JP2013146751A - Working method and working device for workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reducing the cost of a plurality of times of drawing work and ironing work, and forming a deep cylindrical shape container by one time of drawing work.SOLUTION: A process for reducing a thickness of a material of a flange part F between an opening side end surface 2a of a die 2 and a collar 3 by compressing the flange part F of a workpiece by the collar, and a process for pressurizing the material on an outer side than the flange part F to a direction for pushing in between the opening side end surface 2a of the die 2 and the collar 3 are alternately performed or performed in parallel together with a push-in process of the workpiece to the die 2 by a punch 4. Thus, the material extended by reducing the thickness of the flange part F is made to flow into the die 2 and the material on the outer side of the flange part F is made to newly flow into the flange part F at the same time, and a deeper container can be formed compared to the drawing process constant in the thickness.

Description

  The present invention relates to a processing method for a member to be processed that is useful when applied to redrawing of a container that has been initially drawn, and a processing apparatus that is suitable for carrying out such a forming method.

  Deep drawing and the like are used in a wide range of fields in addition to container-shaped parts because they can produce a seamless integrally molded product in a short time.

  In general, in deep drawing, processing is performed by the pulling force of the punch. Therefore, if the drawing resistance or frictional force is increased, the material is likely to break at the punch shoulder, and the depth of the container that can be formed in one process is limited. In the container shown in FIG. 13, the punch shoulder Cs is a boundary portion between the bottom C1 and the side wall C2 of the container.

  For this reason, when producing a deep container, after the initial drawing process, reduce the drawing ratio (diameter of the container bottom before drawing / diameter of the container bottom after drawing) so as not to break, In general, a deep drawing product having a desired depth is obtained by performing redrawing and ironing a plurality of times while changing the processing jig.

  In the deep drawing process, as shown in FIG. 4, the disk-shaped flat plate P is set between the die 12 and the wrinkle restraining plate 7, and after pressing with the wrinkle restraining plate 7, the punch 14 is pushed into the hole of the die 12. Thus, the first squeezed container C0 is obtained. Then, as shown in FIG. 14, the diameter of the bottom of the container is gradually reduced by redrawing the initial drawn container C0 a plurality of times while changing the die 22, the collar 23, and the punch 24. Thereafter, the side wall of the container is thinned using the ironing punch 34 and the ironing die 32 to perform the ironing process, thereby increasing the depth and obtaining a desired container.

  Such processing steps are well known. For example, Patent Document 1 below discloses a method of forming using this method.

  There is also a method of releasing residual stress by heating between the die and wrinkle suppression plate, applying ultrasonic waves, or reducing the friction force between the die and the container using a lubricant during redrawing. For example, Patent Document 2 discloses a method of redrawing by cooling the punch while heating between the die-wrinkle restraining plates.

Japanese Patent Laid-Open No. 5-139436 JP 2005-34899 A

  However, in the conventional method as disclosed in Patent Document 1, in order to make a deep container by reducing the diameter of the molded product, a plurality of redrawing steps must be performed. Jigs such as dies, punches and wrinkle control plates are required for each process, and conveyance and transfer between the jigs are also required, resulting in increased costs and increased installation space. Moreover, although the method of heating as disclosed in Patent Document 2 and the method of using ultrasonic waves and a lubricant have certain effects, they still have to undergo several redrawing steps. This is a problem that must be solved from the viewpoint of cost reduction.

  In addition, it is extremely difficult to form a deep rectangular tube container in the redrawing process as compared to a cylindrical container. This is considered to be due to the shape problem, because the corner part speed is slower than the redrawing speed of the straight side part of the square tube, resulting in excessive shear strain between the two, leading to fracture. It is done.

  The present invention greatly reduces the cost of conventional redrawing and ironing operations that are performed multiple times, enables a very deep cylindrical container to be formed by a single drawing process, It aims at providing the processing method of the to-be-processed member which can be utilized suitably also for shaping | molding, and the processing apparatus useful for implementation of such a method.

  The present invention takes the following measures in view of the above problems.

