JPH0337854Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a jig for machining a cylindrical workpiece.

[Conventional technology]

Conventionally, when machining a cylindrical workpiece with an NC lathe, etc., the main spindle side is pushed out from the inside of the workpiece by a collect chuck, and the other side is fixed by the center of the tailstock to perform parting and chamfering of the inner and outer diameters. I was doing it.

[Problem that the invention attempts to solve]

However, in the above conventional technology, when it is desired to machine both ends of a cylindrical workpiece, for example, one side (tailstock side) is first machined, and in order to machine the other side (chuck side), the tailstock is moved away from the cylindrical workpiece. It was necessary to invert the cylindrical workpiece, hold the machined end face in a collection chuck, press it with a tailstock, and then perform processing such as cutting off. In this way, it took a lot of time to prepare for installation and removal each time, resulting in poor work efficiency. Furthermore, since the collet is held only by the collet chuck, when the collet is unclamped and released, there is a problem that the collet bites into the workpiece and is difficult to release. There was also the problem that long workpieces were unstable and the types of workpieces that could be used were limited.

The present invention was proposed in view of the above circumstances, and it is possible to machine both ends of a cylindrical workpiece, regardless of its length, without resetting the workpiece or changing setups, using a simple device. To provide a highly productive jig for machining a cylindrical workpiece, which can forcibly clamp and unclamp a collet to a workpiece, thereby improving work efficiency and shortening work time.

[Means for solving problems]

The jig for machining cylindrical workpieces of this invention includes an arbor having two tapered parts, each end of which is supported by a center on the spindle side and a center on the tailstock side, and an arbor at one end of the arbor. a rotation transmitting member attached to the tip of the main shaft and fixed to the axis of the arbor in order to transmit the rotation of the main shaft to the arbor; A first collet that holds the inner diameter of the workpiece is screwed onto one end of the arbor, and is engaged with a groove of the first collet.
a first sleeve movable in the axial direction together with the collet; and a second collet provided on the other tapered part of the arbor and having a groove around the diameter and expanding in the radial direction to hold the inner diameter of the workpiece. , a second sleeve provided at the other end of the arbor and capable of engaging with a groove of the second collet and movable in the axial direction together with the second collet; The second sleeve is moved in the axial direction by relative movement between the spindle side center and the tailstock side center to push and pull the second collet. The structure is such that the inner diameter of the workpiece is clamped and unclamped.

[Effect]

Attach first and second holding members to both ends of the arbor,
The cylindrical workpiece is inserted into the cylindrical workpiece, the inner diameter of the cylindrical workpiece is held by the first holding member, and the workpiece is fixed by the spindle side center and the tailstock side center. By pressing from both ends, the second holding member also expands in the radial direction and holds the inner diameter of the cylindrical workpiece. Thereafter, by rotating the main shaft, the cylindrical workpiece is rotated via the rotation transmission member, and predetermined machining is sequentially performed using a tool such as a parting tool.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in more detail based on the drawings.

Fig. 1 shows the jig for machining a cylindrical workpiece according to the present invention, Fig. 1A shows an entire side sectional view, Fig. 1B shows a - arrow view in Fig. 1A, and Fig. 1C shows a jig for machining a cylindrical workpiece according to the present invention. A - arrow view in A is shown.

In FIGS. 1A to 1C, an arbor 1 having outwardly conical bulges 1a and 1b at both ends is inserted into a cylindrical workpiece 100. As shown in FIGS. The arbor 1 has conical bulges 1a and 1b at both ends,
One end extends as a small diameter shaft 1c having a threaded portion, and the other end simply extends as a small diameter shaft 1d.

A stationary sleeve 2, which is a first holding member and has an engagement groove 2a to engage with the collet, is attached to the small diameter shaft 1c having the threaded part, and a part of the fixed sleeve 2 is threaded into the threaded part, and the tip is connected to the main shaft. The arbor 1 is inserted toward the side up to the vicinity of the driver 13, and the arbor 1 is tightened to the right in the figure by turning the spanner hook N with a spanner or the like, as shown in FIG. 1B.

