JPH0522839Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a balance testing machine used to fix a workpiece to a mounting adapter, especially when performing a balance test on a rotating workpiece having a hole in the center. This invention relates to a workpiece mounting device.

Conventional technology This type of workpiece mounting device has a structure that fits onto the inner diameter surface of the workpiece and applies torque using a pin or key, but due to the gap that exists in the fitting surface, although small, the workpiece is supported eccentrically. However, this method had the disadvantage of causing measurement errors. Another problem was that the work of setting fixing tools such as pins had to be done manually.

In order to solve these problems, a workpiece mounting device as shown in FIG. 4 has been devised. That is, FIG. 4 shows a vertical cross section of the workpiece mounting device of a vertical dynamic balance testing machine, and the mounting adapter, which is the main body of the device, is fitted onto the main shaft (not shown) and is tightened and fixed with bolts 2. A support stand 3 that defines a work reference plane is placed on the upper surface of the bolt 4.
It is tightened and fixed. In addition, a taper collet 6 having a mating surface 6a with an outer diameter approximately equal to the reference inner diameter surface 5b having an inner diameter A with strict dimensional tolerances of the workpiece 5 is attached to the upper outer circumferential surface of the mounting adapter 1 by means of a push-down rod 7 inserted through the mounting adapter 1. It is configured to be moved downward along a tapered surface formed on the surface. When installing the workpiece 5 to be tested, the hole 5 having the workpiece 5 at its center is
With a inserted into the mounting adapter 1, attach it to the support stand 3.
The taper collet 6 is pressed down and brought into pressure contact with the workpiece 5 by the push-down rod 7 placed on top and moved downward by a power source such as a hydraulic cylinder.
to be fixed.

Problems to be Solved by the Invention By the way, the workpiece mounting device connects and clamps the lower surfaces of the mounting base 3 and the taper collet 6 to the lower reference surface 5c and upper reference surface 5d of the workpiece 5, respectively, and also connects the mating surface of the taper collet 6 By joining 6a to the reference inner diameter surface 5b of the workpiece 5, the workpiece 5 can be fixed without eccentricity.

However, the depressing force of the depressing rod 7 acts on the central portion of the taper collet 6;
Since the taper collet 6 is made of a flexible material in order to elastically press against the workpiece 5 and apply torque to the workpiece 5, as shown in the figure, the lower surface and the mating surface 6a of the taper collet 6 are respectively The workpiece 5 may be chucked in a state where it is not accurately joined to the upper reference surface 5d and the reference inner diameter surface 5b of the workpiece 5, and there is a problem that the workpiece 5 cannot be positioned and fixed with high precision. Furthermore, if the downward force of the push-down rod 7 on the taper collet 6 is applied suddenly or is too strong than necessary, the taper collet 6 may be damaged and the workpiece 5 may be damaged.

This idea was made in view of the above circumstances, and by adopting a configuration in which the collet is in contact with the workpiece without sliding, it is possible to achieve a balance that allows the workpiece to be positioned and chucked with high precision. The purpose is to provide a workpiece mounting device for testing machines.

Means for Solving the Problems The workpiece mounting device of the balancing tester according to this invention includes a workpiece mounting collet that is in the shape of a flat ring and has a plurality of notches radially extending in the radial direction, and a workpiece mounting An axial expansion member located in the hole of the collet and expands to expand the diameter of the workpiece mounting collet so as to press it against the reference inner diameter surface of the workpiece, and an axial expansion member that is inserted into the mounting adapter that fixes the workpiece and moves in the axial direction. and an operating shaft that operates the shaft expansion member to expand.

Function When the operating shaft moves in the axial direction when mounting a workpiece, the shaft expansion member located in the hole of the workpiece mounting collet operates and expands, and this expansion expands the diameter of the workpiece mounting collet and causes its outer circumferential surface to expand. It presses against the reference inner diameter surface of the workpiece and fixes the workpiece.

Embodiment Hereinafter, one embodiment of this invention will be described based on the drawings.

FIG. 1 is a vertical cross-sectional front view showing one embodiment,
The same parts as in FIG. 3 are given the same reference numerals.

As shown in Fig. 2, the workpiece mounting collet 8 is
It has a planar ring shape as a whole and is divided into 8 parts.
a, and a plurality of (in this example, 5
It has a shape in which several slit-like notches 8b are formed. The outer diameter of this is slightly smaller than the inner diameter A of the reference inner diameter surface 5b of the workpiece 5 to be tested, and an insertion hole 8c is formed at an appropriate location.

