CN115158997B - Double-metal liquid composite casting spiral auger and manufacturing method thereof - Google Patents
Double-metal liquid composite casting spiral auger and manufacturing method thereof Download PDFInfo
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- CN115158997B CN115158997B CN202210834852.5A CN202210834852A CN115158997B CN 115158997 B CN115158997 B CN 115158997B CN 202210834852 A CN202210834852 A CN 202210834852A CN 115158997 B CN115158997 B CN 115158997B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
- B65G33/26—Screws
- B65G33/265—Screws with a continuous helical surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G33/00—Screw or rotary spiral conveyors
- B65G33/24—Details
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
Abstract
The application provides a bimetal liquid composite casting spiral auger and a manufacturing method thereof, and relates to the technical field of spiral auger processing. The spiral auger body comprises a mounting part, a pushing section and a compression section, wherein the mounting part is positioned at the end part of the pushing section, and the pushing section is fixedly connected with the compression section. According to the characteristics of the spiral auger, the spiral auger is divided into a pushing section and a compression section, the pushing section has small material extrusion force and low abrasion, and carbon steel or low alloy steel is adopted; the compression section has large material extrusion force, and the abrasion block is formed by composite casting of high-chromium cast iron and carbon steel or low-alloy steel; the installation part is arranged on the propulsion section, and because of adopting carbon steel or low alloy steel, the part is easy to process, safe and firm to install, and difficult to loose, crack and other problems; the application draws the advantages of carbon steel and high-chromium cast iron by combining the bimetal liquid and the bimetal liquid, ensures the safety and firmness of the installation part of the spiral auger, and ensures the wear resistance of the compression section part to be durable.
Description
Technical Field
The application relates to the technical field of spiral auger processing, in particular to a bimetal liquid composite casting spiral auger and a manufacturing method thereof.
Background
The spiral auger is an important component of a material pushing and feeding system and is widely applied to the fields of mines, brick machines, woodworking machinery and the like. Screw augers mainly made of 3 types of materials in the market at present:
carbon steel or low alloy steel: the spiral auger material has the advantages of good toughness, low cost, easy manufacture, safe and firm end installation part, difficult occurrence of loosening and cracking of an installation screw hole and the like. However, the spiral auger is welded or cast, the wear-resistant welding rod is required to be additionally welded, the spiral auger has short service life, and the wear-resistant welding rod is required to be assembled and disassembled after later use and wear.
Stainless steel material: the spiral auger has high material cost and wear resistance slightly superior to that of a carbon steel spiral auger, but the service life of the spiral auger is still not satisfied with the needs of customers.
High chromium cast iron material: the spiral auger material has moderate cost, high hardness and good wear resistance, and is obviously superior to the two materials. However, the high-chromium cast iron material has high hardness and high brittleness, is difficult to process, is easy to loosen, crack and the like at the installation position of the end part, often causes the screw auger to be worn down, the whole screw auger part is scrapped, and the use cost of customers is high.
Accordingly, in order to solve the above-mentioned problems of the prior art, it is necessary to provide a bimetal liquid composite casting screw auger and a manufacturing method thereof.
Disclosure of Invention
The application aims to provide a bimetal liquid composite casting spiral auger and a manufacturing method thereof, which can provide a solution for overcoming the defects in the prior art, have the advantages of drawing carbon steel and high-chromium cast iron, and ensure the safety and firmness of the installation part of the spiral auger, the wear resistance of the compression section part and the like through bimetal liquid composite.
The embodiment of the application provides a bimetal liquid composite casting spiral auger, which comprises a spiral auger body, wherein the spiral auger body comprises a mounting part, a pushing section and a compression section, the mounting part is positioned at the end part of the pushing section, and the pushing section is fixedly connected with the compression section.
In some embodiments of the application, the propulsion section is cast from carbon steel or low alloy steel and the compression section is cast from high chromium cast iron in combination with carbon steel or low alloy steel.
