JP2007296531A - Pressed product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressed product having an edge wall easily formed without requiring a lot of time and labor, and a plane portion flatly formed so as to be continued on the edge wall. <P>SOLUTION: The pressed product 1 has the edge wall 11 formed by drawing the peripheral portion of a metal sheet 10. The edge wall 11 has three slits 12 at a specified interval so as to have a depth h2 within the range from 40 to 90% of the height h1 of the edge wall 11. Because surplus portions produced in drawing the edge wall 11 are absorbed by the slits 12, the thickness t1 of the edge wall 11 is uniformly formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a press-processed product having an edge wall formed on the outer periphery.

In a press-processed product in which an edge wall is formed on the periphery, the edge wall may be formed by drawing.
In such drawing processing in forming an edge wall, when the peripheral edge of the workpiece is bent, a surplus portion (excess portion) of the material is generated, so that wrinkles may occur on the edge wall.

For this reason, conventionally, in order to prevent wrinkles from occurring at the time of forming the edge wall, there has been a case where an excessive portion generated by the drawing process is stretched. For example, in the invention described in Patent Document 1, after the edge wall is drawn, ironing is performed on the edge wall, thereby extending the surplus portion and reducing the thickness of the member of the edge wall and generating wrinkles. Is suppressed.
JP-A-8-168828

  However, the surplus portion generated during the drawing process does not occur evenly over the entire edge wall, and occurs in an uneven state. Therefore, it is difficult to uniformly apply the pressing force of the ironing process performed together with the drawing process to the entire edge wall. As a result, the stress acting with the ironing of the edge wall also becomes non-uniform in the flat portion continuous to the edge wall. Therefore, there is a problem in that the flat portion inside the edge wall is unevenly warped and does not become flat.

  In addition, the conventional press working method requires time and labor for drawing the edge wall and drawing and squeezing the peripheral edge of the metal plate, which requires at least two press workings. It was.

  The present invention has been made to solve the above-described problems, and it is possible to easily form an edge wall without requiring labor, and a flat portion continuous to the edge wall is formed flat. The subject is to propose a pressed product.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a press-processed product in which an edge wall is formed by drawing a peripheral edge of a workpiece, and the edge wall includes the edge wall. A slit having a length shorter than the height is formed.

  The invention according to claim 2 is the press-worked product according to claim 1, wherein the length of the slit is formed within a range of 40% to 90% of the height of the edge wall. It is characterized by that. Here, the larger the slit, the greater the effect of suppressing shape deformation such as warping, but conversely, when the slit is too large, for example, when used as a housing or container, the rigidity and sealing properties of the edge wall Decreases. Therefore, the size of the slit is formed within the range of 40% or more and 90% or less of the height of the edge wall in accordance with the functions required for the part, such as shape accuracy, rigidity, and sealing property.

  The invention according to claim 3 is the press-worked product according to claim 1 or 2, wherein the maximum width from the center to the edge wall is 25 times or more of the member thickness before processing of the workpiece. It is characterized by being in the range of 700 times or less. It should be noted that if the maximum dimension of the pressed product is smaller than 25 times the thickness of the material before processing the workpiece, there is sufficient rigidity to suppress deformation against the strain generated by the pressing, and therefore according to the present invention. It is possible to obtain the required accuracy regardless of whether it is a pressed product. On the other hand, if it is larger than 700 times, it is difficult to suppress warping as required for precision parts.

  Invention of Claim 4 is a press-work product of any one of Claim 1 thru | or 3, Comprising: The height of the said edge wall is the member thickness before the process of the said to-be-processed material. It is characterized by being in the range of 3 times to 25 times. If the height of the edge wall is smaller than 3 times the thickness of the workpiece before processing the workpiece, depending on the shape of the pressed product, the rigidity due to the thickness and size of the member is high, and the edge wall can be molded. There is a high possibility that the accuracy will decrease. On the other hand, when it is larger than 25 times, problems such as warpage and deformation tend to increase, making it difficult to ensure the required accuracy.

  The invention according to claim 5 is the press-worked product according to any one of claims 1 to 4, wherein a member thickness of the workpiece before processing is 0.5 mm or less. It is a feature. In addition, the press-work product which concerns on this invention exists in the tendency for the effect which reduces curvature to become large when the member thickness of a workpiece is thinner. Therefore, it is effective when the member thickness before processing of the workpiece is 0.5 mm or less, preferably 0.3 mm or less, more preferably 0.25 mm or less.

