JPS605405B2 - Jig for supporting thin-walled hollow cylindrical workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support jig for a thin-walled hollow cylindrical workpiece, and its purpose is to facilitate attachment and detachment to the workpiece and to prevent chatter marks caused by microvibration of the workpiece during machining. It is an object of the present invention to provide a pick-up tool that supports a workpiece to increase its rigidity in order to prevent this.

When cutting or grinding the outer peripheral surface of a long, thin-walled cylindrical workpiece using a machine tool, chatter marks occur due to the vibration phenomenon due to insufficient rigidity of the workpiece.

In order to prevent this chatter mark, methods have been adopted such as sealing a filler inside the workpiece or inserting a collet type jig to support the inner peripheral surface of the workpiece. However, the method of sealing the filler itself is troublesome and is not preferable in terms of work efficiency. In addition, although the collet method for odor pickup can be used for simple cylindrical workpieces with wide openings at both ends, for example, ink kneading, spreading, etc. used in high-speed automatic rotary printing machines, In the case of a workpiece such as a roller, which is a thin cylinder and has small diameter holes on both end faces, it is difficult to attach and remove it from the workpiece, and it cannot be used.
In addition, the collet expands uniformly in all directions around the circumferential surface of the workpiece, so if the circumferential surface of the cylinder is rough-machined and has an uneven surface and is thin, the collet's expanding force may partially distort the workpiece. ,
If the collet is shrunk after machining the outer circumferential surface, the distorted portion will be restored, resulting in a problem that the machining accuracy of the outer circumferential surface cannot be obtained evenly. The present invention solves the above-mentioned conventional problems and provides a supporting waste with a simple structure and easy attachment/detachment operation.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a thin-walled, hollow cylindrical workpiece (hereinafter simply referred to as the workpiece), and both end faces of the workpiece are so-called bag-shaped and have small openings □2. 3 is workpiece 1
4 is a support tube that constitutes this jig 3, and 5 is a plurality of contacts arranged radially on the support tube 4, which are attached to the inner peripheral surface of the workpiece 1. come into contact with

6 is a pair of link mechanisms that pivotally support the contactor 5 and contract and expand in the light direction; 7 is a gripping member that securely supports both ends of the support cylinder 4 on the closed openings 2 at both ends of the workpiece 1; 8 is a vertical link mechanism; Attachment member, 9
is Senyu. The configuration will be explained in more detail with reference to FIGS. 2 to 5.

The support tube 4 extends vertically through the workpiece 1 in the direction of the marking line. Long holes 1 in the axial direction are formed in one or more places in this support tube 4.
0 is opened radially. Then, a pair of links 6 are set in which each of the elongated holes 10' bends and extends independently. A pivot pin 11 is provided at the connection point of one end of the pair of links 6.
A contact 5 having a surface parallel to the inner circumferential surface of the workpiece 1 by
is supported. Furthermore, a notch 21 is formed in the pair of links 6 to receive the contactor 5 .
Further, a roller 2 is rotatably supported at each end of the pair of links 6. A resilient member, for example, an endless coil spring 20 as clearly illustrated in FIG. It's stopped. On the other hand, a regulating member 16 is fixed within the support tube 4 by a pin 17, and a roller 12 at one end of the pair of links 6 is in contact with a regulating portion 18 formed on the regulating member 16.

Further, an actuating rod 13 is inserted and supported in the axial direction within the support cylinder 4 so as to be movable back and forth. At the tip of the actuating rod 13, a twilling portion 15 facing and abutting the regulating portion 18;
It has a support rod 14 that is in contact with the roller 2 at the other end of the pair of links 6. Further, a pushing member 22 is supported on the support rod 14. This pushing member 22 includes a plunger 24 that is parallel to the axis of the actuating rod 13 and supports each roller 12 at the other end of the pair of links 6, and a plunger 24 that is provided with an elastic force. A spring 25 that can move forward and backward, and a support ring 23 that supports the spring 25 are provided. Reference numeral 19 denotes a spring interposed between the end face of the regulating portion 18 and the end face of the support rod 14, which always urges the actuating rod 13 in the backward direction.

A support member 27 that slidably supports the rear end of the operating rod 13 is screwed into both ends of the support cylinder 4, and a torque wrench hole 28 is provided in the outer end of the support member 27. An adjusting screw shaft 26 for pushing the actuating rod 13 forward is screwed therein.

Further, a center hole 32 is provided on the outer peripheral surface of the support member 27. The above-described gripping members 7 are iron-mounted on the outer surfaces of both ends of the support tube 4, and both ends of the support tube 4 are supported by the gripping members 7 so as to be slidable only in the axial direction.

The tightening member 8 is screwed into screws carved on the outer surface of both ends of the support tube 4, and the gripping member 7 is pressed against the openings 2 on both end surfaces of the workpiece 1 to attach the support tube 4 to the workpiece 1. It is fixed against the Reference numeral 29 denotes a notch groove provided in the flange of the gripping member 7, and a drive member 30 protruding from the main shaft 31.
engages with this and transmits the rotation of the main shaft 31 to the workpiece 1.

Next, a description will be given of the operation of attaching and detaching the sling of the present invention having the above-mentioned configuration to and from the workpiece 1.

