Large-length-diameter-ratio perforating needle structure for closed perforating and manufacturing method of large-length-diameter-ratio perforating needle structure

Abstract

The large-length-diameter-ratio perforating needle structure comprises a perforating needle connecting section, a strengthening section and a sizing section, the perforating needle connecting section and the sizing section are connected to the two ends of the strengthening section respectively, and the outer diameter of the perforating needle connecting section, the outer diameter of the strengthening section and the outer diameter of the sizing section are sequentially decreased; the perforating needle connecting section, the strengthening section and the sizing section are cylindrical, the connecting position of the perforating needle connecting section and the strengthening section and the circumferential surfaces of the strengthening section and the sizing section are in smooth transition through chamfers and fillets, and the two fillets are located at the two ends of the chamfers respectively. The invention discloses a manufacturing method of a large-length-diameter-ratio perforating needle structure for closed perforating. The problem that a large-length-diameter-ratio small-size perforating needle is short in service life is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of perforating needles for closed-type perforation of metal materials, and in particular relates to a perforating needle structure with a large aspect ratio for closed-type perforation and a manufacturing method thereof. Background Art

[0002] The piercing needle is in contact with the high-temperature steel ingot when working. During the piercing process, the piercing needle is subjected to high temperature, high pressure, and severe friction. After the piercing is completed, the piercing needle cools down. The piercing needle is used in a cycle under the state of rapid cooling and heating. The working conditions are extremely harsh. In actual production, hot working die steel is generally used to make piercing needles, but its strength and rigidity decrease at high temperatures, especially when the aspect ratio of the piercing needle is ≥8. During the piercing process, it is often scrapped due to bending or severe wear of the head of the piercing needle working section. The short service life of the piercing needle seriously affects the production efficiency of piercing and the cost of using the mold.

[0003] Laser cladding is one of the important means of material surface modification technology. It uses high-energy laser beams to irradiate the surface of the base metal, and quickly melts, expands and solidifies the alloy powder, and quickly cools it to form a cladding layer on the surface of the base that has the same composition as the alloy being coated and has good metallurgical bonding. This technology can not only meet the requirements for material surface properties, but also save a large amount of precious metal raw materials; it can be used for both surface modification and surface repair.

[0004] However, how to apply laser cladding technology to the preparation of perforating needles is a technical problem that needs to be solved at present. Summary of the invention

[0005] The purpose of the present invention is to provide a perforating needle structure with a large aspect ratio for closed perforation and a manufacturing method, which solves the problem of low service life of perforating needles with a large aspect ratio and small size, improves the service life of the perforating needle, and reduces the number of times the perforating needle is replaced.

[0006] To achieve the above purpose, the technical solution used in the present invention is:

[0007] A perforating needle structure with a large aspect ratio for closed perforation comprises: a perforating needle connecting section, a strengthening section, and a sizing section. The perforating needle connecting section and the sizing section are respectively connected to the two ends of the strengthening section, and the outer diameters of the perforating needle connecting section, the strengthening section, and the sizing section decrease in sequence; the perforating needle connecting section, the strengthening section, and the sizing section are all cylindrical, and the connection position of the perforating needle connecting section and the strengthening section, as well as the circumferential surfaces of the strengthening section and the sizing section are smoothly transitioned by chamfering and rounding, and the two roundings are respectively located at the two ends of the chamfer.

[0008] Furthermore, the angle between the chamfer and the center line of the perforating needle is 120°-150°, and the radius of the fillet is 10-20 mm.

[0009] Furthermore, the included angle is 135° and the radius of the fillet is 15 mm.

[0010] Furthermore, the material of the closed-type perforating needle structure with a large aspect ratio is heat-resistant die steel H13.

[0011] Furthermore, the total length of the closed perforation needle structure with a large aspect ratio is 2500-3500 mm, and the aspect ratio is ≥8.

[0012] Furthermore, the length of the sizing section is ≤1500 mm, the diameter of the strengthening section is ≥500 mm, and the diameter of the perforating needle connecting section is ≤470 mm.

