JP3233854U - Pretreatment equipment and pretreatment method for structural steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pretreatment apparatus for a mold steel. SOLUTION: A heat treatment device 71 used for heat-treating a mold steel work waiting to be processed to 250 ° C. to 350 ° C. and carrying out the heat-treated mold steel work is connected to an outlet of the heat treatment device 71. Includes a roller conveyor 72 used to move the heat-treated shaped steel workpiece to a post-process cutting apparatus. The roller conveyor 72 includes a roller 73, a bearing 74, and a frame 75, and ceramic heating elements are evenly arranged on the inner wall of the roller. One end of the roller 73 is one end of the bearing 74, and the other end of the bearing 74 is a motor. It is connected to and drives a roller to rotate in the frame 75. The tilt angle of the roller conveyor is horizontal so that the angle at which the liquid medium is ejected from the subsequent medium nozzle follows the moving direction of the mold steel work and the tilt angle is between 25 ° and 35 ° with respect to the mold steel work. It is provided 10 ° to 20 ° higher than the above. [Selection diagram] Fig. 1

Description

The present invention relates to the field of structural steel processing, and more particularly to a pretreatment apparatus and pretreatment method for a structural steel.

Mold steel is often used in the manufacture of cold punch dies, hot punch dies, and die casting dies, and its high hardness makes it difficult to process. During processing, the equipment acting on it may shift and move.

In order to facilitate cutting, the prior art often reduces the difficulty of processing the structural steel by heat treatment. However, the structural steel itself also has thermal fatigue characteristics, and the heat treatment during processing, especially the heat treatment quenching temperature, affects the austenite crystal grain size of the cut surface of the structural steel, the solid solubility of the alloying elements, and the uniformity of the work surface structure. In addition, it affects the overall thermal fatigue performance of the finished product of the structural steel work.

In particular, after the conventional structural steel workpiece leaves the heat treatment apparatus during machining, the temperature of the workpiece drops sharply, which may affect the crystal structure on the surface, and the crystal structure is transformed into an inward thermal transformation layer. , Affects the stress strength of the work, and makes the work during machining easily deformed and cracked.

An object of the present invention is to provide a pretreatment apparatus and a pretreatment method for a shaped steel in order to solve a defect of the prior art.

First, in order to achieve the above object, a heat treatment apparatus for heat-treating a mold steel work waiting to be machined at 250 ° C. to 350 ° C. and carrying out the heat-treated mold steel workpiece is connected to an outlet of the heat treatment apparatus for heat treatment. The subsequent mold steel work is moved to a cutting machine in a subsequent step, the roller conveyor includes a roller, a bearing and a frame, and ceramic heating elements are evenly arranged on the inner wall of the roller, and one end of the roller is At one end of the bearing, the other end of the bearing is connected to a motor to drive the roller to rotate in the frame, and the other end of the roller is connected to an electrode connection tube containing metal electrode rings on both inner and outer sides. The inner metal electrode ring protrudes from the outer metal electrode ring, the two metal electrode rings each have a stable electrical connection to the two electrodes of the ceramic heating element, and the two metal electrodes are respectively contained in the frame. A first contact piece and a second contact piece that are in stable electrical contact with the ring are installed, and the first contact piece and the second contact piece are separated by an insulating material, and the first contact piece and the second contact piece are separated from each other by an insulating material. Each of the contact pieces supplies stable power to the two electrodes of the ceramic heating element through the two metal electrode rings, and after the power is supplied, the ceramic heating element applies a constant temperature in the first temperature range to the outer wall of the roller. In order to provide the metal uniformly, the mold steel work after the heat treatment is slowly annealed on the roller conveyor to the first temperature range and maintained at this temperature, and the roller conveyor is separated from the heat treatment apparatus above the roller conveyor. Placed in place and used to spray a liquid medium onto the surface of a mold steel workpiece that has been annealed to a first temperature range, said liquid medium is an oily medium heated to a first temperature range and said oily. A metal powder is also mixed with the medium, the metal powder containing a medium nozzle containing any one or a mixture of nano-level iron powder, renium powder, titanium powder, tungsten powder, manganese powder, chromium powder, magnesium powder, and the like. Includes horizontal and vertical rolling mills installed at the rear end of the medium nozzle with respect to the moving direction of the mold steel workpiece and alternately arranged, and the distance between the rolls in the rolling mill is the mold steel. Submit a pretreatment device for mold steel including rolling mills at 80% to 90% of the workpiece size.

