Steering gear housing mold and method of use

Abstract

This invention discloses a steering gear housing mold and its usage method, relating to the field of mold technology. It includes a lower mold and an upper mold. A movable plate is slidably disposed on the inner side of the lower mold, and a lifting assembly is disposed on the movable plate. The lifting assembly includes a threaded ring movably connected to the inner side of the lower mold, a movable ring slidably disposed on the outer side of the threaded ring, a spring jointly installed between the movable ring and the lower mold, a movable rod slidably disposed on the upper part of the movable ring, a push rod slidably disposed on the upper part of the movable rod, a memory spring jointly installed between the push rod and the movable rod, and a locking unit jointly disposed between the movable ring and the movable rod. Rotation of the threaded ring causes the movable ring to move downwards and compresses the spring, while the height of the movable rod remains unchanged. This invention uses a lifting assembly; rotating the threaded ring causes the movable ring to move downwards, compressing the spring. By changing the spring force coefficient, the ejection force of the push rod is changed. Different ejection forces are set according to different positions of the housing, which can eliminate bending moment and prevent the housing from bending and deforming.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a steering gear housing mold and its usage method. Background Technology

[0002] The steering gear is the core component of the car steering system. It is responsible for converting the rotational motion of the steering wheel into the oscillation of the wheels, while also achieving deceleration and torque increase. The steering gear housing is the outer shell that encloses the internal gears and racks. It is usually made of aluminum alloy and has oil passages, mounting holes, flanges, etc. The steering gear housing mold is a special forming tool used for mass casting production of steering gear housings.

[0003] In traditional steering gear housing molds, the ejector cylinder directly pushes the ejector rods for main ejection after the casting has completely cooled. At this time, there is a large static friction between the casting and the mold core. The ejection system needs to apply a large force to overcome this resistance. Since the ejection force is applied instantaneously, once the static friction is overcome, the casting will suddenly pop out, generating an impact. This will cause local stress concentration in the housing, resulting in microcracks. Furthermore, all ejector rods have the same ejection force, which cannot match the distribution of clamping force. The clamping force at the flange end is large. If the ejection force is insufficient, it will easily lead to demolding difficulties. The clamping force at the deep hole end is small. If the ejection force is excessive, it will easily lead to demolding first, resulting in bending deformation of the housing. Therefore, a steering gear housing mold and its usage method are proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art, such as the ejection force being applied instantaneously, causing the casting to suddenly pop out and generate impact, which leads to local stress concentration in the shell and the generation of microcracks; all ejector rods having the same ejection force, making it impossible to match the clamping force distribution; and the shell bending and deforming after demolding. Therefore, this invention proposes a steering gear shell mold and its usage method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steering gear housing mold includes a lower mold and an upper mold. A movable plate is slidably disposed on the inner side of the lower mold, and a lifting assembly is disposed on the movable plate. The lifting assembly includes a threaded ring movably connected to the inner side of the lower mold, a movable ring slidably disposed on the outer side of the threaded ring, a spring jointly installed between the movable ring and the lower mold, a movable rod slidably disposed on the upper part of the movable ring, a push rod slidably disposed on the upper part of the movable rod, a memory spring jointly installed between the push rod and the movable rod, and a locking unit jointly disposed between the movable ring and the movable rod. The ejection force of the push rod is changed by changing the spring force coefficient. Different ejection forces are set according to different positions of the housing to eliminate bending moment and avoid bending deformation of the housing. The rotation of the threaded ring causes the movable ring to move down and the spring to contract. The height of the movable rod remains unchanged. The memory spring expands and contracts with temperature changes. After the housing temperature decreases, the memory spring temperature decreases and expands. The pre-ejection force of the memory spring after expansion is small, which just breaks the initial adhesion between the casting and the mold core, avoiding impact and deformation caused by adhesion during the main ejection.

[0007] The above technical solution further includes:

[0008] The lower mold has a cavity on its inner side, and multiple guide rods are installed on the inner side of the cavity. A movable plate is slidably arranged on the outer side of the multiple guide rods. A cylinder is installed at the bottom of the inner side of the cavity. The output end of the cylinder is fixedly connected to the bottom of the movable plate. Activating the cylinder drives the movable plate to move upward along the multiple guide rods.

[0009] The inner side of the movable plate has multiple circular grooves, and a threaded rod is installed on the inner side of the circular groove. The threaded ring and the threaded rod are threadedly connected.

[0010] A limiting ring is installed on the outer side of the threaded ring, and the limiting ring limits the upward movement of the movable ring.