[0013] Furthermore, the total length of the perforating needle is 3000 mm, and the aspect ratio is 10; the length of the sizing section is 1200 mm, the diameter of the connecting section is 500 mm, the connecting section is long, and the diameter of the 400 mm strengthening section is 470 mm.

[0014] A method for preparing a perforating needle structure with a large aspect ratio for closed perforation, comprising:

[0015] The electrode blank is obtained by smelting H13 steel in an electric furnace, refining outside the furnace, vacuum degassing and casting; the electrode blank is re-dissolved by electroslag, the gas content [H] is ≤2ppm, [0] is ≤30ppm, and the amount of electroslag ingot tail removed is ≥50mm;

[0016] After the electroslag ingot is heated, it is forged to obtain a forging, with a forging ratio of ≥4. The forging is immediately annealed after forging; the forging after annealing is first rough-machined, leaving a 5-10mm finishing allowance, and the rough-machined forging is quenched + tempered;

[0017] The forging is finely processed into a piercing needle, and the laser cladding area at the head of the sizing section 3 is laser clad, the thickness of the laser cladding layer is ≥2mm, the surface hardness of the cladding area is ≥40HRC, and the cladding material is a nickel-based or cobalt-based high-temperature resistant material.

[0018] Preferably, the laser cladding area is an arc surface, the diameter of which is 4 to 5 mm smaller than the head diameter of the finished product sizing section, and the length of which is ≥ 100 mm of the head length of the sizing section.

[0019] Preferably, the composition of the cobalt-based high temperature resistant material is Co≥40%, Cr≥20%, and W≥8%.

[0020] The technical effects of the present invention include:

[0021] The present invention designs a stepped piercing needle structure according to the equipment structure and product size, and strengthens the surface of the head of the working part of the piercing needle by laser cladding, thereby increasing the service life of the piercing needle, reducing the number of times the piercing needle is replaced, improving production efficiency, and reducing mold costs.

[0022] 1. The punching needle of the present invention is designed as a stepped structure, which improves its strength and bending rigidity during punching. The head of the punching needle is laser-clad with high-temperature resistant high-strength material, which improves its surface hardness and strength, effectively reduces the wear of the head of the punching needle during punching, and improves its service life.

[0023] 2. The large aspect ratio perforating needle structure and manufacturing method of the present invention has a sizing section at the working part of the perforating needle with a small diameter, and a reinforcing section at the non-working part with an enlarged size, thereby improving strength and rigidity and reducing bending deformation during the perforation process.

[0024] 3. In order to solve the problems of poor bending resistance and low service life of piercing needles with large aspect ratio, a stepped piercing needle structure is designed according to the equipment structure and product size, and the surface of the head of the working part of the piercing needle is strengthened by laser cladding, which can improve the service life of the piercing needle, reduce the number of replacement times of the piercing needle, improve production efficiency, and reduce the cost of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the perforating needle with a large aspect ratio for closed perforation in the present invention.

[0026] Figure 2 This is a diagram showing the use state of the closed-type perforating needle structure with a large aspect ratio in the present invention;

[0027] Figure 3 is a schematic diagram of head wear of a perforating needle structure without laser cladding in a comparative example;

[0028] Figure 4 It is a schematic diagram of the head wear of the perforating needle structure with a large aspect ratio for closed perforation in the present invention. DETAILED DESCRIPTION

[0029] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0030] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0032] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0035] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0036] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other. The following description fully illustrates the specific embodiments of the present invention so that those skilled in the art can practice and reproduce.

[0037] like Figure 1 The figure is a schematic diagram of the structure of the perforating needle with a large aspect ratio for closed perforation in the present invention.

[0038] The perforating needle structure with a large aspect ratio for closed perforation comprises: a perforating needle connecting section 1, a strengthening section 2, and a sizing section 3. The perforating needle connecting section 1 and the sizing section 3 are respectively connected to both ends of the strengthening section 2, and the outer diameters of the perforating needle connecting section 1, the strengthening section 2, and the sizing section 3 decrease in sequence.