Optionally, in the pretreatment apparatus, the first temperature range reaches at least 250 ° C.

As an option, in the pretreatment apparatus, the roller conveyor is provided with an inclination angle of 10 ° to 20 ° from the horizontal plane, and the angle of the liquid medium sprayed from the medium nozzle is along the moving direction of the mold steel work. , 15 ° downward with respect to the horizontal plane.

As an option, in the pretreatment apparatus, the ceramic heating element is an MCH ceramic heating element.

As an option, in the pretreatment apparatus, a tank main body is further provided below the roller conveyor, and the width of the tank main body is smaller than the length of the roller and larger than the size of the structural steel work, and the tank main body has a width of the tank main body. The depth is higher than the height of the two-layer roller conveyor, a through hole for passing the roller is provided on the side surface of the tank body, and heat released from the ceramic heating element is further inside the tank body. A reflective coating is applied to reflect and maintain the temperature of the structural steel workpiece.

Next, in order to achieve the above objectives, a pretreatment method for the structural steel was also submitted, and the procedure is as follows.

Step A1: The mold steel work waiting to be processed is heat-treated to 250 ° C. to 350 ° C., and the heat-treated mold steel work is carried out. Step A2: Ceramic heating elements are installed on both the upper and lower sides of the mold steel work after being carried out, the temperature of the mold steel work is maintained at 250 ° C. or higher at the temperature discharged from the ceramic heating element, and the mold steel work is kept at 250 ° C. or higher per hour. Anneal slowly at an annealing rate not exceeding 30 ° C. Step A3: A liquid medium is sprayed on the surface of the mold steel work before rolling, and the liquid medium is an oil-based medium heated to 250 ° C., and the metal powder is also mixed with the oil-based medium, and the metal powder is nano-level. Includes any one or a mixture of iron powder, renium powder, titanium powder, tungsten powder, manganese powder, chromium powder, magnesium powder. Step A4: The mold steel work is subjected to horizontal rolling and vertical rolling, and the distance between each roll of the rolling mill during the rolling is between 80% and 90% of the shape of the mold steel work. It has become.

As an option, in the pretreatment method, the angle of the liquid medium sprayed from the medium nozzle is an inclination angle between 25 ° and 35 ° with respect to the moving direction of the mold steel work.

In the present invention, the ceramic heating element provided in the roller transfer device keeps the structural steel work waiting to be machined within the first temperature range, whereby the crystal characteristics of the surface of the structural steel work do not change due to a sudden change in temperature. Can be guaranteed. Further, the present invention sprays a liquid medium containing nanometal powder through a medium nozzle to a place on the surface of the work where it is going to come into contact with a rolling mill. Therefore, while the structural steel of the present invention is being rolled, the medium can avoid the formation of austenite during the rolling deformation of the structural steel work, and the thickness of the shear deformed layer can be reduced.

Further, the rolling process of the present invention performs low-strength rolling on two mutually perpendicular and uniformly separated structural steel workpieces, the distance between the rolls being 80% to 80% of the structural steel workpiece size. It is between 90%. Therefore, carbon rolling that rolls between some crystals in the structural steel work can be discharged during rolling, which improves the mechanical strength and thermal strain performance of the work during subsequent machining, extends the service life, and is effective. It is possible to prevent deformation and cracking of the work.

Furthermore, in order to improve the performance of the structural steel, the metal powder of the present invention focuses on the selection of nano-powder such as iron, renium, titanium, tungsten, manganese, chromium, magnesium, and the metal key on the surface of the structural steel. Utilizing the function with the electrode, a new dense protective layer is formed on the rolled surface, and this protective layer is fused to the austenite or metamorphic layer surface formed on the surface of the structural steel work by the rolling step. Due to its fusion function, nano-level metal particles change the physical properties of austenite or metamorphic layers, greatly improve the hardness and brittleness of the work surface, reduce deformation and cracking, and facilitate processing.