  In such a pressed product, since slits are provided in the edge wall, in the drawing process when forming the edge wall, excessive portions of the material are absorbed by the slit, and unevenness and wrinkles in the member thickness may occur in the edge wall. Absent. For this reason, since the uniformity of the member thickness of an edge wall is maintained, it becomes possible to apply the pressing force at the time of press processing uniformly with respect to an edge wall. Therefore, since the stress acting on the flat portion continuous inside the edge wall is uniform, the warpage of the flat portion is reduced as compared with the conventional case, and the flatness is well formed, which is preferable. In addition, it is possible to omit the labor of ironing for the purpose of extending the wrinkles that occur due to the occurrence of the surplus portion with respect to the edge wall.

  Since the press-processed product of the present invention has small warpage and good flatness, it can be suitably used as a member for precision parts and the like. In addition, since it is possible to easily form the edge wall without requiring labor, the manufacturing time and the manufacturing cost can be reduced.

The best mode for carrying out the present invention will be described in detail with reference to the drawings. In the present embodiment, a case where a part of a cartridge that stores a magnetic medium, more specifically, a shutter member of the cartridge is molded as a press-processed product will be described.
In the drawings to be referred to, FIG. 1 is a view showing a pressed product according to the present embodiment, wherein (a) is a perspective view, (b) is an enlarged sectional view, and (c) is an enlarged view showing a slit of an edge wall. FIG. 2A and 2B are diagrams showing the usage status of the press-processed product shown in FIG. 1, wherein FIG. 2A is a perspective view, and FIGS. 2B and 2C are enlarged views showing a part thereof. FIGS. 3A to 3C are cross-sectional views showing respective construction stages of the drawing method according to the present embodiment. In addition, drawing is a conceptual diagram, Comprising: It was not drawn according to the actual scale.

  As shown in FIG. 1A, the press-work product 1 according to the present embodiment has an edge wall 11 formed by drawing the periphery of a metal plate 10 that is a workpiece. A plurality of slits 12 are formed in the edge wall 11 of the press-processed product 1 at predetermined intervals. Furthermore, a wedge-shaped cutout 15 is formed in the pressed product 1. Here, in the drawings, reference numeral 14 denotes a boss formed by performing a burring process on the center of the metal plate 10.

  Further, in the press-processed product 1, the maximum length (width) x from the center to the peripheral edge (edge wall 11) of the press-processed product 1 is the plate thickness before processing the metal plate 10 (member thickness t of the plane portion 13). It is molded in the range of 25 times to 700 times, preferably 50 times to 550 times (see FIG. 1B). In addition, the shape of the press-processed product 1 is not limited.

  In the present embodiment, the metal plate 10 having a plate thickness (member thickness) of 0.5 mm or less, preferably 0.3 mm or less, more preferably 0.25 mm or less is used. In addition, the plate | board thickness of the metal plate 10 is not limited to the said range.

  As shown in FIG. 1B, the edge wall 11 is formed in a state in which it is erected substantially at a right angle with respect to the flat surface portion 13. The member thickness t1 of the edge wall 11 is formed slightly smaller than the member thickness t of the metal plate 10 in the flat portion 13 (70% to 95% of the member thickness t of the flat portion 13). Further, the height h1 of the edge wall 11 is formed to be 3 to 25 times, preferably 4 to 18 times the member thickness t of the plane portion 13. Here, in the press-processed product 1 according to the present embodiment, the flat surface portion 13 is not subjected to press processing, and the member thickness t of the flat surface portion 13 maintains the plate thickness of the metal plate 10 before processing. It shall be. In the present embodiment, the member thickness t1 of the edge wall 11 is formed to be smaller than the member thickness t of the flat portion 13, but the member thickness t1 of the edge wall 11 is not limited.

  As shown in FIG. 1A, the slits 12 are formed in the edge wall 11 at three positions with a predetermined interval. Each slit 12 is a notch formed in a V shape with respect to the edge wall 11 as shown in FIG.

  The slit 12 according to the present embodiment is formed such that the depth (length) h2 thereof is 40% to 90%, preferably 50% to 80% with respect to the height h1 of the edge wall 11. Yes. Needless to say, the shape and size of the slit 12 are not limited.

