Gear powder metallurgy formula and machining process thereof

Abstract

The gear powder metallurgy formula comprises the following formula components: 8 to 17 parts of graphite powder, 4 to 12 parts of carbon powder, 8 to 13 parts of copper powder, 2 to 6 parts of molybdenum powder, 3 to 9 parts of chromium powder, 5 to 9 parts of palmitic acid, 5 to 8 parts of nickel oxide, 50 to 98 parts of reduced iron powder, 1 to 5 parts of manganous sulfide, 5 to 10 parts of aluminum oxide and 0.5 to 1 part of micronized wax. The sintering furnace is heated to a certain temperature value, then the gear is pushed into the sintering furnace for combustion, the problem of inadaptation caused by direct contact of parts with high temperature is avoided, a certain amount of protective gas is filled into the sintering furnace for protection before a combustion door is closed, and during filling, the sintering furnace is heated to a certain temperature and a part taking value is achieved through control of a float flowmeter. After sintering is completed, the sintering furnace is taken out and cooled, and the sintering furnace is placed in an oil immersion device for oil immersion work, so that better anti-rust work is achieved, and the problem that the service life is affected is solved.

Description

Technical Field

[0001] The invention specifically relates to a gear powder metallurgy formula and a processing technology thereof. Background Art

[0002] Powder metallurgy is a process technology that uses metal or metal powder (or a mixture of metal powder and non-metal powder) as raw materials, and then forms and sinters them to manufacture metal materials, composite materials and various types of products. Due to the advantages of powder metallurgy technology, it has become the key to solving new material problems and plays a vital role in the development of new materials. However, most of the existing gears are made of blanks using cast iron technology and then cut. Due to the influence of various factors, defects such as pores, pinholes, slag inclusions, cracks, and pits often appear during the processing. At the same time, there are many scraps in the processing of cast iron parts, which is wasteful, costly, and has low product precision. It needs to be balanced, the process is cumbersome, and the production efficiency is low. Although a few are produced using powder metallurgy technology, due to the limitations of its formula and process, the formula is not optimized enough. Therefore, there is an urgent need for a gear powder metallurgy formula and its processing technology. Summary of the invention

[0003] Purpose of the invention: In order to solve the deficiencies of the prior art, the present invention provides a gear powder metallurgy formula and a processing technology thereof.

[0004] Technical solution: A gear powder metallurgy formula, including the following formula components: 8-17 parts of graphite powder, 4-12 parts of carbon powder, 8-13 parts of copper powder, 2-6 parts of molybdenum powder, 3-9 parts of chromium powder, 5-9 parts of palmitic acid, 5-8 parts of nickel oxide, 50-98 parts of reduced iron powder, 1-5 parts of manganous sulfide, 5-10 parts of aluminum oxide and 0.5-1 part of micro powder wax.

[0005] As an optimization: the gear powder metallurgy formula includes the following formula components: 13 parts of graphite powder, 7 parts of carbon powder, 11 parts of copper powder, 4 parts of molybdenum powder, 7 parts of chromium powder, 6 parts of palmitic acid, 7 parts of nickel oxide, 58 parts of reduced iron powder, 3 parts of manganous sulfide, 7 parts of aluminum oxide and 0.8 parts of micro powder wax.

[0006] A processing technology for a gear powder metallurgy formula comprises the following steps:

[0007] Step 1: Powder mixing: mix the powders of each component: graphite powder, carbon powder, copper powder, molybdenum powder, chromium powder, palmitic acid, nickel oxide, reduced iron powder, manganese sulfide, aluminum oxide and micronized wax evenly, and pack them into cans for later use;

[0008] Step 2: Pressing: The mixed powder in the can is fed into a press, which feeds the powder into a preset product mold and presses it into a product blank of a set shape at a pressure of 72-79 MPa for standby use;

[0009] Step 3, sintering: placing the product blank on a conveyor mesh belt, and sending the conveyor mesh belt into a sintering furnace at a set speed, at a temperature of 230°C-290°C, to sinter the product blank into a semi-finished product;

[0010] Step 4: Cooling and oil immersion: Cool the semi-finished product and immerse it in engine oil at 80℃-110℃ for 60min-85min;

[0011] Step 5: Finishing: Place the semi-finished product into the shaping mold for fine correction so that the semi-finished product reaches the required tolerance range;

[0012] Step 6: Deburring: The semi-finished product is deburred by shot peening.

[0013] Step 7, steam treatment: steam-treat the deburred semi-finished product to form a dense anti-rust layer on the surface of the semi-finished product, and then clean it to obtain a finished product.

[0014] As an optimization: the time of the sintering step is 2.5-5h; the sintering step is first preheated with electric heating, the preheating temperature is 700℃-950℃, and the sintering temperature is 750℃-1200℃; H2 and N2 are used as protective gases in the furnace of the sintering furnace.

