JPS5973103A - Production of bar having deformed section - Google Patents

Abstract

PURPOSE:To obviate generation of a twist, etc. and to improve productivity by using plural grooved rolls which are different in the length in parallel parts on both sides of each groove, and rolling a blank material while exerting a rolling force only on the part of the blank material to be worked to a small thickness in the parallel parts successively from the grooved rolls having the narrower parallel parts. CONSTITUTION:Rolls 3, 5, 7 consist of a pair of flat rolls and rolls 2, 4, 6 are constituted of grooved rolls 21, 41, 61, one of each of which has a groove part 9. The parallel parts 22, 42, 62 on both sides of the groove parts 9 of the rolls 2, 4, 6 are made successively longer from the roll 2 toward the roll 6. Thereupon a blank material 1 is passed between the rolls and is rolled by the rolling force exerted only on the part of the material 1 to be worked to a small thickness successively from the rolls of the set having the narrower parallel parts, whereby the width in the thin walled part is gradually widened. The part of the material 1 positioned in the groove parts 9 of the rolls 21, 41, 61 is buckled and deformed into the parts 9 in the stage of each rolling.

Description

[Detailed description of the invention] This invention manufactures a so-called irregular cross-section strip, which has a continuous portion in the longitudinal direction of which the plate thickness is changed in the width direction, by a rolling method. It is related to the method.

When manufacturing irregular cross-section strips by rolling, a method has been used in the past in which strips of the same thickness are partially rolled by varying the rolling reduction ratio. The amount of deformation of the material differs depending on the magnitude of the rolling reduction, and this difference in deformation results in a difference in the elongation of the material in the rolling direction6, causing uneven deformation and twisting in the CJJE rolled strip. It was causing this.

As a method of preventing the occurrence of screw threads in the rolled portion, a so-called horizontal rolling roller spacing rolling method has been used in which the amount of deformation caused by C1 rolling is released in the width direction. However, in the horizontal rolling method, the material to be rolled is rolled perpendicularly to the longitudinal direction of the material, resulting in poor workability and poor productivity.

On the other hand, the tentering rolling method is a method in which the material is deformed in the direction of the width Ij by suppressing processing in combination with a molding tool, but in the case of this method, the processing is intermittent. However, since it is necessary to avoid reciprocating motion of the rolls, it is not possible to reduce machining speed marks, and there is a drawback that improvement in production efficiency cannot be expected.

Apart from the method of rolling, there is a method of forming the desired change in plate thickness by cutting, but this method naturally has the fundamental drawback that a cutting layer is created, resulting in a large loss of material. It is something.

The purpose of this invention is to eliminate the drawbacks of the prior art described above,
The object of the present invention is to provide an improved manufacturing method using a rolling method that is highly productive and does not cause twisting due to non-uniform deformation.

According to the present invention, this purpose is achieved by using a plurality of grooved rolls with different lengths of the parallel parts on both sides of the groove, and sequentially starting with the grooved roll having the narrower parallel part and adding to the thickness of the thin material. This can be achieved by applying a rolling blade only to the parallel portion and rolling it out.

With this method, the amount of deformation of the material rolled in the parallel parts on both sides of the groove flows into the groove, and as a result, the unrolled part that is displaced in the groove is buckled by the force C due to the flow. Since it absorbs the amount of deformation in the rolling part, it is possible to prevent uneven shapes such as cracks and twists due to differences in deformation in the width direction of the plate (C').

The metal material C applicable to this invention is copper, copper alloy,
General non-ferrous metals such as aluminum and aluminum alloys, ferrous materials, and composite materials made of combinations thereof are mentioned, and in particular, the application of lead frame materials for power transistors, such as P1 to SINQ1 ζ1, to copper and copper alloys. It is possible.

This defense will be explained below with reference to the drawings.

As shown in Figure 1, material 1 consists of 6 sets of 1-ru 2°3.4
.

Each of the 1-rolls 3, 5 and 7 in Figure 2, Figure 4 and the fourth set in Figure 1 () consists of a pair of flat rolls.
．． The rolls 2, 4 and 6 of the third and fifth phases are shown in FIGS. and 61. However, the parallel parts 22 on both sides of the iM part 9 of the -C each 1''-le. The lengths of /12 and 62 are different, and the lengths increase in order from the first set.

A flat material 1 having a predetermined width and thickness is first passed between the first silk swirl roll 2 and a flat [J-ru] 23, centering around the center point 9, to form a parallel portion of the grooved roll 2. It is rolled down at 22. At this time, most of the flow of material due to the deformation of the thin-walled part moves to and is absorbed by the part 111 that is located in the i%'i part 9 where no reduction blade is applied, and the part 111 is seated in the groove 9. bend and deform.

Therefore, there is a difference in wall thickness in the width direction, and there is almost no difference in elongation in the longitudinal direction or in the rolling direction, and the material 11 does not deform into a seaweed shape after rolling.

This raw material 11 continues to pass through the second [I]-rule 3, and the rolled portion 111 is rolled flat, forming a material 12 with thin-walled portions 112 at two locations midway in the width direction.

