JPS604644Y2 - Workpiece support device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a workpiece support device for cutting a workpiece having a small-diameter hole in the center, such as a rotor of a motor, to an outer diameter using this hole as a reference.

Conventionally, a workpiece support device used when cutting the outer diameter of a workpiece having a small-diameter hole in the center using the hole as a reference has been used to insert the workpiece through a reference rod on the spindle axis and use a chuck to cut the workpiece. Either the workpiece was tightened, or the workpiece was pressed against the edge driver to force the tip of the edge driver into the workpiece.

However, in both cases, because the reference rod is thin, the workpiece is tilted depending on the condition of the outer peripheral surface or end surface of the workpiece, making it impossible to perform accurate cutting using the hole as a reference.

The purpose of this invention is to solve the above-mentioned conventional drawbacks.The workpiece is inserted into the reference rod attached to the center spindle, the workpiece is pushed from the tailstock side to the headstock side with a spring, and the workpiece is chucked. It is designed to be rotated through a spike-shaped driver installed with a small gap between both the workpiece and the workpiece, and in this state, the outer diameter is machined based on the hole in the workpiece. , it is possible to perform accurate turning processing.

Hereinafter, embodiments of the workpiece support device of the present invention will be described based on the drawings.

1 to 4, reference numeral 1 denotes a chuck fixed to the end of a rotatable main shaft (not shown), and a mounting body 3 is fixed to the front surface of this chuck 1 so as to cover gripping claws 2.

A bushing 4 having a hole with the same diameter as the reference hole of the workpiece is fixed in the center of the mounting body 3 by a threaded member 5, and there is a space between the outer circumference of the bushing 4 and the threaded member 5 in the radial direction. A spike-shaped driver 6 having a plurality of rectangular protrusions extending in the radial direction and the axial direction is loosely fitted so as to be slightly movable.

That is, the inner diameter of the driver 6 is a hole slightly larger than the outer diameter of the bushing 4, and the threaded member 5 is provided with a spider hole that is slightly larger than the driver 6.

The driver 6 is dimensioned to protrude from the end surface of the screw member 5.

Reference numeral 7 denotes a workpiece, and the end face of the workpiece 7 to be attached to the chuck 1 is provided with a spider hole into which the driver 6 can be loosely inserted.

That is, the size of the spider hole carved in the workpiece 7 is slightly larger than that of the driver 6.

In this way, the driver 6 applies only the rotational force of the main shaft to the screw member 5.
It will be transmitted to the workpiece 7 via.

Reference numeral 8 denotes a tailstock shaft of a tailstock disposed on the same axis as the main spindle axis and facing the chuck 1. A holder 9 is attached to the tip of the tailstock shaft 8, and a holder 9 is attached to the front surface of the holder 9. A bracket 10 is fixed.

A shaft 11 is supported in the center of the bracket 10 so that its movement in the axial direction is restricted.

At the tip of this shaft 11 there is a reference rod 12 machined to have the same dimensions as the reference hole of the workpiece 7, and when installing the workpiece, the reference rod 12 is inserted into the workpiece 7 and the bush 4 is inserted into the bushing.
is held in the center hole.

Further, the shaft 11 is provided with a spring member 13 that lightly presses the workpiece 7 toward the chuck 1 when the workpiece is attached to an extent that the workpiece 7 and the driver 6 do not come out of engagement.

In the above configuration, when machining the workpiece 7, the workpiece 7
The radial position of is determined by the reference rod 12, and the axial position is determined by pressing the workpiece 7 against the end face of the driver 6 by the spring member 13.

The rotation of the main shaft (not shown) is transmitted from the chuck 1 to the workpiece 7 via the screw member 5 and the driver 6.
As the workpiece 7 rotates, the shaft 11 and the spring member 13
will also rotate together.

Next, the effects of the workpiece support device of the present invention will be explained.

As mentioned above, the driver 6 is installed so that it can be displaced in the radial and axial directions with respect to the workpiece 7 attached to the reference shaft, and the workpiece is only lightly pressed toward the chuck. As a result, no tilting force is applied to the workpiece 7, so that highly accurate turning can be performed.

Furthermore, since the driver 6 has a spike shape with a plurality of rectangular protrusions extending in the radial direction, only the rotational force is transmitted from the driver 6 to the workpiece 7 during rotation transmission, and the radial force is not transmitted. Turning can be performed with high accuracy without causing misalignment of the object 7.

Further, the spike-shaped hole carved in the workpiece 7 does not need to be machined with high precision, and the hole is easily machined.

Further, the reference rod 12 rotates together with the workpiece 7 during turning, and no frictional heat is generated between the workpiece 7 and the reference rod 12.

Furthermore, when the rotational speed suddenly changes to a state in which the workpiece 7 rotates normally, the workpiece 7 moves toward the chuck, creating a gap between the turning tool and the workpiece 7, which prevents impact from being applied to the tool. .

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an example of the workpiece support device of the present invention, FIG. 2 is a sectional view taken along the line n-n' in FIG.
Figure 4 is a cross-sectional view taken along line mm--IV' in Figure 1.
FIG. 1... Chuck, 4... Bush, 5
...Screw member, 6...Screwdriver, 7
... Workpiece, 8 ... Tailstock shaft, 12 ...
...Reference rod, 13... Spring member.

Claims (1)

[Scope of utility model registration request] A device that engages a workpiece having a small diameter hole in the center with a chuck fixed to the end of a rotatable main shaft, and turns the outer diameter of the workpiece with reference to the small diameter hole, so that the workpiece can be rotated around the center axis of the lathe. an attached reference rod; a spring member that supports the workpiece movably in the spindle axis direction on the reference rod and presses the workpiece from the tailstock side to the headstock side during cutting;
A bushing provided on the chuck and having a center hole for holding the tip of the reference rod, and a bushing inserted into the outer periphery of the bushing and leaving a small gap in the radial direction with respect to both the chuck member and the workpiece. and a spike-shaped driver that is loosely fitted into the workpiece and that is always in contact with the workpiece pressed by the spring member in the axial direction and rotates the workpiece normally when engaged. Object support device.