[0015] As an optimization: the temperature of the steam treatment step is 600°C-750°C, and the treatment time is 5-6h.

[0016] Beneficial effects: In the present invention, the sintering furnace is heated to a certain temperature value, and then the gear is pushed into the sintering furnace for combustion, so as to avoid the problem of parts being inadaptable to high temperature due to direct contact with high temperature. Before closing the door for combustion, a certain amount of protective gas is filled into the sintering furnace for protection. During filling, it is controlled by a float flowmeter, and then the sintering furnace is heated to a certain temperature to take out the parts, forming a stable combustion zone, and maintained for a certain time. After sintering is completed, it is taken out for cooling, and placed in an oil immersion device for oil immersion, so as to achieve better rust prevention and avoid problems affecting the service life. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the protection scope of the present invention. The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Specific embodiment 1

[0019] A gear powder metallurgy formula comprises the following formula components: 8 parts of graphite powder, 4 parts of carbon powder, 8 parts of copper powder, 2 parts of molybdenum powder, 3 parts of chromium powder, 5 parts of palmitic acid, 5 parts of nickel oxide, 50 parts of reduced iron powder, 1 part of manganous sulfide, 5 parts of aluminum oxide and 0.5 parts of micro powder wax.

[0020] A processing technology for a gear powder metallurgy formula comprises the following steps:

[0021] Step 1: Powder mixing: mix the powders of each component: graphite powder, carbon powder, copper powder, molybdenum powder, chromium powder, palmitic acid, nickel oxide, reduced iron powder, manganese sulfide, aluminum oxide and micronized wax evenly, and pack them into cans for later use;

[0022] Step 2: Pressing: The mixed powder in the can is fed into a press, which feeds the powder into a preset product mold and presses it into a product blank of a set shape at a pressure of 72 MPa for standby use;

[0023] Step 3, sintering: placing the product blank into the conveyor mesh belt, and the conveyor mesh belt is sent into the sintering furnace at a set speed, the temperature is 230°C, and the product blank is sintered into a semi-finished product; the sintering step time is 2.5h; the sintering step is first preheated by electric heating, the preheating temperature is 700°C, and the sintering temperature is 750°C; H2 and N2 are used as protective gases in the furnace of the sintering furnace;

[0024] Step 4: Cooling and oil immersion: Cool the semi-finished product and immerse it in engine oil at 80°C for 60 minutes;

[0025] Step 5: Finishing: Place the semi-finished product into the shaping mold for fine correction so that the semi-finished product reaches the required tolerance range;

[0026] Step 6: Deburring: The semi-finished product is deburred by shot peening.

[0027] Step 7: Steam treatment: steam the deburred semi-finished product to form a dense anti-rust layer on the surface of the semi-finished product, and then clean it to obtain the finished product. The temperature of the steam treatment step is 600° C., and the treatment time is 5 hours. Specific embodiment 2

[0029] A gear powder metallurgy formula comprises the following formula components: 17 parts of graphite powder, 12 parts of carbon powder, 13 parts of copper powder, 6 parts of molybdenum powder, 9 parts of chromium powder, 9 parts of palmitic acid, 8 parts of nickel oxide, 98 parts of reduced iron powder, 5 parts of manganous sulfide, 10 parts of aluminum oxide and 1 part of micro powder wax.

[0030] A processing technology for a gear powder metallurgy formula comprises the following steps:

[0031] Step 1: Powder mixing: mix the powders of each component: graphite powder, carbon powder, copper powder, molybdenum powder, chromium powder, palmitic acid, nickel oxide, reduced iron powder, manganese sulfide, aluminum oxide and micronized wax evenly, and pack them into cans for later use;

[0032] Step 2: Pressing: The mixed powder in the can is fed into a press, which feeds the powder into a preset product mold and presses it into a product blank of a set shape at a pressure of 79 MPa for standby use;

[0033] Step 3, sintering: Place the product blank into the conveyor mesh belt, and the conveyor mesh belt is sent into the sintering furnace at a set speed, the temperature is 290°C, and the product blank is sintered into a semi-finished product; the sintering step takes 5 hours; the sintering step is first preheated with electric heating, the preheating temperature is 950°C, and the sintering temperature is 1200°C; H2 and N2 are used as protective gases in the furnace of the sintering furnace;

[0034] Step 4: Cooling and oil immersion: Cool the semi-finished product and immerse it in engine oil at 110°C for 85 minutes;

[0035] Step 5: Finishing: Place the semi-finished product into the shaping mold for fine correction so that the semi-finished product reaches the required tolerance range;

[0036] Step 6: Deburring: The semi-finished product is deburred by shot peening.

