JPH0819930A - Positioning pin device - Google Patents

Abstract

PURPOSE:To make a positioning pin device to position a work compact. CONSTITUTION:A positioning pin 15 of a positioning pin device 10 fit in a cast through hole H1 of a work W is inserted through an elliptical hollow hole 12b of a support case 12, a clearance 6 in the pitch direction of the cast through hole H1 is provided between itself and the support case 12, the positioning pin 15 is supported free to move in the axial CL1 direction by inserting an oscillating support pin 16 supported on the support case 12 into a slot 15a formed on the positioning pin 15 and it is supported free to oscillate in the pitch direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a workpiece which is fitted into one of two casting holes of a workpiece when a reference surface or a reference hole is formed in the workpiece and absorbs a pitch error between the casting holes to position the workpiece. A positioning pin device.

[0002]

2. Description of the Related Art Conventionally, when a reference surface or a reference hole, which is a processing reference, is generally formed on a cast work, one of two positioning casting holes provided in advance in the work is provided in the axial direction of the reference positioning pin device. A reference positioning pin that moves only is fitted in the other casting hole, and the other casting hole has a positioning pin device for absorbing a pitch error, which is a line segment direction connecting the axial direction and the center of the two casting holes (hereinafter, pitch direction). ), A movable positioning pin is fitted, and the pitch error between the two casting holes is absorbed by the movement of the latter positioning pin in the pitch direction.
Further, the draft of the casting hole and the variation of the hole diameter are absorbed by the axial movement of the corresponding positioning pin in each casting hole to position the work. In the latter positioning pin device, a slider shaft 5 is movably supported by a linear bush 4 in a pitch direction on a support case 3 integrally fixed to a jig base 1 as shown in FIG.
The positioning pin 7 is movably inserted in the axial direction orthogonal to the pitch direction to the support sleeve 6 integrally fixed to the support sleeve 6, and is biased by the spring 8 toward the head portion 7a of the positioning pin 7. The head portion 7a was fitted into one of the casting holes H. Further, in this positioning pin device, a dustproof seal is attached to the moving slider shaft 5, the positioning pin 7, and the support sleeve 6 to prevent chips, coolant, and the like from entering.

[0003]

As described above, the casting hole of the work has a draft, a hole diameter, a hole pitch error, and the like. Therefore, in order to absorb these errors, the positioning pin device described above is used. Then, a device for moving the casting pin of the positioning pin 7 in the pitch direction and in the axial direction is separately housed in the support case and the hollow sleeve 6. Therefore, there is a first problem that the entire apparatus becomes large and the mounting space for the jig base 1 becomes large.
Further, the seal of this device is exposed to the outside, and there is a second problem that is insufficient to prevent the intrusion of foreign matter such as chips and coolant. A first object of the present invention is to obtain a positioning pin device which is compact and has a small mounting area. A second object of the invention is to obtain a positioning pin device having a cover structure having a small number of sealing portions and good dustproofness.

[0004]

In order to solve the first problem, according to the invention of claim 1, there is provided a positioning pin device which is fitted into one of the two casting holes of the work, and which is integrated with the jig base. With respect to the fixed support case, a positioning pin having a head fitted into the casting hole is
In a positioning pin device which is configured to move in the pitch direction of the two casting holes and in which the positioning pin is biased toward the head by a spring, the support case is a hollow sleeve, A long hole formed in the positioning pin by inserting the positioning pin into the hollow hole with a gap in the pitch direction between the hollow hole and the swinging support pin on the side opposite to the positioning pin head of the support case. The oscillating support pin is inserted into the shaft to support the positioning pin so as to be movable in the axial direction and oscillatably in the pitch direction, and the spring is interposed between the oscillating support pin and the positioning pin. To do. In order to solve the second problem, in the invention of claim 2, the positioning pin is integrally provided with a dustproof cover for covering the support case in the direction of the support case from the head of the positioning pin protruding outward from the support case. It is characterized by being provided.

[0005]

According to the present invention, when there is an error in the pitch direction between the two cast holes of the work, the positioning pin is imperfectly fitted in the cast hole and resists the spring force in the device of the present application. It is pushed down and the long hole is guided by the rocking support pin to move in the axial direction. At the same time, it is rocked in the pitch direction of the two casting holes based on the rocking support pin so that the head part becomes the casting hole. Fully fit. As a result, the two casting holes are positioned to reliably position the work. Further, in the second aspect, since the support case is covered with the dust-proof cover, chips and the like do not enter.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, reference numeral 1 designates a jig base of a machine tool for surface machining, hole machining, etc.
Is integrally provided, and the work W is placed on the pad 2 for processing. The work W is a cast product, and the two reference casting holes H used when processing the work W itself such as the reference surface A or the reference hole B when processing the work.
1 and H2 are provided in advance. A positioning pin device 10 for absorbing a pitch error and a reference positioning pin device 11 are mounted on the jig base 1 in correspondence with one of the cast holes H1 of the work W and the other of the cast holes H2.

Positioning pin device 10 for absorbing pitch error
2, the support case 12 is fitted into the through hole 1 a formed in the jig base 1, and the notch 12 a is locked to the head of the mounting bolt 13 fastened to the jig base 1 to fix the jig base 1. It is fixed to. The support case 12 is a hollow sleeve, and as shown in FIG. 3, a positioning is made up of a head portion 14 and a pin body 15A to be fitted into the cast hole H1 of the work W, into an elliptical or oval hollow hole 12b of the hollow sleeve. Pin 1
5 is inserted. Between the positioning pin 15 and the hollow hole 12b, the positioning pin 1 is arranged in the pitch direction of the casting holes H1 and H2.
A gap ε is formed so that 5 can move.

