Molding molds for compressor screw rotors

Abstract

The invention discloses a forming die for a compressor screw rotor, comprising a die frame, a lifting drive device is fixed at the bottom of the die frame, a lower die is fixedly connected to the upper end of the lifting drive device, an upper die matched with the lower die is arranged above the lower die, the upper die is fixed on the die frame, an upper fixed cover of the upper die is provided with an upper end cover, a runner is connected to the upper end cover, a forming cavity of the screw rotor is formed inside after the lower die and the upper die are combined, and the runner is connected to the forming cavity. The forming die for a compressor screw rotor of the invention solves the problems of the prior art that the screw rotor processing method is slow, more tooling is used, and the working efficiency is low.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing devices and relates to a forming die for a screw rotor of a compressor. Background Art

[0002] The screw rotor is a key part of the screw compressor. It has a complex profile and high processing requirements. The reliability, efficiency and noise of the compressor depend to a large extent on the design and manufacture of the screw rotor. Therefore, the research on its manufacturing technology has always been an important research topic for the development of the industry. Most air compressor screw rotor manufacturers adopt the process route of rough milling-tempering-fine milling. Some manufacturers have introduced foreign CNC screw rotor grinders and adopted the rough milling-tempering-fine grinding process. Although the processing of screw rotors in my country has developed from milling to grinding, it is all cutting processing on bar materials, and post-processing is carried out after the processing is completed. In addition, the early processing cycle is long and the efficiency is low, which seriously restricts the further development of my country's compressor industry. Summary of the invention

[0003] The purpose of the present invention is to provide a molding die for a compressor screw rotor, which solves the problems in the prior art of slow early processing speed of the screw rotor, more tooling used and low working efficiency.

[0004] The technical solution adopted by the present invention is a molding die for a compressor screw rotor, comprising a mold frame, a lifting drive device fixed at the bottom of the mold frame, a lower mold fixedly connected to the upper end of the lifting drive device, an upper mold matched with the lower mold arranged above the lower mold, the upper mold fixed on the mold frame, an upper fixed cover of the upper mold provided with an upper end cover, the upper end cover connected with a runner, and a molding cavity for the screw rotor is formed inside after the lower mold and the upper mold are combined, and the runner is connected to the molding cavity.

[0005] The present invention is also characterized in that

[0006] The bottom of the mold frame is fixedly connected with a bottom plate, and the lifting drive device is fixed on the bottom plate.

[0007] The lifting drive device includes a motor fixed on the base plate, a small gear is fixedly connected to the output shaft of the motor, a large gear is meshed with the small gear, a nut is fixedly connected inside the large gear, a screw rod matching with the nut is connected inside the nut, and the lower surface of the lower mold is fixed to the top of the screw rod.

[0008] A connecting piece is fixed on the bottom plate, the motor is fixed on the connecting piece, the output shaft of the motor is fixedly connected with the connecting shaft, and the pinion is fixed on the connecting shaft through key A.

[0009] A through hole is arranged on the bottom plate, the screw rod passes through the through hole, and the nut and the large gear are fixedly connected by key B.

[0010] A boss is arranged at the middle part of the outer side wall of the nut and around the outer side wall, and the large gear is fixed on the nut above the boss.

[0011] One end of the nut located below the boss is provided with a lower end cover, and the lower end cover is fixed on the mold frame.

[0012] A baffle is sleeved on the nut above the large gear. The baffle 12 is fixed on the mold frame 19, and a bearing is arranged between the nut and the baffle.

[0013] A molding cavity for forming the upper end shoulder of the screw rotor is provided at the upper end of the upper mold, a molding cavity for forming the spatial curved surface of the screw rotor is provided at the lower end of the upper mold, a molding cavity for forming the lower end shoulder of the screw rotor is provided in the lower mold, and the three molding cavities form a molding cavity for the screw rotor. The runner is connected to the molding cavity at the upper end of the upper mold, and a boss A is provided on the lower surface of the molding cavity of the lower mold.

[0014] A fixing plate is provided on the outer side wall of the upper mold, and the fixing plate is fixed on the mold frame.