  That is, in the processing method of the workpiece according to the present invention, the flange portion of the plate-like or cup-like workpiece to be set facing the die is sandwiched between the opening side end face of the die and the pressing tool, and the punch is inserted. By using the center part of the workpiece to be pushed into the opening of the die, the flange material is squeezed between the shoulder of the punch and the opening edge of the die and drawn into the opening of the die. In the method of forming a container having a reduced diameter, the material of the flange portion is opened by pressing the flange portion of the workpiece member with the pressing tool together with the step of pushing the workpiece member into the die by the punch. Alternating between the step of thinning between the side end surfaces and the step of pressurizing the material outside the flange portion in the direction of pushing between the opening side end surface of the die and the presser Or, by carrying out in parallel, the material on the outside of the flange part is made to flow to the flange part while the material stretched by thinning the flange part is made to flow into the die, thereby drawing the film with a constant thickness. It is characterized by forming a deeper container as compared with the above.

  In this way, the portion extended by the compression increases the depth (height) of the container after molding, so that it is possible to replace the jig such as a die without going through several steps as before. A container having a high aspect ratio and a large drawing ratio can be obtained in a single process, and a deeper container can be formed as compared with a drawing process with a constant wall thickness. It is not necessary to transport or deliver the workpiece, or the number of times can be reduced, and a lot of space is not required, so that the cost for molding can be greatly reduced.

  In addition, in order to easily press the material outside the flange portion in the direction of pushing between the opening side end face of the die and the presser, the workpiece is used as a cup-shaped container that has been initially drawn. By positioning the peripheral part of the bottom wall between the opening side end face of the die and the collar as the presser and compressing by the collar, and pressing the end face of the side wall in the punch pushing direction in parallel with the pushing of the punch, A method of compressing and thinning the material of the peripheral portion of the bottom wall that becomes the flange portion and the side wall newly flowing into the flange portion is preferable.

  According to such a method, the peripheral portion of the bottom wall of the container can be easily positioned and appropriately set between the opening side end face of the die and the collar as the presser, and the end face pressure is also applied to the entire circumference of the container. Can be made uniform, and the flow of the material into the flange portion can be homogenized, and the apparatus can be simplified.

  On the other hand, in order to omit the initial drawing procedure, the workpiece is a flat plate, and the position displaced by a predetermined distance from the center of the flat plate is positioned between the opening side end face of the die and the wrinkle holding plate as a pressing tool. The plate is compressed by the wrinkle holding plate and pressed in the direction toward the central portion in parallel with the pushing of the punch. A method for compressing and thinning the material of the peripheral portion flowing into the pipe is preferable.

  According to such a method, since the deep-drawn container can be formed at once from the flat plate, it is possible to more effectively reduce the process and the cost spent on it.

  In addition, in order to form a cylindrical body or the like having a high heat exchange function according to the above method, the flange portion of a plate-shaped or cup-shaped workpiece set to face the die is placed on the opening side of the die. It is sandwiched between the end face and the pressing tool, and the center of the workpiece is pushed into the opening of the die by using the punch to narrow the flange material between the shoulder of the punch and the opening edge of the die. In the method of forming a tubular body that is drawn into the opening and thereby has a diameter smaller than that of the workpiece, the pressing portion of the flange portion of the workpiece with the pressing tool is used together with the step of pushing the workpiece into the die by the punch. The material of the flange part is intermittently thinned between the opening side end face of the die by compressing the material and the material outside the flange part in parallel with the pushing by the punch. By alternately or in parallel with the step of pressing in the direction of pushing between the opening side end face of the metal plate and the pressing tool, the outer side of the flange portion flows while the material stretched by the thinning of the flange portion flows into the die. The state where the material in the flange is newly flowed to the flange portion and the state where the material outside the flange portion is allowed to flow to the flange portion while the flange portion is flowing in the die without changing the thickness are alternately repeated. Thus, a method of forming a cylindrical body whose inner surface is wavy along the axial direction is effective.

  In order to make the above-described processing method feasible, a die, a pressing tool and a punch used for drawing, a pressing tool driving means and a punch driving means for driving the pressing tool and the punch, and a workpiece to be processed Pressurizing means for pressurizing a material outside the flange portion in a direction to push the material into the flange portion, and the presser drive means thins the flange portion of the workpiece to a predetermined size or a predetermined ratio through compression by the presser. The punch is pushed by the punch driving means, and the flange portion is compressed by the pressing tool driving means and the material is pressed by the pressing means alternately or in parallel. It is desirable.

