JPH088048Y2 - Jig for centering - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering jig used when positioning a welded product, a drilled product or the like which is machined on the basis of a hole or an axis.

[0002]

2. Description of the Related Art A conventional centering jig based on a hole such as a welding process is inserted into a guide 21 of a jig 20 and slides reciprocally, as shown in FIG. In addition, the reference shaft 22 whose tip is chamfered 22a
It was fitted in the reference hole 24a, positioned, and fixed to the jig 20 by the clamp 25. When the reference shaft 22 is fitted into the reference hole 24a, the chamfered portion 22a at the tip of the reference shaft 22 corrects the positional deviation of the welded product 24 and fits it. Further, as shown in FIG. 6, the centering jig based on the shaft reference is inserted into the guide 21 of the jig 20 and slidably reciprocally moved, and the tip end is chamfered 22a. Was fitted to the reference shaft 25 of the welded product 24, positioned, and fixed to the jig 20. When the reference hole 22b is fitted into the reference shaft 25 of the welded product 24, the chamfer 22a at the tip of the reference hole 22b corrects the positional deviation of the welded product 24 and fits the reference hole 22b.

Further, as described in Japanese Utility Model Application Laid-Open No. 48-66175, the tip of a fixed shaft into which a cylindrical portion is fitted to a centering member material is formed into a conical shape, and the conical portion slides the radial direction. In the state where a contactor that moves back and forth is formed and a centering member smaller than the centering hole is inserted into the centering hole of the workpiece,
There is a centering device in which the contactor is projected outward from the contactor and brought into contact with the inner surface of the centering hole to perform centering. Further, Japanese Utility Model Publication No. 60-1958 discloses a stopper which is detachably attached to a tip of a centering shaft in a positioning device by a bolt and is integrally formed with a sleeve.

[0004]

In the conventional centering jig based on the hole, when the guide 21 and the reference hole 24a of the welded product 24 are misaligned, the reference shaft 22 is inserted into the reference hole 24a. Since it is difficult to enter, the chamfer 22 at the tip of the reference shaft 22
The welded product 24 was fitted in while correcting the positional deviation by the portion a. However, if the chamfer 22a is small, it is difficult to fit it in the reference hole 24a, and thus positioning is difficult. If the reference shaft 22 is used frequently in such a state, the chamfer 2
There is a problem that the accuracy of positioning and the life of the reference shaft 22 are shortened due to wear and damage of the 2a portion. Further, even if the reference shaft 22 is fitted into the reference hole 24a of the welded product 24 and the centering is accurately performed, the position of the welded product 24 is displaced due to the distortion of the clamp 25 after the centering and the welding and the like. The shaft 22 and the welded product 24 are twisted, and the reference shaft 2 after welding
2 is difficult to come off, which requires a large force and hinders workability. Similarly, in the case of the centering jig based on the axis, it is difficult to position the welded product 24 for the same reason as the centering jig based on the hole.
In addition, the chamfered portion 22a of the reference hole 22b is worn or damaged, and there is a problem that the positioning accuracy and the life of the centering shaft 22 are reduced. Even if the centering is accurately performed, the work piece 24 may be deformed due to a processing strain such as welding after the centering.
Has a drawback that the centering shaft 22 and the welded product 24 are misaligned and the centering shaft 22 is less likely to come off after welding, which requires a large force and impairs workability.

Further, in the one disclosed in Japanese Utility Model Laid-Open No. 48-66175, a gap is created between a centering hole of a workpiece and a centering member smaller than the centering hole, and slides in a conical portion. It is limited to a centering device that stably mounts a workpiece on a horizontal substrate and moves a fixed shaft up and down only by supporting it not at the contact surface but at a plurality of points by a contactor. In the case of the shaft, there is a problem that a work piece that is not directly placed on the substrate is unstable. In addition, real public Sho 60-195
Even in the case of the No. 8 publication, even if the centering is accurately performed, the position of the work piece is displaced due to the processing distortion such as welding after the centering, and the welded work piece and the sleeve are misaligned. Since there is no gap between the sleeve to be fitted in the cylindrical portion and the welded product at the time of returning, there is a defect that the sleeve cannot be removed or a drawing-out scratch remains inside the centering hole of the workpiece. Further, neither of them has a description item about the centering jig based on the reference axis of the welded product or a matter derived from the description item.

