KR102552876B1 - Processing method of iron and steel for producing steel structures - Google Patents

Abstract

Provides a steel processing method for manufacturing steel structural materials.

Description

Steel processing method for manufacturing steel structural materials {PROCESSING METHOD OF IRON AND STEEL FOR PRODUCING STEEL STRUCTURES}

The present invention relates to a steel processing method for manufacturing a steel frame structural material.

In general, steel is a combination of iron and steel, and is produced in a certain shape using a casting method and a forging method, and is used in various industrial fields. These steels can be classified into flat products, steel tubes, long products, cast steel, and section steel.

Here, the section steel is a steel product having various cross-sectional shapes as a rolled steel material for structural use, and is widely used for steel structure in construction, bridges, civil engineering, shipbuilding, etc. , can be subdivided into flat steel, circular steel, etc.

In particular, H-beams, etc., are widely used as structural members such as steel frames for construction, bridges, earth retaining works, or temporary materials for various constructions. Depending on the purpose or use, etc., cutting, hole processing, or chamfering is performed to make structural members or temporary materials for construction. Various processing operations are being performed, such as performing.

However, steel products such as section steel have high strength, so there are considerable difficulties and risks in performing processing operations such as cutting or chamfering, and conventional mechanical cutting devices used for cutting and processing of steel materials are mainly If you have technical limitations of being used only for straight cutting, have problems with cutting at various angles, and have difficulty in assembling work on site due to poor precision in processing steel materials for structural members or temporary materials for construction is common

In addition, in the prior art, there was a problem that not only the work efficiency due to the processing operation was lowered during processing of steel, but also the processing time was long and continuous operation was difficult. As a result, there was a problem of low productivity.

In addition, conventionally, when processing steel, a lot of dust and residues such as cutting powder and cutting powder are generated. In such a working environment, since workers continue to process processing, there is a problem with a high possibility of causing respiratory diseases.

The problem to be solved by the present invention is to provide a steel processing method for manufacturing a steel frame structural material.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

The steel processing method of the present invention for solving the above problems is a steel processing method for manufacturing steel structural materials by processing steel materials having a certain length, including section steel, and placing steel materials, including section steel, on a roller-type transfer conveyor. A transfer step of transferring processing in the direction of work progress in the state; A cutting step of straight-cutting or slanting-cutting a certain portion of the front end side of the steel material transferred through the transfer step and placed on the cutting device using a cutting means; A hole processing step of processing a hole on a steel material by drilling using a drilling machine for the cut steel material transported through the cutting step; A chamfering step of shaving angled corners using a chamfering device having a rotary chamfering blade for the cut and hole-processed steel materials transported through the hole processing step; Including, the cutting device for the cutting step, a fixed work table; In the state of being located at the rear of the fixed workbench, one side is supported and coupled to an upright hinge axle, and the other side is coupled to a rail so that movement is guided along a rail member of an arc-shaped structure, and is provided to enable rotational movement and rotation angle adjustment, the rail A rotating workbench that enables inclined cutting as well as straight cutting on the steel side according to the arrangement state on the member; A support that is fixedly coupled to the upper surface of the other side of the rotary workbench and installed upright; The upright hinge shaft and the support are supported on the support, the rotation angle is adjusted in response to the rotation direction of the rotary work table, and in addition, it is provided to be individually movable up and down, and cutting means to perform cutting work by motor drive a body having; an elevating cylinder equipped with a rod unit coupled to the main body to pull up and down movement of the main body; a first fixed support plate and a second fixed support plate fixedly installed and disposed at intervals on the upper edge of one side of the fixed work table and the rotary work table, respectively; a first forward/backward displacement cylinder positioned on and fixedly coupled to an upper surface of the other side of the fixed workbench, having a support plate coupled to the front end surface of the rod part, and provided to move forward and backward toward the first fixed support plate; A second forward/backward cylinder which is positioned on the upper surface of the other side of the rotary workbench and is fixedly coupled to the support side, has a support block coupled to the front end surface of the rod part, and is provided to move forward and backward toward the second fixed support plate; The transfer conveyor is located at the rear of the rotary workbench and the front of the fixed workbench, respectively, and is provided to perform continuous transfer processing of steel materials, and a transfer roller is provided on the fixed workbench and the rotary workbench to enable the transfer of steel materials, respectively. One or more are provided, and the cutting means may be characterized in that it is installed to be located between the fixed work table and the rotating work table.

