CN210121714U - Medium sprayer for cutting die steel - Google Patents
Medium sprayer for cutting die steel Download PDFInfo
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- CN210121714U CN210121714U CN201822236812.2U CN201822236812U CN210121714U CN 210121714 U CN210121714 U CN 210121714U CN 201822236812 U CN201822236812 U CN 201822236812U CN 210121714 U CN210121714 U CN 210121714U
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- die steel
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Abstract
A medium spray head for die steel cutting. The utility model discloses set up the medium shower nozzle that has through-hole or hole between the support column of cutting head and wire electrode, do under cutting state through this medium shower nozzle the wire electrode provides gaseous medium or liquid medium with the position that the mould steel work piece of treating processing contacted. From this, set up the utility model discloses the cutting head of medium shower nozzle is carrying out spark-erosion wire cutting's in-process, and usable medium reduces the austenite that forms in the cutting process, reduces cutting plane metamorphic layer thickness. Furthermore, the utility model discloses a mechanical strength and the thermal strain performance of cutting back finished product cutting plane can be guaranteed to foretell technology, improve cutting plane life, effectively prevent work piece deformation, fracture, improve cutting accuracy.
Description
Technical Field
The utility model relates to a mould steel processing equipment field especially relates to a medium shower nozzle for mould steel cutting.
Background
Die steels are commonly used to make cold, hot or pressure die castings which have a high hardness and are therefore not easily machinable. In the cutting process, the cutter is easy to break, the cutting surface is rough, and the requirement of processing precision is difficult to meet.
Because the die steel is high in hardness, a cutting knife acted on the die steel is easy to break or slip and deviate in the cutting process, and the position deviation is easy to generate between the cutting knife or a die steel workpiece to be cut in the cutting process.
In order to facilitate cutting, the prior art often adopts a heat treatment mode to reduce the processing difficulty of die steel. However, the die steel has thermal fatigue characteristics, and the heat treatment, especially the heat treatment quenching temperature, in the processing process can affect the austenite grain size of the cutting surface of the die steel, the solid solubility of alloy elements and the tissue uniformity of the workpiece surface, thereby affecting the overall thermal fatigue performance of the die steel workpiece finished product.
In the service process of the die steel, the cutting surface of the die steel needs to be subjected to cooling and lubricating treatment in each demoulding process, and the thermal fatigue performance of the die steel workpiece can be further deteriorated by the frequent sudden hot quenching effect in the service process. The surface of the cut steel workpiece of the existing die forms a heat influence layer due to the influence of sharp heat and sharp cooling in the machining process, the crystalline structure of the heat influence layer is differentiated, a heat altered layer is formed inwards, the stress intensity of the workpiece is influenced, and the cut workpiece is easy to deform and crack.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects existing in the prior art, the utility model aims to provide a medium nozzle for cutting die steel.
Firstly, in order to achieve the above purpose, a medium nozzle for cutting die steel is provided, the medium nozzle is fixed at the lower end of a support column of a cutting head, wherein the support column is of a hollow structure, the medium nozzle is arranged between the support column and an electrode wire of the cutting head, the upper end of the support column is connected with a gas-liquid three-way valve for introducing a gas medium or a liquid medium into the hollow structure, and the gas medium or the liquid medium flows to the medium nozzle along the hollow structure inside the support column; 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, the inner wall or the outer side of the groove is also provided with a through hole or a pore, and the through hole or the pore is at least partially contacted with a gas medium or a liquid medium accommodated in a hollow structure in the support column; in a cutting state, the through hole or the pore leads out a gas medium or a liquid medium in the hollow structure to a part where the surface of the electrode wire is contacted with the die steel workpiece to be processed in the process that the electrode wire moves relative to the die steel workpiece to be processed; or the through holes or the pores lead out the gas medium or the liquid medium in the hollow structure and cover the surface of the electrode wire. Wherein the gaseous medium comprises an inert gas, a sulfur-removing gas, a carbon-removing gas, or a mixture thereof; the liquid medium is deionized water or an oily medium, and metal powder is also mixed in the liquid medium and comprises any one or mixture of iron, rhenium, titanium, tungsten, manganese, chromium and magnesium.
