CN-121972639-A - Fixed-point pouring method for vacuum casting

CN121972639ACN 121972639 ACN121972639 ACN 121972639ACN-121972639-A

Abstract

The invention relates to the technical field of vacuum casting, in particular to a fixed-point casting method for vacuum casting. Based on the completion of smelting of a smelting furnace in a smelting chamber, moving a molded shell to a heat preservation chamber to be positioned so that a pouring cup of the molded shell penetrates into a pouring hole at the top of the heat preservation chamber, controlling a push rod to push the smelting furnace to rotate around a first axis by a first angle in a first rotation direction so as to enable the smelting furnace to rotate from a vertical state to a first inclined state, controlling a lifting rod to descend a preset distance from the first axis so as to enable the smelting furnace to rotate around the first axis by a second angle in the first rotation direction, and controlling the push rod to rotate the smelting furnace around the first axis by a third angle in the first rotation direction so as to enable the smelting furnace to rotate from a second inclined state to a third inclined state. Therefore, the problem that the drop point precision of the molten metal pouring casting process in the smelting furnace is difficult to guarantee due to the overlarge height difference brought under the vacuum condition is solved.

Inventors

LIU ZHIZHONG
LI WANQING
HE YONGLIANG
ZHANG PENGCHENG
JIN LEI
XIE HUASHENG
DU BING
YANG JINGMING
Wang Yita
ZHANG HELONG
WEN SHAOWEI
LIU XINFENG

Assignees

中国机械总院集团沈阳铸造研究所有限公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (12)

1. The vacuum casting fixed-point pouring method is characterized by comprising the following steps of: Based on the completion of smelting in a smelting furnace in a smelting chamber, moving a molded shell to a heat preservation chamber for positioning so that a pouring cup of the molded shell penetrates into a pouring hole at the top of the heat preservation chamber, wherein the pouring hole is vertically arranged; The control push rod pushes the smelting furnace to rotate around a first axis by a first angle in a first rotation direction so as to enable the smelting furnace to rotate from a vertical state to a first inclined state, wherein the first axis is horizontally arranged, the first angle is an acute angle, and the first axis is positioned at one side of a space above the pouring hole, which deviates along the first horizontal direction; The lifting rod is controlled to descend the first axis by a preset distance so that the smelting furnace rotates around the first axis by a second angle in the first rotation direction, and the smelting furnace rotates from the first inclined state to the second inclined state; Controlling the push rod to rotate the smelting furnace around the first axis by a third angle in the first rotation direction so as to enable the smelting furnace to rotate from the second inclined state to a third inclined state.
2. The method of claim 1, wherein the second angle is greater than the first angle.
3. The method of claim 2, wherein the third angle is greater than the second angle.
4. The method of claim 1, wherein the sum of the first angle, the second angle, and the third angle is greater than 90 °.
5. A vacuum casting spot casting method according to claim 1, the method is characterized in that the vacuum casting fixed-point pouring method further comprises the following steps: When the smelting furnace is in the second inclined state and the smelting furnace rotates towards the third inclined state, the smelting furnace is controlled to move along the first horizontal direction until the smelting furnace reaches a first condition.
6. The method of casting at fixed point in vacuum according to claim 5, wherein the first condition includes the melting furnace being disposed horizontally.
7. A vacuum casting spot casting method according to claim 5, the method is characterized in that the vacuum casting fixed-point pouring method further comprises the following steps: When the smelting furnace reaches the first condition and the smelting furnace rotates towards the third inclined state, the smelting furnace is controlled to move along the second horizontal direction until the smelting furnace reaches the second condition, and the first horizontal direction is opposite to the second horizontal direction.
8. The method of claim 7, wherein the second condition includes the melting furnace being in the third inclined state.
9. The vacuum casting fixed point pouring method according to claim 7, wherein the second distance is greater than the first distance, the first distance is a distance that the smelting furnace moves in the first horizontal direction, and the second distance is a distance that the smelting furnace moves in the second horizontal direction.
10. The vacuum casting spot casting method as claimed in claim 9, further comprising: And when the pouring of the furnace burden is completed, the smelting furnace is restored to the vertical upward posture.
11. The method of vacuum casting spot casting according to claim 10, wherein returning the melting furnace to the vertically upward attitude when the pouring of the burden is completed comprises: When the burden is poured, controlling the push rod to rotate the smelting furnace around the first axis by a third angle in a second rotation direction, and simultaneously controlling the smelting furnace to move a third distance along the first horizontal direction so as to adjust the smelting furnace from the third inclined state to the second inclined state, wherein the third distance is a difference value between the second distance and the first distance; Controlling the lifting rod to lift the first axis by the preset distance so as to enable the smelting furnace to rotate around the first axis by the second angle in the second rotation direction, and adjusting the smelting furnace from the second inclined state to the first inclined state; Controlling the push rod to rotate the smelting furnace around the first axis by the first angle in the second rotation direction so as to enable the smelting furnace to recover to a vertical state from the first inclined state.
12. The method according to claim 1, wherein in a state where the melting in the melting furnace is completed, the molten metal contained in the melting furnace is less than 80% of the volume of the melting furnace, so that the amount of the molten metal flowing out of the melting furnace in the process from the vertical state to the second inclined state is 0.