According to the present invention, it is possible to easily manufacture various steel structural materials that can be used as structural members or temporary materials for construction by processing steel materials such as H-beams, and increase efficiency in processing steel materials and manufacturing steel structural materials.

The present invention automatically transfers steel materials such as H-beams, but can perform cutting, hole, and chamfering processes in a continuous process, and can achieve usefulness that can increase work efficiency and increase productivity while reducing processing time. .

In the present invention, in the cutting process of steel materials, not only straight cutting but also inclined cutting by adjusting the rotation angle of the cutting device is possible, so workability according to steel processing can be improved, and on-site assembly between steel frame structures can be improved by precision processing. can provide usefulness.

The present invention can achieve usefulness that can be implemented to have functionality such as corrosion resistance, durability, and non-contamination for a steel structure material manufactured through post-processing.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a schematic process diagram showing a steel processing method for manufacturing a steel frame structural material according to an embodiment of the present invention.
2 is a detailed detailed process diagram showing the cutting step in the steel processing method for manufacturing a steel frame structural material according to an embodiment of the present invention.
3 is a schematic facility diagram shown to explain a steel processing method for manufacturing a steel frame structural material according to an embodiment of the present invention.
4 and 5 are configuration diagrams shown to explain a cutting device used in a cutting step in a steel processing method for manufacturing a steel frame structural material according to an embodiment of the present invention.
6 is an exemplary view showing a steel frame structural member of an embodiment processed by a steel processing method for manufacturing a steel frame structural member according to an embodiment of the present invention.
FIG. 7 is a conceptual view planarly showing that a steel frame structural material is fixed in a straight cutting step in a modified example of the present invention.
8 is a conceptual diagram showing in plan that a steel frame structural material is fixed in an inclined cutting step in a modified example of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only these embodiments are intended to complete the disclosure of the present invention, and are common in the art to which the present invention belongs. It is provided to fully inform the person skilled in the art of the scope of the invention, and the invention is only defined by the scope of the claims.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements. Like reference numerals throughout the specification refer to like elements, and “and/or” includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

As shown in FIGS. 1 to 3, the steel processing method for manufacturing a steel frame structure according to an embodiment of the present invention includes a transfer step (S10), a cutting step (S20), a hole processing step (S30), and a chamfering step (S40). ) is composed of a configuration including

In addition, post-processing may be further performed on the result of the chamfering step (S40), which may include a rust removal step (S50) and a coating layer forming step (S60).

The transfer step (S10) is a step of transferring for processing of steel materials including H-beams, etc., in a state in which unprocessed steel materials having a certain length are seated and placed on the roller type transfer conveyor 10 in the direction of work progress. This is the step of transferring to.

In the cutting step (S20), a predetermined portion on the front end side of the steel material 1 transferred through the transfer step (S10) and placed on the cutting device 100 is cut in a straight line or inclined by using a cutting means 151. This is the cutting process.

The cutting device 100 installed for the cutting step (S20) is disposed between the transfer conveyor 10 for the transfer processing of the steel material 1, and adjusts the rotation angle for the inclined cutting process with respect to the steel material 1 are provided to make this possible.

To this end, the cutting device 100, as shown in FIGS. 4 and 5, is provided to the height of the transfer conveyor 10 and is fixedly installed on the fixed work table 110 and at the rear of the fixed work table 110. In the positioning state, one side is supported and coupled to the upright hinge axle 101 and the other side is coupled to the rail so that movement is guided along the rail member 130 curved in an arc-shaped structure, so that the rotation angle can be adjusted by rotational movement It is provided and includes a rotary work table 120 that enables not only linear cutting on the steel material 1 side but also inclined cutting according to the arrangement on the rail member 130.

The hinge shaft 101 is provided to be rotatable by motor drive through motor coupling, and may be provided to automatically adjust the rotation angle of the rotating work table 120 according to a control signal.