[0006]

SUMMARY OF THE INVENTION The present invention has a simple structure as a solution in view of the problems of the conventional centering jig based on the hole reference or the axis reference such as welding and the like, and further Even if there is a misalignment with the reference hole of the welded product, or a misalignment between the reference hole of the centering shaft and the reference shaft of the welded product,
The centering of the welded product can be easily performed, and even if the reference shaft and the welded product or the reference hole of the centering shaft and the welded product are misaligned due to welding distortion, etc. The present invention provides a centering jig that can be easily removed.

The centering jig has a taper shaft at its tip and is reciprocally movable in the horizontal direction by being inserted into a guide body, and the outer periphery of the centering hole comes into contact with a reference hole of a workpiece to be freely inserted and removed. An adapter that can be fitted only to the tapered shaft, a positioning stopper for the adapter that is fitted into the reference hole, and a retaining member for the centering shaft that is detachably formed at the tip of the tapered shaft, The retaining member is provided at a distance from the adapter in a state where the tapered shaft and the adapter are fitted to each other.

Further, a centering shaft having a tapered shaft at its tip and being reciprocally movable in the horizontal direction by being inserted into a guide body, and a stepped reference hole at the tip of which the inner surface comes into contact with the reference shaft of the workpiece and can be freely inserted and removed. An adapter that can be fitted only to the tapered shaft, a positioning stopper for the adapter fitted to the reference shaft, and a retaining member for the centering shaft that is detachably formed at the tip of the tapered shaft. The retaining member is provided so as to be separated from the adapter in a state in which the taper shaft and the adapter are fitted to each other.

[0009]

[Function] Insert the taper shaft so that the tip projects out of the adapter, and attach the adapter that attaches the retaining member to the tip so that the taper shaft does not come out backward. Inserts and holds the work piece stably. At this time, the adapter fitted into the reference hole and only the tapered shaft have a tapered structure, so that the workpiece can be easily centered. In this state, perform processing such as welding, and after processing, if the centering shaft is pulled out backward by the distance between the retaining member and the adapter, first there is a gap between the tapered shaft at the tip and the taper part of the adapter. It can be done and there is no pressure applied to the adapter, so if the centering shaft is further pulled out backward, the adapter can be easily pulled out from the work piece. After pulling out, the centering shaft can be easily pulled out from the adapter by unfastening the retaining member.

In addition, a taper shaft is inserted so that the tip projects to the bottom of the stepped reference hole in which the adapter can be fitted and removed, and an adapter is attached to the tip so that the taper shaft does not come out backward. , Hold the work piece stably by fitting the stepped reference hole at the tip end into the reference axis of the work piece until it stops with the stopper. At this time, since the adapter fitted to the reference shaft and only the tapered shaft have a tapered structure, the work can be easily centered. In this state, perform processing such as welding, and after processing, if the centering shaft is pulled out backward by the distance between the retaining member and the adapter, first there is a gap between the tapered shaft at the tip and the taper part of the adapter. Because it can be done, there is no pressure on the adapter,
Furthermore, if the centering shaft is pulled out backward, the adapter can be easily pulled out from the work piece. After pulling out, the centering shaft can be easily pulled out from the adapter by unfastening the retaining member.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a centering jig according to the present invention will be described with reference to the accompanying drawings showing the cross section of the centering jig according to the axis reference in FIGS. 1, 2 and 3. 1 and 2,
Reference numeral 1 is a guide of a welding jig. A main reference shaft 2 as a centering shaft is inserted through the guide 1, and the main reference shaft 2 is driven by a drive source (not shown) along the guide surface in the left-right direction of the drawing, that is, horizontally. It can be reciprocally moved in any direction. A sub-reference shaft 3 having a predetermined taper is integrally provided at the tip of the main reference shaft 2 as a tapered shaft.
Reference numeral 4 is a welded product, and reference holes 4a are formed at appropriate places. Reference numeral 5 denotes a ring adapter as an adapter, which is formed so that the outer periphery is in contact with the reference hole 4a of the welded product 4 and can be inserted and removed freely, and only the sub reference shaft 3 can be fitted, and does not contact the cylindrical portion 5a. Is equipped with. The tip of the ring adapter 5 is largely chamfered 5b so that it can be easily fitted into the reference hole 4a, and the reference hole 4a is provided on the opposite side.
A collar 5c is provided as a stopper that comes into contact with the welded product 4 when it is fitted into the. As an adapter,
In addition to the above ring adapter, a rectangular adapter may be used.