A well-known shaft expansion member 9 is disposed in the hole 8d of the workpiece mounting collet 8, and this shaft expansion member 9 is pushed up by a hydraulic cylinder or the like of an automatic chucking device of a dynamic balance tester. It is connected to an operating shaft 10 consisting of a push rod. Since this shaft expansion member 9 is well-known, it will be briefly explained.As shown in FIG.
When the piston 9a is actuated, the special hydraulic oil 9b pressurized by the piston 9a flows through a plurality of radially formed oil passages 9d in the direction of the arrow shown in the figure, and passes through the metal ring-shaped shell portion 9c. It expands by pressing outward, and expands and contracts with extremely high reproducibility.

Further, a pin 11 is installed upright on the support stand 3 at a position corresponding to the through hole 5e provided in the workpiece 5 to be tested, and a pin 11 is also installed on the workpiece mounting collet 8 at a position corresponding to the pin 11. An insertion hole 8e is provided. In this way, the pin 11 of the support base 3 integrated with the mounting adapter 1 is connected to the through hole 5e of the workpiece 5.
By inserting the workpiece through the insertion hole 8e of the workpiece mounting collet 8, the workpiece 5 and the workpiece mounting collet 8 are prevented from slipping against the rotational force of the mounting adapter 1, and the rotational torque is reliably applied to the workpiece 5 and the workpiece mounting collet 8. It is beginning to give.

Next, the operation of the above-mentioned embodiment will be explained. When the operating shaft 10 is in a backward or downward movement state, the shell portion 9c of the shaft expansion member 9 is contracted. In this state, the workpiece 5 to be tested is placed on the support stand 3 by inserting the pin 11 through the through hole 5e thereof, and the workpiece 5 is placed on the support base 3 by inserting the pin 11 through the through hole 8e of the workpiece mounting collet 8 as well. Place it on top. At this time, since the outer diameter of the mating surface 8f, which is the outer peripheral surface of the workpiece mounting collet 8, is slightly smaller than the inner diameter A of the reference inner diameter surface 5b of the workpiece 5, the workpiece mounting collet 8 is attached to the reference inner diameter surface of the workpiece 5. 5b, and workpiece mounting collet 8
It is securely joined to the upper reference surface 5d.

Then, the operating shaft 1 is adjusted by the automatic chucking device.
0 moves upward, the shaft expansion member 9 operates as described above, and the shell member 9c expands it as shown by the dashed line in FIG. The peripheral edge of the hole 8d of the workpiece mounting collet 8 is pressed outward by this expanded shell portion 9c, and the diameter of the workpiece mounting collet 8 is expanded by having the splits 8a and notches 8b radially. The workpiece 5 is deformed and press-contacted to the reference inner diameter surface 5b of the workpiece 5 in a bonded state without causing a gap, and the workpiece 5 is securely fixed.

In addition, although the dynamic balance tester was illustrated and demonstrated in the Example, it is applicable also to a static balance tester.

As explained above, according to the work mounting device of the balancing machine of this invention, the work mounting collet, which has a slot, is expanded in diameter by the expansion of the shaft expansion member, and the outer circumferential surface of the work mounting collet is pressed against the reference inner diameter surface of the work to fix the work, so that the work mounting collet can be reliably joined to the reference inner diameter surface of the work, and the work can be positioned and fixed with high precision.

In addition, unlike conventional equipment, where the workpiece mounting collet slides and press-fits into the reference inner diameter surface of the workpiece, the diameter of the workpiece mounting collet is enlarged and the workpiece is pressed into contact with the workpiece, so deformation and wear of the workpiece mounting collet are extremely small. The workpiece mounting collet can be maintained with high precision to maintain a long life, and the workpiece will not be damaged.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the workpiece mounting device of the balancing tester of this invention, Fig. 2 is a plan view of the workpiece mounting collet of Fig. 1, and Fig. 3 is the axial expansion member of Fig. 1. FIG. 4 is a partially cutaway perspective view of the conventional device. 1...Mounting adapter, 5...Work, 5b...
...Reference inner diameter surface, 8...Divide, 8d...Hole, 9...
... Shaft expansion member, 10... Operating shaft.

Claims (1)

[Scope of utility model registration request] a workpiece mounting collet which is in the shape of a flat ring and has a plurality of notches radially extending in the radial direction;
An axial expansion member is positioned in the hole of the workpiece mounting collet and expands to expand the diameter of the workpiece mounting collet so as to press it against the reference inner diameter surface of the workpiece, and an axial expansion member is inserted into the mounting adapter that fixes the workpiece in the axial direction. 1. A workpiece mounting device for a balance testing machine, comprising: an operating shaft that operates to expand the shaft expansion member by moving the shaft to the shaft.