JPH034410Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a press mold, and particularly has a cross-sectional shape that is substantially the same in the longitudinal direction. This invention relates to a press mold suitable for pressing products that require peripheral precision.

(Prior technology) Pressed products that require dimensional accuracy on the outer edge and whose height is approximately half the width of the product require a process of slicing the coil material into small pieces, forming the product shape by drawing or bending, and then removing the outer periphery. It is obtained through the outline cutting process.

Conventionally, three steps were required to obtain a pressed product that required circumferential precision because it was necessary to cut the product into small pieces prior to the molding step.
That is, since the drawing or bending die used in the forming process does not have cutting edges, the material supplied to this process must be cut into small pieces.
It is difficult to guide the material cut into small pieces to an accurate position during the molding process, and if a slight positional deviation occurs, the desired circumferential precision cannot be obtained. Therefore, the deviation during molding is corrected in the outline cutting process.

(Problems that the invention aims to solve) As the product is obtained through three processes as mentioned above, and separate molds are required for the molding process and the outline cutting process, the number of processes is large and the mold Production costs are high. Moreover, workers are required for each process.

An object of the present invention is to provide a press mold that can shorten the number of steps, reduce mold manufacturing costs, and reduce the number of workers, and can also produce a product that requires dimensional accuracy on the outer periphery.

(Means for Solving the Problems) The present invention is a press mold consisting of an upper mold and a lower mold, the upper mold having a molding pad and a cutting blade disposed on one side with respect to the molding pad. and a bending die disposed on the other side with respect to the forming pad, the lower die having a die disposed opposite to the forming pad, and the bending die on the one side. a cutting die having a cutting blade for cutting the material in cooperation with the cutting blade of the upper die, and a pin for lifting the product, and when the upper die is lowered, the material is first clamped by the cooperation of the forming pad and the die. It is characterized by being

(Function) When the material with the coil unwound is supplied, the upper die is lowered and the material is clamped together with the forming pad and die. When the upper mold further descends, the material is cut by the cutting blade of the upper mold bending mold and the cutting blade of the lower cutting mold. At this time, since the material is held between the molding pad and the die, the cut portion of the material is held immovably, and the accuracy of the outer circumferential dimension is ensured.

As the upper die further descends, the material is bent and formed by the bending die of the upper die and the die of the lower die. After molding the product, when the upper die is raised, the product is lifted by the pins.

(Effect) The bending die itself of the upper die has a cutting edge,
Because the material is first clamped together with the molding pad and die, it is possible to obtain a product that requires precision in the outer circumferential dimension in one process, reducing the number of processes by two compared to the conventional method. The number of workers can be reduced by two.

Since conventional outline cutting is not required, the number of molds for this purpose can be reduced, and mold manufacturing costs can be reduced.

Since the cut surface of the material portion jointly held by the molding pad and the die becomes the outer periphery of the product, no scrap occurs on this side of the product, which occurs when outline cutting is performed. This makes it possible to achieve economical use of materials and reduce material costs.

(Example) The press mold 10 consists of an upper mold 12 and a lower mold 14.

The upper mold 12 has a molding pad 16 and a molding pad 16
A bending die 18 is provided on one side of the bending die 18. In the illustrated example, the upper die 12 is provided with a bending die 20 disposed on the other side with respect to the forming pad 16, and material holding pads 22, 24.

The molding pad 16 consists of a molding punch 26 and a pad 28 made of urethane rubber that applies biasing force to the molding punch 26. The forming punch 26 is pushed downward by the pad 28 and is movable up and down within the range of deformation of the pad 28.

The bending die 18 is arranged on one side with respect to the forming pad 16, in the illustrated example, on the supply side of the material 30,
A cutting edge 32 is provided on the side facing away from the molding pad 16. Further, the side surface facing the molding pad 16 is formed as a processed surface 33 to be applied to the product. The cutting blade 32 cooperates with the cutting blade of a lower cutting die to be described later to cut the material 30 unwound from the coil and supplied. The cut surface of the material portion separated here becomes the outer peripheral surface required on one side of the product.

The bending die 20 is located on the other side of the forming pad 16. This bending die 20 has a cutting edge 34 on the side facing away from the forming pad 16, and the side facing the forming pad 16 is formed as a processed surface 35 to be applied to the product.

