JPH0788526A - Steel billet turning device - Google Patents

Abstract

(57) [Abstract] [Purpose] When a steel slab is scratched and ground prior to rolling, it is possible to rotate a slab with a bend or twist to an arbitrary angle and hold it in that position. Reduce the amount of movement of the grinding wheel required for removal. [Structure] A pair of pedestals for supporting both ends of a steel piece and a chuck / turning means for gripping and turning the end of the steel piece are combined. The cradle is arranged in an inverted triangle and rotates freely 3
It consists of individual gears and an endless chain around them. The chuck / turning means comprises a pair of scissors-type chucks, and an opening / closing mechanism and a rotating mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for rotating a steel slab at an arbitrary angle about its axis and holding it at that position for scratch removal grinding prior to rolling the steel slab.

[0002]

2. Description of the Related Art For example, with respect to a steel slab which is a target of rolling of wire rods and small rods, it is important to find flaws on the surface thereof before rolling and remove the flaws by grinder grinding. It affects the productivity of the process and the quality of the product.

Usually, in the scratch removal grinding of a steel slab having a substantially square cross section with rounded corners, the upper surface of the steel slab conventionally carried by a walking mechanism is first ground, and then the steel slab is flipped up to 90. ° The procedure was repeated by turning over, exposing the side surface upward, and grinding. If there were scratches on the corners, the grinder's grindstone was moved along the cross-sectional shape of the steel slab to wrap around the side pieces.

Needless to say, the scratch removal grinding as described above is troublesome and often becomes an obstacle to automation. It is also desirable from the viewpoint of safety and quality control that the direction in which chips or grinding pieces fly is constant.

Therefore, with the intention of carrying out the scratch removal grinding of the corner portion of the steel slab in the same manner as the surface portion, the inventors have
Clamp one end of the billet with a scissors type chuck and
An attempt was made to perform grinder grinding while rotating at any angle such as °, 45 ° or 70 ° and holding it at that position.

However, since the steel pieces often have bending and twisting, there are problems that the steel pieces do not lie at a desired position even if they are clamped at one end only, or the positions are displaced due to the grinding process.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned obstacles and to carry out flaw removal grinding of a steel billet by rotating the billet holder about its axis and holding it at an arbitrary angle. This makes it possible to grind under the condition that it is not necessary to move the grindstone around the side surface of the steel piece as in the past, and this can be performed even for a material with bending or twisting. An object is to provide a turn retaining device.

[0008]

A billet rolling and holding device according to the present invention shows an overall structure in FIGS. 1 and 2 and has a substantially square cross section as shown in detail in FIGS. 3 and 4. Rectangular billets with bends and / or twists
A device for rotating (1) at an arbitrary angle around the axis of a steel slab and holding it at that position, which holds a pair of pedestals (2) supporting both ends of the steel slab and an end of the steel slab. Chuck to rotate
The pedestal (2) is composed of turning means (3), and the pedestal (2) is provided with three freely rotating gears (21A, 21B, 2) arranged in an inverted triangle.
1C) and an endless chain (22) around them and a mechanism for clamping steel pieces is added, and the chuck / turning means (3) comprises a pair of scissor-type chucks (3).
1), a mechanism (32) for opening and closing the chuck, and a mechanism (33) for rotating the gripped chuck together with the steel piece at an arbitrary angle around its axis.

Since the length of the billet varies, it should be possible to support the billet at two appropriate points accordingly. In order to meet this problem, in a preferred embodiment of the apparatus of the present invention, as shown in FIGS. 1 and 2, one of the pedestals is provided with its position fixed on the side close to the chuck / turning means. On the other hand, on the side far from the chuck / turning means, two or more pedestals are provided on the same extension line so that they can be moved up and down. By being placed in the lowered position, a pair of pedestals is formed together with the pedestal in the fixed position. In the illustrated example, No. 1
(Fixed) pedestal and No. 2 located from the end Steel slabs are supported by 4 pedestals.

If the billet is long and the span between the pedestals at both ends is long, the billet may vibrate. To prevent this, the pedestal located approximately in the center of the billet should be raised, but placed slightly lower than the pedestals at both ends, and the billet should be supported and clamped by soft touch.

Depending on the bending / twisting condition of the steel slab, when the steel slab is placed on the pedestal, the chuck whose one end is clamped may shake slightly vertically and horizontally with respect to the axis of the steel slab. Therefore, in a preferred embodiment of the device of the present invention, the chuck / turning means is placed on the elastic support base (4),
It is configured to absorb the vertical shake of the clamp due to the bending and twisting of the steel slab.

[0012]

Operation: Feeding of a steel slab to the steel slab roll holding device of the present invention,
What is the collection of steel slab after finishing processing such as scratch removal grinding?
Of course, the existing walking mechanism may be used.

