Method for manufacturing Archimedes worm and gear by taking powder as raw material

Abstract

The invention discloses a method for manufacturing an Archimedes worm and gear with powder as a raw material. By optimizing powder selection, a forming process and a heat treatment process, batch production of the high-precision and high-performance Archimedes worm gear and worm is achieved. According to the technical scheme, a new thought and method are provided for application of the powder metallurgy technology in manufacturing of parts with complex shapes, and the problems that a traditional casting and cutting production method is high in machining difficulty, low in efficiency and poor in product consistency are solved. The method not only improves the production efficiency and the product quality, but also reduces the production cost, and has a wide application prospect.

Description

Technical Field

[0001] The present application relates to the technical field of metal manufacturing, and in particular to a method for manufacturing an Archimedean worm gear using powder as a raw material. Background Art

[0002] Archimedean worm gear transmission system (such as Figure 1 As shown in the figure, it is widely used in various mechanical equipment due to its compact structure, large transmission ratio and stable operation. Traditional manufacturing methods mainly include cutting and casting, but these methods have problems such as long production cycle, low material utilization rate and high cost.

[0003] As an advanced near-net-shape forming technology, powder metallurgy technology has the advantages of high material utilization, high production efficiency, and controllable performance, and is suitable for the manufacture of parts with complex shapes. However, the manufacture of Archimedean worm gears requires extremely high precision and surface quality, and the application of existing powder metallurgy technology in this field is not yet mature. Summary of the invention

[0004] Purpose of the invention: In view of the shortcomings in the prior art, the purpose of this application is to provide a method for manufacturing Archimedean worm gears using powder as raw material, and to achieve mass production of high-precision, high-performance Archimedean worm gears by optimizing powder selection, forming process and heat treatment process.

[0005] Technical solution: The present invention provides a method for manufacturing an Archimedean worm gear using powder as a raw material, comprising the following steps: selecting metal powder with a particle size of 3-8 μm, sieving the metal powder to remove coarse particles and impurities, and mixing the mixed powder with 7.5-9% POM at a temperature of 180-220° C. to prepare a feed;

[0006] The mixed feed is injected into a precision special mold and formed using a high-pressure molding machine with a molding pressure of 150-260MPa; the green body after molding is placed in a degreasing furnace at 100-130°C for degreasing for 12-20 hours to remove the binder; the degreasing green body is placed in a sintering furnace at 1200-1400°C for 20-30 hours, using nitrogen or argon as a protective atmosphere;

[0007] The sintered parts are turned and ground to ensure that the tooth profile accuracy and surface roughness of the worm gear meet the design requirements, and then the parts are quenched and tempered to improve the hardness and wear resistance of the parts; the parts are galvanized to improve their corrosion resistance.

[0008] Specifically, the metal powder is one of iron-based powder, copper-based powder and stainless steel powder.

[0009] More specifically, the iron-based powder includes pure iron powder, low carbon steel powder, and medium carbon steel powder; the copper-based powder includes pure copper powder, brass powder, and bronze powder; the stainless steel powder includes 304 stainless steel powder and 316 stainless steel powder, with a particle size range of 15-35 μm.

[0010] Specifically, in the quenching and tempering treatment, the quenching temperature is 850°C and the tempering temperature is 200°C.

[0011] Furthermore, metal powder with a particle size of 3-8 μm is selected, the metal powder is sieved to remove coarse particles and impurities, and the mixed powder is mixed with 8% POM at a temperature of 200° C. to prepare a feed material.

[0012] Furthermore, the mixed powder is loaded into a precision mold and formed using a high-pressure molding machine with a molding pressure of 200 MPa.

[0013] Furthermore, the green body after compression molding was placed in a degreasing furnace at 120° C. and degreased for 15 hours to remove the binder.

[0014] Furthermore, the degreased green body was placed in a sintering furnace at 1300° C. and sintered for 24 hours in a nitrogen protective atmosphere.

[0015] Beneficial effects: The present invention ensures the dimensional accuracy and surface quality of the Archimedean worm gear through precision molds and strict forming processes. The present invention improves the mechanical properties of parts, such as hardness, strength and wear resistance, by optimizing powder selection and heat treatment processes. The powder metallurgy technology described in the present invention achieves near-net shaping, reduces the subsequent machining process, and improves production efficiency.

[0016] Compared with the traditional casting and cutting method, the method of the present invention can improve the raw material utilization rate to 95%, with high material utilization rate, low production cost and suitable for large-scale batch production. The waste generated during the production process is small, which meets environmental protection requirements and the waste recovery rate reaches 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of Archimedes worm gear transmission system.

[0018] Figure 2 It is a schematic diagram of the production process of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present application is described in detail below through embodiments, but the protection scope of the present application is not limited to the embodiments.