  As described above, according to the present invention described above, the pressing tool compresses the workpiece at the flange portion and pressurizes the end portion of the material to flow the compressed material into the die. A container having a high aspect ratio and a large squeezing ratio can be produced in a single process, and a deeper container can be formed, and at the same time, it can contribute to a significant reduction in the cost of forming.

The longitudinal cross-sectional view which shows the drawing apparatus which concerns on 1st embodiment of this invention. FIG. 2 is an enlarged longitudinal sectional view showing a portion X in FIG. 1. FIG. 3 is a longitudinal sectional view after drawing processing corresponding to FIG. 2. Explanatory drawing which shows the process of the first drawn container preparation. Explanatory drawing which shows the drawing process in one Embodiment of this invention. Process explanatory drawing which shows the said drawing process. A photograph showing an example of the container before and after the drawing. The photograph which shows an example of the throttle container shape | molded using the punch of the regular cylinder which concerns on 2nd embodiment of this invention. The photograph which shows an example of the aperture container shape | molded using the punch of a rectangular rectangular tube by shaping | molding according to FIG. The photograph explaining the material flow in the drawing process of the square tube container shown in FIG. Explanatory drawing which shows a part of process process in 3rd embodiment of this invention. Sectional drawing which shows typically the cylindrical body shape | molded with the processing method by 4th embodiment of this invention. The perspective view which shows typically the container shape | molded by drawing. The longitudinal cross-sectional view which shows the conventional drawing process schematically.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 is a longitudinal sectional view showing a processing apparatus 1 for carrying out a processing method of a member to be processed according to this embodiment, and FIGS. 2 and 3 are enlarged views of an X portion in FIG.

  The processing apparatus 1 includes a die 2 arranged coaxially and used for drawing processing, a collar 3 and a punch 4 as a pressing tool, a pressing tool driving means 51 for driving the collar 3 as a pressing tool, and punch driving. Means 52.

  The die 2 has an annular shape, and is formed with a convex R-shaped inner guide surface 2b that gradually decreases in the drawing direction toward the center at the opening edge on the inner peripheral side of the opening-side end surface 2a. A concave R-shaped outer guide surface 2c is formed on the outer peripheral side of the end surface 2a. The outer guide surface 2c, the opening-side end surface 2a, and the inner guide surface 2b are smoothly continuous.

  The punch 4 has a rod shape smaller than the opening diameter of the die 2, and the punch shoulder 4 a is formed in a convex R shape having substantially the same curvature as the inner guide surface 2 b, and can move forward and backward with respect to the die 2. Is arranged.

  The collar 3 has a cylindrical shape having a punch insertion hole 3a, and the punch 4 is inserted into the punch insertion hole 3a so as to protrude and retract. The surface of the die 2 that faces the opening-side end surface 2a is a pressure surface 3a, and is arranged so as to be able to advance and retreat with respect to the die 2 independently of the punch 4.

  A cylindrical pushing member 61 constituting the pressurizing means 6 of the present invention is fitted on the outer periphery of the collar 3. The pushing member 61 is provided with an annular meat stealing portion 6a on the inner periphery near the opening end on the die 2 side, and a step portion 6b is formed at a position having a different inner diameter.

  The presser drive means 51 is configured to drive the collar 3 forward and backward in the axial direction, and the punch drive means 52 is configured to drive the punch 4 forward and backward in the axial direction. For these driving means, an electric hydraulic jack, a manual hydraulic jack, and other appropriate actuators can be used.

  Further, in order to drive the pushing member 61 in the axial direction, pushing member driving means 53 is provided. The pushing member driving means 53 can also be an electric hydraulic jack, a manual hydraulic jack, or other appropriate actuator.

  As shown in FIG. 4, the container C0 subjected to drawing processing in this embodiment includes a disc-shaped flat plate P sandwiched between an annular die 12 and a wrinkle restraining plate 7, and then punches 14 into the wrinkle restraining plate 7. It is obtained by pushing into the hole of the die 12 from the side. As shown in FIG. 5 (a), the bottom wall c 1 of the initial squeeze container C 0 is positioned in the gap between the opening side end surface 2 a of the die 2 and the pressure surface 3 a of the collar 3, and the side wall c 2 of the container C 0 is It is positioned and set on the meat stealing portion 6a of the pushing member 61 on the outer periphery.

