JP2546425Y2 - Workpiece fixing device for machine tools - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workpiece fixing device for a machine tool, which enables easy positioning of a workpiece and enables the entire processing of the workpiece without exchanging the apparatus.

[0002]

2. Description of the Related Art As a workpiece fixing device for a machine tool for cutting a long material such as an aircraft girder, a jig body provided with an engagement piece on a lower surface and a hole into which the engagement piece is loosely fitted are provided. A jig body supporting plate provided on the surface and having a positioning flange protruding on the side surface, and the T-type work is fixed using the inclined surfaces provided at both ends of the bottom of the T-type work. For example, it is disclosed in Japanese Utility Model Publication No. 59-24429.

[0003]

The work piece fixing device of the above-mentioned type of machine tool is configured to be applied to a T-shaped cross section. Without changing the configuration, for example, the present invention can be similarly applied to an I-shaped section material such as an aircraft wing stringer.
In the case of cutting an I-shaped cross section by incorporating it into a vertical milling machine, separately prepare a work fixing jig dedicated to the relevant section in order to support both sides of the I-shaped cross section with an end mill. Each time both sides are cut, it must be replaced with a specially prepared work fixing jig, which makes the work process complicated and troublesome. The present invention has been made in view of the above points, and facilitates the positioning of a workpiece, and enables the entire processing of the workpiece without separately preparing a dedicated work fixing jig. It is an object to provide a material fixing device.

[0004]

According to the present invention, there is provided a workpiece fixing device for a machine tool, comprising a table fixedly provided on both sides of a support plate with support brackets provided at both ends thereof, and a support bracket provided at both ends of the table. A rotary table rotatably supported, a positioning device for fixing the rotary table to the support bracket at a plurality of positions in the rotation direction, a fixed block fixed to one side of the upper surface of the rotary table, and a face facing the fixed block. A movable block arranged on one side of the upper surface of the rotary table so as to be slidable in the width direction of the rotary table, and a lower flange of the I-shaped workpiece is fitted to the upper inside of the fixed block and the movable block. An upper groove and a lower groove in which an upper flange of the workpiece is loosely fitted are provided in an inner lower portion, and the inner end faces of the fixed block and the moving block are formed by an I-shaped workpiece web. Configured so as to sandwich part.

[0005]

In the work material fixing device of the machine tool according to the present invention, I
Upper surface cutting of the upper flange of the I-type workpiece, which is performed by fitting the lower flange of the die workpiece into the fixed block of the rotary table disposed in the horizontal position and the upper groove provided on the upper inside of the moving block. By rotating the rotary table to a vertical position by the positioning device, the upper surface of the lower flange of the I-shaped workpiece, the side surface of the web portion and the lower surface of the upper flange are cut, and the inner end surfaces of the fixed block and the moving block are formed. The lower surface cutting of the lower flange of the I-shaped workpiece performed by sandwiching the web portion of the I-shaped workpiece is performed by one fixing device without replacing the fixing device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a surface plate of a vertical milling machine, on which a table 2 is fixed.
At both ends of the table 2, supporting brackets 4, 4 for supporting the rotary table 3 are provided upright. The support fitting 4 has a shaft hole 5 for supporting the shaft portion 3a of the rotary table 3 and a positioning hole 6 at a position above a vertical line passing through the center O of the shaft hole 5. In the end face of the rotary table 3, the positioning hole 6 centered on the axis O of the shaft portion 3a is provided.
The three positioning holes 7, 8, 9 are formed on concentric circles corresponding to. The positions where these three positioning holes 7, 8, 9 are formed are positioning holes 7 and 9 located in a horizontal plane passing through the center O when the rotary table 3 is horizontally arranged with respect to the table 2, and vertically upward. The positioning hole 8 is located at the position shown in FIG. That is, the rotary table 3 keeps a horizontal position with respect to the table 2 by aligning the positioning holes 8 with the positioning holes 6 and inserting the positioning pins 10 into the positioning holes 8 through the positioning holes 6 of the support fitting 4. The positioning hole 7 is aligned with the positioning hole 6, and the positioning pin 10 is inserted into the positioning hole 7 through the positioning hole 6 provided in the support bracket 4, so that the positioning pin 10 is rotated 90 degrees counterclockwise with respect to the horizontal position. And the positioning hole 9 is aligned with the positioning hole 6 so that the positioning pin 10
Is inserted into the positioning hole 9 through the positioning hole 6 provided in the support fitting 4 so that the horizontal
Maintain the rotated position.