[0020] Example 1

[0021] Select pure iron powder with a particle size of 5 μm, sieve the pure iron powder to remove coarse particles and impurities. Mix the above mixed powder with 8% POM at a temperature of 200°C to prepare feed;

[0022] The mixed feed is injected into a precision special mold and formed using a high-pressure molding machine with a molding pressure of 200MPa; the green body after molding is placed in a degreasing furnace at 120°C for 15 hours to remove the binder; the degreasing green body is placed in a sintering furnace at 1300°C for 21 hours in a nitrogen protective atmosphere;

[0023] The sintered parts are turned and ground to ensure that the tooth profile accuracy and surface roughness of the worm gear meet the design requirements. The parts are quenched at 850°C and tempered at 200°C to improve the hardness and wear resistance of the parts. The parts are galvanized to improve their corrosion resistance.

[0024] The tooth profile accuracy of the iron-based Archimedean worm gear manufactured in this embodiment reaches ISO grade 8, the surface roughness Ra≤0.8 μm, and the hardness reaches HV 200.

[0025] Example 2

[0026] Select pure iron powder with a particle size of 3 μm, sieve the pure iron powder to remove coarse particles and impurities. Mix the above mixed powder with 7.5% POM at a temperature of 180°C to prepare feed;

[0027] The mixed feed is injected into a precision special mold and formed using a high-pressure molding machine with a molding pressure of 150MPa; the green body after molding is placed in a degreasing furnace at 100°C for 10 hours to remove the binder; the degreasing green body is placed in a sintering furnace at 1200°C for 20 hours in a nitrogen protective atmosphere;

[0028] The sintered parts are turned and ground to ensure that the tooth profile accuracy and surface roughness of the worm gear meet the design requirements. The parts are quenched at 850°C and tempered at 200°C to improve the hardness and wear resistance of the parts. The parts are galvanized to improve their corrosion resistance.

[0029] Example 3

[0030] Select pure iron powder with a particle size of 8 μm, sieve the pure iron powder to remove coarse particles and impurities. Mix the above mixed powder with 9% POM at a temperature of 220°C to prepare feed;

[0031] The mixed feed is injected into a precision special mold and formed using a high-pressure molding machine with a molding pressure of 260MPa; the green body after molding is placed in a degreasing furnace at 130°C for 20 hours to remove the binder; the degreasing green body is placed in a sintering furnace at 1400°C for 30 hours in a nitrogen protective atmosphere;

[0032] The sintered parts are turned and ground to ensure that the tooth profile accuracy and surface roughness of the worm gear meet the design requirements. The parts are quenched at 850°C and tempered at 200°C to improve the hardness and wear resistance of the parts. The parts are galvanized to improve their corrosion resistance.

[0033] Example 4

[0034] Embodiment 4 is substantially the same as Embodiment 1, except that pure copper powder is used as the raw material.

[0035] Comparative Example 5

[0036] Comparative Example 5 is substantially the same as Example 1, except that 304 stainless steel powder is used as the raw material.

[0037] The above description is only a preferred embodiment of the present application and is not intended to limit the present application.

Claims

1. A method for manufacturing an Archimedean worm gear using powder as raw material, characterized in that: The steps include: Select metal powder with a particle size of 3-8 μm, sieve the metal powder to remove coarse particles and impurities, and mix the mixed powder with 7.5-9% POM at a temperature of 180-220° C. to prepare feed; The mixed feed is injected into a precision special mold and formed using a high-pressure molding machine with a molding pressure of 150-260MPa; the green body after molding is placed in a degreasing furnace at 100-130°C for degreasing for 12-20 hours to remove the binder; the degreasing green body is placed in a sintering furnace at 1200-1400°C for 20-30 hours, using nitrogen or argon as a protective atmosphere; The sintered parts are turned and ground to ensure that the tooth profile accuracy and surface roughness of the worm gear meet the design requirements, and then the parts are quenched and tempered to improve the hardness and wear resistance of the parts; the parts are galvanized to improve their corrosion resistance.

2. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The metal powder is one of iron-based powder, copper-based powder and stainless steel powder.

3. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The iron-based powder includes pure iron powder, low-carbon steel powder and medium-carbon steel powder.

4. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The copper-based powder includes pure copper powder, brass powder and bronze powder.

5. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The stainless steel powder includes 304 stainless steel powder and 316 stainless steel powder.

6. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The quenching and tempering treatments are performed at a quenching temperature of 850°C and a tempering temperature of 200°C.

7. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: Metal powder with a particle size of 3-8 μm is selected, the metal powder is sieved to remove coarse particles and impurities, and the mixed powder is mixed with 8% POM at a temperature of 200° C. to prepare a feed material.

8. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The mixed powder is loaded into a precision mold and formed using a high-pressure molding machine with a molding pressure of 200 MPa.

9. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The green body after compression molding was placed in a degreasing furnace at 120°C and degreased for 15 hours to remove the binder.

10. The method for manufacturing an Archimedean worm gear using powder as raw material according to claim 1, characterized in that: The degreased green body was placed in a sintering furnace at 1300°C and sintered for 24 hours in a nitrogen protective atmosphere.

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