At this time, the rotary work table 120 includes a rail coupling block 121 rail coupled to the rail groove 131 formed on the outer circumferential surface of the rail member 130 having an arc-shaped structure, but on the rail coupling block 121 It is preferable to configure the rotational movement of the rotating work table 120 to be stopped by combining the brake lining 122 and contacting the rail groove 131 of the rail member 130 at the time of a stop signal.

Here, since the rotation by motor drive is used for the hinge axle 101, the rotation angle can be precisely adjusted through the rotation speed control, and precise work can be performed at the desired inclination angle, resulting in assembling between steel structures in the field can do good.

The upper surface of the other side of the rotary work table 120 is provided with a support 140 fixedly coupled thereto and installed upright.

The main body 150 equipped with the cutting means 151 is supported and coupled to the upright hinge axle 101 and the support 140, and the rotation angle is adjusted corresponding to the rotation direction of the rotary work table 120, and individually As is provided to be able to move up and down.

At this time, the cutting means 151 is provided to perform the cutting operation by operating by motor driving.

The cutting unit 151 may be equipped with a band saw or a circular saw operated by rotational driving of a motor, and sometimes any one selected from a laser cutting machine using a laser, a gas cutting machine using gas, and a plasma cutting machine using plasma may be used. may be

The band saw may be provided in an endless track rotation type by the rotational drive of the motor, and the circular saw may be provided to travel forward and backward on the main body through driving means using a servo motor and a ball screw together with rotational drive by the motor. The rest of the laser cutter, gas cutter, or plasma cutter may also be provided to travel forward and backward on the main body through a driving means using a servo motor and a ball screw.

The main body 150 to which the cutting means 151 is mounted is provided with an elevating cylinder 160 so as to be movable in the up and down direction, and the rod part of the elevating cylinder 160 is coupled to the main body 150 so as to It is provided to pull up and down movement with respect to.

A first fixed support plate 172 and a second fixed support plate 174 for use in supporting and fixing the steel material during cutting and processing of the steel material 1 are provided at the upper edge of one side of the fixed work table 110 and the rotary work table 120, respectively. They are fixedly installed, respectively, and are spaced apart in the forward and backward directions.

On the upper surface of the other side of the fixed worktable 110, a first forward/reverse cylinder 182 provided to move forward and backward toward the first fixed support plate 172 is fixedly coupled and positioned, and a rod for supporting and fixing the steel material 1 A support plate 182a is coupled to the front end surface of the portion.

On the upper surface of the other side of the rotating work table 120, a second forward and backward cylinder 184 provided to move forward and backward toward the second fixed support plate 174 is located. ) is fixedly coupled to the side and a support block 184a is coupled to the front end surface of the rod part.

The transfer conveyor 10 is located at the rear of the rotary work table 120 and at the front of the fixed work table 110, respectively, so that the steel material 1 can be continuously transported.

It is preferable to provide one or more freely rotating transfer rollers on the fixed work table 110 and the rotary work table 120 to enable the transfer of the steel material 1, respectively.

At this time, the transfer roller may be configured to control rotation by rotational driving of the motor.

The cutting means 151 provided on the main body 150 is installed to be positioned between the fixed work table 110 and the rotary work table 120.

That is, the cutting step (S20) can be carried out in detailed steps as shown in Figure 2 using the cutting device 100 having the configuration as described above.

In other words, the cutting step (S20) includes the first step (S21) of determining the processing form of straight cutting or inclined cutting for the steel material 1 such as H-beam, and the processing form determined through the first step. Adjust the position for cutting on the side of the cutting device accordingly, but arrange the fixed work table and the rotary work table in a row in the case of linear cutting, and rotate and move the rotary work table to adjust the rotation angle in the case of inclined cutting. The second step (S22) of adjusting the arrangement of the main body having a main body, and the transfer step (S10), transfer the steel material (1) to the upper surface of the rotating work table 120 and the fixed work table 110 of the cutting device 100 In the third step (S23) of locating the front end of the steel material, the first forward and backward true cylinder 182 and the second forward and backward true cylinder 184 on the side of the cutting device 100 are simultaneously operated to In the fourth step (S24) of supporting and fixing the first fixed support plate 172, the support plate 182a, the second fixed support plate 174 and the support block 184a, and in the state in which the steel material was supported and fixed through the fourth step A fifth step (S25) of positioning the cutting means 151 so that the steel material can be cut by lowering the elevating cylinder 160 and controlling the lowering of the main body 150; It can be carried out to include a sixth step (S26) of straight cutting or inclined cutting of the steel material 1 in a desired shape by operating the cutting means 151.

