JPH07100719A - Workpiece mounting jig - Google Patents

Abstract

PURPOSE:To provide a workpiece mounting jig capable of improving working accuracy in the workpiece mounting jig constituted to fixedly hold the workpiece between a fixed plate and movable plate approaching and separating from each other. CONSTITUTION:A workpiece mounting jig 1 is provided with a fixed plate 10 having a clamp block 12 as a reference seat abutting against a cylinder block W and a center block 13 as a reference pin fitted in the cylinder block W and a movable plate 20 for mounting the cylinder block W thereon while being provided to move along the direction of approaching and separating from the fixed plate 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work mounting jig for holding a work in a predetermined work posture.

[0002]

2. Description of the Related Art For example, when machining a mounting hole in a cylinder block of a two-cycle engine, a cylinder block B placed on a fixing jig plate A as shown in FIG. After fixing to A, drill E provided on blanking plate D,
By lowering E, the cylinder block B
The completed cylinder block B, which has a mounting hole formed therein, and which has completed the drilling process, is ejected from the fixing jig plate A by the ejector F provided so as to be retractable from the fixing jig plate A. The Rukoto.

[0003]

By the way, in the work mounting jig having the above-described structure, when the cylinder block B is pressed against the fixing jig plate A by the clampers C, C, the cylinder block B tilts. However, there is a problem in that the machining accuracy of the drills E, E is not stable. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a work attachment jig capable of achieving improvement in machining accuracy. Further, in the above-described conventional work mounting jig, since the ejector F is moved in and out of the fixing jig plate A in order to project the cylinder block B from the fixing jig plate A, the ejection of the work is complicated. There was an inconvenience that required a mechanism. The present invention has been made in view of the above circumstances, and an object thereof is to provide a work mounting jig capable of projecting a work without requiring a complicated mechanism.

[0004]

A work mounting jig according to the present invention mounts a work and a fixed plate that has a reference seat that abuts on the work and a reference pin that fits the work and that is fixedly installed. In addition, the movable plate is provided so as to be movable along the approaching / separating direction with respect to the fixed plate. Further, in the work mounting jig according to the present invention, the work ejector is fixedly installed in a manner that the relative position does not change with respect to the fixed plate.

[0005]

Since the fixed plate is provided with the reference seat and the reference pin, when the work is held between the movable plate and the movable plate, the work is maintained in a predetermined posture by the reference seat and the inclination of the work is determined by the reference pin. Will be corrected by. Also, because the work ejector is installed immovably with respect to the fixed plate, when the movable plate moves in the direction away from the fixed plate, the work ejector moves relative to the movable plate, and the work projects from the movable plate. Will be done.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing one embodiment. 1 to 4 show an example in which a work mounting jig according to the present invention is applied to a jig used in a process of machining a mounting hole in a cylinder block in a production facility for a two-cycle engine mounted on a motorcycle. Is shown.

The work mounting jig 1 uses a cylinder block W having a shape as shown in FIG. 5 as a workpiece to be machined, and has a plurality of mounting holes Wb arranged on the upper end surface of the cylinder block W so as to surround the bore Wa. Used to form Wb ...

The work mounting jig 1 is shown in FIGS.
As shown in FIG. 3, the fixed plate 10 and the movable plate 20 are provided. The fixed plate 10 is fixedly installed on a base (not shown), while the movable plate 2 is fixed.
0 moves up and down along the elevating guide posts 11, 11 ... Provided at the four corners of the fixed plate 10 by appropriate driving means (not shown), in other words, moves in a manner of approaching and separating from the fixed plate 10. To do.

Further, a clamp block 12 as a reference seat and a center block 13 as a reference pin are both attached to the fixed plate 10 via a bush plate 14, and the center block 13 is shown in FIG. When the cylinder block (work) W is held as shown in 1, the bore W of the cylinder block W is
It is provided at a position where it penetrates into a.

On the other hand, five clamp blocks 12 are provided so as to abut the upper end surface of the cylinder block W so as to surround the center block 13 as shown in FIG. The lower end surface in ..., That is, the surface that contacts the upper end surface (cylinder head mounting surface) of the cylinder block W is set to be located on the same horizontal plane.

Further, as shown in FIGS. 2 and 3, a drill 16 penetrates through the bush plate 14 via a drill bush 15, and the drill bush 1
5 and the drill 16 are similar to the above-mentioned clamp blocks 12, 12, ... As shown in FIG.
Five sets are arranged so as to surround 3.

Reference numeral 14a in FIGS. 2 and 3 is a handle provided on the bush plate 14, and FIG.
Reference numeral 17 indicates a fixed plate 10 and a bush plate 1
4 shows a removable positioning pin when attaching No. 4.

On the other hand, a positioning sleeve 21 is attached to the movable plate 20 via a jig plate 22, and the skirt portion Wc of the cylinder block W is inserted into the positioning sleeve 21 as shown in FIG. As a result, the cylinder block W is set on the movable plate 20.

As shown in FIGS. 2 and 4, the jig plate 22 is provided with a positioning pin 23. The positioning pin 23 is vertically movable via a spring, and the cylinder block By engaging with a knock pin hole (not shown) in W, the cylinder block W is positioned in the rotational direction.

