JPH0632261Y2 - Steady structure of round material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a steady rest structure of a round material suitable for fast and stable steady rest clamping of a round material having a variable diameter within a certain range.

[Prior Art] In order to prevent steadying of relatively slender round material, steadying means for clamping an intermediate portion thereof is used. The steady rest preferably compensates for the free deflection of the middle part and acts to horizontally support the round bar. Therefore, if the round middle portion is deformed more than necessary and is sandwiched, the result is that the deflection of the work is promoted. In the prior art, a means for manually adjusting the workrest part and clamping the steady rest each time the diameter of the round material changes has been adopted.

[Problems to be Solved by the Invention] When the position of the workrest member is adjusted by means of a change in the diameter of the round material as in the prior art, it takes time for the adjustment work, and highly accurate positioning cannot be performed. There arises a problem that the steady rest mechanism cannot be fully exhibited.

The present invention solves the above problems and the like, and even if the diameter of the round material changes, it can automatically and reliably and easily support the steady rest of the work, and can always hold the round material at a substantially constant pressure. An object is to provide a steady rest structure for a round material.

[Means for Solving the Problems] In order to achieve the above object, the present invention mounts a round material on a V groove of a work rest member and presses the round material toward the work rest member side to fix the round material. In the stop structure,
A sleeve that fixes the workrest member to the upper end and is slidably supported on the immovable side of the device in the vertical direction;
An air supply path formed on the immovable side of the device to connect the inside of the sleeve and an air source, a clamping sleeve that abuts and engages with the outer circumference of the sleeve and expands and contracts the inner diameter thereof, and on the sleeve side. A dog that is fixed and whose fixed position is adjusted in the vertical direction, a limit switch that engages with the dog, and a tip end that abuts and engages with the outer circumference of the round material, and is rotatably supported on the fixed side of the device. The present invention is to provide a steady rest structure of a round material provided with a clamp member.

[Operation] The work rest member holds the round material at a constant pressure irrespective of the diameter change of the round material by the air having a constant pressure applied to the work rest member, and the clamp sleeve and the clamp for engaging the work rest member and the outer circumference of the round material. The round member is securely clamped by the member. Further, the round material is fixedly held at a predetermined position, and the clamp member uniformly presses the round material toward the work rest member side regardless of the diameter of the round material.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in the figure, the work rest member 1 includes a work rest portion 2 having a V groove and a sleeve 3 having one end fixed to the work rest portion 2.
Formed from. The V groove of the work strike part 2 supports the round members 4, 4A and the like. The sleeve 3 is slidably supported by inserting the other end side into a cylinder 5 formed on the stationary side of the steady rest. A clamping sleeve 6 for clamping the sleeve 3 is provided between the outer circumference of the sleeve 3 and the stationary side. The clamping sleeve 6 forms an air source portion 7 within its wall thickness. Further, a supply port 8 to which a hydraulic pressure is supplied from a hydraulic pressure source (not shown) communicates with the outer circumference of the clamping sleeve 6. The inner surface of the clamping sleeve 6 contracts and deforms, and the sleeve 3 is clamped.
A hollow portion is formed on the inner surface side of the sleeve 3, and an air supply port 9 that communicates with an air source communicates with the hollow portion. Further, springs 10 and 11 are inserted in the hollow portion to urge the sleeve 3 to press it toward the round material 4. The rod 12 connected to the sleeve 3 is for guiding the spring 11 and the like.

The sleeve 3 slides in the cylinder 5 by an aerodynamic force of a constant pressure from the air supply port 9, and abuts and engages with the round material 4. That is, the sleeve 3 and the work rest portion 2 are supported by a constant air pressure and springs 10 and 11, and are fixed by the clamp sleeve 6 at appropriate positions. The springs 10 and 11 elastically support the sleeve 3 in a state where the sleeve 3 is lowered to the lower side in the figure. When the sleeve 3 moves to the upper side in the figure, the spring 3 is not elastically supported and the sleeve 3 does not move. Only supported by air pressure. Therefore, the round material 4 placed on the work rest portion 2 is supported by a constant air pressure.

