JPS61193738A - Forming metal die of bar having deformed section - Google Patents

Abstract

PURPOSE:To reduce work hardening during rolling and to prevent meandering of a bar having a deformed section by deepening a side groove formed by a thick rib gradually toward the rear of a metal die and forming the bar having the deformed section into a specified thin thickness by the laser half of the metal die for lateral direction roller rolling of the bar having thin side parts and the deformed section. CONSTITUTION:The material W intermittently supplied between the metal die 3 having ribs 33 forming an intermediate groove gradually and a rolling roller 2 moving in the lateral direction of the material W is rolled in the lateral direction to be formed into a bar A having a specified stepped deformed section. The ribs 33 of the die 3 are shaped so that the ribs 33 vary from a slope 34 forming a step groove 32 of the deformed bar to a flat rib 35 expansively, good quality products are manufactured by repeated rolling of the material W to minimize parts subjected to work hardening, to reduce rolling energy, and to prevent meandering of the deformed section bar A caused by work hardening.

Description

[Detailed description of the invention] [Unusable/objective in terms of value] This invention relates to a mold for forming strips with irregular cross-sections. Regarding irregularly shaped strips, at least one side has a thin section and one
The part adjacent to the thin part of the dent is inside one structure. Examples of such a strip include a strip A with a modified cross section in which both sides are thin-walled portions a and the center portion of C1 is a thin-walled portion n, as shown in Figure 3, or one side as shown in Figure 8gμ. There is a thin section C, and the other 114II section is a thick section d and a section B with a sag-shaped cross section.

Conventionally, when forming the above-mentioned irregular cross-sectional strips, for example, the irregular cross-sectional strip A shown in FIG. 3, as shown in FIG. 2. The mold 1 is formed with protrusions 12, 12 extending along the longitudinal direction of the material W on each side of the upper surface of a flat mold body 11. The tip end portion L2a is formed so that its thickness becomes progressively smoother as it goes from the tip side to the rear end side.On the other hand, the rolling roll 2 has a cylindrical shape, and its axis line is It is arranged so that it can be rotated and rotated freely in the longitudinal direction of the material W.The material W is then moved in the width direction of the material W (in the direction of arrows A and B of @tar), and the material W is called the mold l. 1.The material W is formed by rolling the material W in places from the front end of the mold 1 to the rear end after the rolling roll 2 rolls the material W and before rolling starts again. Quantitative (
Usually, it is approximately l/ψ of the length l of the tip portion 12H. ) send.

[Problem that the invention seeks to solve]

When the entire strip with a rectangular cross section is formed using the mold 1 as described above, each 911I section of the strip with an irregular cross section is /JR
, the founder of becoming the next (hereinafter referred to as fJL kidnapping phenomenon)
In other words, as shown in FIGS. 6 and 7, the degree of rolling of the material W increases as it is fed, so its width gradually widens, resulting in 2 materials in the middle W
The side edges of the material W are inclined with respect to the longitudinal direction of the material W. On the other hand, the side edges of the molded product WC are parallel to the longitudinal direction of the raw material W. In other words, the material W during processing
The lengths of the four edges are longer than the lengths of the side edges of the molded product WG. For this reason, the material W is the completed molded product WG.
During the IM process, the side edges receive compressive force.

In this case, if the side edges of the material W are soft, the material W will be plastically deformed and shrunk due to the compressive force, so that the IrI phenomenon will not occur.

However, in the above-mentioned mold l, since both measuring parts of the material W, which are to be thin-walled parts, are simultaneously molded, the tllll edge of the material W is formed when the material W is a completed molded product WG. It has been rolled before the final stage, which results in work hardening. With this in mind, both edges of the material W were kept in a long shape without shrinking, and this appeared as a rippled bundle.

[Purpose of the invention]

This invention was made to solve the above-mentioned problem, and provides a mold for forming a strip with an irregular cross section, which can prevent the phenomenon from occurring on both sides of the strip with a new surface. The purpose is to

[Structure of the invention]

In order to achieve the above-mentioned object, the present invention creates a protrusion for forming a thin-walled part, with one side edge on the thick inner side serving as a base as it goes from the tip side to the rear end. 1μ other
It is characterized by a b-shaped nen point that spreads out *1-dimensionally towards the m1 verandah.

[Actual rotation seconds 11] Hereinafter, an example of the present invention will be explained with reference to FIGS. 1 and 2. In addition, figure g1 is a perspective view of the gold pear 8 which is attached to this invention.