As shown in FIG. 2A, the press-work product 1 constitutes a rotary shutter 2 by combining another press-work product 1 ′ from above. Similar to the press-processed product 1, the other press-processed product 1 ′ is obtained by forming the edge wall 11 by drawing the peripheral edge of the metal plate 10 that is a workpiece. A plurality of slits 12 are also formed at predetermined intervals on the edge wall 11 of the other pressed product 1 ′. Further, a cutout 15 having the same shape as that of the press-processed product 1 is formed in the other press-processed product 1 ′.
In addition, since the structure of the edge wall 11 and the slit 12 formed in other press-processed products 1 'is the same as the structure of the edge wall 11 and the slit 12 of the above-mentioned press-processed product 1, detailed description is abbreviate | omitted.

  The rotary shutter 2 is configured by combining the edge walls 11 of the press-processed product 1 and the other press-processed product 1 ′ so as to overlap each other. In the present embodiment, the edge wall 11 of the other pressed product 1 ′ is configured to be disposed outside the edge wall 11 of the pressed product 1.

  The rotary shutter 2 has a magnetic medium 3 disposed in a space formed between the press-processed product 1 and another press-processed product 1 ′, and the magnetic medium 3 is opened from the opening formed by the notches 15 and 15. The medium 3 is configured to desire the outside.

  Since the depth h2 of the slit 12 formed in the edge wall 11 is smaller than the height h1 of the edge wall 11 (40% to 90%, preferably 50% to 80%), FIG. As shown in b) and (c), the edge wall 11 is overlapped with each other so that the opening by the slit 12 is not formed and can be accommodated in the other edge wall 11. For this reason, impurities such as dust are prevented from entering the rotary shutter 2 from the slit 12. The slits 12, 12,... Formed in the edge wall 11 of the press-processed product 1 and the edge wall 11 of the other press-processed product 1 ′ are a combination of the press-processed product 1 and the other press-processed product 1 ′. In this state, the slits 12 are formed at positions where they do not overlap each other.

Next, the drawing method according to the present embodiment will be described with reference to the drawings.
This embodiment demonstrates the case where the edge wall 11 is shape | molded on the periphery of the metal plate 10 (press processed goods 1), as shown to Fig.1 (a). The shape of the edge wall 11 is not limited to a circular shape, and can be appropriately formed into an arbitrary shape according to the purpose of use of the press-processed product 1.

  In the present embodiment, the die 21 formed in a convex shape along the shape of one surface of the edge wall 11 of the designed press-work product 1 and the concave shape along the shape of the other surface of the edge wall 11. The press-worked product 1 is formed using a press die 20 having the formed punch 22 and a stripper 23 that sandwiches the workpiece together with the die 21.

  Here, as shown to Fig.3 (a), the die | dye 21 is being fixed to the convex shape in the state protruded from the bottom face of the recessed part 24a formed in the die plate 24. FIG. The press die 20 according to the present embodiment is configured such that the die 21 can be changed, and the die 21 formed in a desired shape is arranged according to the shape of the designed press-work product 1.

  Further, the die 21 has a shape corresponding to the shape of the edge wall 11 (see FIG. 1A) of the designed press-work product 1. Note that the die 21 according to the present embodiment is formed in a substantially circular cylindrical shape in plan view. A pair of protrusions 21a and 21a are formed on the periphery of the surface of the die 21 on the stripper 5 side at positions facing each other. In addition, a substantially circular recess 21b is formed at a substantially central portion of the die 21 so that the boss 14 formed in advance on the metal plate 10 is not deformed during the drawing process. In addition, the material which comprises the die | dye 21 is not limited, What is necessary is just to select suitably from the well-known material which has the intensity | strength which does not deform | transform by the press work of the metal plate 10, and uses. Moreover, the recessed part 21b of the die | dye 21 is formed as needed, and does not necessarily need to be formed. Also, the shape of the die 21 is not limited to a circular shape in plan view, and may be formed according to the shape of the press-worked product 1 that is appropriately designed, such as a rectangle, an ellipse, and other polygons.

  The protrusion 21a formed on the die 21 has a shape if the protrusion 21a and the stripper 23 can firmly hold the metal plate 10 so that the metal plate 10 is not displaced during drawing. The arrangement is not limited. Moreover, the protrusion 21a should just be formed as needed, and does not necessarily need to be formed.

