JP2006289414A - Apparatus for correcting workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for correcting the shape of a workpiece, which apparatus can correct a workpiece even having curved portions. <P>SOLUTION: The apparatus 1 is used to correct the shape of the workpiece 2 made of metal, and comprises a male die 3 having a shape corresponding to the shape of the workpice after the correction, and a correcting bath 4 storing powder or granular material. The workpiece 2 to be corrected is fixed on the male die 3, and is pushed into the correcting bath 4, and is corrected by applying pressure thereon. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a workpiece correction device that corrects the shape of a workpiece, and more particularly to a workpiece correction device that corrects a workpiece by pressing the workpiece into a correction tank in which powder or particles are accumulated and applying pressure.

  Conventionally, thin and large metal members have been heat-treated to enhance mechanical properties. However, there is a problem that the metal member is distorted during the heat treatment. As a method of correcting this distortion, there are press correction in which a metal member is sandwiched and pressed with a regular shape mold, and local correction in which the metal member is partially pressed.

  In general, in the case of press correction, it is necessary to consider so-called springback in which the shape is restored by elastic deformation after correction even if it is corrected to a regular shape. The spring back is deformed by the elasticity remaining in the metal member when the metal member is taken out from the mold, and the amount of the spring back depends on the shape of the metal member and the characteristics of the casting. .

  Therefore, conventionally, a correction method has been implemented in which the amount of pressing is increased so that the workpiece has a regular shape after being changed by springback.

Further, as a countermeasure against springback, there is a technique for correcting a mold into a shape that takes into account the springback. ing.
JP 2004-160509 A

  In both cases of local correction and press correction, the amount of push-in is increased partially and linearly, so it is effective for linear products without curved parts, but partially for products with curved parts. There was a problem that it could not be corrected or a step was generated in the middle of the surface.

  In order to solve the above-described problem, the workpiece straightening device of the present invention is a workpiece straightening device for straightening the shape of a workpiece that is a metal member, and a male mold in which the shape of the workpiece after straightening is formed, and a powder Or it has a straightening tank in which granules are stored, and a work to be straightened is fixed to the male mold and pressed into the straightening tank to apply pressure.

  In the work straightening device according to the present invention, the work fixed to the male mold is pushed into the straightening tank in which the powder or granules are stored and pressure is applied, so that pressure can be uniformly applied to the entire work. This makes it possible to correct even a workpiece having a curved portion.

  Moreover, even if it is a shape which becomes an undercut in a solid mold, it can be uniformly pressed and corrected if it is powder or granules.

  Furthermore, since the powder or granule becomes a female mold, it can be corrected to a different shape only by exchanging only the male mold, and the production cost and production time of the mold can be greatly saved.

  Embodiments of a workpiece straightening apparatus according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram illustrating the configuration of the workpiece straightening apparatus according to the first embodiment. As shown in FIG. 1, the workpiece straightening device 1 of the present embodiment includes a male mold 3 to which a workpiece 2 that is a correction target is fixed, a straightening tank 4 in which powders or granules are stored, and a male mold 3. A baffle plate 5 installed in the periphery and a hydraulic cylinder 6 for pushing the male mold 3 into the correction tank 4 are provided.

  Here, the workpiece 2 as the correction object is a thin metal member, for example, an aluminum die-cast member used for a front side member of an automobile. However, non-ferrous metal materials including alloys such as nickel, zinc, and magnesium, and steel materials such as stainless steel may also be used.

  In the male mold 3, the shape of the workpiece 2 after correction is formed, and this shape is formed to be smaller by the amount of the spring back in consideration of the spring back of the workpiece 2. Then, the work 2 is covered with the male mold 3 and fixed, and the work 2 is corrected by being pushed into the correction tank 4 and applying pressure. At this time, the workpiece 2 is fixed on the male mold 3 by air suction.

  The correction tank 4 is a container for storing powder or granules, and the width and depth of the correction tank 4 are set in accordance with the size and depth of the workpiece to be corrected.

  The baffle plate 5 is a cylindrical or box-shaped member installed around the male mold 3, and plays a role of hindering the movement of the powder and granules. By providing the baffle plate 5, when the male mold 3 is pushed into the correction tank 4 and pressure is applied, the powder and granules do not move to the surroundings, so that pressure loss is prevented and the workpiece 2 is higher. Pressure can be applied.