The embodiment of the application also provides a manufacturing method of the bimetal liquid composite casting spiral auger, which comprises the following steps:
manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam model in a sand box for vacuumizing and shaping; the lost foam model comprises a pushing section model and a compression section model;
respectively calculating the weight of the molten steel in the pushing section and the weight of the molten steel in the compression section according to the size requirement and the shape requirement of the spiral auger; wherein the propelling section molten steel adopts carbon steel molten steel or low alloy molten steel, and the compression section molten steel adopts high chromium cast iron molten steel; the molten steel comprises two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel;
pouring the carbon steel liquid or the low alloy steel liquid into a propelling section model from a casting head through a stepped pouring gate to obtain a propelling section; pouring the two molten steels of the carbon steel liquid or the low alloy steel liquid and the high chromium cast iron liquid into a compression section model from a casting head sequentially through a stepped pouring gate to obtain a compression section; wherein the compression section comprises a carbon steel or low alloy steel portion and a high chromium cast iron portion;
and (5) carrying out a heat treatment process on the formed spiral auger after cooling and forming.
In some embodiments of the application, the propulsion section model and the compression section model are monolithic models;
or, the propulsion section model and the compression section model are two independent models.
In some embodiments of the present application, the step of performing a heat treatment process on the molded spiral auger after the cooling molding includes:
when the pushing section model and the compression section model are integral models, annealing, quenching and tempering are sequentially carried out on the formed spiral auger;
when the pushing section model and the compression section model are two independent models, respectively annealing the formed pushing section and compression section;
quenching and tempering the high-chromium cast iron part of the compression section in sequence;
and fixedly connecting the pushing section and the compression section after heat treatment to form a spiral auger integral section.
In some embodiments of the present application, when the pushing section model and the compression section model are integral models, the steps of annealing, quenching and tempering the formed spiral auger sequentially include:
and (3) sequentially annealing the formed spiral auger, placing the annealed spiral auger on a machine tool for coaxiality correction and straightening, and sequentially quenching and tempering the corrected spiral auger.
In some embodiments of the present application, the step of fixedly connecting the thermally treated advancing section and the compressing section to form a screw auger integral section comprises:
placing the propulsion section after heat treatment on a machine tool to process a connecting hole;
placing the compression section after heat treatment on a machine tool to process a connecting pin, wherein the connecting pin is matched with the connecting hole; wherein the connecting pin is located in the carbon steel or low alloy steel portion of the compression section;
and butting the pushing section with the compression section, and fixing the pushing section and the compression section through welding to form the whole spiral auger section.
In some embodiments of the application, the annealing process is: heating to 880 ℃ at 110 ℃/h, preserving heat for 4h at 880 ℃, and cooling to room temperature along with the furnace.
In some embodiments of the application, the quenching treatment process is as follows: heating to 650 ℃ at 80 ℃/h, preserving heat for 3h at 650 ℃, heating to 980 ℃ at 120 ℃/h, preserving heat for 3h at 980 ℃, and finally air-cooling to room temperature.
In some embodiments of the application, the tempering treatment process is as follows: heating to 400 ℃ at 80 ℃/h, preserving heat for 4 hours at 400 ℃, and finally cooling to room temperature by air.
