Nickel-based powder high-temperature alloy bar extrusion structure and extrusion method

Abstract

The invention discloses a nickel-based powder high-temperature alloy bar extrusion structure which comprises an end cover, a powder high-temperature alloy ingot and a base, the powder high-temperature alloy ingot is located between the end cover and the base, the end cover is of a rotary body, the upper portion of the rotary body is of a chamfering structure, the lower portion of the rotary body is of a cylindrical structure, and an end cover through hole is formed in the center of the rotary body. An end cover through hole is formed in the middle of the end cover, and the diameter of the end cover through hole is 50-120mm; the assembling positions of the end cover and the powder high-temperature alloy ingot are connected in a segmented welding mode in the circumferential direction, and the welding positions are wrapped with high-temperature-resistant fiber blankets. The invention further discloses an extrusion method of the nickel-based powder high-temperature alloy bar extrusion structure. The technical problem that the surface of the powder high-temperature alloy bar cracks is solved, and the utilization rate of the powder alloy bar is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a nickel-based powder high-temperature alloy rod extrusion structure and an extrusion method. Background Art

[0002] The working conditions of nickel-based powder high-temperature alloy turbine discs for aircraft engines are harsh, the quality requirements are high, the manufacturing process is complex and difficult, and it is necessary to use large extrusion ratio extrusion deformation to break the metallurgical defects such as the original particle boundary of the powder and the dispersed inclusions, and obtain alloy bars with ultra-fine grains. Powder high-temperature alloys are typical difficult-to-deform materials with large deformation resistance, poor process plasticity, and sensitive organizational properties to processing parameters. The use of upper pads and lower pads (or upper end caps and lower bases) to cover the extrusion process can achieve hot extrusion forming of large-size powder alloy bars, but the head and tail of the extruded powder high-temperature alloy bars have defects such as cracks, and the upper pads and lower pads covered after extrusion are embedded in the powder high-temperature alloy bars. When the head of the powder alloy bar is severely cracked, the embedding depth can reach about 50mm and the length is about 500mm; when the upper pads, lower pads and powder alloy bars are embedded in each other for about 2000mm, the powder alloy bars cannot be used normally, resulting in very low material utilization and a significant increase in cost. Summary of the invention

[0003] The purpose of the present invention is to provide a nickel-based powder high-temperature alloy rod extrusion structure and extrusion method, which solves the technical problem of surface cracking of the powder high-temperature alloy rod and improves the utilization rate of the powder alloy rod.

[0004] To achieve the above purpose, the technical solution used in the present invention is:

[0005] The nickel-based powder high-temperature alloy rod extrusion structure includes: an end cover, a powder high-temperature alloy ingot, and a base. The powder high-temperature alloy ingot is located between the end cover and the base. The structure of the end cover is a rotating body. The upper part of the rotating body is a chamfered structure, and the lower part is a cylindrical structure. An end cover through hole is arranged at the center of the rotating body, and an end cover through hole is arranged in the middle of the end cover. The diameter of the end cover through hole is 50-120mm; the assembly of the end cover and the powder high-temperature alloy ingot is connected by segmented welding in the circumferential direction, and the welding point is wrapped with a high-temperature resistant fiber blanket.

[0006] Furthermore, the chamfered angle of the upper part of the end cap is 60-120°, which is the same as the die angle of the extrusion die, the height of the chamfered part is 100-250 mm, and the flatness of the upper and lower end surfaces of the end cap is 0.1.

[0007] Furthermore, the diameter of the lower cylinder of the end cover differs from the diameter of the powder high-temperature alloy ingot by ±10 mm, and the height of the cylinder section is 50-150 mm.

[0008] Furthermore, the base is a cylindrical structure with a height of 80-160 mm, and the diameter of the base differs from the diameter of the powder high-temperature alloy ingot by ±10 mm.

[0009] Furthermore, high temperature glass powder lubricant is filled between the high temperature resistant fiber blanket and the powder high temperature alloy ingot.