  In this embodiment, the punch diameter φd1 = 16 mm and the die hole diameter φd2 = 19 mm shown in FIG. 2 are used, and the redrawing ratio (the diameter of the container bottom before redrawing / the diameter of the container bottom after redrawing) is Set to 2.5. As shown in FIG. 7A, the first squeezed container C0 is a soft aluminum (A1100-O) having a plate thickness of 1 mm, a diameter d = 40 mm, and a depth a = 18.5 mm.

  Next, one processing procedure according to the present embodiment will be described with reference to FIGS.

  (i) As shown in FIGS. 5 and 6, the initial squeeze container C0 is set between the die 2 and the collar 3 (FIG. 5 (a), ST1). Next, the punch 4 is operated toward the opening of the die 2, and the material of the flange portion F is punched by pushing the bottom wall c <b> 1 of the initial drawing container C <b> 0, which is the central portion of the workpiece, into the opening of the die 2. Squeezed between the shoulder 4a of the die 2 and the opening edge (inner guide surface 2b) of the die 2 and drawn into the opening of the die 2 (FIG. 5 (a) → (b) → (c) → (d), ST2) . The punch 4 is driven so that the reading of the pressure gauge of the electric hydraulic pump becomes a constant value, for example.

  (ii) In parallel with this, the presser driving means 51 is operated, and the collar 3 is reciprocated toward the die 2 to hit the flange portion F, so that the flange portion is between the die 2 and the collar 3. F is compressed to reduce the thickness of this portion (FIG. 5B, ST3). At this time, since the outside of the flange portion F is dammed to the outer guide surface 2c of the die 2, the surplus material generated by the thinning of the flange portion F flows into the opening of the die 2 so as to be pushed out by compression. And drawn.

  (iii) Further, the pushing member 61 is driven by the pushing member driving means 53, and a load in the punch pushing direction is applied to the side wall end face Ce of the container C0 (ST3 (c)). Since this pushing force compresses the side wall C2 in the direction from the side wall C2 of the container C0 toward the flange part F, the collar 3 strikes the flange part F and moves backward toward the gap between the collar 3 and the die 2. Part of the material of the side wall C <b> 2 flows into the gap between the collar 3 and the die 2 to newly form the flange portion F.

  The striking of the collar 3 in the process (ii) and the pressurization of the end face of the container C0 in the process (iii) may be alternately repeated using a manual hydraulic jack. The collar 3 may be continuously reciprocated while the end face pressure is applied and repeated hitting. In this case, a stopper for setting a size and a ratio for compressing the flange portion F is provided at an appropriate position of the apparatus so that the collar 3 does not compress the flange portion F beyond a certain level. As a result, the collar 3 becomes idle after the flange portion F has been compressed by a predetermined size (predetermined ratio) by striking. In any case, by repeating such an operation, the material flowing into the flange portion F by the traction force of the punch 4 and the end pressure (end surface pressure) is successively thinned by the die 2 and the collar 3 and flows into the die 2. Then, deep drawing is advanced while compensating for the material that is insufficient in the flange portion F from the side wall C2. For this reason, even if the punch 4 is driven at a constant oil pressure, generation of a high stress that causes the material Cs to break in the punch shoulder 4a is avoided.

  (iv) When the pushing member 61 comes into contact with the die 2 and the end surface Ce of the container C0 flows into the die lower end surface 2d (ST4), the load on the punch 4 is stopped (ST5) and the redrawing process is finished (ST6). ).

  Through such a processing method, the material is rolled as much as the thickness is reduced, and this is the depth (height) of the container C0. A container having a desired depth (height) is formed by a single drawing process. The molded product thus obtained is shown in FIG. As shown in FIG. 7, it is possible to realize processing with a high aspect ratio (container height / container diameter) that cannot be formed by conventional redrawing.

  As described above, according to the present embodiment, since the portion extended by compression increases the depth (height) of the molded container, the jig such as a die is exchanged several times as in the prior art. Even without going through the process, it is possible to obtain a container having a high aspect ratio and a large drawing ratio in a single process, making it possible to form a container deeper than drawing with a constant wall thickness. It is possible to eliminate or reduce the transport and delivery of workpieces between tools and jigs, and it is not necessary to use much space, so it is possible to achieve a significant reduction in molding costs. .