[0039] The structure of the small-size perforating needle is that the sizing section of the working part has a small diameter and the strengthening section of the non-working part has an enlarged size, thereby improving the strength and rigidity and reducing the bending deformation generated during the perforation process.

[0040] The piercing needle connecting section 1, the strengthening section 2, and the sizing section 3 are all cylindrical, and the connection position of the piercing needle connecting section 1 and the strengthening section 2, as well as the circumferential surfaces of the strengthening section 2 and the sizing section 3 are smoothly transitioned by chamfers and fillets. The two fillets are located at both ends of the chamfer.

[0041] The angle between the chamfer and the center line of the piercing needle is 120°-150°, and the radius of the fillet is R10-R20.

[0042] The material of the large aspect ratio perforating needle structure for closed perforation is heat-resistant die steel H13.

[0043] The total length of the perforating needle structure with a large aspect ratio for closed perforation is 2500-3500mm, and the aspect ratio is ≥8; the length of the sizing section 3 is ≤1500mm, the diameter of the strengthening section 2 is ≥500mm, and the diameter of the perforating needle connecting section 1 is ≤470mm.

[0044] like Figure 2 The figure shows the usage state of the perforating needle structure with a large aspect ratio for closed perforation in the present invention.

[0045] The piercing needle connecting section 1 is used to connect the frame 4 , and the head of the sizing section 3 extends into the blank 5 in the upsetting tube 6 and extends out from the through hole at the bottom of the upsetting tube 6 to achieve piercing of the blank 5 .

[0046] The preparation method of the perforating needle structure with a large aspect ratio for closed perforation comprises the following steps:

[0047] S1: Smelting H13 steel in an electric furnace, refining outside the furnace, vacuum degassing, and casting to obtain electrode blanks;

[0048] S2: The electrode blank is re-dissolved by electroslag, the gas content [H] ≤ 2ppm, [0] ≤ 30ppm, and the amount of electroslag ingot tail removed is ≥ 50mm;

[0049] S3: The electroslag ingot is heated and forged to obtain a forging, the forging ratio is ≥4, and the forging is immediately annealed after forging;

[0050] S4: The forgings are first rough-machined, leaving a 5-10mm finishing allowance;

[0051] S5: Quenching and tempering of rough-machined forgings;

[0052] S6: The forging is finely processed into a piercing needle, and the laser cladding area at the head of the sizing section 3 is laser clad. The thickness of the laser cladding layer is ≥2mm, the surface hardness of the cladding area is ≥40HRC, and the cladding material is a nickel-based or cobalt-based high-temperature resistant material.

[0053] The laser cladding area is an arc surface, the diameter of which is 4 to 5 mm smaller than the head diameter of the finished product sizing section 3, and the length of which is ≥ 100 mm of the head length of the sizing section 3.

[0054] S7: Processing the laser cladding area to the finished product size.

[0055] like Figure 3 As shown, it is a schematic diagram of the head wear of the perforating needle structure without laser cladding in the comparative example; Figure 4 The figure is a schematic diagram of the head wear of the perforating needle structure with a large aspect ratio for closed perforation in the present invention.

[0056] The head of the working section of the piercing needle without laser cladding is seriously worn, while the head of the working section of the piercing needle with laser cladding in the present invention is less worn.

[0057] Example 1

[0058] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0059] 1. The material of the piercing needle is heat-resistant die steel H13;

[0060] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 500mm, the diameter of the strengthening section 2 is 470mm, and the length of the connecting section is 400mm;

[0061] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 135° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0062] The manufacturing method of the punch needle comprises the following steps:

[0063] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0064] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1.5ppm, [O] is 25ppm, and the removal amount of the tail of the electroslag ingot should be 50mm;

[0065] S3: The electroslag ingot is heated and forged with a forging ratio of 6.2, and annealing is performed immediately after forging;

[0066] S4: The forging is first rough-machined, leaving 8mm finishing allowance;

