JPS59196140A - Clamp zig - Google Patents

Abstract

PURPOSE:In a clamp zig for MC machine tool, to automate the clamping work of a workpiece by screwing a rotary shaft supported coaxially on a fixed shaft while provided with a clamp arm over the base section. CONSTITUTION:Upon forward rotation of a rotary shaft 9 supported by a fixed shaft 5 secured to the base section 2 through rotary drive section of a robot arm, the bolt head 12 will slide over the upper face of a clamp arm body 10 to fit balls 22a,... energized by a spring 23a into a recess 22 while the rotate the arm body 10 such that the contacting bolt 25 will come immediately above the workpiece and to stop through engagement with a projected chip 21. Upon screwing of a male screw section 13 into a screw hole 7 through rotation of the rotary shaft 9, said shaft 9 and clamp arm body 10 will lower against a spring 16 to clamp the workpiece 27 firmly. Consequently the clamping work of the workpiece can be automated.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to
The present invention relates to a clamping jig for clamping a workpiece to be processed.

[Technical background of the invention and its problems]

In automatic machine tools such as -1K1 and machining centers, a workpiece is clamped to a jig, placed on a table, and a predetermined process is performed on the clamped workpiece. Conventionally, in order to clamp a workpiece to a jig, manual clamping has been performed because the structure, shape, and dimensions of the workpiece vary in various ways. For example, a workpiece has been clamped with a jig such as a bolt using a T-groove formed in the jig. However, such manual clamping is time-consuming and labor-intensive, and is very inefficient, resulting in a decrease in machine operating efficiency.9 This also makes it difficult to automate the clamping work.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a clamping jig that enables automation of clamping work of a workpiece and has excellent versatility.

[Summary of the invention]

A fixed shaft is removably fixed to the base part, and a rotary shaft, which is movable in the axial direction and coaxially supported by the arm of the shaft, is screwed into the base part. The workpiece is clamped by the attached clamp arm.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a clamp jig (1) of this embodiment.

This clamp jig (1) is composed of a base part (2) made of a rectangular flat plate, and a clamp part (3) detachably attached to the upper surface of the base part (2). The base portion (2) is provided with a plurality of retaining holes (4), for example, in the shape of a base grid, as shown in FIGS. 2 and 3. This retaining hole (4) will be described later.

