JPS6216247Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a collect jig for attaching each workpiece to a lathe spindle when turning a thin-walled ring-shaped workpiece.

When a large number of pieces are manufactured in one lot and the turning process involves multiple steps, a method is adopted in which lathes are arranged for each step and the workpieces are sequentially conveyed to these lathes, attached, and processed. In this case, the workpiece itself is normally transported and attached to the main spindle of the lathe, and it has not been conventionally done to attach the workpiece to the main spindle using jig setup. However, when it comes to thin-walled ring-shaped workpieces, it takes time to center them when they are attached to the main spindle of a lathe, and if the centering is done every time the lathe is changed, machining efficiency will decrease. It turns out.

Therefore, in this invention, each ring-shaped workpiece is
The workpieces are attached to the collect jig one by one, transported, and attached to the lathe spindle for each jig.The workpieces are mounted on the collect jig placed side by side on the support stand, and the clamping force and gripping allowance are adjusted to the workpiece. The collet can be adjusted from the front end according to the situation.

Embodiments of the present invention will be described below with reference to the drawings. The collecting jig main body 1 has a large diameter stepped center hole, and has a flange portion 4 with a tapered shank portion 2 and a V-groove 3. A pull stud 6 having a through hole 5 is attached to the rear end surface of the tapered shank portion 2. A collet 7 for gripping the inner diameter of the workpiece is fixed to the front surface of the center hole of the flange portion 4. A sleeve-shaped drawbar 8 having a female thread at its tip is inserted into the inner diameter collet 7 and the main body 1. The outer peripheral surface of the tip of the draw bar 8 has a conical shape, and opens and closes the collet 7 by moving in the axial direction. A male screw member 9 is attached to the center of the drawbar 8 by a key so as to be movable in the axial direction. A female threaded member 10 that engages with this male threaded member 9 is attached inside the flange portion 4 in a state where rotation is prevented. A spring receiver 11 is attached to the rear of the drawbar 8 in the central hole of the main body 1, and a spring 12 is tensioned between the spring receiver 11 and the male threaded member 9, and the drawbar 8 is moved in the direction in which the collet 7 opens. is energized.
A hole 13 for attaching a wrench is bored in the front end surface of the drawbar, and the drawbar can be attached to the main body 1.
By rotating the male threaded member 9 in the axial direction, the force of the spring 12 can be adjusted. A stepped screw shaft 14 is inserted into the center of the drawbar 8, and a threaded portion 15 at the tip
is engaged with the female thread at the end of the drawbar 8.
When the drawbar 8 is moved back in the axial direction by the spring 12, the stepped portion 1 of the screw shaft 14
6 hits the front end surface of the pull stud 6, and the backward movement is stopped. The screw shaft 14 also has a hole 17 for a wrench drilled in its front end surface.
4 relative to the drawbar 8, the position in the axial direction with respect to the drawbar 8 changes, and the retracted position of the drawbar 8 changes. Further, the rear portion 18 of the screw shaft 14 projects rearward from the through hole 5 of the pull stud 6.

Next, the effect will be explained. Usually, a large number of collect jigs having the above configuration are attached to the support base 20. A pusher (not shown) is provided on the support base, and by pushing the rear part 18 of the screw shaft 14 toward the front of the collet jig, the diameter of the collet 7 is reduced and the workpiece is inserted into the collet 7. Make it easier. When the pusher is retracted after inserting the workpiece, the force of the spring 12 causes the collet 7 to open and clamp the workpiece. At this time, in order to adjust the opening margin of the collet 7 and the clamping force of the workpiece due to the spring force, the drawbar 8 and screw shaft 14 are turned with a spanner from the front of the collet jig to adjust the position of the male threaded member 9 and the retreating end of the drawbar 8. make the position change. Thereafter, the V-groove 3 of the flange portion 4 is held by a conveying means (not shown) and the collet jig is attached to the main shaft of the lathe.

As detailed above, in this invention, a thin ring-shaped workpiece is attached to a jig and transported between lathes, making it very easy to center the workpiece when attaching it to each lathe spindle. Summer. Furthermore, the opening margin and clamping force of the collet can be optimally adjusted from the front of the collet jig according to the wall thickness of the ring-shaped workpiece with the workpiece inserted, making adjustment very easy. Furthermore, since a spring is housed within the jig to constantly apply clamping force to the workpiece, it will not loosen during transportation or cutting.

[Brief explanation of the drawing]

The figure is a sectional view of a collect jig according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Main body, 7...Inner diameter collet, 8...Draw bar, 9...Male thread member, 10...Female thread member, 11...Spring receiver, 12...Spring, 13...
Hole, 14...screw shaft, 16...step, 17...
hole.

Claims (1)

[Scope of utility model registration request] A main body that can be attached to a lathe main shaft and has a stepped center hole, a collet for gripping the inner diameter of a workpiece fixed to the front surface of the center hole of the main body, and a female screw housed in the center hole of the main body so as to be prevented from rotating. a sleeve-like drawbar which is inserted through and accommodated in the central hole of the main body and the collet so as to be movable in the axial direction, has a conical shape at the tip that opens the collet, and has a female thread carved therein; a male threaded member fitted to the drawbar so as to be movable only in the axial direction; a spring holder fixed to the rear part of the drawbar within the center hole of the main body; and a spring holder stretched between the male threaded member and the spring holder. a spring that biases the collet in the direction of opening; a threaded shaft that is inserted through the center of the drawbar, has a step that engages with a female thread of the drawbar, and comes into contact with a center hole step of the main body, and that protrudes toward the rear of the main body; A collet, further comprising a hole for attaching a spanner to the front end face of the drawbar and the screw shaft, so that the clamping force of the workpiece and the opening width of the collet can be adjusted from the front. jig.