A forming die for an active hydraulic suspension bushing of an automobile

Abstract

The application discloses a forming die for an automobile active hydraulic suspension bushing, and relates to the technical field of automobile accessory die, which comprises a lower die, the top surface of the lower die is provided with a middle die, the top surface of the middle die is provided with an upper die, the top surface of the lower die and the bottom surface of the upper die are both provided with a plurality of forming cavities, and the top surface of the middle die is provided with a plurality of positioning cavities; the temperature sensor, the lower die, the middle die, the upper die, the thick film heating sheet, the heat preservation sleeve one, the heat preservation sleeve two and the heat preservation sleeve are mutually matched, the highest average temperature in the three dies is taken as a threshold value, the other two dies are heated to be close to the threshold value by the thick film heating sheet, the heat preservation sleeve one, the heat preservation sleeve two and the heat preservation sleeve three can reduce the temperature loss of the lower die, the middle die and the upper die, improve the temperature control effect, and prevent the shell body and the inner framework from being expanded to different degrees at different positions due to the lower die, the middle die and the upper die with different temperatures.

Description

Technical Field

[0001] This invention relates to the field of automotive parts mold technology, specifically to a molding mold for automotive active hydraulic suspension bushings. Background Technology

[0002] Active hydraulic mount bushings are engine mount systems that combine hydraulic damping and active control technologies to isolate engine vibration, reduce NVH (noise, vibration, and harshness), and improve vehicle handling. Their core principle is to absorb vibration energy through fluid movement within hydraulic chambers (such as throttle orifices and inertial channels), while the electronic control unit (ECU) dynamically adjusts damping characteristics to adapt to different operating conditions (such as idling, acceleration, and deceleration). Different hydraulic channels are designed for low-frequency and high-frequency engine vibrations to achieve wide-band vibration reduction. Active hydraulic mount bushings represent a significant breakthrough in automotive NVH technology. Their dynamic adaptability, wide-band vibration reduction capabilities, and compatibility with electrification make them a core component of high-end models and new energy vehicles. With advancements in materials and control technologies, their costs will gradually decrease, and their application scope is expected to further expand.

[0003] Extensive research revealed a problem with existing molds. During the initial injection, the rubber first flushes against and adheres tightly to the upper mold, which is in direct contact with the high-temperature rubber, causing a rapid temperature rise. As the rubber flows downward through narrow venting channels and cavity gaps, it continuously releases heat to the surrounding metal. By the time it reaches the middle mold, its temperature has decreased, resulting in a relatively lower temperature. Furthermore, the temperature drops further upon reaching the lower mold. This leads to significant temperature differences between the upper, middle, and lower molds after the initial injection. When multiple sets of active hydraulic suspension bushings and their inner frames are placed between the three molds, the temperature variations can cause different expansion rates in the outer and inner frames. This inconsistency in the contraction and expansion of the outer and inner frames results in bushings that are either too tight or too loose, leading to poor molding.

[0004] Therefore, based on the above-mentioned search and combined with existing technologies, a molding die for automotive active hydraulic suspension bushings is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a molding die for automotive active hydraulic suspension bushings to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A molding die for an active hydraulic suspension bushing for automobiles includes: a lower die, a middle die on the top surface of the lower die, an upper die on the top surface of the middle die, a plurality of molding cavities on the top surface of the lower die and the bottom surface of the upper die, a plurality of positioning cavities on the top surface of the middle die, and a plurality of injection holes on the top surface of the upper die, wherein every three injection holes are arranged in a triangular shape and connected to the molding cavities on the bottom surface of the upper die;

[0008] A temperature control mechanism is provided on the outside of the lower mold to reduce the temperature of the lower mold, the middle mold, and the upper mold.

[0009] The temperature control mechanism includes a heat insulation sleeve 1, which is fixedly fitted onto the outside of the lower mold. A heat insulation sleeve 2 is fixedly fitted onto the outside of the middle mold, and a heat insulation sleeve 3 is fixedly fitted onto the outside of the upper mold. The heat insulation sleeves 1, 2, and 3 are used to reduce heat loss. Several thick-film heating elements are embedded on the front and rear sides of the heat insulation sleeves 1, 2, and 3. Several temperature sensors are embedded on the top surface of the lower mold, the top surface of the middle mold, and the bottom surface of the upper mold. The temperature of the lower mold, the middle mold, and the upper mold is detected by the multiple temperature sensors. The temperature of the lower mold, the middle mold, and the upper mold is brought closer together by the heating of the multiple thick-film heating elements. The temperature control mechanism also includes a quick-replacement component and an auxiliary pressing component.

