JPS59201713A - Shearing method and apparatus thereof - Google Patents

Abstract

PURPOSE:To reduce the generation of burr by reducing the sectional area of an article to be sheared such as thick-plate shaped continuous steel material, etc., into a constricted state before said article is sheared and applying closed-type shearing onto the constricted part thereafter. CONSTITUTION:In the previous stage to shearing, a pair of a lower blade 4 and a lower clamp 18 in lock state is pulled-up towards a pair of an upper blade 1 and an upper clamp 19 in lock state, with respect to an article to be sheared which is set on a pass line P, by means of a main cylinder 12 and a main ram 10, and the article is pressed between the main cylinder and the main ram and plastically deformed to form a constricted part corresponding to a chevron shaped-shaped section. During the execution of shearing in the posterior stage, the above-described constricted part is sheared by the upper blade 1 and lower blade 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for shearing an object to be sheared, such as a thick continuous steel material;
33 J: Regarding equipment.

There are two types of shearing methods: open shearing and closed shearing.Open shearing is when the shearing surface is on the soil or surface of the object to be sheared, and b. gentle burrs occur, and the burrs become long during rolling in the subsequent process. This can lead to a decrease in yield and other causes. On the other hand, closed shearing is less likely to cause defects on the sheared surface, but requires a large amount of force, and as the blade wears, burrs will form on the upper and lower surfaces.

On the other hand, in the present invention, prior to shearing, the cross section of the object to be sheared is reduced into a constriction, and at this constriction I! It is designed to perform J-chain shear.

Since the preform in the previous step limits the sheared surface to the center of the object to be sheared, and closed shearing is performed in the later step, shear defects are less likely to occur, and even if defects occur, they are limited to the center of the object to be sheared. Therefore, defects do not extend for a long time during rolling in the subsequent process, and defects caused by the shear plane do not appear in the rolled material, resulting in no reduction in yield. The preform in the first stage is open forged, and the shearing in the second stage is a shear of a small cross section, so it does not require a large amount of force unlike normal closed shearing, and it is easy to get caught in the rolling mill during rolling in the subsequent process. There are positive benefits such as:

In the case of running shear, to accomplish this stepwise shear,
It is necessary to synchronize the indentation formation in the former stage and the shearing operation in the latter stage in relation to the movement of the object to be sheared. By allowing the actual shearing of the later stage and the preform of the earlier stage to operate in a continuous series of motions, the aforementioned synchronization problem is elegantly solved.

In order to achieve these objectives, the shearing method of the present invention pinches the object to be sheared from above and below using a set of upper blades and upper clamps and a set of lower blades and lower clamps that form a chevron-shaped cross section when combined. Constrictions corresponding to the chevron cross-sectional shape are formed on the upper and lower surfaces of the object to be sheared through plastic deformation, and subsequent to the constriction forming step, the constrictions are J = J=shaped on the upper and lower blades. It is characterized by performing closed shearing.

In addition, the invention of a shearing device related to the above-mentioned shearing method is such that in a closed shearing machine, each tool rest is connected to the upper clamp that is combined with the upper blade and the lower clamp that is combined with the lower blade, respectively, on the side opposite to the shearing saw. A removable locking device is provided in between, and when the locking device is in the locked state, the set of the upper blade and the upper clamp, which form a chevron-shaped one-sided shape, and the silk of the lower blade and the lower clamp are actuated as one body to constrict the object to be sheared. In addition, when the locking device is in the unlocked state, the object to be sheared can be sheared closed at the constriction by the two blades and the lower blade. Tozuru.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 J5 and FIG. 2 show a vertical side view and a front view of an embodiment of the method d5 and apparatus of the present invention, in which the equipment is incorporated into a pull-up running shear.

As a facility for performing the later stage shearing, the upper blade 1 is attached to the upper tool rest 3 of the upper blade frame 2, and the lower blade 4 facing the upper blade 2 is the lower blade of the lower blade frame 5, that is, the lower blade of the shear frame. It is attached to stand 6. For up-cutting, the lower blade 4 rises relative to the upper blade 2 to perform shearing operation.

Therefore, the lower blade frame 5 has seat frame rolls 7.7 that extend upward from both sides of the lower tool rest 6 and the upper blade frame 2.
guided vertically through guides 8.8 on both sides of the
It is formed integrally with the shear frame platen 9 that connects the upper ends of both columns 7.7, and the platen 9 has a downward main ram 1.
0 is taken.”