A floating sleeve 3, which is a second holding member having an engagement groove for engagement with the collet, is fitted into the small diameter shaft 1d at the other end. The inner diameter of the sleeve 3 forms a stepped through hole 3a, and a washer 5 attached to the tip of the small diameter shaft 1d at the end of the arbor 1 with a bolt 4 is abutted against the stepped portion to open the floating sleeve 3.
prevents it from coming off.

The fixed sleeve 2 and the floating sleeve 3 each have a flange-shaped bulge extending from the narrow diameter portions at both ends of the arbor 1 toward the center of the arbor, and the size of the bulge is cylindrical. It is slightly smaller than the inner diameter of the workpiece 100. Engagement grooves 2a and 3a are cut on the outer periphery of the distal end of this bulge, and the collets 6 and 7 are respectively engaged and integrated. The collets 6 and 7 have a large number of grooves cut in the axial direction on their outer peripheries, and are formed to have a size approximately equal to the inner diameter of the cylindrical workpiece 100.

The inner diameters of the collets 6 and 7 are conical, and their inclined surfaces 6a and 7a engage with the inclined surfaces of the bulges 1a and 1b at both ends of the arbor 1, respectively. Therefore, by pressing the sleeves 2 and 3 inwardly against the bulge of the arbor 1, the force is converted into the radial direction via the inclined surface, and the cylindrical workpiece 100 is moved by the collets 6 and 7. It has a holding power.

An adapter 8 is provided on the small diameter shaft 1c side of the arbor 1.
is attached to the main shaft 11 with a bolt 10 via a positioning piece 9. The inside of the adapter 8 has a stepped through hole 8a, and a tapered center 12 is inserted into the small diameter hole 8b, and the groove 8 on the end surface of the adapter 8 is inserted into the small diameter hole 8b.
A driver 13, which is a rotation transmission member, is fitted in c.

The tip of the driver 13 is firmly fixed by inserting one of the small diameter shafts 1c of the arbor 1 and then tightening the bolt 14. For this purpose, a groove 13a is cut in a direction perpendicular to the axial direction.

A tailstock 15 is provided on the side facing the main shaft 11, and its center 16 presses against the inner diameter portion of the floating sleeve 3.

FIG. 2 shows a side sectional view of the jig 17 for attaching and detaching a cylindrical workpiece. In the same figure, there is a mounting hole 18a inside.
There is a fixing block 18 having a diameter, and a driver 13 is fitted into the upper part of the fixing block 18. An L-shaped bracket 19 with an elongated hole 19a cut in the axial direction of the cylindrical workpiece is provided above the side surface of the fixed block 18, and the short side of the L-shape is connected to the cylindrical workpiece 10.
It is attached by a bolt 20 toward the zero center. Elastic pads 21 are fixed to the short sides of the L-shaped bracket 19, and these pads form an attachment/detachment jig.

Next, the operation of the present invention constructed as described above will be explained.

First, outside the machine, the small diameter shaft 1c of the arbor 1 is inserted into the attachment/detachment jig 17 and set. At this time, the fixed sleeve 2, the collet 6 and the floating sleeve 3,
Each collector 7 must be attached to the arbor 1. The machining position of the cylindrical workpiece 100 (point a in Fig. 1A) and the fixed sleeve 2
Alternatively, the positional relationship with the driver 13 etc. is determined by adjusting the L-shaped bracket 19, and the spanner hook N is turned with a spanner or the like.

Fixed side sleeve 2 screwed into threaded part of arbor 1
When the collet 6 moves forward with respect to the arbor 1 by transmission of the rotation of the screw, the collet 6 expands in the radial direction and firmly holds the cylindrical workpiece 100. At this time, the floating sleeve 3 is in a free state because there is nothing to fix it to. That is, the collet 7 is not expanded and is held in a loosely fitted state with respect to the inner diameter of the cylindrical workpiece 100.