[0067] S5: Quenching and tempering of rough-machined forgings;

[0068] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4.5 mm smaller than the finished product size;

[0069] S7: The 100mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0070] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0071] Example 2

[0072] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0073] 1. The material of the piercing needle is heat-resistant die steel H13;

[0074] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 505mm, the diameter of the strengthening section 2 is 465mm, and the length of the connecting section is 400mm;

[0075] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 135° with the center line of the perforating needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0076] The manufacturing method of the punch needle comprises the following steps:

[0077] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0078] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 1.4ppm, [O] is 20ppm, and the amount of electroslag ingot tail removed should be 55mm;

[0079] S3: The electroslag ingot is heated and forged with a forging ratio of 6, and annealing is performed immediately after forging;

[0080] S4: The forging is first rough-machined, leaving a 7mm finishing allowance;

[0081] S5: Quenching and tempering of rough-machined forgings;

[0082] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0083] S7: The 105mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0084] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0085] Example 3

[0086] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0087] 1. The material of the piercing needle is heat-resistant die steel H13;

[0088] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 510mm, the diameter of the strengthening section 2 is 460mm, and the length of the connecting section is 420mm;

[0089] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0090] The manufacturing method of the punch needle comprises the following steps:

[0091] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0092] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 1.4ppm, [O] is 20ppm, and the amount of electroslag ingot tail removed should be 55mm;

[0093] S3: The electroslag ingot is heated and forged with a forging ratio of 5, and annealing is performed immediately after forging;

[0094] S4: The forging is first rough-machined, leaving a 7mm finishing allowance;

[0095] S5: Quenching and tempering of rough-machined forgings;

[0096] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0097] S7: The 110mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0098] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0099] Example 4

[0100] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0101] 1. The material of the piercing needle is heat-resistant die steel H13;

[0102] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0103] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0104] The manufacturing method of the punch needle comprises the following steps:

[0105] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0106] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1.8ppm, [O] is 25ppm, and the removal amount of the tail of the electroslag ingot should be 60mm;

[0107] S3: The electroslag ingot is heated and forged with a forging ratio of 5, and annealing is performed immediately after forging;

[0108] S4: The forging is first rough-machined, leaving a 5mm finishing allowance;

[0109] S5: Quenching and tempering of rough-machined forgings;

[0110] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0111] S7: The 115mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0112] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0113] Example 5

[0114] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0115] 1. The material of the piercing needle is heat-resistant die steel H13;

[0116] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0117] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 150° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R20 fillets.

[0118] The manufacturing method of the punch needle comprises the following steps:

[0119] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0120] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1.8ppm, [O] is 25ppm, and the removal amount of the tail of the electroslag ingot should be 60mm;

[0121] S3: The electroslag ingot is heated and forged with a forging ratio of 5, and annealing is performed immediately after forging;

[0122] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0123] S5: Quenching and tempering of rough-machined forgings;

[0124] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0125] S7: The 100mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0126] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0127] Example 6

[0128] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0129] 1. The material of the piercing needle is heat-resistant die steel H13;

[0130] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0131] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 145° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0132] The manufacturing method of the punch needle comprises the following steps:

[0133] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0134] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 2ppm, [O] is 15ppm, and the amount of electroslag ingot tail removed should be 60mm;

[0135] S3: The electroslag ingot is heated and forged with a forging ratio of 5, and annealing is performed immediately after forging;

[0136] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0137] S5: Quenching and tempering of rough-machined forgings;

[0138] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0139] S7: The 120mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0140] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0141] Example 7

[0142] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0143] 1. The material of the piercing needle is heat-resistant die steel H13;

[0144] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 15, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0145] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 145° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0146] The manufacturing method of the punch needle comprises the following steps:

[0147] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0148] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 2ppm, [O] is 10ppm, and the amount of electroslag ingot tail removed should be 60mm;

[0149] S3: The electroslag ingot is heated and forged with a forging ratio of 8, and annealing is performed immediately after forging;

[0150] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0151] S5: Quenching and tempering of rough-machined forgings;