Other features and advantages of the invention are described in subsequent instructions, which are partially apparent or understood by practicing the invention.

The accompanying drawings are used to further understand the present invention, form part of the description, and are used in the description of the present invention together with the examples of the present invention, but are not limited to the present invention.
FIG. 1 is a schematic view of the overall configuration of the pretreatment apparatus for shaped steel according to the present invention. FIG. 2 is a schematic view showing a connection relationship between an electrode connection cylinder and a contact piece in the pretreatment apparatus for mold steel of the present invention.

Preferred examples of the present invention will be described below with reference to the accompanying drawings, but the preferred examples described herein are used only to illustrate and illustrate the invention and are not intended to limit the invention. Please understand that there is no such thing.

In order to further clarify the purpose and technical solution of the examples of the present invention, the technical solutions of the examples of the present invention will be described clearly and completely together with the accompanying drawings of the examples of the present invention. Obviously, the examples described are part of, but not all, of the examples of the invention. All of the described embodiments based on the present invention and other examples obtained by those skilled in the art without creative effort are within the scope of the present invention.

Those skilled in the art will appreciate that all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the present invention belongs, unless otherwise defined. can. Terms such as those defined in common dictionaries should be understood to have meanings consistent with those in the context of prior art, and unless defined herein, ideally or overly formal. It should also be understood that it is not interpreted in any sense.

The meaning of "connection" described in the present invention may be a direct connection between parts or an indirect connection between parts via other parts.

The meaning of "upper, lower" described in this utility model is that when the user is facing the device, the upper part of the user is the upper part and the lower part of the user is the lower part.

The meaning of "front, back" described in the present invention is that when the user is facing the device, the front of the user is the front and the back of the user is the back.

FIG. 1 is a pretreatment apparatus for a shaped steel according to the present invention, including the following.

Heat treatment device 71: Used to heat-treat a mold steel work waiting to be processed to 250 ° C. to 350 ° C. and carry out the heat-treated mold steel work.

Roller conveyor 72: It is connected to the carry-out port of the heat treatment apparatus 71 and is used to move the heat-treated mold steel work to the cutting processing apparatus in the subsequent process. The roller conveyor 72 includes a roller 73, a bearing 74, and a frame 75, and ceramic heating elements are evenly arranged on the inner wall of the roller, one end of the roller 73 is one end of the bearing 74, and the other end of the bearing 74 is a motor. It is connected to and drives a roller to rotate in the frame 75. Among them, the roller so that the angle at which the liquid medium is ejected from the subsequent medium nozzle follows the moving direction of the mold steel work and the inclination angle with respect to the mold steel work is between 25 ° and 35 °. Since the inclination angle of the conveyor is set to be 10 ° to 20 ° higher than the horizontal plane, the sprayed area can be expanded as much as possible, the uniformity of the metal powder spraying can be improved, and the drive of the work can be secured.

As shown in FIG. 2, the other end of the roller 73 is connected to an electrode connecting cylinder 76 including metal electrode rings on both inner and outer sides, the inner metal electrode ring protrudes from the outer metal electrode ring, and the two metal electrode rings The first contact piece 81 and the second contact piece 82, which have stable electrical connections to the two electrodes of the MCH ceramic heating element, respectively, and which have stable electrical contact with the two metal electrode rings, are installed in the frame 75. The first contact piece and the second contact piece are separated by an insulating material, and the first contact piece and the second contact piece each pass two metal electrode rings to apply stable electric power to the two electrodes of the ceramic heating element. After being supplied and powered, the ceramic heating element uniformly provides a constant temperature in the range of at least 250 ° C to the outer wall of the roller, so that the heat-treated mold steel work is slowly annealed on the roller conveyor 72 to the range of 250 ° C. , Maintain at this temperature.

In order to ensure the effect of a constant temperature, a tank body is further provided below the roller conveyor, and the width of the tank body is smaller than the length of the roller and larger than the size of the mold steel work, and the tank body is The depth of the two-layer roller conveyor is higher than the height of the two-layer roller conveyor, and a through hole for passing the roller is provided on the side surface of the tank body, and is further discharged from the ceramic heating element inside the tank body. A reflective coating is applied to reflect heat and maintain the temperature of the mold steel workpiece.