Next, the M shrine 12 passes through the third set of rolls 4 and the first set of [''-
It is deformed in the same manner as by roll 2, and further flattened by roll 5. As a result, the width of the thick-walled portions 113 on both sides is reduced and the width of the thin-walled portions 132 is increased.This material 13 further passes through the fifth and sixth rolls 6 and 7 to form the thick-walled portions 133 on both sides. disappears and the material 16 close to the product roars.

Incidentally, a copper strip with a thickness of 3.0 mm and a width of 58 mm is
8mm, 1”-le width is 38mm, 5/Imm and 80
Three types of grooves different from mm (''-le 21.'11 and 61
The thickness of each thin section 112, 132 and 152 is 0.
Although it was rolled to 9 mm, after each rolling, the thin part 112,
132 and 152 were flat without any waves.

The material 16 obtained in this way is then heated and annealed in order to finish the form of plate thickness change to the predetermined \J method, and then, as shown in FIG. passed through.

If it is necessary to adjust the hardness of the mill and to make the hardness uniform, this rolling process may be continued after the previous sixth set of rolls 7.

As shown in FIG. 4, the seventh silk roll 8 is a grooved roll 81 with one side having a stepped groove 82 with a cross section equal to the product cross section. ll'', corresponding to the wall thickness ratio of the material 16-
C can be rolled at almost the same rolling rate. Therefore, the raw material 17 is stretched almost uniformly in the longitudinal direction or the rolling direction by passing it through the roller 8, and is finished into a predetermined cross-section by the XJ method, resulting in a product 18.

During this time, the rolling at the reduction rate may be carried out in several portions with heating annealing in between.

Concretely the above concrete example - (1q) After heating and annealing the prepared material 16 at 450'C for 30 minutes, grooves [J-Rule 81] were used to make the thick part 2.0 mm and the white part 0.6 mm. Reduction rate approximately 30
%, then heat annealed this cumulative part and re-roll the thick part by 1
．． The product was finished rolled to a thickness of 26 mm and a RI white part of 0.38 M, and the desired product was not found to have any waviness in the thin wall part or any twisting in the entire strip.

As described above, according to the present invention, the material is rolled in several passes from the middle in the width direction of the material in order to avoid rolling down the thick-walled parts in a woody manner, and the material close to the product is rolled by 1τ. , it is possible to obtain strips with irregular cross-sections as efficiently as with ordinary grooved roll rolling, there is no waste such as cutting layers, and the surface quality is as good as that of rolled materials at a low price. It has the advantage that it can be used, and its industrial value is great.

In the previous example, the partial rolling method Doji-C tandem method was shown, but this may also be a batch method.

In addition, we have shown a case where the roll is flat as a counterpart to the grooved roll in partial rolling, but in this case the material is forcibly deformed into the groove. The convex portion may be stepped so as to obtain the desired shape.

Of course, as long as the direction of deformation and covering in the groove is constant C', both can be grooved rolls and C can be used. Also, regarding the shape of the groove, we have shown a case where the cross section is semicircular, but this can be done without adding a reduction blade to the shape of the groove that is deformed in the groove.
:stomach.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams showing an example of the method according to the present invention. FIG. 1 is a diagram showing the process of forming the material, and FIG. Figure 1 and Figure 3 show the condition of the part.
The figure shows the rolling process that follows the forming process. Figure 4 shows the culm.
Figure C' shows the state of the rolling part shown in the figure. 1, 11.12----17: Material, 18: Product, 21.41.61 and 81: 1ilJ-le, 9 and 82
: Groove, 111.131 and 151: Buckling deformation part, 112.1
32 and 152: thin part, 22, /12 and 62: parallel part, 113 and 133: thick part on both sides,

Claims (1)

[Scope of Claims] 1 J3 is a method of manufacturing and covering n1 irregular cross-sectional strips in a longitudinal direction in which parts with partially different plate thicknesses are partially different in the width direction by a rolling method, and at least one of the strips has a groove i=J. Using multiple sets of rolls with different lengths of the parallel parts on both sides of the grooves of the rolls, only the part of the material to be processed into a thinner plate in sequence starting with the set of rolls with the narrower parallel parts. A method characterized in that the width of the thin-walled portion is gradually widened by rolling with a reduction blade, and at the same time, at each rolling, the portion of the material that is placed in the groove of the grooved roll is buckled and deformed into the groove. . 2. Rolling method of irregular cross-sectional strips with partially different thicknesses in the width direction in the longitudinal direction
In the j-'J method, at least one of the rolls is a grooved roll, and a plurality of sets of rolls are used, in which the lengths of the parallel portions on both sides of the grooves of the grooved rolls are different. Sequentially, the rolling blade is applied only to the part to be processed into a thin plate of the material, and the width of the CB meat part is gradually widened, and at the time of each rolling, the part covered by the groove of the grooved roll of the blank H is rolled. The process of avoiding buckling deformation into the groove part and the process of rolling the material through this process are approximately the same -f depending on the width direction plate thickness ratio.
A method characterized by comprising a step of rolling at a rolling ratio of 120. 3. In the method described in item 1 or 2, the lj method is characterized in that after rolling by each groove roll, the portions deformed into the groove are rolled flat. 4 In the method described in Section 21jl or Section 3 above-
, a method characterized by heating and annealing the material before rolling at the same rolling T-rate.