JPH071066A - Manufacture of member having cross-sectional odd shape and its device - Google Patents

Abstract

PURPOSE:To manufacture a member having cross-sectional odd shape with high efficiency and low consumption of energy with a simple equipment by which a material is pressed using a specific grooved roll permitting width deformation but restraining longitudinal extension of the material. CONSTITUTION:An upper roll 3B is soroban-shaped ball with gentle inclination having projecting and recessing parts 8 on both conical side surfaces in near axial direction arranged with equal angle each other. A lower roll 4B is provided with parallel projecting and recessing parts 9 on its surface in the axial direction. The material to be rolled is heated to a temperature in which it is easily hot rolled in a heating furnace and bitten between the upper and lower rolls to be rolled. When the material is rolled, the width deformation of material is permitted but slip of the material and rolls is prevented and the longitudinal moving of the part of material in the vicinity of its surface is restrained by projecting and recessing parts 8 and 9 on the upper and lower rolls in the axial direction. Thus waving of material is little since longitudinal extension is restrained. Further, number of rolling is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for obtaining a product having a different cross-section material, that is, a cross-section having a shape different from that of a normal plate material or wire material, by rolling or spinning from a metal material.

[0002] In this specification, the term "rolling" is used to include rolling of a ring-shaped body called spinning.

[0003]

2. Description of the Related Art For example, in the case of manufacturing a bar steel having a shallow groove that is deepened from both edges toward the center by rolling, conventionally, hot rolling was performed by using a rolling roll as shown in FIG. There is. That is, the upper roll (3A) in the shape of an abacus ball with a gentle inclination that is driven to rotate by force.
And the lower roll (4A) having the flanges (41, 42) on both sides, the rolled material (1) is bitten into it to form a cross section defined by the profiles of the upper and lower rolls.

In the hole rolling of FIG. 1, the amount of deformation differs depending on the position of the material in the width direction. The thin portion at the center has large rolling deformation, and the thick portions on both sides have zero rolling deformation.
For this reason, the thin portion greatly extends in the length direction of the material, and a rolled material undulating in the length direction is formed. In order to avoid this, a large rolling reduction is not performed at a time and the rolling reduction rate is 3 ~.
Deformation of about 10% is accumulated, and if necessary, the material to be rolled is reheated.

In such rolling, it is first necessary to prepare a large number of hole type rolls having different profiles.
Moreover, products with irregular cross-sections are often produced in small quantities in a wide variety of products such as turbine blades made of heat-resistant steel, titanium seawater sluice screens, titanium-containing aircraft sashes, etc., and roll costs are extremely high. I have a worry that I will do it.

A similar problem is encountered with the production of profiled rings by the rotary ironing spinning method as shown in FIG. In FIG. 2, a ring (2) is attached to a mandrel (6A) that has a flange (61) and is driven to rotate.
The inside of the ring is brought into contact, and the outside of the ring is provided with a spinning roll (5A) which is partially brought into contact therewith and is rotatable,
By rolling the ring (2) between the mandrel (6A) and the spinning roll (5A) while forcing the latter in the width direction as indicated by the arrow, the ring thickness is sequentially increased from right to left in FIG. To decrease. (7)
Is an induction heating coil for maintaining the ring at the hot working temperature.

In such processing, the rolling reduction per pass may be within the ductility range of the material, and if the material has good workability, it is about 60% in cold working and about 15 in hot working. Even when the pressure is reduced to%, the pressure-reduced portion of the ring does not extend in the circumferential direction but only in the width direction, and a deformed cross-section ring with good shape accuracy is obtained. However, in the hot working of the difficult-to-machine material, the reduction ratio is less than 15%, and the number of passes must be increased, so that the working time becomes long and the electric power required for the induction heating for preventing the temperature drop during that time becomes enormous. .

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems associated with the rolling of deformed cross-section materials, and to reduce the number of steps more efficiently than before by using simple equipment to achieve high efficiency and reduction. It is an object of the present invention to provide a technique capable of manufacturing a modified cross-section material with the required energy consumption.

