CN106735227B - Hot isostatic pressing preparation method of threaded element of double-screw extruder - Google Patents
Hot isostatic pressing preparation method of threaded element of double-screw extruder Download PDFInfo
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- CN106735227B CN106735227B CN201611138566.6A CN201611138566A CN106735227B CN 106735227 B CN106735227 B CN 106735227B CN 201611138566 A CN201611138566 A CN 201611138566A CN 106735227 B CN106735227 B CN 106735227B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/06—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of threaded articles, e.g. nuts
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Abstract
The invention belongs to the technical field of hot isostatic pressing, and particularly relates to a hot isostatic pressing preparation method of a threaded element of a double-screw extruder. The method comprises the following technical characteristics: (1) designing and welding a sheath structure; (2) selecting raw material powder; (3) powder filling and sealing welding; (4) vacuum degassing; (5) hot isostatic pressing sintering densification; (6) machined into threaded elements. The threaded element prepared by the method has the advantages of uniform internal structure, oxygen content lower than 150ppm, compactness higher than 99%, high hardness, high wear resistance, excellent corrosion resistance, high-temperature oxidation resistance and the like.
Description
Technical Field
The invention belongs to the technical field of hot isostatic pressing, and particularly relates to a hot isostatic pressing preparation method of a threaded element of a double-screw extruder.
Background
With the rapid development of the plastic industry, the food industry, the pharmaceutical industry and the building material industry, the requirements of the industries on the wear resistance, the corrosion resistance and the high-temperature oxidation resistance of a threaded element of a double-screw extruder are higher and higher. At present, the domestic screw thread element is mainly manufactured by processing high-speed steel, and when the raw materials contain high-abrasion substances such as glass fiber, nylon, calcium carbonate and the like or corrosive additives, the service life of the high-speed steel screw thread element is greatly shortened, and the use requirement cannot be met. Compared with high-speed steel, the high-temperature alloy has higher hardness, more excellent wear resistance, corrosion resistance and high-temperature oxidation resistance, can effectively resist the wear of the abrasive, and has excellent corrosion resistance.
The high-temperature alloy prepared by the hot isostatic pressing method has the excellent characteristics of uniform structure, fine crystal grains, low oxygen content, high density and the like, and currently, no research report on high-temperature alloy threaded elements exists in China.
Disclosure of Invention
The invention aims to provide a hot isostatic pressing preparation method of a threaded element of a double-screw extruder, which solves the problem of insufficient service performance of the traditional threaded element, improves the wear resistance, corrosion resistance and high-temperature oxidation resistance of the threaded element, and prolongs the service life of the threaded element.
In order to realize the purpose, the invention adopts the technical scheme that:
a hot isostatic pressing preparation method of a double-screw extruder threaded element is applied to the preparation of a high-temperature alloy threaded element:
(1) structural design and welding of sheath
The sheath structure comprises a sheath upper cover, an air duct, a sheath inner core, an outer sheath and a sheath bottom cover; welding the sheath in an argon arc welding mode;
(2) raw material powder selection
Selecting high-temperature alloy powder with oxygen content less than 150ppm and granularity interval of 100-300 meshes, wherein the sintering activity and the fluidity of the high-temperature alloy powder are selected according to the process requirement;
(3) powder filling and sealing
Wiping the sheath before powder filling, controlling the powder filling density in the powder filling process, sealing and welding the sheath after powder filling is finished, and ensuring that the strength of a welding seam area in the hot isostatic pressing process meets the process requirement by adopting a fusion welding and welding adding mode;
(4) vacuum degassing
Vacuum degassing of the sheath is carried out in a heating furnace, heating is carried out during degassing, degassing temperature is 300-500 ℃, and final vacuum degree is less than or equal to 2 multiplied by 10-3Pa, and the heat preservation time is 6 hours;
vacuum degassing is finished through the gas guide tube, and the gas guide tube is sealed and welded after the vacuum degassing is finished;
(5) hot isostatic pressing sintering densification
Placing the sheath subjected to vacuum degassing into a hot isostatic pressing furnace for sintering densification;
(6) machined into threaded elements
And machining the finished hot isostatic pressing densified sheath, removing the outer sheath, the gas guide pipe, the sheath upper cover and the sheath bottom cover, and obtaining the threaded element with the set size by wire cutting and grinding.
Further, in the hot isostatic pressing method for manufacturing the threaded element of the twin-screw extruder, as described above, the size of each part in the sheath is determined according to the shape and size of the threaded element product, the powder loading density of the high-temperature alloy powder and the shrinkage rate.
Further, according to the hot isostatic pressing preparation method of the threaded element of the double-screw extruder, the inner core of the sheath is made of medium carbon steel, and the upper cover of the sheath, the inner core of the sheath, the outer sheath and the bottom cover of the sheath are made of mild steel.