  The hydraulic cylinder 6 moves the male mold 3 downward and pushes it into the correction tank 4 to apply pressure.

  In the workpiece straightening device 1 configured as described above, when the workpiece is straightened, the work 2 is first set on the male die 3. At this time, the workpiece 2 is fixed to the male mold 3 by air suction. Therefore, compared with the case where some fixing device is provided, it is possible to save the trouble of attaching to the fixing device, and the workpiece 2 can be easily fixed to the male mold 3. However, fixing the work 2 to the male mold 3 is not limited to air suction.

  When the workpiece 2 is fixed to the male mold 3, the male mold 3 is moved downward by the hydraulic cylinder 6, and the powder or granules accumulated in the correction tank 4 as shown in FIG. The work 2 is pushed into and pressure is applied. Thereby, powder or a granule becomes a female type | mold, and the workpiece | work 2 can be corrected to the shape formed in the male type | mold 3. FIG.

  As described above, since the powder or granule has a female shape, even a workpiece having a curved portion, which has been difficult in the past, can be corrected.

  Incidentally, as shown in FIG. 3, when the work 32 (the cross-sectional shape is the same as that of the work 2) is pushed in and corrected using the conventional cam mechanism 31, the curved portion 33 cannot be partially corrected. There arises a problem that a step occurs in the middle of the surface.

  However, in the workpiece straightening device 1 of the present embodiment, the powder or particles are formed into a female shape, so that pressure can be applied uniformly to the entire workpiece, even if the workpiece has a curved portion. It becomes possible to correct. Furthermore, even if it is an undercut shape that is difficult to be pushed in by a solid die such as a mold, it can be pushed in if it is powder or granules. Further, since the female mold is powder or granules, it is possible to correct workpieces having different shapes by replacing only the male mold 3. Therefore, it is possible to greatly save the mold production cost and production time.

  Furthermore, the surface of the workpiece 2 can be polished by repeatedly performing the operation of pushing the workpiece 2 into the powder or granule a plurality of times.

  Further, when the male mold 3 is pushed into the straightening tank 4, the powder or particles move to the periphery. However, since the baffle plate 5 is provided around the male mold 3, the pressure loss is prevented and the workpiece 2 is prevented. Higher pressure can be applied.

  When the shape of the workpiece 2 is corrected to the shape formed on the male mold 3 in this way, the workpiece 2 is taken out from the powder or granules, and the correction of the workpiece by the workpiece correction apparatus 1 of this embodiment is completed.

  Thus, in the workpiece correction apparatus 1 of the present embodiment, the workpiece 2 fixed to the male mold 3 is pushed into the correction tank 4 in which powder or granules are stored, and pressure is applied to correct the workpiece. Pressure can be applied uniformly, and even a workpiece having a curved portion can be corrected. Moreover, even if it is a shape which becomes an undercut in a solid type | mold, if it is a powder or a granule, uniform indentation will be possible and it can correct. Furthermore, since the powder or granule becomes a female mold, it can be corrected to a different shape by replacing only the male mold 3, and the production cost and production time of the mold can be greatly saved (claims). 1 effect).

  Further, in the workpiece straightening device 1 of the present embodiment, the baffle plate that prevents the movement of the powder or granules is provided around the male mold 3, so that pressure loss due to the movement of the powder or granules is prevented and the workpiece 2 is prevented from moving. On the other hand, a higher pressure can be applied (effect of claim 2).

  Furthermore, in the workpiece correction apparatus 1 of the present embodiment, since the workpiece 2 is fixed to the male mold 3 by air suction, it is possible to save the trouble of attaching the workpiece to the fixing device as compared with the case where the workpiece 2 is fixed by the fixing device. The workpiece 2 can be easily fixed to the male mold 3 (the effect of claim 5).

  Moreover, in the workpiece correction apparatus 1 of the present embodiment, the workpiece 2 can be polished by repeating the operation of pushing the male mold 3 into the correction tank 4 a plurality of times (the effect of claim 6).

  FIG. 4 is a diagram illustrating the configuration of the workpiece straightening apparatus according to the second embodiment. As shown in FIG. 4, the workpiece straightening device 41 of the present embodiment is different from the first embodiment in that an air pipe 42 is installed on the bottom surface of the straightening tank 4, and other configurations are the same as the first embodiment. The same number is attached and detailed explanation is omitted.