  As shown in FIG. 3A, the punch 22 is a steel member having a concave portion 22a and having a shape in which the cross-sectional view is substantially inverted, and the die 21 can be inserted into the concave portion 22a. It is formed in a simple shape. In this embodiment, a clearance with a width of 70% to 95% of the member thickness t of the metal plate 10 before processing is formed between the periphery of the die 21 and the inner wall surface of the recess 22a of the punch 22. The shape of the punch 22 is not limited, and may be set as appropriate according to the shape of the die 21 and the edge wall 11 of the designed press-work product 1. Further, the clearance width between the die 21 and the punch 22 is not limited.

  In this embodiment, the punch 22 is lowered from above the metal plate 10 so that the metal plate 10 is drawn. However, it goes without saying that the punch 22 may be raised from below. The moving direction of the punch 22 is not limited.

As shown in FIG. 3A, the stripper 23 comes into contact with the metal plate 10 from the surface opposite to the contact surface with the die 21 of the metal plate 10, and holds the metal plate 10 with the die 21. It is a plate-like material. The stripper 23 is disposed in the recess 22a of the punch 22 and is fixed to the punch 22 via an elastic member 23a such as a spring. Thereby, the punch 22 can be lowered while the stripper 23 presses the metal plate 10 from the upper surface.
Needless to say, the configuration of the stripper 23 is not limited as long as the metal plate 10 can be firmly fixed by gripping with the die 21.

  In the drawing method according to this embodiment, the metal plate 10 is fixed by bringing the stripper 23 into contact with the upper surface of the metal plate 10 arranged on the upper surface of the die 21 and the arrangement step of arranging the metal plate 10 on the die 21. And a drawing step for forming the edge wall 11 by pushing the punch 22 into the periphery of the fixed metal plate 10.

<Arrangement process>
The placement step is a step of placing the metal plate 10 with the bosses 14 formed on the surface of the die 21 as shown in FIG. At this time, the metal plate 10 is disposed in a state where the boss 14 is inserted into the recess 21 b formed in the center of the die 21. At this time, a plurality of slits 12 shallower than the height of the edge wall 11 designed in advance are formed at a predetermined interval on the periphery of the metal plate 10.

  In the arranging step, the stripper 23 is arranged at a position raised together with the punch 22, and a gap is formed between the stripper 23 and the die 21 so that the metal plate 10 can be moved.

<Fixing process>
In the fixing step, as shown in FIG. 3 (b), the stripper 23 is pressed against the upper surface (surface opposite to the die 21 side) of the metal plate 10 disposed on the upper surface of the die 21. 1 is a process of holding and fixing the metal plate 10. At this time, the metal plate 10 is firmly fixed by the protrusions 21 a formed to face each other at the periphery of the die 21.

  The metal plate 10 is fixed by lowering the stripper 23. As the stripper 23 descends, the stripper 23 comes into close contact with the metal plate 10 without a gap. In this embodiment, as the stripper 23 is lowered, the punch 22 is also lowered, and the lower end of the punch 22 is in contact with the upper surface of the metal plate 10. Needless to say, in the fixing step, only the stripper 23 may be lowered without lowering the punch 22.

<Drawing process>
In the drawing process, as shown in FIG. 3C, the peripheral edge of the metal plate 10 fixed by the fixing process by pushing the punch 22 into the groove formed between the peripheral edge of the die 21 and the die plate 24. This is a process of drawing. The punch 22 forms the edge wall 11 by pressing and bending the peripheral portion of the metal plate 10 protruding from the peripheral edge of the die 21 downward. At this time, the clearance between the die 21 and the punch 22 is formed to be smaller (70% to 95%) than the member thickness t of the metal plate 10, so that the periphery of the metal plate 10 extends along the periphery of the die 21. In addition, the drawing is performed while the edge wall 11 is squeezed by the inner wall surface of the recess 22 a of the punch 22 and the outer peripheral surface of the die 21.

  When the drawing process is performed, the surplus portion of the metal plate, which is generated by pushing and bending the peripheral portion of the metal plate 10, is absorbed by flowing into the slit 12 formed in advance on the periphery of the metal plate 10. For this reason, uneven thickness and wrinkles do not occur on the edge wall 11.