As in this example, a bending die 20 having a cutting edge 34
By placing the
It is most preferable because one side can be secured by the cutting edge 32 of the bending die 18 and the other side by the cutting edge 34 of the bending die 20, and after that, there is no need for any outline cutting process. However, depending on the product, the outer peripheral surface on the other side may be secured by cutting the cut surface by the cutting blade 32 as it is without cutting the outer shape, or by cutting the outer peripheral surface separately. In this case, the cutting edge 34 of the bending die 20 becomes unnecessary.

The material holding pad 22 is made of urethane rubber, and is placed on the material inlet side with respect to the bending die 18. Further, the material holding pad 24 is biased downward by the coil spring 36, and the material holding pad 24 is biased downwardly by the coil spring 36.
It is located on the exit side. As will be described later, the material 30 supplied to the press die 10 is first
Since the molding pad 16 and the die sandwich and hold the molded material immovably, these material pressing pads 22 and 24 are not necessary in order to directly ensure the accuracy of the outer circumferential dimension of the product. However, in order to further enhance the effect of holding the material immovable during cutting, it is preferable to provide these material holding pads 22 and 24.

The lower die 14 includes a die 40 disposed opposite to the molding pad 16, a cutting die 42, and a pin 44 for lifting the product.
6.

Die 40 has a profile 41 to be applied to the product and cooperates with forming pad 16, bending die 18 and bending die 20 to process the product.

The forming pad 16 and the die 40 are formed so that when the upper die 12 is lowered, the forming pad 16 and the die 40 initially hold the material 30 between them. That is, the bending die 18 and the bending die 20
Before contacting the blank 30, the forming pad 16 presses the blank 30 toward the die 40 so that the blank 30 is held stationary.

As in the illustrated example, the material holding pads 22, 24
are provided, the mutual relationship is determined so that the material pressing pads 22, 24 press the material 30 against the lower die 14 prior to or substantially simultaneously with the material being clamped by the forming pad 16 and the die 40.

The cutting die 42 has a cutting edge 48 for cutting the material 30 in cooperation with the cutting edge 32 of the bending die 18, while the cutting die 46 cooperates with the cutting edge 34 of the bending die 20 to cut the product. It has a cutting blade 50 that cuts off the edge.

In the illustrated example, the pin 44 includes a receiving member 52 facing the bending die 18 and a receiving member 54 facing the bending die 20, each receiving member having a coil spring 56.
It rests on the ducting pad 58 via the ducting pad 58, which is biased upwardly by a mechanical or pneumatic structure known per se. That is, the pin 44 has the function of a cushion during molding and the function of lifting the product after molding.

(Operation of the embodiment) As shown in FIG. 2, when the material 30 with the coil rewound is supplied (a), the upper die 12 is lowered and the forming pad 16, die 40, material holding pad 22 and the material are cut. The material is held together by the die 42, the material holding pad 24, and the cutting die 46. When the upper die 12 further descends, the material portion 31a is cut by the cutting edge 32 of the bending die 18 and the cutting edge 48 of the cutting die 42, and the cutting edge 34 of the bending die 20 and the cutting edge 50 of the cutting die 46 are cut. As a result, the edge 31b is cut (b).

As the upper mold 12 further descends, the receiving members 52 and 54 are pushed down, and the material portion 31a bends between the bending molds 18 and 20 of the upper mold 12 and the die 40 of the lower mold 14.
The product 60 is formed by bending and forming.

After molding, when the upper mold 12 is raised, the product 60 is placed on the receiving members 52 and 54 of the pin 44 and lifted (c).

[Brief explanation of drawings]

FIG. 1 is a front view of the press die, and FIGS. 2 a to 2 c are explanatory diagrams showing the outline of the operation. 10: Press mold, 12: Upper mold, 14: Lower mold, 1
6: Molding pad, 18, 20: Bending mold, 22, 2
4: Material press pad, 32, 34, 48, 50:
Cutting blade, 40: die, 42, 46: cutting die, 44: pin.

Claims (1)

[Scope of utility model registration request] A press mold consisting of an upper mold and a lower mold, the upper mold having a molding pad, a bending mold having a cutting edge disposed on one side with respect to the molding pad, and a bending mold with a cutting edge disposed on one side with respect to the molding pad. a bending die disposed on the other side, and the lower die cooperates with a die disposed opposite the forming pad and the cutting blade of the bending die on the one side to cut the material. A cutting die having a cutting edge for lifting the product and a pin for lifting the product,
A press mold in which when the upper mold descends, the material is first clamped by the cooperation of the molding pad and the die.