Compared with the prior art, the embodiment of the application has at least the following advantages or beneficial effects:
the spiral auger body comprises a mounting part, a pushing section and a compression section, wherein the mounting part is positioned at the end part of the pushing section, and the pushing section is fixedly connected with the compression section. Manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam model in a sand box for vacuumizing and shaping; the lost foam model comprises a pushing section model and a compression section model; respectively calculating the weight of the molten steel in the pushing section and the weight of the molten steel in the compression section according to the size requirement and the shape requirement of the spiral auger; wherein the propelling section molten steel adopts carbon steel molten steel or low alloy molten steel, and the compression section molten steel adopts high chromium cast iron molten steel; the molten steel comprises two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel; pouring the carbon steel liquid or the low alloy steel liquid into a propelling section model from a casting head through a stepped pouring gate to obtain a propelling section; pouring the two molten steels of the carbon steel liquid or the low alloy steel liquid and the high chromium cast iron liquid into a compression section model from a casting head sequentially through a stepped pouring gate to obtain a compression section; wherein the compression section comprises a carbon steel or low alloy steel portion and a high chromium cast iron portion; and (5) carrying out a heat treatment process on the formed spiral auger after cooling and forming. According to the characteristics of the spiral auger, the spiral auger is divided into a pushing section and a compression section, the pushing section has small material extrusion force and low abrasion, and carbon steel or low alloy steel is adopted; the compression section has large material extrusion force, and the abrasion block is formed by composite casting of high-chromium cast iron and carbon steel or low-alloy steel; the installation part is arranged on the propulsion section, and because of adopting carbon steel or low alloy steel, the part is easy to process, safe and firm to install, and difficult to loose, crack and other problems; the application draws the advantages of carbon steel and high-chromium cast iron by combining the bimetal liquid and the bimetal liquid, ensures the safety and firmness of the installation part of the spiral auger, and ensures the wear resistance of the compression section part to be durable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a double-metal liquid composite casting spiral auger according to an embodiment of the present application;
FIG. 2 is a schematic diagram showing a casting structure of a double-metal liquid composite casting spiral auger according to an embodiment of the present application;
FIG. 3 is a flow chart showing steps of a double-metal liquid composite casting spiral auger in an embodiment of the application.
Reference numerals: 1. a mounting part; 2. a propulsion section; 3. a compression section; 4. casting head; 5. pouring gate of carbon steel; 6. and (3) a high chromium runner.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present application, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the product of the present application is conventionally put when used, it is merely for convenience of describing the present application and simplifying the description, and it does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang" and the like, if any, do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present application, "plurality" means at least 2.
In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Examples
As shown in fig. 1-3, fig. 1 is a schematic structural diagram of a bimetal liquid composite casting spiral auger according to an embodiment of the present application; FIG. 2 is a schematic diagram showing a casting structure of a double-metal liquid composite casting spiral auger according to an embodiment of the present application; FIG. 3 is a flow chart showing steps of a double-metal liquid composite casting spiral auger according to an embodiment of the present application;
the embodiment of the application provides a bimetal liquid composite casting spiral auger, which comprises a spiral auger body, wherein the spiral auger body comprises a mounting part 1, a pushing section 2 and a compression section 3, the mounting part 1 is positioned at the end part of the pushing section 2, and the pushing section 2 is fixedly connected with the compression section 3.
The propelling section 2 is formed by casting carbon steel or low alloy steel, and the compression section 3 is formed by casting high-chromium cast iron and carbon steel or low alloy steel in a composite manner.
The embodiment of the application also provides a manufacturing method of the bimetal liquid composite casting spiral auger, which comprises the following steps:
s110, manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam model in a sand box for vacuumizing and shaping; the lost foam model comprises a pushing section model and a compression section model;
s120, respectively calculating the weight of molten steel in the propulsion section 2 and the weight of molten steel in the compression section 3 according to the size requirement and the shape requirement of the spiral auger; wherein the steel liquid of the propulsion section 2 adopts carbon steel liquid or low alloy steel liquid, and the steel liquid of the compression section 3 adopts high chromium cast iron liquid; the molten steel comprises two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel;
s130, pouring carbon steel liquid or low alloy steel liquid into a propulsion section model from a casting head 4 through a stepped pouring gate to obtain a propulsion section 2; pouring two molten steels of carbon steel liquid or low alloy steel liquid and high chromium cast iron liquid into a compression section model from a casting head 4 through a stepped pouring gate in sequence to obtain a compression section 3; wherein the compression section 3 comprises a carbon steel or low alloy steel portion and a high chromium cast iron portion;
s140, performing heat treatment process on the formed spiral auger after cooling and forming.