Further, a retaining member is formed at the tip of the sub reference shaft 3 as follows. That is, a screw hole 3a is threaded in the tip of the sub reference shaft 3, and a collar 6 having a diameter larger than the diameter of the tip surface of the sub reference shaft 3 and smaller than the inner diameter of the reference hole 4a is formed in the screw hole 3a. A hexagon bolt 7 that is screwed into the screw hole 3 a via 6 is provided. In addition to the above, as the retaining member, for example, a groove may be cut on the outer periphery of the tip of the sub reference shaft 3 and a retaining ring may be fitted in the groove, or the outer periphery of the tip of the sub reference shaft 3 may be fitted. Alternatively, a pin insertion hole may be bored in and a stop pin may be inserted into the pin insertion hole.

The centering jig configured as described above is
It operates and is used as follows. That is, the sub reference shaft 3 is inserted into the taper hole 5a of the ring adapter 5 so that the tip projects outside the ring adapter 5, and the collar 6 is attached to the screw hole 3a at the tip so that the sub reference shaft 3 does not come out backward. Hexagonal bolt 7 is screwed in via the sub reference shaft 3 and ring adapter 5.
Combine with. Then, this combined body is fitted into the reference hole 4a of the welded work 4 until the collar 5c of the ring adapter 5 contacts the welded work 4. At this time, since there is a gap between the sub reference shaft 3 and the taper hole 5a of the ring adapter 5, the above-mentioned combined body can be easily fitted into the reference hole 4a of the welded product 4, whereby the welded product 4 Is smoothly centered, and the ring adapter 5 fitted in the reference hole 4a can firmly hold the welded product 4 during the welding operation. still,
After inserting the sub reference shaft 3 and the ring adapter 5 into the reference hole 4a of the welded product 4, the hexagon bolt 7 may be screwed into the screw hole 3a of the sub reference shaft 3 via the collar 6.

As described above, when the combined body is fitted into the reference hole 4a and the sub reference shaft 3 and the ring adapter 5 are aligned, the shoulder portion of the main reference shaft 2 and the ring adapter are aligned. 5 the gap h ₁ between the rear end face of the also gap h ₂ between the rear surface and the front end surface of the ring adapter 5 colors 6
By providing a gap h ₃ which is separated from the state in which only the sub reference shaft 3 is in contact with the tapered hole 5a of the ring adapter 5, as described later, the welding strain of the welded product 4 and the pressure applied by the clamp sub The reference shaft 3 is prevented from becoming difficult to come off from the ring adapter 5. Then, the welded product 4 is clamped on a jig (not shown).

When welding or the like is performed in this state and the main reference shaft 2 is pulled out after welding, the sub reference shaft 3 integral with it is pulled out backward. This is as shown in FIG.
Goes backward by a gap h ₂ between the front end face of the ring adapter 5 and the rear end face of the collar 6, the gap between the shoulder of the main reference shaft 2 and the rear end face of the ring adapter 5 becomes h ₁ + h ₂ ,
A gap h ₃ is formed between the sub reference shaft 3 and the taper hole 5a of the ring adapter 5, and the twist between the sub reference shaft 3 and the welded product 4 disappears. For example, there is no gap h ₂ as in the past,
If the rear end surface of the collar 6 and the ring adapter 5 are integrally provided, the sub reference shaft 3 cannot be pulled out due to a bend. Next, when the sub reference shaft 3 is pulled out as it is, the ring adapter 5 is caught by the collar 6 and pushed out, so that the ring adapter 5 can be easily pulled out from the reference hole 4a. After the removal, the sub-reference shaft 3 can be easily removed from the ring adapter 5 by releasing the engagement of the retaining member.