[0011] A square rod is installed at the bottom of the movable rod. The square rod is slidably connected to the movable ring. When the threaded ring drives the movable ring to move down, the square rod slides inside the movable ring.

[0012] The locking unit includes a square groove on the inner side of a square rod, a telescopic rod installed on the inner side of the square groove, a movable block installed at the end of the telescopic rod, the movable block being slidably connected to the square groove, a square plate installed on the upper part of the movable ring, and multiple fixed grooves on the inner side of the square plate being movably connected to the movable block, thereby locking the movable ring and movable rod after the spacing is changed.

[0013] The cross-section of the movable block is trapezoidal, and when the movable ring moves, the edge of the fixed groove and the inclined surface of the movable block are pressed against each other.

[0014] A round rod is installed on the side of the movable block near the telescopic rod. The round rod is slidably connected to the square rod. A pull plate is installed at the other end of the round rod. Pulling up the pull plate and moving the movable block to the outside of the fixed groove through the round rod can release the locking of the movable ring and the movable rod.

[0015] Multiple cylinders are installed inside the cavity, and a circular plate is installed outside the movable rod. The cylinders limit the downward movement of the circular plate.

[0016] A method for using a steering gear housing mold, comprising the following steps:

[0017] Step 1: Pour the solution through the opening in the upper mold into the cavity between the lower and upper molds. After the shell is formed, move the upper mold upwards and separate it from the lower mold.

[0018] Step 2: After the upper mold and lower mold separate, the shell temperature decreases, the memory spring temperature decreases and expands, driving the ejector pin to pre-lift the shell;

[0019] Step 3: Rotating the threaded ring causes the movable ring to move downward, changing the spring force coefficient and altering the force with which the push rod lifts the housing. The movable plate moves upward, causing multiple push rods to lift the housing with varying forces.

[0020] The present invention has the following beneficial effects: 1. In this invention, after the shell temperature decreases, the memory spring temperature decreases and it expands. The pre-ejection force of the memory spring after expansion is small, which just breaks the initial adhesion between the casting and the mold core, avoiding the impact and deformation caused by adhesion during the main ejection. 2. In this invention, by setting up a lifting assembly, rotating the threaded ring causes the movable ring to move down to compress the spring. The lifting force of the lifting rod can be changed by changing the spring force coefficient. Different lifting forces can be set according to different positions of the shell to eliminate bending moment and avoid shell bending deformation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a steering gear housing mold and its usage method proposed in this invention;

[0022] Figure 2 This is a schematic diagram of the lower mold structure in this invention;

[0023] Figure 3 This is a schematic diagram of the interior of the lower mold in this invention;

[0024] Figure 4 This is a schematic diagram of the side cross-sectional structure of the lower mold in this invention;

[0025] Figure 5 for Figure 4Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point B;

[0027] Figure 7 for Figure 4 Enlarged schematic diagram of the structure at point C.

[0028] In the diagram: 1. Lower mold; 2. Upper mold; 3. Cavity; 4. Guide rod; 5. Movable plate; 6. Cylinder; 7. Circular groove; 8. Threaded rod; 9. Threaded ring; 10. Square plate; 11. Limiting ring; 12. Movable ring; 13. Spring; 14. Square rod; 15. Movable rod; 16. Circular plate; 17. Cylinder; 18. Memory spring; 19. Push rod; 20. Square groove; 21. Telescopic rod; 22. Movable block; 23. Square plate; 24. Fixed groove; 25. Circular rod; 26. Pull plate. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figure 1 - Figure 7 As shown, the present invention proposes a steering gear housing mold and its usage method, including a lower mold 1 and an upper mold 2. A movable plate 5 is slidably disposed on the inner side of the lower mold 1. A lifting assembly is disposed on the movable plate 5. The lifting assembly includes a threaded ring 9 movably connected to the inner side of the lower mold 1, a movable ring 12 slidably disposed on the outer side of the threaded ring 9, a spring 13 jointly installed between the movable ring 12 and the lower mold 1, a movable rod 15 slidably disposed on the upper part of the movable ring 12, a push rod 19 slidably disposed on the upper part of the movable rod 15, a memory spring 18 jointly installed between the push rod 19 and the movable rod 15, and a locking unit jointly disposed between the movable ring 12 and the movable rod 15. The lifting assembly allows for adjustment of the spring 13. The ejection force of the push rod 19 is changed by adjusting the elastic coefficient. Different ejection forces are set according to different positions of the shell to eliminate bending moment and avoid shell bending deformation. The rotation of the threaded ring 9 drives the movable ring 12 to move down and causes the spring 13 to contract. The height of the movable rod 15 remains unchanged. The memory spring 18 expands and contracts with temperature changes. After the shell temperature decreases, the temperature of the memory spring 18 decreases and it expands. The pre-ejection force of the memory spring 18 after expansion is small, which just breaks the initial adhesion between the casting and the mold core, avoiding the impact and deformation caused by adhesion during the main ejection.

