CN112658264A - Powder metallurgy double-drive hub and production process thereof - Google Patents
Powder metallurgy double-drive hub and production process thereof Download PDFInfo
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- CN112658264A CN112658264A CN202011471731.6A CN202011471731A CN112658264A CN 112658264 A CN112658264 A CN 112658264A CN 202011471731 A CN202011471731 A CN 202011471731A CN 112658264 A CN112658264 A CN 112658264A
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Abstract
The invention discloses a powder metallurgy double-drive hub and a production process thereof, wherein the double-drive hub is prepared from the following raw materials in percentage by mass: 1.8 to 2.23 percent of Cu, 0.54 to 0.66 percent of C and the balance of Fe. The hub produced by the production process can meet the requirement of the commercial vehicle on the dimensional accuracy of the dual-drive hub; compared with the traditional forging process, the method saves the cost by about 40 percent, improves the material utilization rate, reduces the product weight and meets the development requirement of light weight of automobiles. Therefore, the dual-drive hub prepared by the production process has higher performance.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a powder metallurgy dual-drive hub and a production process thereof.
Background
The existing double-drive hubs are machined by castings, and due to the structure of the double-drive hubs, the machining turning allowance of the castings is very large, the machining cost is very high, and the waste of materials is very serious; the existing powder metallurgy process can form the dual-drive hub through one-time molding, but only machines the position with extremely high precision of the inner diameter and the outer diameter, so that the processing quality of the dual-drive hub cannot be ensured.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a powder metallurgy double-drive hub and a production process thereof, wherein a special die structure is designed by adopting the powder metallurgy process; meanwhile, additional machining is reduced, the material utilization rate is greatly improved, the product weight is reduced, and the cost is greatly saved.
In order to achieve the purpose, the invention provides the following technical scheme:
a powder metallurgy double-drive hub is prepared from the following raw materials in percentage by mass: 1.8 to 2.23 percent of Cu, 0.54 to 0.66 percent of C and the balance of Fe; the Cu is mixed in a Distaloy ACu mode, namely the Cu is added in the process of manufacturing the Fe powder, so that the performance of the powder is more stable, the size change among different products is small, and the control of the product size is facilitated. Further, the powder metallurgy double-drive hub is prepared from the following raw materials in percentage by mass: 1.88 to 2.15 percent of Cu, 0.58 to 0.62 percent of C and the balance of Fe.
The production process of the dual-drive hub comprises the following steps:
(1) mixed powder
According to the raw material proportion, the raw materials are subjected to powder mixing treatment by adopting a specific process, so that the powder metallurgy forming pressing requirement is met; segregation, agglomeration, explosion and the like cannot be generated among the powder in the powder mixing process;
(2) shaping of
A 250T Yueyun forming press is adopted, and the structure of the die is two at the top and two at the bottom; the die is designed with special positioning to ensure the precision requirement of the product; meanwhile, the deformation of the product is strictly controlled in the forming process; products cannot be collided and extruded in the process of procedure transportation;
(3) sintering
The temperature of the high-temperature sintering section is 1120 ℃, and the high-temperature sintering section is required to be sintered for more than 20 minutes to meet the product performance; meanwhile, a graphite plate is used as a support in the sintering process, and the large surface of the product is placed on the graphite plate; the product must be placed and sintered in a specific direction, so that the deformation of the product can be reduced to the greatest extent; blowing furnace dust by using an air gun to the sintered product and then immediately machining; the process is not soaked in anti-rust oil;
(4) one-time machining
The size of the outer diameter of 120.5 is selected as a positioning reference in machining, so that the positioning error can be reduced to the greatest extent; machining the main turning inner diameter and outer diameter; the concentricity of the inner diameter and the outer diameter is ensured to be within 0.15 in the turning process; reserving a certain allowance for the inner diameter, and performing finish machining after heat treatment;
(5) thermal treatment
The heat treatment adopts a box-type heat treatment furnace, the bottom surface of a heat treatment tool is required to be flat and cannot be warped, and meanwhile, the heat treatment adopts high-temperature oil, so that the cooling speed is slow, and the deformation control of a product is facilitated; after heat treatment, measuring the micro hardness of the infiltrated layer of the furnace steel piece and the surface of the product, and strictly controlling the heat treatment process; meanwhile, after heat treatment, the deformation of the product is measured by sampling inspection;
(6) secondary machining:
the machining still selects the size of the outer diameter 120.5 as a positioning reference, and after the positioning tool requirement and the clearance control of the size of the outer diameter 120.5 are controlled to be 0.1, the sizes of the inner diameter 106.59 and the outer diameter 127.25 are finely turned; the special positioning tool for the working procedure is a key, and all position degree requirements of a drawing must be met after secondary machining;
(7) cleaning of
The working procedure mainly comprises the steps of cleaning iron and dirt on a product processed by a machine;
(8) oil injection
CRC 336-thin type rust-preventive oil is adopted, and the rust-preventive effect of the oil product is at least more than 6 months;
(9) package (I)
The special packaging mode is adopted, products are separated by using a partition plate, anti-rust paper and the partition plate are added between the upper layer and the lower layer of the products, 4 products are placed on each layer, and 24 products with 6 layers are placed on each packaging box; 2 bags of special drying agent are placed in the packaging box; then sealing with special VCI antirust bag, and tightening with rolling band.
