JPH0353764Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a drawing device for pipe material, which enables products with good processing accuracy such as small drawing bends to be obtained with fewer adjustment operations. This is what we provide.

(Prior art) As a technique for reducing the processing accuracy of a drawing device, especially the bending of the drawing device, there is a technique in which a carriage or a carriage guide rail is provided at the same height as the mounting position of the die, as disclosed in Utility Model Publication No. 50-19002. Publication No. 51-29903 discloses a device in which a spherical die is rotatably mounted on a die holder, and the peripheral part of a die adjustment plate integrated with the die is attached to the machine frame using multiple adjustment screws. In Japanese Utility Model Publication No. 39-18945, the spherical part of a die holder integrated with the die is rotatably fitted to the base, and the distance between the circumferential part of the die holder and the base is detected by sensors at multiple locations. Utility Model Application Publication No. 61-27505 uses an adjustment bolt to adjust the above distance.
Each is known.

(Problems to be solved by the invention) (1) The above-mentioned Utility Model Publication No. 51-- in which the die is rotated along the spherical part in order to reduce the bending of the drawing.
In Publication No. 29903 and Publication of Utility Model Application No. 61-27505,
The center of the drawing part of the die in the drawing direction is deviated from the center of the spherical surface of the spherical part.

Therefore, when the die is rotated along the spherical portion relative to the die holder or base, which is a stationary member, the constricted portion of the die becomes increasingly deviated from the drawing center line of the tube material.

As a result, when the die is rotated along the spherical portion in order to reduce the drawing bending, a problem arises in that the tube material is rather strongly bent at the drawing portion.

(2) In order to correct the drawing bend, the distance of the die to the machine frame or base, which is a stationary member, is adjusted using multiple adjustment screws or adjustment bolts. Showa 61
In Publication No. 27505, the screwing of multiple adjustment screws and adjustment bolts is adjusted while checking the degree of bending of the product and the distance mentioned above.
Such adjustment operations require a high level of skill and a large amount of effort.

This invention proposes a drawing device that can reasonably solve the problems of the prior art.

(Means for solving the problem) The structure of this invention to solve the above problem is as follows.
The carriage 4 and the die 17 are arranged so that the center O of the drawing part 17a of the die 17 in the drawing direction is on the drawing center line of the carriage 4, which grips and moves the tube material 8, and the die holder 18, which is integrated with the die 17, The spherical part 18a is placed in the die box 1.
The die is attached via a plurality of mounting devices 24 which are rotatably fitted into the spherical recess 19a of the die box 19, and which enable adjustment of the distance at a plurality of locations on the circumference of the die box 19 to the die stand 23, which is a stationary member. In the drawing device in which the box 19 is attached to the die stand 23, the spherical part 18a is formed so that the spherical center of the spherical part 18a coincides with the drawing direction center O of the constricted part 17a of the die 17, and the die holder 18 is The periphery of the die box 1 is fixed by a plurality of fixtures 20.
It is characterized by being elastically held at 9.

Moreover, the stress measuring rod 27 that connects the die box 19 and the die stand 23 is disposed corresponding to the mounting device 24, so that the difference in stress values appearing on the stress measuring rod 27 during the drawing operation can be measured. The mounting device 24 is automatically controlled so that the distance is adjusted based on the distance.

(Function) The center O of the drawing part 17a of the die 17 in the drawing direction is made to coincide with the center of the spherical surface of the spherical part 18a, and the peripheral part of the die holder 18 is elastically held to the die box 19 by a plurality of fixtures 20. Therefore, the die 17 and the die holder 1 are arranged so that the center O of the constricted portion 17a in the drawing direction always approaches the center of the spherical surface of the spherical portion 18a due to the drawing force applied to the tube material 8.
8 is held in the die box 19 by self-aligning action.

Even when the die 17 rotates, the center O of the drawing part 17a in the drawing direction hardly deviates from the center line of movement of the carriage 4, so that the drawing bending that occurs in the pipe product 42 is extremely small.

Since the mounting device 24 is automatically controlled so that the distance is adjusted based on the mutual difference in stress values appearing on the stress measuring rod 27 that connects the die box 19 and the die stand 23, the tube Even when the bending or the like of the material 8 is larger than the standard, the die box 19 is automatically adjusted to a state where the bending when pulled out is small, and the adjustment operation does not require a high level of skill and effort.

(Example) Examples of this invention will be described below based on the drawings.

An example of the overall layout of the extraction device is shown in FIG. 4 as a plan view and FIG. 5 as a front view, respectively.
2 shows a longitudinal sectional front view of the main parts thereof, FIG. 2 shows a view taken along the line A--A in FIG. 1, and FIG. 3 shows a view taken along the line B--B in FIG. 1.

First, the main parts will be explained.