Further, as shown in FIG. 1, the movable plate 20 and the jig plate 22 are provided with a positioning sleeve 21.
The work ejector 24 is loosely fitted in such a manner as to face. The work ejector 24 is, for example, the fixed plate 1 described above.
No. 0 and a base (not shown), so that the relative position with respect to the fixed plate 10 does not change. The work ejector 24
Is configured so that position adjustment in the vertical direction can be performed by an adjuster (not shown).

2 and 4, reference numeral 22a is a handle of the jig plate 22, and reference numerals 25 and 26 in FIGS. 1 and 4 are rough guide pins for guiding the cylinder block W and a movable plate. Jig plate 2 on 20
2 shows a detachable positioning pin when attaching 2.
Further, both the bush plate 14 and the jig plate 22 described above can be appropriately replaced according to the type of the cylinder block W.

When the cylinder block W is fixedly held in the work mounting jig 1 having the above-described structure, first, the skirt portion Wc of the cylinder block W is set in the positioning sleeve 21 provided on the movable plate 20. After that, the movable plate 20 is moved upward by a driving means (not shown).

As the movable plate 20 moves upward, the plurality of clamp blocks 12, 12 ... Provided on the fixed plate 10 and the upper end surface of the cylinder block W abut each other, whereby the movable plate 20 moves. When the upward movement is stopped, the upper end surface of the cylinder block W is positioned in a predetermined posture.

Further, as the movable plate 20 moves upward,
The center block 13 provided as a reference pin on the fixed plate 10 is a bore 13a of the cylinder block W.
The center of the bore in the cylinder block W is accurately positioned by penetrating into the cylinder block.

Further, even when the cylinder block W is slightly inclined, the center block 13 is inserted into the bore 13a of the cylinder block W as the movable plate 20 moves upward, whereby the cylinder block W is moved. The above-mentioned clamp block 1 in which the inclination of W is corrected
The cylinder block W is positioned in a predetermined posture by the functions of the center blocks 13, 2.

As described above, the cylinder block W is fixedly held by the work mounting jig 1, the holes are drilled in the cylinder block W by the drills 16, 16 ... And then the movable plate 20 is lowered. The fixed plate 10 and the movable plate 20 are separated from each other, and the clamp for the cylinder block W is released.

When the movable plate 20 is further lowered, the work ejector 24 is provided such that the relative position thereof does not change with respect to the fixed plate 10 as described above.
Of the cylinder block W mounted on the positioning sleeve 21 of the movable plate 20.
Will be projected from the positioning sleeve 21 and taken out from the workpiece mounting jig 1.

Here, the projecting operation of the cylinder block W by the work ejector 24 does not require a dedicated drive means as described above, but the vertical movement of the movable plate 20 for holding and releasing the work. It is carried out based on the above, and the structure itself is extremely simple.

The work mounting jig according to the present invention is
Effective not only in the jig used for machining the mounting holes in the cylinder block in the production facility of the two-cycle engine shown in the embodiment, but also in the workpiece mounting jig used in performing various machining on various workpieces. It goes without saying that it can be applied to.

[0025]

As described above in detail, in the work mounting jig according to the present invention, the fixed plate having the reference seat abutting against the work and the reference pin fitted to the work and fixedly installed, and the work And a movable plate that is movable along the direction of approaching and separating from the fixed plate. While the posture is maintained, the inclination of the work is corrected by the reference pin, so that the working accuracy of the work can be significantly improved.
Further, in the work mounting jig according to the present invention, since the work ejector is fixedly installed in such a manner that the relative position does not change with respect to the fixed plate, when the movable plate moves in the direction away from the fixed plate, By the relative movement of the work ejector with respect to the movable plate, the work is ejected from the movable plate, so that the work can be ejected without requiring a complicated mechanism.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a work mounting jig according to the present invention.

FIG. 2 is a sectional side view showing a work mounting jig according to the present invention.

FIG. 3 is a bottom view showing a bush plate of the work mounting jig according to the present invention.

FIG. 4 is a plan view showing a movable plate and a jig plate of a work mounting jig according to the present invention.

FIG. 5 is an overall plan view showing a cylinder block as a work.

FIG. 6 is an overall view conceptually showing a conventional work attachment jig.

[Explanation of symbols]

 1 ... Work mounting jig 10 ... Fixed plate, 12 ... Clamp block (reference seat), 13 ... Center block (reference pin), 14 ... Bush plate, 20 ... Movable plate, 21 ... Positioning sleeve, 22 ... Jig plate, 23 ... Positioning pin, 24 ... Work ejector, W ... Cylinder block (work), Wa ... Boa, Wb ... Mounting hole, Wc ... Skirt part.

Claims (2)

[Claims] 1. A work attachment jig configured to fix and hold a work between a fixed plate and a movable plate that move toward and away from each other, and a reference seat that abuts on the work, and a fitting to the work. A fixed plate that has a matching reference pin and that is fixedly installed; and a movable plate that is mounted so that the work is placed and that is movable along a direction that approaches and separates from the fixed plate, A workpiece mounting jig comprising: 2. When the movable plate is immovably installed in a manner such that its relative position does not change with respect to the fixed plate, and when the movable plate moves in a direction away from the fixed plate, the movable plate moves relative to the movable plate. The work mounting jig according to claim 1, further comprising a work ejector that projects the work from the movable plate.