JPH0450977Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a mold for slitting processing that allows slitting processing using a punch press to be performed reliably and easily without cutting allowances.

(Prior Art) Conventionally, the slitting process of a plate-shaped work such as a metal plate is often performed by shearing with metal scissors or punching with a press machine. Alternatively, for curved slitting, so-called nibbling processing, which is performed using a continuous form of small-diameter punches, is also often performed. There are also specialized shearing machines such as the Bible Shear.

(Problems to be solved by the invention) However, all of these conventional slitting processes have problems. That is,
The items that can be sheared using metal scissors are limited to relatively thin and soft metal plates, and there are many variations in processing accuracy. It also requires more skill, labor, and time.
Further, when punching is performed using a press machine, a long and narrow cutting die is usually used and a long portion is cut by a punching process. Therefore, a gap equal to the thickness of the cutting die is created as a cutting allowance in the cut portion, which often causes inconvenience in post-processing. For example, when bending and welding this cut part,
The welds are separated by the gap, which often makes welding difficult.

Nibbling with a small-diameter punch similarly creates a gap equal to the punch diameter as a cutting allowance, which often causes inconvenience in post-processing. In addition, the machining time is long and the small diameter punch is severely worn out. When using a dedicated shearing machine such as a Bible shear, additional equipment costs and installation space are required.

This invention was devised in view of the above-mentioned conventional problems, and the purpose is to provide a mold for slitting processing that uses a normal punch press machine and does not require a gap or cutting allowance at the cutting part.

[Structure of the invention] (Means for solving the problems) In order to achieve the above object, the present invention is a mold for slitting processing of a punch press machine consisting of an upper mold and a lower mold. An upward cutting blade protruding upward from approximately the center of the pedestal portion of the mold is provided with a vertical surface that coincides approximately with the center of the pedestal portion,
An annular ejector surrounding the upward cutting blade is provided on the pedestal portion so as to be movable up and down and biased upward, and the upper surface of the ejector is normally set higher than the upward cutting blade;
A downward cutting blade protruding downward from the upper mold is provided with a vertical surface substantially coincident with the center of the upper mold, and a gap between the vertical surface of the upper mold and the vertical surface of the lower mold is formed. The upper mold and the lower mold are both rotatable around the center.

(Example) An example of this invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view of upper and lower mold parts, which are the essential parts of an embodiment of this invention, and FIGS. 2 to 6 are explanatory views showing each stage of the slitting process.

In FIG. 1, a slitting mold 1 installed in a punch press machine (not shown) is a lower mold 1.
L and an upper mold 1U, and the lower mold 1L is equipped with an upward cutting blade 3. In addition, in the upper mold 1U,
A downward cutting blade 5 that can freely intersect with the cutting blade 3 is provided. The upward cutting blade 3 is provided in a protruding manner approximately at the center of the circular base portion 7. An annular ejector 11 is disposed around the ejector 11 for raising and returning the plate-like workpiece 9 that is locally lowered during the cutting operation described later.
Several shoulder screws 13 and several ejector springs 15 are disposed on the circumference between the ejector 11 and the pedestal 7. The ejector 11 is now connected to the base portion 7 so as to be able to move up and down a predetermined distance with a predetermined force.

The downward cutting blade 5 projects from the lower end surface 19 of the cylindrical punch 17. Its side (left side in Figure 1)
A plate presser 21 made of urethane rubber is attached to the plate. The punch 17 is fastened with a connecting bolt 25 to the lower end of a punch head 23 disposed above it.
The vertical blade surfaces 27 and 29 of the two cutting blades 3 and 5 are positioned on the vertically aligned center lines of the pedestal 7 and the punch 17, and the directions of these surfaces are also accurately aligned.

For this reason, it is difficult to correctly orient and fix the pedestal part 7 to a pedestal holder (not shown), and to orient the upper punch 17 to a holder guide (not shown) and fit it so that it can move up and down. This is similar to the case of mold attachment. Note that curve cutting can be conveniently performed by numerically controlling the punch press machine and interposing a numerically controlled auto-endexing device (not shown) between the pedestal 7 and the punch 17 to control rotational indexing. That is, both cutting blades 3 and 5 are synchronously rotated horizontally along the intended cutting curve. And plate work 9
By moving the workpiece along the curve to be cut using a workpiece moving device (not shown), the workpiece can be cut automatically.

Each step of slitting the plate-shaped workpiece 9 using a punch press machine (not shown) equipped with the slitting mold 1 configured as described above is performed in the second stage.
This will be explained with reference to FIGS.

First, as shown in FIG. 2, both the cutting blades 3 and 5 are opened vertically, the workpiece 9 is placed on the ejector 11, and the planned cutting line is precisely aligned with the cutting edge line of the upward cutting blade 3. At this time, it goes without saying that if the punch press machine (not shown) is numerically controlled and equipped with an auto index, accurate positioning and orientation will be performed automatically. Next, as shown in FIG. 3, when the downward cutting blade 5 is lowered, the ejector 11 sinks and shearing begins. In FIG. 4, the ejector 11 has descended the most and the shearing has temporarily ended. Next, the fifth
As shown in the figure, when the downward cutting blade 5 is raised, the ejector 11 and the workpiece 9 are also raised together.