Optionally, the medium nozzle for die steel cutting is of a wheel disc-shaped structure, a wheel shaft of the medium nozzle protrudes and is connected with the lower end of the supporting column, and the wheel disc-shaped structure rotates around the radial direction of the connecting piece; the groove for accommodating the electrode wire is arranged in the circumferential direction of the wheel disc structure, and the direction of the groove is the same as the rotating direction of the medium spray head.
Optionally, the medium nozzle for cutting the die steel is a sphere or an oblate sphere, a connecting piece is arranged in the short diameter direction of the medium nozzle, the connecting piece is connected with the lower end of the supporting column, and the long diameter of the sphere or the oblate sphere rotates around the radial direction of the connecting piece; the groove for accommodating the electrode wire is arranged on the surface of the medium spray head in a direction perpendicular to the circumferential direction of the connecting piece, and the direction of the groove is the same as the rotating direction of the medium spray head.
Optionally, the medium nozzle for die steel cutting is arranged in a manner that the through holes or the pores are arranged along a rotation direction of the sphere, the oblate sphere or the wheel disk.
Optionally, the medium nozzle for cutting the die steel is characterized in that the lower surface of the medium nozzle is a flat structure, and different grooves are formed in the flat structure in a staggered manner; the depth of each groove is different, and the difference of the depth of each groove is at least the diameter of the electrode wire.
Optionally, the thickness of the lower surface of the medium nozzle at the position where the grooves are staggered is increased.
Optionally, the medium nozzle for die steel cutting is provided, wherein the grooves are staggered into a shape like a Chinese character 'mi', and the thickness of the lower surface of the medium nozzle decreases from the middle to the edge.
The gaseous medium sprayed by the medium spray head comprises nitrogen, oxygen or a mixture thereof. Alternatively, the gaseous medium is compressed air.
Optionally, the medium nozzle for die steel cutting described above, wherein the liquid powder ejected by the medium nozzle contains nano-level metal powder, the diameter of the metal powder is not more than 50nm, and the liquid medium is a suspension liquid mixed with the nano-powder.
Advantageous effects
The utility model discloses a set up the medium shower nozzle that has through-hole or hole between the support column of cutting head and wire electrode, do under cutting state through this medium shower nozzle the wire electrode provides gaseous medium or liquid medium with the position that the mould steel work piece of treating processing contacted. Therefore, the utility model discloses a cutting head is carrying out spark-erosion wire cutting's in-process, and usable medium reduces the austenite that forms in the cutting process, reduces cutting plane metamorphic layer thickness. Furthermore, the utility model discloses a mechanical strength and the thermal strain performance of cutting back finished product cutting plane can be guaranteed to foretell technology, improve cutting plane life, effectively prevent work piece deformation, fracture.
In addition, because the utility model discloses special medium shower nozzle structure, its set up in the recess that holds the wire electrode and outwards provide liquid medium or gaseous medium's through-hole or hole, gaseous medium or liquid medium exert the pressure to the work piece through the in-process of this through-hole to the wire electrode, and pressure forces the contact strength between wire electrode and the work piece or makes the distance between the two maintain in the relatively stable within range, and reduces its effect of receiving cutting in-process electrostatic force and blast force and tremble. Therefore, the utility model discloses the surface after the cutting is more smooth level and smooth, can practice thrift the processing cost for follow-up technology.