[0010] Furthermore, the high temperature resistant fiber blanket has a thickness of 5 mm to 15 mm and a width of 50 mm to 150 mm.

[0011] Furthermore, the material used for the end cover and the base is austenitic stainless steel such as TP304, TP316, TP321, TP347, etc.

[0012] The extrusion method of the nickel-based powder high-temperature alloy rod extrusion structure comprises:

[0013] The end cover, powder alloy ingot and base are assembled in sequence from top to bottom. The assembly parts of the end cover and powder alloy ingot are welded in sections in the circumferential direction. The weld seams of the end cover and powder high-temperature alloy ingot are wrapped with a high-temperature resistant fiber blanket to form a nickel-based powder high-temperature alloy rod extrusion structure. The nickel-based powder high-temperature alloy rod extrusion structure is used as the billet to be extruded, and the assembly coaxiality is ≤2mm;

[0014] After the extruded billet is sandblasted, the surface of the extruded billet is preheated to 80-150℃, and then anti-oxidation lubricating coating is sprayed on it; the extruded billet is heated to 1050℃-1180℃, and the temperature is kept ≥1.5h / 100mm;

[0015] The billet to be extruded is placed in the extrusion barrel of the vertical extruder, and the extrusion barrel and the extrusion die are preheated to 250℃-350℃; a special glass pad is placed on the upper end of the billet to be extruded for lubrication, the extrusion speed is 18-22mm / s, the extrusion ratio is (4-8):1, and the diameter of the extruded rod is 250-400mm.

[0016] Preferably, the insulation time is ≥10h.

[0017] Preferably, after the extruded blank is heated and taken out of the furnace, a layer of glass powder lubricant is melt-coated on the surface of the extruded blank using a hood-type lubrication device, and then extrusion is performed.

[0018] The technical effects of the present invention include:

[0019] The present invention aims at the problem of low utilization rate of powder high temperature alloy rod extrusion, and improves the utilization rate of powder alloy rods. By designing the end cap and base for powder alloy ingot extrusion, and wrapping the high temperature resistant fiber blanket, the problems of surface cracking of powder high temperature alloy rods and end cap coating rods existing in the coating extrusion process are solved, and the material utilization rate is improved.

[0020] 1. The extrusion powder alloy rod device of the present invention optimizes the structure of the end cover and the base, so that the end cover is directly separated from the rod after extrusion without wrapping; the depth of the base penetrating into the rod is ≤100mm, and the penetrating shape is round head shape, which reduces the waste of powder alloy materials and improves the material utilization rate of the rod.

[0021] 2. The present invention uses a high-temperature resistant fiber blanket to wrap the end cover and the weld of the powder high-temperature alloy ingot, thereby reducing the temperature drop of the high-temperature alloy ingot during transportation after heating, reducing the degree of cracking at the head of the rod by more than 80%, and even reaching a level of no cracks, further improving the material utilization rate of the alloy rod.

[0022] 3. The powder alloy rod extrusion method of the present invention can extrude large-sized rods with a diameter of 250-400 mm, and the material utilization rate is increased by more than 20% compared with the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the nickel-based powder high-temperature alloy rod extrusion method of the present invention. DETAILED DESCRIPTION

[0024] The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce the invention.

[0025] like Figure 1 The figure shows a schematic diagram of the extrusion structure of the nickel-based powder high-temperature alloy rod in the present invention.

[0026] The nickel-based powder high-temperature alloy rod extrusion structure includes: an end cover 1, a powder high-temperature alloy ingot 4, and a base 5. The powder high-temperature alloy ingot 4 is located between the end cover 1 and the base 5. An end cover through hole 11 is provided in the middle of the end cover 1. The assembly of the end cover 1 and the powder high-temperature alloy ingot 4 is welded and connected in sections in the circumferential direction; the welding point is wrapped with a high-temperature resistant fiber blanket 3.