The running bed 11 has a flat guide surface 12 on its top and left and right guide surfaces 1 on its left and right outer upper parts.
3 and 13, respectively, and the carriage 4 has its sliding surface 9 on the guide surface 12 of the traveling bed 11, and the left and right side rests 10, 10 on the left and right guide surface 1.
3 and 13, respectively.

A carriage cylinder 14 fixed to the running bed 11 connects its piston 15 to the carriage 4.

A plurality of product receiving cylinders 43 are installed vertically at the center position of the traveling bed 11 in the horizontal direction.
A product receiving cylinder 4 is disposed in the longitudinal direction within 1.
The piston 44 of No. 3 can be projected upward from the guide surface 12.

The pawl holder 1 is divided into an upper pawl piece 2 and a lower pawl piece 3, and the upper pawl piece 2 is engaged with a guide groove 5 provided in a carriage 4 so as to be vertically slidable, and is moved by a piston 7 of a chuck cylinder 6. The mouth part 8a of the tube material 8 is checked with the upper claw piece 2 and the lower claw piece 3 by moving it up and down.

A dice stand 23 is connected to the traveling bed 11, and the distance between the dice stand 23 and the dice box 19 at multiple locations on the perimeter can be adjusted by respective mounting devices 24, which will be described later. It is attached to the corresponding position of the dice stand 23 as shown in FIG.

A spherical recess 1 is provided in the center of the die box 19.
9a is formed, and a spherical part 18a (radius is R) provided at the center of the die holder 18 is rotatably fitted into this spherical recess 19a, and the die holder 18
The peripheral portion of the die box 19 is elastically held to the die box 19 by a plurality of fixtures 20, which will be described later.

The die 17 is fitted into the center of the die holder 18, and the spherical portion 18a is formed such that the spherical center of the spherical portion 18a of the die holder 18 coincides with the center O of the constricted portion 17a of the die 17 in the drawing direction.

Furthermore, the carriage 4 and the die 17 face each other so that the center O of the drawing part 17a of the die 17 in the drawing direction is within the extension plane of the guide surface 12 of the traveling bed 11, which is the center line of movement of the carriage 4. is set up.

The illustrated fixture 20 includes a bolt 21 loosely inserted into the die holder 18 and screwed into the die box 19, and a spring 22 interposed between the head 21a of the bolt 21 and the die holder 18. .

The illustrated mounting device 24 includes an adjusting cylinder 25 in which a cylinder body 25c is fixed to the die stand 23 and a tip end of a piston 26 is fixed to the die box 19, respectively.

Stress measuring rods 27 for connecting the die box 19 to the die stand 23 are arranged corresponding to the respective mounting devices 24, and the stress value appearing on the strain gauge 28 of each stress measuring rod 27 during the drawing operation is measured. The piston 26 of the adjustment cylinder 25 is automatically adjusted in and out based on the mutual difference.

This in/out adjustment is performed by controlling one or more adjustment cylinders in accordance with a command from a control device 29 composed of a microcomputer or the like so that the measured values by each strain gauge 28 during the pulling operation are the same. 25 front chamber 25a or rear chamber 2
The piston 26 is moved in and out by supplying or discharging pressure oil into the interior of the piston 5b.

Next, the layout of the illustrated drawing device will be explained.

As shown in FIGS. 4 and 5, a bed 34 is placed on the opposite side of the traveling bed 11 across the die stand 23, and a cross-feeding table 36 engaged with a guide 35 of the bed 34 is moved between a plurality of It is configured to be movable at right angles to the longitudinal direction of the bed 34 (direction of the center line of movement of the carriage 4) by means of a transverse feed cylinder 33 and a piston 37.

A plug cylinder 39 having a plug 38 which is a piston, and a plug 3
A plurality of material receiving arms 40 that support the tube material 8 inserted into the tube material 8 and an elevating cylinder 41 that raises and lowers each material receiving arm 40 in unison are provided.

Material conveyors 30, 30, . A rail 32 is provided.

A material conveyor 30 is placed across the running bed 11,
30, a plurality of intercepting cylinders 4 on the opposite side of...
6 is arranged, and the piston 47 of the intercepting cylinder 46
The piston 47 is connected to the take-up conveyor 45.
Due to the protruding operation, the take-up conveyor 45 is made to look between the product receiving cylinders 43, 43.

Next, the extraction procedure will be explained.

At the start of work, the material lifter 31 is located near the right end of the rail 32 as shown in FIG.
the plug 38 is in the retracted position, the material receiving arm 40 is in the lowermost position (not shown), the intercepting conveyor 45 is in the retracted position as shown, and the piston 7 of the chuck cylinder 6 is in the uppermost position, and the carriage 4 is in the position closest to the die stand 23.