On the other hand, the upper blade frame 2 is integrally formed with the guides 8.8 on both sides of the upper tool rest 3 and the upper blade adjustment device 11.11 that adjusts the height position of the upper blade 1 on both sides. A main cylinder 12 that fits into the main ram 10 is formed upwardly between the shear frame platen 9 and the main ram 10, and on both sides there are lifting cylinders for pulling back the shear after the shear is operated by the liquid UN-lift of the main ram 10. 13.13 is stepped.

The upper blade frame 2, which supports the Ushi 1 Fu frame 5 in the guide 8.8 and the cylinder 12.13. , rails 15. laid on the base 14.14 on both sides.
15, four rollers 16.16 or wheels are provided that run on the upper blade adjustment device 11.11, and a worm shaft 17.1 with a worm gear (7-1 screw mechanism) is installed.
1, it is possible to adjust the height position of the upper blade 1 above the pass line [ ] of the object to be sheared S (see FIG. 3 and subsequent figures).

In addition to the configuration of this pull-up type shearing machine, a lower clamp 18 is provided which is attached to the lower tool rest 6 so that it can be raised and lowered, and which is combined with the lower blade 4. An upper clamp 19 is provided which is mounted and combined with the upper blade 1. The clamps 18 and 19 are each provided with locking devices 20 and 21, in this example a set of swivel locking bars, which can be attached and detached between the locked state and the unrotated state on the rear side opposite to the side facing the object to be sheared.

In the locked state of the locking devices 20 and 21 shown in FIG.
One comes to the height of the upper blade 1, and this phase also forms a chevron-shaped cross section and faces each other. Even if the phase of the lower blade 4 and lower clamp 18 is raised relative to the pair of upper blade 1 and upper clamp 19, both clamps 18
．． 19 resists the amount of shearing force in the locked state and does not escape. In the present invention, in the previous stage, the object to be sheared on the pass line P is directed toward the set of the upper blade 1 and the upper clamp 19 in the locked state, and the lower blade 4 and the lower clamp 1 in the locked state.
The phase 9 is pulled up by the main cylinder 12 and the main ram 10, and the object to be sheared is compressed and plastically deformed between them to correspond to the chevron cross section (forming the fin portion).

In order to perform shearing in the later stage of the method of the present invention, the lower clamp 18 is provided with a lower clamp cylinder 22 between it and the lower tool post 6, and the lower clamp cylinder 22 is used to connect the lower clamp 18 and the upper blade 1. Similarly, the upper clamp 19 clamps the object to be sheared, and the upper clamp cylinder 23 is provided between the upper cutter ω3 and the object to be sheared between the upper clamp 19 and the lower blade 4. Provides a function to prevent jumping.

During shearing, the locking devices 20 and 21 are released so that the lower clamp 18 and upper clamp 19 can move following the shearing operation, and in this way the upper blade 1, the lower blade 11, etc.
Performs later stage shearing of the waist.

The method and apparatus of the present invention have been explained above in relation to the structure and operation of the apparatus, but the explanation can be divided into operation steps as follows.

3.4.5 and 6.7, 8.9d3 and 10 are 1
The state of each operating stage between shear cycles is shown.

Figure 3 shows a slab S, which is an object to be sheared, placed on a roller table 2.
4 shows the shear standby state when the repass line 1 is transported in the direction of arrow a.

Figure 4 shows the state of the preform in the previous stage. After the shearing command, the shear moves forward in synchronization with the slab S, and the lower blade 4
is rising. Since the upper blade 1 and the upper clamp 19 and the lower blade 4 and the lower clamp 18 are integrated by the clamp lock devices 21 and 20, respectively, a chevron-shaped ( A recessed portion C can be formed.

Figures 5 and 6 show a state in which the lower blade 4 has stopped shearing upward, the load on the lock bar has been removed, and the locks 20 and 21 have been released.

FIG. 7 shows a state in which after the clamp lock is released, the upper and lower clamp cylinders 22 and 23 clamp the slab S, and the lower blade 4 is further sheared upward to perform closing shearing.

FIG. 8 shows a state in which the lower blade 4 is lowered while the slab S is clamped by the clamp cylinders 22 and 23 after shearing is completed.

Figures 9 and 10 show that after the lower blade 4 has been lowered, the sheared slab is carried out at high speed, and the shear is returned to the standby position.
．． - The state in which the upper and lower clamps 18 and 19 are returned to the locked state is shown.

FIG. 11 (-1(b)(c>, b, and (2) indicate the order of shearing operation according to the present invention: upper blade 1, lower blade 4,
Upper clamp 19, lower clamp 18Q) Mutual positional relationship is shown.