[0010] A connecting mechanism is disposed on the top surface of the lower mold and is used to connect the lower mold and the upper mold.

[0011] Furthermore, the quick-replacement component includes six support plates, with each pair of support plates positioned on the front and rear sides of the lower mold, the middle mold, and the upper mold, respectively. Support frames are fixedly installed on both sides of the lower mold, the middle mold, and the upper mold. A transmission rod one is fixedly installed on one side of each support plate. Two movable support blocks are fixedly installed on one side of the inner side of each support plate. Transmission rod two is rotatably connected to the adjacent sides of the two movable support blocks. The front end of transmission rod two is rotatably connected to the rear end of transmission rod one. A support base is fixedly installed on the inner top surface of the support plate. An L-shaped rotating rod is rotatably connected to the top surface of the support base. Transmission rod three is rotatably connected to the top and bottom surfaces of the L-shaped rotating rod. The left end of transmission rod three is coaxially connected to the front end of transmission rod two.

[0012] Furthermore, the auxiliary pressing component includes positioning brackets, and a total of twelve positioning brackets are provided. Every two positioning brackets form a group, which are respectively fixedly installed on the front and rear sides of the lower mold, the middle mold and the upper mold. A sliding column is connected through the front side of the positioning bracket, and a pressure block is fixedly installed at the rear end of the sliding column. A spring is movably sleeved on the outer circular wall of the sliding column.

[0013] Furthermore, a limiting bracket is fixedly installed on the right side of the support frame. Two sliding grooves are formed on the top surface of the limiting bracket. A limiting block is connected to the inside of the sliding groove by a spring. One side of the limiting block is inclined.

[0014] Furthermore, a spiral groove is provided on the bottom surface of the lower mold, and a magnetizing coil is fixedly sleeved inside the spiral groove.

[0015] Furthermore, the connecting mechanism includes several positioning bases, all of which are fixedly installed on the top surface of the lower mold. A connecting groove is formed on the top surface of each positioning base. A support ring is fixedly installed inside the connecting groove. A connecting column is slidably connected to the inner circular wall of the support ring. A movable stop is fixedly installed on the bottom surface of the connecting column. A connecting chamber is fixedly installed on the top surface of the connecting column. A spring is movably sleeved on the outer circular wall of the connecting column. A pressure sensor is fixedly installed on the bottom surface of the connecting groove. Several connecting bases are fixedly installed on the bottom surface of the upper mold. A connecting latch is fixedly installed on the bottom surface of each connecting base, and the connecting latch is movably engaged with the connecting groove.

[0016] Furthermore, a limiting groove is provided on the top surface of the support frame, a limiting rod is fixedly installed inside the limiting groove, a sliding support block is slidably connected to the outer circular wall of the limiting rod, and the front side of the sliding support block is fixedly connected to the rear side of the support pressure plate.

[0017] Furthermore, several mounting brackets are fixedly installed on the bottom surface of the lower mold, and two fixing holes are opened on the inner bottom surface of the mounting brackets.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By cooperating with the lower mold, injection hole, molding cavity, middle mold and upper mold, the active hydraulic suspension bushing of automobiles can be formed;

[0020] By using temperature sensors, lower mold, middle mold, upper mold, thick film heating element, insulation sleeve one, insulation sleeve two, and insulation sleeve in coordination, the highest average temperature among the three molds can be used as a threshold. The thick film heating element can then heat the other two molds to approximately this threshold. Insulation sleeve one, insulation sleeve two, and insulation sleeve three can reduce the temperature loss of the lower mold, middle mold, and upper mold, minimize temperature changes on the lower mold, middle mold, and upper mold, improve temperature control, and prevent the outer shell and inner frame from expanding to different degrees at different locations due to the different temperatures of the lower mold, middle mold, and upper mold.