Subsequently, when the downward cutting blade 5 is raised to the maximum as shown in FIG. 6, the workpiece 9 also returns to the level shown in FIG. 2 and rises. Here, the workpiece 9 is fed along the planned cutting line by a length equivalent to one cutting by both cutting blades 3 and 5. Thereafter, the above steps are repeated to perform slitting processing on the workpiece 9 to a predetermined length. Note that even if the numerically controlled auto-endexing device is not installed, it is of course possible to cut a curved line by feeding the workpiece 9 while horizontally rotating it along the line to be cut.

Since the slitting process is performed by repeated shearing as described above, the kerf of the cut portion is zero, and no gap is generated due to the kerf as in the conventional method. In addition, processing is easy and quick, and there is little wear and tear on the mold. Furthermore, there is no need for a separate dedicated shearing machine like the conventional Bible shear, and the slitting process can be easily performed using only a punch press machine. It is more convenient if the press is a turret punch press and the slitting molds are attached to the upper and lower turrets of the press.

The slitting mold of the punch press machine of this invention is not limited to the one embodiment described above, but can be modified in various ways. For example, the upper and lower cutting blades may not be straight blades, but may be wavy surface blades with wavy uneven cutting lines. Further, by arranging a plurality of combinations of upper and lower cutting blades at predetermined intervals, it is possible to easily perform slitting processing on a plurality of pieces at the same time. Furthermore, the cutting characteristics can be changed by changing the blade lengths of the upper and lower cutting blades. For example, if there are many straight cuts, it can be made longer to improve the machining speed, and if there are many curved cuts with small curvature, it can be made shorter to make it easier to handle.

[Effects of the invention] As can be understood from the explanation of the embodiments above, the present invention has an upper mold 1U and a lower mold 1L.
This is a mold for slitting processing of a punch press machine, and the upward cutting blade 3 protruding upward from approximately the center of the pedestal part 7 of the lower mold 1L is aligned approximately with the center of the pedestal part 7. An annular ejector 11 having a vertical surface 27 and surrounding the upward cutting blade 3 is provided on the pedestal portion 7 so as to be movable up and down and biased upward, and in a normal state, the ejector 11 The upper mold 1 is attached to the lower cutting blade 5, which has an upper surface higher than the upper cutting blade 3 and protrudes downward from the upper mold 1U.
A vertical surface 29 that coincides with approximately the center of U is provided, and a gap between the vertical surface 29 of the upper mold 1U and the vertical surface 27 of the lower mold 1L is made small, and the upper mold 1U and the lower mold 1L are Both are rotatable around the center.

As is clear from the above configuration, in the present invention, the vertical surface 2 formed on the upward cutting blade 3 protruding upward from approximately the center of the pedestal portion 7 of the lower mold 1L.
7 is a vertical surface 39 which is substantially aligned with the center of the pedestal portion 7 and is provided with a downward cutting blade 5 which is provided to protrude downward from the upper mold 1U that cooperates with the lower mold 1L.
is almost coincident with the center of the upper mold 1U. Then, the vertical surfaces 29, 2 of the upper and lower molds 1U, 1L
7 has a small clearance (sometimes zero clearance), and the upper and lower molds 1U, 1
Both L are provided so as to be rotatable around the center.

Therefore, according to the present invention, the workpiece 9 is sheared by cooperation between the upward cutting blade 3 of the lower mold 1L and the downward cutting blade 5 of the upper mold 1U, and the workpiece 9 is fed little by little. By repeating shearing, the slitting process can be performed on the workpiece 9 without producing scraps (punched pieces during shearing).

In this case, even if the upper and lower molds 1U and 1L are rotated in the same direction at the same time, the vertical surface 29 of the downward cutting blade 5 provided in the upper mold 1U and the upward cutting blade provided in the lower mold 1L Since the vertical planes 27 of 3 are almost aligned with the center, both vertical planes 29, 27
The positional relationship of can always be kept almost constant,
The workpiece 9 can be easily cut in a curved line.

Furthermore, according to the present invention, the ejector 11 provided in the lower mold 1L is biased upward, and the upper surface of the ejector 11 is normally set higher than the upward cutting blade 3. During relative movement in the horizontal direction, the lower surface of the workpiece 9 will not come into contact with the upward cutting blade 3, and no scratches will occur.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a main part of an embodiment of this invention, and FIGS. 2 to 6 are explanatory diagrams of each stage of slitting processing using the apparatus shown in FIG. 1. 1...Mold for slitting processing, 3...Upward cutting blade, 5...Downward cutting blade, 9...Plate-shaped workpiece.

Claims (1)

[Scope of utility model registration request] In a slitting mold for a punch press machine consisting of an upper mold 1U and a lower mold 1L, the above-mentioned An annular ejector 11 having a vertical surface 27 substantially aligned with the center of the pedestal 7 and surrounding the upward cutting blade 3 is provided on the pedestal 7 so as to be movable up and down and biased upward. and the upper surface of the ejector 11 is set higher than the upward cutting blade 3 in a normal state,
The downward cutting blade 5 protruding downward from the upper mold 1U is provided with a vertical surface 29 that coincides approximately with the center of the upper mold 1U, and the vertical surface 29 of the upper mold 1U is
9 and the vertical surface 27 of the lower mold 1L, and the upper mold 1U and the lower mold 1L are both rotatable around the center. Mold for processing.