Hydraulic shaping process for large nozzle ring

Abstract

The invention relates to the technical field of nozzle ring machining, and particularly provides a large nozzle ring hydraulic shaping process which comprises the following steps: A1, pretreating a nozzle ring; a2, the nozzle ring is heated and subjected to heat preservation; a3, a mold of the shaping tool is preheated; a4, the nozzle ring is put into a shaping tool to be shaped after being taken out of the furnace; a5, equipment is started, the upper die body is pressed downwards, and after compaction is conducted for 5-7 s under the pressure of 1-1.5 Mpa, the upper die body is opened to the starting position; a6, the equipment is started again, the upper die body is pressed downwards, the secondary compaction pressure is 1-1.5 Mpa, the pressure maintaining time is 120-130 S, and the nozzle ring is taken out after the temperature of the nozzle ring is reduced to 290-310 DEG C; and A7, after the nozzle ring is shaped and taken out, the nozzle ring is cooled to 25 DEG C or below at the room temperature, and shot blasting treatment is conducted. According to the process, it can be ensured that the size and shape of the nozzle ring meet the design requirements, the qualified rate of products is increased, and various properties of the nozzle ring can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of nozzle ring processing, and specifically provides a hydraulic shaping process for a large nozzle ring. Background Art

[0002] With the in-depth development of the automobile industry, the requirements for fuel consumption and emissions are increasingly valued by the business community, and the advantages of superchargers in terms of emissions and fuel consumption are gradually being recognized by people as the scope of use expands. Various OEMs are also developing their own supercharged engines. The nozzle ring is a key component in the turbocharger, which is used to control the amount of air intake from the volute into the turbocharger.

[0003] The design of the nozzle ring requires certain precision in shape and size, and also requires fairly high mechanical properties. In these cases, the shape and strength of the nozzle ring need to be further adjusted and optimized. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention provides a large nozzle ring hydraulic shaping process, the purpose of which is to further adjust and optimize the shape of the nozzle ring and improve various performances of the nozzle ring.

[0005] In order to achieve the above object, the present invention provides a large nozzle ring hydraulic shaping process, which includes the following steps: A1: Pre-treat the nozzle ring surface; A2: Place the nozzle ring in a heating furnace and heat it, then keep it warm. The heating rate is 400℃ / h, and the temperature is heated to 840℃~860℃. The holding time is 0.5h~1h. A3: Preheat the mold to 290℃~310℃; A4: After the nozzle ring is taken out of the furnace, it is placed in the shaping tool for shaping, and the transfer time is less than 20s; A5: Start the equipment and slowly press the upper mold down at a uniform speed. After compacting for 5S-7S at a pressure of 1Mpa-1.5Mpa, open the upper mold to the starting position; A6: Start the equipment again, and slowly press the upper mold body downward at a uniform speed. The secondary compaction pressure is 1Mpa-1.5Mpa, and the holding time is 120S-130S. Wait until the nozzle ring temperature drops to 290℃~310℃ before taking it out. A7: After the nozzle ring is shaped and taken out, it is cooled to below 25°C at room temperature and shot blasted; The shaping tooling includes a frame, which includes a bottom frame and a top frame, and the bottom frame and the top frame are jointly fixed with two columns. A first hydraulic cylinder is fixed on the top frame, and the first hydraulic cylinder is drivingly connected to the first shaping plate, and the first shaping plate is movably connected to the frame. An upper mold body of the mold is fixed on the first shaping plate, and the upper mold body can be covered with a lower mold body. The lower mold body is installed on the bottom frame through a support seat, and an upper groove is provided on the lower end surface of the upper mold body, and a lower groove is provided on the upper end surface of the lower mold body.

[0006] Preferably, the first shaping plate is fixedly connected to the second shaping plate through a plurality of first springs, the second shaping plate is fixedly connected to the first hydraulic cylinder, the first shaping plate and the second shaping plate are movably connected to the frame, one end of a plurality of guide columns is fixed on the first shaping plate, and the other end of the guide column can extend into the second shaping plate and slideably cooperate with it.