Further, according to the hot isostatic pressing preparation method of the threaded element of the twin-screw extruder, the upper end and the lower end of the sheath inner core are respectively machined with a groove with the length of 8mm, and the wall thickness of the groove is 2 mm.
Further, in the hot isostatic pressing preparation method of the threaded element of the twin-screw extruder, in the step (3) of powder filling and sealing, before powder filling, the sheath is wiped by one of acetone and alcohol, so that dust, oil stains and sweat stains on the surface of the sheath are removed.
Further, in the hot isostatic pressing preparation method of the threaded element of the twin-screw extruder, in the step (3) of powder filling and sealing, the control of the powder filling density in the powder filling process specifically comprises the following steps: the powder filling density is improved to more than 60 percent by knocking the outer sheath.
Further, according to the hot isostatic pressing preparation method of the threaded element of the twin-screw extruder, in the step (5) of hot isostatic pressing sintering densification, the hot isostatic pressing process is carried out at the temperature of 1000 ℃, the pressure of 120MPa and the holding time of 5 h.
The technical scheme of the invention has the beneficial effects that:
the hot isostatic pressing method for preparing the high-temperature alloy threaded element is the first example of the selection of the material of the threaded element and is an innovation of the forming technology of the threaded element, and compared with the traditional threaded element, the method provided by the invention has the advantages that the service life of the threaded element is greatly prolonged, and the market prospect is wide. The threaded element prepared by the method has the advantages of uniform internal structure, oxygen content lower than 150ppm, compactness higher than 99%, high hardness, high wear resistance, excellent corrosion resistance, high-temperature oxidation resistance and the like, is stable and reliable in quality, and has the service life prolonged by 3-5 times compared with that of a traditional threaded element.
Drawings
FIG. 1 is a schematic diagram of a sheath structure in a hot isostatic pressing method for preparing a threaded element of a twin-screw extruder;
FIG. 2 is a flow chart of a hot isostatic pressing method for preparing a threaded element of a twin-screw extruder.
In the figure: 1 upper and lower frame, 2 snake-shaped frame, 3 support frame, 4 side block frame, 5 strips.
Detailed Description
The technical solution of the present invention is further explained in detail by the accompanying drawings and the specific embodiments.
The invention discloses a hot isostatic pressing preparation method of a threaded element of a double-screw extruder, which takes the manufacture of the threaded element of the hot isostatic pressing double-screw extruder with the dimensions of phi 65 multiplied by phi 37 multiplied by 56mm as an example to illustrate the specific implementation mode of the method.
(1) Structural design and welding of sheath
As shown in fig. 1, the jacket structure comprises a jacket upper cover, an air duct, a jacket inner core, an outer jacket and a jacket bottom cover; and welding the sheath in an argon arc welding mode.
The size of each part in the sheath is determined according to the shape and size of the threaded element product, the powder loading density of the high-temperature alloy powder and the shrinkage rate.
In order to ensure that the sheath inner core has good comprehensive mechanical properties, the sheath inner core is made of medium carbon steel, in order to prevent the sheath from being pulled and cracked due to different shrinkage of the sheath inner core and the sheath in the hot isostatic pressing process, the upper end head and the lower end head of the sheath inner core are respectively lathed with grooves with the length of 8mm, the wall thickness of each groove is 2mm, and the upper end cover, the lower end cover and the sheath are made of soft steel materials in consideration of comprehensive material cost and welding properties. And welding the sheath in an argon arc welding mode.
(2) Raw material powder selection
The high-temperature alloy powder with the oxygen content less than 150ppm and the granularity interval of 100-300 meshes is selected, so that the powder has high sintering activity and good fluidity. The sintering activity and the flowability of the superalloy powder are selected according to the process requirements.
(3) Powder filling and sealing
Before powder loading, wiping the sheath with acetone or alcohol to remove dust, oil stain and sweat stain on the surface of the sheath and ensure that the powder is not polluted, knocking the outer wall of the sheath in the powder loading process to improve the powder loading density to more than 60%, sealing and welding the sheath after powder loading is finished, and ensuring that a welding seam area has enough strength in the hot isostatic pressing process by adopting a fusion welding and welding manner.
(4) Vacuum degassing
Vacuum degassing of the sheath is carried out in a heating furnace, heating is carried out during degassing, degassing temperature is 300-500 ℃, and final vacuum degree is less than or equal to 2 multiplied by 10-3Pa, keeping the temperature for 6 hours, finishing vacuum degassing through the gas guide tube, and sealing and welding the gas guide tube after the vacuum degassing is finished.
(5) Hot isostatic pressing sintering densification
And placing the sheath subjected to vacuum degassing into a hot isostatic pressing furnace for sintering densification. The hot isostatic pressing process in the embodiment is carried out at the temperature of 1000 ℃, the pressure of 120MPa and the heat preservation time of 5 h.