FIG. 3 shows a modified embodiment of the present invention in which a ring adapter 5 is provided with a recess 5d which is connected to the tapered hole 5a, and a collar 6 or a hexagon bolt is formed in the recess 5d. It is configured such that a retaining member such as 7 is housed, and a plate-shaped stopper 8 of the ring adapter 5 is vertically installed on a jig base 9. A hexagon bolt 7 is screwed into the screw hole 3a at the tip of the sub reference shaft 3 via the collar 6,
The sub reference shaft 3 and the ring adapter 5 are connected. Then, until the tip end surface of the ring adapter 5 contacts the plate-shaped stopper 8, the reference hole 4a of the welded product 4 is attached to this combined body.
The centering jig is inserted into the centering jig, and the other usages, functions and effects are the same as those of the centering jig shown in FIG.

FIG. 4 shows another embodiment of the centering jig according to the present invention, showing a so-called axis-based centering jig. A main reference shaft 2 as a centering shaft is inserted through a guide 1 of the jig, and the main reference shaft 2 is reciprocally movable in a horizontal direction in the drawing along a guide surface by a drive source (not shown). It is like this. A sub-reference shaft 3 having a predetermined taper is integrally provided at the tip of the main reference shaft 2 as a tapered shaft. The welded product 11 is
A reference shaft 12 is vertically provided at an appropriate position. A ring adapter 13 as an adapter is provided with a stepped reference hole 13a whose inner surface is in contact with the reference shaft 12 of the welded work 4 so that the ring adapter 13 can be inserted and removed freely. It is a stopper for positioning when it is fitted to. Further, a taper hole 13d which is further connected to the stepped hole 13b which is connected to the stepped reference hole 13a and which can fit only the tapered portion of the sub reference shaft 3 and does not contact the cylindrical portion is formed. The tip of the adapter 13 has a large chamfer 13e so that it can be easily fitted to the reference shaft 12.
Is given.

At the tip of the auxiliary reference shaft 3 reaching the stepped hole 13b, a retaining member is constructed as follows so as to be housed inside the stepped hole 13b. That is, the sub reference axis 3
A hexagonal bolt 7 is screwed into the screw hole 3a at the tip of the via a collar 6 to connect the sub reference shaft 3 and the ring adapter 13. Then, this combination is used as a ring adapter 1
The stepped portion 13c of No. 3 is fitted to the reference shaft 12 and centered until it contacts the tip of the reference shaft 12 of the welded workpiece 11. Since the centering jig of the present invention is constructed as described above, when the combined body is fitted to the reference shaft 12, the auxiliary reference shaft 3
Since there is a gap between the taper hole 13d of the ring adapter 13 and the ring adapter 13, it is possible to easily fit the above-mentioned combined body to the reference shaft 12 of the welded workpiece 11, and thereby the welded workpiece 11
The centering of can be done smoothly.

In this way, when the welded product 11 is centered with the sub reference shaft 3 and the ring adapter 13 fitted together, the shoulder portion of the main reference shaft 2 and the ring adapter 5 are the gap h ₁ between the rear end surface, also to have a gap h ₂ between the bottom of the stepped bore 13b of the rear end surface and ring adapter 5 colors 6, only the sub reference axis 3 ring adapter By providing the gap h ₃ away from the state of contact with the tapered hole 5a of No. 5, the auxiliary reference shaft 3 is less likely to come off from the ring adapter 13 due to the welding distortion of the welded workpiece 11 and the pressure applied by the clamp as described later. Prevent. Then, the welded product 11 is clamped (not shown) on the jig base 10.

In this state, when welding or the like is carried out, and after the working, the main reference shaft 2 is pulled out rearward, and the sub reference shaft 3 integral with it
Comes out backwards. This is also the same as in the case of the centering jig based on the above-mentioned axis reference. First, the sub-reference axis 3 first sets the gap h ₂ between the front end surface of the ring adapter 13 and the rear end surface of the collar 6.
When it goes backwards only, the gap between the shoulder of the main reference shaft 2 and the rear end surface of the ring adapter 13 becomes h ₁ + h ₂ , and a gap is created between the sub reference shaft 3 and the tapered hole 13d of the ring adapter 13. The twist between the sub reference shaft 3 and the welded workpiece 11 disappears. For example, if the rear end surface of the collar 6 and the ring adapter 13 are integrally provided without the gap h ₂ as in the conventional case, the sub reference shaft 3 cannot be pulled out due to a twist. Next, when the sub reference shaft 3 is pulled out as it is, the ring adapter 13 is pushed by the collar 6 and pushed out, so that the ring adapter 13 can be easily pulled out from the reference shaft 12. After the removal, the sub-reference shaft 3 can be easily removed from the ring adapter 13 by releasing the engagement of the retaining member.