Furthermore, in the utility model discloses in, the surface of medium shower nozzle structure still can supply crisscross the bypassing of multiunit wire electrode through the recess of the different degree of depth. Therefore, the electric charges between the electrode wires are superposed through the staggering of the electrode wires, and the electric field intensity of the electrode wires is increased due to the relative movement between the electrode wires. When the cutting tool is used for cutting a die steel workpiece, the effect which is several times of the effect of the superposition of each group of electrode wires can be achieved. The invention can ensure the cutting effect and greatly improve the cutting efficiency through the staggered and superposed action of the electrode wires.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the invention for the purpose of explanation and not limitation of the invention. In the drawings:
fig. 1 is a schematic view of the overall structure of a cutting head in a cutting and processing apparatus according to the present invention;
fig. 2 is a schematic structural view of a medium nozzle with a wheel disc structure according to the present invention;
FIG. 3 is a schematic structural view of a medium nozzle with an oblate spheroid structure according to the present invention;
fig. 4 is a schematic structural view of the medium nozzle of the "m" shaped groove of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The cutting processing apparatus for die steel generally includes:
the cutting platform 1 is provided with a die steel workpiece to be processed, and is used for fixing the die steel workpiece to be processed or enabling the workpiece to move on the surface relative to the cutting device 2;
the cutting device 2 comprises a wire feeding mechanism and a wire electrode, wherein the wire feeding mechanism comprises a plurality of wheel shafts, and the wheel shafts drive the wire electrode to reciprocate or move in a single direction, so that the wire electrode at the position of the cutting tool head moves relative to the die steel workpiece to be processed. In a cutting state, the electrode wire is charged, electric discharge is generated between the electrode wire and a die steel workpiece to be machined, and electrostatic force and explosive force are generated to erode the contact part of the surface of the die steel workpiece to be machined and the electrode wire;
and the protection device 4 is coated outside the cutting device 2 and used for preventing electric sparks or metal scraps from splashing in the cutting process. The inside of the protection device can be also connected with an air supply or liquid supply pipeline, and the liquid supply pipeline sprays liquid to the surface of the workpiece at the cutting part to keep the temperature of the workpiece stable in the cutting process. The gas supply pipeline outputs specific gas to the surface of the workpiece at the cutting part so as to ensure the cutting effect.
Referring to fig. 1, the support column 21 of the cutting head of the present invention is hollow, and the lower end of the support column is connected to a medium nozzle 24. The medium spray head 24 is arranged between the support column and the electrode wire, a gas-liquid three-way valve 25 is connected to the upper end of the support column 21 and used for introducing a gas medium or a liquid medium into the hollow structure, and the gas medium or the liquid medium flows to the medium spray head 24 along the hollow structure inside the support column 21. The outer surface of the medium spray head 24 is provided with a groove for accommodating the electrode wire 23, the depth of the groove does not exceed the diameter of the electrode wire 23, the inner wall or the outer side of the groove is also provided with a through hole 26 or a pore, and the through hole 26 or the pore is at least partially contacted with a gas medium or a liquid medium accommodated in a hollow structure in the supporting column 21; in a cutting state, in the process that the electrode wire 23 moves relative to a die steel workpiece to be processed, the through hole 26 or the pore space leads out a gas medium or a liquid medium in the hollow structure to a part where the surface of the electrode wire 23 is in contact with the die steel workpiece to be processed; or the through holes 26 or the pores lead out the gas medium or the liquid medium in the hollow structure and cover the surface of the electrode wire 23.
In the implementation shown in fig. 2 or fig. 3, the medium nozzle 24 is a sphere, an oblate sphere, or a wheel disc-shaped structure, and a connecting member 27 is arranged in the diameter direction of the medium nozzle, the connecting member is connected with the lower end of the supporting column 21, and the sphere, the oblate sphere, or the wheel disc-shaped structure rotates around the radial direction of the connecting member 27; a groove for accommodating the electrode wire 23 is arranged on the surface of the medium spray head 24 in the circumferential direction perpendicular to the connecting piece 27, and the direction of the groove is the same as the rotating direction of the medium spray head 24; the through holes 26 or apertures are arranged along the rotation direction of the sphere, oblate sphere or wheel disk.
Reference is made to the media ejection head structure shown in fig. 4. The lower surface of the flat structure is a flat structure, and different grooves are arranged on the flat structure in a staggered manner; the depth of each groove is different, and the difference of the depths of the grooves is at least the diameter of the electrode wire 23. The grooves are staggered in a shape like a Chinese character 'mi', and the thickness of the lower surface of the medium spray head 24 is increased at the staggered positions of the grooves. Therefore, when cutting, the electrode wires can be staggered, so that electric charges between the electrode wires are superposed, and the electric field intensity of the electrode wires is increased due to relative movement between the electrode wires. When the cutting tool is used for cutting a die steel workpiece, the effect which is several times of the effect of the superposition of each group of electrode wires can be achieved. The invention can ensure the cutting effect and greatly improve the cutting efficiency through the staggered and superposed action of the electrode wires.
