JPS6027438A - Oscillatory forging method of long-sized belt-like material - Google Patents

Abstract

PURPOSE:To forge a blank material to have the transverse sectional shape varying in the longitudinal direction thereby supplying the blank material into the space between an upper die provided to a holder which oscillates and moves linearly and a lower die which is fixed to a base moving linearly in the direction where the space between the dies is increased or decreased. CONSTITUTION:A long-sized square belt material or round bar 1' is supplied between an upper die 6 which oscillates and moves linearly and a lower die 5 which moves linearly in the direction where the space between said upper die and the lower die is increased or decreased. The die 6 inclines in accordance with the movement of an oscillating shaft 8 and at the same time the die 5 moves upward so as to form a prescribed sectional shape, thereby decreasing the space between the die 6 and the die 5. The die 5 descends cooperatively with the die 6 to form one section in the transverse direction when the shaft 8 moves toward the side opposite from a pressurizing shaft 7. The entire part of the material 1' is formed while said material is successively moved longitudinally.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for oscillating forging of a long belt-like product having different cross-sectional shapes in the width direction in the longitudinal direction.

[Background of the invention]

1.1 shows an example of a long strip-shaped product 1 having different cross-sectional shapes in the width direction in the longitudinal direction. ,! Figure 2 shows the shape of each cross section of the spear, not shown in Figure 1. Each cross-sectional shape is similar. Conventionally, such a long strip-shaped article 1 has been formed by the following method.

First, a method of forming by cutting a long strip-shaped square material having a cross section in the width direction including the B-B cross section. In this case, the material yield was poor and the number of man-hours was too high.

Alternatively, the shape of the B-B cross section is force-worked by hot drawing or hot extrusion, and then finished by cutting.

Even with this method, the number of man-hours required for cutting is still large, and furthermore, due to damage caused by hot drawing and abrasion of the extrusion mold, the ratio of mold cost to the cost becomes high, and thus does not result in cost reduction.

On the other hand, in the case of hot precision forging using a full die, large-sized equipment is required, and a mold corresponding to each product shape is required, which is difficult to realize in terms of equipment costs and mold costs.

[Object of the Invention] An object of the present invention is to provide a method for forming the entire long strip-shaped product having different cross-sectional shapes in the width direction in the longitudinal direction while partially applying pressure with a pair of standard tools without using a linear mold. There is a particular thing.

[Summary of the invention]

A long strip of square material or a round bar is placed between the upper mold installed on a holder that swings linearly and the lower mold fixed on a base that moves linearly in the direction of increasing or decreasing the gap between the upper mold and the upper mold. (hereinafter referred to as the raw material), one section in the width direction of the material is formed by the linear swinging movement of the upper die and the linear movement of the lower die in the direction of the upper die, and the material is sequentially shaped in the longitudinal direction. Shape the whole thing while feeding it.

[Embodiments of the invention]

Figure 3 is a schematic diagram of an embodiment of the present invention. Fang 4
The figure is its front view. The object to be molded has the shape shown in Fig. 1. The thickness of the material 4 is the same as that of the thick portion 1' in the B-B cross section. The area of each surface in the width direction is preformed so that it is 10% larger than the area of the corresponding cross section of the long strip 1 to be formed.

The structure of the mold consists of an upper mold 6 left on a boulder (not shown) that performs a linear rocking motion (described later), and a linear swing in the direction of tightening or reducing the gap between the upper mold 6 and the upper mold 6. It consists of a lower mold 5 fixed to a movable base (not shown). The pressing surface 6' of the upper mold 6 has the same curvature as the two concave shapes of the C-C cross section, and its length in the width direction is longer than the length in the width direction of the B-B cross section. The thickness in the longitudinal direction is approximately 17'IQ of the total length of the long strip 1.
shall be. The shape of the lower mold 5 has the same curvature as the convex side 6 of the B-B cross section, and the length in the width direction is longer than the width direction length of the B-B cross section. The thickness in the longitudinal direction is approximately twice that of the upper mold 6.

Next, the linear rocking motion of the upper mold will be briefly explained using Figure 5.

The pressing axis 7 is a vertical line from the base of the lower mold 5 passing through the center 6'' of the upper mold pressing surface 6'.The center of the upper mold pressing surface 6' is called the upper mold pressing surface fixed point 6''.

