JP3001419U - Cutting die for punching large polygonal holes in steel plates, etc. - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cutting die for punching a polygonal large hole in a steel plate or the like, which is a simple cutting for punching a straight line portion at a time when punching a polygonal large hole. [Structure] In a cutting die for punching a large hole under pressure on a steel plate or the like, a rectangular punch 1 having a predetermined angle for positioning and corner holes, which is formed at a corner b of a polygonal large hole area a, and the large hole area a. Of the plate-shaped mold body 2'having the length of the straight part c of the above, the leg-shaped guides fitted to the corner holes B opened at both ends of the straight side part and the receiving groove 8a of the lower mold 8. The shaft portions 3 and 3 are provided in a protruding manner, and the sheer angle 4
And a cutting edge 5 to form a straight side cutting die 2, and the straight side connecting the two corner holes B, B punched by the rectangular punch 1 is used as the both side corner holes B, B and the lower metal mold. Straight side cutting after guiding the guide shafts 3 and 3 reaching the mold 8 A straight slit is cut all at once by pressing the mold 2, and this straight slit is formed over each straight side of the large hole area to obtain a large hole. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention also relates to a cutting die for punching a large polygonal hole in a steel plate or the like that can easily make a large hole in a steel plate or the like using a small press machine or the like.

[0002]

[Prior art]

 Generally, NC machines are used to perform automatic drilling for forming large holes or punched shapes of a predetermined shape in flat plates with a certain thickness, such as steel plates, which are used in ironworks and press works. Equipment and large press machines are used. For example, in NC machine tools, square holes are used to make holes continuously in accordance with the movement of TSUKIATE in each process. For large press machines, punching dies matching the shape of the processed holes are prepared.

[0003]

[Problems to be solved by the device]

 In this case, since the vertical and horizontal dimensions can be freely set in the NC machine tool, one mold is sufficient (for example, a mold having an area of 20 mm × 20 mm). However, if the vertical and horizontal dimensions become large, the hole making process becomes large in proportion to the size (for example, a hole is about 400 mm × 250 mm, and 100 steps are required). For example, as shown in FIG. 6, when a large hole C like a window frame is opened in one steel plate A having a predetermined thickness, a lower die of a predetermined holder (which is arranged below using a single punch P) ( (Not shown), a small hole C'is punched, and this small hole C'is punched out in a straight line so that part of the hole is doubled, so-called punching is performed. Since the mark e of No. remains as a burr, a finishing work for scraping off with a file etc. is required at the end, and conversely, a great deal of labor must be paid.

When a large press is used, a male die (not shown) is fixed to the ram, a female die (not shown) is fixed to the bed, and a steel plate is inserted between them to press and punch. However, this makes the die expensive when the size of the hole becomes large, it is impossible to change the size of the hole, and a large size plate for inserting the processing plate is required depending on the opening position of the processing plate. There was a point.

As a simple type for use with a large press machine, a standard small round hole is made (about 5 mm), and a guide pin is passed through the hole to prevent the pin from galling with a male / female type. There is a punching method. In this case, the cut surface will be clean, but the dimensions of the hole cannot be changed, so a mold must be prepared for each hole of different dimensions. When the size of the hole becomes large, the pressing force also becomes large and the mold becomes large, and the weight becomes heavy. Although it is simple for each machining, it must be set, and there is a defect that a larger machined plate is required depending on the size of the machined plate and the position of the holes.

In view of the above situation, the present invention combines a partial punch at a corner position of a polygonal large hole and a linear punch connecting the two corner holes with a square punch and a straight side cutting die to form a predetermined large square hole. It is an object of the present invention to provide a cutting die for forming a large-diameter polygonal hole in a steel plate or the like that solves the above problems.

[0007]

[Means for Solving the Problems]

 The present invention relates to a cutting die for punching a large hole under pressure on a steel plate or the like, and a rectangular punch having a predetermined angle for positioning and corner hole, which is formed at a corner of a polygonal large hole area, and a straight side of the large hole area. On the lower surface of both ends of the plate-shaped mold body with the length of the part, projecting the corner holes opened at both ends of this straight side part and the leg-shaped guide shaft part that fits into the receiving groove of the lower mold, In addition, it is configured by a straight side cutting die in which a cutting edge portion with a shear angle is formed on the lower surface of the straight portion between the guide shaft portions.

Further, the cutting blade portion serves as a shearing angle cutting blade portion having a mountain height at the center.

[0009]

[Action]

 Due to the above-mentioned configuration, a square punch and a straight side cutting die are mounted on the upper table side of the press machine, and in a steel plate inserted between the upper and lower tables, a predetermined polygonal shape to be opened in the steel plate is used. Positioning the corners at both ends of the straight part of the large hole area, which is a large hole, directly below the rectangular punch with a predetermined angle and lowering it, the positioning and corner hole is punched out. Fit in the corner holes at both ends with the leg-shaped guide shafts at both ends of a plate-shaped straight side cutting mold having the length of the straight side, and the lower ends of the guide shafts are the lower molds on the lower table side. When the straight side cutting die is further lowered, a straight slit with a narrow width is cut on the line connecting the corner holes. This process (corner hole by square punch and straight side cutting die using these two corner holes to cut straight slit by die) is performed for each straight side part, and the straight side part is easily made as a whole. Large holes with polygons (squares, rectangles, pentagons, hexagons, etc.) will be made.