Medium nozzle 77: Located above the roller conveyor 72, away from the heat treatment apparatus 71, used to spray the liquid medium onto the surface of the mold steel workpiece annealed to the first temperature range, the liquid medium An oil-based medium heated up to the first temperature range, in which metal powder is also mixed with the oil-based medium, and the metal powder can be nano-level iron powder, renium powder, titanium powder, tungsten powder, manganese powder, chromium powder, or magnesium powder. Includes one or a mixture thereof.

Roller 78: Includes alternating horizontal and vertical rolling mills installed at the rear end of the medium nozzle 77 with respect to the direction of movement of the structural steel workpiece, with spacing between rolls in the rolling mill. It is in 80% to 90% of the mold steel work size.

Therefore, by using the above device, the following pretreatment procedure can be realized, and the work surface strength at the time of processing can be ensured.

First, the mold steel work waiting to be processed is heat-treated to 250 ° C. to 350 ° C., and the heat-treated mold steel work is carried out.

Then, ceramic heating elements are installed on both the upper and lower sides of the mold steel work after being carried out, the temperature of the mold steel work is kept at 250 ° C. or higher at the temperature discharged from the ceramic heating element, and the mold steel work is kept at 30 ° C. per hour. Anneal slowly at an annealing speed that does not exceed.

Subsequently, a liquid medium is sprayed on the surface of the mold steel work before rolling, the liquid medium is an oil-based medium heated to 250 ° C., and metal powder is also mixed with the oil-based medium, and the metal powder is nano-level. Includes any one or a mixture of iron powder, renium powder, titanium powder, tungsten powder, manganese powder, chromium powder, magnesium powder and the like.

Finally, the structural steel work is subjected to horizontal rolling and vertical rolling, and the distance between each roll of the rolling mill during the rolling is between 80% and 90% of the size of the structural steel work. It has become. In the work thus pretreated, carbon rolling is deposited on the surface thereof, and nanopowder of iron, renium, titanium, tungsten, manganese, chromium, magnesium and the like interacts with the metal key electrode on the surface of the structural steel. A new dense protective layer is formed on the rolled surface, and this protective layer is fused to the austenite or metamorphic layer surface formed on the surface of the structural steel work by the rolling process. The physical properties of the austenite or metamorphic layer on the surface of the structural steel work after the pretreatment of the present invention are changed, the hardness and brittleness of the work surface are greatly improved, deformation and cracking are less likely to occur, and processing is facilitated. ..

In the present invention, the ceramic heating element provided in the roller transfer device keeps the structural steel work waiting to be machined within the first temperature range, whereby the crystal characteristics of the surface of the structural steel work do not change due to a sudden change in temperature. Can be guaranteed. Further, the present invention sprays a liquid medium containing nanometal powder through a medium nozzle to a place on the surface of the work where it is going to come into contact with a rolling mill. Therefore, while the structural steel of the present invention is being rolled, the medium can avoid the formation of austenite during the rolling deformation of the structural steel work, reduce the thickness of the shear deformation layer, and facilitate the subsequent processing. ..

Those skilled in the art should understand that the above are merely preferred embodiments of the present invention and do not limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will still modify the technical solutions described in the above embodiments, or equivalently provide some technical features. Can be replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the invention should be included in the scope of protection of the invention.

Claims (7)

