JP3234838U - Medium spray head for cutting mold steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the thickness of a modified layer on a cut surface, to secure the mechanical strength and thermal strain performance of the cut surface of a finished product after cutting, to improve the service life of the cut surface, and to improve the service life of the work. Provided is a medium spray head for cutting a mold steel which can effectively prevent deformation and cracking. SOLUTION: In a medium spray head for cutting a mold steel, a medium spray head 24 having a through hole 26 or a pore is arranged between a support column 21 of a cutting head and an electrode wire, and the medium spray head is cut through the medium spray head 24. A gas medium or a liquid medium is provided to a portion where the electrode wire is in contact with the mold steel work waiting to be machined in the state. The cutting head uses a medium during the wire discharge cutting process to reduce austenite formed during cutting. [Selection diagram] FIG. 4

Description

The utility model relates to the field of structural steel processing equipment, and particularly to a medium spray head for cutting structural steel.

Mold steel is often used in the production of cold punch dies, hot punch dies, and die casting dies, and its high hardness makes it difficult to process. During cutting, the cutting blade is easily broken, the cut surface is rough, and it is difficult to meet the demand for machining accuracy.

Due to the high hardness of the structural steel itself, the cutting blade acting on it may easily break or shift during cutting, and the cutting blade or the structural steel work waiting to be machined may be misaligned during cutting. Is likely to occur.

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.

During the production of the structural steel, the cut surface also needs to be cooled and lubricated during each demolding process, and during the production, the thermal fatigue performance of the structural steel workpiece is affected by the effects of such frequent rapid heating and quenching. Further lower. On the surface of the conventional mold steel work after cutting, a heat-affected layer is formed due to the effects of rapid heating and quenching during processing, the crystal structure is catabolized, a heat-modified layer is formed inside, and the stress strength of the work is increased. Affects and makes the workpiece after cutting deformed and easily cracked.

In order to solve the defects of the prior art, the utility model aims to provide a medium spray head for cutting a mold steel.

First, in order to achieve the above object, a medium spray head for cutting mold steel is proposed and fixed to the lower end of the support column of the cutting head. Among them, the support column has a hollow structure, and the medium spray head has the support column and the cutting head. A gas-liquid three-way valve is connected to the upper end of the strut to introduce the gas or liquid medium into the hollow structure, and the gas or liquid medium is hollow inside the strut. It flows to the medium spray head along the structure. The outer surface of the medium spray head is provided with a groove for accommodating the electrode wire, the depth of the groove does not exceed the diameter of the electrode wire, and a through hole or pore is formed on the inner wall or the outer side of the groove. Also provided, the through holes or pores are at least partially in contact with a gas or liquid medium housed in a hollow structure inside the column. In the cut state, while the electrode wire is moving with respect to the work of the mold steel waiting to be machined, the through hole or pore is a gas medium or a liquid medium in the hollow structure, and the surface of the electrode wire is the mold steel waiting to be machined. Guide to the part that comes into contact with the work. Alternatively, the through holes or pores guide a gas or liquid medium in the hollow structure and coat the surface of the electrode wire. Among them, the gas medium contains an inert gas, a sulfur-removing gas, a carbon-removing gas or a mixture thereof, the liquid medium is deionized water or an oil-based medium, and a metal powder is further mixed with the liquid medium. The metal powder contains any one of iron, renium, titanium, tungsten, manganese, chromium, and magnesium, or a mixture thereof.

As an option, in the medium spray head for cutting mold steel, the medium spray head in the medium spray head has a roulette-shaped structure, the axle of which protrudes and is connected to the lower end of the support column, and the roulette-shaped structure is the connection. Rotate around the radial direction of the piece. A groove for accommodating the electrode wire is provided in the circumferential direction of the roulette structure, and the direction of the groove is the same as the rotation direction of the medium spray head.

As an option, in the medium spray head for cutting mold steel, the medium spray head is a sphere or a flat sphere, and a connection piece is provided in the minor axis direction thereof, and the connection piece is connected to the lower end of the support column. , The major axis of the sphere and the flat sphere rotates about the radial direction of the connection piece. A groove for accommodating the electrode wire is provided on the surface of the medium spray head perpendicular to the circumferential direction of the connection piece, and the direction of the groove is the same as the rotation direction of the medium spray head.

Optionally, in the structural steel cutting medium spray head, the through holes or pores are arranged along the rotational direction of the sphere, flat sphere, or roulette shape.

As an option, in the medium spray head for cutting mold steel, the lower surface of the medium spray head has a flat structure, and different grooves are alternately arranged in the flat structure. The depth of each groove is different, and the difference in the depth of each groove is at least the diameter of the electrode wire.

As an option, in the medium spray head for cutting the mold steel, the thickness of the lower surface of the medium spray head is increased at the position where the grooves intersect.