On the other hand, on one side of the upper surface of the rotary table 3, a fixed block 11 extending along the longitudinal direction is formed integrally with the rotary table 3, and
On the other side, facing the fixed block 11,
A moving block 12 extending along the longitudinal direction is arranged. The fixed block 11 and the moving block 12 constitute a clamping mechanism for the workpiece 13 having an I-shaped cross section. That is, the claw portion 14 that forms the upper groove into which the lower flange 13a of the workpiece 13 provided on the upper inside of the fixed block 11 is fitted, and the support surface 15 that supports the lower surface of the workpiece 13 are moved as described above. The work piece 13 cooperates with a claw portion 16 that forms an upper groove into which the lower flange 13a of the work material 13 provided on the inner side of the block 12 is fitted, and a support surface 17 that supports the lower surface of the work material 13. To form a lower flange clamp. The support surface 15 and the support surface 17
Are located in the same horizontal plane and cooperate to constitute a workpiece reference plane A. The inner end face 11a of the fixed block 11 and the inner end face 12a of the movable block 12 cooperate to form the workpiece 1
A holding portion for holding the third web portion 13b is formed. Further, a lower groove 1 into which the upper flange 13c of the workpiece 13 is loosely fitted is formed in the lower portion inside the fixed block 11.
8 is formed, and the lower part inside the moving block is similarly formed.
A lower groove 19 into which the upper flange 13c of the workpiece 13 is loosely fitted is formed, and the lower groove 18 and the lower groove 19 are
The work fixing space 20 is configured in cooperation. The upper surface 21 of the rotary table 3 forming the bottom surface of the work fixing space 20 forms a work reference plane B.

On the other hand, a mounting portion 22 projecting downward from the lower surface of the moving block 12 extends to a space 23 provided in the rotary table 3. A hydraulic cylinder 24 is provided horizontally in the space 23, and a piston rod 25 of the hydraulic cylinder 24 is pivotally attached to a mounting portion 22 extending to the space 23 via a pin 26. That is, the moving block 12 slides the upper surface of the rotary table 3 in the width direction of the rotary table 3 by moving the piston rod 25 of the hydraulic cylinder 24 in the reciprocating direction.

Next, the operation will be described. Prior to cutting the workpiece 13 having the I-shaped cross section, the rotary table 3 is inserted into the positioning hole 8 of the rotary table 3 through the positioning hole 6 of the support bracket 4 by inserting the positioning pin 10 into the rotary table 3. The horizontal position is set with respect to the table 2 shown in FIG. Next, the piston rod 25 of the hydraulic cylinder 24 of the workpiece fixing device is operated in the protruding direction as shown in FIG. 4, and the movable block 12 provided on the upper surface of the rotary table 3 is moved to the claw portion 14 of the fixed block 11. The movable block 12 is separated from the fixed block 11 so that the distance between the movable block 12 and the claw portion 16 is larger than the length of the lower flange 13 a of the workpiece 13. Then, the workpiece 13 to be cut is placed directly above the fixed block 11 and the movable block 12 with the lower flange 13a facing downward.