The clamp member 13 is formed in a lever shape, and the abutting portion 14 on one end side thereof is arranged at a position which substantially abuts the work rest portion 2 at a position where it abuts and engages with the outer circumference of the round material 4. Further, the pinion 15 pivotally supported on the other end side of the clamp member 13 on the stationary side and fixed on the rotation shaft thereof meshes with the rack 16A of the rack rod 16. A pressure cylinder (hydraulic pressure) 17 is connected to the rack rod 16. Therefore, the pressure cylinder 17
By this operation, the clamp member 13 swings via the rack machine 16 and the pinio 15, and the abutting portion 14 is brought to a position where it comes into contact with the round material 4. The round material 4 is sandwiched and fixed between the work rest member 1, the work rest portion 2 and the contact portion 14 of the clamp member 13, and the work rest portion 2 is provided with a plate member 18 along the axial direction of the sleeve 3 and a dog. The shaft 19 for is installed in parallel.
A dog 20 is screwed onto the dog shaft 19. The dog 20 abuts and engages with the limit switches 21 and 22, respectively.

Next, the operation of this embodiment will be described.

When the round bar 4 is supported between a headstock and a tail center (not shown), a constant pressure of air from an air pressure source (not shown) is supplied from the air supply port 9 into the hollow portion of the sleeve 3,
The sleeve 3 moves upward in the drawing, the V groove of the work rest 2 contacts the round member 4, and the round member 4 is supported at a desired position. Here, pressure oil pressure is supplied from the supply port 8 to the outer peripheral side of the clamping sleeve 6, the sleeve 3 is fixed at the position, and at the same time, the pressure cylinder 17 is interlocked, the clamp member 13 is swung, and the contact portion 14 is moved. Contacts the outer circumference of the round material 4. As a result, the round material 4 is securely fixed at the predetermined position. On the other hand, in order to separate the contact portion 14 from the round material 4, the air inside the sleeve 3 is depressurized and at the same time the hydraulic pressure outside the clamping sleeve 6 is depressurized to lower the sleeve 3. Further, the pressure cylinder 17 operates, and the pinion 15 that meshes with the rack 16A.
The clamp member 1 is rotated by rotating it clockwise.
Rotate 3 to perform.

Since all the above operations are automatically performed, a steady rest clamp can be performed, and the round material 4 is supported at a substantially constant pressure by the air having a constant pressure.

The same applies to the round material 4 and the irregularly shaped round material 4A. Similarly to the above description, the round member 4A is also supported by the steady rest clamp at a substantially constant pressure.

When the diameter changes as in the round members 4 and 4A, the work rest member 2 and the sleeve 3 are in a constant rising position, and when the rotating position of the tip of the clamp member 13 is constant, the round members 4 and 4a and the clamp member are fixed. A difference occurs in the contact state with 13. Therefore, there arises a problem that both the round members 4 and 4A are not uniformly pressed by the work rest member 2. Therefore, in this embodiment, the operating position of the clamping sleeve 6 is set to the round members 4 and 4.
It changes according to the diameter of A. Limit switch 2
By changing the positions of the dogs 1, 22 and the dog 20 engaged therewith, the operation position can be easily changed. As described above, the round members 4 and 4A are securely held regardless of the change in the diameter of the round members 4 and 4A.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the variable-diameter round material is automatically and reliably and easily steady-clamped at a constant pressure and the same-diameter round material is secured at a fixed position. The effect that can be supported by the steady rest is enhanced.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing the overall structure of an embodiment of the present invention. 1 ... Work rest member, 2 ... Work rest part, 3 ...
... Sleeve, 4, 4A ... Round material, 5 ... Cylinder, 6 ...
… Clamping sleeve, 7 …… Sky source, 8 …… Supply port,
9 ... Air supply port, 10, 11 ... Spring, 12 ...
... Rod, 13 ... Clamping member, 14 ... Abutting part, 1
5 ... Pinion, 16 ... Rack rod, 16A ... Rack, 17 ... Pressure cylinder, 18 ... Plate member, 19 ...
Shafts for dogs, 20 ... Dogs, 21, 22 ... Limit switches.

Claims (1)

[Scope of utility model registration request] 1. A round member is placed on the V groove of a work rest member,
In a steady rest structure of a round member that presses and fixes the round member to the workrest member side, a sleeve that fixes the workrest member to an upper end portion and is slidably supported on the immovable side of the device along the vertical direction. An air supply path formed on the stationary side of the device to connect the interior of the sleeve with an air source;
A clamping sleeve that abuts and engages with the outer circumference of the sleeve and expands and contracts the inner diameter thereof, a dog that is fixed to the sleeve side and whose fixing position is adjusted in the vertical direction, and a limit switch that engages with the dog. A steady rest structure of a round member, wherein a tip end of the round member is brought into contact with and engaged with the outer periphery of the round member, and a clamp member is rotatably supported on a fixed side of the apparatus.