JPH0730264Y2 - Backstep device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a backstep device for advancing and retracting a processing device for processing a plurality of positions on a same axis of a work.

(Prior Art) Conventionally, as a back step device for advancing and retracting a processing device for processing a plurality of positions on the same axis of a work,
For example, when processing the valve seat and valve guide of the cylinder with the cutting blade and reamer provided on the cutting tool head, apply high pressure to the cylinder that moves the slide base with the cutting tool head forward and backward, and bend the slide base to the stopper piece. Move the blade head forward, rotate the blade head at a low speed, process the seat surface of the valve seat with the cutting blade to the desired amount, and then apply low pressure to the cylinder to return the bent stopper piece to the original position and slide it. The base moves backward a minute distance so that the cutting edge of the cutting tool head moves away from the seat surface of the valve seat by a small distance, and the cutting tool head is rotated at high speed to move forward while rotating the reamer to machine the inner diameter of the valve guide. is there.

(Problems to be solved by the invention) However, in the above-described backstep device, since the blade head is retracted by utilizing the bending of the stopper piece, the stopper piece returns to the original position while repeating the forward / backward movement. The cutting edge of the cutting tool head does not retreat to a position away from the seat surface of the valve seat, and the cutting tool head may rotate at high speed to process the inner diameter of the valve guide without retreating, which may damage the valve seat. .

(Means for Solving the Problems) In order to solve the above problems, according to the present invention, a cylinder having piston rods at both ends is disposed behind a slide base on which a processing device is mounted, and one piston rod of the cylinder is slidable. It was mounted on a base, a stopper was attached to the rear end of the other piston rod, and a backup cylinder was installed between the cylinder and the stopper to retract the other piston rod by a minute distance.

(Operation) After the cylinder is operated and the slide base is moved forward for the first machining, the backup cylinder is operated and the piston rod of the cylinder is retracted by a minute distance, so that the slide base is retracted and the machining device is operated for the first time. A small distance from the machining position.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of a back step device according to the present invention, FIG. 2 is a plan sectional view of the back step device, and FIG. 3 is a side view of the device.

A cutting tool head 1 which is a processing device includes a cutting blade 2 and a reamer 3, and is mounted on a slide base 5 of a back step device 4.

A cylinder 7 mounted on a substrate 6 is disposed behind the slide base 5, and the cylinder 7 has a piston 8 slidably fitted therein and piston rods 9 and 10 provided integrally with the piston 8. Is attached to the slide base 5, and a stopper ring 11 is attached to the rear end of the piston rod 10.

Further, a backup cylinder 12 attached to the substrate 6 is arranged on the piston rod 10 side of the cylinder 7. This backup cylinder 12 has a holder 13 composed of a plurality of members.
A sliding member 15 which can move back and forth by a gap of 14 is fitted between the inner peripheral surface and the outer peripheral surface of the piston rod 10.
A sub-sliding member 17, which is slidable by a gap of 16 minutes, is fitted between the outer peripheral surface and the inner peripheral surface of the holder 13.
18 is stuck. The sum of the surface areas of the sliding member 15 and the sub-sliding member 17 is made larger than the surface area of the piston 8 of the cylinder 7, so that the sliding member 15 and the sub-sliding member 17 are operated during the operation of the piston 8.
To be able to move a minute distance.

Then, the moving member 20 is fixed to the rear end of the sliding member 15,
A guide bar 22 slidably fitted in a guide member 21 attached to the substrate 6 is integrally provided on the holder 13 side of the moving member 20, and a stopper piece that can abut the stopper piece 18 of the holder 13. 23 is stuck.

Further, at the rear end of the moving member 20, a motor 25
A rotatable main gear 26 that is driven to rotate by 25, and two rotatable driven gears 27, 2 that mesh with the main gear 26.
7 are provided, and four stoppers having different heights that can contact the stopper ring 11 of the pistol rod 10 are provided around the driven gears 27, 27.
28, 29, 30, 31 are attached, respectively, and a support member 32 for preventing the driven gear 27 from bending is attached to the rear end of the moving member 20.

The operation of the backstep device configured as described above will be described below.

First, when the work W, which is a cylinder head, is positioned in front of the slide base 5, hydraulic oil is injected into A of the cylinder 7 and the piston 8 is slid to move the slide base 5 at a high speed as shown by an arrow A in FIG. When the cutting blade 2 of the cutting tool head 1 comes in front of the valve seat S, the slide base 5 is advanced at a low speed to machine the seat surface of the valve seat S.

And the stopper ring 11 of the piston rod 10 is the stopper piece.
After the valve seat S has been processed by the cutting blade 2 to the position where it abuts against the 28, the port of the backup cylinder 12 is kept in a state where the hydraulic oil is still injected into the port A of the cylinder 7.
By injecting hydraulic oil into C and D, the sliding member 15 and the sub-sliding member 17 are indicated by arrows B in FIG. 2 by the gaps 14 and 16 (about 1 mm).
The moving member 20 moves in the same direction.

This movement of the moving member 20 causes the stopper piece 23 to move to the holder 13
While being separated from the stopper piece 18, a gap is formed in the same amount as the movement amount of the sliding member 10, and the driven gear 27 and the like move.

As a result, the stopper ring 11 of the piston rod 10 that is in contact with the stopper piece 28 of the driven gear 27 is pushed, so that the piston rod 11 moves a minute distance in the direction of arrow B in FIG.
Since it retreats, the slide base 5 retreats along with the cutting tool head 1, and the cutting blade 2 of the cutting tool head 1 retreats a little (about 1 mm) from the valve seat S of the work W and leaves.

Then, the cutting tool head 1 rotates at a higher speed, and then the reamer 3 projects from the inside of the cutting tool head 1 to process the inner diameter of the valve guide G of the work W.

Since the distance between the valve seat S and the valve guide G is different depending on the model, the motor 25 is driven to rotate the driven gear 27 via the main driving gear 26 so that the stopper ring 11 can be brought into contact with the stopper ring 11. By switching between 28, 29, 30, and 31, it is possible to deal with model changes. If such a function is not provided, the sliding member 15 may be provided with the stopper piece 28.

(Effect) As described above, according to the present invention, a cylinder having piston rods at both ends is provided behind a slide base on which a processing device is mounted, and one piston rod of this cylinder is mounted on the slide base. , A stopper is attached to the rear end of the other piston rod, and a backup cylinder is provided for retracting the other piston rod by a minute distance. By operating the backup cylinder, the slide base is retracted by a minute distance. Therefore, the processing device can be reliably retracted, and the next processing is not performed without the processing device retracting.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a back step device according to the present invention, FIG. 2 is a plan sectional view of the back step device, and FIG. 3 is a side view of the device. In the drawings, 1 is a cutting tool head, 2 is a cutting edge, 3 is a reamer,
4 is a back step device, 5 is a slide base, 7 is a cylinder, 9 and 10 are piston rods, 11 is a stopper ring, 12 is a backup cylinder, 13 is a holder, 15 is a sliding member, 16
Is a sub-sliding member, 20 is a moving member, 27 is a driven gear, 28, 29, 3
0 and 31 are stopper pieces.

Claims (1)

[Scope of utility model registration request] 1. A back step device for advancing and retracting a processing device for processing a plurality of locations on the same axis of a work, wherein a cylinder having piston rods at both ends is arranged behind a slide base on which the processing device is mounted. One piston rod of this cylinder is attached to the slide base, a stopper is attached to the rear end of the other piston rod, and the distance between the cylinder and the stopper is only a minute distance to the other piston rod. A back step device having a backup cylinder for moving in the backward direction.