In addition, although not shown in the cutting step (S20), an inhaler for forcibly inhaling the cutting material discharged to the cutting device 100 and its surroundings when cutting the steel material through the cutting means 151, and through the inhaler By having a configuration including a duct unit for transporting and discharging the cut pieces of steel materials that are forcibly sucked in, and a dust collector for collecting and processing the cut pieces that are connected to the duct and suctioned and discharged, the working environment is improved by removing the cut pieces. can be processed to do so.

At this time, the inhaler may have one or more, and through a configuration in which an electromagnet capable of on/off control of a magnetic field is installed in the inlet, the removal efficiency of the cut pieces of steel can be further increased.

The hole processing step (S30) is performed by drilling using the drilling machine 200 for the cut steel material 2 to be transported after the cutting step (S20) performed using the above-described cutting device 100 This is a step of machining a hole on the steel material (2).

At this time, the drilling machine 200 may be configured to have a first drill that moves up and down, and a second drill that moves forward and backward toward the steel material 2 in the lateral direction.

In the chamfering step (S40), the chamfering processing device 300 having a rotary chamfering blade is used for the cut and hole-processed steel material 3 to be transported through the hole processing step. This is the refinement step.

In addition, the rust removal step (S50) of post-processing the steel material after the chamfering step is a step of removing rust by polishing or sandblasting the surface of the steel material using an abrasive.

Through the rust removal step (S50), an excellent coating layer can be formed during the subsequent coating layer forming step (S60).

The coating layer forming step (S60) is a step of forming a coating layer to express color as well as imparting functionality such as corrosion resistance, durability, and non-contamination to the surface of the steel material that has passed through the rust removal step (S50). .

To this end, in the coating layer forming step (S60), 20 to 50 parts by weight of an epoxy resin for adhesion to steel materials or a modified polyolefin resin having a polar group, 20 to 50 parts by weight of a base resin for high corrosion resistance, durability and weather resistance, color expression It can be formed by applying a mixed composition containing 5 to 10 parts by weight of a pigment for and 10 to 30 parts by weight of an additive resin for imparting non-staining properties.

At this time, the base resin is a urethane-modified water-dispersible alkyd polyol resin containing fatty acids, a urethane-modified alkyd resin, a silane-modified acrylic polyol resin, and a polyester-modified polyester having an aliphatic polyhydric alcohol having a hydroxyl group in consideration of eco-friendliness, dustproofing, soundproofing, and glossiness. Any 1 type or 2 or more types selected from water-soluble resins, such as a urethane resin, can be mixed and used.

As the additive resin for imparting the non-staining property, any one or two or more selected from among polyalkylsilicate, polyvinyladene fluoride, homopolymer polyvinyladene fluoride, silicone resin, melamine resin, and unsaturated polyester resin may be used in combination. .

Here, the polyalkyl silicate preferably has a structure in which the main chain and side chain are substituted with an alkyl group, a methyl group, or an ethyl group, and the silicone resin has a hydrolyzable silyl group at the terminal or side chain. It is preferable to use a cross-linked silicone resin. do.

On the other hand, in order to improve the working environment even in performing the hole processing step (S30), chamfering step (S40), and rust removal step (S50), the drilling machine 200, the chamfering processing device 300, and rust removal On the device side, one or more inhalers for forcibly sucking the cutting chips of steel materials are further installed, and the cutting device 100 side is connected to a duct for transporting and discharging the cutting chips to be configured to collect dust through a dust collector. may be

Accordingly, in the present invention, as shown in FIG. 6, various steel structural materials that can be used as structural members or temporary materials for construction can be manufactured in a form having a straight cut or inclined cut structure, and the overall processing time of the process It can provide the advantages of improving work efficiency, productivity, and improving the working environment while reducing

On the other hand, in the steel processing method for manufacturing a steel frame structural material according to a modified embodiment of the present invention, the steel material 1 is obliquely arranged by the rotation of the rotary work table 210 in the fourth step S24 of the cutting step S20 On the other hand, since the first forward and backward true cylinder 182 and the second forward and backward true cylinder 184 perform linear motion, it was invented to solve the problem that the steel member 1 is not properly fixed.