[0015] The beneficial effects of the present invention are as follows: the present invention adopts a mold to form a screw rotor, and utilizes the transmission mode of the screw nut to drive the mold to demould, so as to realize one-time rapid forming of a complex-shaped screw rotor blank, with high efficiency, reduced production tooling, simple structure and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a stereoscopic view of a molding die for a compressor screw rotor according to the present invention;

[0017] Figure 2 yes Figure 1 The main view of

[0018] Figure 3 yes Figure 2 AA section view.

[0019] In the figure, 1. runner, 2. upper end cover, 3. cavity, 4. fixing plate, 5. upper mold, 6. screw, 7. lower mold, 8. nut, 9. lower end cover, 10. key B, 11. large gear, 12. baffle, 13. small gear, 14. key A, 15. connecting shaft, 16. bottom plate, 17. connecting piece, 18. motor, 19. mold frame, 20. through hole, 21. boss, 22. boss A. DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The present invention is used for the forming die of the screw rotor of the compressor, and its structure is as follows Figure 1-3As shown, it includes a mold frame 19, a lifting drive device is fixed at the bottom of the mold frame 19, a lower mold 7 is fixedly connected to the upper end of the lifting drive device, an upper mold 5 matching the lower mold 7 is arranged above the lower mold 7, the upper mold 5 is fixed on the mold frame 19, an upper fixed cover of the upper mold 5 is provided with an upper end cover 2, and a runner 1 is connected to the upper end cover 2. After the lower mold 7 and the upper mold 5 are molded together, a forming cavity 3 of the screw rotor is formed inside, and the runner 1 is connected to the forming cavity 3.

[0022] The bottom of the mold frame 19 is fixedly connected to the bottom plate 16 , and the lifting drive device is fixed on the bottom plate 16 .

[0023] The lifting drive device includes a motor 18 fixed on a base plate 16, a pinion 13 is fixedly connected to the output shaft of the motor 18, the pinion 13 is meshed with a large gear 11, a nut 8 is fixedly connected inside the large gear 11, a screw 6 matching with the nut 8 is connected inside the nut 8, and the lower surface of the lower mold 7 is fixed to the top of the screw 6.

[0024] A connecting piece 17 is fixed on the bottom plate 16 , a motor 18 is fixed on the connecting piece 17 , an output shaft of the motor 18 is fixedly connected to the connecting shaft 15 , and the pinion 13 is fixed on the connecting shaft 15 via a key A14 .

[0025] A through hole 20 is provided on the bottom plate 16, and the screw rod 6 passes through the through hole 20, so that the screw rod 6 can pass through the hole and move up and down. The nut 8 and the large gear 11 are fixedly connected by a key B10.

[0026] A boss 21 is provided in the middle of the outer wall of the nut 8 and around the outer wall thereof, and the large gear 11 is fixed on the nut 8 above the boss 21 .

[0027] One end of the nut 8 below the boss 21 is provided with a lower end cover 9 , and the lower end cover 9 is fixed on the mold frame 19 .

[0028] A baffle 12 is sleeved on the nut 8 above the large gear 11, and the baffle 12 is fixed on the mold frame 19. A bearing is provided between the nut 8 and the baffle 12 so that the nut 8 can rotate normally. At the same time, the baffle 12 can limit the axial upward movement of the large gear 11.

[0029] A molding cavity for forming the upper end shoulder of the screw rotor is provided at the upper end of the upper mold 5, a molding cavity for forming the spatial curved surface of the screw rotor is provided at the lower end of the upper mold 5, a molding cavity for forming the lower end shoulder of the screw rotor is provided in the lower mold 7, and the three molding cavities form a molding cavity 3 for the screw rotor. The runner 1 is connected to the molding cavity at the upper end of the upper mold 5, and a boss A22 is provided on the lower surface of the molding cavity of the lower mold 7. The boss A22 is convenient for demolding the screw rotor.

[0030] A fixing plate 4 is fixedly sleeved on the outer side wall of the upper mold 5 , and the fixing plate 4 is fixed on the mold frame 19 .

