Low-pressure casting machine with casting and forging mechanism

Abstract

The utility model discloses a low-pressure casting machine with a casting and forging mechanism. The low-pressure casting machine comprises an air pressure feeding device, a mold and a sealing and extruding composite device, the mold comprises an upper mold and a lower mold, and a cavity is formed between the upper mold and the lower mold; the upper die is provided with a through hole, and the lower die is provided with a liquid inlet communicated with the riser tube; the air pressure feeding device is communicated with a lower die of the die through a liquid rising pipe; the sealing extrusion composite device comprises an extrusion piston rod and a sealing extrusion composite punch; the top of the sealing extrusion composite punch is a connecting part for mounting, the middle is an extrusion part, and the lower part is a sealing part; the sealing extrusion composite punch can do reciprocating motion in the through hole; the outer wall of the extrusion part is matched with the inner wall of the through hole, the outer wall of the sealing part is matched with the inner wall of the liquid inlet, and the diameter of the extrusion part is smaller than that of the extrusion part; a slag collecting bag is arranged on the outer periphery of the cavity, and an exhaust channel communicated with the outside of the mold is arranged above the slag collecting bag; the exhaust channel is kept in a communicated state.

Description

Technical Field

[0001] The utility model belongs to the field of low-pressure casting, and particularly relates to a low-pressure casting machine with a casting and forging mechanism. Background Art

[0002] Low-pressure casting is a method of using gas pressure to press molten metal into a cavity from bottom to top and solidifying it under pressure to obtain a casting. Since the pressure used is lower than that of die casting (generally 0.02 - 0.06 MPa), it is called low-pressure casting.

[0003] Its technological process is as follows: Pour the melted molten metal into the crucible of a resistance holding furnace, install a sealing cover, a riser pipe and a mold. Pass dry compressed air above the liquid level in the crucible, and the molten metal rises smoothly from the riser pipe under this pressure, injects and fills the cavity. The molten metal in the mold crystallizes under pressure until it is completely solidified. Remove the liquid level pressure, and the molten metal in the riser pipe flows back into the crucible under the action of gravity. Open the mold and take out the casting.

[0004] Traditional low-pressure casting equipment adopts the direct filling method with a pneumatic furnace. The filling pressure is low, the filling speed is stable and controllable, and the mold cavity is exhausted sufficiently. However, this method also has deficiencies: 1. Due to the relatively low forming specific pressure of the casting, the density of the casting is insufficient, and it is easy to generate pores, shrinkage cavities or shrinkage porosity. 2. The appearance contour of the casting is rough and thick-walled, and the post-processing workload is large, increasing the casting cost. Content of the Utility Model

[0005] In view of the above technical problems, the utility model discloses a low-pressure casting machine with a casting and forging mechanism, aiming to improve the density and surface smoothness of the casting.

[0006] To achieve the above object, the technical solution adopted by the utility model is: A low-pressure casting machine with a casting and forging mechanism mainly includes a pneumatic feeding device A; a mold B; and a sealing and extrusion composite device C.

[0007] The mold B includes an upper mold 3 and a lower mold 5, and a cavity 4 is formed between the upper mold 3 and the lower mold 5. The upper mold 3 is provided with a through hole, and the lower mold 5 is provided with a liquid inlet communicating with the riser pipe 10. The pneumatic feeding device A is connected to the lower mold 5 of the mold B through the riser pipe 10.

[0008] The sealing and extrusion composite device C includes an extrusion piston rod 1 and a sealing and extrusion composite punch 2 installed at the end of the extrusion piston rod 1. The top of the sealing and extrusion composite punch 2 is a connecting part for installation, the middle part is an extrusion part, and the lower part is a sealing part. The sealing and extrusion composite punch 2 can reciprocate in the through hole. The outer wall of the extrusion part fits with the inner wall of the through hole, the outer wall of the sealing part fits with the inner wall of the liquid inlet, and the diameter of the sealing part is smaller than that of the extrusion part.

[0009] Further, the upper mold 3 is connected to the moving template 14, and the lower mold 5 is connected to the stationary template 13. The pneumatic feeding device A is located below the stationary template 13. It further includes a mold clamping device D and guide posts F; the mold clamping device D is installed on the moving template 14. The lower ends of the guide posts F are fixed on the stationary template 13 and pass through the central holes of the mold clamping device D.

[0010] Further, it further includes a mold moving device E. The piston rod of the mold moving device E is connected to the moving template 14, and the cylinder block of the mold moving device E is relatively fixed to the stationary template 13.

[0011] Further, the sealing and extrusion compounding device C includes a sealing and extrusion compounding oil cylinder, and the sealing and extrusion compounding oil cylinder is relatively fixed to the moving template 14.