[0021] By using a combination of thick-film heating elements, a lower mold, a middle mold, an upper mold, an L-shaped rotating rod, a support base, a transmission rod three, two transmission rods two, a transmission rod one, and a support pressure plate, aged thick-film heating elements can be replaced in a timely manner. This prevents large temperature differences between the lower mold, middle mold, and upper mold caused by the aging of the thick-film heating elements, achieving temperature control for the lower mold, middle mold, and upper mold. This facilitates the production of automotive active hydraulic suspension bushings using the lower mold, middle mold, and upper mold. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection structure between the middle mold and the second insulation sleeve of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection structure between the connecting block and the connecting base of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection structure between the lower mold and the temperature sensor of the present invention;

[0026] Figure 5 This is a bottom view schematic diagram of the connection structure between the support plate and the support frame of the present invention;

[0027] Figure 6 for Figure 5 A magnified schematic diagram of a portion of the structure of B;

[0028] Figure 7 for Figure 4 A partial structural diagram of A in the middle;

[0029] Figure 8 This is a schematic diagram of the connection structure between the limiting block and the sliding groove of the present invention;

[0030] Figure 9 This is a bottom view schematic diagram of the connection structure between the sliding support block and the limiting groove of the present invention;

[0031] Figure 10This is a bottom view schematic diagram of the connection structure between the spiral groove and the magnetizing coil of the present invention.

[0032] In the diagram: 1. Lower mold; 2. Middle mold; 3. Upper mold; 4. Molding cavity; 5. Positioning cavity; 6. Temperature control mechanism; 7. Connecting mechanism; 8. Insulation sleeve one; 9. Insulation sleeve two; 10. Insulation sleeve three; 11. Injection hole; 12. Connecting base; 13. Positioning base; 14. Mounting bracket; 15. Fixing hole; 16. Connecting groove; 17. Connecting chamber; 18. Support ring; 19. Pressure sensor; 20. Connecting column; 21. Spring one; 22. Connecting clip; 23. Support plate; 24. Support frame 25. Thick film heating element; 26. Temperature sensor; 27. Movable support block; 28. Transmission rod one; 29. ​​Transmission rod two; 30. Transmission rod three; 31. L-shaped rotating rod; 32. Support base; 33. Limiting bracket; 34. Limiting block; 35. Positioning bracket; 36. Pressure block; 37. Sliding column; 38. Spring two; 39. Sliding groove; 40. Spring three; 41. Limiting groove; 42. Limiting rod; 43. Sliding support block; 44. Spiral groove; 45. Magnetizing coil; 46. Movable stop block. Detailed Implementation

[0033] 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.

[0034] In one typical implementation of this application, please refer to Figures 1 to 8 A molding die for an active hydraulic suspension bushing for automobiles includes a lower die 1, a middle die 2 on the top surface of the lower die 1, and an upper die 3 on the top surface of the middle die 2. Both the top surface of the lower die 1 and the bottom surface of the upper die 3 have several molding cavities 4. The top surface of the middle die 2 has several positioning cavities 5. The top surface of the upper die 3 has several injection holes 11. Every three injection holes 11 are arranged in a triangular shape and connected to the molding cavities 4 on the bottom surface of the upper die 3. A 0.5mm venting groove is provided around the molding cavity 4 of the upper die 3 to create air pressure balance with the injection holes 11, preventing air bubbles. Every three injection holes 11 have a diameter of 3mm and a spacing of 8mm to ensure that rubber is filled synchronously from three directions, avoiding localized material shortages or air bubbles caused by single-point injection. The inner wall of the injection holes 11 is designed with a 2° taper, an inlet diameter of 3mm, and an outlet diameter of 2.5mm, utilizing a pressure gradient to accelerate rubber flow and shorten filling time.

[0035] The workers place the outer shell and inner skeleton of the active hydraulic suspension bushing inside the molding cavity 4 of the lower mold 1. The workers then put the middle mold 2 and the upper mold 3 onto the lower mold 1. The externally mixed rubber is injected through multiple injection holes 11, which causes the rubber to vulcanize between the outer shell and the inner skeleton, thus realizing the molding of the automotive active hydraulic suspension bushing.

[0036] Temperature control mechanism 6 is located on the outside of the lower mold 1 and is used to reduce the temperature of the lower mold 1, the middle mold 2 and the upper mold 3;

[0037] The temperature control mechanism 6 includes a heat insulation sleeve 1 8, which is fixedly sleeved on the outside of the lower mold 1. A heat insulation sleeve 2 9 is fixedly sleeved on the outside of the middle mold 2, and a heat insulation sleeve 3 10 is fixedly sleeved on the outside of the upper mold 3. The heat insulation sleeves 1 8, 2 9, and 3 10 are used to reduce heat loss. The inner layer of the heat insulation sleeves 1 8, 2 9, and 3 10 is aerogel felt (thermal conductivity 0.018W / m·K), and the outer layer is 304 stainless steel foil (thickness 0.2mm). This provides both heat insulation and protection against mechanical damage. This gives it good heat insulation performance, effectively reducing heat loss from the mold and reducing energy consumption. It also prevents mechanical damage, extends the service life of the heat insulation sleeve, and improves the heat insulation effect.