[0037] Step 7: Steam treatment: steam the deburred semi-finished product to form a dense anti-rust layer on the surface of the semi-finished product, and then clean it to obtain the finished product. The temperature of the steam treatment step is 750°C and the treatment time is 6 hours. Specific embodiment 3

[0039] A gear powder metallurgy formula comprises the following formula components: 13 parts of graphite powder, 7 parts of carbon powder, 11 parts of copper powder, 4 parts of molybdenum powder, 7 parts of chromium powder, 6 parts of palmitic acid, 7 parts of nickel oxide, 58 parts of reduced iron powder, 3 parts of manganous sulfide, 7 parts of aluminum oxide and 0.8 parts of micro powder wax.

[0040] A processing technology for a gear powder metallurgy formula comprises the following steps:

[0041] Step 1: Powder mixing: mix the powders of each component: graphite powder, carbon powder, copper powder, molybdenum powder, chromium powder, palmitic acid, nickel oxide, reduced iron powder, manganese sulfide, aluminum oxide and micronized wax evenly, and pack them into cans for later use;

[0042] Step 2: Pressing: The mixed powder in the can is fed into a press, which feeds the powder into a preset product mold and presses it into a product blank of a set shape at a pressure of 76 MPa for standby use;

[0043] Step 3, sintering: Place the product blank into the conveyor mesh belt, and the conveyor mesh belt is sent into the sintering furnace at a set speed, the temperature is 260°C, and the product blank is sintered into a semi-finished product; the sintering step takes 4 hours; the sintering step is first preheated with electric heating, the preheating temperature is 850°C, and the sintering temperature is 950°C; H2 and N2 are used as protective gases in the sintering furnace;

[0044] Step 4: Cooling and oil immersion: Cool the semi-finished product and immerse it in engine oil at 90°C for 75 minutes;

[0045] Step 5: Finishing: Place the semi-finished product into the shaping mold for fine correction so that the semi-finished product reaches the required tolerance range;

[0046] Step 6: Deburring: The semi-finished product is deburred by shot peening.

[0047] Step 7: Steam treatment: steam the deburred semi-finished product to form a dense anti-rust layer on the surface of the semi-finished product, and then clean it to obtain the finished product. The temperature of the steam treatment step is 650° C., and the treatment time is 5.5 hours.

Claims

1. A gear powder metallurgy formula, characterized in that: The invention comprises the following formula components: 8-17 parts of graphite powder, 4-12 parts of carbon powder, 8-13 parts of copper powder, 2-6 parts of molybdenum powder, 3-9 parts of chromium powder, 5-9 parts of palmitic acid, 5-8 parts of nickel oxide, 50-98 parts of reduced iron powder, 1-5 parts of manganous sulfide, 5-10 parts of aluminum oxide and 0.5-1 part of micro powder wax.

2. The gear powder metallurgy formula according to claim 1, characterized in that: The gear powder metallurgy formula includes the following formula components: 13 parts of graphite powder, 7 parts of carbon powder, 11 parts of copper powder, 4 parts of molybdenum powder, 7 parts of chromium powder, 6 parts of palmitic acid, 7 parts of nickel oxide, 58 parts of reduced iron powder, 3 parts of manganous sulfide, 7 parts of aluminum oxide and 0.8 parts of micro powder wax.

3. A process for processing a gear powder metallurgy formula according to claim 1, characterized in that: The steps include: Step 1: Powder mixing: mix the powders of each component: graphite powder, carbon powder, copper powder, molybdenum powder, chromium powder, palmitic acid, nickel oxide, reduced iron powder, manganese sulfide, aluminum oxide and micronized wax evenly, and pack them into cans for later use; Step 2: Pressing: The mixed powder in the can is fed into a press, which feeds the powder into a preset product mold and presses it into a product blank of a set shape at a pressure of 72-79 MPa for standby use; Step 3, sintering: placing the product blank on a conveyor mesh belt, and sending the conveyor mesh belt into a sintering furnace at a set speed, at a temperature of 230°C-290°C, to sinter the product blank into a semi-finished product; Step 4: Cooling and oil immersion: Cool the semi-finished product and immerse it in engine oil at 80℃-110℃ for 60min-85min; Step 5: Finishing: Place the semi-finished product into the shaping mold for fine correction so that the semi-finished product reaches the required tolerance range; Step 6: Deburring: The semi-finished product is deburred by shot peening. Step 7, steam treatment: steam-treat the deburred semi-finished product to form a dense anti-rust layer on the surface of the semi-finished product, and then clean it to obtain a finished product.

4. The processing technology of the gear powder metallurgy formula according to claim 3 is characterized in that: The time of the sintering step is 2.5-5h; the sintering step is first preheated by electric heating, the preheating temperature is 700℃-950℃, and the sintering temperature is 750℃-1200℃; H2 and N2 are used as protective gases in the furnace of the sintering furnace.

5. The processing technology of the gear powder metallurgy formula according to claim 3 is characterized in that: The temperature of the steam treatment step is 600°C-750°C, and the treatment time is 5-6h.