[0152] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0153] S7: The 120mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0154] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0155] Example 8

[0156] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0157] 1. The material of the piercing needle is heat-resistant die steel H13;

[0158] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 20, the length of the sizing section 3 is 1500mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0159] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 145° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0160] The manufacturing method of the punch needle comprises the following steps:

[0161] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0162] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 2ppm, [O] is 10ppm, and the amount of electroslag ingot tail removed should be 60mm;

[0163] S3: The electroslag ingot is heated and forged with a forging ratio of 7, and annealing is performed immediately after forging;

[0164] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0165] S5: Quenching and tempering of rough-machined forgings;

[0166] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0167] S7: The 130mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0168] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0169] Example 9

[0170] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0171] 1. The material of the piercing needle is heat-resistant die steel H13;

[0172] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 8, the length of the sizing section 3 is 1000mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0173] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0174] The manufacturing method of the punch needle comprises the following steps:

[0175] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0176] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 2ppm, [O] is 10ppm, and the amount of electroslag ingot tail removed should be 70mm;

[0177] S3: The electroslag ingot is heated and forged, with a forging ratio of 10, and annealing is performed immediately after forging;

[0178] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0179] S5: Quenching and tempering of rough-machined forgings;

[0180] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0181] S7: The 130mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0182] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0183] Example 10

[0184] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0185] 1. The material of the piercing needle is heat-resistant die steel H13;

[0186] 2. The total length of the perforating needle is 3500mm, the aspect ratio is 8, the length of the sizing section 3 is 1500mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0187] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0188] The manufacturing method of the punch needle comprises the following steps:

[0189] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0190] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 2ppm, [O] is 10ppm, and the amount of electroslag ingot tail removed should be 70mm;

[0191] S3: The electroslag ingot is heated and forged with a forging ratio of 15, and annealing is performed immediately after forging;

[0192] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0193] S5: Quenching and tempering of rough-machined forgings;

[0194] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0195] S7: The 140mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0196] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0197] Example 10

[0198] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ300mm:

[0199] 1. The material of the piercing needle is heat-resistant die steel H13;

[0200] 2. The total length of the perforating needle is 3400mm, the aspect ratio is 8, the length of the sizing section 3 is 1400mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0201] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 125° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0202] The manufacturing method of the punch needle comprises the following steps:

[0203] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0204] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1ppm, [0] is 10ppm, and the removal amount of the tail of the electroslag ingot should be 70mm;

[0205] S3: The electroslag ingot is heated and forged, with a forging ratio of 10, and annealing is performed immediately after forging;

[0206] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0207] S5: Quenching and tempering of rough-machined forgings;

[0208] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0209] S7: The 120mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0210] S8: The cladding area of ​​the perforating needle is processed to Φ300mm.

[0211] Embodiment 11

[0212] The structure and manufacturing method of the working section of the perforating needle with a diameter of Φ200mm:

[0213] 1. The material of the piercing needle is heat-resistant die steel H13;

[0214] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1300mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0215] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 125° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0216] The manufacturing method of the punch needle comprises the following steps:

[0217] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0218] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1ppm, [0] is 10ppm, and the removal amount of the tail of the electroslag ingot should be 70mm;

[0219] S3: The electroslag ingot is heated and forged with a forging ratio of 12, and annealing is performed immediately after forging;

[0220] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0221] S5: Quenching and tempering of rough-machined forgings;

[0222] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0223] S7: The 120mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0224] S8: The cladding area of ​​the perforating needle is processed to Φ200mm.

[0225] Example 12

[0226] The structure and manufacturing method of the working section of the perforating needle with a diameter of Φ200mm:

[0227] 1. The material of the piercing needle is heat-resistant die steel H13;

[0228] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1300mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0229] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 150° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R15 fillets.