[0038] Several thick-film heating elements 25 are embedded on the front and rear sides of the insulation sleeve 1 8, insulation sleeve 2 9 and insulation sleeve 3 10. Several temperature sensors 26 are embedded on the top surface of the lower mold 1, the top surface of the middle mold 2 and the bottom surface of the upper mold 3. The temperature of the lower mold 1, the middle mold 2 and the upper mold 3 is detected by multiple temperature sensors 26. The temperature of the lower mold 1, the middle mold 2 and the upper mold 3 is brought closer by the heating of multiple thick-film heating elements 25. The temperature control mechanism 6 also includes a quick replacement part and an auxiliary pressing part. The connecting mechanism 7 is set on the top surface of the lower mold 1 and is used to connect the lower mold 1 and the upper mold 3.

[0039] Among them, the temperature sensor 26 monitors the temperature of each part of the mold in real time and feeds the data back to the control system. The control system controls the heating power of the thick film heating plate 25 according to the set temperature threshold to keep the mold temperature within a suitable range and ensure the quality of rubber vulcanization. At this time, the heat insulation sleeve 1 8, heat insulation sleeve 2 9 and heat insulation sleeve 3 10 reduce heat loss and reduce temperature fluctuation.

[0040] The quick-change parts include support plates 23, of which six are provided. Each pair of support plates 23 is respectively located on the front and rear sides of the lower mold 1, the middle mold 2, and the upper mold 3. Support frames 24 are fixedly installed on both sides of the lower mold 1, the middle mold 2, and the upper mold 3. A transmission rod 28 is fixedly installed on one side of the support plate 23. Two movable support blocks 27 are fixedly installed on one side inside the support plate 23. The two adjacent sides of the two movable support blocks 27 are rotatably connected to a transmission rod 29 via a rotating shaft. The front end of the transmission rod 29 is rotatably connected to the rear end of the transmission rod 28 via a rotating shaft. A support base 32 is fixedly installed on the top surface inside the support plate 23. An L-shaped rotating rod 31 is rotatably connected to the top surface of the support base 32 via a rotating shaft. The top and bottom surfaces of the L-shaped rotating rod 31 are rotatably connected to a transmission rod 30 via a rotating shaft. The left end of the transmission rod 30 is coaxially connected to the front end of the transmission rod 29.

[0041] The L-shaped rotating rod 31, through the linkage of transmission rod 30, transmission rod 29, and transmission rod 28, converts the rotational motion into the linear movement of the support plate 23. When the L-shaped rotating rod 31 is reset, the angle between transmission rod 28 and transmission rod 29 changes from 45° to 90°. At this time, the axial component of transmission rod 29 is zero, and only the radial pressure (≥50N) is retained, ensuring that the thick film heating plate 25 is in long-term contact.

[0042] Using the above-mentioned technical features, through the set lower mold 1, the workers place the outer shell and inner skeleton of multiple sets of active hydraulic suspension bushings inside the multiple molding cavities 4 on the lower mold 1. The external hydraulic equipment drives the middle mold 2 and the lower mold 1 to close. The upper mold 3 also closes with the lower mold 1 and the middle mold 2 under the action of the external hydraulic equipment. The mixed rubber enters the interior of the lower mold 1, the middle mold 2 and the upper mold 3 through multiple injection holes 11. This rubber is vulcanized between the outer shell and the inner skeleton, thereby forming the automotive active hydraulic suspension bushing.

[0043] After the first batch of active hydraulic suspension bushings are formed, the temperatures on the lower mold 1, the middle mold 2 and the upper mold 3 are different. Multiple temperature sensors 26 on the lower mold 1, the middle mold 2 and the upper mold 3 can measure the temperature on the lower mold 1, the middle mold 2 and the upper mold 3 respectively.