  In particular, the stretched portion of the material compressed in the flange portion flows into the die 2, and thereby the insufficient material is replenished from the side wall to the flange portion F by pressurization of the end face, so that it is located on the shoulder portion 4 a of the punch 4. The load burden on the material Cs is reduced, the limit drawing ratio is improved, and appropriate molding can be performed without causing breakage.

  In particular, deep containers that can be produced by this method can be processed for metal materials with high tensile strength, such as iron, stainless steel, aluminum, and copper, and can be applied to a wide range of fields. Suitable for such as.

  Further, in the present embodiment, a cup-shaped container C0 that has been initially drawn is used as a workpiece, and the periphery of the bottom wall of the container C0 is provided on the opening side end face 2a of the die 2 and a collar 3 that is a pressing tool. And the peripheral portion of the bottom wall C1 that becomes the flange portion F by pressing the end face Ce of the side wall C2 in the pushing direction of the punch 4 in parallel with the pushing of the punch 4 Since the material of the side wall C2 newly flowing into the flange portion F is compressed and thinned, the peripheral portion of the bottom wall of the container C0 is formed with the opening side end surface 2a of the die 2 and the collar 3 as a pressing tool. It is easy to set properly between them, and the end face pressure is evenly applied to the entire circumference of the container C0, so that the inflow of the material into the flange portion F can be homogenized and the apparatus configuration is simplified. Become.

  That is, the apparatus configuration employed in the present embodiment includes a die 2 used for drawing, a collar 3 and a punch 4 that are pressers, a presser drive unit 51 and a punch drive unit 52 that drive the collar 3 and the punch 4, A pressurizing means 6 for pressurizing a material outside the flange portion F of the workpiece (for example, the first drawn container C0) in a direction to push the material into the flange portion F, and the presser drive means 51 is a collar that is a presser. 3 is set so that the flange portion F of the first squeeze container C0 is thinned to a predetermined size or a predetermined ratio through compression by the compression of the punch 4 by the punch drive means 52 and the compression of the flange F by the presser drive means 51. It is sufficient if the material is pressed by the pushing member 61 alternately or in parallel.

  In addition to the above embodiment, for example, during drawing, the container may be heated at the flange, etc., ultrasonic waves may be applied to the flange, etc., or a lubricant may be used to increase the compression processing speed. Is possible.

  In this embodiment, soft aluminum (A1100-O) having a plate thickness of 1 mm is used, and the first drawn container C0 having a diameter of d40 mm and a depth of a18.5 mm is subjected to drawing processing. However, the present invention is not limited to this, and various modes of materials can be selected.

<Second embodiment>
In the second embodiment, a rectangular punch (not shown) is used, and other configurations are the same as those described in the first embodiment with reference to FIGS. 1 to 3 and the same initial squeeze container C0 (see FIG. 2). An example of forming a rectangular tube container will be described.

  In this embodiment, the punch head has a regular shape with a side length of 17.5 × 17.5 mm (corner R portion 3 mm), and the die opening has a regular shape with a side length of 20 × 20 mm (corner R portion 4 mm). The drawing process is performed using this die.

  FIG. 8 shows an example of the regular rectangular tube shape obtained in this manner, and FIG. 9 shows an example of the rectangular rectangular tube shape. As is apparent from this figure, a very deep drawing process is possible even for a rectangular container.

  Here, the material flow at the time of molding this rectangular container will be considered.

  FIG. 10 shows the material flow from the first drawn container to the final molded product in the drawing process of the present embodiment using a marking line. FIG. 10A is a perspective view of the initial squeeze container, FIG. 10B is a front view thereof, FIG. 10C is a perspective view of a molded product, and FIG. The vicinity of the corner of the container is Sr, and the other straight side is S1. In the figure, the marking line around the head portion of the initial squeezed container (FIGS. (A) and (b)) is a curve that protrudes upward at the side wall of the molded product (FIGS. (C) and (d)). However, the marking lines drawn in parallel at equal pitches in the height direction on the side walls of the first drawn container (the same drawing (a), (b)) are after molding (the same drawing (c), (d) ) Also appears in a state where the pitch spreads in parallel to the cup height direction in the straight side portion Sl, and the scribing line continues at the same height as the straight side portion Sl in the corner portion Sr. That is, the material on the side wall portion of the material uniformly flows into the molded product right side portion S1 or the corner portion vicinity Sr while extending by compression. Therefore, in the vicinity of the side portion of the container, the drawing speed of the straight side portion S1 of the rectangular tube container and the drawing speed of the corner portion Sr are substantially equal, so that excessive shear strain is generated in the material in the die (not shown). It is considered that a deep square container can be formed.