In order to solve the above problem, the first fixed support plate 172 includes a first housing 172-1, a first temperature controller (not shown) built in the first housing 172-1, and a first housing 172-1. A first support plate 172-2 disposed adjacent to the housing 172-1 and embedded in the first housing 172-1 have one end supported by the first housing 172-1 and the other end supported by the first housing 172-1. A plurality of first springs 172-3 supporting the support plate 172-2 may be included.

In addition, the second fixed support plate 174 includes the second housing 174-1, a second temperature controller (not shown) built in the second housing 174-1, and the second housing 174-1. The second support plate 174-2 disposed adjacent to and embedded in the second housing 174-1, one end supported by the second housing 174-1 and the other end supported by the second support plate 174-2 It may include a plurality of second springs (174-3) for supporting.

In addition, the support plate 182a is connected to the first forward/backward cylinder 182 by a rotation connector (for example, a hinge), and the support block 184a is connected to the second forward/backward cylinder 184 and a rotation connector (for example, a hinge). , hinge).

Furthermore, the plurality of first springs 172-3 and the plurality of second springs 174-3 are formed of a unidirectional shape memory alloy, and may contract below a first temperature and expand above a first temperature (by design). The reverse case also exists due to change, expansion below the first temperature, contraction above the first temperature).

In this case, the other ends of the plurality of first springs 172-3 are embedded in the first housing 172-1 and not exposed to the outside in a contracted state below the first temperature (conversely, at or above the first temperature). Accordingly, although the first support plate 172-2 is elastically connected by the plurality of first springs 172-3, it actually comes into contact with the first housing 172-1 so that the first housing 172-1 It can be rigidly supported by Similarly, in a contracted state below the first temperature, the other ends of the plurality of second springs 174-3 may not be exposed to the outside by being embedded in the second housing 174-1, and accordingly, the second support plate 174-3 2) is elastically connected by the plurality of second springs 174-3, but can be substantially supported by the second housing 174-1 in contact with the second housing 174-1.

Conversely, in an expansion state above the first temperature (conversely, below the first temperature), the other ends of the plurality of first springs 172-3 are exposed to the outside of the first housing 172-1, and thus the first The support plate 172-2 may be elastically supported by the plurality of first springs 172-3. Similarly, the other ends of the plurality of second springs 174-3 are exposed to the outside of the second housing 174-1 in the expansion state of the first temperature or higher, and accordingly, the second support plate 174-2 has a plurality of second springs 174-3. It may be elastically supported by two springs (174-3).

As a result, when straight cutting is determined in the first step 21 of the cutting step 20, the electronic control unit (not shown) determines that the first temperature control device and the second temperature control device are connected to the first housing 172-1. The temperature of the second housing 174-1 is controlled to be set below the first temperature (or higher than the first temperature in the reverse case), and accordingly, the first support plate 172-2 and the second support plate 174-2 are cut. It is rigidly supported in the fourth step S24 of step 20, and eventually the first support plate 172-2, the support plate 182a, the second support plate 174-2, and the support block 184a are the steel material 1 (In this case, since the steel materials are arranged in a straight line, rotation of the support plate and the support block by the rotation connector does not occur).

Furthermore, when it is determined in the first step 21 of the cutting step 20 that the slanted cutting is performed, the electronic control unit determines that the first temperature controller and the second temperature controller operate on the first housing 172-1 and the second housing 174. Control the temperature of -1) to be higher than the first temperature (or lower than the first temperature in the reverse case), and accordingly, the first support plate 172-2 and the second support plate 174-2 of the cutting step 20 In the fourth step (S24), it is elastically supported, and finally, the first support plate 172-2, the support plate 182a, the second support plate 174-2, and the support block 184a conform to the oblique arrangement of the steel material 1 It can be fixed in parallel (in this case, since the steel materials are arranged at an angle, rotation of the support plate and the support block occurs by the rotation connector).