[0031] The lower mold 1 has a cavity 3 on its inner side. Multiple guide rods 4 are installed on the inner side of the cavity 3. A movable plate 5 is slidably arranged on the outer side of the multiple guide rods 4. A cylinder 6 is installed at the bottom of the inner side of the cavity 3. The output end of the cylinder 6 is fixedly connected to the bottom of the movable plate 5. When the cylinder 6 is activated, it drives the movable plate 5 to move upward along the multiple guide rods 4.

[0032] The inner side of the movable plate 5 is provided with a plurality of circular grooves 7, and a threaded rod 8 is installed on the inner side of the circular grooves 7. The threaded ring 9 is threadedly connected to the threaded rod 8.

[0033] A limiting ring 11 is installed on the outer side of the threaded ring 9, and the limiting ring 11 limits the upward movement of the movable ring 12.

[0034] A square rod 14 is installed at the bottom of the movable rod 15. The square rod 14 is slidably connected to the movable ring 12. When the threaded ring 9 drives the movable ring 12 to move down, the square rod 14 slides inside the movable ring 12.

[0035] The locking unit includes a square groove 20 on the inner side of a square rod 14, a telescopic rod 21 installed on the inner side of the square groove 20, a movable block 22 installed at the end of the telescopic rod 21, the movable block 22 being slidably connected to the square groove 20, a square plate 23 installed on the upper part of the movable ring 12, and a plurality of fixed grooves 24 on the inner side of the square plate 23 being movably connected to the movable block 22, thereby locking the movable ring 12 and the movable rod 15 after the spacing is changed.

[0036] The cross-section of the movable block 22 is trapezoidal, and when the movable ring 12 moves, the edge of the fixed groove 24 is pressed against the inclined surface of the movable block 22.

[0037] A round rod 25 is installed on the side of the movable block 22 near the telescopic rod 21. The round rod 25 is slidably connected to the square rod 14. A pull plate 26 is installed on the other end of the round rod 25. Pulling up the pull plate 26 and moving the movable block 22 to the outside of the fixed groove 24 through the round rod 25 can release the locking of the movable ring 12 and the movable rod 15.

[0038] Multiple cylinders 17 are installed inside the cavity 3, and a circular plate 16 is installed outside the movable rod 15. The cylinders 17 limit the downward movement of the circular plate 16.

[0039] In this embodiment, when the steering gear housing needs to be cast, the solution is poured into the cavity between the lower mold 1 and the upper mold 2 through the opening of the upper mold 2. After the housing is formed, the upper mold 2 moves upward and separates from the lower mold 1. After the upper mold 2 separates from the lower mold 1, the housing temperature decreases, and the memory spring 18 decreases in temperature and expands. Then, it drives the push rod 19 to move upward and pre-lift the housing. Before the casting work, the lifting position of the housing changes the spring force coefficient of the spring 13. The threaded ring 9 is rotated, and the threaded ring 9 moves downward through the limiting ring 11, which drives the movable ring 12 to move downward. When the movable ring 12 moves downward, it drives the spring 13 to contract, thereby changing the spring force coefficient of the spring 13. When the threaded ring 9 drives the movable ring 12 to move downward, the square rod 14 slides inside the movable ring 12. At the same time, the downward direction of the movable rod 15 can be limited by the limiting of the circular plate 16 by the cylinder 17. At the same time, the movable block is fixed by the edge of the fixing groove 24 on the side of the square rod 14. 22 is squeezed, which causes the movable block 22 to retract into the square groove 20. At this time, the telescopic rod 21 retracts. When the movable ring 12 moves to the required position, the telescopic rod 21, which is in the retracted state, drives the movable block 22 to insert into the corresponding fixed groove 24. At this time, the distance between the movable rod 15 and the movable ring 12 is changed, and the position of the movable rod 15 remains unchanged. The cylinder 6 can be activated to drive the movable plate 5 to move upward along the multiple guide rods 4, and at the same time drive the movable rod 15 and the push rod 19 to move upward, so that the push rod 19 passes through 10 to lift the shell. When the push rod 19 lifts the shell, it drives the movable ring 12 to move downward through the movable rod 15. Through the different elasticity of the multiple springs 13, the multiple push rods 19 can have different lifting forces. Since the clamping force is not evenly distributed along the length of the shell, the lifting force of different push rods 19 corresponds one-to-one with the clamping force of the area, which can eliminate bending moment. Theoretically, this is better than uniform output force and improves the separation effect between the shell and the lower mold 1.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steering gear housing mold, comprising a lower mold (1) and an upper mold (2), characterized in that, A movable plate (5) is slidably provided on the inner side of the lower mold (1). A lifting assembly is provided on the movable plate (5). The lifting assembly includes a threaded ring (9) movably connected to the inner side of the lower mold (1), a movable ring (12) slidably provided on the outer side of the threaded ring (9), a spring (13) jointly installed between the movable ring (12) and the lower mold (1), a movable rod (15) slidably provided on the upper part of the movable ring (12), a top rod (19) slidably provided on the upper part of the movable rod (15), a memory spring (18) jointly installed between the top rod (19) and the movable rod (15), and a locking unit jointly provided between the movable ring (12) and the movable rod (15). The rotation of the threaded ring (9) drives the movable ring (12) to move down and causes the spring (13) to contract. The height of the movable rod (15) remains unchanged. The memory spring (18) expands and contracts due to temperature changes.