[0230] The manufacturing method of the punch needle comprises the following steps:

[0231] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0232] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 2ppm, [O] is 20ppm, and the removal amount of the tail of the electroslag ingot should be 70mm;

[0233] S3: The electroslag ingot is heated and forged with a forging ratio of 15, and annealing is performed immediately after forging;

[0234] S4: The forging is first rough-machined, leaving 8mm finishing allowance;

[0235] S5: Quenching and tempering of rough-machined forgings;

[0236] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0237] S7: The 110mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0238] S8: The cladding area of ​​the perforating needle is processed to Φ200mm.

[0239] Example 13

[0240] The structure and manufacturing method of the working section of the punch needle with a diameter of Φ150mm:

[0241] 1. The material of the piercing needle is heat-resistant die steel H13;

[0242] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 10, the length of the sizing section 3 is 1300mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0243] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R10 fillets.

[0244] The manufacturing method of the punch needle comprises the following steps:

[0245] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0246] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 2ppm, [O] is 20ppm, and the removal amount of the tail of the electroslag ingot should be 70mm;

[0247] S3: The electroslag ingot is heated and forged with a forging ratio of 20, and annealing is performed immediately after forging;

[0248] S4: The forging is first rough-machined, leaving 8mm finishing allowance;

[0249] S5: Quenching and tempering of rough-machined forgings;

[0250] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0251] S7: The 140mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0252] S8: The cladding area of ​​the perforating needle is processed to Φ150mm.

[0253] Embodiment 14

[0254] The structure and manufacturing method of the working section of the perforating needle with a diameter of Φ250mm:

[0255] 1. The material of the piercing needle is heat-resistant die steel H13;

[0256] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 20, the length of the sizing section 3 is 1300mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0257] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 120° with the center line of the perforating needle, and the two ends of the chamfer are transitioned by R20 fillets.

[0258] The manufacturing method of the punch needle comprises the following steps:

[0259] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0260] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 2ppm, [O] is 20ppm, and the removal amount of the tail of the electroslag ingot should be 70mm;

[0261] S3: The electroslag ingot is heated and forged with a forging ratio of 15, and annealing is performed immediately after forging;

[0262] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0263] S5: Quenching and tempering of rough-machined forgings;

[0264] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0265] S7: The 140mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0266] S8: The cladding area of ​​the perforating needle is processed to Φ250mm.

[0267] Embodiment 15

[0268] The structure and manufacturing method of the working section of the perforating needle with a diameter of Φ250mm:

[0269] 1. The material of the piercing needle is heat-resistant die steel H13;

[0270] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 30, the length of the sizing section 3 is 1300mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0271] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 150° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R20 fillets.

[0272] The manufacturing method of the punch needle comprises the following steps:

[0273] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0274] S2: Electrode blank electroslag re-dissolution, gas content: [H] is 1ppm, [O] is 5ppm, and the amount of electroslag ingot tail removed should be 70mm;

[0275] S3: The electroslag ingot is heated and forged with a forging ratio of 25, and annealing is performed immediately after forging;

[0276] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0277] S5: Quenching and tempering of rough-machined forgings;

[0278] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0279] S7: The 130mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0280] S8: The cladding area of ​​the perforating needle is processed to Φ250mm.

[0281] Example 16

[0282] The structure and manufacturing method of the working section of the perforating needle with a diameter of Φ2000mm:

[0283] 1. The material of the piercing needle is heat-resistant die steel H13;

[0284] 2. The total length of the perforating needle is 3000mm, the aspect ratio is 20, the length of the sizing section 3 is 1200mm, the diameter of the connecting section 1 is 512mm, the diameter of the strengthening section 2 is 450mm, and the length of the connecting section is 450mm;

[0285] 3. The connection section 1 and the reinforcement section 2 as well as the reinforcement section 2 and the working section 3 are transitioned by a chamfer with an angle of 150° with the center line of the piercing needle, and the two ends of the chamfer are transitioned by R20 fillets.

[0286] The manufacturing method of the punch needle comprises the following steps:

[0287] S1: Smelting H13 steel in electric furnace, refining outside the furnace, vacuum degassing, casting electrode blanks.

