JPH1177317A - Production of shape steel ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality and productivity of the shape steel ring which is made so that a shape steel, after coiled, is cut to a one piece length of the ring and the obtained material is subjected to twisting correction, both end aligning and flash butt welding. SOLUTION: A ring material B generated with twisting step difference to both ends is put in a shaping die 3 and is corrected for twisting by pressing with a roller 4b of a pressing tool 4, both ends of the material are aligned. The aligned part is tack welded under restraint of the die 3, The ring material, which prevents both end position deviation due to spring back by tack welding, is taken out from the die and is subjected to flash butt welding in a next process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a steel ring capable of producing a high-quality shaped steel ring with high productivity.

[0002]

2. Description of the Related Art Shaped steel rings are usually manufactured through the following steps. (1) Rolled section steel A as shown in FIG.
(2) a step of cutting out a ring material B as shown in FIG. 4 (c) having a length corresponding to one ring from the obtained coil;
(3) a step of straightening the ring material B, (4) a step of butting (butting) both ends of the ring material, and a step of flash pad welding (hereinafter, referred to as FBW) the joint of the ring material, and (5) A trim process for cutting the welding slag generated on the ring surface with a cutting tool, and (6) an expander process for rounding the ring.

[0003] The shape steel A shown in the figure is merely an example. For example, there is a sectional shape as shown in FIG.

[0004] A twist step of (H + α) is generated between both ends of the ring material B cut out in the above step (2), and twist is corrected in the next step to eliminate the step.

[0005]

As described above, the ring material cut from the coil is subjected to the twist correction, but even if this processing is performed, the twist step is not completely eliminated. For example, in the case of the ring material B of FIG. 4C having a height S = 40 mm, if the initial twist step is about (40 mm + 9 mm), as shown in FIG. 6, even after the twist correction, the step Δh is about 5 mm. And a gap g of about 5 to 6 mm is generated between both ends. This is due to the springback of the ring material.

In the conventional method, the ring material whose ends are slightly displaced in this manner is clamped by the electrode chuck of the FBW machine to weld the butt joint, but in this method, the ring material is spring-backed. Due to the force applied, it takes a considerable amount of time to join both ends, and it is difficult to correct the deviation of both ends even if it takes time, and a step is likely to be formed on the surface of the product after welding. Further, the cutting edge of the cutting tool tends to be chipped when the welding bar is trimmed due to the step, and the life of the cutting tool is shortened.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to produce a high-quality shaped steel ring in which both ends of a material are accurately joined with high productivity.

In the electrode chuck of the FBW machine, generally, only the upper electrode is provided with anti-slip teeth. However, this alone does not stabilize the clamp, the ring material slips, the effect of the upset is reduced, and the welding strength is reduced. Adversely affect Therefore, a solution to this problem is also provided.

Furthermore, conventionally, a flat shaped steel ring R as shown in FIG. 7 (a), the deformed section steel ring R ₁ as shown in FIG. 7 (b), a separate removal of welding slag S We are using a trim machine. As shown in FIG. 8, the ring R in FIG. 7A is set so that the center C is on the center line L and the welded portion where the slag S is generated is placed parallel to the center line. The horizontal tools T1 and T2 shown in FIG. 7 (a) are fed in the radial direction of the ring on the center line L to cut the welding knurls on the upper and lower surfaces, and the vertical tools T3 and T4 are set to Y in FIG. _1, Y can be scraped off welding slag of inner and outer peripheral surfaces by feeding vertically by _two points, such as irregular-shaped steel ring R ₁ in FIG. 7 (b), can not be removed Noro Lee portion that Chi paragraph. For this reason, separate trimming machines are used, but this is not preferable in terms of equipment costs and the like. Therefore, a method that can solve this problem is also provided.

[0010]

In order to solve the above-mentioned problems, in the present invention, the correction of the twist of the ring material and the alignment of both ends in the pre-process of welding are performed by the same circumferential length as the circumferential length of the outer peripheral surface of the ring material. In a shaping mold having a circular cavity, a method of pressing the ring material with a roller rolling on the ring material is performed.Furthermore, the joints at both ends of the ring material are temporarily attached by arc welding. Pull out from the mold and use for flash pad welding.

Further, in order to increase the joining strength of the joint, a non-slip tooth is provided on each of the workpiece gripping surfaces of the upper electrode and the lower electrode of the electrode chuck of the FBW welding machine. The ring material is clamped by the mold electrode, and flash-butt welding of the joint is performed.