[0009]

A method for producing a modified cross-section material according to the present invention is a method for producing a modified cross-section material by rolling, in which the surface of a rolling roll having a modified cross-section profile is
A set of grooved rolls with a large number of concavities and convexities arranged in parallel in the axial direction or arranged at substantially equal angles to each other was used to allow deformation in the width direction of the material to be rolled but suppress elongation in the length direction. It is characterized by rolling under the conditions.

Since the rolled material obtained by the above rolling has the groove of the roll transferred to the surface and is usually unsuitable for the final use as it is, in many cases, the rolling using the group of grooved rolls is not succeeded. Thus, it may be necessary to include a finish rolling with a set of finishing rolls having an irregular cross-sectional profile but a smooth surface to obtain a smooth surface similar to the conventional one.

The apparatus of the present invention constructed in consideration of such matters is also an apparatus for manufacturing a modified cross-section material by rolling, which is parallel to the axial direction on the surface of a rolling roll having a modified cross-section profile, or With a set of grooved rolls having a large number of irregularities arranged at substantially equal angles to each other,
In addition, the present invention is characterized in that it is provided with a set of smooth rolls having a modified cross-sectional profile for finish rolling the material to be rolled rolled by the set of grooved rolls.

[0012]

The apparatus shown in FIGS. 3 and 4 is one in which the present invention is applied to the rolling equipment corresponding to the hole rolling roll of FIG. As shown in FIG. 3, the upper roll (3B) is in the shape of a gently sloping abacus ball, has concavities and convexities (8) that run substantially concentrically on the conical surfaces on both sides, and are arranged at equal angles to each other. The roll (4B), as seen in FIGS. 3 and 4,
It has parallel irregularities (9) running axially on the surface. Figure 4
Although the unevenness shown in (1) is provided with a U-shaped groove on the roll surface, the shape of the groove is arbitrary, and it goes without saying that a ridge may be provided instead of the groove or together with the groove.

The material to be rolled is heated in a heating furnace to a temperature suitable for hot working and is rolled between the upper and lower rolls. Upon rolling, the unevenness of the upper and lower rolls in the axial direction allows deformation of the material in the width direction, but prevents slippage between the material and the roll and restricts movement of parts near the surface of the material in the longitudinal direction, As a result, since the elongation in the longitudinal direction is suppressed, the rolled material is less likely to wavy.

When the present invention is applied to the rotary ironing spinning process shown in FIG. 2, the device shown in FIG. 5 is obtained. As shown in the figure, the spinning roll (5B) has a shape similar to that of the upper roll of the hole-rolling shown in FIG. 3, and has grooves (8) arranged at equal angles to each other. Mandrel (6
B) has a flange (61) on one side and has parallel grooves (9) in the axial direction. The mandrel is driven to rotate, and the spinning roll is driven to rotate and fed in the direction of the arrow.

In this apparatus, the material (2) is heated to an appropriate temperature in the heating section, sandwiched between a mandrel and a spinning roll, and a part of the material in the width direction is rolled. After one rotation to roll the entire length, the spinning roll is fed at a constant speed in the direction of the arrow to continue rolling. This operation is repeated as many times as necessary, and only a desired width is rolled to a predetermined thickness to obtain a modified cross section ring.

Similar to the above-described rolling of the steel strip shown in FIGS. 3 and 4, the axial irregularities provided on the spinning roll and the mandrel allow deformation in the width direction of the material but suppress elongation in the longitudinal direction. It is rolled down to realize ring rolling with high dimensional accuracy.

[0017]

【Example】

[Embodiment 1] Using the apparatus shown in FIGS.
S304 steel was rolled. The upper roll has a diameter of 250 mm,
The body length is 25 mm, the conical surface has a tilt angle of 15 °, the lower roll has a diameter of 250 mm, and the distance between both flanges is 48 mm. Both rolls were provided with semi-circular grooves having a depth of 0.3 mm and a width of 0.6 mm on the surface at intervals of 0.6 mm (in the upper roll, at the small diameter end). The material to be rolled has a plate thickness of 15 mm, a width of 40 mm and a length of 2 m.