[0031] The working process of the molding die for the compressor screw rotor of the present invention is as follows: before working, check whether the structure of the device is intact, start working after checking, start the motor 18, the connecting shaft 15 drives the small gear 13 to rotate, the small gear 13 is meshed with the large gear 11, and the large gear 11 drives the nut 8 to rotate. Due to the action of the lower end cover 9 and the baffle 12, the nut 8 is restricted from axial movement, the nut 8 rotates, and drives the screw 6 to move upward until it contacts the lower mold 7 and the upper mold 5, and the upper mold 5 and the lower mold 7 are manually connected and fixed with bolts. At this time, the forming cavity 3 of the screw rotor is formed; the runner 1 is connected to the pouring equipment, and the heated molten metal melt is injected into the closed mold through the runner 1. In the forming cavity 3, after the processes of pouring, holding pressure, cooling, etc., the mold is ready to be opened; the connecting parts of the upper mold 5 and the lower mold 7 are opened manually, and the motor 18 rotates in the opposite direction, driving the small gear 13 and the large gear 11 to move, thereby driving the nut 8 to rotate in the opposite direction, and driven by the screw 6, the lower mold 7 will rotate and move downward at the same time; when the lower mold 7 moves downward, since the corresponding boss is provided in the lower mold 7, the lower mold 7 will drive the formed screw rotor to produce consistent movement with the lower mold 7 during the movement, and the motor 18 moves until the screw rotor is separated from the upper mold 5; finally, the lower mold 7 is separated from the formed screw rotor to complete a screw rotor forming process.

Claims

1. A molding die for a compressor screw rotor, characterized in that: The invention comprises a mold frame (19), a lifting drive device is fixed at the bottom of the mold frame (19), a lower mold (7) is fixedly connected to the upper end of the lifting drive device, an upper mold (5) matching with the lower mold (7) is arranged above the lower mold (7), the upper mold (5) is fixed on the mold frame (19), an upper fixed cover of the upper mold (5) is provided with an upper end cover (2), a runner (1) is connected to the upper end cover (2), and a forming cavity (3) of a screw rotor is formed inside the lower mold (7) and the runner (1) is connected to the forming cavity (3); The bottom of the mold frame (19) is fixedly connected to a bottom plate (16), and the lifting drive device is fixed on the bottom plate (16); The lifting drive device comprises a motor (18) fixed on the bottom plate (16), a pinion (13) fixedly connected to the output shaft of the motor (18), the pinion (13) meshing with a large gear (11), a nut (8) fixedly connected inside the large gear (11), a screw (6) mating therewith connected inside the nut (8), and a lower surface of the lower mold (7) fixedly connected to the top of the screw (6); The upper end of the upper die (5) is provided with a molding cavity for forming the upper end shoulder of the screw rotor, the lower end of the upper die (5) is provided with a molding cavity for forming the spatial curved surface of the screw rotor, the lower die (7) is provided with a molding cavity for forming the lower end shoulder of the screw rotor, the three molding cavities form a molding cavity (3) for the screw rotor, the runner (1) is connected to the molding cavity at the upper end of the upper die (5), and the lower surface of the molding cavity of the lower die (7) is provided with a boss A (22), and the boss A (22) enables the lower die (7) to drive the formed screw rotor to move in unison with the lower die (7) during the movement of the lower die (7).

2. The molding die for a compressor screw rotor according to claim 1, characterized in that: A connecting piece (17) is fixed on the base plate (16), the motor (18) is fixed on the connecting piece (17), the output shaft of the motor (18) is fixedly connected to the connecting shaft (15), and the pinion (13) is fixed on the connecting shaft (15) via a key A (14).

3. The molding die for a compressor screw rotor according to claim 2, characterized in that: The bottom plate (16) is provided with a through hole (20), the screw rod (6) passes through the through hole (20), and the nut (8) and the large gear (11) are fixedly connected via a key B (10).

4. The molding die for a compressor screw rotor according to claim 3, characterized in that: A boss (21) is provided in the middle of the outer side wall of the nut (8) and around the outer side wall, and the large gear (11) is fixed on the nut (8) above the boss (21).

5. The molding die for a compressor screw rotor according to claim 4, characterized in that: A lower end cover (9) is sleeved on one end of the nut (8) located below the boss (21), and the lower end cover (9) is fixed on the mold frame (19).

6. The molding die for a compressor screw rotor according to claim 4, characterized in that: A baffle (12) is sleeved on the nut (8) above the large gear (11); the baffle (12) is fixed on the mold frame (19); and a bearing is provided between the nut (8) and the baffle (12).

7. The molding die for a compressor screw rotor according to claim 1, characterized in that: A fixing plate (4) is fixedly sleeved on the outer side wall of the upper mold (5), and the fixing plate (4) is fixed on the mold frame (19).

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