When the jig 3 is inserted into and removed from the workpiece 1, all the links 6 are contracted in the direction of the axis 0 of the support cylinder 4, as shown in FIG. That is, the actuating rod 13 has moved to the retracting machine, and along with this, the pushing portion village 22 has also moved backward together. Therefore, the link 6 is forcibly drawn toward the support tube 4 by the contraction force of the coil spring 201, and the pantograph is in the same state as when it is folded. The contact 5 is connected to a notch 21 provided in the link 6.
It is housed inside and the external dimensions are kept as short as possible. Therefore, the jig 3 can be easily taken in and out from the small openings 2 on both end faces of the workpiece 1. By inserting the support cylinder 4 into the workpiece 1 and attaching the gripping members 7 at both ends with the cotton-attached members 8, the gripping members 7 are engaged and fixed to the closing opening 2, and the jig 3 is set inside the workpiece 1. Ru.

Thereafter, the adjusting screw shaft 26 is rotated using a torque wrench to move the operating rod 13 forward. As the actuating rod 13 moves forward, the pushing member 22 also moves forward, and the plunger 24 presses against the roller 2 at the other end of the link 6. As a result, the roller 12 at one end of the link 6 comes into contact with the regulating member 16 and is restricted from moving, so the pair of links 6 resists the contractile force of the coil spring 20 and swings against the pivot pin 11'. It is bent using the connection point as a fulcrum, and the contactor 5 is expanded outward. The actuating rod 13 is activated when the end face of the rear portion 15 at the tip of the actuating rod 13 hits the end face of the regulating portion 18.
This is the forward movement end position, and the contactor 5 is fully expanded as shown in FIG.
The inner circumferential surface of is supported at a radial position. A spring 19, which blocks the forward movement of the actuating rod 13 and is inserted between the restricting portion 18 and the support rod 14, is compressed and applies a reaction force in the backward direction to the actuating rod 13. The contact point between the adjusting screw shaft 26 and the adjusting screw shaft 26 is always kept in contact with each other. The actuating rod 13 and the adjusting screw shaft 26 may not be separated as shown in the figure, but may be integrally connected. In this case, the spring 19 becomes unnecessary. Of course, even if the actuating rod 13 and the adjusting screw shaft 26 are separated, the spring 19 can be omitted if the coil spring 20 has a small contraction force. The contact 5
When in contact with the inner circumferential surface of the workpiece 1, the inner circumferential surface of the workpiece 1 is not necessarily a smooth surface, and in the case of casting, it is often a rough, uneven surface.

If one or more of the contacts 5 comes into contact with a convex surface, each link 6 independently absorbs the convex surface contact and all provide contact support with substantially equal counterforce. That is, each link 6 is individually pushed forcefully by the plunger 24 to expand the contactor 5. Therefore, if there is a contact 5 in contact with the convex surface, the expansion action of that contact 5 is stopped, and the plunger 24 compresses the spring 25 and retreats to allow the forward movement of the actuating rod 13, and the other The bush toucher 5 is expanded until it touches the inner peripheral surface of the workpiece 1. The removal operation of the vulgar odor 3 is easily performed in the reverse order of the insertion operation. As described above, the pick-up device of the present invention can be easily attached and detached even if the openings at both ends of the workpiece are small, and the contactor is supported in contact with the inner peripheral surface of the workpiece by the link mechanism that bends and extends in a so-called pantograph manner. This increases the rigidity of thin-walled cylindrical workpieces and prevents chatter marks from forming during machining.

Furthermore, ``the contacts are moved individually toward the inner circumferential surface of the workpiece by a link mechanism that blocks elastic pressure from the plunger, so even if there is a convex surface on the inner circumferential surface of the workpiece, they are all moved equally. Since the contact and supporting pressure are all equally obtained, there is no local distortion of the workpiece, and it has the advantage of being able to process the outer circumferential surface with high accuracy.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the jig according to the present invention mounted on a workpiece and supported, Fig. 2 is a sectional view of the main part of Fig. 1, and Fig.
The figure is a sectional view showing the state in which support for the inner peripheral surface of the workpiece is released in Fig. 2, Fig. 4 is a sectional view taken along the line N-W in Fig. 2, and Fig. 5 is a sectional view of the
It is a sectional view taken along the line V-V in FIG. DESCRIPTION OF SYMBOLS 1... Thin hollow cylindrical workpiece, 2... Open □, 3... Support pick-up, 4... Support tube, 5... Contact, 6...
Link, 7... Gripping member, 8... Cotton attachment member, 10...
Long hole, 11... Pivot pin, 12... Roller, 13.
... Operating rod, 14... Support rod, 15... Supporting part, 16... Regulation member, 20... Coil spring,
21... Notch portion, 22... Pushing member, 24... Plunger,
25...Spring, 26...Adjustment screw, 27...
・Supporting member. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. Both ends of a support tube that passes through the cylinder of a thin-walled hollow cylindrical workpiece in the axial direction are fixedly supported concentrically with the workpiece by gripping members attached to the end surface of the workpiece, and a plurality of Elongated holes are opened radially, and a pair of independently bendable link mechanisms is arranged radially in each elongated hole of the support tube, and a link mechanism is provided at the connecting part of the pair of link mechanisms on the inner circumferential surface of the workpiece. An elastic member is provided for pivoting the contacts that come into contact and applying a contraction force in the axial direction of the support tube to each of these link mechanisms, and a regulating member that supports one end of each of the link mechanisms is provided within the support tube. Further, an operating rod supporting the other end of each link mechanism is provided in the support cylinder so as to be movable in the axial direction, and each link mechanism is extended between the operating rod and the other end of each link mechanism. a thin-walled hollow cylinder, comprising a pressing member that elastically presses independently of each other in the direction of movement, and an adjustment portion that moves the actuating rod back and forth in order to expand and contract each link mechanism via these pressing members. Jig for supporting shaped workpieces.