The tube material 8 on the material conveyor 30 is transferred in the direction of the arrow A in FIG. 4, and a chuck (not shown) of the material lifter 31 descends, grabs the tube material 8, and ascends.
The material lifter 31 moves in the direction of arrow B along the rail 32.

When the material lifter 31 approaches the plug 38, the chuck of the material lifter 31 is lowered to expose the tip of the tube material 8 to the plug 38, and the material lifter 31 continues to move in the direction of arrow B until the tube material 8 is fully inserted into the plug 38. Ru.

Next, the lifting cylinder 41 is operated to support the tube material 8 by each material receiving arm 40 as shown in FIG.
The piston 37 of each cross-feed cylinder 33 is operated to move the cross-feed table 36 to the position shown in FIG.

Then, the plug 38 is protruded so that the mouth part 8a of the tube material 8 passes through the die 17, the mouth part 8a is exposed between the upper claw piece 2 and the lower claw piece 3 of the claw holder 1, and the chuck cylinder is The piston 7 of No. 6 is moved downward to check the opening portion 8a with the upper claw piece 2 and the lower claw piece 3.

and the piston 15 of the carriage cylinder 14
Gradually pull in the carriage 4 as shown in Figure 4.
By pulling out and moving to the right in FIG.
The tube is drawn out to a predetermined diameter.

The tube product 42 formed by drawing is supported by a piston 44 of a product receiving cylinder 43.

After the drawing operation is finished, the piston 44 is slightly protruded to raise the pipe product 42 a little, the piston 47 of the pick-up cylinder 46 is protruded, the tip of the pick-up conveyor 45 is exposed below the pipe product 42, and the product receiving cylinder is opened. When the piston 44 of 43 is retracted, the pipe product 42 is transferred to the conveyor 45.
will be transferred.

Then, the piston 47 of the intercepting cylinder 46 is retracted to return the intercepting conveyor 45 to the position shown in FIG. do.

Next, the action at the time of pulling out will be explained.

The center O of the drawing part 17a of the die 17 in the drawing direction is made to coincide with the spherical center of the spherical part 18a, and the circumferential part of the die holder 18 is elastically held to the die box 19 by a plurality of fixtures 20, so that the tube The die 17 and the die holder 1 are arranged so that the center O of the drawing part 17a in the drawing direction always approaches the center of the spherical surface of the spherical part 18a due to the drawing force applied to the material 8.
8 is a die box 1 due to automatic centering action.
It is held at 9.

Even when the die 17 rotates, the center O of the drawing part 17a in the drawing direction hardly deviates from the center line of movement of the carriage 4, so that the drawing bend that appears in the pipe product 42 is small.

If the distortion in the cross-sectional shape and the bending in the length direction of the tube material 8 are within the specifications, the above-mentioned automatic mechanism rotates so that the center O of the drawing part 17a in the drawing direction always approaches the spherical center of the spherical part 18a. Due to the drawing and squeezing action with centering action, the pipe product 42 is quickly drawn out and can be kept within a desired drawing bending value range.

However, if the distortion in the cross-sectional shape or the bending in the length direction of the tube material 8 is larger than the standard, it is not possible to keep it within the desired drawing bending value using only the above-mentioned self-aligning action. There are cases where this is not possible.

In such a case, the stress measuring rod 2 connecting the die box 19 to the die stand 23
The mounting device 24 is automatically controlled by the control device 29 so that the distance of the die box 19 from the die stand 23 is adjusted based on the mutual difference in stress values appearing at 7.

That is, the product portion 8b that has passed through the die 17 is
For example, when the rod bends downward in FIG. 1, the stress value generated in the lower stress measuring rod 27 appears larger than the stress value of the stress measuring rod 27 in other parts.

Therefore, according to a command from the control device 29, the pressure oil in the front chamber 25a of the lower adjusting cylinder 25 is slightly discharged, and a small amount of pressure oil is supplied into the rear chamber 25b to cause the piston 26 to protrude a little. A little dice stand 23 at the bottom of 19
The operation is adjusted to move away from the target.

As a result, the downward bending of the product portion 8b thereafter becomes extremely small.

In this way, the distance between the die box 19 and the die stand 23 at its periphery is automatically adjusted so that the bending during drawing is minimized.
The troublesome adjustment operation of manually adjusting the screwing in of multiple adjustment screws while checking the bend of b is unnecessary in this embodiment, and the adjustment operation does not require a high degree of skill and effort, and the performance is good. It has become a highly efficient extraction device.

Incidentally, according to the test results according to the above embodiment, the bending of the pipe product 42 is ±1/100 mm per 1 m of its length.
The following good results were obtained, and the straightening roll processing, polishing finish, and buffing finish after the drawing process were completely unnecessary, and the pipe product 42 could be used as it is, for example, in a paper feed roll of a copying machine.