This mold 3 is for molding the irregular cross-sectional strip A shown in Fig.
each 11111 g (i has the opposite +hl'ju
i'! 2 and 32 are parallel to each other n: E protrusion i (
;4, ;(3 is formed each time. Protrusion: U8 is a preformed part 84 which is a molding of 1 μm of j′L thickness on the front end side, and a main molding of 1tllll at the rear end. It consists of a section 35.

Preforming part 84! d. A cross-section in which the side surface 82 and the main body 31 are at right angles, i. So I'm n. Therefore, as the slope 34a of the preforming part 84 and the upper surface of the mold body 8 move from the front end side force 1 to the rear end side, the first rule surface 32
As a result, the preformed portion 34 becomes separated from the
As it goes toward the rear end side, it becomes sub-width from the side surface 32, which is one l1l11 edge, toward the other side edge. Here, the height H at the rear end edge of the preformed part 34 is set to be equal to or greater than the step difference between the thick part and the thin part of the irregularly shaped shell. Further, the inclination angle of the slope 34H is set so that the slope 84a is substantially in contact with the four edges of the lower surface of the material (facing the mold 3) at the rear end edge of the preformed portion 84. In addition, the preforming part 3
Length I of 4! It is preferable to set it to about 3 fB of the feed amount per feed of the material.

In the main forming section 85, the Ueda 185a for finishing forming the thin-walled portion of the irregular cross-sectional strip is set at a constant height that is the same height as the rear end edge of the preforming section 34, and the slope continues to the slope 34a. 85b
is formed so as to be spaced apart from the side surface 32 toward the rear end l111. Therefore, the unformed portion 35 extends from the leading end to the rear end;
The upper surface 85a gradually expands toward the slope 85b with reference to the upper surface 85a. And by this n! The thin-walled part of one irregularly shaped strip is finished M2 from the thick-walled part side.

Therefore, when forming a strip with an irregular cross section using the mold 8 having the above configuration, the material is rolled by the mold 8 and the rolling roll 2, and the material is rolled by the mold 8 and the rolling roll 2. When the rolling roll 2 is in the unprocessed state, the material is fed by a predetermined amount. Then, by repeating the rolling process and the feeding of the material, a strip with an irregular cross section is formed.

Here, as shown in FIG.
The olfactory meat part side of the part WaO is first formed into a thinner part (see Fig. 2 (lj), (C'l)). Due to the holes, the parts 9t-Wa are finished formed sequentially from the thick side (see Fig. 2 (D)).Then, both side edges of the material W are finished formed in the final stage. The finished product is a strip with an irregular cross section.

As described above, according to the gold i48 of the present invention, since the edges of the material W are finished formed at the final injection stage, both side edges of the reinforcing material W are formed more easily than in the case of forming with a conventional mold. This will greatly reduce the occurrence of work hardening in the parts. With due care, both of the obtained n irregular cross-sectional strips (1i11
It is possible to prevent wave damage from occurring in the area.

In the above embodiment, the cross-sectional shape of the preformed portion 84 is a right triangle, but it may be rectangular.

In addition, the slope 85b of the main molding portion 35 may be made perpendicular to the upper surface of the mold body 81 to correspond to this.

〔Effect of the invention〕

As explained above, by using the mold for forming strips with irregular cross-sections of the present invention, the protruding strips for forming thin-walled portions become thicker from the tip side to the rear end side. -I on the flesh side
Since the holes are formed so as to gradually form holes on the other side edge side using the H11 edge as a reference, the forming process of the side edge part of the part that will be the thinner part of the material will be performed in the final stage. It is possible to reduce the shadow caused by work hardening of the edges, and thus to prevent the ripple phenomenon from occurring in the obtained strip with irregular cross section.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 (
A3-(E) is a diagram showing the molding process using the mold shown in Figure 1, Figures 3 and ψ are front views each showing an example of a strip with an irregular cross section, and Figure 3 is a diagram showing a conventional mold. A perspective view showing an example of the mold,
FIG. 6 is a plan view showing the material during molding using the mold shown in FIG. 7, and FIG. ...Mold, 31 ...Mold body, 33
...Protrusion. Figure 2 Figure 7 Figure 3 Figure 4

Claims (1)

[Claims] A cross section that is used when rolling a cross-section strip having a thin wall on at least one side and a thick wall on a portion adjacent to the thin wall, and has a protrusion for rolling the thin wall. In the mold for forming irregularly shaped strips, the protruding strips are formed so as to gradually widen from the tip side to the rear end side toward the other edge side with one side edge of the thick portion side as a reference. A mold for forming strips with irregular cross-sections.