JP3782853B2 - Manufacturing method of multi-perforated metal plate in punch press apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a multi-perforated metal plate for passing, for example, a copper pipe of a heat exchanger by a punch press apparatus.
[0002]
[Prior art]
When manufacturing a multi-perforated metal plate A ′ as shown in FIG. 4 by a punch press apparatus, conventionally, as shown in FIG. 5, first, a predetermined number of holes h are punched in the metal plate M, Next, as shown in FIG. 6, punching is performed on the outer periphery of the hole h group, leaving an appropriate number of narrow microjoints j (two in the left and right in the example in the figure) so that the processed portion does not leave the metal plate M. After drilling the narrow grooves s by the above method, a method has been adopted in which the joint j is removed to form a multi-perforated metal plate A ′. That is, the manufacturing process was performed in the order of FIG. 5, FIG. 6, and FIG.
[0003]
However, in the conventional method, as shown in FIG. 7, when the punch P and the die D are punched, the metal plate M is warped in the punching direction (see the arrow in FIG. 7), and the outer peripheral portion is lifted. A warp remained in the multi-perforated metal plate A ′ that should be flat, and an excellent product could not be obtained. In some cases, the warpage gradually increases during drilling, and the material to be processed cannot pass between the upper and lower molds. A lot of scratches were caused by the upper and lower molds on the upper and lower surfaces of the material, which was a problem.
[0004]
[Problems to be solved by the invention]
In view of the prior art as described above, the present invention provides a method for producing a multi-perforated metal plate with very little warp even if it remains after processing by a punch press apparatus. That is the subject.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the structure of the manufacturing method of a multi-perforated metal plate of the present invention is a multi-hole punching device equipped with a punch for punching and a die. When manufacturing a multi-perforated metal plate punched and perforated, the metal plate material is provided with a narrow groove that leaves at least a joint portion at an appropriate width and surrounds the outer periphery of the processing region where the hole is to be perforated. Then, an elongation absorbing groove having an appropriate width and an appropriate length is formed outside the narrow groove including the joint portion, and then a plurality of holes are punched and formed in the processing region to cut the joint portion. It is characterized by this.
[0006]
That is, the method according to the present invention includes, before perforating a metal plate material, a narrow groove having an appropriate width surrounding the outer periphery of the processing region and leaving at least both side grooves wider than the conventional micro joint, and the joint portion. So as to absorb the elongation generated in the metal plate material during punching and reduce the warpage generated in the multi-drilled metal plate of the product. To do. Note that the elongation absorbing grooves can absorb not only the elongation of the metal plate material due to punching but also the shrinkage due to the drawing.
[0007]
Further, the method of the present invention is characterized in that after the drilling in the above aspect, a plurality of holes are drilled while correcting the warp by using a warp correcting punch and a die for correcting the warp surrounding the punched hole. It is what.
[0008]
Normally, warping occurs when a large number of holes densely formed in a metal plate material are punched by a punch press. This is because the metal plate material is strongly pressed between the upper die and the lower die to punch holes, so that the metal plate material to be processed is slightly extended by the action of this pressing force, but densely packed When a large number of holes are drilled, the amount of expansion of the dense portion increases, and the force to expand increases, and the force to expand appears to be warped because it is confined in the outer periphery of the drilled portion. It is. That is, the above warp appears in the metal plate material as a difference in elongation between the perforated portion and the outer peripheral edge surrounding the portion, and does not constrain the force to be generated at the portion during perforation. If it is opened freely, warping will not occur or it should be considerably suppressed.
[0009]
However, in the conventional drilling method, a predetermined number of holes are formed in the metal plate material, and then a narrow groove is drilled and the metal plate material is formed and cut. Therefore, when each hole is drilled, the force extending to the outer peripheral edge of the plate material is increased. Although the size is also very large, the force to be stretched at the site to be drilled is the same as that restrained by the large force, and thus the warpage is large. The method of the present invention comprises a narrow groove having a joint portion left at least in a corresponding groove with an appropriate width that surrounds a slightly larger outer circumference that is the same size as the size to be cut and cut before drilling a metal plate material, and the joint portion. By perforating a groove having an appropriate width and length on the outer side of the narrow groove to be included, the size of the outer peripheral edge is reduced and the restraining force is reduced. This also absorbs the amount of elongation at the site where the narrow groove is perforated.
