrupt position before the unprocessed work reaches the processing position. Transfer control means,
A work unloading device for a grinding machine, wherein the shape of the claw is set such that a processed work pushed out from the processing position by the unprocessed work pushes up the claw at the interruption position and passes below the claw. 3. The work unloading device for a grinding machine according to claim 1, wherein the operation of the claw transfer means is controlled so that the claw reaches the interruption position after the unprocessed work reaches the processing position. Equipped with transfer control means,
A work unloading device in a grinding machine, wherein a shape of the claw is set so that the claw rides on the processed work and reaches the interruption position. 4. The work unloading device in a grinding machine according to claim 2, wherein the work supply means includes:
A hydraulic fluid cylinder for feeding the unprocessed work to the processing position; a hydraulic fluid cylinder for carrying out the claw support member as the claw transport means; and a hydraulic fluid for the hydraulic cylinders as the transport control means. A work unloading device for a grinding machine, comprising a switching valve for simultaneously switching the supply and discharge of the workpiece and performing a supply operation of the unprocessed work and an advance operation of the claw support member at the same time.