[0012] Further, the liquid inlet includes a lower mold opening and a mold sprue bushing 6 installed at the lower mold opening.

[0013] Further, the upper mold 3 is detachably connected to the moving template 14, and the sealing and extrusion compounding punch 2 is detachably connected to the extrusion piston rod 1.

[0014] Further, a slag collecting pocket 7 is provided on the outer peripheral edge of the cavity 4, and an exhaust passage 8 communicating with the outside of the mold B is provided above the slag collecting pocket 7. The exhaust passage 8 remains in a communicating state. The connection between the slag collecting pocket and the cavity is located at the lower part of the slag collecting pocket. There are at least 3 exhaust passages, and the exhaust passages include corrugated passages.

[0015] In the casting machine of the present utility model, the sealing and extrusion compounding device C can drive the sealing and extrusion compounding punch 2 to move downward through the extrusion piston rod 1, the sealing part closes the liquid inlet, and isolates the cavity 4 from the pneumatic feeding device A; then the extrusion compounding punch continues to move downward, and generates an extrusion force on the molten metal through the extrusion part, so that the molten metal in the mold cavity 4 cools and solidifies under high pressure, increasing the density of the casting and reducing defects such as shrinkage cavities and porosity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the mold closing state of the low-pressure casting machine with a casting and forging mechanism according to an embodiment of the present utility model.

[0017] Figure 2 It is a schematic diagram of the rising of molten metal in the low-pressure casting machine with a casting and forging mechanism according to an embodiment of the present utility model.

[0018] Figure 3 It is a schematic diagram of the molten metal filling the cavity in the low-pressure casting machine with a casting and forging mechanism according to an embodiment of the present utility model.

[0019] Figure 4 It is a schematic diagram of the sealing part closing the liquid inlet in the low-pressure casting machine with a casting and forging mechanism according to an embodiment of the present utility model.

[0020] Figure 5Schematic diagram of the extrusion of molten metal by the extrusion part of a low-pressure casting machine with a strip casting and forging mechanism according to an embodiment of the present invention.

[0021] In the figure: A, pneumatic feeding device; B, mold; C, sealing and extrusion composite device; D, mold clamping device; E, mold moving device; F, guide post; 1, extrusion piston rod assembly; 2, sealing and extrusion composite punch; 3, upper mold of the mold; 4, mold cavity; 5, lower mold of the mold; 6, mold gate sleeve; 7, casting slag collecting pocket; 8, mold exhaust passage; 9, air inlet passage; 10, lifting pipe; 11, exhaust passage; 12, molten metal; 13, static template; 14, moving template. Detailed implementation manners

[0022] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings.

[0023] The low-pressure casting machine with a strip casting and forging mechanism of this embodiment, as Figure 1 shown, mainly includes a pneumatic feeding device A; a mold B; a sealing and extrusion composite device C; a mold clamping device D; a mold moving device E; a guide post F.

[0024] The piston rod of the mold moving device E is connected to the moving template 14, and the cylinder body of the mold moving device E is relatively fixed to the static template 13. The mold B includes an upper mold 3 and a lower mold 5, and a cavity is formed between the upper mold 3 and the lower mold 5. The upper mold 3 is connected to the moving template 14, and the lower mold 5 is connected to the static template 13. The mold clamping device D and the sealing and extrusion composite oil cylinder C are installed on the moving template 14. The lower end of the guide post F is fixed on the static template 13 and passes through the central hole of the mold clamping device D. The pneumatic feeding device A is located below the static template 13 and is connected to the lower mold 5 of the mold B through the lifting pipe 10.

[0025] The extrusion composite device C includes an extrusion piston rod 1 and a sealing and extrusion composite punch 2 installed at the end of the extrusion piston rod 1. The top of the sealing and extrusion composite punch 2 is a connecting part for installation, the middle part is an extrusion part, and the lower part is a sealing part. The upper mold 3 is provided with a through hole, and the sealing and extrusion composite punch 2 can reciprocate in the through hole. The lower mold 5 is provided with a liquid inlet connected to the lifting pipe 10.

[0026] The outer wall of the extrusion part fits with the inner wall of the through hole, the outer wall of the sealing part fits with the inner wall of the liquid inlet, and the diameter of the sealing part is smaller than the diameter of the extrusion part.

[0027] A slag collecting pocket 7 is provided on the outer periphery of the cavity. An exhaust passage communicating with the outside of the mold is provided above the slag collecting pocket 7. The exhaust passage remains in a communicating state. The connection between the slag collecting pocket 7 and the cavity 4 is located at the lower part of the slag collecting pocket 7. There are no less than 3 exhaust passages 8, and the exhaust passages 8 include corrugated passages.