  As described above, according to the press-processed product according to the present embodiment, the slit 12 is formed in the edge wall 11, so that the surplus portion of the material accompanying the drawing is absorbed by the slit 12, and the uniform member thickness t <b> 1 is obtained. The edge wall 11 can be formed. For this reason, at the time of drawing of the edge wall 11, a high-quality press-worked product 1 in which a desired flatness is ensured without forming non-uniform stress on the flat portion 13 continuous to the edge wall 11 is formed. Making it possible.

  In addition, since the non-uniform surplus portion is not formed on the edge wall 11, it is possible to omit the trouble of separately ironing the edge wall 11, and the press-work product 1 can be easily formed. Is possible.

  In addition, since the slit 12 formed in the edge wall 11 is formed shallower than the height h1 of the edge wall 11, a predetermined member (rotary shutter 2) is configured with the edge walls 11 overlapped with each other. In addition, the slit 12 fits in the edge wall 11 and can be sealed so that impurities or the like do not enter from the slit 12.

  Further, since the clearance between the die 21 and the punch 22 is slightly smaller than the plate thickness t of the metal plate 10 in the press die 20, the peripheral edge of the metal plate 10 is reduced when the edge wall 11 is drawn. In order to process while squeezing, the member thickness t1 and the height h1 of the edge wall 11 are formed to be constant.

  Further, since the press die 20 is the upper surface of the die 21 and the protrusions 21a and 21a are formed on the periphery thereof, when the metal plate 10 is firmly fixed and the pressing force is applied by the punch 22 Further, the metal plate 10 does not move. For this reason, the metal plate 10 is prevented from flowing into the outside of the die 21 together with the processing of the punch 22, and the height h1 of the edge wall 11 is formed to be constant.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, the material of the workpiece is not limited, and a material according to the purpose of use of the press-processed product may be selected and used as appropriate from known materials. For example, stainless steel SUS304-SP, aluminum (Al), stainless steel SUS304-CSP, or the like can be used.

Needless to say, the press die may be used as an individual die or as a part of a progressive die.
In the above embodiment, in FIGS. 1, 2 and 4, for the sake of explanation, the slit after processing is clearly shown, but before drawing so that almost no gap is formed in the slit after drawing. The size of the slit to be formed may be adjusted, whereby the rigidity and sealing performance of the edge wall can be improved.

  Furthermore, in the above-described embodiment, the case where the part of the cartridge that stores the magnetic medium, more specifically, the case where the shutter member of the cartridge is molded as the press-processed product has been described. Needless to say, etc. are not limited. For example, the edge of a circular press-processed product 1a having an edge wall 11 on the periphery shown in FIG. 4A, a substantially horseshoe-shaped press-processed product 1b combining a rectangle and a semicircle shown in FIG. If the slits 12 are provided in advance on the peripheral edge of the metal plate in the same manner as in the above-described embodiment, the occurrence of warpage of the flat surface portion 13 is reduced, and high-quality press-work products 3 and 4 can be formed. Become.

It is a figure which shows the press work goods which concern on this embodiment, Comprising: (a) is a perspective view, (b) is an expanded sectional view, (c) is an enlarged view which shows the slit of an edge wall. It is a figure which shows the use condition of the press work goods shown in FIG. 1, Comprising: (a) is a perspective view, (b) And (c) is an enlarged view which shows the one part. (A)-(c) is sectional drawing which shows each construction step of the drawing method which concerns on this embodiment. (A) And (b) is a perspective view which shows the modification of a press-work product.

Explanation of symbols

1 Press-processed product 10 Metal plate (work material)
11 Edge wall 12 Slit 13 Planar part t Thickness (member thickness)

Claims (5)

A press-work product in which an edge wall is formed by drawing the peripheral edge of a workpiece,
A press-processed product, wherein a slit having a length shorter than the height of the edge wall is formed in the edge wall.   2. The press-worked product according to claim 1, wherein a length of the slit is formed in a range of 40% to 90% of a height of the edge wall.   3. The press according to claim 1, wherein the maximum width from the center to the edge wall is in a range of 25 to 700 times the thickness of the workpiece before processing the workpiece. Processed goods.   The height of the edge wall is in the range of 3 to 25 times the thickness of the member before processing of the workpiece, 4. Pressed products.   The press-worked product according to any one of claims 1 to 4, wherein a member thickness of the workpiece before processing is 0.5 mm or less.

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