In the illustrated example, a synthetic resin plate 16 is attached to the guide surface 12 and the left and right guide surfaces 13, 13, thereby making the sliding resistance smaller than when sliding between metals.

As the fixture 20, for example, an oil damper may be used.

(Effect of the invention) As described above, according to this invention, the center O of the drawing part 17a of the die 17 in the drawing direction is set to the spherical part 18a.
The periphery of the die holder 18 is attached to the die box 19 using a plurality of fixtures 20.
Since the die 17 and the die holder 18 are held elastically, the die 17 and the die holder 18 are held so that the center O of the constricted portion 17a in the drawing direction always approaches the center of the spherical surface of the spherical portion 18a due to the drawing force applied to the tube material 8. Ru.

Even when the die 17 rotates, the center O of the drawing part 17a in the drawing direction hardly deviates from the center line of movement of the carriage 4, so that the drawing bending that occurs in the pipe product 42 is extremely small.

However, because the distortion in the cross-sectional shape and the bending in the length direction of the tube material 8 are larger than the standard, the center O of the drawing part 17a in the drawing direction is rotated so that it always approaches the center of the spherical surface of the spherical part 18a. In some cases, it may not be possible to suppress the pull-out bending value within a desired range only by the above-mentioned self-aligning action.

In this case, the distances at multiple points around the circumference of the die box 19 to the die stand 23 can be calculated based on the mutual difference in stress values appearing on the stress measurement rod 27 that connects the die box 19 and the die stand 23. By automatically controlling the mounting device 24 so as to make the adjustment, the die box 19 is automatically adjusted to the die stand 23 in a state where the bending in drawing is small, and the adjustment operation requires a high level of skill and effort. It has now become possible to reduce the amount of bending caused by drawing out the pipe product 42 to an extremely small value.

As described above, according to this invention, it was possible to construct a drawing device with good performance and high efficiency.

[Brief explanation of the drawing]

Each figure shows one embodiment of this invention, with Fig. 1 being a partially longitudinal front view of the main parts of the extraction device, and Fig. 2 showing the first embodiment of the device.
3 is a view taken along the line BB of FIG. 1, FIG. 4 is a plan view showing the layout of the extraction device, and FIG. 5 is a front view of FIG. 4. be. 1... Claw holder, 2... Upper claw piece, 3... Lower claw piece, 4... Carriage, 5... Guide groove, 6...
...Chuck cylinder, 7, 15, 26, 37, 4
4, 47...Piston, 8...Pipe material, 8a...
Mouth part, 8b...Product part, 9...Sliding surface, 10
...Sway rest, 11...Traveling bed, 12...
... Guide surface, 13 ... Left and right guide surface, 14 ... Carriage cylinder, 16 ... Synthetic resin plate, 17 ...
...Dice, 17a...Aperture part, 18...Dice die holder, 18a...Spherical part, 19...Dice box, 19a...Spherical recess, 20...Mounting tool, 21...Bolt, 21a... Head, 22...
... Spring, 23 ... Dice stand, 24 ... Mounting device, 25 ... Adjustment cylinder, 25a ... Front chamber,
25b... rear chamber, 25c... cylinder body, 27...
...Rod for stress measurement, 28...Strain gauge,
29...Control device, 30...Material conveyor, 31
...Material lifter, 32...Rail, 33...Standing cylinder, 34...Bed, 35...Guide,
36...Transverse feed table, 38...Plug, 39
...Plug cylinder, 40...Material receiving arm,
41... Lifting cylinder, 42... Pipe product, 43...
...Product receiving cylinder, 45...Standing conveyor, 4
6... Taking cylinder, O... Center in drawing direction, R
……radius.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) The drawing part 1 of the die 17 is placed on the center line of the movement of the carriage 4 that grips and moves the tube material 8.
The carriage 4 and the die 17 are arranged so that the center O of the die 7a in the drawing direction is aligned, and the spherical part 18a of the die holder 18, which is integrated with the die 17, is rotatably fitted into the spherical recess 19a of the die box 19. , a die stand 23 which is a stationary member
In a drawing device in which a die box 19 is attached to a die stand 23 via a plurality of attachment devices 24 that can adjust distances at a plurality of points around the circumference of the die box 19, direction center O
The spherical part 18a is formed so that the spherical center of the spherical part 18a coincides with the die holder 1.
A drawing device characterized in that the peripheral portion of the die box 8 is elastically held to the die box 19 by a plurality of fixtures 20. (2) A stress measuring rod 27 that connects the die box 19 and the die stand 23 is disposed corresponding to each mounting device 24, and the stress values appearing on the stress measuring rod 27 during the drawing operation are compared with each other. The extraction device according to claim 1, characterized in that the attachment device 24 is automatically controlled so that the distance is adjusted based on the difference.