[0027] The structure of the end cover 1 is a rotating body, the upper part of the rotating body is a chamfered structure, and the lower part is a cylindrical structure. The center of the rotating body is provided with an end cover through hole 11, and the diameter of the through hole is 50-120 mm.

[0028] The chamfered angle of the upper part of the end cover 1 is 60-120°, which is the same as the die angle of the extrusion die. The height of the chamfered part is 100-250 mm, and the flatness of the upper and lower end surfaces of the end cover 1 is 0.1.

[0029] The diameter of the lower cylinder of the end cover 1 differs from the diameter of the powder high-temperature alloy ingot 4 by ±10 mm, and the height of the cylinder section is 50-150 mm.

[0030] The base 5 is a cylindrical structure with a height of 80-160 mm. The diameter of the base 5 differs from the diameter of the powder high-temperature alloy ingot 4 by ±10 mm.

[0031] The materials used for the end cover 1 and the base 5 are austenitic stainless steels such as TP304, TP316, TP321, and TP347.

[0032] A high temperature glass powder lubricant is filled between the high temperature resistant fiber blanket 3 and the powder high temperature alloy ingot 4. The high temperature resistant fiber blanket 3 has a thickness of 5 mm to 15 mm and a width of 50 to 150 mm.

[0033] A nickel-based powder high-temperature alloy rod extrusion method, comprising:

[0034] S1: Assemble the end cover 1, the powder alloy ingot 4 and the base 5 in order from top to bottom, weld the assembly of the end cover 1 and the powder alloy ingot 4 in sections in the circumferential direction, wrap the high-temperature resistant fiber blanket 3 around the weld of the end cover 1 and the powder high-temperature alloy ingot 4, and form a nickel-based powder high-temperature alloy rod extrusion structure. The nickel-based powder high-temperature alloy rod extrusion structure is used as the billet to be extruded, the assembly coaxiality is ≤2mm, and the interval of the weld bead 2 is 100-150mm;

[0035] S2: sandblasting of the billet to be extruded;

[0036] S3: After the surface of the extruded billet is preheated to 80-150°C, anti-oxidation lubricating coating is sprayed on it;

[0037] S4: The extruded billet is heated to 1050℃-1180℃, and the temperature is kept for ≥1.5h / 100mm;

[0038] S5: using a hood-type lubrication device to coat a layer of glass powder lubricant on the surface of the extruded blank;

[0039] S6: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 250°C-350°C;

[0040] S7: A special glass pad is placed on the upper end of the billet to be extruded for lubrication, the extrusion speed is 18-22 mm / s, the extrusion ratio is (4-8): 1, and the diameter of the extruded rod is 250-400 mm.

[0041] Example 1: Extruding a powder high-temperature alloy rod with a diameter of Φ250 mm.

[0042] S1: The end cap 1, the powder high temperature alloy ingot 4 and the base 5 are assembled from top to bottom in sequence to form the billet to be extruded, the assembly coaxiality is ≤2mm, the assembly is welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 120mm;

[0043] S2: sandblasting treatment on the surface of the billet to be extruded;

[0044] S3: After the surface of the extruded billet is preheated to 85°C, an anti-oxidation lubricating coating is sprayed on it;

[0045] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0046] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0047] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0048] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 300°C;

[0049] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 5.4:1, and the FGH96 powder high temperature alloy rod is obtained.

[0050] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the stainless steel base at the bottom penetrates 90mm into the length of the rod, and the material utilization rate of the rod is as high as 93%.

[0051] Example 2: Extruding a powder high-temperature alloy rod with a diameter of Φ250 mm.

[0052] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 100mm, the chamfer angle is 100°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 120mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 150mm, and the flatness of the upper and lower end surfaces is 0.1;

[0053] S2: sandblasting treatment on the surface of the billet to be extruded;

[0054] S3: After the surface of the extruded billet is preheated to 90°C, an anti-oxidation lubricating coating is sprayed on it;

[0055] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0056] S5: The extruded billet is heated to 1080°C and kept at this temperature for ≥8h;

[0057] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0058] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0059] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 22 mm / s, the extrusion ratio is 5.4:1, and the FGH96 powder high temperature alloy rod is obtained.