A large diameter hole (6) into which the fixed shaft (5) is inserted, and a large diameter hole (6) into which the fixed shaft (5) is inserted;
6) and coaxial with the screw hole (
It consists of power. Four recesses (8) are provided at the open end of the upper surface of the base portion (2) of the large-diameter hole (6) at equal intervals. On the other hand, the clamp part (3)
As shown in the figure, a cylindrical fixed shaft (5), a rotating shaft (9) coaxial with the fixed shaft (5) and slidably inserted in the axial direction, and an upper end of the rotating shaft (9). It consists of a clamp arm body αQ attached to the part. The fixed shaft (5) has four convex portions I that fit into the concave portions in the middle of the lower end side of the outer circumferential surface of the fixed shaft (5).
... are evenly distributed and curved. In addition, the rotation axis (9)
The hexagonal bolt heads α are connected to the upper end, and the lower end has a male thread (2) that is threaded into the screw hole (7). There is. An annular locking body 04) is mounted on the outer peripheral surface of the rotating shaft (9) close to the male threaded portion (13). Furthermore, the upper end of the fixed shaft (9) has a small diameter on the outer circumferential side, and has a stepped portion (1).
5) is formed, and a compression coil spring α0 is wound around this stepped portion (15). This compression coil spring (16) integrally connects the clamp arm body (10) and the rotating shaft (9) which is secured to the clamp arm body α0 by the bolt head (121) in the direction of the arrow (17a). Furthermore, a positioning body α second is fixedly attached to the upper end of the fixed shaft (5) (see Fig. 5). , an arc-shaped support part (1) with a middle u angle of 120 degrees attached to the outer peripheral surface of the fixed shaft (5), and first and second standing parts (20a) and (20b).The lower end of the back side of the clamp arm QO) has a
Protrusion piece (21) 75E is provided in a protruding manner. This protrusion (21
) are the first and second standing parts (20a), (20
By being locked by b), the rip arm body (10
) is intended to regulate the amount of rotation. However, there are four semi-spherical pieces on the bottom side of the bolt head. Recessed part (
22)... are arranged equally. At the upper surface position of the clamp arm body [0] corresponding to each of these recesses (2...), there is a compression coil spring (23a) stored in the storage recess (23j... Forced sphere (
22a)... are held so as to be freely projectable and retractable from the upper surface of the clamp arm body 00). Thus, the positioning body, the protrusion (21
), the recessed portion (22... and the sphere (22a)...) are
It constitutes a swing mechanism (24). Further, the clamp arm body (10) is an arm-shaped body installed horizontally in a direction perpendicular to the axis of the rotating shaft (9), and has an abutment pole (25) A: screwed on the lower surface side of the tip. has been done. This contact bolt (2
The head (a) of 5) directly contacts the workpiece (27) and fixes the workpiece (2). In addition, a nut (C) screwed onto the abutment bolt (C) is inserted between this head and the lower surface of the clamp arm body α0), and the rotation of this nut causes the workpiece to be machined. The amount of protrusion of the abutment bolt (to) can be adjusted as appropriate depending on the height of the object (27). Furthermore, FIG. 6 is a cross-sectional view taken along line A-A in FIG. ) will be described later.) (30) Tightening/loosening mechanism 01)
It can be held by a grip C321 that holds a part of it.

Next, the operation of the clamp jig (1) having the above configuration will be described. First, the base portion (2) is placed on a predetermined position on the setup table □□□ using a not-shown positioning pin by a transport device (not shown). A jig table (not shown) is installed adjacent to this setup table (c). On this jig table, clamp parts (3) of various sizes depending on the size and shape of the workpiece (5) are arranged at predetermined positions. A second assembly robot (not shown) is installed between the jig table and the setup table (to),
The required clamp parts (3)... are transferred between the jig table and the setup table 03).

After the workpiece (27) is placed in a predetermined position on the base part (2) by the transfer device, the second assembly robot moves the hPIT-required clamp part to the base part (2), as shown in FIG. (3) Attach... to the specified position on the base part (2).

That is, the lower end of the fixed shaft (5; Connect the fixed shaft (5) to the base part (
2). At this time, the protruding piece Cυ of the clamp arm body (10) should be set so that it is at the person's position in Fig. 5, and the tab and contact bolt (2G+) are not located directly above the workpiece (2η). Next, the workpiece (27) is clamped by the first assembly robot (30), which is installed adjacent to the setup table.
The first assembled robot consists of a main body (35) and an arm part (35) that is attached to the main body 0ω and is movable within a predetermined range.
2) The rotating shaft (
9) Tightening and loosening mechanism 01 for attaching and detaching work to the base part (2)
It consists of 1. This tightening/loosening machine (mC3) includes the grip G2 and a rotation drive unit (torque) that is attached to the front surface of the upper end of this grip (321) and engages with one bolt head to rotate the rotating shaft (9) in forward and reverse directions. ).The arm part (36) is then moved to engage the rotary drive part (g) with the bolt head (I), and the grip (36) is moved.
2) Clamping surface (2c+a) of fixed shaft (5), (2
9b) Arrow (1)
7b), and then starts the rotational drive unit G36) to rotate the rotating shaft (9) in the normal direction. Then, the bolt head Q
2+ rotates while sliding on the upper surface of the clamp arm (10). Then, when the sphere (22a), which is biased by the compression coil spring (23a), fits into the recess, the rotation shaft (9) and the clamp arm body α0) are aligned. The clamp arm body α0) is connected to the inside of the body, and as shown in FIG. It rotates following the rotation axis (9) until it does. When the protruding piece (21) is engaged with the upright part (20b), the rotation of the clamp arm αQ stops when the rim abutment bolt (c) comes directly above the workpiece (2?). do. However, the rotating shaft (9) continues to rotate against the biasing force of the compression coil spring (23a). Then, as the male threaded portion (13) screws, the screw hole (when assembled into the sword, the rotating shaft (9) and the clamp arm body 00) connects with the arrow (17b).
) direction, against the biasing force of the compression coil spring u6). Thus, as the clamp arm α0) descends, the contact pole (25+) comes into contact with the workpiece θ and firmly clamps the workpiece (sha), and the rotary drive unit (3t3) The operation is stopped to stop the rotation of the rotating shaft (9), and the lowering of the tightening/loosening mechanism 01) is also stopped. Next, the setup table (to)) is rotated, and the other clamp part (3) that is not clamping the workpiece f27) is rotated.
)..., the second assembly robot (30) performs white-like clamping work. However, the workpiece (2η
The clamping jig (1) that has clamped the workpiece (27) is mounted on a machining center by a conveying means (not shown), and the workpiece (27) is
Perform the specified machining process on the And after finishing the processing,
Return the clamping jig (1) that clamps the processed workpiece (27j) to the setup table (2), and place it on the first
The cyan clamping work is performed by the assembly robot (to).