According to the spiral auger disclosed by the application, the spiral auger body comprises the installation part 1, the pushing section 2 and the compression section 3, wherein the installation part 1 is positioned at the end part of the pushing section 2, and the pushing section 2 is fixedly connected with the compression section 3. Manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam model in a sand box for vacuumizing and shaping; the lost foam model comprises a pushing section model and a compression section model; respectively calculating the weight of the molten steel of the pushing section 2 and the molten steel of the compressing section 3 according to the size requirement and the shape requirement of the spiral auger; wherein the steel liquid of the propulsion section 2 adopts carbon steel liquid or low alloy steel liquid, and the steel liquid of the compression section 3 adopts high chromium cast iron liquid; the molten steel comprises two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel; pouring carbon steel liquid or low alloy steel liquid into the propelling section model from the casting head 4 through a stepped pouring gate to obtain a propelling section 2; pouring two molten steels of carbon steel liquid or low alloy steel liquid and high chromium cast iron liquid into a compression section model from a casting head 4 through a stepped pouring gate in sequence to obtain a compression section 3; wherein the compression section 3 comprises a carbon steel or low alloy steel portion and a high chromium cast iron portion; and (5) carrying out a heat treatment process on the formed spiral auger after cooling and forming. According to the characteristics of the spiral auger, the spiral auger is divided into a pushing section 2 and a compression section 3, the pushing section 2 has small material extrusion force and low abrasion, and carbon steel or low alloy steel is adopted; the compression section 3 has large material extrusion force and the abrasion block is formed by adopting high-chromium cast iron and carbon steel or low-alloy steel through composite casting; the mounting part 1 is positioned on the propulsion section 2, and is easy to process due to the adoption of carbon steel or low alloy steel, and the mounting part is safe and firm and is not easy to loose, crack and other problems; the application draws the advantages of carbon steel and high-chromium cast iron by the liquid-liquid combination of the double metals, ensures the safety and firmness of the 1-position of the screw auger installation part, and ensures the wear resistance of the 3-part of the compression section to be durable.
Next, a bimetal liquid composite casting screw auger and a manufacturing method thereof in the present exemplary embodiment will be further described.
In one embodiment of the present application, step S110 "manufacturing a lost foam pattern of a spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam pattern in a sand box for vacuum forming may be further described in conjunction with the following description; the lost foam model comprises a specific process of a pushing section model and a compression section model.
And manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, wherein the lost foam model is a polystyrene foam model, coating a refractory material layer outside the lost foam model, drying, placing the lost foam model in a sand box for vibration molding, and vacuumizing for shaping. The lost foam casting is a new process of near-no-allowance and accurate molding, and the process does not need to take out a mold, a parting surface and a sand core, so that the casting does not have flash, burrs and draft angles, and the dimensional error caused by core combination is reduced.
The lost foam model comprises a pushing section model and a compression section model; in the embodiment of the application, two modes are adopted for casting;
as an example, the above-described propulsion section model and compression section model are integral models, and integral casting is performed.
As an example, the above-described propulsion section model and compression section model are two independent models, and the two independent models are cast separately. By adopting the independent casting method, the length of the casting can be reduced, the processing is convenient, the bending deformation of the spiral auger in the length direction caused by heat treatment is reduced, and the product quality of the spiral auger is improved.
In one embodiment of the present application, as described in step S120, "the weights of the molten steel in the propulsion section 2 and the molten steel in the compression section 3 are calculated according to the size requirement and the shape requirement of the spiral auger; wherein the steel liquid of the propulsion section 2 adopts carbon steel liquid or low alloy steel liquid, and the steel liquid of the compression section 3 adopts high chromium cast iron liquid; including two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel.
The spiral auger is divided into a pushing section 2 and a compressing section 3 according to the characteristics of the spiral auger, and the pushing section 2 has small material extrusion force and low abrasion, so that carbon steel or low alloy steel is adopted; the compression section 3 has large material extrusion force and abrasion blocks, so high-chromium cast iron is adopted; the installation part 1 is positioned on the propulsion section 2, and because of adopting carbon steel or low alloy steel, the part is easy to process, safe and firm to install, difficult to loose, crack and other problems, and the compression section 3 adopts high-chromium cast iron, so that the compression section has high hardness, high wear resistance and durability.
In one embodiment of the present application, step S130 "pouring the carbon steel liquid or the low alloy steel liquid from the casting head 4 into the propulsion section model through the stepped runner to obtain the propulsion section 2; pouring two molten steels of carbon steel liquid or low alloy steel liquid and high chromium cast iron liquid into a compression section model from a casting head 4 through a stepped pouring gate in sequence to obtain a compression section 3; wherein the compression section 3 comprises a concrete process of carbon steel or low alloy steel part and high chromium cast iron part ".