Description

Fixed-point pouring method for vacuum casting Technical Field The invention relates to the technical field of vacuum casting, in particular to a fixed-point casting method for vacuum casting. Background The vacuum casting equipment is core operation equipment in the field of metal precision forming, and each operation cavity of the vacuum casting equipment is required to complete corresponding procedures in a stable vacuum environment. In the structural design of the existing vacuum casting equipment, a smelting chamber for completing metal raw material smelting operation and a heat preservation chamber for completing shell heat preservation operation are generally arranged in a mutually independent split structure, and the structure can prevent interference to stable vacuum degree maintained in the heat preservation chamber when the smelting chamber breaks a vacuum environment due to material supplementing and other operations, so that the operation continuity and stability of shell heat preservation procedures are ensured. On the spatial layout of equipment, the prior art generally sets up the smelting chamber in the top of heat preservation room, and this overall structure of smelting furnace that this overall arrangement made to dispose in the smelting chamber all is in the top of the pouring basin of heat preservation intracavity shell to this satisfies the operation demand that the molten metal relies on gravity to accomplish the pouring after the smelting is accomplished. However, the vertical layout of the existing smelting chamber and the heat preservation chamber is limited, a high height difference exists between the furnace mouth of the smelting furnace and the pouring cup of the mold shell, after molten metal flows out of the furnace mouth in the process of pouring molten metal in the smelting furnace, the molten metal can be influenced by factors such as tiny deviation of pouring action, air flow disturbance in a vacuum environment and the like in a longer falling stroke, so that the falling track of the molten metal is deviated, the falling point accuracy of the molten metal entering the pouring cup is finally and directly influenced, and the core problem is the overlarge height difference caused by the existing structure, so that the falling point accuracy of the molten metal pouring casting process cannot be guaranteed. Disclosure of Invention In order to solve the problem that the overlarge height difference is caused under the vacuum condition and the falling point precision of the molten metal pouring casting process in a smelting furnace is difficult to guarantee, the invention provides a vacuum casting fixed-point pouring method, which comprises the following steps: Based on the completion of smelting in a smelting furnace in a smelting chamber, moving a molded shell to a heat preservation chamber for positioning so that a pouring cup of the molded shell penetrates into a pouring hole at the top of the heat preservation chamber, wherein the pouring hole is vertically arranged; The control push rod pushes the smelting furnace to rotate around a first axis by a first angle in a first rotation direction so as to enable the smelting furnace to rotate from a vertical state to a first inclined state, wherein the first axis is horizontally arranged, the first angle is an acute angle, and the first axis is positioned at one side of a space above the pouring hole, which deviates along the first horizontal direction; The lifting rod is controlled to descend the first axis by a preset distance so that the smelting furnace rotates around the first axis by a second angle in the first rotation direction, and the smelting furnace rotates from the first inclined state to the second inclined state; Controlling the push rod to rotate the smelting furnace around the first axis by a third angle in the first rotation direction so as to enable the smelting furnace to rotate from the second inclined state to a third inclined state. Optionally, the second angle is greater than the first angle. Optionally, the third angle is greater than the second angle. Optionally, the sum of the first angle, the second angle and the third angle is greater than 90 °. Optionally, the vacuum casting fixed-point pouring method further comprises: When the smelting furnace is in the second inclined state and the smelting furnace rotates towards the third inclined state, the smelting furnace is controlled to move along the first horizontal direction until the smelting furnace reaches a first condition. Optionally, the first condition includes the smelting furnace being disposed horizontally. Optionally, the vacuum casting fixed-point pouring method further comprises: When the smelting furnace reaches the first condition and the smelting furnace rotates towards the third inclined state, the smelting furnace is controlled to move along the second horizontal direction until the smelting furnace reaches the second condition, and the f