That is, after engaging the rotation drive part (36) with the bolt head (12) in the same manner as before, the rotation shaft (9) is moved while gradually raising the tightening/loosening mechanism 01) in the direction of the arrow (17). Then, the screw hole of the male thread part α (towards) (the rotation axis (9) will be removed due to the screw movement during force).

The lamp arm body (101) and the lamp arm body (101) rise together in the direction of the arrow (17a).Then, the male threaded portion (13) separates from the screw hole (force), and the workpiece (27) is unclamped.

The rotating shaft (9) then rises until the locking body (14) locks on the fixed shaft (5) due to the biasing force of the compression coil spring ([6). On the other hand, as the rotating shaft (9) rotates, the spheres (22a) fit into the recesses (22) again, and the clamp arm ao) follows the rotating shaft (9).
As shown in FIG. 5, it rotates in the direction of the arrow (37b) from the B position to the A position until the bar protrusion (21) is engaged with the upright portion (20a).

When the projection (2) is engaged with the upright portion (20a), the rotation of the rotating shaft (9) is stopped and the unclamping operation is completed.

Thus, similar unclamping work can be performed on other clamp parts (3
)... will also be performed.

In this way, the glue 2-pump jig (1) of this embodiment has a fixed shaft (5 ) is inserted into the retaining hole (4) at a desired position, and the rotating shaft (9) is screwed onto the base portion (2). Therefore, it is possible to clamp and unclamp the workpiece reliably, quickly, and easily, and it has excellent flexibility as a clamping jig that can be quickly applied to workpieces of various shapes and sizes. Moreover, compared to clamping methods using fluid pressure, there is no drop in clamping pressure due to fluid leakage, etc.
Since it does not require accessories such as hoses, it has excellent transportability, workability and safety, and has the advantage of being able to be transported to any location while maintaining a constant clamping force.

Note that FIG. 7 shows a clamping jig according to another embodiment (in this figure, the same parts as in the above embodiment are designated by the same reference numerals). This clamp jig has a central axis as a fixed axis (40), and an outer peripheral axis as a rotating axis (4I) for clamping the workpiece (27). The compression coil wound around the spring (
It is supported slidably in the axial direction by the cage. and,
The lower end of the fixed shaft (4Q is formed into a hexagonal shape and the base part (2
) The fixing hole (4) on the bottom side is inserted into the fixing hole (4).The top side of the base part (2) is provided with a female screw hole (44) coaxial with the fixing hole (4■), and the rotation axis (41) The male thread carved on the outer circumferential surface of the lower end is screwed into the bolt head (41).
5) The rotation axis (4υ
The contact bolt (2 (G)) clamps the workpiece (material) as the clamp arm body α
0) is rotatably attached between the locking body (4G+) ring-mounted on the rotating shaft (4υ) and the bolt head (49), and is rotated by the same swing mechanism as in the above embodiment. This embodiment also has the same effects as the above embodiment.