[0010]
Thus, the number and width of the joint portions to be left in the narrow grooves are appropriately selected according to the size and shape of the multi-perforated metal plate to be manufactured, or the shape and thickness of the metal plate in the processing area, and the elongation. The width and length of the absorption groove are appropriately selected according to the width of the joint portion of the narrow groove and the distance between the narrow groove. On the other hand, the shape of the multi-perforated metal plate is generally a rectangular shape, but there are an indefinite shape and a shape that is not entirely punched, but the present invention is also applicable to those.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a state in which a discontinuous narrow groove leaving a portion to be a joint portion on the outer periphery of a portion to be punched of a metal plate as a material and outer grooves positioned on the left and right outer sides of the narrow groove are formed. 2 is a plan view of a state in which a number of holes are drilled in the portion to be drilled from the state of FIG. 1, and FIG. 3 is a state in which a number of perforated metal plates are formed by cutting the joint portion from the state of FIG. It is a top view.
[0012]
1 to 3, 1 is a metal plate that is a material, 2 is a processing region in which a plurality of perforated metal plates are to be formed in the metal plate 1, and 3 is to surround the outer periphery of the processing region 2 in the metal plate 1. The joint portions 4 and 4 are formed by leaving the discontinuous portions with appropriate widths in the left and right intermediate portions of the narrow grooves 3 with the narrow grooves formed. The joint parts 4 and 4 connect the base material part and the product part. However, the joint part is weak in the size of the conventional micro joint, so it breaks at the time of drilling, or the base material is X In addition to breaking when positioning in the Y direction, when positioning this base material in the X, Y direction, the positional relationship between the base material part and the product part will be different, resulting in poor accuracy. The joint is wider than the conventional micro joint. Reference numerals 5 and 5 denote elongation absorbing grooves formed on the outside of the side of the metal plate 1 where the joint portions 4 and 4 of the narrow groove 3 are formed. The grooves 5 are formed by punching with a punch press device.
[0013]
Thus, in the present invention, holes 6 having a predetermined size and number are punched and formed by the punch press device in the processing region 2 of the metal plate 1 in which the narrow groove 3, the joint portion 4, and the groove 5 are formed as described above. Thereafter, by cutting the joint portions 4 and 4, the intended multi-perforated metal plate A is obtained.
[0014]
In the multi-perforated metal plate A manufactured as described above, since the elongation generated in the metal plate 1 when the hole 6 is punched is absorbed by the narrow grooves 5 or 3 and 5, the metal plate 1 in the punching direction. However, the distortion of the warped (or bulging) form is extremely reduced, resulting in a product with excellent quality. Therefore, for example, it is suitable as a porous plate used for passing a large number of copper pipes in a heat exchanger.
[0015]
In the above example, the two joint portions 4 and 4 are provided in the substantially intermediate portion on the left and right sides of the narrow groove 3, but the present invention is not limited to this, and the size of the multi-perforated metal plate A, Depending on the shape, more may be provided. Further, as described above, the width of the narrow groove 3 is appropriately selected depending on the size and thickness of the multi-perforated metal plate A to be manufactured, and the width and length of the elongation absorbing groove 5 are the narrow groove. 3 is selected as appropriate depending on the width of the joint portion 4 and the distance to the narrow groove 3.
[0016]
In the present invention, when the holes 6 are punched in a lattice shape, they are punched alternately left, right, top and bottom from the inside of the processing region 2, preferably from the center toward the left, right or top and bottom. In order to reduce the warp, it is effective that the elongation of the metal plate 1 by punching is directed to the outside of the processing region. Further, by punching outward, the metal plate 1 is drilled after the metal plate 1 is stretched by the previous punching, so that the accuracy of the hole position is improved.
[0017]
In the above-described drilling step, the present invention may take a processing mode of proceeding to the next drilling step while correcting the warping of the perforated hole 6 of one to several rows. That is, FIG. 8 shows a cross section of an example of a warp correction state. In this figure, 11 is a punch having an outer shape slightly larger than the hole 6 drilled in the metal plate 1, and 12 is extrapolated to the punch 11. And an upper plate 16 formed on the bulging surface of the upper surface held together with the punch 11 in the punch holder 15 while being urged upward via an elastic body by a spring 13 or a shim 14. The hole 6 of the metal plate 1 in which the hole 6 is formed by a die having a recess having a diameter sufficiently larger than the outer shape of the punch 11 disposed above the punch 11 with the metal plate 1 interposed between the hole 11 and the punch 11. Is placed on the punch 11 and the die 16 is pushed down from above to cause the upper plate 12 to sink together with the metal plate 1 surrounding the hole 6, and warp of the hole 6 in the metal plate 1 is caused. Modified by the cooperative action of punch 11 and die 16 You have me.
[0018]
Next, when the processing region 2 of the metal plate 1 has, for example, an elongated shape with a small vertical width and wide left and right, the distance of each hole 6 adjacent to the upper and lower narrow grooves 3 to the narrow groove 3 By making the same, it is desirable to make the extension of the metal plate 1 left and right by punching perforation uniform and to prevent the metal plate 1 from bending.
