JPH039941Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cutting device for press products that can cut thick plate press products having a deep U-shaped cross section with high precision.

(Prior art) When attempting to cut a thick pressed product with a deep U-shaped cross section using a normal press machine, the process involves so-called vertical cutting, which may cause mold seizure, chipping, punching burrs, or holes in the product. There is a problem that wrinkles occur early, so it is not practical. Conventionally, therefore, a method has been used in which the pressed product is divided into a straight part and an arc part and cut in two steps, or the product is cut by heat processing.

(Problem to be solved by the invention) In the former of the above, since the cutting is done in two steps, a step of about 1 mm is created at the seam.
Burn-through occurs when cutting surfaces are welded using robots or special machines that require high precision in cutting surfaces. Furthermore, in the latter case, electrodes and nozzles must be replaced at an early stage to ensure accuracy, which increases running costs, and there is a problem in that dross is generated and adheres to products and equipment. The present invention has been made to solve these problems.

(Means for Solving the Problems) The present invention, as a means to solve the above-mentioned problems, uses two concave cutting blades each having a groove formed to match the shape of the product, facing each other and separated by the product cutting width. A pair of roll cutting blades whose blade width is approximately equal to the product cutting width of the two concave cutting blades are rotatably provided at the tip to form a convex blade, and the blade width of the roll cutting blade is It is characterized in that the convex blade is moved up and down in accordance with the product cutting width of the cutting blade and is positioned so that a part of the blade part of the roll cutting blade overlaps with the groove of the concave cutting blade.

(Function) By configuring in this way, first of all, the product:
It is positioned and set so that it spans the grooves of the concave cutting blades provided opposite to each other. When the convex blade is lowered, the product is cut by shearing force between the blade of the roll cutting blade and the edge of the groove of the concave cutting blade, which has a product cutting width S. Since the pair of roll cutting blades are rotatably provided during this cutting, the roll cutting blades are rotated by the shearing force during cutting and the force pushing the convex blade downward. By cutting the product while rotating the roll cutting blade in this manner, there is no rubbing or dragging between the roll cutting blade and the product, and no seizure or peeling occurs. The deep-drawn product is then cut by lowering the convex blade so as to cut through the product stretched between the grooves.

(Example) Next, an example of the present invention will be described with reference to the drawings. First, what is indicated by the reference numeral 1 in FIG. 1 is a roll holder, which has an attachment part 1a that is thicker than other parts and a protruding roll holding part 1b. There are two roll holding parts 1b, each of which holds down the groove 2a of the roll cutting edge 2. 2b is a blade portion. The outer side of the roll cutting blade 2 is rotatably pressed by a roll presser 3 having a recess 3a that partially grips the groove 2a. The roll presser 3 is held down by retainers 4 on both sides and becomes integral with the roll holder 1, forming a convex cutting edge 5 shown in FIG. 2.

FIG. 3 shows the mounting structure of the convex cutting blade 5 assembled in this manner. Reference numerals 6 and 7 in this figure are concave cutting edges (lower cutting edges), which have a shape as shown in FIG. 4. The concave cutting blades 6, 7 are fastened to concave cutting blade holders 8, 9 located outside thereof, respectively, with bolts 10, 11.
The concave cutting blade holders 8 and 9 are fixed to the lower die table 12 with bolts 13 and 14 so that the concave cutting blades 6 and 7 face each other with a constant gap S (product cutting width, see Fig. 4). . The concave cutting blade holders 8 and 9 are backed up by bucking plates 15 to prevent deformation of the concave cutting blades 6 and 7 due to lateral pressure during machining.
The bucking plate 15 is fixed to the lower mold stand 12 with bolts 16.

A guide post holder 17 is fixed to the lower die table 12 with bolts 18. Guide post holder 1
A guide post 19 is press-fitted into 7, and this guide post 19 and a guide post bush 22 fixed to the upper mold table 20 with bolts 21 prevent the convex cutting blade 5 and the concave cutting blades 6 and 7 from sliding. Guarantee accuracy. The mounting portion 1a of the convex cutting blade 5 is held down by a retainer 23, and the retainer 23 is fixed to the upper mold stand 20 with bolts 24. The backing plate 15 has holes 2
5 is provided, and a reference pin 26 is set up inside this hole 25. The reference pins are also provided on the right side of FIG. 3, although not shown, so as to face both ends of the workpiece. In addition, what is indicated by the reference numeral 12a in FIG. 3 is a scrap hole.

