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CN-117483659-B - Anti-deformation casting mold and casting method for connection base for spaceflight

CN117483659BCN 117483659 BCN117483659 BCN 117483659BCN-117483659-B

Abstract

The invention discloses a deformation-preventing casting mold for a connection base for spaceflight and a casting method, wherein the mold comprises an upper mold and a lower mold, a cavity is arranged on the lower mold, a mold core is arranged on the upper mold, a pouring gate is arranged on the upper mold, a knocking mechanism is arranged on the lower mold, a rotating ring is arranged on the lower mold, a wave crest and a wave trough are arranged on the rotating ring, a driving mechanism is arranged on the lower mold, a pressing column is arranged on the rotating ring, a vertical counter bore is arranged on the rotating ring, the pressing column is connected with the vertical counter bore through a spring, a second knocking rod is arranged on the rotating ring, and a transverse counter bore is arranged on the inner wall of the rotating ring and is communicated with the vertical counter bore. The driving mechanism can drive the rotating ring to rotate, so that the rotating ring can drive the knocking mechanism to move up and down, and meanwhile, the knocking mechanism can squeeze the compression column, so that the second knocking rod extends out to knock the lower die, and molten metal can fill up gaps in the cavity under the action of vibration.

Inventors

  • QIN HAO
  • XU YIFENG

Assignees

  • 江苏优格曼航空科技有限公司

Dates

Publication Date
20260505
Application Date
20231129

Claims (10)