When the propulsion section model and the compression section model are integrated models, casting carbon steel or low alloy steel at first, casting the carbon steel or low alloy steel from the casting head 4 into the propulsion section model through the carbon steel pouring gate 5, and casting the carbon steel or low alloy steel from the casting head 4 into the carbon steel or low alloy steel part of the compression section model through the carbon steel pouring gate 5 to obtain a propulsion section 2 and the carbon steel or low alloy steel part of the compression section 3; and casting high-chromium cast iron, and casting high-chromium cast iron molten steel into the compression section model through the high-chromium pouring gate 6 from the casting head 4 to obtain a high-chromium cast iron compression section 3, and finally obtaining the whole section of spiral auger. The two metals are combined in liquid state, and the advantages of carbon steel and high-chromium cast iron are extracted.
When the pushing section model and the compression section model are two independent models, the pushing section model is independently cast, and carbon steel liquid or low alloy steel liquid is poured into the pushing section model from a casting head 4 through a carbon steel pouring gate 5 to obtain a pushing section 2; intercepting part of the upper part of the compression section 3 for bimetal liquid compounding, pouring the carbon steel liquid or the low alloy steel liquid from the casting head 4 into the bottom of the compression section model through the carbon steel pouring gate 5, obtaining the carbon steel or the low alloy steel partial compression section 3, pouring the high chromium cast iron liquid from the casting head 4 into the upper part of the compression section model through the high chromium pouring gate 6, and obtaining the high chromium cast iron partial compression section 3.
In one embodiment of the present application, the specific process of "heat treatment process separation of the formed screw auger after cooling forming" in step S140 may be further described in connection with the following description.
When the pushing section model and the compression section model are integral models, annealing, quenching and tempering are sequentially carried out on the formed spiral auger;
in a specific implementation, firstly, the molded spiral auger is cleaned and polished to remove burrs, so that the subsequent heat treatment is facilitated; and then sequentially carrying out annealing treatment on the molded spiral auger, wherein the annealing treatment process comprises the following steps: heating to 880 ℃ at 110 ℃/h, preserving heat for 4h at 880 ℃, and cooling to room temperature along with a furnace; the annealed spiral auger is placed on a machine tool for coaxiality correction and straightening, and the corrected spiral auger is quenched and tempered in sequence, wherein the quenching process comprises the following steps: heating to 650 ℃ at 80 ℃/h, preserving heat for 3 hours at 650 ℃, heating to 980 ℃ at 120 ℃/h, preserving heat for 3 hours at 980 ℃, and finally air-cooling to room temperature; the tempering treatment process comprises the following steps: heating to 400 ℃ at 80 ℃/h, preserving heat for 4 hours at 400 ℃, and finally cooling to room temperature by air to obtain the complete bimetal composite spiral auger.
When the pushing section model and the compression section model are two independent models, respectively annealing the formed pushing section 2 and compression section 3; quenching and tempering the high-chromium cast iron part of the compression section 3 in sequence; and fixedly connecting the propulsion section 2 and the compression section 3 after heat treatment to form a spiral auger integral section.