  In addition, the present invention can form not only a square cylindrical container, but also a rectangular container using a rectangular punch in exactly the same manner. 9 shows.

  Thus, according to the present invention, drawing from a cup-shaped initial drawn container to a rectangular container can be realized under an appropriate material flow, and drawing into a cylindrical container that is easier to mold. It goes without saying that proper material flow occurs in processing.

  It should be noted that it is of course possible to use a rectangular tube-shaped collar that matches the shape of the container if it is not necessary to take into account the cost of jig fabrication when preparing the rectangular container as described above.

  Further, in this embodiment, square punches and dies are used, but not limited thereto, other polygonal punches and dies can be used, and in accordance with this, for forming triangular, pentagonal, and hexagonal containers Can also be applied.

<Third embodiment>
This embodiment shown in FIG. 11 shows a part of the processing steps when forming a deep-drawn container from the flat plate R, and the same reference numerals are given to the parts common to the first embodiment, and the details thereof are shown. The description will be omitted, and different points from the first embodiment will be described.

This embodiment, a position a predetermined distance displaced from the center of the disk-shaped flat plate R as flanges F _2, the flange portion F ₂ sandwiched between the blank holder plate 47 is a die 42 and the pressing member, the flange portion In the same manner as the collar 3 described above, the F ₂ is struck by the wrinkle restraining plate 47 so as to be compressed and thinned with the opening side end surface 42a of the die 42, and the peripheral portion of the flat plate R is directed toward the center portion, that is, the compressed processed material in a flat plate R by pressurizing in a direction pushing direction and vertical punch 44 to flow into the die 42, the peripheral portion of the flat plate R which is outside of the flange portion F ₂ on the flange portion F ₂ at the same time The material is newly flowed and compensated, and the flat plate R is formed into a deep container together with the traction force of the punch 44 in one step (see the broken line arrow in FIG. 11B).

  About the pressurizing means for pressurizing the material in the peripheral part of the flat plate R in the direction toward the center part, since the direction is different from that of the first embodiment, a similar structure cannot be taken. Nobuo Hatanaka, Norio Matsuura, Takashi Iizuka, Akio Takakura, Katsuhiko Yamaguchi “Molding of deep aluminum containers by friction-assisted deep drawing” Light Metal Vol. 60, No. 12 (2010), P641-646> It is possible to employ a technique such as pressurizing the material in the direction toward the center by using a frictional force using a formula-divided wrinkle suppression plate.

  By adopting such a method, a deep-drawn container can be formed at once from a flat plate, so that it is possible to more effectively reduce the process and the cost spent on it.

  As mentioned above, although one Embodiment of this invention was described, the specific structure and shaping | molding method of each part are not limited only to embodiment mentioned above.

  For example, in the present embodiment, the disk-shaped flat plate R is used. However, the shape of the flat plate is not limited to this, and various shapes can be adopted as long as the base plate can be pressed toward the center without deviation. is there.

<Fourth embodiment>
This embodiment relates to an application example in which the above processing method is applied to form a cylindrical body whose inner surface is waved along the axial direction as shown in FIG. 12, and the apparatus shown in FIG. 5 is used. Then, molding is performed in accordance with the process of FIG.

  Specifically, along with the step of pushing the work piece (here also referred to as container C0) into the die 2 by the punch 4, the collar 3 which is the pressing tool applies a blow to the flange portion F of the container C0 and compresses it. As a result, the material of the flange portion F is intermittently thinned between the opening-side end surface 2 a of the die 2 (FIG. 3B) and in parallel with the pushing by the punch 4 from the flange portion F. Further, the flange portion F is thinned by alternately or in parallel performing the step of pressing the material on the outer side in the direction of pushing between the opening side end surface 2a of the die 2 and the collar 3 (FIG. 3C). In this state, the expanded material flows into the die 2 while the material outside the flange portion F flows into the flange portion F, and the flange portion F flows into the die 2 without changing the wall thickness. While franc The state in which the material outside the portion F is newly flowed to the flange portion F is alternately repeated, thereby forming the cylindrical body 4C in which the outer surface 4c1 is smooth and the inner surface 4c2 is waved along the axial direction. is there.