Through foretell cutting head, the utility model discloses can be after treating the mould steel work piece preliminary treatment of processing, carry out the electric spark cutting under the special medium to it. In the cutting process:
driving the electrode wire 23 to move relative to the die steel workpiece to be processed, and discharging between the electrode wire and the die steel workpiece to be processed in a cutting state to erode a part of the surface of the die steel workpiece to be processed, which is in contact with the electrode wire;
synchronously supplying a gas medium to the contact part of the surface of the electrode wire 23 and the die steel workpiece to be processed during 1 st to 2 nd cutting; the gas medium comprises nitrogen, oxygen, compressed air or a mixture thereof;
synchronously providing a liquid medium to the contact part of the surface of the electrode wire 23 and the die steel workpiece to be processed when the 3 rd cutting is carried out until the final sequential cutting is carried out; the liquid medium is deionized water or an oily medium, metal powder with the diameter within 50 nanometers is mixed in the liquid medium, and the metal powder comprises any one or the mixture of iron, rhenium, titanium, tungsten, manganese, chromium and magnesium.
Therefore, the utility model discloses under the electric spark effect of cutting, when exerting electrostatic force and explosive force to workpiece surface die steel and make its local melting, can oxidize the sulphide and the carbon impurity of dissolving out through leading-in oxygen, protect metal not influenced through nitrogen gas or inert gas. In the process of further cutting, because the liquid medium containing the nano metal is directly introduced into the cutting point by the medium spray head, the nano powder and the charge of the electrode wire are acted, and the nano powder is embedded between crystals in the process of restoring the rigidity of the molten metal on the cutting surface, so that a new compact protective layer is formed on the cutting surface. The protective layer is formed by fusing the metal powder into the surface of an austenite or altered layer formed by cutting action after the metal powder is polarized by electromagnetic excitation, and the physical properties of a remelted layer formed by the austenite or altered layer are changed by the fusion action of the nano-scale metal particles, so that the hardness and brittleness of a cutting surface are greatly improved, and the cutting surface is not easy to deform and crack.
In order to further ensure that the fusion process among the metals is not interfered by the external environment, the fusion process needs to be carried out in a closed state of deionized water or an oily medium, and the temperature of a melting point needs to be ensured to be stable in the process. In order to achieve the purpose, the utility model discloses still be in the guide pulley surface of walking mechanism 22 with the position of wire electrode 23 contact is equipped with temperature sensor. The electrode wire 23 is wound around the guide wheel, the temperature sensor on the guide wheel can detect the temperature of the electrode wire 23, and the temperature condition of the melting point is judged according to the temperature of the electrode wire. When the temperature of the wire electrode 23 exceeds a preset value, the opening degree of the gas-liquid three-way valve 25 is enlarged, and the flow rate of the gas medium or the liquid medium led out from the through hole 26 or the pore is increased to take away the redundant heat.
Through calculation experiments, the temperature of the electrode wire at the cutting point reaching the position of the guide wheel after being subjected to auxiliary cooling by the liquid or gas medium is generally 240-300 ℃, and the corresponding melting point temperature is more suitable for stable forming of the remelted layer structure and appropriate rigidity maintenance. The preset value of the temperature of the electrode wire judged by the sensor is set to 300 ℃, a cutting surface with the optimal performance can be obtained, the temperature rises again, the performance is degenerated, and obvious advantages are not provided.