[0060] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 80mm into the rod, the diameter is 250mm, and the material utilization rate of the rod is as high as 93%.

[0061] Example 3: Extruding a powder high-temperature alloy rod with a diameter of Φ300 mm.

[0062] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 100mm, the chamfer angle is 100°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 120mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 150mm, and the flatness of the upper and lower end surfaces is 0.1;

[0063] S2: sandblasting treatment on the surface of the billet to be extruded;

[0064] S3: After the surface of the extruded billet is preheated to 80-150°C, anti-oxidation lubricating coating is sprayed on it;

[0065] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0066] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0067] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0068] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 280°C;

[0069] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 5.4:1, and the FGH96 powder high temperature alloy rod is obtained.

[0070] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 90mm into the rod, the diameter is 300mm, and the material utilization rate of the rod is as high as 94%.

[0071] Example 3: Extruding a powder high-temperature alloy rod with a diameter of Φ310 mm.

[0072] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 100mm, the chamfer angle is 100°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 120mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 150mm, and the flatness of the upper and lower end surfaces is 0.1;

[0073] S2: sandblasting treatment on the surface of the billet to be extruded;

[0074] S3: After the surface of the extruded billet is preheated to 90°C, an anti-oxidation lubricating coating is sprayed on it;

[0075] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0076] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0077] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0078] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 300°C;

[0079] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 5:1, and the FGH96 powder high temperature alloy rod is obtained.

[0080] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 90mm into the rod, the length is 90mm, the diameter is 310mm, and the material utilization rate of the rod is as high as 95%.

[0081] Example 4: Extruding a powder high-temperature alloy rod with a diameter of Φ320 mm.

[0082] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 100mm, the chamfer angle is 100°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 120mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 150mm, and the flatness of the upper and lower end surfaces is 0.1;

[0083] S2: sandblasting treatment on the surface of the billet to be extruded;

[0084] S3: After the surface of the extruded billet is preheated to 100°C, an anti-oxidation lubricating coating is sprayed on it;

[0085] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0086] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0087] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0088] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 310°C;

[0089] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 18 mm / s, the extrusion ratio is 5:1, and the FGH96 powder high temperature alloy rod is obtained.

[0090] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 90mm into the rod, the diameter is 320mm, and the material utilization rate of the rod is as high as 96%.

[0091] Example 4: Extruding a powder high-temperature alloy rod with a diameter of Φ330 mm.

[0092] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 110mm, the chamfer angle is 120°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0093] S2: sandblasting treatment on the surface of the billet to be extruded;

[0094] S3: After the surface of the extruded billet is preheated to 110°C, an anti-oxidation lubricating coating is sprayed on it;

[0095] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0096] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0097] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0098] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 315°C;

[0099] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0100] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 90mm into the rod, the diameter is 330mm, and the material utilization rate of the rod is as high as 96%.

[0101] Example 5: Extruding a powder high-temperature alloy rod with a diameter of Φ340 mm.

[0102] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0103] S2: sandblasting treatment on the surface of the billet to be extruded;

[0104] S3: After the surface of the extruded billet is preheated to 120°C, an anti-oxidation lubricating coating is sprayed on it;

[0105] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0106] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0107] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0108] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 320°C;

[0109] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0110] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 90mm into the rod, the length is 340mm, the diameter is 340mm, and the material utilization rate of the rod is as high as 96%.

[0111] Example 6: Extruding a powder high-temperature alloy rod with a diameter of Φ350 mm.

[0112] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0113] S2: sandblasting treatment on the surface of the billet to be extruded;

[0114] S3: After the surface of the extruded billet is preheated to 125°C, an anti-oxidation lubricating coating is sprayed on it;

[0115] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0116] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0117] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0118] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 325°C;

[0119] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 6.5:1, and the FGH96 powder high temperature alloy rod is obtained.