Further, the heat treatment process of the step (5) is as follows: the heat treatment time is 5 hours, the carburizing temperature is 880 ℃, the carbon formula is 1.2/0.9/0.8, the quenching temperature is 830 ℃, the tempering temperature is 170 ℃, and the time is 120 minutes.
Has the advantages that: the invention provides a powder metallurgy dual-drive hub and a production process thereof, and compared with the prior art, the invention has the following advantages:
1. the hub produced by the production process can meet the requirement of the commercial vehicle on the dimensional accuracy of the dual-drive hub;
2. the hub produced by the production process saves about 40% of cost compared with the traditional forging process, improves the material utilization rate, reduces the product weight and meets the development requirement of light weight of automobiles.
Therefore, the dual-drive hub prepared by the production process has higher performance.
Drawings
FIG. 1 is a sintering drawing of a large key slot in different directions.
Detailed Description
The present invention is further described below with reference to specific examples, which are only exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1
Adopts a special material formula of 6HP-306, 1.8-2.23% of Cu, 0.54-0.66% of C and the balance of Fe.
Wherein the powder mixing mode of Cu is DistaloyACu form;
if the same composition ratio of 6HP-237 powder is adopted: 1.8 to 2.23 percent of Cu, 0.54 to 0.66 percent of C and the balance of Fe. However, Cu is prepared by a conventional powder mixing mode, namely Fe, Cu and C are mixed together; outer diameter during production of similar dual drive hubs
120.65-120.90 can be out of tolerance in size, the roundness is very large, and the fluctuation among products is very large and exceeds the specification of a drawing; the size out-of-tolerance also affects the positioning of subsequent machining products, and has great influence on the precision of products.
Example 2
The graphite plates are used for placement in the sintering process, the transverse sintering data (type A in figure 1) of the large key groove is better than the vertical sintering data (type B in figure 1) of the large key groove, the upper and lower conicity of the product is smaller, and the control of the size of the product is facilitated;
example 3
The position degree of 0.8 in the product drawing is very easy to be out of tolerance, the molding is carried out, and the position degree of the sintering process reaches 0.55 MAX; the subsequent machining and heat treatment adopt a special positioning mode, the outer diameter is 120.5 for positioning, a special tool is designed, and the position degree is greatly optimized in the subsequent machining and heat treatment procedures.
Claims (4)
1. The powder metallurgy double-drive hub is characterized by being prepared from the following raw materials in percentage by mass: 1.8 to 2.23 percent of Cu, 0.54 to 0.66 percent of C and the balance of Fe; wherein Cu is mixed by adopting a Distaloy ACu mode, namely Cu is added in the process of manufacturing Fe powder.
2. The powder metallurgy dual drive hub according to claim 1, is prepared from the following raw materials in percentage by mass: 1.88 to 2.15 percent of Cu, 0.58 to 0.62 percent of C and the balance of Fe.