[0007] Preferably, two circular guide rails are fixed to the side walls of the column, and the sliding sleeves on the outer walls of the circular guide rails are provided with a first sliding sleeve and a second sliding sleeve, the first sliding sleeve is fixedly connected to the first shaping plate, and the second sliding sleeve is fixedly connected to the second shaping plate.

[0008] Preferably, a second hydraulic cylinder is fixed on the base frame, and the second hydraulic cylinder is fixedly connected to the spring seat, and one end of a plurality of material return rods is fixed on the spring seat, and the outer wall of each material return rod is sleeved with a second spring, and the two ends of the second spring respectively abut the spring seat and the support seat, and the other end of the material return rod passes through the support seat and the lower mold body in sequence and is fixedly connected to a material return ring, and the material return ring is movably arranged in the lower mold body.

[0009] The object of the present invention is to provide a large nozzle ring hydraulic shaping process, which has the following beneficial effects: 1. By heating the nozzle ring at a specific temperature, the nozzle ring can reach the phase change temperature, thereby improving the plasticity of the nozzle ring, making it easy to undergo micro-deformation, while being able to fully release the stress inside the nozzle ring, ensuring that the nozzle ring will not produce stress deformation or crack defects during subsequent processing and use.

[0010] 2. By using a hydraulically driven mold, the shaping process is made more efficient. The shaping process ensures that the size and shape of the nozzle ring meet the design requirements, improves the product qualification rate, and at the same time enhances the shear strength and impact resistance between the nozzle ring blades and the ring body.

[0011] 3. Preheating the mold can ensure that the nozzle ring will not deform the matrix structure due to sudden cooling, resulting in reduced toughness and brittleness; subsequent cooling in the mold can ensure that the nozzle ring can release stress and achieve shaping after shaping. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a shaping tool; Figure 2 It is the axonometric view of the upper mold body; Figure 3 It is the axonometric view of the lower mold body; Figure 4 It is a schematic diagram of the interior of the lower mold body.

[0013] In the figure: 10- bottom frame, 11- top frame, 12- column, 13- base, 14- reinforcing bracket; 20-first hydraulic cylinder, 21-first shaping plate, 22-upper mold body, 23-lower mold body, 24-upper groove, 25-lower groove; 30-support seat; 40-first spring, 41-second shaping plate, 42-guide column; 50-circular guide rail, 51-first sliding sleeve, 52-second sliding sleeve; 60-second hydraulic cylinder, 61-spring seat, 62-removal rod, 63-second spring, 64-removal ring. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] A large nozzle ring hydraulic shaping process is mainly used to fine-tune the shape of the integrally cast nozzle ring and the accuracy of the blade direction, including the following steps: A1: Pre-treat the nozzle ring surface, remove burrs and burrs, and ensure the surface is clean and smooth.

[0016] A2: Place the nozzle ring neatly in the heating furnace, heat to 850℃±10℃ at a heating rate of 400℃ / h, and then keep warm for 0.5h~1h; A3: Pre-treat the mold, clean the upper and lower mold bodies, blow away any debris on the mold surface, and then preheat the mold to 300℃±10℃ for standby use; A4: The nozzle ring is transported from the heating furnace to the shaping tooling, and the transfer time is less than 20s to prevent excessive loss of temperature; A5: Start the equipment and slowly press the upper mold down at a uniform speed. After compacting for 5S-7S at a pressure of 1Mpa-1.5Mpa, open the upper mold to the starting position to release the stress of the nozzle ring. A6: Start the equipment again, and slowly press the upper mold body downward at a uniform speed. The secondary compaction pressure is 1Mpa-1.5Mpa, and the holding time is 120S-130S. Wait until the nozzle ring temperature drops to 300℃±10℃ before taking it out; A7: After the nozzle ring is shaped and taken out, it is cooled to below 25°C at room temperature and shot blasted.