[0120] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 80mm into the rod, the diameter is 350mm, and the material utilization rate of the rod is as high as 96%.

[0121] Example 7: Extruding a powder high-temperature alloy rod with a diameter of Φ360 mm.

[0122] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0123] S2: sandblasting treatment on the surface of the billet to be extruded;

[0124] S3: After the surface of the extruded billet is preheated to 130°C, an anti-oxidation lubricating coating is sprayed on it;

[0125] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0126] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0127] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0128] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 330°C;

[0129] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 18 mm / s, the extrusion ratio is 7:1, and the FGH96 powder high temperature alloy rod is obtained.

[0130] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 80mm into the rod, the diameter is 360mm, and the material utilization rate of the rod is as high as 96%.

[0131] Example 8: Extruding a powder high-temperature alloy rod with a diameter of Φ370 mm.

[0132] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0133] S2: sandblasting treatment on the surface of the billet to be extruded;

[0134] S3: After the surface of the extruded billet is preheated to 135°C, an anti-oxidation lubricating coating is sprayed on it;

[0135] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0136] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0137] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0138] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 335°C;

[0139] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 18 mm / s, the extrusion ratio is 7:1, and the FGH96 powder high temperature alloy rod is obtained.

[0140] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 370mm, and the material utilization rate of the rod is as high as 96%.

[0141] Example 9: Extruding a powder high-temperature alloy rod with a diameter of Φ375 mm.

[0142] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0143] S2: sandblasting treatment on the surface of the billet to be extruded;

[0144] S3: After the surface of the extruded billet is preheated to 135°C, an anti-oxidation lubricating coating is sprayed on it;

[0145] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0146] S5: The extruded billet is heated to 1080°C and kept warm for ≥10h;

[0147] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0148] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 340°C;

[0149] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 22 mm / s, the extrusion ratio is 7:1, and the FGH96 powder high temperature alloy rod is obtained.

[0150] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 375mm, and the material utilization rate of the rod is as high as 96%.

[0151] Example 10: Extruding a powder high-temperature alloy rod with a diameter of Φ380 mm.

[0152] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0153] S2: sandblasting treatment on the surface of the billet to be extruded;

[0154] S3: After the surface of the extruded billet is preheated to 140°C, an anti-oxidation lubricating coating is sprayed on it;

[0155] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0156] S5: The extruded billet is heated to 1050°C and kept warm for ≥10h;

[0157] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0158] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 340°C;

[0159] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 7:1, and the FGH96 powder high temperature alloy rod is obtained.

[0160] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 75mm into the rod, the diameter is 380mm, and the material utilization rate of the rod is as high as 96%.

[0161] Example 11: Extruding a powder high-temperature alloy rod with a diameter of Φ390 mm.

[0162] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0163] S2: sandblasting treatment on the surface of the billet to be extruded;

[0164] S3: After the surface of the extruded billet is preheated to 140°C, an anti-oxidation lubricating coating is sprayed on it;

[0165] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0166] S5: The extruded billet is heated to 1100°C and kept warm for ≥10h;

[0167] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0168] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 345°C;

[0169] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 21 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0170] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 390mm, and the material utilization rate of the rod is as high as 96%.

[0171] Example 12: Extruding a powder high-temperature alloy rod with a diameter of Φ390 mm.

[0172] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0173] S2: sandblasting treatment on the surface of the billet to be extruded;

[0174] S3: After the surface of the extruded billet is preheated to 145°C, an anti-oxidation lubricating coating is sprayed on it;

[0175] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0176] S5: The extruded billet is heated to 1150°C and kept warm for ≥10h;

[0177] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0178] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 345°C;

[0179] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 5:1, and the FGH96 powder high temperature alloy rod is obtained.

[0180] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 390mm, and the material utilization rate of the rod is as high as 96%.

[0181] Example 13: Extruding a powder high-temperature alloy rod with a diameter of Φ390 mm.