Further, in order to integrate a welding-slot trimming machine, for a shaped steel ring having a step on the upper surface or lower surface, the shaped steel ring is arranged offset on the machine base, and the welded portion of the ring is formed. The cutting tool was cut in a direction perpendicular to the ring diameter to cut the upper and lower slag.

[0013]

According to the present invention, the ring material is twisted and the ends are aligned using a mold and a roller, and the material engagement portion is temporarily welded before the constraint by the mold is released. There is no displacement between both ends of the material. Therefore, it is not necessary to correct the displacement when setting the FBW machine,
The setting can be performed easily and quickly, and the welding surface can be trimmed without any displacement of the joining surface, and the quality of the product is improved.

Further, when the FBW is performed by clamping the ring material with an electrode chuck provided with anti-slip teeth on both the upper electrode and the lower electrode, the material does not slip at the time of upset, and the effect of the upset is reduced. Increases welding strength.
Furthermore, when the welding knurls on the upper and lower surfaces of the deformed shaped steel ring are removed by using a shape bite to cut the welded part of the ring where the shape bite is offset at right angles to the ring radial direction, the flat steel shape is removed. A simple ring trimming machine can be used for deformed steel, eliminating economic waste.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of a method for manufacturing a shaped steel ring according to the present invention will be described with reference to FIG. FIG. 1A shows F
1 shows an example of a twist correction device used in a pre-process of BW. The torsion correcting device 1 includes a drive motor (not shown)
, A shaping die 3 fixed on the table 2, and a pushing tool 4 which is raised and lowered by a hydraulic cylinder (not shown).

The shaping mold 3 has a circular cavity 3a having the same circumference as the circumference of the outer periphery of the ring material B, a tool 3c urged by a spring 3b, and a slide guide 3d for the tool. ing.

The pusher 4 is formed by horizontally mounting a roller 4b on a holder 4a. Several rollers (for example, 3 to 4) are provided radially at equal intervals. Further, the holder 4a is provided with a radially extending portion between the adjacent rollers so that tack welding can be performed at that portion.

As shown in FIG. 1B, the ring material B is put into the shaping mold 3 of the torsion correcting device 1 as shown in FIG. 1 (b), and then the pushing tool 4 is lowered to press the ring material B from above with the roller 4b. Turn the rotary table 2. In this step, the ring material B is pressed and corrected by the roller 4b rolling on the material, the both ends are brought into close contact, and the entire material becomes a perfect circle along the mold. Next, when the ring material B is removed from the mold 3 in this state, the both ends that have been brought together are shifted again by springback.

Therefore, the rotation of the table 2 is stopped, and preferably the pressing by the pusher 4 is continued to temporarily attach both ends of the mated material by arc welding. Thereafter, the ring material B is removed from the mold 3. . In this way, the joint state of both ends of the ring material is maintained by the temporary attachment, and the F
BW can be performed smoothly and accurately.

FBW is performed using an FBW machine. That F
The BW machine clamps the ring material and sends a welding current,
Further, an electrode chuck for applying an upset force is provided.
Here, as shown in FIG. 2, non-slip teeth 7 are provided not only on the upper die electrodes 5A and 5B of the electrode chuck but also on the work gripping surfaces of the lower die electrodes 6A and 6B to prevent opposing electrodes 5A and 6B.
A, 5B and 6B respectively clamp both ends of the ring material B, and in this state, 5B and 6B from the electrodes 5A and 6A side.
A current was supplied to the side or in the opposite direction, and an upset force was applied to perform the FBW of the joint portion of the ring material B.

Thereafter, trimming of the welding slag generated on the surface of the joint portion is performed. The trimming machine used may be an existing flat steel ring trimming machine that moves two horizontal tools and two vertical tools linearly.

When the ring to be trimmed is a deformed steel ring, as shown by a solid line in FIG.
₁ is set on the machine base with the center C offset from the center line L. The horizontal bytes T1, T2 that moves on the center line L, as shown in FIG. 3 (b), the figure byte that matches the shape of the upper and lower surfaces of the ring R _1, welding the horizontal figure bytes T1, T2 The upper and lower welding knurls S are removed by making cuts at right angles to the ring radial direction.

The welding slag on the inner peripheral surface of the ring R ₁ may change the set position of the ring R ₁ to the dashed line position of FIG. 3 (a), Y
_1, the vertical byte T3, T4 shown in FIG. 3 (b) with Y ₂ points may be carried out in longitudinal feeding methods, but FIG vertical bytes T3, T4 the rotation and lateral slides 90 ° in (b) Attach to a possible attachment (not shown), tool bit T3, T4
Is shifted to the points Y ₃ and Y ₄ in FIG. 3A, and the method of vertically feeding the bytes T3 and T4 is adopted, it is not necessary to change the ring set.