As an option, in the medium spray head for cutting mold steel, the grooves are alternately arranged in a "rice" shape, and the thickness of the lower surface of the medium spray head decreases from the center to the edges. ..

The gas medium ejected by the medium spray head comprises nitrogen, oxygen or a mixture thereof. Alternatively, the gas medium is compressed air.

As an option, in the medium spray head for cutting mold steel, the liquid powder ejected from the medium spray head contains a nano-level metal powder having a diameter of 50 nm or less, and the liquid medium is the nano powder. It is a mixed suspension.

In the present practical novel, a medium spray head having through holes or pores is arranged between the support of the cutting head and the electrode wire, and the electrode wire is waiting to be processed in a cut state through the medium spray head. A gas medium or a liquid medium is provided to the portion in contact with the mold steel work. Therefore, the utility model cutting head can use a medium during wire discharge cutting to reduce austenite formed during cutting and reduce the thickness of the metamorphic layer on the cut surface. Furthermore, in this utility model, the mechanical strength and thermal strain performance of the cut surface of the finished product after cutting can be ensured by the above process, the service life of the cut surface is improved, and deformation and cracking of the work are effectively prevented. can.

Further, according to the special medium spray head structure of the present practical novel, the groove for accommodating the electrode wire is provided with through holes or pores for providing the liquid medium or the gas medium to the outside, and the gas medium or the liquid medium is provided. When the gas passes through the through hole, pressure is applied to the electrode wire in the direction of the work, and the pressure forcibly maintains the contact strength between the electrode wire and the work or the distance between the two in a relatively stable range. , Reduces tremor due to the effects of electrostatic force and blasting force during cutting. Therefore, the cut surface of the utility model becomes smoother, and the processing cost of the post-process can be saved.

Further, in the present utility model, a plurality of electrode wires may intersect the surface of the medium spray head structure through grooves having different depths. Therefore, the alternating arrangement of the electrode wires allows the charges between the electrode wires to be superposed, and the relative movement between the electrode wires can increase the electric field strength. When it acts on the mold steel work and cuts, the effect of several times the superposition effect of the electrode wires of each group can be obtained. According to the present invention, the cutting efficiency can be significantly improved by alternately superimposing the electrode wires while ensuring the cutting effect.

Other features and advantages of the Utility Model will be described in subsequent instructions, which will be partially revealed or understood by practicing the present invention.

The attached drawings are used to further understand the Utility Model, form part of the description, and are used to explain the Utility Model along with examples of the Utility Model, but limit the Utility Model. is not it. In the attached figure:
FIG. 1 is a schematic view of the overall configuration of a cutting head in the cutting machine according to the utility model. FIG. 2 is a schematic structural diagram of a medium spray head having a roulette structure in the present utility model. FIG. 3 is a schematic structural diagram of a medium spray head having an oblate spheroidal structure in the present utility model. FIG. 4 is a schematic structural diagram of a medium spray head having a “rice” -shaped groove in this utility model.

Preferred examples of the utility model will be described below with reference to the accompanying drawings, but the preferred examples described herein are used only to illustrate and explain the utility model and limit the utility model. Please understand that it is not something to do.

Cutting equipment for shaped steel typically includes:

Cutting table 1: A mold steel work waiting to be machined is installed on the upper surface thereof, and the mold steel work waiting to be machined is fixed to the cutting table, or the work moves with respect to the cutting device 2 on the surface thereof. Used for

Cutting device 2: The wire feeding mechanism includes a wire feeding mechanism and an electrode wire, and the wire feeding mechanism includes a plurality of axles, and the axles drive the electrode wires to reciprocate or move in one direction, whereby a cutting tool portion is provided. The electrode wire of No. 1 is moved with respect to the mold steel work waiting to be machined. In the cut state, electricity flows through the electrode wire, which is discharged between the electrode wire and the mold steel work waiting to be machined, and electrostatic force and explosive force are generated to bring the surface of the mold steel work waiting to be machined to the electrode wire. It erodes the parts that are in contact.

Protective device 4: It is wrapped around the outside of the cutting device 2 in order to avoid scattering of sparks or metal debris generated during cutting. A gas or liquid supply pipe can also be connected inside the protective device, which sprays liquid onto the work surface at the cutting position to keep the temperature stable during cutting. The gas supply pipe emits a specific gas to the work surface at the cutting position to ensure the cutting effect.