[0182] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0183] S2: sandblasting treatment on the surface of the billet to be extruded;

[0184] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0185] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0186] S5: The extruded billet is heated to 1150°C and kept warm for ≥10h;

[0187] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0188] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0189] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 18 mm / s, the extrusion ratio is 4:1, and the FGH96 powder high temperature alloy rod is obtained.

[0190] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 390mm, and the material utilization rate of the rod is as high as 96%.

[0191] Example 14: Extruding a powder high-temperature alloy rod with a diameter of Φ395 mm.

[0192] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0193] S2: sandblasting treatment on the surface of the billet to be extruded;

[0194] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0195] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0196] S5: The extruded billet is heated to 1150°C and kept warm for ≥10h;

[0197] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0198] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0199] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0200] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base is 75mm deep into the rod, the diameter is 395mm, and the material utilization rate of the rod is as high as 96%.

[0201] Example 15: Extruding a powder high-temperature alloy rod with a diameter of Φ400 mm.

[0202] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0203] S2: sandblasting treatment on the surface of the billet to be extruded;

[0204] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0205] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0206] S5: The extruded billet is heated to 1160°C and kept warm for ≥10h;

[0207] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0208] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0209] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0210] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 75mm into the rod, the diameter is 400mm, and the material utilization rate of the rod is as high as 96%.

[0211] Example 16: Extruding a powder high-temperature alloy rod with a diameter of Φ400 mm.

[0212] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0213] S2: sandblasting treatment on the surface of the billet to be extruded;

[0214] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0215] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0216] S5: The extruded billet is heated to 1170°C and kept warm for ≥10h;

[0217] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0218] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0219] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 20 mm / s, the extrusion ratio is 6:1, and the FGH96 powder high temperature alloy rod is obtained.

[0220] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 75mm into the rod, the diameter is 400mm, and the material utilization rate of the rod is as high as 96%.

[0221] Example 17: Extruding a powder high-temperature alloy rod with a diameter of Φ400 mm.

[0222] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0223] S2: sandblasting treatment on the surface of the billet to be extruded;

[0224] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0225] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0226] S5: The extruded billet is heated to 1175°C and kept warm for ≥10h;

[0227] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0228] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0229] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 19 mm / s, the extrusion ratio is 7:1, and the FGH96 powder high temperature alloy rod is obtained.

[0230] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 75mm into the rod, the diameter is 400mm, and the material utilization rate of the rod is as high as 96%.

[0231] Example 18: Extruding a powder high-temperature alloy rod with a diameter of Φ400 mm.

[0232] S1: The end cover 1, the powder high temperature alloy ingot 4 and the base 5 are assembled in sequence from top to bottom to form the billet to be extruded, the assembly coaxiality is ≤2mm, the diameter of the end cover through hole 11 is 120mm, the chamfer angle is 150°, the end cover 1 and the powder high temperature alloy ingot 4 are welded in sections in the circumferential direction, the welding rod is A507, two layers are welded, and the weld interval is 100mm; the chamfer angle is the same as the extrusion die angle, the height of the chamfered part is 200mm, and the flatness of the upper and lower end surfaces is 0.1;

[0233] S2: sandblasting treatment on the surface of the billet to be extruded;

[0234] S3: After the surface of the extruded billet is preheated to 150°C, an anti-oxidation lubricating coating is sprayed on it;

[0235] S4: The weld is wrapped with high temperature resistant fiber blanket and high temperature resistant glass powder;

[0236] S5: The extruded billet is heated to 1180°C and kept warm for ≥10h;

[0237] S6: After the extruded billet is heated to temperature, a layer of glass powder lubricant is melted on its surface using a hood-type lubrication device after it is taken out of the furnace;

[0238] S7: placing the billet to be extruded into the extrusion barrel of the vertical extruder, and preheating the extrusion barrel and the extrusion die to 350°C;

[0239] S8: A special glass pad is placed on the upper end of the extruded billet for lubrication, the extrusion speed is 22 mm / s, the extrusion ratio is 4:1, and the FGH96 powder high temperature alloy rod is obtained.