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (1)

In the steel processing method for manufacturing a steel frame structural material by processing steel materials having a certain length, including section steel,
A transfer step of transferring steel materials, including section steel, in the direction of work progress in a state in which steel materials are seated and arranged on a roller-type transfer conveyor;
A cutting step of straight-cutting or slanting-cutting a certain portion of the front end side of the steel material transferred through the transfer step and placed on the cutting device using a cutting means;
A hole processing step of processing a hole on a steel material by drilling using a drilling machine for the cut steel material transported through the cutting step;
A chamfering step of shaving angled corners using a chamfering device having a rotary chamfering blade for the cut and hole-processed steel materials transported through the hole processing step; Including,
The cutting device is
fixed work table; In the state of being located at the rear of the fixed workbench, one side is supported and coupled to an upright hinge axle, and the other side is coupled to a rail so that movement is guided along a rail member of an arc-shaped structure, and is provided to enable rotational movement and rotation angle adjustment, the rail A rotating workbench that enables inclined cutting as well as straight cutting on the steel side according to the arrangement state on the member; A support that is fixedly coupled to the upper surface of the other side of the rotary workbench and is installed upright; It is supported and coupled to the hinge shaft and the support, the rotation angle is adjusted in response to the rotation direction of the rotary worktable, and together with this, it is provided to be individually movable up and down, having a cutting means to perform a cutting operation by a motor drive main body; an elevating cylinder equipped with a rod unit coupled to the main body to pull up and down movement of the main body; a first fixed support plate and a second fixed support plate fixedly installed and disposed at intervals on the upper edge of one side of the fixed work table and the rotary work table, respectively; a first forward/backward displacement cylinder positioned on and fixedly coupled to an upper surface of the other side of the fixed worktable, having a supporting plate coupled to the front end surface of the rod part and moving forward and backward toward the first fixed supporting plate; a second forward/backward cylinder positioned on an upper surface of the other side of the rotary workbench and fixedly coupled to the support, having a support block coupled to the front end surface of the rod part and moving forward and backward toward the second fixed support plate; Including,
The transfer conveyor is located at the rear of the rotary workbench and the front of the fixed workbench, respectively, to perform continuous transfer processing of steel materials, and one transfer roller is provided on the fixed workbench and the rotary workbench to enable the transfer of steel materials, respectively. The above is provided, the cutting means is installed to be located between the fixed work table and the rotary work table,
The first fixed support plate includes a first housing, a first temperature control device built into the first housing, a first support plate disposed adjacent to the first housing, and built into the first housing so that one end of the first housing is installed in the first housing. Supported by the housing and the other end including a plurality of first springs supporting the first support plate,
The second fixed support plate includes a second housing, a second temperature control device built into the second housing, a second support plate disposed adjacent to the second housing, and built into the second housing so that one end thereof It is supported by two housings and the other end includes a plurality of second springs supporting the second support plate,
The cutting device further includes an electronic control unit for controlling the first temperature regulating device and the second temperature regulating device according to straight cutting and slanting cutting,
The support plate is connected to the first front and rear cylinders by a rotation connector, and the support block is connected to the second front and rear cylinders by a rotation connector,
The plurality of first springs and the plurality of second springs are formed of a unidirectional shape memory alloy, shrink below a first temperature and expand above a first temperature, so that the plurality of first springs are contracted below a first temperature. The other ends of the springs are embedded in the first housing and are not exposed to the outside, and the other ends of the plurality of second springs are embedded in the second housing and are not exposed to the outside. The other end of the spring is exposed to the outside of the first housing and the other ends of the plurality of second springs are exposed to the outside of the second housing,
The electronic control unit controls the first temperature controller and the second temperature controller to set the temperatures of the first housing and the second housing to less than a first temperature in the case of straight cutting, so that the plurality of first springs And making the plurality of second springs in a contracted state, and in the case of inclined cutting, the first temperature controller and the second temperature controller control the temperature of the first housing and the second housing to a first temperature or higher Steel processing method for manufacturing a steel frame structural material, characterized in that to make the plurality of first springs and the plurality of second springs in an expanded state.

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