JP3709898B2 - Press working method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressing method in which a plate material such as an iron plate is sequentially pressed by a plurality of molds, and in particular, various types of holes and cuts and cuts are formed in order to form a chassis and a frame. The present invention relates to a press working method suitable for use.
[0002]
[Prior art]
As an example of this type of press working, a case where a main frame of a magnetic disk driver is formed will be described with reference to FIG. FIG. 3 shows a workpiece to be pressed, and an iron plate wound in a roll shape is usually used. The work plate 30 is intermittently transferred in the direction indicated by the arrow in the drawing, and drilling, cutting, drawing, and the like are performed by a plurality of dies (not shown) arranged in series in the transfer path. Are performed sequentially. Such a processing method is called a progressive die.
[0003]
FIG. 3 shows an example in which drilling and cutting are performed. First, a plurality of types of holes 31 having different diameters are provided by a drilling die. In the next step, a U-shaped slit 32 is provided by a mold for making a cut for raising. In the next step, the cut-and-raised portion 33 is formed by a mold for raising the cut portion. Hereinafter, various press processes are similarly performed using various molds.
[0004]
In addition, the dashed-dotted line in FIG. 3 shows the outline cut off from the to-be-processed board 30, and this cutting off process is performed at the process close | similar to the last process. That is, a part cut off from the work plate 30 may be further subjected to a bending process or the like at the edge thereof.
[0005]
By the way, in progressive press processing, it is necessary to provide pilot holes 34 in the processed plate 30 in order to improve processing accuracy. The pilot holes 34 are used for feeding and positioning on the mold when the work plate 30 is transferred between a plurality of molds. That is, the pilot hole 34 is engaged with a pin provided on one of a pair of molds that move up and down so as to be sandwiched from above and below the workpiece plate 30, and is fed and positioned. Needless to say, the pilot hole 34 is provided using a mold in a process prior to the process of providing the hole 31.
[0006]
[Problems to be solved by the invention]
As apparent from FIG. 3, the pilot hole 34 has been provided outside the portion cut off from the work plate 30, that is, outside the outline indicated by the alternate long and short dash line. This means that the dimension in the width direction of the work plate 30 is increased by the amount for providing the pilot hole 34, and the material cost is increased.
[0007]
Accordingly, an object of the present invention is to provide a press working method that can eliminate waste of material costs caused by pilot holes.
[0008]
[Means for Solving the Problems]
The present invention includes a step of sequentially pressing with a plurality of molds arranged in series with respect to a work plate whose processing region is set within a predetermined contour, and cutting off at the contour. in pressing the progressive die, the provided position of the pilot hole provided for that feed the target plate, corresponding to the concave portion by utilizing the fact that there is a recess in front SL contour, engages the pilot hole Positioning and feeding are performed with the mold having pins at positions to be combined.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. In FIG. 1, the same parts as those in FIG. That is, a case will be described in which the same parts are made by drilling and raising the same as in FIG. 3 in the work plate 30 shown in FIG. In particular, in this example, attention is paid to the fact that the contour cut off from the work plate 30 has a concave and convex portion (here, the concave portion 35), and the pilot hole 11 is provided at a position corresponding to the concave portion 35. In this way, it is possible to minimize the dimension from the contour indicated by the alternate long and short dash line to both side edges of the processed plate 30, and as a result, it is possible to reduce the width dimension of the processed plate 30 and to minimize the waste of material. it can. This pilot hole 11 disappears from the parts cut off by cutting off the contour portion indicated by the alternate long and short dash line from the work plate 30 in a later step, but there is no problem. In addition, about a metal mold | die, the pin engaged with this should just be provided in the location corresponding to the pilot hole 11. FIG.
[0010]
In the example of FIG. 1, it is used that the contour cut off from the workpiece 30 has an uneven portion, but the contour does not necessarily have the uneven portion. In this case, as shown in FIG. 2, a pilot hole 11 ′ may be provided in a contour cut from the workpiece plate 30, that is, in a part.
[0011]
In any case, the pilot hole is located in the area where there is no problem even if there is a hole in the molded part, and the hole or cutting provided in the process where feed and positioning are no longer necessary. It may be a missing area. This position is determined at the design stage of the molded part, and a mold corresponding to this is prepared.
[0012]
【The invention's effect】
As described above, according to the present invention, the position of the pilot hole provided in the work plate is set in a region or region close to the contour cut off from the work plate, and a mold corresponding to this is prepared. As a result, it is possible to minimize the wasted space in the work plate, and as a result, it is possible to contribute to the cost reduction of the molded part.
[Brief description of the drawings]
FIG. 1 is a view showing a part of a plate to be processed during a processing step in order to explain the present invention.
FIG. 2 is a view showing a part of a plate to be processed when the present invention is applied to a molded part having a different contour from the molded part shown in FIG.
FIG. 3 is a diagram for explaining a conventional press working method.
[Explanation of symbols]
11, 11 ', 34 Pilot hole 30 Work plate 31 Hole 32 Slit 33 Cut and raised part 35 Recessed part

Claims (1)

A progressive die including a step of sequentially pressing with a plurality of molds arranged in series on a workpiece plate whose machining area is set within a predetermined contour, and cutting off at the contour. in press working, the provided pilot holes provided for that feed the target plate, before SL contour position corresponding to the concave portion by utilizing the fact that there is a recess in a position to be engaged with the pilot hole A press working method characterized in that positioning and feeding are performed with the mold having a pin on the die.

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