In a specific implementation, annealing treatment is carried out on the formed propulsion section 2, cleaning and polishing are carried out after the annealing treatment, and the polished propulsion section 2 is placed on a machine tool to process a connecting hole; annealing the formed compression section 3, cleaning and polishing after annealing, and placing the polished compression section 3 on a machine tool to process a connecting pin which is matched with the connecting hole; wherein the connecting pin is located in the carbon steel or low alloy steel part of the compression section 3; quenching and tempering the high-chromium cast iron part of the compression section 3 in sequence; and (3) butting the compression section 3 after quenching and tempering with the processed carbon steel part of the propulsion section 2, after the pin of the compression section 3 is inserted into the connecting hole of the propulsion section 2, driving the pin into the radial direction of the main shaft for reinforcement, welding the joint parts of the two sections, and then carrying out coaxiality correction and straightening on a machine tool to finally obtain the complete spiral auger.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The double-metal liquid composite casting spiral auger is characterized by comprising a spiral auger body, wherein the spiral auger body comprises a mounting part, a pushing section and a compression section, the mounting part is positioned at the end part of the pushing section, and the pushing section is fixedly connected with the compression section; the propelling section is formed by casting carbon steel or low alloy steel, and the compression section is formed by casting high-chromium cast iron and carbon steel or low alloy steel in a composite manner;
the manufacturing method of the bimetal liquid composite casting spiral auger comprises the following steps:
manufacturing a lost foam model of the spiral auger according to the size requirement and the shape requirement of the spiral auger, and placing the lost foam model in a sand box for vacuumizing and shaping; the lost foam model comprises a pushing section model and a compression section model;
respectively calculating the weight of the molten steel in the pushing section and the weight of the molten steel in the compression section according to the size requirement and the shape requirement of the spiral auger; wherein the propelling section molten steel adopts carbon steel molten steel or low alloy molten steel, and the compression section molten steel adopts high chromium cast iron molten steel; the molten steel comprises two molten steels, namely carbon steel molten steel or low alloy molten steel and high chromium cast iron molten steel;
pouring the carbon steel liquid or the low alloy steel liquid into a propelling section model from a casting head through a stepped pouring gate to obtain a propelling section; pouring the two molten steels of the carbon steel liquid or the low alloy steel liquid and the high chromium cast iron liquid into a compression section model from a casting head sequentially through a stepped pouring gate to obtain a compression section; wherein the compression section comprises a carbon steel or low alloy steel portion and a high chromium cast iron portion;
and (5) carrying out a heat treatment process on the formed spiral auger after cooling and forming.
2. The bimetal liquid composite casting spiral auger according to claim 1, wherein the pushing section model and the compression section model are integral models;
or, the propulsion section model and the compression section model are two independent models.
3. The bimetal liquid composite casting screw auger according to claim 2, wherein the step of performing a heat treatment process on the molded screw auger after cooling molding comprises:
when the pushing section model and the compression section model are integral models, annealing, quenching and tempering are sequentially carried out on the formed spiral auger;
when the pushing section model and the compression section model are two independent models, respectively annealing the formed pushing section and compression section;
quenching and tempering the high-chromium cast iron part of the compression section in sequence;
and fixedly connecting the pushing section and the compression section after heat treatment to form a spiral auger integral section.
4. The bimetal liquid composite casting spiral auger according to claim 3, wherein when the pushing section model and the compressing section model are integral models, the step of sequentially annealing, quenching and tempering the formed spiral auger comprises the steps of:
and (3) sequentially annealing the formed spiral auger, placing the annealed spiral auger on a machine tool for coaxiality correction and straightening, and sequentially quenching and tempering the corrected spiral auger.
5. A bimetal liquid composite casting screw auger according to claim 3, wherein said step of fixedly connecting said advancing section and said compressing section after heat treatment to form an integral section of the screw auger comprises:
placing the propulsion section after heat treatment on a machine tool to process a connecting hole;
placing the compression section after heat treatment on a machine tool to process a connecting pin, wherein the connecting pin is matched with the connecting hole; wherein the connecting pin is located in the carbon steel or low alloy steel portion of the compression section;
and butting the pushing section with the compression section, and fixing the pushing section and the compression section through welding to form the whole spiral auger section.
6. The bimetal liquid composite casting spiral auger according to claim 3, wherein the annealing treatment process is as follows: heating to 880 ℃ at 110 ℃/h, preserving heat for 4h at 880 ℃, and cooling to room temperature along with the furnace.
7. The bimetal liquid composite casting spiral auger according to claim 3, wherein the quenching treatment process is as follows: heating to 650 ℃ at 80 ℃/h, preserving heat for 3h at 650 ℃, heating to 980 ℃ at 120 ℃/h, preserving heat for 3h at 980 ℃, and finally air-cooling to room temperature.
8. The bimetal liquid composite casting spiral auger according to claim 3, wherein the tempering treatment process is as follows: heating to 400 ℃ at 80 ℃/h, preserving heat for 4 hours at 400 ℃, and finally cooling to room temperature by air.
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