JP2014004606A - Metal mold for roll bending - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal mold for roll bending process that can simplify a metal mold replacement operation so as to reduce the entire operation time.SOLUTION: Female molds (20 and 20') are respectively comprised of base parts (21 and 21') and a plurality of leaf springs (22). A groove (23) or a recess (23') is formed on a female mold surface of each of the base parts of the female molds. The plurality of leaf springs are stacked one upon another on the female mold surface and are also mounted so as to cover the groove or the recess. A plate-shaped workpiece (30) is set on the leaf springs on the female molds. The plate-shaped workpiece is subjected to roll bending process owing to the fact that by a relative press operation between a male mold and the female mold, the plurality of leaf springs are elastically deformed with an elastic repulsive force capable of plastically deforming the plate-shaped workpiece.

Description

  The present invention relates to a round bending mold, and more particularly, to a mold that can simplify the replacement work of the mold and can shorten the entire work time.

  A roll bending method using a plurality of rolls is known for round bending of a metal plate (Patent Document 1, Patent Document 2), but it is necessary to control or operate the movement of the roll with high accuracy. The structure of the bending machine is complicated or requires the skill of the operator.

  On the other hand, a method is known in which a metal plate is set between male and female dies, and the metal plate is rounded by, for example, a press brake (Patent Document 3 and Patent Document 4).

  With this round bending method using a mold, it is difficult to bend to a predetermined radius at a time due to springback, etc., and the metal plate is gradually fed into the mold little by little while the round is bent little by little. Repeatedly bending to a predetermined radius is performed.

JP-A-06-339729 Japanese Utility Model Publication No. 07-37422 Japanese Patent Laid-Open No. 04-31424 JP-A-11-123461

  However, in the conventional bending method using a mold, it is necessary to prepare a large number of male and female molds having a size corresponding to the bending radius, and to change the male and female molds each time the dimensions of the bending process are changed. The replacement work is not only very complicated, but also increases the overall work time.

  In view of such problems, the present invention has an object to provide a round bending mold that can simplify the replacement work of the mold and shorten the entire work time.

  Accordingly, the round bending mold according to the present invention is a mold for bending a plate-like workpiece by a rounding operation between a male mold and a female mold. On the other hand, the female mold is composed of a base and a plurality of leaf springs, and the female mold base has a groove or a recess formed on the female mold surface, and the female mold has a groove or a recess formed on the female mold surface. A plurality of leaf springs are stacked and placed so as to cover the groove or recess, and the plate-like workpiece is set on the female leaf spring, between the male die and the female die. The plurality of leaf springs are elastically deformed with an elastic repulsive force capable of plastically deforming the plate-like workpiece by a relative pressing operation, whereby the plate-like workpiece is rounded. To do.

  One of the features of the present invention is that a plurality of leaf springs are laminated on the base so as to cover the groove or recess of the base, a plate-like workpiece is set on the leaf spring, and the plate is moved by pressing the male and female dies. The spring is elastically deformed to obtain a sufficiently large elastic repulsive force, and the plate-like workpiece is rounded between the male tip male surfaces.

  As a result, it is possible to cope with round bending of various dimensions by simply replacing the male mold with one having a dimension corresponding to the work bending radius, and it is not necessary to replace the female mold each time. Can be eliminated and the overall work time can be shortened.

  The number of leaf springs is not particularly limited as long as an elastic repulsive force capable of plastically deforming the plate-like workpiece can be obtained, and the number of leaf springs may be selected according to the elastic deformability of the leaf spring.

  Further, the plurality of leaf springs may be merely placed on the female mold surface, but in order to prevent the leaf spring from moving around during the bending work and deteriorating workability, it is adjacent to the top and bottom 2. One side of one leaf spring is cantilevered to one side of the female base and the other side of the other leaf spring is cantilevered to the other side of the female base. It is good.

  The female mold may be formed by forming an arc concave recess on the upper female mold surface of the block-shaped base, or may be configured by arranging the block-shaped halves of the base at intervals.

It is the schematic which shows preferable embodiment of the metal mold | die for round bending which concerns on this invention. It is a figure which shows typically the rounded bending process using the said embodiment. It is the schematic which shows 2nd Embodiment.

  1 and 2 show a preferred embodiment of a round bending mold according to the present invention. In the figure, the round bending mold is composed of a combination of a male mold 10 and a female mold 20, and the male mold 10 has a tip male mold surface 11 formed in a side surface arc shape having a radius equal to or less than ½ of a workpiece bending radius. Yes.