  Therefore, the cylindrical body 4C formed by such a method can be suitably used for, for example, a heat exchanger.

  Although one embodiment of the present invention has been described above, the specific configuration and molding method of each part are not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 ... Processing apparatus 2, 42 ... Dice 2a, 42a ... Opening side end surface 3 ... Presser (color)
3a ... Hole 4, 44 ... Punch 4a ... Shoulder 6 ... Pressure means 47 ... Presser (wrinkle restraining plate)
51 ... Presser driving means 52 ... Punch driving means 61 ... Pushing member C0 ... Working member (initial drawing container)
C1 ... Bottom wall Ce ... End (end face)
C2 ... Side wall 4C ... Cylindrical body F, F ₂ ... Flange part R ... Work piece (flat plate)

Claims (5)

The flange part of the plate-like or cup-like workpiece to be set facing the die is sandwiched between the opening side end face of the die and the presser, and the center of the workpiece is placed in the die opening using a punch. In the method of forming a container having a diameter reduced from that of the workpiece by pulling the material of the flange portion by pressing between the shoulder portion of the punch and the opening edge of the die and drawing it into the opening of the die.
A step of compressing the flange portion of the workpiece with the pressing tool together with a step of pushing the workpiece into the die by the punch, thereby thinning the material of the flange portion between the opening side end surface of the die and The flange portion is extended by thinning the flange portion by alternately or in parallel with the step of pressing the material outside the flange portion in the direction of pushing between the opening side end face of the die and the presser. A material to be processed is characterized in that the material outside the flange portion is newly flowed to the flange portion while flowing the material into the die, thereby forming a deeper container than the drawing processing with a constant thickness. Processing method. The workpiece is a cup-shaped container that has been initially drawn, and the peripheral part of the bottom wall of the container is positioned between the opening side end face of the die and the collar that is the pressing tool, and is compressed by the collar. 2. The material of the peripheral part of the bottom wall which becomes a flange part and the side wall which newly flows into the flange part is compressed and thinned by pressurizing the end face of the side wall in the punch pushing direction in parallel with the pushing of the first part. The processing method of the to-be-processed member of description. The workpiece is a flat plate, and the position displaced by a predetermined distance from the center of the flat plate is positioned between the opening side end face of the die and the wrinkle pressing plate that is a pressing tool, and compressed by the wrinkle pressing plate, and the punch is pushed in In parallel with the pressure, the flat plate is pressed in the direction toward the center to compress and thin the material at the position displaced by a predetermined distance from the center of the flat plate that becomes the flange and the peripheral material that newly flows into the flange. The method for processing a workpiece according to claim 1. The flange part of the plate-like or cup-like workpiece to be set facing the die is sandwiched between the opening side end face of the die and the presser, and the center of the workpiece is placed in the die opening using a punch. In the method of forming a cylindrical body having a diameter smaller than that of the workpiece by narrowing the material of the flange portion by pushing between the shoulder portion of the punch and the opening edge of the die and drawing it into the opening of the die.
Along with the step of pushing the workpiece into the die by the punch, the flange portion of the workpiece is compressed with the pressing tool, so that the material of the flange portion is intermittently thinned between the opening end surface of the die. Performing the step of pressing and pressing the material located outside the flange portion in parallel with the pressing by the punch in the direction of pressing between the opening side end face of the die and the pressing tool, alternately or in parallel. A condition in which the material outside the flange part is caused to flow to the flange part while the material stretched due to the thinning of the flange part is caused to flow into the die, and the flange part is allowed to flow into the die without changing the wall thickness. While the material on the outside of the flange portion is newly flowed to the flange portion alternately, this forms a tubular body whose inner surface is wavy along the axial direction. Method of processing a workpiece, characterized in that. It is used for carrying out the processing method according to any one of claims 1 to 4,
Dies, pressers and punches used for drawing processing, presser drive means and punch drive means for driving the pressers and punches, and pressurizing the material outside the flange portion of the workpiece into the flange portion. Pressurizing means, and the presser drive means is set to thin the flange portion of the workpiece to a predetermined size or a predetermined ratio through compression by the presser, along with pushing of the punch by the punch drive means, An apparatus for processing a member to be processed, characterized in that compression of the flange portion by the presser driving means and pressurization of the material by the pressurizing means are performed alternately or in parallel.