The material was heated to 1100 ° C. and rolled.
The rolling reduction was changed by changing the distance between the two rolls, and a limit was found where the required flatness could not be maintained due to the corrugation of the corrugation in the center of the plate. For comparison, rolling was also performed using a smooth roll having the same size. The results are shown in Table 1.

Table 1 Reduction ratio (%) 4 6 8 10 12 14 16 18 20 Smooth roll ○ ○ × × × Grooved roll ○ ○ ○ ○ ○ ○ × × × ○ was able to be rolled satisfactorily without waviness. Also, a cross indicates that a wave has occurred and the product has failed.

Example 2 A titanium alloy (6% Al-4% V-Ti) was subjected to spinning using the apparatus shown in FIG. The spinning roll has a diameter of 250 mm, a body length of 50 mm, and an inclination angle of 30 °. The mandrel has a diameter of 300.
mm, body length 400 mm was used. Both of them have a semi-circular groove with a depth of 0.2 mm and a width of 0.4 mm on the surface with an interval of 0.4 mm.
Set up in. The object to be rolled is a ring-shaped body having a thickness of 20 mm, a width of 70 mm and an outer diameter of 450 mm.

The material was heated to 1050 ° C. and spun. The feed per pass was set to 2 mm, various reduction ratios were given, and it was investigated whether or not warpage in the width direction of the ring band occurred when rolling up to 5 passes. This utilizes a phenomenon in which when the pressed portion expands in the lengthwise direction (circumferential direction of the ring), that portion becomes longer than the unpressed portion, so that the band warps.

In this case as well, processing was carried out using a smooth roll under the same conditions, and comparison was made. The results are shown in Table 2.

Table 2 Reduction ratio (%) 10 15 20 25 30 35 40 45 Smooth roll ○ ○ × × × Grooved roll ○ ○ ○ ○ ○ ○ ○ × × ○ is substantially warped in the width direction of the ring band. Not present, × indicates that it occurred.

[0024]

According to the present invention, it is possible to realize a high reduction rate in one rolling when rolling a modified cross-section material, so that it is not necessary to prepare a large number of rolling rolls having different profiles and carry out rolling stepwise. Simplifies equipment and processes.
This helps reduce the manufacturing cost of the profiled cross section.

The fact that the number of rolling steps can be reduced means that the time required for rolling is shortened at the same time. Therefore, in hot or warm rolling, it is necessary to eliminate the need for intermediate reheating or reduce the number of times. to enable. This saves energy required for heating and further contributes to cost reduction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of an apparatus for explaining an example of a rolling technique of a deformed cross-section material.

FIG. 2 is a cross-sectional view similar to FIG. 1 for explaining another example of the rolling technique of the profile material.

FIG. 3 is a view showing a case where the rolling technique for deformed cross-section material according to the present invention is applied to the apparatus of FIG. 1.

4 is an enlarged cross-sectional view of the lower roll shown in FIG.

FIG. 5 shows a rolling technique for a modified cross-section material according to the present invention.
Figure when applied to the device of.

[Explanation of symbols]

1 band material 2 ring material 3A, 3B upper roll 4A, 4B lower roll 41, 42 flange 5A, 5B spinning roll 6A, 6B mandrel 61 flange 7 induction heating coil 8, 9 groove

Claims (3)

[Claims] 1. A method for producing a modified cross-section material by rolling, comprising a plurality of irregularities arranged on one or both surfaces of a pair of rolling rolls in parallel in an axial direction or arranged at substantially equal angles to each other. Using a set of grooved rolls,
A method for producing a deformed cross-section material, which comprises rolling under a condition in which deformation of the material to be rolled in the width direction is allowed but elongation in the length direction is suppressed. 2. The method according to claim 1, further comprising the step of finishing rolling with a set of finishing rolls having a modified cross-sectional profile but having a smooth surface, following the rolling with the set of grooved rolls. 3. An apparatus for producing a modified cross-section material by rolling, wherein one or both surfaces of a pair of rolling rolls have a large number of concavities and convexities arranged in parallel in the axial direction or arranged at substantially equal angles to each other. With a set of grooved rolls,
An apparatus for producing a modified cross-section material, comprising a set of smooth rolls having a modified cross-section profile for finish-rolling a material to be rolled rolled by the set of grooved rolls.