3. A process for the production of a dual-drive hub according to claim 1 or 2, comprising the steps of:
(1) mixed powder
According to the raw material proportion, the raw materials are subjected to powder mixing treatment by adopting a specific process, so that the powder metallurgy forming pressing requirement is met; segregation, agglomeration, explosion and the like cannot be generated among the powder in the powder mixing process;
(2) shaping of
A 250T Yueyun forming press is adopted, and the structure of the die is two at the top and two at the bottom; the die is designed with special positioning to ensure the precision requirement of the product; meanwhile, the deformation of the product is strictly controlled in the forming process; products cannot be collided and extruded in the process of procedure transportation;
(3) sintering
The temperature of the high-temperature sintering section is 1120 ℃, and the high-temperature sintering section is required to be sintered for more than 20 minutes to meet the product performance; meanwhile, a graphite plate is used as a support in the sintering process, and the large surface of the product is placed on the graphite plate; the product must be placed and sintered in a specific direction, so that the deformation of the product can be reduced to the greatest extent; blowing furnace dust by using an air gun to the sintered product and then immediately machining; the process is not soaked in anti-rust oil;
(4) one-time machining
The size of the outer diameter of 120.5 is selected as a positioning reference in machining, so that the positioning error can be reduced to the greatest extent; machining the main turning inner diameter and outer diameter; the concentricity of the inner diameter and the outer diameter is ensured to be within 0.15 in the turning process; reserving a certain allowance for the inner diameter, and performing finish machining after heat treatment;
(5) thermal treatment
The heat treatment adopts a box-type heat treatment furnace, the bottom surface of a heat treatment tool is required to be flat and cannot be warped, and meanwhile, the heat treatment adopts high-temperature oil, so that the cooling speed is slow, and the deformation control of a product is facilitated; after heat treatment, measuring the micro hardness of the infiltrated layer of the furnace steel piece and the surface of the product, and strictly controlling the heat treatment process; meanwhile, after heat treatment, the deformation of the product is measured by sampling inspection;
(6) secondary machining
The machining still selects the size of the outer diameter 120.5 as a positioning reference, and after the positioning tool requirement and the clearance control of the size of the outer diameter 120.5 are controlled to be 0.1, the sizes of the inner diameter 106.59 and the outer diameter 127.25 are finely turned; the special positioning tool for the working procedure is a key, and all position degree requirements of a drawing must be met after secondary machining;
(7) cleaning of
The working procedure mainly comprises the steps of cleaning iron and dirt on a product processed by a machine;
(8) oil injection
CRC 336-thin type rust-preventive oil is adopted, and the rust-preventive effect of the oil product is at least more than 6 months;
(9) package (I)
The special packaging mode is adopted, products are separated by using a partition plate, anti-rust paper and the partition plate are added between the upper layer and the lower layer of the products, 4 products are placed on each layer, and 24 products with 6 layers are placed on each packaging box; 2 bags of special drying agent are placed in the packaging box; then sealing with special VCI antirust bag, and tightening with rolling band.
4. The production process according to claim 3, wherein the heat treatment process of the step (5) is as follows: the heat treatment time is 5 hours, the carburizing temperature is 880 ℃, the carbon formula is 1.2/0.9/0.8, the quenching temperature is 830 ℃, the tempering temperature is 170 ℃, and the time is 120 minutes.
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| CN202011471731.6A CN112658264A (en) | 2020-12-14 | 2020-12-14 | Powder metallurgy double-drive hub and production process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333740A (en) * | 2021-06-17 | 2021-09-03 | 德钜（厦门）特种合金制品有限公司 | Powder metallurgy formula and preparation method of high-power commercial vehicle water pump hub |
| CN115283678A (en) * | 2022-07-22 | 2022-11-04 | 德莱赛稳加油设备(上海)有限公司 | Manufacturing method of secondary oil gas recovery pump impeller of gas station |
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2020
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| CN101733403A (en) * | 2009-12-11 | 2010-06-16 | 山东呈瑞粉末冶金有限公司 | Process for manufacturing main drive inner core of gasoline economizer for motorcycle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113333740A (en) * | 2021-06-17 | 2021-09-03 | 德钜（厦门）特种合金制品有限公司 | Powder metallurgy formula and preparation method of high-power commercial vehicle water pump hub |
| CN115283678A (en) * | 2022-07-22 | 2022-11-04 | 德莱赛稳加油设备(上海)有限公司 | Manufacturing method of secondary oil gas recovery pump impeller of gas station |
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