What is shown in FIG. 5 is a pressed product which is a workpiece. As shown in the figure, this pressed product 27 has a deep U-shaped cross section, and holes 27a and 27b for passing the reference pin 26 are provided at both ends of the bent portion.

The operation of this embodiment configured in this way will be described next. First, as shown in FIG. 3, the pressed product 27 is placed over the grooves of the concave cutting blades 6, 7, and the reference pins 26 are inserted into the holes 27a, 27b to position the pressed product 27. Set to 7.
Then, the convex cutting blade 5 is lowered together with the upper die table 20. As the convex cutting blade 5 descends, a force F is applied to the rotating shaft of the roll cutting blade 2 to lower the upper mold table 20 as shown in FIG. The roll cutting blade 2 is rotated in the direction of the arrow shown in FIG. 6 due to the relationship between the shearing force and the force F during cutting.

Then, when the convex cutting blade 5 continues to descend, the roll cutting blade 2 rotates, and the shearing force between the concave groove edge on the product cutting width S side of the concave cutting blades 6 and 7 and the blade portion 2b of the roll cutting blade 2 is generated. The pressed product 27 is cut by this.
28 is a cut scrap. Further, by lowering the convex cutting blade 5 and cutting through the pressed product 27 spanned between the concave grooves of the concave cutting blades 6 and 7, the product is cut from the linear wall surface to the curved bottom of the pressed product 27. Ru.

During this cutting process, the roll cutting blade 2 is rotated by the lowering of the convex cutting blade 5, so there is no rubbing or dragging between the roll cutting blade 2 and the pressed product 27, and there is no seizure or burr between the two. No peeling occurs.

(Effects of the invention) As detailed above, according to the invention, two concave cutting blades each having a concave groove are provided facing each other, a pressed product is set so as to span between the concave grooves, and the roll cutting blade The rotatable convex cutting blade descends and cuts through the pressed product, so even deep-drawn pressed products can be cut in one step, and the cut surface will not shift. do not have.

Further, two concave cutting blades are arranged to face each other with a distance of a product cutting width S, and a roll cutting blade having a blade width approximately equal to the product cutting width S is rotatably provided at the tip of the convex cutting blade, and the blade of the roll cutting blade is The width of the convex cutting blade is set to match the product cutting width S, and a part of the blade of the roll cutting blade overlaps the concave groove of the concave cutting blade, so the roll cutting blade is rotated by lowering the convex cutting blade. Can cut pressed products. As a result, there is no rubbing or dragging between the roll cutting edge and the pressed product to be cut, and no seizure, burrs or peeling occur between the two.

As a result, a highly accurate cut surface can be obtained, and welding by a robot or the like can be performed satisfactorily, and since there is no occurrence of seizure, etc., the useful life of the roll cutting blade etc. can be extended, and running costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the convex cutting blade according to the present invention, Figure 2 is an assembled perspective view of the convex cutting blade of Figure 2, and Figure 3 is a perspective view of the convex cutting blade of Figure 2. FIG. 4 is a perspective view of the recessed cutting blade, and FIG. 5 is a perspective view of the workpiece. FIG. 6 is a perspective view showing the cutting state. 2... Roll cutting edge, 5... Convex cutting edge, 6, 7...
Concave cutting blade, 12...lower mold stand.

Claims (1)

[Scope of utility model registration request] A pair of roll cutting blades in which two concave cutting blades each having a groove formed in accordance with the shape of the product are provided facing each other and separated by the product cutting width, and the blade width is approximately equal to the product cutting width of the two concave cutting blades. is rotatably provided at the tip to form a convex blade, and the blade width of the roll cutting blade is adjusted to the product cutting width of the two concave cutting blades, and a part of the blade part of the roll cutting blade is set to match the product cutting width of the two concave cutting blades. A cutting device for pressed products characterized by a convex blade that is positioned so as to overlap the groove and moves up and down.