JPH04108916U - Drawing mold - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to provide a drawing die that can shorten the drawing process and produce products of good quality. [Structure] An upper mold pad 3 is provided on the upper mold main body 1, and a processing cam 4 that moves in the direction of the upper mold pad 3 when the upper mold main body 1 is lowered is provided, and the plate material is held between the upper mold pad 3 and the bed 5. A lower die punch 6 is provided, and a lower die wrinkle presser 7 is provided which presses the edge of the plate material P with the processing cam 4, and the vertical wall surface 61 of the lower die punch 6 and the vertical wall surface 44 of the processing cam 4 are set at a negative angle in the pressing direction. The plate material P is drawn with its both ends pressed down, and the vertical wall surfaces 61 and 44 form a negative angle. [Effects] Drawing and negative angle forming can be performed in one continuous process, reducing the ironing range and improving product quality.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a drawing die for drawing a flat plate material into a panel with side walls. It is.

0002

[Conventional technology]

The basic structure of a conventional drawing die is a die, a punch, and a wrinkle presser, as shown in Figure 8. In the conventional structure shown in , a punch 6 is provided on the bed 5 and a cylinder device 9 is The presser foot 7 is supported so that the die 2 is lowered from above the punch 6. . Then, the wrinkle presser 7 raises both ends of the plate material P, which is originally a flat plate, to the top dead center position. The plate material P is supported by the punch 6 by sandwiching it between the die 2 and lowering the die 2. In this state, both sides are squeezed by the die R part 21 and finally formed into a U-shaped cross section. Ru.

0003 By the way, a product that is U-shaped bent in this way inevitably has a shape as shown in Figure 9. Springback S and wall warping C occur.

0004 For this reason, conventionally, as shown in FIG. 10, a mold member 50 in which the vertical wall surface 51 is formed at a negative angle Set the plate material P formed in the above manner while being held down by pad 3, and press it from both sides in the same manner. The spring bar is pressed by the machining cams 4a and 4b having vertical wall surfaces 44 with negative angles. We perform secondary processing to correct cracks and wall warpage, and manufacture products with the desired cross-sectional shape. was.

[0005]

[Problem that the idea aims to solve]

Therefore, the present invention eliminates the need for secondary processing and allows the plate material to be springbacked and processed in one process. To provide a drawing die capable of drawing into a desired cross-sectional shape with corrected wall warpage. This was done as a challenge.

[0006]

[Means to solve the problem]

The drawing die of the present invention is shown in FIGS. 1 to 7 showing the die structure and forming process. The upper mold assembly A is attached to the ram (not shown) and the lower mold assembly is placed on the bed 5. The upper mold assembly A includes an upper mold pad 3 attached to the lower surface of the upper mold body 1. , a processing cam 4 is provided on the lower surface of the upper die main body 1 so as to be movable in the left and right direction, The lower mold assembly B is arranged oppositely to the upper mold pad 3, and is connected to the upper mold pad 3 to form a plate. A lower die punch 6 that clamps the material P and a lower die punch 6 disposed opposite to each other below the processing cam 4 a lower die wrinkle presser 7 that presses the edge of the plate material P with its lower surface; and an inclined surface 42 of the processing cam 4; A fixed cam 8 that comes into contact with the cam and guides the movement of the processing cam 4 in the direction of the lower die punch 6. The vertical wall surfaces of the lower die punch 6 and the processing cam 4 facing each other face each other in the pressing direction. It is characterized by being formed at a negative angle.

[0007]

【Example】

Figures 1 to 7 show the structure of the drawing die of the present invention and the process of processing plate materials using the drawing die. show.

[0008] A spring 3 is attached to the lower surface of the upper mold body 1 which is attached to a ram (not shown) and moves up and down. An upper mold pad 3 is provided with the upper mold pad 1 interposed therebetween. The upper mold assembly A has the upper mold pad 3 inside. The structure is centrally symmetrical, and the figure shows only one side. A machining cam 4 is suspended from the lower surface of the machine 1 so as to be movable left and right. Upper part of processing cam 4 A processed member 41 is fitted onto the vertical wall on the side of the pad 3. Also, contrary to the above for processing cam 4, The opposite wall surface is an inclined surface 42, and a sliding member 43 is fitted onto the surface 42. Ru.

[0009] On the other hand, a lower mold punch 6 is provided on the bed 5 at a position directly below the upper mold pad 3. . The lower die assembly B has a symmetrical structure centering on the lower die punch 6, and the figure shows it. Only one side is shown, and the bed 5 has a lower pan facing the processing cam 4. A lower die wrinkle presser 7 is assembled adjacent to the die 6. The lower die wrinkle presser 7 is equipped with a cylinder. The wrinkle presser is held at the top dead center position of the device 9 as shown in Fig. 1. The upper surface of the punch 7 and the upper surface of the lower die punch 6 are made to be on the same level.

0010 A fixed cam 8 is further supported on the bed 5. The fixed cam 8 is It has an inclined guide surface 81 corresponding to the inclined surface 42 of the processing cam 4, and the processing cam 4 is lowered. A sliding member 43 provided on the inclined surface 42 comes into contact with the inclined surface 42 when the inclined surface 42 is opened.