Also, the center of curvature of the upper mold pressurizing surface 6' is set to the upper mold curvature center 7'.
It is called. The law of the curved surface of the upper mold pressing surface 6' passing through the fixed point 6'' of the upper mold pressing surface is called the upper mold swing axis B. This axis is fixed to the upper mold 6, and the movement of the axis and the upper mold 6 are The motion is the same.The locus is called the swing locus 9, which is a locus drawn around the fixed point 6'' of the upper mold pressing surface and the fixed point 6# of the upper mold pressing surface with the distance from the center of curvature 7' of the upper mold as a radius. , the intersection between this and the upper die swing axis 8 is called an upper die swing point 8'. The linear rocking motion of the upper mold means that the upper mold swing point 8' is moved along the rocking trajectory 9 with the pressurizing shaft 7 as the center.
This is the movement of the upper die 6 when it moves from side to side on the paper along the line. In other words, the fixed point 6'' of the upper die pressurizing surface does not move like the center of the press.

The state of molding using the upper mold 6 and lower mold 5 configured as described above will be shown next.

First, the material 1 and the mold are in a positional relationship as shown in Figure 4 before the start of molding.

Figure 6 shows the positional relationship between a cross section of the material being molded and the mold. As the upper mold swing shaft 8 moves, the upper mold 6 tilts (θ-20° in the figure). At the same time, the lower mold 5 rises to create a predetermined cross-sectional shape, and the upper mold 6 and the lower mold 5 Reduce the gap.

Next, when the upper mold swing shaft 8 moves in the opposite direction to the pressure shaft 7 from the state shown in Figure 6, the upper mold pressure surface fixed point 6'' when both shafts overlap
The lower mold 5 is moved in conjunction with the upper mold 6 from the state shown in Fig. 6 so that the gap between the center point 100 of the pressurizing surface of the lower mold and the center point of the pressurizing surface of the lower mold is the same as the thickness of the thick part 1' of the cross section B-B in Fig. 2. descend. Further, the state after passing through the pressurizing shaft 7 is the same as that shown in Fig. 6 . In this way, one section in the width direction is formed, and then the entire material is formed while sequentially moving the material in the longitudinal direction.

Above, we have explained the case in which one cross-section is formed by one rocking motion of the upper die 6, but if there is a large difference in wall thickness within the cross-section, it is difficult to mold by one rocking motion. be. In such a case, each cross section may be formed in two or more steps. For example, when carrying out the process in two steps, the entire longitudinal direction is rough-formed once, and the finish-forming is performed in the second step.

In addition, forming the convex portions of each cross section and the curved surfaces of the four parts is performed by 1 of the upper die 6.
It can be controlled by the wall thickness reduction rate per rotation, that is, the degree of rise of the lower die. - If the wall thickness reduction rate per swing is large, the plastic deformation area of the pressurizing surface 5' of the lower die 5 will increase and the curvature diameter will become small; in the opposite case, - Wall thickness per swing When the rate of decrease is small, the radius of curvature becomes large.

Therefore, in forming a cross-section, whether it is rough forming or finishing forming, it is necessary to control the wall thickness reduction rate per swing, that is, the upward and downward movement of the lower mold. be.

Although the surface quality of the molded product is inferior to that obtained by cutting or precision forging, it can be finished in a short time by belt grinding.

〔Effect of the invention〕

According to the present invention, since partial pressure is applied, it is possible to perform plastic working on a long belt-shaped product having different cross-sectional shapes in the width direction in the longitudinal direction without using large equipment such as precision forging using a mold. . Therefore, compared to double cutting, material yield can be significantly improved.

Furthermore, since no set mold is used for the mold, the mold cost can be significantly reduced.

[Brief explanation of the drawing]

Fang 1 figure is a perspective view of an example of a long belt-like product with different cross sections in the width direction in the longitudinal direction, λ・2 figure is each cross-sectional view designated by Fang 1 figure,
Figure 3 is a schematic diagram of one embodiment of the present invention, Figure 4 is a front view thereof, Figure 5 is an explanatory diagram of the swinging movement of the upper mold, and Figure 6 is a diagram of the upper die.
The figure is an explanatory diagram that does not show the state during molding. 1... Long strip product, 1'... B-B cross-sectional thickness inside 2
...Concave side, 3...Convex side, 4...Material, 5...Lower die, 5'-Lower die pressure surface, 6...Upper die, 6'...Upper die pressure surface , 6''...Fixed point on the pressurizing surface of the upper die 7...Pressure axis, 7'...Center of curvature of the upper die, 8...Swivel axis of the upper die, 8' Swing point of the upper die, 9...・Swinging trajectory,
10. Lower mold force

Claims (1)

[Claims] A long strip-shaped square material or a round bar is supplied between the upper mold that moves in a linear oscillating motion and the lower mold that moves linearly in the direction of increasing or decreasing the gap between the upper mold and the upper mold. A long machine characterized by forming a cross section of the material in the width direction and molding the entire material while sequentially feeding the material in the longitudinal direction by controlling the oscillating motion i in conjunction with the linear motion of the lower die. Oscillating forging method for moon band products.