The steel piece supplied to the pedestal is located outside the gear between the two (21A, 21B) forming the base of the freely rotating gears arranged at the vertices of the inverted triangle as shown in FIG. A natural calm way on the chain. Then, one end of the steel piece is grasped by the scissors-type chuck (31), and the steel piece is first rotated around its axis so that the surface to be ground faces up.

The chain slightly moves and changes its shape as the steel slab rotates, but it remains stable on the chain at any position. It will be readily understood that if the billet is twisted, the pedestal on the clamped end side and the pedestal on the opposite side will have different chain shapes.

The steel material which has been subjected to the scratch removal grinding on the upper surface is subsequently rotated by an angle of about 20 °, 45 °, 70 °, etc., so that the corner portion is brought to the upper side. Therefore, as shown in FIG. Scratch removal grinding can be performed with the grindstone (5) by the same movement of the grindstone.

It is appropriate that the chuck is opened and closed by a hydraulic cylinder, and as is known in the hydraulic arts, the hydraulic block is held by the closing of the solenoid valve to maintain the clamped state. Rotate at an angle. In the illustrated device, the rack and pinion mechanism is used for rotation, and the rotation angle is detected by a rotary encoder. Grinding can be automated by inputting the measured position and depth of the scratch on the steel slab to the scratch removing and grinding device in advance and turning the steel slab according to the data.

When one end of the steel piece is gripped and rotated, if the steel piece is bent or twisted, as described above, the chuck is slightly shaken up and down and / or left and right with respect to the rotation axis. In the device of the present invention, the left and right runout is
It can be absorbed by changing the position of the steel piece on the cradle chain. When it is necessary to absorb the vertical shake, it is preferable to follow the preferred embodiment in which the chuck / turning means is placed on the elastic support base. In the illustrated example, the two-stage bellows is the elastic support base (4), which utilizes the buffering effect of the air press-fitted therein.

[0018]

EFFECTS OF THE INVENTION By using the billet rolling and holding device of the present invention, a billet having an arbitrary cross-sectional shape and length within a certain range can be obtained.
It can be rotated to a position at an arbitrary angle with respect to the horizontal plane and held there, and its operation can be performed stably without being annoyed by the bending and twisting of the steel slab, so it can precede the rolling of the slab. Scratch removal grinding can be easily performed, and even when grinding a corner portion, it is not necessary to wrap the grindstone laterally of the steel piece as in the conventional case.

Therefore, it becomes possible to shorten the moving distance of the grindstone, shorten the time required for the movement to improve the productivity, and make the scattering direction of the cutting chips constant, and also from the viewpoint of safety and quality control. Be advantageous

Although the above description has focused exclusively on the flaw removal grinding of the steel slab, it goes without saying that the apparatus of the present invention can also be used for other work in which the steel slab needs to be turned and held.

[Brief description of drawings]

FIG. 1 shows an example of a billet rolling and holding device of the present invention,
The top view which shows the whole structure.

2 is a side view of the device of FIG.

FIG. 3 is a plan view showing details of a chuck / turning means in the apparatus of FIG.

FIG. 4 is a side view showing details of the chuck / turning means in the apparatus of FIG.

5 is a detailed view showing the structure and operation of a pedestal in the apparatus of FIG.

FIG. 6 is a view showing a condition of scratch removal grinding of a corner portion of a steel slab.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Steel piece 2 Cradle 21A, 21B, 21C Gear 22 Endless chain 23 Clamping mechanism 3 Clamping / turning means 31 Chuck 32 Opening / closing mechanism 33 Rotating mechanism 4 Elastic support 5 Grinding stone

Claims (3)

[Claims] 1. A device for turning a steel slab having a substantially square or rectangular cross-section and having bending and / or twisting at an arbitrary angle around the axis of the steel slab and holding the steel slab at that position. It consists of a pair of pedestals supporting near both ends of the piece and a chuck / turning means for gripping and turning the end of the steel piece. The pedestal is composed of three freely rotating gears arranged in an inverted triangle and those. The structure that consists of an endless chain around the outside of the shaft is added with a mechanism for clamping steel pieces, and the chuck / turning means is a pair of scissor-type chucks, a mechanism for opening and closing the chuck, and a chuck that holds the chuck together with the steel piece A billet rolling and holding device, characterized in that it has a mechanism for rotating it around any angle. 2. One of the pedestals is provided with its position fixed on the side close to the chuck / turning means, while two or more pedestals are provided on the same extension line on the side far from the chuck / turning means. A pair of pedestals is formed together with the pedestal in the fixed position by placing the pedestal in such a manner that it can be moved up and down, one of them corresponding to the length of the steel piece is placed in the raised position and the rest is placed in the lowered position. Claim 1 comprised as follows.
Steel billet rolling and holding device. 3. The billet rolling / holding device according to claim 1, wherein the chuck / rolling means is placed on an elastic support base to absorb vertical deflection of the chuck due to bending / twisting of the billet. .