The above-described process also relies on pre-processing the workpiece. The method comprises the following steps: firstly, heat-treating a die steel workpiece to be processed to a critical temperature or above; and step two, slowly annealing the heat-treated die steel workpiece to 250 ℃, wherein the annealing speed is not more than 30 ℃ per hour. The slow annealing can keep the overall performance of the workpiece stable, and further prevent the cracking and deformation in the cutting process. The reason for this is that the cooling and heating rates are not uniform from the surface to the center of the workpiece before cutting, and the temperature difference causes non-uniform expansion in the mechanism thereof, resulting in imbalance of internal stress. In the processing process, the temperature difference between the cutting point and the metal is intensified, and the unbalanced stress further acts, so that the tensile stress near the cutting point is intensified, and the cutting surface is broken. And the slow annealing can keep the temperature of the inner and outer surfaces of the metal to be consistent, thereby effectively reducing the stress effect and improving the cutting effect.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A medium nozzle for die steel cutting is characterized in that the lower end of a supporting column (21) fixed on a cutting head is provided with a hollow structure, the medium nozzle (24) is arranged between electrode wires of the supporting column and the cutting head, the upper end of the supporting column (21) is connected with a gas-liquid three-way valve (25) for introducing a gas medium or a liquid medium into the hollow structure, and the gas medium or the liquid medium flows to the medium nozzle (24) along the hollow structure inside the supporting column (21); the outer surface of the medium spray head (24) is provided with a groove for accommodating the electrode wire (23), the depth of the groove does not exceed the diameter of the electrode wire (23), the inner wall or the outer side of the groove is also provided with a through hole (26) or a pore, and the through hole (26) or the pore is at least partially contacted with a gas medium or a liquid medium accommodated in a hollow structure in the supporting column (21);
in a cutting state, in the process that the electrode wire (23) moves relative to a die steel workpiece to be processed, the through hole (26) or the pore space leads out a gas medium or a liquid medium in the hollow structure to a part where the surface of the electrode wire (23) is in contact with the die steel workpiece to be processed; or
The through holes (26) or the pores lead out the gas medium or the liquid medium in the hollow structure and cover the surface of the electrode wire (23).
2. The media spray head for die steel cutting as in claim 1, wherein the media spray head is configured to spray media onto the die steel
The medium spray head (24) is of a wheel disc-shaped structure, the wheel shaft of the medium spray head is protruded and is connected with the lower end of the supporting column (21), and the wheel disc-shaped structure rotates around the radial direction of the connecting piece (27);
the groove for accommodating the electrode wire (23) is arranged in the circumferential direction of the wheel disc structure, and the direction of the groove is the same as the rotating direction of the medium spray head (24).
3. The medium spray head for die steel cutting according to claim 1, wherein the medium spray head (24) is a sphere or an oblate sphere, a connecting piece (27) is arranged in the short diameter direction of the sphere or the oblate sphere, the connecting piece is connected with the lower end of the supporting column (21), and the long diameter of the sphere or the oblate sphere rotates around the radial direction of the connecting piece (27);
the groove for accommodating the electrode wire (23) is arranged on the circumferential direction of the surface of the medium spray head (24) perpendicular to the connecting piece (27), and the direction of the groove is the same as the rotating direction of the medium spray head (24).
4. The media spray head for die steel cutting according to claim 3 or 2, wherein the through holes (26) or apertures are arranged in the direction of rotation of the media spray head.
5. The medium spray head for die steel cutting according to claim 1, wherein the lower surface of the medium spray head (24) is a flat structure, and different grooves are alternately arranged on the flat structure; the depths of the grooves are different, and the difference of the depths of the grooves is at least the diameter of the electrode wire (23).
6. The media spray head for die steel cutting according to claim 5, wherein the thickness of the lower surface of the media spray head (24) is increased at the position where the grooves are staggered.
7. The medium spray head for die steel cutting according to claim 5, wherein the grooves are staggered in a shape like a Chinese character 'mi', and the thickness of the lower surface of the medium spray head (24) is reduced from the middle to the edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236812.2U CN210121714U (en) | 2018-12-28 | 2018-12-28 | Medium sprayer for cutting die steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822236812.2U CN210121714U (en) | 2018-12-28 | 2018-12-28 | Medium sprayer for cutting die steel |
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| CN210121714U true CN210121714U (en) | 2020-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822236812.2U Active CN210121714U (en) | 2018-12-28 | 2018-12-28 | Medium sprayer for cutting die steel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465512A (en) * | 2018-12-28 | 2019-03-15 | 太仓新思成模具钢有限公司 | A kind of medium spray head for mould steel cutting |
-
2018
- 2018-12-28 CN CN201822236812.2U patent/CN210121714U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465512A (en) * | 2018-12-28 | 2019-03-15 | 太仓新思成模具钢有限公司 | A kind of medium spray head for mould steel cutting |
| CN109465512B (en) * | 2018-12-28 | 2024-05-24 | 太仓成和信精密科技有限公司 | Medium spray head for cutting die steel |
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