Next, the workpiece 13 is lowered, the workpiece 13 is placed on the work reference plane A shown in FIG. 5, and the piston rod 25 of the hydraulic cylinder 24 is operated in the returning direction to move the moving block 12. Of the workpiece 1 by sliding the upper surface of the rotary table 3 toward the fixed block 11.
3, the lower flange 13a is held between the claw portion 14 of the fixed block 11 and the claw portion 16 of the movable block 12.
In this state, the work material 13 is tightened while being pressed downward by the claw portion 14 of the fixed block 11 and the claw portion 16 of the movable block 12, so that the work material 13 is pressed against the work reference plane A, In addition, by forming the fixed block 11 integrally with the rotary table 3, a floating force does not act on the fixed block 11, and the floating force accompanying the sliding of the movable block 12 is suppressed. When the lower flange 13a of the workpiece 13 is fixed by the fixed block 11 and the moving block 12, the cutter of the vertical milling machine is operated to set the initial position 27 of the upper surface of the upper flange 13a of the workpiece 13 by a two-dot chain line. To a predetermined cutting surface position 28.

When the cutting of the upper flange 13a of the workpiece 13 to the predetermined cutting surface 28 is completed, the rotary table 3 is moved around the shaft 3a by a hydraulic device (not shown) as shown in FIG. Is rotated counterclockwise by 90 degrees, and the positioning pin 10 is inserted into the positioning hole 7 of the rotary table 3 through the positioning hole 6 of the support fitting 4 so that the rotary table 3
Maintain a vertical position with respect to. When the position of the rotary table 3 is determined, the cutter of the vertical milling machine is operated, and the right upper surface of the lower flange 13a, the right side surface of the web portion 13b, and the upper flange 13c of the workpiece 13 are processed.
Is cut from the initial position 29 indicated by a two-dot chain line to a predetermined cutting surface position indicated by 30. In this case, since the hydraulic cylinder 24 and the piston rod 25 are built in the rotary table 3, the space required for rotating the rotary table 3 can be reduced.

The upper surface of the lower flange 13a of the workpiece 13, the right side surface of the web portion 13b, and the upper flange 13c
When the cutting process to the predetermined cutting surface position 30 on the lower surface of the rotary table 3 is completed, the rotary table 3 is turned 180 degrees clockwise by a hydraulic device (not shown) as shown in FIG. By rotating the rotary table 3 in the direction, the positioning pin 10 is inserted into the positioning hole 9 of the rotary table 3 through the positioning hole 6 of the support bracket 4 so that the rotary table 3 is maintained at a vertical position with respect to the table 2. Position. When the position of the rotary table 3 is determined, the cutter of the vertical milling machine is operated, and the left upper surface of the lower flange 13a of the workpiece 13 and the web portion 13b
And the left lower surface of the upper flange 13c is cut to a predetermined cutting surface position indicated by an initial position 31 to 32 indicated by a two-dot chain line.

The lower flange 13a of the workpiece 13
When the cutting process to the predetermined cutting surface on the lower surface of the web portion 13b and the upper flange 13c is completed, the rotary table 3 is rotated counterclockwise by 90 degrees by a hydraulic device (not shown), and the positioning pin 10 is positioned by the support bracket 4. Hole 6
By inserting the rotary table 3 into the positioning hole 6 of the rotary table 3 via the through hole, the rotary table 3 is positioned so as to maintain a horizontal position with respect to the table 2. As a result, all surfaces of the workpiece 13 except for the lower surface of the lower flange 13a are cut.