A pretreatment apparatus for shaped steel, comprising a heat treatment apparatus (71), a roller conveyor (72), a medium nozzle (77), and a rolling mill (78).
The heat treatment apparatus (71) is used to heat-treat a mold steel work waiting to be processed to 250 ° C. to 350 ° C. and carry out the heat-treated mold steel work.
The roller conveyor (72) is connected to the carry-out port of the heat treatment apparatus (71) and is used to move the mold steel work after the heat treatment to the cutting processing apparatus in the subsequent step. A roller (73), a bearing (74), and a frame (75) are included, ceramic heating elements are evenly arranged on the inner wall of the roller, and one end of the roller (73) is attached to one end of the bearing (74). The other end of the bearing (74) is connected to a motor to drive the roller to rotate in the frame (75), and the other end of the roller (73) is an electrode connection tube (containing metal electrode rings on both inner and outer sides). 76), the inner metal electrode ring projects from the outer metal electrode ring, and the two metal electrode rings each make a stable electrical connection to the two electrodes of the ceramic heating element, and the frame (75). Inside, a first contact piece (81) and a second contact piece (82), which are in stable electrical contact with the two metal electrode rings, are installed, and between the first contact piece and the second contact piece, respectively. Is separated by an insulating material, and the first contact piece and the second contact piece each supply stable electric power to the two electrodes of the ceramic heating element through the two metal electrode rings, and after the power supply, the ceramic heat generating. In order for the body to uniformly provide a constant temperature in the first temperature range to the outer wall of the roller, the mold steel work after heat treatment is slowly annealed on the roller conveyor (72) to the first temperature range, and this temperature. To keep it
The medium nozzle (77) is arranged above the roller conveyor (72) and away from the heat treatment apparatus (71) on the surface of the mold steel work in which the liquid medium is annealed to the first temperature range. Used for spraying, the liquid medium is an oil-based medium heated to a first temperature range, the oil-based medium is also mixed with metal powder, and the metal powder is nano-level iron powder, renium powder, titanium powder, Containing any one or a mixture of tungsten powder, manganese powder, chromium powder, magnesium powder,
The rolling mill (78) is installed at the rear end of the medium nozzle (77) with respect to the moving direction of the shaped steel workpiece, and includes alternately arranged horizontal rolling mills and vertical rolling mills. A pretreatment apparatus for a mold steel, wherein the distance between rolls in the rolling mill is 80% to 90% of the work size of the mold steel. The pretreatment apparatus for a shaped steel according to claim 1, wherein the first temperature range reaches at least 250 ° C. The roller conveyor (72) is provided with an inclination angle of 10 ° to 20 ° from the horizontal plane, and the angle of the liquid medium sprayed from the medium nozzle (77) is the horizontal plane along the moving direction of the mold steel work. The pretreatment apparatus for mold steel according to claim 2, wherein the pretreatment device is directed downward by 15 ° with respect to the mold steel. The pretreatment apparatus for a shaped steel according to claim 2 or 3, wherein the ceramic heating element is an MCH ceramic heating element. A tank body (79) is further provided below the roller conveyor (72), and the width of the tank body (79) is smaller than the length of the roller (73) and larger than the size of the shaped steel workpiece. The depth of the tank body (79) is higher than the height of the two-layer roller conveyor, and a through hole for passing the roller (73) is provided on the side surface of the tank body (79). 7. The pretreatment device for the structural steel according to item 1. Step A1: A process of heat-treating a mold steel work waiting to be processed to 250 ° C. to 350 ° C. and carrying out the heat-treated mold steel work.
Step A2: Ceramic heating elements are installed on both the upper and lower sides of the mold steel work after being carried out, the temperature of the mold steel work is maintained at 250 ° C. or higher at the temperature discharged from the ceramic heating element, and the mold steel work is kept at 250 ° C. or higher per hour. A process of slowly annealing at an annealing rate that does not exceed 30 ° C.
Step A3: A liquid medium is sprayed on the surface of the structural steel work before rolling, and the liquid medium is an oil-based medium heated to 250 ° C., and the metal powder is also mixed with the oil-based medium, and the metal powder is nano-level. Steps involving any one or a mixture of iron powder, renium powder, titanium powder, tungsten powder, manganese powder, chromium powder, magnesium powder, and procedure A4: horizontal rolling and vertical direction on the structural steel workpiece. The rolling process of the above is performed, and the distance between the rolls of the rolling mill during the rolling process includes a step of being between 80% and 90% of the work size of the structural steel. Processing method. The sixth aspect of claim 6, wherein the angle of the liquid medium sprayed from the medium nozzle (77) is an inclination angle between 25 ° and 35 ° with respect to the moving direction of the mold steel work. Pretreatment method for shaped steel.

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