Figure 12 shows the state before the tip of the slab S, which has been sheared (fin portion C'T'') according to the present invention, is bitten by the roll R of the subsequent rolling mill. It is known that

Figure 13 (in) indicates that when the conventional shearing method is used, defects A such as burrs on the sheared surface move to point A' of the plate S' after rolling and the amount of cropping increases. Figure (b) shows a relationship in which, when shearing according to the present invention, the defect B on the shear plane moves to point B' on the rolled sheet S', resulting in a decrease in cropping amount.

Above, Akira Konohana was explained in detail using the pull-up type running shear type as an application example, but the shear type is not limited to the pull-up type, but also the bushing type, down-cut type, pull-down type, and up-and-down type. It can be cut type. Further, the following mechanism for moving the cutting object in front of the shrine for inter-travel shearing may be limited to a bogie running type, and may be a swinging type or the like. Further, the present invention is applicable not only to running shear but also to stopped shear. Further, the clamp lock device is a swing type [J Tsukuba set is shown, but other types such as a link type, wedge type, hydraulic cylinder type, or a combination thereof may be used. All of these non-essential changes are within the scope of the invention.

As described above, according to the present invention, the following effects can be obtained.

(I) Since the shear plane is limited to the center of the slab by the preform, there are no defects caused by the shear plane during rolling in the subsequent process.

(II) Because it is preformed, it is easily caught in the rolling mill.

(III > Since it is a closed shear, it is difficult to create a fracture surface,
Therefore, there are no defects caused by the fractured surface during rolling in the subsequent process.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of one embodiment of the method and device of the present invention in which the equipment is incorporated into a pull-up type running shear, Fig. 2 is a front view thereof, and Fig. 3 is an overlay. Figure 4 is a vertical side view when preforming, Figure 5 is a vertical side view when the crank block is open, Figure 6 is its front view, and Figure 7 is a vertical side view when shearing is completed. , Fig. 8 is a vertical side view when the lower blade is lowered, Fig. 10 is its front view, and Fig. 1
Figures 1 (A), (B), C) and (D) are diagrams showing the positional relationship of slabs, blades, and clamps in the order of shearing operation, Figure 12 is a side view of the rolling mill biting state, and Figure 13 (I). ) and (b) are diagrams showing the state of defect migration on the sheared surface according to the conventional method and the present invention. 1...Upper blade, 2...Upper blade frame, 3...Upper turret, 4...Lower blade, 5...Lower blade frame (to 17-frame) 6...Lower turret , 7... Shear frame column, 8... Turret guide, 9... Shear frame platen, 10... Main ram, 11... Upper blade adjustment device, 12... Main cylinder, 13...・・Lifting cylinder, 1
4... Base, 15... Rail, 16... Roller, 17... Worm shaft, 18... Lower clamp,
19 upper clamp, 20...lower clamp lock device,
21... Upper clamp lock device, 22... Lower clamp cylinder, 23... Upper clamp cylinder, 24...
... Roller table, P ... Pass line, S ... Sheared object, a ... Direction, C ... Constriction, R ... Roll, s' ... Rolled plate, △, A ' , B, B'...Defect. Patent Applicant Agent Name Kei 3 Tukan 4 Zu Rhyme 5 ¥ 6 Diagram 7 Diagram 8 Diagram Procedural Amendment (Side 1. Indication of Case 1982 Patent Application No. 756
21 No. 2, Title of the invention Shearing method and device 3, Relationship with the person making the amendment Patent Representative Fuyuhiko Maki 4, Agent 650

Claims (2)

[Claims] (1) The upper blade and upper clamp set and the lower blade and lower clamp set, which form a chevron cross-sectional shape in the combined state, pinch the object to be sheared from above and below to plastically deform it and correspond to the chevron cross-sectional shape. (The shearing method is characterized in that a fin is formed on the upper and lower surfaces of the object to be sheared, and the fin is subjected to closed shearing by an upper blade and a lower blade following the fin part shape step. Method. (2) In a closed shearing machine, a removable locking device is installed between the upper clamp that is combined with the upper blade and the lower clamp that is combined with the lower blade and the turret on the side that opposes the shearing force, respectively. When the locking device is in the locked state, the upper blade and upper clamp set and the lower blade and lower clamp set, which form a chevron-shaped cross-section, are operated as one body to clamp the object from above and below to form a constriction in the object to be sheared. A shearing device characterized in that the object to be sheared can be sheared closed by the upper blade and the lower blade at the constriction part when the locking device is in an unlocked state.