[0028] The liquid inlet includes a lower mold opening and a mold gate sleeve 6 installed at the lower mold opening.

[0029] Operation process (as Figures 2 - 5 shown):

[0030] 1. The moving die device E moves the moving die plate downward to make the upper die 3 and the lower die 5 of the die B contact.

[0031] 2. The die locking device D acts to deform the four guide pillars F to generate sufficient locking force to lock the die.

[0032] 3. Pressurize the feeding device A through the air inlet channel 9, and the molten metal 12 rises along the riser pipe 10 under the action of pressure.

[0033] 4. The molten metal 12 enters the die cavity 4 through the die gate bushing 6. The air in the die cavity 4 moves to the outside of the cavity under the push of the molten metal and is discharged to the atmosphere through the slag trap 7 and the exhaust channel 8.

[0034] 5. After the die cavity 4 is filled with molten metal, the air inlet channel 9 stops pressurizing the feeding device A, the exhaust channel 11 is opened for exhaust, and at the same time, the sealing extrusion composite device C acts. The extrusion piston rod 1 drives the sealing extrusion composite punch 2 to move downward to close the die gate bushing 6, isolating the die cavity 4 from the feeding device A.

[0035] 6. After the die cavity 4 is isolated from the feeding device A, the sealing extrusion composite punch 2 continues to move downward. Since the die cavity is already filled with molten metal, the annular area of the sealing extrusion composite punch 2 will generate a squeezing pressure of 50 - 100 MPa on the molten metal, causing the molten metal in the die cavity 4 to cool and solidify under high pressure, increasing the density of the casting and reducing defects such as shrinkage porosity.

[0036] The upper die 3 and the moving die plate 14 are detachably connected, and the sealing extrusion composite punch 2 and the extrusion piston rod 1 are detachably connected. By replacing different upper dies, lower dies, sealing extrusion composite punches, etc., the casting of different types of castings can be realized.

[0037] The above embodiments are only used to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the present invention.

Claims

1. A low-pressure casting machine with a casting and forging mechanism, characterized in that: It includes a pneumatic feeding device, a mold, and a sealing and extrusion composite device; The mold includes an upper mold and a lower mold, and a cavity is formed between the upper mold and the lower mold; The upper mold is provided with a through hole, and the lower mold is provided with a liquid inlet communicated with a lifting pipe; the pneumatic feeding device is communicated with the lower mold of the mold through the lifting pipe; The sealing and extrusion composite device includes an extrusion piston rod and a sealing and extrusion composite punch installed at the end of the extrusion piston rod; The top of the sealing and extrusion composite punch is a connecting part for installation, the middle part is an extrusion part, and the lower part is a sealing part; the sealing and extrusion composite punch can reciprocate in the through hole; the outer wall of the extrusion part fits with the inner wall of the through hole, and the outer wall of the sealing part fits with the inner wall of the liquid inlet, and the diameter of the sealing part is smaller than that of the extrusion part.

2. The low-pressure casting machine with a casting and forging mechanism according to claim 1, characterized in that: The upper mold is connected to the moving template, and the lower mold is connected to the static template; the pneumatic feeding device is located below the static template; It further includes a mold clamping device and guide columns; the mold clamping device is installed on the moving template; the lower ends of the guide columns are fixed on the static template and pass through the central holes of the mold clamping device.

3. The low-pressure casting machine with a casting and forging mechanism according to claim 2, characterized in that: It further includes a mold moving device; the piston rod of the mold moving device is connected to the moving template, and the cylinder body of the mold moving device is relatively fixed to the static template.

4. The low-pressure casting machine with a casting and forging mechanism according to claim 2 or 3, characterized in that: The sealing and extrusion composite device includes a sealing and extrusion composite oil cylinder, and the sealing and extrusion composite oil cylinder is relatively fixed to the moving template.

5. The low-pressure casting machine with a casting and forging mechanism according to claim 1, characterized in that: The liquid inlet includes a lower mold opening and a mold pouring sleeve installed at the lower mold opening.

6. The low-pressure casting machine with a casting and forging mechanism according to claim 1, characterized in that: The upper mold and the moving template are detachably connected, and the sealing and extrusion composite punch and the extrusion piston rod are detachably connected.

7. The low-pressure casting machine with a casting and forging mechanism according to claim 1 or 6, characterized in that: A slag collecting pocket is provided on the outer periphery of the cavity, and an exhaust channel communicated with the outside of the mold is provided above the slag collecting pocket; the exhaust channel remains in a communicating state; the connection between the slag collecting pocket and the cavity is located at the lower part of the slag collecting pocket, and there are no less than 3 exhaust channels, and the exhaust channels include corrugated passages.

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