See Figure 1. In the utility model, the support column 21 for fixing the cutting head is provided as a hollow structure, and the medium spray head 24 is connected to the lower end thereof. The medium spray head 24 is arranged between the column and the electrode wire, and a gas-liquid three-way valve 25 is connected to the upper end of the column 21 to introduce a gas medium or a liquid medium into the hollow structure. The medium or liquid medium flows to the medium spray head 24 along the hollow structure inside the column 21. A groove for accommodating the electrode wire 23 is provided on the outer surface of the medium spray head 24, the depth of the groove does not exceed the diameter of the electrode wire 23, and a through hole is formed on the inner wall or the outer side of the groove. 26 or pores are also provided, and the through holes 26 or pores are at least partially in contact with a gas or liquid medium housed in a hollow structure inside the column 21. In the cut state, while the electrode wire 23 is moving with respect to the structural steel work waiting to be machined, the through hole 26 or the pores wait for the gas medium or liquid medium in the hollow structure, and the surface of the electrode wire 23 waits for the machining. Lead to the part that comes into contact with the mold steel work. Alternatively, the through holes 26 or pores guide a gas or liquid medium in the hollow structure and coat the surface of the electrode wire 23.

In the implementation state shown in FIG. 2 or 3, the medium spray head 24 has a sphere, flat sphere, or roulette-shaped structure, and a connection piece 27 is provided in the radial direction thereof, and the connection piece is attached to the lower end of the support column 21. The connected sphere, flat sphere or roulette-shaped structure rotates about the radial direction of the connecting piece 27. A groove for accommodating the electrode wire 23 is provided on the surface of the medium spray head 24 perpendicular to the circumferential direction of the connection piece 27, and the direction of the groove is the same as the rotation direction of the medium spray head. The through holes 26 or pores are arranged along the direction of rotation of the sphere, oblate spheroid, or roulette shape.

See the structure of the medium spray head shown in Figure 4. Its lower surface has a flat structure, and different grooves are alternately arranged in the flat structure. The depth of each groove is different, and the difference in the depth of each groove is at least the diameter of the electrode wire 23. , The grooves are alternately arranged in a "rice" shape, and the thickness of the lower surface of the medium spray head 24 increases at the position where the grooves intersect. Therefore, at the time of cutting, the electric charges between the electrode wires are superposed by the alternating arrangement of the electrode wires, and the electric field strength can be increased by the relative movement between the electrode wires. When it acts on the mold steel work and cuts, the effect of several times the superposition effect of the electrode wires of each group can be obtained. According to the present invention, the cutting efficiency can be significantly improved by alternately superimposing the electrode wires while ensuring the cutting effect.

In this utility model, after the pretreatment of the mold steel work waiting to be machined, the electric spark cutting process can be performed under a special medium via the above-mentioned cutting head. During disconnection:

The electrode wire 23 is driven to move with respect to the mold steel work waiting to be machined, and in the cut state, an electric discharge is generated between the electrode wire and the mold steel work waiting to be machined, and the surface of the mold steel work waiting to be machined. And erodes the contact portion with the electrode wire.

In the first to second cutting processes, a gas medium is simultaneously supplied to the contact portion between the surface of the electrode wire 23 and the mold steel work waiting to be processed, and nitrogen, oxygen, compressed air or them are supplied to the gas medium. Contains a mixture of.

From the third cutting to the final cutting, a liquid medium is simultaneously supplied to the contact portion between the surface of the electrode wire 23 and the mold steel work waiting to be machined, and the liquid medium is deionized water or an oil-based medium. A metal powder having a diameter of less than 50 nanometers is also mixed in the liquid medium, and the metal powder contains any one of iron, renium, titanium, tungsten, manganese, chromium, and magnesium or a mixture thereof.

Therefore, when this practical proposal applies electrostatic force and rupture force to the mold steel on the work surface under the action of cutting electric sparks to locally melt it, it oxidizes the sulfide and carbon impurities dissolved by the introduced oxygen. , The metal can be protected by nitrogen or an inert gas so as not to be affected by it. In the process of further cutting, the medium spray head introduces the liquid medium containing the nanometal directly to the cutting point, so that the nanopowder interacts with the electrode wire and crystallizes during restoration of the rigidity of the molten metal on the cut surface. It is embedded between them to form a new dense protective layer on the cut surface. This protective layer is polarized by the above metal powder after electromagnetic excitation and fused to the surface of the austenite or metamorphic layer formed by the cutting action, and the melting action forms nano-level metal particles by the austenite or the metamorphic layer. By changing the physical properties of the remelted layer, the hardness and brittleness of the cut surface are greatly improved, and deformation and cracking are less likely to occur.

To further ensure that the melting step between the metals is not disturbed by the external environment, the melting step must be carried out in a sealed state of deionized water or an oily medium to stabilize the melting point temperature during the step. There is a need. In order to achieve this object, the utility model is also provided with a temperature sensor at a portion where the surface of the guide wheel of the wire feeding mechanism 22 contacts the electrode wire 23. The electrode wire 23 is bypassed by the guide wheel, and the temperature sensor of the guide wheel can detect the temperature of the electrode wire 23 and determine the melting point temperature state from the temperature of the electrode wire. When the temperature of the electrode wire 23 exceeds the set value, the opening degree of the gas-liquid three-way valve 25 increases, the flow rate of the gas medium or liquid medium drawn from the through hole 26 or the pores increases, and excess heat is generated. Get rid of.