[0019]
Further, if a large number of holes 6 are drilled in the processing region 2 of the metal plate 1, the plate 1 extends to increase the outer dimension of the processing region 2 (this point is reduced by the drawing), so that the product dimensions can be adjusted. It is better to perform the processing after drilling, including cutting of the joint portion 4.
[0020]
【The invention's effect】
The present invention is as described above, and when a multi-perforated metal plate is manufactured by punching and punching a large number of holes at appropriate intervals from a metal plate material by a punch press device, the holes should be drilled in the metal plate material. Prior to punching and punching, a narrow groove is provided prior to punching, and is provided outside the narrow groove including the joint portion, with an appropriate width surrounding the outer periphery of the processing region and at least at the center of both sides, leaving a joint portion wider than the micro joint in the conventional method. In the punching process of a large number of holes, a plurality of holes are punched and punched in the processing region after forming an appropriate width and length of an elongation absorbing groove, and the outer shape is formed and cut. The surface of the resulting metal plate is warped or the distortion of the form that swells in the punching direction is reduced, and not only a high-quality multi-perforated metal plate can be manufactured, but also the positional accuracy of the perforation can be improved.
[0021]
Further, in the present invention, after drilling one or more rows of holes, it is possible to manufacture a multi-perforated metal plate with less distortion by correcting the warpage of the surrounding holes and proceeding to the next step. It is.
[0022]
Furthermore, in the present invention, it is possible to perform processing that is unlikely to be warped by a large number of perforations by devising the order of drilling the holes in each row and the width of the narrow grooves. Useful.
[Brief description of the drawings]
FIG. 1 is a plan view of a state in which a narrow groove that leaves a portion that becomes a joint portion on the outer periphery of a portion to be punched of a metal plate and outer grooves that are positioned on the left and right outer sides of the narrow groove are formed by the method of the present invention. .
FIG. 2 is a plan view of a state in which a number of holes are formed in a portion to be drilled from the state of FIG.
3 is a plan view showing a state in which a plurality of perforated metal plates are formed by cutting joint portions from the state shown in FIG. 2;
FIG. 4 is a plan view of a multi-perforated metal plate.
FIG. 5 is a plan view showing a state in which a number of holes are formed in a metal plate by a conventional method.
6 is a plan view of a state in which narrow grooves including micro joints are formed on the outer periphery of the hole group from the state of FIG. 5;
FIG. 7 is a cross-sectional view illustrating a state in which warpage occurs in the surrounding of a hole during punching.
FIG. 8 is a cross-sectional view illustrating a state in which warpage of a hole is corrected by the method of the present invention.
[Explanation of symbols]
1 Metal plate 2 Processing area 3 Narrow groove 4 Joint part 5 Elongation absorbing groove 6 Hole

Claims (5)

When manufacturing a large number of perforated metal plates by punching and punching a large number of holes from a metal plate material at appropriate intervals by a punch press device equipped with a punch and die for drilling, the holes are drilled in the metal plate material. A narrow groove with an appropriate width surrounding the outer periphery of the machining area to be left and at least a groove facing each other, and a groove for absorbing an extension having an appropriate width and length outside the narrow groove including the joint portion And then punching and punching a large number of holes in the processing region. A method for producing a multi-perforated metal plate in a punch press apparatus. The punch has a punch and die set for punching, and has a punch having an outer shape slightly larger than the inner shape of the hole to be processed by the punch, and is energized by an elastic body that is externally attached to the punch and is large in the normal state. A punch holder holding a workpiece mounting plate or a workpiece holding plate projecting downward from the outer shape punch and recessed from the surface of the large outer shape punch under pressure. In the punch press machine comprising a punch for correcting warpage of a punching hole, and a die set comprising a die provided with a recess having an inner shape larger than the outer shape of the punch on the surface of the outer punch, the punch for punching When a large number of holes are punched into a metal plate by using a die and a die is punched and drilled in one or several rows of holes, the above-described holes for punching using the warp correcting punch and die set are used. Anti-enclosure Method for producing a multiple perforated metal plate of a punch press apparatus according to claim 1, characterized in that to correct. The metal plate material according to claim 1 or 2, wherein when punching a plurality of holes in a lattice shape, the holes are alternately punched in the outer direction facing one or several rows from the inside to the outside of the processing region. A method of manufacturing a multi-perforated metal plate in a punch press apparatus. 4. The method according to claim 1, wherein when the processing region of the metal plate material is an elongated shape, the width of the hole row adjacent to the narrow groove and the width to the narrow groove are made uniform to make the elongation due to the perforation uniform and suppress the bending. A method for producing a multi-perforated metal plate in the punch press apparatus according to claim 1. The method for producing a multi-perforated metal plate in a punch press apparatus according to any one of claims 1 to 4, wherein an outer shape is formed after punching a large number of holes in the metal plate material.

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