  1. 1. The anti-deformation casting mold for the connection base for the aerospace is characterized by comprising an upper mold (1) and a lower mold (2), wherein a cavity (22) for filling molten metal is arranged on the lower mold (2), a core (11) matched with the cavity (22) is arranged on the upper mold (1), and a pouring gate (12) for pouring molten metal into the cavity (22) is arranged on the upper mold (1); A plurality of knocking mechanisms (4) are circumferentially arranged on the side wall of the lower die (2), and the knocking mechanisms (4) are in sliding connection with vertical sliding grooves formed in the lower die (2); The lower die (2) is rotationally connected with a rotating ring (3), the rotating ring (3) is provided with wave crests (31) and wave troughs (37) which are distributed in a staggered way, the wave crests (31) are in contact with the knocking mechanism and are used for pushing the knocking mechanism (4) to move upwards to the inner top of the vertical sliding chute, the wave troughs (37) are provided with gaps with the knocking mechanism (4) positioned at the inner bottom of the vertical sliding chute, and the side wall of the lower die (2) is provided with a driving mechanism for driving the rotating ring (3) to rotate; Each wave crest (31) and rotating rings (3) on two sides of the wave crest (31) are respectively provided with a plurality of pressing columns (34) used for being contacted with the knocking mechanism (4) to be extruded, the rotating rings (3) are provided with vertical counter bores which are in one-to-one correspondence with the pressing columns (34) to be in sliding sealing connection, and the pressing columns (34) are connected with the vertical counter bores through springs; A plurality of second knocking rods (35) which are in one-to-one correspondence with the pressing columns (34) are arranged on the inner wall of the rotating ring (3), transverse counter bores which are in one-to-one correspondence with the second knocking rods (35) and are in sliding sealing connection are arranged on the inner wall of the rotating ring (3), a plurality of transverse counter bores are communicated with corresponding vertical counter bores, and hydraulic oil is filled in the transverse counter bores and the vertical counter bores.
  2. 2. The anti-deformation casting mold for the connection base for aerospace according to claim 1, wherein the connection plate (21) is arranged on the side wall of the lower mold (2), the driving mechanism comprises a motor (36) fixedly arranged on the connection plate (21), a first gear (32) fixedly sleeved on an output shaft of the motor (36), and a toothed ring (33) sleeved on the rotating ring (3) and used for being meshed with the first gear (32).
  3. 3. The anti-deformation casting mold for the connection base for aerospace according to claim 1, wherein the knocking mechanism comprises a sliding block (41) slidingly connected with a vertical sliding groove, a rotating disc (42) rotatably arranged on the sliding block (41) and used for being in contact fit with the rotating ring (3) so as to move upwards, a fixed rod (43) fixedly arranged on the rotating disc (42), and a first knocking rod (44) transversely arranged on the fixed rod (43); The rotary disc (42) is rotationally connected with the sliding block (41) through a rotating shaft sleeved with a torsion spring, one end of the first knocking rod (44) is in contact with the side wall of the lower die (2), the other end of the first knocking rod (44) penetrates through the fixed rod (43), a first limiting ring (46) is fixedly sleeved on the first knocking rod (44) at one side of the fixed rod (43), the first limiting ring (46) is connected with the fixed rod (43) through a liquid bag (47), a second limiting ring (48) is fixedly sleeved on the first knocking rod (44) at the other side of the fixed rod (43), and the second limiting ring (48) is connected with the fixed rod (43) through a spring; The side wall of the lower die (2) is provided with a plurality of bulges (45) which are used for being matched with the first knocking rod (44) in a swinging way to knock, the first knocking rod (44) is internally provided with a liquid channel for applying lubricating oil to the bulges (45), and the liquid channel is communicated with the liquid bag (47).
  4. 4. The anti-deformation casting mold for the connection base for aerospace according to claim 1, wherein the lower mold (2) is provided with a positioning hole, and the upper mold (1) is provided with a positioning pin matched with the positioning hole.
  5. 5. The anti-deformation casting mold for the connection base for aerospace according to claim 1, wherein the inner top of the vertical sliding groove is connected with the knocking mechanism through a spring, and the knocking mechanism is provided with a balancing weight.
  6. 6. A mould for casting a connection base for space flight, as claimed in claim 3, characterized in that the distance between each two adjacent press studs (34) on the rotating ring (3) is less than 1/2 of the arc length of a single oscillation of the rotating disc (42).
  7. 7. The anti-deformation casting mold for the connection base for aerospace according to claim 1, wherein the preparation method of the lower mold (2) comprises the following steps: S1, taking powder Taking n grades of silicon carbide powder and n grades of alumina powder, wherein n is a natural number of 4-6, the particle size of the silicon carbide powder is gradually reduced along with the improvement of the grades, the particle size of the alumina powder is gradually increased along with the improvement of the grades, the particle sizes of the n grades of silicon carbide powder are all 5-400 mu m, and the particle sizes of the n grades of alumina powder are all 5-300 mu m; S2, mixing powder Mixing silicon carbide powder of each grade with alumina powder of a corresponding grade to obtain mixed powder of each grade, wherein the alumina powder of the first grade accounts for 50-60%, and then the alumina powder of each grade is reduced by 2-4% compared with the alumina powder of the previous grade; S3, 3D prints Loading the first-stage mixed powder into 3DP printing equipment for layer-by-layer printing, wherein the printing layer thickness is t, printing by using the next-stage mixed powder after printing x layers until the blank of the lower die (2) is printed, and the value of x accords with the following formula: wherein h is the height of the lower die (2), the unit mm, n is the grade number of silicon carbide powder and alumina powder, and t is more than or equal to 0.6 and less than or equal to 0.1, and the unit mm; S4, sintering And placing the blank into a sintering furnace, gradually heating the sintering furnace to 2000-2200 ℃, preserving heat for 6-8 hours, and discharging and cooling to obtain the lower die (2).
  8. 8. The anti-deformation casting mold for the connection base for aerospace according to claim 7, wherein in the step S2, powder mixing is performed by adopting a ball mill, the ball-material ratio of the ball mill is 1:3, and the powder mixing time is 30-50 min.
  9. 9. The mold for casting the connection base for aerospace, which is used for preventing deformation according to claim 7, wherein in the step S4, a temperature rising curve of a sintering furnace in a temperature rising process is that the temperature rises to 800-900 ℃ at a speed of 10-15 ℃ per minute, then rises to 1400-1500 ℃ at a speed of 6-8 ℃ per minute, then rises to 1800-1900 ℃ at a speed of 3-5 ℃ per minute, and is kept for 1-2 hours, and then rises to 2000-2200 ℃ at a speed of 0.5-2 ℃ per minute.
  10. 10. An anti-deformation connection base casting method for aerospace based on the anti-deformation connection base casting mold for aerospace according to any one of claims 1-9, which is characterized by comprising the following steps: S4-1, placing a metal raw material into a smelting furnace for smelting, standing for 2-5 minutes after the metal raw material is melted into molten metal, folding an upper die (1) and a lower die (2), then starting a driving mechanism to enable the driving mechanism to drive a rotating ring (3) to rotate, pouring the molten metal into a die cavity (22) through a pouring gate (12) for casting, and filling the die cavity (22) with the molten metal; s4-2, intermittently contacting the knocking mechanism (4) when the rotating ring (3) rotates, so that the knocking mechanism (4) can slide up and down to guide and knock the upper side wall of the lower die (2) in an up and down reciprocating manner, and meanwhile, the knocking mechanism (4) intermittently extrudes the pressing column (34); S4-3, the pressing column (34) descends and extrudes hydraulic oil after being pressed, the second knocking rod (35) stretches out under the pressure action of the hydraulic oil, and the rotating ring (3) rotates to uniformly knock the side wall of the lower part of the lower die (2) in a surrounding mode, so that molten metal can fill up gaps in the die cavity (22) under the vibration action generated by knocking; S4-4, waiting for solidification and molding of molten metal, and taking out the upper die (1) to obtain the connecting base.