  On the other hand, the female mold 20 is composed of a base 21 and a plurality of leaf springs 22, and the base 21 of the female mold 20 is configured by arranging left and right block-shaped halves 21A and 21B with a space therebetween. A groove 23 having a predetermined width is formed between the portions 21A and 21B.

  A plurality of leaf springs 22 are stacked on the female die surface of the female die 20 so as to cover the groove 23, and one of the two leaf springs 22 adjacent to the upper and lower sides is one side portion. The other half of the other leaf spring 22 is fixed to one side of the base half 21A in a cantilevered manner with a bolt or the like, and the other side of the other half of the base half 21B is bolted to the other side of the other base half 21B. Is fastened in a cantilevered manner.

  When a round bending process is performed on the metal plate (plate-shaped workpiece) 30 using the mold of this example, the metal plate 30 is placed on the plate spring 22 as shown in FIG. The end portion is set to be above the groove 23, and the relative pressing operation between the male mold 10 and the female mold 20, for example, the male mold 10 is stroked downward to press the metal plate 30.

  Then, a plurality of leaf springs 22 are elastically deformed. At that time, an elastic repulsive force is generated in the leaf springs 22, and the end of the metal plate 30 is between the distal male surface 11 of the male mold 10 and the leaf springs 22. When sandwiched and plastically deformed and the male die 10 is stroked upward, the leaf spring 22 returns to its original state, and a predetermined small width portion of the end portion of the metal plate 30 is rounded.

  When the end of the metal plate 30 is rounded, the portion continuing to the end of the metal plate 30 is fed so as to be above the groove 23 as shown in FIGS. When a relative pressing operation is performed between the mold 10 and the female mold 20 to press the metal plate 30, a predetermined small width portion continuous to the end of the metal plate 30 is bent in the same manner as described above.

  In this way, when the rounded bending process is repeated while gradually feeding the metal plate 30 little by little, the metallic plate 30 can be bent to a predetermined radius as shown in FIG. However, (d) of FIG. 2 is an example in which the narrow rounded bending process is repeated twice.

  In the round bending mold of this example, it is possible to perform round bending with different bending radii by simply replacing the male mold 20 with different radii of the male surface 11, and when performing bending with various radii, the mold The troublesome replacement work can be eliminated, and the overall bending work time can be greatly shortened.

  FIG. 3 shows a second embodiment. In this example, an arc-shaped recess 23 ′ is formed on the female surface of the block-shaped base 21 ′ of the female mold 20 ′.

DESCRIPTION OF SYMBOLS 10 Male type | mold 11 Male type | mold surface 20,20 'Female type | mold 21,21' Base 22 Leaf spring 23 Groove 23 'Concave 30 Metal plate (plate-shaped workpiece)

Claims (5)

In a mold for round bending a plate-like workpiece by a press operation between a male mold and a female mold,
The male mold (10) has a male surface (11) at the tip formed in a circular arc shape, while the female mold (20, 20 ′) has a base (21, 21 ′) and a plurality of leaf springs ( 22), and the base (21, 21 ′) of the female mold (20, 20 ′) has a groove (23) or a recess (23 ′) formed on the female mold surface, and is formed on the female mold surface. Is stacked with the plurality of leaf springs (22) and covering the groove (23) or the recess (23 '),
The plate-like workpiece (30) is set on the leaf spring (22) of the female die (20, 20 ′), and the relative relationship between the male die (10) and the female die (20, 20 ′) is set. The plate work (30) is rounded by the plurality of leaf springs (22) being elastically deformed with an elastic repulsive force capable of plastically deforming the plate work (30) by a pressing operation. Earl bending mold characterized by what has been done.   The round bending die according to claim 1, wherein the male surface (11) of the tip of the male mold (10) is formed in a side surface arc shape having a radius of 1/2 or less of a work bending radius.   In the plurality of leaf springs, one of the leaf springs (22) of the two vertically adjacent plates is separated from one side of the base (21, 21 ') of the female die (20, 20'). 2. The R-bending gold according to claim 1, wherein the other leaf spring (22) is fixed in a cantilevered manner, and the other side of the other leaf spring (22) is fixed in a cantilevered manner on the other side of the female base (21, 21 '). Type.   The base (21) of the female mold (20) is configured by arranging left and right halves (21A, 21B) at an interval, and the groove (23) is formed between the left and right halves (21A, 21B). The round bending mold according to claim 1, wherein   The round bending mold according to claim 1, wherein an arc-shaped recess (23 ') is formed in the base (21') of the female mold (20 ').

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