[0240] There are no defects on the surface of the extruded rod, no covering phenomenon on the head of the rod, the bottom stainless steel base penetrates 75mm into the rod, the diameter is 400mm, and the material utilization rate of the rod is as high as 95%.

[0241] 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 nickel-based powder high-temperature alloy rod extrusion structure, characterized in that: include: An end cover, a powder high-temperature alloy ingot and a base. The powder high-temperature alloy ingot is located between the end cover and the base. The structure of the end cover is a rotating body. The upper part of the rotating body is a chamfered structure, and the lower part is a cylindrical structure. An end cover through hole is arranged at the center of the rotating body, and an end cover through hole is arranged in the middle of the end cover. The diameter of the end cover through hole is 50-120mm. The assembly of the end cover and the powder high-temperature alloy ingot is connected by segmented welding in the circumferential direction, and the welding point is wrapped with a high-temperature resistant fiber blanket.

2. The nickel-based powder high-temperature alloy rod extrusion structure according to claim 1, characterized in that: The upper chamfer angle of the end cover is 60-120 degrees, the chamfer angle is the same as the die angle of the extrusion die, the height of the chamfered part is 100-250mm, and the flatness of the upper and lower end surfaces of the end cover is 0.

1.

3. The nickel-based powder high-temperature alloy rod extrusion structure according to claim 1, characterized in that: The diameter of the lower cylinder of the end cover differs from the diameter of the powder high-temperature alloy ingot by ±10 mm, and the height of the cylinder section is 50-150 mm.

4. The nickel-based powder high-temperature alloy rod extrusion structure according to claim 3, characterized in that: The base is a cylindrical structure with a height of 80-160 mm. The diameter of the base differs from the diameter of the powder high-temperature alloy ingot by ±10 mm.

5. The nickel-based powder high-temperature alloy rod extrusion structure according to claim 1, characterized in that: High-temperature glass powder lubricant is filled between the high-temperature resistant fiber blanket and the powder high-temperature alloy ingot.

6. The nickel-based powder high-temperature alloy rod extrusion structure according to claim 1, characterized in that: The thickness of the high temperature resistant fiber blanket is 5mm-15mm and the width is 50-150mm.

7. The nickel-based powder high-temperature alloy rod extrusion structure according to any one of claims 1 to 6, characterized in that: The materials used for the end cover and base are austenitic stainless steel such as TP304, TP316, TP321, TP347, etc.

8. The extrusion method of the nickel-based powder high-temperature alloy rod extrusion structure according to any one of claims 1 to 6, characterized in that: include: The end cover, powder alloy ingot and base are assembled in sequence from top to bottom. The assembly parts of the end cover and powder alloy ingot are welded in sections in the circumferential direction. The weld seams of the end cover and powder high-temperature alloy ingot are wrapped with a high-temperature resistant fiber blanket to form a nickel-based powder high-temperature alloy rod extrusion structure. The nickel-based powder high-temperature alloy rod extrusion structure is used as the billet to be extruded, and the assembly coaxiality is ≤2mm; After the extruded billet is sandblasted, the surface of the extruded billet is preheated to 80-150℃, and then anti-oxidation lubricating coating is sprayed on it; the extruded billet is heated to 1050℃-1180℃, and the temperature is kept ≥1.5h / 100mm; The billet to be extruded is placed in the extrusion barrel of the vertical extruder, and the extrusion barrel and the extrusion die are preheated to 250℃-350℃; a special glass pad is placed on the upper end of the billet to be extruded for lubrication, the extrusion speed is 18-22mm / s, the extrusion ratio is (4-8):1, and the diameter of the extruded rod is 250-400mm.

9. The extrusion method according to claim 8, characterized in that Insulation time ≥10h.

10. The extrusion method according to claim 8, characterized in that After the extruded blank is heated and taken out of the furnace, a layer of glass powder lubricant is melted on the surface of the extruded blank using a hood-type lubrication device, and then extrusion is performed.

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