 Here, the air pipe 42 is for blowing air into the powder or granules stored in the correction tank 4 to fluidize the powder or granules. When the work 2 fixed to the male mold 3 is pushed into the straightening tank 4, the air 42a is blown from the air pipe 42 to fluidize the powder or particles, thereby reducing the resistance when the male mold 3 is pushed in. I am letting. Then, when the work 2 has entered the correction tank 4 to some extent, the blowing of air is stopped, and pressure is applied to the work 2 to correct the shape of the male mold 3.

  Thus, in the workpiece straightening device 41 of the present embodiment, the male mold 3 is placed in the straightening tank 4 in a state where the air pipe 42 is installed and air is blown into the straightening tank 4 to fluidize the powder or granules. Therefore, even if the workpiece 2 has a deep shape and the workpiece 2 has to be pushed deeper into the correction tank 4, it can be pushed smoothly with little resistance. As a result, the resistance of the powder or granules can be reduced as compared with the case where the workpiece 2 is pushed into the straightening tank 4 in a stationary state. It can be kept low (effect of claim 3).

  FIG. 5 is a diagram illustrating the configuration of the workpiece straightening apparatus according to the third embodiment. As shown in FIG. 5, the workpiece straightening device 51 of this embodiment includes a variable bottom 52 on the bottom surface of the straightening tank 4 and a hydraulic cylinder 53 that moves the variable bottom 52 up and down. Since other configurations are the same as those in the first and second embodiments, the same reference numerals are given and detailed descriptions thereof are omitted.

  The variable bottom 52 in this embodiment is moved up and down by a hydraulic cylinder 53 to change the depth of the correction tank 4. And after moving the variable bottom 52 up and down, powder or a granule can be added or removed. Accordingly, when the workpiece 2 is small and the depth of pressing is small, the volume of the powder or granules is reduced, and when the workpiece 2 is large and the depth of pressing is deep, the volume of the powder or granules is increased. Can be adjusted. Therefore, it becomes possible to make the volume of the powder or granule suitable for the workpiece to be corrected.

  However, the air pipe 42 is longer than the moving range of the variable bottom 52 so that the powder or particles can be fluidized even if the variable bottom 52 moves up and down. In addition, a dummy block may be installed in place of the variable bottom 52 to adjust the depth of the correction tank 4.

  Thus, in the workpiece correction apparatus 51 of the present embodiment, since the bottom surface of the correction tank 4 can be moved up and down, the depth of the correction tank 4 suitable for each workpiece can be easily adjusted even when different workpieces are corrected. And the volume of powder or granules. This makes it possible to correct various types of workpieces (effect of claim 4).

  The work straightening device of the present invention has been described based on the illustrated embodiment. However, the present invention is not limited to this, and the configuration of each part is replaced with an arbitrary configuration having the same function. Can do.

It is a figure which shows the structure of the workpiece correction apparatus which concerns on Example 1. FIG. It is a figure which shows the state at the time of the workpiece | work pushing by the workpiece correction apparatus which concerns on Example 1. FIG. It is a figure for demonstrating the problem in the conventional workpiece correction method. It is a figure which shows the structure of the workpiece correction apparatus which concerns on Example 2. FIG. It is a figure which shows the structure of the workpiece correction apparatus which concerns on Example 3. FIG.

Explanation of symbols

1, 41, 51 Work correction device 2, 31 Work 3 Male 4 Correction tank 5 Baffle plate 6, 53 Hydraulic cylinder 42 Air pipe 52 Variable bottom

Claims (6)

A workpiece correction device for correcting the shape of a workpiece that is a metal member,
A male mold in which the shape of the workpiece after correction is formed;
It has a correction tank that stores powder or granules,
A workpiece straightening device, wherein a workpiece to be straightened is fixed to the male mold and pressed into the straightening tank to apply pressure.   The work straightening device according to claim 1, wherein a baffle plate is provided around the male mold to prevent movement of powder or granules.   The work correction according to claim 1 or 2, wherein the male mold is pushed into the correction tank in a state where air is blown into the correction tank and the powder or particles are fluidized. apparatus.   The work straightening device according to any one of claims 1 to 3, wherein a bottom surface of the straightening tank is movable up and down.   The work straightening device according to claim 1, wherein the work is fixed to the male mold by air suction. The work straightening device according to any one of claims 1 to 5, wherein the operation of pushing the male mold into the straightening tank is repeated a plurality of times.

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