Furthermore, as shown in Fig. 8, a screw hole (a cylindrical hollow hole (47) on the bottom side of the base part (2) for the purpose of force) is embedded rotatably and coaxially with the locking hole (4). , this nut (4
By burying γj rotatably and coaxially with the locking hole (4), and inserting a nut runner into the fitting part (48) of this oak) (47) and rotating it, this oak) ( 47)
The rotation shaft (9) may be screwed into the base portion (9), and the pick rotation shaft (9) may be attached to and removed from the base portion (2). Also,
The swing mechanism (c) is not limited to the above embodiment. For example, the positioning body (18) is provided with a swing groove and the protruding piece (2) is used as a guide ``''7.
engaged in the groove.

Then, as the rotating shaft (9) moves up and down, the clamp arm body 0
0) may be made to swing. Or, conversely, a swing groove may be provided on the back surface of the clamp arm body 00), and the guide screw □ attached to the fixed shaft (5) may be engaged with this swing groove to cause the clamp arm body 00) to swing. ), a coaxial intermediate hollow shaft is provided between the rotating shaft (9) and the fixed shaft (5), a clamp arm body (10) is fixed to the upper end, and a swing groove is provided in the middle part of the hollow shaft; Groove in Fixed Shaft (5) [Effect of the Invention] The clamping jig of the present invention has the advantage of being able to clamp and unclamp a workpiece quickly, reliably, and easily. Moreover, since clamp parts of various sizes can be attached and detached at arbitrary positions, the machine has excellent flexibility to clamp the workpiece in response to changes in the size and shape of the workpiece. Furthermore, compared to clamping methods that use fluid pressure, there is no drop in clamping pressure due to fluid leaks, and there is no need for hoses or other accessories associated with fluid use, which improves transportability, workability, and safety. Excellent. therefore,
The present invention is based on an FMS (Fle) that controls a group of automatic machine tools.
xible Manufacturing System
It is highly suitable for m).

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall configuration of a clamping jig according to an embodiment of the present invention, FIGS. 2 and 3 are a plan view and a sectional view showing the structure of the retaining hole, respectively, and FIG. 4 is a clamping part. 5 is a plan view of the clamp arm body, FIG. 6 is a cross-sectional view of the fixed shaft, and FIGS. 7 and 8 are sectional views of essential parts showing other embodiments of the present invention. It is. (2) Two base parts, (4) : Engagement hole. (5): Fixed shaft, (6): Screw hole (female thread part)
. (9): Rotation axis, Cl0): Clamp arm body. (13) : Male thread part, (24) : Swing mechanism. 'Scheme 1 Illustration ゝ'〆 3 Artwork 4 Illustration T 7 Illustration

Claims (1)

[Claims] A plate-shaped base portion having a mounting surface on which a workpiece is mounted and in which engaging holes, some of which are female threaded, are bored at multiple positions on the mounting surface, and the above-mentioned engaging hole. A fixed shaft that is removably fixed to a part other than the female threaded part of the matching hole, and a fixed shaft that is coaxially supported by the fixed shaft so that it can move forward and backward in the axial direction and can rotate freely around the shaft, and has a threaded part at one end. A rotating shaft is formed, and the male threaded portion is screwed into the female threaded portion by rotational drive from the outside, and the workpiece is rotatably supported by the rotating shaft and advances and retreats integrally with the rotating shaft. 1. A clamp jig comprising: a clamp arm for clamping; and a swing mechanism for rotating the clamp arm in forward and reverse directions as the rotating shaft advances and retreats.