[0010]

【Example】

 The present invention will be described below with reference to the drawings of the embodiments.

The drawing shows a cutting die of an embodiment for punching a rectangular (quadrangular) large hole in a steel plate. 1 is applied to each corner b of a large hole area a corresponding to a predetermined rectangular large hole drilled in a steel plate A. This is a square punch for positioning and having a square hole, which has a rectangular punching blade portion 1a. Reference numeral 2 denotes a bottom surface of both ends of a plate-shaped die body 2'having a length of at least one straight side c of the large hole area a, which penetrates the corner holes B, B punched by the rectangular punch 1 and lowers the lower end. The leg-shaped guide shafts 3 and 3 that fit into the receiving grooves 8a of the die 8 are provided in a protruding manner, and a predetermined shear angle 4 is provided on the lower surface of the linear portion between the guide shafts 3 and 3. It is a straight side cutting die formed by forming the cutting blade portion 5. In this case, the shearing angle 4 of the cutting blade portion 5 has a structure having shearing inclinations 4a, 4a in which the central portion has a mountain height and both ends have a low height. As the straight-side cutting die 2 corresponding to the rectangular (rectangular) large hole, two types are prepared, one for the long side and one for the short side.

Explaining this action now, first, the rectangular punch 1 and the straight-sided cutting die 2 for positioning and corner holes are respectively provided on the upper table (not shown) of a known press machine (not shown) such as a press or a bender. (Not shown) attached to the predetermined holders 6 and 6. Further, lower dies 7 and 8 having a predetermined shape, which oppose the square punch 1 and the straight-side cutting die 2, are appropriately attached to a lower table (not shown) side.

Here, when punching a large hole C having a rectangular (square) shape like a window frame in a thin steel plate A (for example, a stainless steel plate having a thickness of 2 mm), the steel plate A is appropriately carried between the upper and lower tables. First, in forming the corner hole B to be drilled first, a rectangular large hole area a is set on the upper surface of the steel plate A (marked with a solid line or an imaginary line or a positioning point), and the position of this one corner portion b is positioned and used as a corner. It is set right below the rectangular punch 1 for holes, and in this state, the upper table is lowered and the steel plate A is punched with a predetermined pressure to punch a square corner hole B at this corner b. In this case, the punched steel plate piece falls off to the position of the receiving blade portion 7a of the lower lower die 7 as in the conventional press machine. After this, even in the remaining three corners b (in the case of a rectangle), the corner holes B are similarly drilled.

Next, when cutting the straight side portion c in the rectangular large hole area a of the steel plate A, first, an upper tee having a straight side cutting die 2 having a length commensurate with the straight side portion c which is the long side portion is mounted. Table is first lowered, and the guide shafts 3, 3 protruding from the lower ends of the straight side cutting die 2 are inserted into the facing corner holes B, B at both ends of the straight side c, respectively. At the same time (see FIGS. 2 and 5B), the tip ends of the leg-shaped guide shaft portions 3 are fitted and guided in the receiving groove 8a of the lower die 8 on the lower table side. At this time, the cutting blade portion 5 of the straight side cutting die 2 is still located on the upper surface of the steel plate A. After that, the upper table is secondarily lowered and the straight side cutting die 2 is used to cut between the corner holes B and B. When the straight steel plate portion is pressed, the straight side portion c is cut into the straight slit 9 having the width (narrow width) of the straight side cutting die 2. In this case, since the blade portion of the straight side cutting die 2 is provided with the shear angle 4, it is possible to perform the cutting work without extremely increasing the pressing force associated with the cutting. Moreover, this shear angle has a structure in which the center of the blade has a mountain height (a square V shape) and is inclined to both sides, so that a uniform cutting force is obtained on the left and right sides. Further, at the time of cutting the steel plate, the leg-shaped guide shaft portions 3, 3 at both ends of the straight-side cutting die 2 face the receiving groove 8a of the lower die 8 in advance and serve as guides for the lower blade portion 8a '. It does not invite so-called galling. The cut steel plate pieces fall into the receiving groove 8a of the lower mold 8. Since the straight-side cutting die 2 has a plate-like shape with a narrow width, a press machine or a bender that is forceless can work with a press machine that has an area where the die can be attached if only the length is taken into consideration. .

Next, the set position of the steel plate A is changed so that the straight side portion c on the opposite side (other side) to be parallel to the straight line slit 9 faces the position directly below the straight line side cutting die 2. Here, similarly, if the guide shaft portions 3, 3 at both ends of the straight side cutting die 2 are fitted into the receiving groove 8a of the lower die 8 from both corner holes B, B, and then pressure is applied, The linear slit 9 of the step is cut.