After the calculation experiment, the temperature when the electrode wire at the cutting point arrives at the position of the guide wheel by the auxiliary cooling of the liquid or gas medium is usually between 240 and 300 ° C., and the corresponding melting point temperature is the above-mentioned remelting layer. Suitable for stable molding of structure and maintenance of appropriate rigidity. By setting the set value of the electrode wire temperature determined by the sensor to 300 ° C., the cut surface having the best performance can be obtained, and if the temperature rises further, the performance deteriorates and there is no obvious merit anymore.

The processing process also depends on the pretreatment of the work. As the procedure, Step 1: The mold steel work waiting to be machined is heat-treated to a critical temperature or higher. Step 2: The mold steel work after heat treatment is slowly annealed to 250 ° C., and the annealing rate does not exceed 30 ° C. per hour. Slow annealing can keep the overall performance of the workpiece stable and further prevent cracking and deformation during cutting. The reason is that before cutting, the cooling and heating rates from the work surface to the center are inconsistent, and the temperature difference causes non-uniform expansion in the mechanism, resulting in non-uniform internal stress. During processing, the temperature difference between the cutting point and the inside of the metal becomes large, the non-uniform stress is further applied, the tensile stress near the cutting point becomes large, and the cut surface is broken. Slow annealing tends to keep the temperature of the inner and outer surfaces of the metal constant, so that the stress can be effectively reduced and the cutting effect can be improved.

Those skilled in the art should understand that the above is merely a preferred embodiment of the Utility Model and does not limit the Utility Model. Although the utility model 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 embodiments, or equivalently some technical features. Can be replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the Utility Model should be included in the scope of protection of the Utility Model.

Claims (7)

It is fixed to the lower end of the support column (21) of the cutting head, in which the support column (21) has a hollow structure, and the medium spray head (24) is arranged between the support column and the electrode wire of the cutting head, and is a gas medium or In order to introduce the liquid medium into the hollow structure, a gas-liquid three-way valve (25) is connected to the upper end of the support column (21), and the gas medium or liquid medium is along the hollow structure inside the support column (21). Flows to the medium spray head (24).
A groove for accommodating the electrode wire (23) is provided on the outer surface of the medium spray head (24), the depth of the groove does not exceed the diameter of the electrode wire (23), and the inner wall of the groove is provided. Alternatively, a through hole (26) or a pore is also provided on the outside, and the through hole (26) or the pore is at least partially accommodated in a hollow structure inside the support column (21) with a gas medium or a liquid medium. Contact,
In the cut state, while the electrode wire (23) is moving with respect to the structural steel work waiting to be machined, the through hole (26) or the pores cause the gas medium or liquid medium in the hollow structure to move through the electrode wire (23). Guides the surface of the A medium spray head for cutting mold steel, which is characterized by covering a surface. The medium spray head (24) has a roulette-shaped structure, the axle of which protrudes and is connected to the lower end of the support column (21), and the roulette-shaped structure is centered in the radial direction of the connecting piece (27). Rotate to
Claim 1 is characterized in that a groove for accommodating the electrode wire (23) is provided in the circumferential direction of the roulette structure, and the direction of the groove is the same as the rotation direction of the medium spray head (24). Mold steel cutting medium spray head described in. The medium spray head (24) is a sphere or a flat sphere, and a connection piece (27) is provided in the minor axis direction thereof. The connection piece is connected to the lower end of the support column (21) to form the sphere or the flat sphere. The major axis rotates about the radial direction of the connecting piece (27).
A groove for accommodating the electrode wire (23) is provided on the surface of the medium spray head (24) perpendicular to the circumferential direction of the connection piece (27), and the direction of the groove is the direction of the medium spray head (24). The medium spray head for cutting a mold steel according to claim 1, wherein the spray head has the same direction of rotation. The medium spray head for cutting a mold steel according to claim 2 or 3, wherein the through holes (26) or pores are arranged along the rotation direction of the medium spray head. The lower surface of the medium spray head (24) has a flat structure, and different grooves are alternately arranged in the flat structure. The medium spray head for cutting a mold steel according to claim 2 or 3, wherein the depth of each groove is different, and the difference in depth of each groove is at least the diameter of the electrode wire (23). .. The medium spray head for cutting a mold steel according to any one of claims 1 to 5, wherein the thickness of the lower surface of the medium spray head (24) increases at a position where the grooves intersect. One of claims 1 to 6, wherein the grooves are alternately arranged in a "rice" shape, and the thickness of the lower surface of the medium spray head (24) decreases from the center to the edges. The medium spray head for cutting mold steel described in item 1.

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