The welding of the flat steel ring is performed by the conventional method with the ring R set at the position of the chain line.

Further, the ring from which the slag has been removed is sent to an expander step, in which the ring is rounded out. This is the same as before.

[0026]

As described above, in the present invention, the twist correction of the ring material is performed using the mold and the roller, and the joints at both ends of the material are temporarily welded before the constraint by the mold is released. Therefore, there is no displacement of the both ends of the material due to springback, and the FBW in the next step can be performed smoothly and quickly, and the joining is performed accurately. In addition, since there is no step on the surface of the joint, damage to the cutting tool in the welding knurling trimming step is reduced, thereby improving product quality, improving productivity, and reducing processing costs.

Further, the FBWs at both ends of the ring material are replaced with FBWs having anti-slip teeth on the work holding surface of the lower electrode.
When using a machine, the effect of the upset is enhanced and the welding strength is also improved.

Further, when trimming of the welding knurls on the upper and lower surfaces of the deformed steel ring is performed by cutting the figure bite in a direction perpendicular to the ring radial direction with respect to the ring of the offset arrangement, the trim for the deformed steel ring is used. No special trim machine is required,
The effect of eliminating waste in equipment can also be obtained.

[Brief description of the drawings]

FIG. 1 (a) is a cross-sectional view of an example of a twist correcting device used for carrying out the method of the present invention. (B) A diagram in which a ring material is put in a mold. (C) A ring material in the mold is corrected by a roller. Diagram showing the state

FIG. 2 is a diagram showing a state where a ring material is clamped by an electrode chuck of an FBW machine;

FIG. 3 (a) is a plan view showing a state in which a ring is set on a machine of a trim machine. (B) A state in which welding knurls on the upper and lower surfaces of a deformed steel ring are cut with a figure bite. View along line I

FIG. 4 is a diagram showing a manufacturing process of a ring material.

FIG. 5 is a diagram showing another example of the cross-sectional shape of a section steel.

FIG. 6 is a perspective view of a ring material which has been straightened by a conventional method.

FIG. 7A is a diagram showing a trimmed state of a welding slag of a flat steel ring. FIG. 7B is a diagram showing a case where a welding slag of a deformed steel ring is cut in the same manner as in FIG.

FIG. 8 is a view showing a set state of a ring when performing the trim of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Torsion straightening device 2 Rotary table 3 Shaping mold 3a Cavity 3c Die removal tool 4 Pushing tool 4a Holder 4b Roller 5A, 5B Upper die electrode 6A, 6B Lower die electrode 7 Non-slip teeth A Shape steel B Ring material R Flat plate Shaped steel ring R ₁ Deformed steel ring T1, T2 Horizontal tool T3, T4 Vertical tool S Welding

Claims (3)

[Claims] After the coiling, the ring material cut to the length of one ring is subjected to straightening of the torsion and butt-joining of both ends, and the butt portion is flash-pad welded. In the method of manufacturing a shaped steel ring to be trimmed, the straightening of the ring material and the joining of both ends in the pre-welding process are performed in a shaping mold having a circular cavity having the same circumferential length as the circumferential length of the outer peripheral surface of the ring material. Performing the method of pushing the ring material with a roller rolling on the material, and furthermore, after temporarily joining the butt portions at both ends of the ring material by arc welding, extracting the ring material from the mold and subjecting it to flash pad welding. Characteristic method of manufacturing shaped steel rings. 2. A non-slip tooth is provided on a workpiece gripping surface of an upper electrode and a lower electrode of an electrode chuck of a flash pad welding machine, and a ring material is clamped by the upper electrode and the lower electrode. The method for manufacturing a shaped steel ring according to claim 1, wherein flash butt welding of the joint portion is performed. 3. The two horizontal cutting tools, which feed the trim of the welded slag generated on the shaped steel ring in the horizontal direction to remove the slags on the upper and lower surfaces, and send the trim vertically on the inner and outer peripheral surfaces of the shaped steel ring. Performing with a trimming machine having two vertical cutting tools to cut, for deformed steel rings with a step on the upper surface or lower surface, place the shaped steel rings offset on the machine base, and place a shape bite on the weld of the ring. 2. The method of manufacturing a shaped steel ring according to claim 1, wherein the cut is made in a direction perpendicular to the ring radial direction so as to cut off the upper and lower surfaces.