[0017] As a further explanation of this embodiment, Figure 1-4 As shown, the shaping tool used for shaping the nozzle ring includes a frame, which includes two vertically arranged columns 12, the two columns 12 are jointly fixed with a bottom frame 10 near the lower position, and the top of the two columns 12 is jointly fixed with a top frame 11. A first hydraulic cylinder 20 is fixed below the top frame 11, and the push rod of the first hydraulic cylinder 20 is set upside down. The first hydraulic cylinder 20 is drivingly connected to the first shaping plate 21, and the first shaping plate 21 is movably connected to the frame. An upper mold body 22 is fixed on the first shaping plate 21, and the upper mold body 22 can cover the lower mold body 23. The lower mold body 23 is fixedly mounted on a support seat 30, and the support seat 30 is fixedly mounted on the bottom frame 10. An upper groove 24 is provided on the lower end surface of the upper mold body 22, and a lower groove 25 is provided on the upper end surface of the lower mold body 23. After the upper mold body 22 and the lower mold body 23 are matched, the upper groove 24 and the lower groove 25 enclose a cavity for shaping the nozzle ring.

[0018] The frame also includes a base 13 fixed at the bottom ends of the two columns 12. The base 13 has a large horizontal area, which can increase the contact area between the device and the ground and increase the stability of the device.

[0019] As a further explanation of this embodiment, one end of a plurality of first springs 40 is fixed to the upper end surface of the first shaping plate 21, and the other end of the plurality of first springs 40 is fixedly connected to the second shaping plate 41, and the second shaping plate 41 is fixed to the push head of the first hydraulic cylinder 20. The first shaping plate 21 and the second shaping plate 41 are movably connected to the column 12 of the frame, and one end of a plurality of guide columns 42 is fixed to the first shaping plate 21, and the other end of the guide column 42 can extend into the second shaping plate 41 and slide with it. The specific method is: a plurality of guide grooves are opened at the bottom end of the second shaping plate 41, and the guide grooves coincide with the vertical projections of the guide columns 42, and the guide columns 42 are over-matched with the guide grooves, and the guide columns 42 can be arranged in the guide grooves and move along them.

[0020] Among them, the head of the first hydraulic cylinder 20 is fixedly connected to the reinforcing bracket 14, and the reinforcing bracket 14 is fixedly connected to the top frame 11. The reinforcement bracket 14 can prevent the first hydraulic cylinder 20 from tilting due to its own reverse thrust, thereby increasing the stability of the first hydraulic cylinder 20 during movement.

[0021] As a further explanation of this embodiment, two circular guide rails 50 are fixed to the side walls of each column 12, with a total of four circular guide rails 50. The outer wall sliding sleeves of the four circular guide rails 50 are provided with a first sliding sleeve 51 and a second sliding sleeve 52. The first sliding sleeve 51 is fixedly connected to the second shaping plate 41, and the second sliding sleeve 52 is fixedly connected to the first shaping plate 21.

[0022] As a further explanation of this embodiment, a second hydraulic cylinder 60 is fixed on the base frame 10, and the head of the second hydraulic cylinder 60 is vertically arranged upward. The push rod of the second hydraulic cylinder 60 is fixedly connected to the spring seat 61, and one end of a plurality of material removal rods 62 is fixed on the spring seat 61. The outer wall of each material removal rod 62 is sleeved with a second spring 63, and the bottom end of the second spring 63 abuts against the upper end surface of the spring seat 61, and the top end of the second spring 63 abuts against the lower end surface of the support seat 30. The other end of the material removal rod 62 passes through the support seat 30 and the lower mold body 23 in sequence and is fixedly connected to the material removal ring 64, and the material removal ring 64 is movably arranged in the lower mold body 23.

[0023] When using the shaping tool, first place the nozzle ring to be shaped into the lower groove 25, and then start the first hydraulic cylinder 20. The first hydraulic cylinder 20 pushes the second shaping plate 41 to move downward, thereby driving the first shaping plate 21 to move downward, and the upper mold body 22 fixed on the first shaping plate 21 moves downward accordingly and mates with the lower mold body 23. Then the second shaping plate 41 continues to move downward, and the upper mold body 22 no longer moves downward because it is blocked by the lower mold body 23. At this time, the first spring 40 between the first shaping plate 21 and the second shaping plate 41 will be compressed to store elastic potential energy to prevent the upper mold body 22 from continuing to move downward.