2. The steering gear housing mold according to claim 1, characterized in that, The lower mold (1) has a cavity (3) on its inner side. Multiple guide rods (4) are installed on the inner side of the cavity (3). A movable plate (5) is slidably arranged on the outer side of the multiple guide rods (4). A cylinder (6) is installed at the bottom of the inner side of the cavity (3). The output end of the cylinder (6) is fixedly connected to the bottom of the movable plate (5).

3. A steering gear housing mold according to claim 1, characterized in that, The inner side of the movable plate (5) is provided with a plurality of circular grooves (7), and a threaded rod (8) is installed on the inner side of the circular grooves (7). The threaded ring (9) is threadedly connected to the threaded rod (8).

4. A steering gear housing mold according to claim 1, characterized in that, A limiting ring (11) is installed on the outer side of the threaded ring (9), and the limiting ring (11) limits the upward movement direction of the movable ring (12).

5. A steering gear housing mold according to claim 1, characterized in that, A square rod (14) is installed at the bottom of the movable rod (15), and the square rod (14) is slidably connected to the movable ring (12).

6. A steering gear housing mold according to claim 5, characterized in that, The locking unit includes a square groove (20) on the inner side of a square rod (14), a telescopic rod (21) installed on the inner side of the square groove (20), a movable block (22) installed at the end of the telescopic rod (21), the movable block (22) and the square groove (20) being slidably connected, a square plate (23) installed on the upper part of the movable ring (12), a plurality of fixed grooves (24) on the inner side of the square plate (23), and the fixed grooves (24) and the movable block (22) being movably connected.

7. A steering gear housing mold according to claim 6, characterized in that, The cross-section of the movable block (22) is trapezoidal, and when the movable ring (12) moves, the edge of the fixed groove (24) and the inclined surface of the movable block (22) are pressed against each other.

8. A steering gear housing mold according to claim 7, characterized in that, A round rod (25) is installed on the side of the movable block (22) near the telescopic rod (21). The round rod (25) is slidably connected to the square rod (14). A pull plate (26) is installed at the other end of the round rod (25).

9. A steering gear housing mold according to claim 2, characterized in that, Multiple cylinders (17) are installed on the inner side of the cavity (3), and a circular plate (16) is installed on the outer side of the movable rod (15). The cylinders (17) limit the downward movement of the circular plate (16).

10. A method of using a steering gear housing mold, comprising the steering gear housing mold as described in claim 1, characterized in that, Includes the following steps: Step 1: Pour the solution through the opening of the upper mold (2) into the cavity between the lower mold (1) and the upper mold (2). After the shell is formed, move the upper mold (2) upward and separate it from the lower mold (1): Step 2: After the upper mold (2) and the lower mold (1) separate, the shell temperature decreases, the memory spring (18) temperature decreases and expands, driving the push rod (19) to pre-push up the shell; Step 3: Rotating the threaded ring (9) causes the movable ring (12) to move down, changing the elastic coefficient of the spring (13) and changing the force of the push rod (19) on the housing. The movable plate (5) moves up, causing multiple push rods (19) to lift the housing with different forces.

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