Further, a swing support pin 16 is provided on the lower portion of the support case 12 (on the side opposite to the head portion 14) so as to be orthogonal to the axis CL1 of the positioning pin 15, and the vertical direction is provided below the positioning pin 15. The rocking support pin 16 is inserted into the long hole 15a of
The locating pin 15 is movably supported in the pitch direction and movable in the axis CL1 direction with the oscillating support pin 16 as a reference. In addition, a spring 17 is built in between the swing support pin 16 and the positioning pin 15,
5 is biased toward the head 14 by a spring force. The pin body 15A of the positioning pin 15 and the head portion 14 are integrated by screwing the screw portion at the lower end of the head portion 14 into the pin body 15A. The head portion 14 is formed in a tapered shape with a small diameter portion d2 at the upper end and a large diameter portion d3 at the lower end with reference to a reference portion d1 that is equal to the diameter D1 of the casting hole H1.
Even if there is a hole diameter error of 1 and a draft, the small diameter portion d2 is inserted into the casting hole H1 and the positioning pin 15 descends,
An appropriate diameter portion of the head 14 is fitted into the diameter D1 of the casting hole H1 to position the work W on the jig base 1.

The positioning pin 15 has a support case 12 attached thereto.
A dustproof cover 18 for covering the support case 12 is integrally provided by screwing the head portion 14 toward the support case 12 from the lower end of the head portion 14 protruding outward from the upper end. The dust-proof cover 18 has a skirt 18a facing downwards in the support case 12.
The outer periphery of the upper end of the support case 12 is surrounded while covering the upper part so that a small gap is formed between the outer periphery and the outer periphery of the support case 12 to prevent chips and coolant from entering. Further, the inner space of the dustproof cover 18 communicating with this gap provides a space between the upper end of the support case 12 and the support case 12 so that the dust cover 18 can move toward the support case 12.

Next, the reference positioning pin device 11 is used in combination with the positioning pin device 10. The difference from the positioning pin device 10 is that the positioning pin 15 moves in the direction of its axis CL1. By itself, there is no swing in the pitch direction, and the other support case 12A corresponding to the support case 12 of the positioning pin device 10 is not provided with the gap ε formed in the pitch direction.
The point is that the hollow hole of 2A is circular. Therefore, the positioning pin device 11 only absorbs the error of the draft of the casting hole H2 and the hole diameter, and the positioning pin 15 of the positioning pin device 10 swings in the pitch direction with respect to the positioning pin device 11. This absorbs the pitch error.

Next, the operation will be described. When the workpiece W is placed on the jig base 1 for processing the reference surface A or the like, the positioning pin 15 of the positioning pin device 11 is lowered by engaging with the casting hole H2, and the head portion is moved. An appropriate diameter portion of the tapered surface of 14 is fitted into the casting hole H2 to absorb the draft of the casting hole H2 and the variation in hole diameter. On the other hand, the head 1 of the positioning pin 15 of the positioning pin device 10
No. 4 engages with the casting hole H1 when the workpiece W is placed on the processing table 2 on the jig base 1, and the positioning pin 15 moves in the direction of the axis CL1 against the spring force of the spring 17. By moving in the pitch direction, variations in hole diameter and pitch error are absorbed, and the diameter D1 of the casting hole H1 and an appropriate diameter portion of the taper portion of the head portion 14 match each other so that the casting hole H1 is completely removed. Be inserted. Thus, the work W is the jig base 1
It is placed and positioned on top.

In the invention of claim 1 according to this embodiment, since the positioning pin of one positioning pin device is swung in the axial direction and in the pitch direction of the two casting holes to perform positioning, the device itself can be made compact, Moreover, the error of the casting hole can be absorbed, and the work can be surely positioned. Further, in the invention of claim 2, there is only one place where dust protection is required at the upper end of the support case, and since the upper end of the support case is covered with the dust cover, foreign matter does not enter.

[0013]

As described above, according to the first aspect of the present invention, the positioning pin of the positioning pin device which is fitted into the casting hole of the work is housed in the support case, and is cast by the engagement of the swing support pin and the long hole. Since the movement of the punched hole in the pitch direction and the movement in the axial direction are performed, the apparatus itself can be made compact, the mounting area can be reduced, and the apparatus can be mounted in a limited place. Further, in the invention of claim 2, the place where the seal is required is made as small as possible at one place on the upper end of the support case, and the support case is covered with the dustproof cover integrated with the positioning pin, so that the dustproof property can be improved. .

[Brief description of drawings]

FIG. 1 is a plan view of a positioning pin device according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is an explanatory diagram of a conventional positioning pin device.

[Explanation of symbols]

1 jig base, 10 positioning pin device, 12
Support case, 12b hollow hole, 14 head, 15
Positioning pin, 15a long hole, 16 rocking support pin,
17 springs, 18 dust cover, H1, H2 casting holes, CL1 axial direction, W work, ε clearance

Claims (2)

[Claims] 1. A positioning pin device which is fitted into one of two casting holes of a work, and has a head which is fitted into the casting hole with respect to a support case integrally fixed to a jig base. A positioning pin device in which a positioning pin is configured to move in an axial direction thereof and a pitch direction of the two casting holes, and the positioning pin is urged by a spring toward a head. Is used as a hollow sleeve, and the positioning pin is inserted into the hollow hole of the support case with the gap in the pitch direction between the hollow case and the support case. Is provided, and the rocking support pin is inserted into the long hole formed in the positioning pin to support the positioning pin so as to be movable in the axial direction and to be rockable in the pitch direction, and between the rocking support pin and the positioning pin. The spring A positioning pin device characterized by being inserted. 2. The positioning pin includes a positioning pin projecting outward from the support case, and a positioning pin facing toward the support case.
The positioning pin device according to claim 1, further comprising a dustproof cover integrally provided to cover the support case.