Description

Anti-deformation casting mold and casting method for connection base for spaceflight Technical Field The invention relates to the technical field of metal casting, in particular to an anti-deformation casting mold and a casting method for a connection base for spaceflight. Background The casting is a technological process of smelting metal into liquid meeting certain requirement, pouring the liquid into casting mould, cooling, solidifying and cleaning to obtain the casting with preset shape, size and performance. The cast blank is almost shaped, so that the aim of mechanical machining or small amount of machining is fulfilled, the cost is reduced, and the manufacturing time is reduced to a certain extent. The casting mould commonly used at present mainly comprises a sand mould, a metal mould, a ceramic mould and the like, wherein the sand mould is low in cost, but cannot be repeatedly used for many times, the service life is shorter, the metal mould is stable in size and high in precision, and can be repeatedly used for many times, so that the casting mould is widely applied. However, when metal with poor fluidity is cast, the molten metal cannot fully fill gaps at the edges of the cavity, and the molten metal on the casting cannot be fed effectively, so that defects appear on the surface or in the metal casting. Therefore, an anti-deformation casting mold and a casting method for the connection base for spaceflight are provided. Disclosure of Invention In order to solve the technical problems, the invention provides an anti-deformation casting mold and a casting method for a connection base for spaceflight. The invention has the technical scheme that the anti-deformation casting mold for the connection base for spaceflight comprises an upper mold and a lower mold, wherein the lower mold is provided with a cavity for filling molten metal, the upper mold is provided with a core matched with the cavity, and the upper mold is provided with a pouring gate for pouring molten metal into the cavity; A plurality of knocking mechanisms are circumferentially arranged on the side wall of the lower die and are in sliding connection with a vertical chute arranged on the lower die; the lower die is rotationally connected with a rotating ring, the rotating ring is provided with wave crests and wave troughs which are distributed in a staggered way, the wave crests are in contact with the knocking mechanism and used for pushing the knocking mechanism to move upwards to the inner top of the vertical sliding chute, gaps are reserved between the wave troughs and the knocking mechanism positioned at the inner bottom of the vertical sliding chute, and the side wall of the lower die is provided with a driving mechanism used for driving the rotating ring to rotate; a plurality of pressing columns used for being contacted with the knocking mechanism to extrude are arranged on each wave crest and the rotating rings on two sides of the wave crest, vertical counter bores in one-to-one correspondence with the pressing columns are arranged on the rotating rings to be in sliding sealing connection, and the pressing columns are connected with the vertical counter bores through springs; a plurality of second knocking rods corresponding to the pressing columns one by one are arranged on the inner wall of the rotating ring, transverse counter bores which are in sliding sealing connection with the second knocking rods one by one are arranged on the inner wall of the rotating ring, a plurality of transverse counter bores are communicated with the corresponding vertical counter bores, and hydraulic oil is filled in the transverse counter bores and the vertical counter bores. The die can drive the rotating ring to rotate through the driving mechanism, so that the rotating disc drives the knocking mechanism to move up and down, the knocking mechanism can knock the lower die, the knocking mechanism can squeeze the compression column when contacting with the rotating disc, the second knocking rod stretches out to knock the lower die under the action of pressure, and molten metal can fill up gaps in the die cavity under the action of vibration generated by knocking, so that casting defects are reduced. Further, a connecting plate is arranged on the side wall of the lower die, and the driving mechanism comprises a motor fixedly arranged on the connecting plate, a first gear fixedly sleeved on an output shaft of the motor, and a toothed ring sleeved on the rotating ring and used for being meshed with the first gear. The driving mechanism drives the first gear to rotate through the motor, so that the first gear drives the rotating ring to rotate through the gear ring. Further, the knocking mechanism comprises a sliding block which is in sliding connection with the vertical sliding groove, a rotating disc which is rotatably arranged on the sliding block and is used for being in contact fit with the rotating ring so as to move upwards, a fixed rod which