In the following, when cutting the straight side portion c of the short side portion of the rectangular large hole area a, a straight side cutting die 2 having a short length corresponding to the straight side portion c is selected and attached to the holder 6 of the upper table. You can use it. That is, in this case, the type of the straight-side cutting die 2 should have two types of dimensions corresponding to the length of the rectangular large hole area a and the straight side c of the short side. Here, similarly to the above, the guide shafts 3 and 3 at both ends of the short straight side cutting die 2 are provided with the corner holes B and B formed at the front and rear positions (in FIG. 5D) and the lower die 8 below. If the upper table is fitted into the groove 8a and the upper table is lowered to pressurize the steel plate portion between the corner holes B, B, the straight slit 9 of the short side is similarly cut. In this way, if the linear slits 9 are sequentially obtained for the respective linear portions c of the rectangular large hole area a, the rectangular large holes C can be easily formed as a whole.

As described above, the rectangular large hole C cuts the straight line portion by the single straight line side cutting die 2 at once, so that the number of times of pressure cutting is extremely small and the cut end is finished neatly. .

In the above embodiment, the large hole C is formed in the steel plate A with respect to the rectangular large hole. However, for example, if the large hole C is a punching type having a triangular shape, the rectangular punch 1 has the punching blade portion 1a. If the large hole C has a pentagonal shape (not shown), and the large hole C has a pentagonal shape, the punching blade portion 1a (not shown) of one square punch is pentagonal. The corner b of the polygonal large hole area a is punched by the rectangular punch 1 in the same manner as described above (not shown), and the straight slit 9 of the straight side c has a length corresponding to the straight side c. If the straight edge cutting die 2 is used, a large hole C such as a triangle or a pentagon can be easily punched.

Further, by combining the square punch 1 and the straight side cutting die 2, the notch cutting work or the like formed on the edge portion of the steel plate A can be easily performed.

[0020]

[Effect of device]

 As described above, the cutting die for punching a polygonal large hole in the steel plate or the like of the present invention has a rectangular punch for positioning and corner holes formed at the corner of the large hole area and a straight portion of the large hole area. A straight edge cutting die with a shearing angle cutting blade that protrudes the guide hole facing the bottom corner hole and the lower die is combined with the cutting die to create a square punch in the desired large square hole area. If you make a hole, you can use these two corner holes to easily position the straight edge cutting die, and you can cut the straight slit surely, and just form the straight slit for each straight portion of the large hole area. Large holes can be easily formed with. Moreover, in this case, since the guide shaft portions at both ends of the straight-side cutting die face the lower die in advance during cutting, the steel plate is not galled, and reliable cutting is performed from this point. Also, the advantage of the present invention is that the straight side part is punched at once with a straight side cutting die, so unlike the conventional punching with punching, a beautiful finish without burr-like protrusions on the cut surface is obtained, and the finishing process is also minimal. The work is done efficiently, and the work is streamlined. This means that a small number of products or a large number of products can be cleaned relatively quickly with low running costs. Also, since the parts on the upper part of the mold have a simple structure, it is easy to manufacture. From the relationship with the holes to be drilled in advance, it can be manufactured by skipping in units of several mm to several tens of mm. Compared with the practical effects, it requires extremely few replacement parts.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a cutting die for punching a polygonal large hole of the present invention.

FIG. 2 is an explanatory view of using a square punch and a straight side cutting die for cutting a steel plate.

FIG. 3 is a perspective view showing a mounting main part of a rectangular punch.

FIG. 4 is a perspective view showing a main part of a linear side cutting die in a mounted state.

FIG. 5 shows a cutting order of a corner hole and a linear slit for a steel plate, (A) is an explanatory view of a corner hole punched by a square punch in four directions of a rectangular large hole area, and (B) is a straight side cutting metal for both corner holes. An explanatory view of fitting a guide shaft portion of a die to make a straight slit, (C) an explanatory view of making the same straight slit on the opposite side, and (D) making a straight slit using a straight side cutting die for a short side portion. FIG.

FIG. 6 is an explanatory view of punching a rectangular large hole by a conventional single punch.

[Explanation of symbols]

 1 Square Punch 2 Straight Side Cutting Die 3 Guide Shaft 4 Shear Angle 5 Cutting Blade 8 Lower Die a Large Hole Area b Corner

Claims (2)

[Scope of utility model registration request] 1. A cutting die for punching a large hole in a steel plate or the like under pressure, and a rectangular punch having a predetermined angle for positioning and corner hole, which is punched in a corner portion of a polygonal large hole area, and a straight line in the large hole area. On the lower surface of both ends of the plate-shaped mold body with the length of the side part, the leg-shaped guide shaft parts that fit into the receiving holes of the lower mold and the corner holes opened at both ends of the straight side part are provided. A cutting die for punching a polygonal large hole in a steel plate or the like constituted by a straight side cutting die having a cutting edge portion with a shear angle formed on the lower surface of the straight portion between the guide shaft portions. 2. A cutting die for punching a polygonal large hole in a steel plate or the like according to claim 1, wherein the cutting blade portion is a shearing angle cutting blade portion having a mountain height at the center.