[0288] S2: Electroslag re-dissolving of electrode blank, gas content: [H] is 1ppm, [O] is 4ppm, and the removal amount of the tail of the electroslag ingot should be 50mm;

[0289] S3: The electroslag ingot is heated and forged with a forging ratio of 20, and annealing is performed immediately after forging;

[0290] S4: The forging is first rough-machined, leaving a 10mm finishing allowance;

[0291] S5: Quenching and tempering of rough-machined forgings;

[0292] S6: Finished into a perforating needle, the diameter of the laser cladding area at the head of the sizing section 3 is 4 mm smaller than the finished product size;

[0293] S7: The 130mm long arc surface of the head of the piercing needle working section is laser clad, the thickness of the laser cladding layer is 2.1mm, the surface hardness of the cladding area is 43HRC, the cladding material is cobalt-based high temperature resistant material, the main components of the material are Co≥40%, Cr≥20%, W≥8%, etc.

[0294] S8: The cladding area of ​​the perforating needle is processed to Φ200mm.

[0295] The terms used in the present invention are illustrative and exemplary, rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A closed perforation needle structure with a large aspect ratio, characterized in that: include: The perforating needle connecting section, the strengthening section and the sizing section are respectively connected to the two ends of the strengthening section, and the outer diameters of the perforating needle connecting section, the strengthening section and the sizing section decrease successively; the perforating needle connecting section, the strengthening section and the sizing section are all cylindrical, and the connection position of the perforating needle connecting section and the strengthening section, as well as the circumferential surfaces of the strengthening section and the sizing section are smoothly transitioned by chamfers and fillets, and the two fillets are respectively located at the two ends of the chamfer.

2. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The angle between the chamfer and the center line of the perforating needle is 120°-150°, and the radius of the fillet is 10-20mm.

3. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The included angle is 135° and the radius of the fillet is 15 mm.

4. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The material of the large aspect ratio perforating needle structure for closed perforation is heat-resistant die steel H13.

5. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The total length of the large aspect ratio perforating needle structure for closed perforation is 2500-3500mm, and the aspect ratio is ≥8.

6. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The length of the sizing section is ≤1500mm, the diameter of the strengthening section is ≥500mm, and the diameter of the perforating needle connecting section is ≤470mm.

7. The closed-type perforating needle structure with a large aspect ratio as claimed in claim 1, characterized in that: The total length of the perforating needle is 3000mm, and the aspect ratio is 10; the length of the sizing section is 1200mm, the diameter of the connecting section is 500mm, the connecting section is 400mm long, and the diameter of the strengthening section is 470mm.

8. The method for preparing a closed perforating needle structure with a large aspect ratio according to any one of claims 1 to 7, characterized in that: include: The electrode blank is obtained by smelting H13 steel in an electric furnace, refining outside the furnace, vacuum degassing and casting; the electrode blank is re-dissolved by electroslag, the gas content [H] is ≤2ppm, [0] is ≤30ppm, and the amount of electroslag ingot tail removed is ≥50mm; After the electroslag ingot is heated, it is forged to obtain a forging, with a forging ratio of ≥4. The forging is immediately annealed after forging; the forging after annealing is first rough-machined, leaving a 5-10mm finishing allowance, and the rough-machined forging is quenched + tempered; The forging is finely processed into a piercing needle, and the laser cladding area at the head of the sizing section 3 is laser clad, the thickness of the laser cladding layer is ≥2mm, the surface hardness of the cladding area is ≥40HRC, and the cladding material is a nickel-based or cobalt-based high-temperature resistant material.

9. The method for preparing a closed perforating needle structure with a large aspect ratio according to claim 8, characterized in that: The laser cladding area is an arc surface, the diameter of which is 4 to 5 mm smaller than the head diameter of the finished sizing section, and the length of which is ≥ 100 mm of the head length of the sizing section.

10. The method for preparing a closed perforating needle structure with a large aspect ratio according to claim 8, characterized in that: The composition of cobalt-based high-temperature resistant materials is Co≥40%, Cr≥20%, and W≥8%.

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