(6) Machined into threaded elements
The finished hot isostatic compacted capsule was machined, the outer capsule, the degassing conduit, the capsule end cap were removed, wire cut to 56mm length, and threaded elements of dimensions phi 65 x phi 37 x 56mm were obtained by grinding.
The threaded element prepared by the method has the advantages of uniform internal structure, oxygen content lower than 150ppm, compactness higher than 99%, high hardness, high wear resistance, excellent corrosion resistance, high-temperature oxidation resistance and the like, is stable and reliable in quality, and has the service life prolonged by 3-5 times compared with that of a traditional threaded element.
Claims (4)
1. A hot isostatic pressing preparation method of a double-screw extruder threaded element is applied to the preparation of a high-temperature alloy threaded element, and is characterized in that:
(1) structural design and welding of sheath
The sheath structure comprises a sheath upper cover, an air duct, a sheath inner core, an outer sheath and a sheath bottom cover; welding the sheath in an argon arc welding mode;
the upper end and the lower end of the sheath inner core respectively penetrate through the through holes in the central positions of the sheath upper cover and the sheath bottom cover and are welded and fixed with the through holes;
(2) raw material powder selection
Selecting high-temperature alloy powder with oxygen content less than 150ppm and granularity interval of 100-300 meshes, wherein the sintering activity and the fluidity of the high-temperature alloy powder are selected according to the process requirement;
(3) powder filling and sealing
Wiping the sheath before powder filling, controlling the powder filling density in the powder filling process, sealing and welding the sheath after powder filling is finished, and ensuring that the strength of a welding seam area in the hot isostatic pressing process meets the process requirement by adopting a fusion welding and welding adding mode;
(4) vacuum degassing
Vacuum degassing of the sheath is carried out in a heating furnace, heating is carried out during degassing, degassing temperature is 300-500 ℃, and final vacuum degree is less than or equal to 2 multiplied by 10-3Pa, and the heat preservation time is 6 hours;
vacuum degassing is finished through the gas guide tube, and the gas guide tube is sealed and welded after the vacuum degassing is finished;
(5) hot isostatic pressing sintering densification
Placing the sheath subjected to vacuum degassing into a hot isostatic pressing furnace for sintering densification;
(6) machined into threaded elements
Machining the finished hot isostatic pressing densified sheath, removing the outer sheath, the gas guide tube, the sheath upper cover and the sheath bottom cover, and obtaining a threaded element with a set size by wire cutting and grinding;
the size of each part in the sheath is determined according to the shape and size of the threaded element product, the powder filling density of the high-temperature alloy powder and the shrinkage rate;
the sheath inner core is made of medium carbon steel, and the sheath upper cover, the sheath outer cover and the sheath bottom cover are made of mild steel;
the upper end and the lower end of the sheath inner core are respectively lathed with a groove with the length of 8mm, and the wall thickness of the groove is 2 mm.
2. A method for hot isostatic pressing of threaded elements of twin-screw extruders according to claim 1, characterised in that: and (3) in the powder filling and sealing welding, wiping the sheath with one of acetone and alcohol before powder filling, and removing dust, oil stains and sweat stains on the surface of the sheath.
3. A method for hot isostatic pressing of threaded elements of twin-screw extruders according to claim 1, characterised in that: in the step (3) of powder filling and sealing welding, the control of the powder filling density in the powder filling process specifically comprises the following steps: the powder filling density is improved to more than 60 percent by knocking the outer sheath.
4. A method for hot isostatic pressing of threaded elements of twin-screw extruders according to claim 1, characterised in that: in the hot isostatic pressing sintering densification in the step (5), the hot isostatic pressing process is carried out at the temperature of 1000 ℃, the pressure of 120MPa and the heat preservation time of 5 h.
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| CN108284228A (en) * | 2018-01-29 | 2018-07-17 | 北京汇越新材料科技有限公司 | It is a kind of based on the double screw extruder of the heat and other static pressuring processes preparation method of compound whole bushing |
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| CN112893843A (en) * | 2021-01-15 | 2021-06-04 | 中国矿业大学 | Preparation method of MoNiB metal ceramic threaded element |
| CN112916855A (en) * | 2021-01-25 | 2021-06-08 | 北京航空航天大学 | Hot isostatic pressing accurate forming method for complex thin-wall rib structure |
| CN113005318B (en) * | 2021-02-25 | 2022-05-24 | 航天材料及工艺研究所 | Powder titanium-aluminum alloy step-by-step hot isostatic pressing preparation method |
| CN116024484A (en) * | 2023-01-09 | 2023-04-28 | 天津际航新材料有限公司 | Preparation method of high-hardness high-thermal-conductivity iron-copper alloy |
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| JPH04371820A (en) * | 1991-06-20 | 1992-12-24 | Hitachi Metals Ltd | Injection or extrusion molding machine |
| JPH07188711A (en) * | 1993-12-27 | 1995-07-25 | Nippon Koshuha Kogyo Kk | Production of screw for extruding and molding plastic |
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