Next, as shown in FIG. 8, the moving block 12 is operated in the direction in which the piston rod 25 of the hydraulic cylinder 24 is protruded, and the distance between the end face of the fixed block 11 and the end face of the moving block 12 is increased. The workpiece 13 is separated from the fixed block 11 so as to be wider than the length of the upper flange 13c. As a result, the work member 13 is released from being tightened by the claw portion 14 of the fixed block 11 and the claw portion 16 of the movable block 12, so that the work material 13 is removed from the rotary table 3, and the removed work material 13 is removed.
, The upper flange 13 is placed on the rotary table 3 with the upper flange 13 facing downward, and the upper surface of the upper flange 13 is positioned on the work reference plane B of the work fixing space 20, as shown in FIG. When the workpiece 13 is located at a predetermined position, the piston rod 25 of the hydraulic cylinder 24 is operated in the returning direction, and the both side faces of the web portion 13b of the workpiece 13 are brought into contact with the end face 11a of the fixed block 11 and the end face of the moving block 12. 12a. Web portion 13b of workpiece 13
Is completed, the cutter of the vertical milling machine is operated to lower the lower surface of the lower flange 13a of the workpiece 13 by 2 mm.
Cutting is performed from an initial position 33 indicated by a chain line to a predetermined cutting surface 34. In this case, the web portion 13b of the workpiece 13
Is cut by the above cutting process so as to be narrower than the initial width.
Is located inside the end face of the rotary table 3 by a distance L, so that the lifting force of the moving block 12 is suppressed by the pin 26 pivotally connecting the piston rod 25 of the hydraulic cylinder 24 and the mounting portion. Since the moving block 12 is in close contact with the upper surface of the rotary table 3, the web portion 13b of the workpiece 13 can be securely held.

When the lower surface of the lower flange 13a of the workpiece 13 has been cut, the moving block 12 is moved to the position shown in FIG.
As shown in FIG.
Is operated in the protruding direction, the moving block 12 is slid in the direction away from the fixed block 11, and the workpiece 13 that has been cut is removed from the rotary table 3.

FIG. 11 shows another embodiment of the present invention. In this embodiment, the fixed block 40 is separate from the rotary table 3 and the fixed block 40 is fixed to the rotary table 3 by fixing means 41 such as screws. At the same time, a dovetail groove 42 extending in the width direction is provided on the rotary table 3, and the convex portion 4 having a cross section corresponding to the dovetail groove 42 provided on the moving block 43.
4 is engaged with the dovetail groove 42 and the moving block 43
Are made to slide in the width direction of the rotary table 3 without generating a floating force.

[0017]

As described above, according to the present invention, the entire surface of the workpiece having the I-shaped cross section can be processed without replacing the fixing device, and the positioning operation of the workpiece is simple. This has the effect that even inexperienced workers can easily and accurately position the workpiece.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a workpiece fixing device of a machine tool according to the present invention.

FIG. 2 is a plan view of a clamp portion.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a diagram showing a state before a workpiece is attached.

FIG. 5 is a diagram showing a state in which a lower flange of a workpiece is fixed.

FIG. 6 is a diagram showing a state in which the rotary table is rotated 90 degrees counterclockwise from a horizontal position.

FIG. 7: Rotating the rotary table clockwise 9 from the horizontal position
The figure which shows the state turned 0 degree.

FIG. 8 is a diagram showing a state in which a workpiece that has been cut while removing the lower surface of the lower flange is removed.

FIG. 9 is a view showing a state in which a web of a workpiece is fixed so as to cut the lower surface of the lower flange.

FIG. 10 is a diagram showing a state in which a workpiece after cutting is removed.

FIG. 11 is a view showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 surface plate 2 table 3 rotary table 4 support bracket 10 positioning device 11 fixed block 11a end face of fixed block 12 moving block 12a end face of moving block 13 I-shaped workpiece 13a lower flange 13b web 13c upper flange

Claims (1)

(57) [Scope of request for utility model registration] 1. A table fixed on a surface plate with supporting brackets erected at both ends, a rotary table rotatably supported by supporting brackets provided at both ends of the table, and a rotary table rotatable. A positioning device fixed to the support bracket at a plurality of positions in the direction, a fixed block fixed to one side of the upper surface of the rotary table, and one side of the upper surface of the rotary table opposed to the fixed block and slidably in the width direction of the rotary table. An upper groove in which the lower flange of the I-shaped workpiece is fitted on the inner upper part of the fixed block and the movable block, and a lower part in which the upper flange of the workpiece is loosely fitted on the inner lower part. With a groove,
A workpiece fixing device for a machine tool, wherein the inner end faces of the fixed block and the moving block are used as web holding portions of an I-shaped workpiece.