[0024] After the shaping of the nozzle ring is completed, the first hydraulic cylinder 20 drives the second shaping plate 41 to move upward, thereby driving the first shaping plate 21 and the upper mold body 22 to move upward. After the push head of the first hydraulic cylinder 20 is reset, the second hydraulic cylinder 60 is started, and the push head of the second hydraulic cylinder 60 moves upward, pushing the spring seat 61 upward. The stripping rod 62 on the spring seat 61 drives the stripping ring 64 to move upward, and the processed nozzle ring is pushed out of the lower mold body 23. At this time, the second spring 63 is compressed to store elastic potential energy. After the nozzle ring is completely ejected, the second hydraulic cylinder 60 is reset, driving the stripping rod 62 and the stripping ring 64 to reset.

[0025] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A large nozzle ring hydraulic shaping process, characterized in that: The steps include: A1: Pre-treat the nozzle ring surface; A2: Place the nozzle ring in a heating furnace and heat it, then keep it warm. The heating rate is 400℃ / h, and the temperature is heated to 840℃~860℃. The holding time is 0.5h~1h. A3: Preheat the mold of the shaping tooling to a temperature of 290°C~310°C; A4: After the nozzle ring is taken out of the furnace, it is placed in the shaping tool for shaping, and the transfer time is less than 20s; A5: Start the equipment and slowly press the upper mold down at a uniform speed. After compacting for 5S-7S at a pressure of 1Mpa-1.5Mpa, open the upper mold to the starting position; A6: Start the equipment again, and press the upper mold body down slowly and evenly. The secondary compaction pressure is 1Mpa-1.5Mpa, and the holding time is 120S-130S. Wait until the nozzle ring temperature drops to 290℃~310℃ before taking it out; A7: After the nozzle ring is shaped and taken out, it is cooled to below 25°C at room temperature and shot blasted; The shaping tool comprises a frame, the frame comprises a bottom frame (10) and a top frame (11), the bottom frame (10) and the top frame (11) are jointly fixed with two uprights (12), a first hydraulic cylinder (20) is fixed on the top frame (11), the first hydraulic cylinder (20) is drivingly connected to a first shaping plate (21), the first shaping plate (21) is movably connected to the frame, an upper mold body (22) of a mold is fixed on the first shaping plate (21), the upper mold body (22) can cover a lower mold body (23), the lower mold body (23) is mounted on the bottom frame (10) via a support seat (30), an upper groove (24) is provided on the lower end surface of the upper mold body (22), a lower groove (25) is provided on the upper end surface of the lower mold body (23), and the upper groove (24) matches the lower groove (25).

2. The large nozzle ring hydraulic shaping process according to claim 1, characterized in that: The first shaping plate (21) is fixedly connected to the second shaping plate (41) via a plurality of first springs (40), the second shaping plate (41) is fixedly connected to the first hydraulic cylinder (20), the first shaping plate (21) and the second shaping plate (41) are both movably connected to the frame, one end of a plurality of guide columns (42) is fixed to the first shaping plate (21), the other end of the guide column (42) can extend into the second shaping plate (41) and slidably cooperate with the second shaping plate (41), and the first spring (40) is sleeved on the outside of the guide column (42).

3. The large nozzle ring hydraulic shaping process according to claim 2, characterized in that: Two circular guide rails (50) are fixed to the side walls of the upright column (12); a first sliding sleeve (51) and a second sliding sleeve (52) are provided on the outer wall sliding sleeve of the circular guide rail (50); the second sliding sleeve (52) is fixedly connected to the first shaping plate (21); and the first sliding sleeve (51) is fixedly connected to the second shaping plate (41).

4. The large nozzle ring hydraulic shaping process according to claim 3 is characterized in that: A second hydraulic cylinder (60) is fixed on the base frame (10), the second hydraulic cylinder (60) is fixedly connected to a spring seat (61), a plurality of material return rods (62) are fixed on the spring seat (61), a second spring (63) is sleeved on the outer wall of each material return rod (62), two ends of the second spring (63) respectively abut against the spring seat (61) and the support seat (30), one end of the material return rod (62) passes through the support seat (30) and the lower mold body (23) in sequence and is fixedly connected to a material return ring (64), and the material return ring (64) is movably arranged in the lower mold body (23).

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