[0011] The vertical wall surface 61 of the lower die punch 6 and the vertical wall surface of the processing member 41 integrated with the processing cam 4 The wall surface 44 is directed downward at a negative angle with respect to the pressing direction, that is, the downward direction of the processing cam 4. The workpiece 41 A rounded portion 46 is formed at the corner transitioning from the vertical wall surface 44 to the bottom surface 45.

0012 Next, the operation of the drawing die configured as described above will be explained. First, as shown in Figure 1. The center of the plate material P, which is flat and will eventually be processed into a U-shape in cross section, is The part is placed on the lower mold punch 6, and the left and right sides are placed on the lower mold wrinkle presser 7.

[0013] When the upper die pad 3 and the processing cam 4 are lowered together with the upper die body 1, as shown in Fig. 2. As shown, the upper die pad 3 presses the plate material P onto the lower die punch 6, and the lower surface of the processing cam 4 The plate material P on the lower die wrinkle presser 7 is gripped.

[0014] When the processing cam 4 further descends while pushing the lower die wrinkle presser 7, the plate material P is pressed against the lower die part. It is bent at the part corresponding to the corner of the punch 6, and the side wall P1 of the plate material P is bent as shown in FIG. When the extension line of the desired part becomes perpendicular to the guide surface 81 of the fixed cam 8, the processing cam No. 4 sliding member 43 contacts the guide surface 81.

[0015] When the processing cam 4 further descends, the processing cam 4 is lowered and fixed as shown in Fig. 4. Guided by the cam 8, it moves to the left in the direction of the lower die punch 6 and presses the R portion 46 of the workpiece 41. comes into contact with the intermediate portion of the side wall P1 of the plate material P.

[0016] When the machining cam 4 further descends and moves to the left, the plate material as shown in FIG. As the bending of P progresses, the R portion 46 of the processed member 41 bends the side wall P1 of the plate material P. Very much.

[0017] As the machining cam 4 further descends and moves to the left, the end of the plate P as shown in FIG. The edge slides out from the processing cam 4 and the lower die wrinkle presser 7, and the vertical wall surface 4 of the processing member 41 4 approaches the vertical wall surface 61 of the lower die punch 6.

[0018] Finally, as shown in FIG. 5 and the shoulder part 62 of the lower die punch 6, and the side wall P1 of the plate material P is processed. The vertical wall surface 44 of the member 41 is pressed against the vertical wall surface 61 of the lower punch 6 .

[0019]

[Effect of the idea]

However, when processing the plate material P with the drawing die of the present invention, one continuous processing step is required. Negative angle forming is performed inside the product to correct springback and wall warpage, and the bottom It bends from the wall to the side wall P1 at a predetermined angle (right angle in the example), and there is no warp on the side wall P1. A product with a U-shaped cross section is obtained. In addition, the ironing applied to the side wall of the product is The product quality is improved compared to the conventional method where the entire side wall is squeezed. In both cases, since the ironing area is small, there is little wall warpage, and negative angle forming is easy. In this way, this invention shortens the drawing process and improves product quality. do.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the drawing die of the present invention before it starts operating.

FIG. 2 is a cross-sectional view at the time when the drawing die starts operating and the processing cam grips the plate material.

FIG. 3 is a cross-sectional view at the time when the bending process of the plate material is started by the drawing die.

FIG. 4 is a cross-sectional view at the time when the plate material is strained by the drawing die.

FIG. 5 is a cross-sectional view at a time when processing has further progressed using the drawing die.

FIG. 6 is a cross-sectional view of the drawing die immediately before completion of processing.

FIG. 7 is a cross-sectional view when processing is completed using the drawing die.

FIG. 8 is a sectional view of a conventional drawing die.

FIG. 9 is a diagram showing springback and wall warpage of a product processed with a conventional drawing die.

FIG. 10 is a sectional view of a conventional negative angle mold.

[Explanation of symbols]

A Upper die assembly B Lower die assembly P plate material 1 Upper mold body 3 Upper mold pad 4 Processing cam 41 Processed parts 42 Inclined surface of processing cam 44 Vertical wall surface of processed part 46 R section 5 bed 6 Lower die punch 61 Vertical wall surface of lower punch 7 Lower die wrinkle presser 8 Fixed cam 9 Cylinder device

Claims (1)

[Scope of utility model registration request] Claim 1: Consisting of an upper die assembly attached to a ram and a lower die assembly placed on a bed, the upper die assembly includes an upper die pad attached to the lower surface of the upper die body, and an upper die assembly attached to the lower surface of the upper die body. The lower die assembly is provided with a processing cam suspended from the lower surface thereof and movable in the direction of the upper die pad, and the lower die assembly is disposed directly below the upper die pad to face it, and the plate material is held between the upper die pad and the lower die assembly. A lower die punch, a lower die wrinkle presser which is disposed correspondingly below the processing cam and presses the edge of the plate material with the lower surface of the processing cam, and a lower die wrinkle presser which is in contact with the inclined surface of the processing cam and presses the edge of the plate material with the lower surface of the processing cam. A drawing die including a fixed cam that guides movement, and in which vertical wall surfaces of the lower die punch and processing cam that face each other are formed at a negative angle with respect to the pressing direction.