[0021]

As described in detail above, the centering jig according to the present invention has a tapered shaft at the tip and is capable of reciprocating in the horizontal direction, and the outer periphery contacts the reference hole of the workpiece. Since it is composed of an adapter that can be freely fitted and removed and that can be fitted only to the tapered shaft, and a retaining member for the centering shaft, etc., a contactor that advances and retracts inside the centering member as in the conventional case is provided. The structure is simple and the work piece can be held stably, and even if the centering shaft and the reference hole of the work piece are misaligned, the work piece can be easily centered. Also, even if the centering shaft and the work piece are twisted due to clamps, welding distortion, etc., the adapter fits only on the taper shaft and the retaining member is provided separately from the adapter so that the centering shaft is provided. As a centering jig with good workability according to the hole reference, such as a tool that can be easily removed, its practical value is great.

Further, the centering jig according to the present invention comprises a centering shaft having a tapered shaft at its tip and capable of reciprocating in the horizontal direction,
An adapter that has a stepped reference hole at the tip part that can be freely inserted into and removed from the reference shaft of the workpiece and that can be fitted only into the tapered shaft,
It is composed of a retaining member for the centering shaft and the like, and the retaining member is provided so as to be separated from the adapter,
As a centering jig that has the same effect as the centering jig based on the hole and has good workability based on the axis, its practical value is great.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a centering jig according to the present invention.

FIG. 2 is an explanatory view of a state where the sub reference shaft of FIG. 1 is pulled out from a ring adapter.

FIG. 3 is an explanatory view showing a modified embodiment of the present invention.

FIG. 4 is an explanatory view showing another embodiment of the centering jig according to the present invention.

FIG. 5 is an explanatory view showing an example of a conventional centering structure for a welding jig.

FIG. 6 is an explanatory view showing an example of a conventional centering structure for a welding jig.

[Explanation of symbols]

1 ... Guide, 2 ... Main reference axis, 3 ... Sub reference axis, 3a
..Screw holes, 4 ... Welded workpieces, 4a ...
・ Ring adapter, 5a ・ ・ Tapered hole, 5b ・ ・ Chamfering, 5c ・ ・ Flange, 5d ・ ・ Concave, 6 ・ ・ Collar, 7 ・ ・
Hexagon bolt, 8 ... Plate stopper, 9, 10 ... Jig base, 11 ... Welded work piece, 12 ... Reference axis, 13 ...
・ Ring adapter, 13a ・ ・ Stepped reference hole, 13b
..Stepped holes, 13c ... Steps, 13d ... Tapered holes,
13e ... Chamfering

Claims (2)

[Scope of utility model registration request] 1. A guide body having a tapered shaft (3) at the tip.
Centering shaft (2) that can be inserted into (1) and reciprocally moved horizontally.
And an adapter that can be fitted and removed by contacting the outer periphery with the reference hole (4a) of the workpiece (4) and can be fitted only on the tapered shaft (3).
(5), the stopper (5c) for positioning the adapter (5) fitted in the reference hole (4a), and the detachment of the centering shaft (2) detachably formed at the tip of the tapered shaft (3). Stop member
(6, 7), the taper shaft (3) and the adapter
A centering jig, characterized in that the retaining member (6, 7) is provided in a state of being fitted with (5) with a space (h ₂ ) from the adapter (5). 2. A guide body having a tapered shaft (3) at the tip.
Centering shaft (2) that can be inserted into (1) and reciprocally moved horizontally.
And a tapered reference hole (13a) at the tip of which the inner surface contacts the reference shaft (12) of the workpiece (11) and can be freely inserted and removed.
Adapter (13) that can be fitted only to (3) and the reference shaft (1
Positioning stopper (1) for the adapter (13) fitted to (2)
3c) and a retaining member (6, 7) for the centering shaft (2) detachably formed at the tip of the taper shaft (3), the taper shaft (3) and the adapter (13) And the mating state of the retaining member (6, 7) with the adapter (13).
A centering jig characterized in that (h ₂ ) is provided separately.