Next, the cylindrical workpiece 10 set in the arbor 1
0 from the attachment/detachment jig 17 and remove it from the cylindrical workpiece 1.
Driver 13 integrated with 00 via arbor 1
is inserted into the groove 8c of the adapter 8, and the tip of the small diameter shaft 1c at one end of the arbor 1 is brought into contact with the main shaft 11 and the center 12 in the adapter 8.

Thereafter, the waiting tailstock 15 is moved to the chuck side and pressed against the floating sleeve 3. Due to this pressure, the floating sleeve 3 moves toward the stationary sleeve 2, and the collet 7 moves along the slope of the bulge at the end of the arbor 1 and expands in the radial direction. In other words, the cylindrical workpiece 100 is firmly held from the inside at both ends.

Once the cylindrical workpiece 100 is held, the spindle 11 is rotated by a motor (not shown), the cylindrical workpiece 100 is rotated via the adapter 8 and the driver 13, and the machining positions a and b, for example, are set using a cutting tool (not shown). After cutting off, the inner and outer diameters are chamfered using a chamfering tool.

In this way, the machining positions a and b are adjusted to the cylindrical workpiece 10.
If the fixed sleeve 2 and the collet 6 and the floating sleeve 3 and the collet 7 are set outside of the holding position of 0, the machining of the b position can be performed continuously after the a position.

When the predetermined machining is completed, the rotation of the main shaft 11 is stopped and the rotation of the cylindrical workpiece 100 is stopped. The tailstock 15 is separated from the cylindrical workpiece 100, and the expansion holding force of the floating sleeve 3 and the collet 7 is released. The cylindrical workpiece 100 is pulled out from the adapter 8 while being held by the stationary sleeve 2 and the collet 6, and set in the cylindrical workpiece attachment/detachment jig 17 outside the machine. The cylindrical workpiece 100 is removed by turning the wrench hook of the stationary sleeve 2 in the opposite manner to that described above.

Subsequently, the next cylindrical workpiece is set and the above-described operations are repeated in sequence.

[Effect of idea]

According to the present invention, both ends of the cylindrical workpiece are held from the inner surface by the first and second holding members using a simple device, and predetermined processing is performed, so both ends can be processed one after another without removing the cylindrical workpiece. be able to. This reduces setup time and allows for easy set-up.Since the collet can be forcibly pushed and pulled, it can be clamped securely.
It has become possible to provide a jig for processing cylindrical workpieces that can be unclamped, has good work efficiency, can hold and process even long cylindrical workpieces, and has high productivity.

[Brief explanation of the drawing]

Fig. 1 shows the jig for machining a cylindrical workpiece according to the present invention, Fig. 1A shows an entire side sectional view, Fig. 1B shows a - arrow view in Fig. 1A, and Fig. 1C shows a jig for machining a cylindrical workpiece according to the present invention. Fig. 2 shows a side sectional view of a jig for attaching and detaching a cylindrical workpiece. 1... Arbor, 2... Fixed side sleeve, 3...
Idle side sleeve, 6, 7... Collet, 8... Adapter, 11... Main shaft, 13... Driver, 15
...Tailstock, 17...Attachment/detaching jig, 100...
Cylindrical work.

Claims (1)

[Claims for Utility Model Registration] An arbor having two tapered parts, the ends of which are supported at both ends in the spindle axis direction by a center on the spindle side and a center on the tailstock side; a rotation transmitting member attached to the tip of the main shaft and fixed to the axis of the arbor in order to transmit the rotation of the workpiece; a first collet that holds an inner diameter; and a first sleeve that is screwed onto one end of the arbor and is movable in the axial direction together with the first collet by engaging a groove in the first collet. a second collet provided on the other tapered portion of the arbor and having a groove around the diameter and expanding in the radial direction to hold the inner diameter of the workpiece; a second sleeve that engages with the groove of the collet and is movable in the axial direction together with the second collet;
The first sleeve is rotated and moved in the axial direction to push and pull the first collet, and the second sleeve is moved in the axial direction by relative movement between the spindle side center and the tailstock side center. A jig for machining a cylindrical workpiece, which clamps and unclamps the inner diameter of the workpiece by pushing and pulling a second collet.