Method and mould for manufacturing valve retainer

Abstract

The invention discloses a method for manufacturing a valve retainer, which comprises the following steps: arranging a sprue on a mould; and carrying out smelting, casting, demoulding, heat treatment and ground finishing on metal, wherein the mould is a directly molded mould for the valve retainer. Compared with the prior manufacturing method, the method for manufacturing the valve retainer saves four steps of sliping a head, boring an inner hole, digging up an excircle and cutting off. Therefore, the method simplifies the production steps, saves a large amount of labors, reduces the equipmentinput and energy consumption, shortens the production cycle and reduces the production cost.

Description

technical field

[0001] The invention relates to a manufacturing method of a valve seat ring, and also relates to a direct forming mold of the valve seat ring used in the manufacturing method. Background technique

[0002] The valve seat ring is one of the important parts of the automobile engine. Its function is to ensure the smooth exhaust and sealing of the exhaust valve of the automobile engine. Therefore, the valve seat ring is required to have the characteristics of high temperature resistance, wear resistance and oxidation resistance. The material used is high chromium alloy, and it also has high requirements on the processing accuracy of the specifications and dimensions of the valve seat ring, and the allowable error is extremely small. With the development of science and technology, people have higher and higher requirements for the performance of engine valve seat rings, and technicians are constantly adjusting and optimizing the processing technology and casting t...

Examples

Embodiment 1

[0021] The direct forming mold of the valve seat ring of the present embodiment, as figure 1 , 2 As shown, the direct forming mold for the valve seat includes a disc-shaped body 5, on which a plurality of annular grooves 1 are opened, and the disc-shaped body 5 is also provided with a guide groove 3, the guide The runner 3 is connected with all the annular grooves; there is a shut-off 2 at the connection between the diversion groove 3 and the annular groove 1. The function of the shut-off is to make the valve seat ring easy to remove from the casting body after demoulding, and at the same time It also facilitates the grinding of the gate of the valve seat ring.

[0022] The specific steps of the manufacturing method of the valve seat ring of the present embodiment are as follows:

[0023] (1) Install the gate on the mold: seal the top of the valve seat ring directly into the mold, and install the gate to communicate with the diversion groove of the mold;

[0024] (2) smelti...

Embodiment 2

[0029] The manufacturing method of the valve seat ring of the present embodiment is the same as embodiment 1, the difference is: as image 3 As shown, the mold used is formed by stacking several disc-shaped bodies 5 up and down, and the bottom of the diversion groove of the disc-shaped body 5 above the bottom disc-shaped body 6 is provided with communicating holes 4, Make the diversion grooves of each valve seat ring direct molding mold communicate with each other through the communication holes, ensure that the upper and lower disc-shaped bodies are aligned when installing the mold, and install the gate in the diversion groove of the uppermost mold during casting, using this implementation The mold of the example can cast multiple disc-shaped valve seat rings at one time, which increases the number of valve seat rings cast at one time and greatly improves the production efficiency.

Embodiment 3

[0031] The manufacturing method of the valve seat of the present invention and the direct forming mold of the valve seat used are the same as in Example 1, the difference is that the temperature used for casting is 1475°C, and the heat treatment is quenching at 965°C for 5 hours, and then at 700°C °C annealing for 5 hours.

technical field

[0001] The invention relates to a manufacturing method of a valve seat ring, and also relates to a direct forming mold of the valve seat ring used in the manufacturing method. Background technique

[0002] The valve seat ring is one of the important parts of the automobile engine. Its function is to ensure the smooth exhaust and sealing of the exhaust valve of the automobile engine. Therefore, the valve seat ring is required to have the characteristics of high temperature resistance, wear resistance and oxidation resistance. The material used is high chromium alloy, and it also has high requirements on the processing accuracy of the specifications and dimensions of the valve seat ring, and the allowable error is extremely small. With the development of science and technology, people have higher and higher requirements for the performance of engine valve seat rings, and technicians are constantly adjusting and optimizing the processing technology and casting t...

Examples

Embodiment 1

[0021] The direct forming mold of the valve seat ring of the present embodiment, as figure 1 , 2 As shown, the direct forming mold for the valve seat includes a disc-shaped body 5, on which a plurality of annular grooves 1 are opened, and the disc-shaped body 5 is also provided with a guide groove 3, the guide The runner 3 is connected with all the annular grooves; there is a shut-off 2 at the connection between the diversion groove 3 and the annular groove 1. The function of the shut-off is to make the valve seat ring easy to remove from the casting body after demoulding, and at the same time It also facilitates the grinding of the gate of the valve seat ring.

[0022] The specific steps of the manufacturing method of the valve seat ring of the present embodiment are as follows:

[0023] (1) Install the gate on the mold: seal the top of the valve seat ring directly into the mold, and install the gate to communicate with the diversion groove of the mold;

[0024] (2) smelti...

Embodiment 2

[0029] The manufacturing method of the valve seat ring of the present embodiment is the same as embodiment 1, the difference is: as image 3 As shown, the mold used is formed by stacking several disc-shaped bodies 5 up and down, and the bottom of the diversion groove of the disc-shaped body 5 above the bottom disc-shaped body 6 is provided with communicating holes 4, Make the diversion grooves of each valve seat ring direct molding mold communicate with each other through the communication holes, ensure that the upper and lower disc-shaped bodies are aligned when installing the mold, and install the gate in the diversion groove of the uppermost mold during casting, using this implementation The mold of the example can cast multiple disc-shaped valve seat rings at one time, which increases the number of valve seat rings cast at one time and greatly improves the production efficiency.

Embodiment 3

[0031] The manufacturing method of the valve seat of the present invention and the direct forming mold of the valve seat used are the same as in Example 1, the difference is that the temperature used for casting is 1475°C, and the heat treatment is quenching at 965°C for 5 hours, and then at 700°C °C annealing for 5 hours.

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