[0044] Here, we take the temperature on the lower mold 1 as an example: the temperatures of the four temperature sensors 26 on the lower mold 1 are T1, T2, T3 and T4 respectively, and the average temperature on the lower mold 1 is AT, AT=T1+T2+T3+T4 / 4, thus obtaining the average temperature on the lower mold 1, the middle mold 2 and the upper mold 3;

[0045] By comparing the average temperatures of the lower mold 1, middle mold 2, and upper mold 3, the operator sets the highest average temperature as the threshold. At this time, the temperature of the other two molds is lower than this threshold. The corresponding thick film heating elements 25 on the two molds are activated. The thick film heating elements 25 can heat the molds until the average temperature of the two molds is close to the threshold, thus reducing the temperature difference between the lower mold 1, middle mold 2, and upper mold 3. The insulation sleeves 1-8, 2-9, and 3-10 on the three molds can reduce the temperature loss of the lower mold 1, middle mold 2, and upper mold 3, reduce the temperature change of the lower mold 1, middle mold 2, and upper mold 3, improve the temperature control effect, and prevent the outer shell and inner frame from expanding to different degrees due to the different temperatures of the lower mold 1, middle mold 2, and upper mold 3.

[0046] The thick film heating element 25 is controlled by an external PID controller, ensuring precise temperature control.

[0047] In addition, the thick film heating element 25 may age during long-term use. The aged thick film heating element 25 has uneven impedance and increased hot spot temperature difference, which may reduce the temperature control effect on the lower mold 1, middle mold 2 and upper mold 3. The staff can use the FFT algorithm to detect the thick film heating element 25 and find the early aged thick film heating element 25. This is existing technology and will not be elaborated here.

[0048] If the operator discovers an aging thick-film heating element 25, they rotate the corresponding L-shaped rotating rod 31. Rotating the L-shaped rotating rod 31 backward causes it to rotate backward around the pivot on the support base 32, simultaneously causing one end of the L-shaped rotating rod 31 to rotate to the left. This leftward rotation of the L-shaped rotating rod 31 drives the transmission rod 30 to rotate to the left. The leftward rotation of the transmission rod 30 then drives the two transmission rods 29 to rotate to the left on the movable support block 27. The leftward rotation of the transmission rods 29 causes the transmission rod 28 to move outward, which in turn moves the support plate 23 outward. After the support plate 23 moves outward... The staff removed the damaged thick film heating element 25 and placed the new thick film heating element 25 in the appropriate position. The staff then rotated the L-shaped rotating rod 31 to reset it. At this time, the transmission rod 1 28 and the transmission rod 29 were perpendicular and self-locked. This allowed the support plate 23 to provide sufficient pressure to the multiple thick film heating elements 25, so that the thick film heating elements 25 could make close contact with the sides of the lower mold 1, the middle mold 2, and the upper mold 3. Compared with welding the thick film heating elements 25 to the sides of the lower mold 1, the middle mold 2, and the upper mold 3, the replacement is convenient, quick, and efficient, and avoids inaccurate temperature control or even temperature differences in the lower mold 1, the middle mold 2, and the upper mold 3 due to the damaged thick film heating element 25.

[0049] During this process, multiple temperature sensors 26 measure the temperature of the lower mold 1, middle mold 2, and upper mold 3. The heating of the thick film heating element 25 brings the temperatures of the lower mold 1, middle mold 2, and upper mold 3 closer together, reducing the temperature difference. The reduced temperature difference makes the temperature of each section of the outer shell and inner frame of the active hydraulic suspension bushing approximately the same, resulting in similar expansion. In addition, the thick film heating element 25 is detected by the FFT algorithm to identify aged thick film heating elements 25 in time. Through the cooperation of the L-shaped rotating rod 31, transmission rod three 30, transmission rod one 28, support pressure plate 23, and support pressure plate 23, the aged thick film heating element 25 is replaced in time, preventing large temperature differences on the lower mold 1, middle mold 2, and upper mold 3 due to the aging of the thick film heating element 25. This achieves temperature control of the lower mold 1, middle mold 2, and upper mold 3, which is helpful for the production of automotive active hydraulic suspension bushings using the lower mold 1, middle mold 2, and upper mold 3.

[0050] The auxiliary pressing component includes a positioning bracket 35. There are twelve positioning brackets 35 in total, with two positioning brackets 35 forming a group. They are fixedly installed on the front and rear sides of the lower mold 1, the middle mold 2, and the upper mold 3, respectively. A sliding column 37 is connected through the front side of the positioning bracket 35. A pressure block 36 is fixedly installed at the rear end of the sliding column 37. A second spring 38 is movably sleeved on the outer circular wall of the sliding column 37. One end of the second spring 38 is fixedly connected to one side of the inside of the positioning bracket 35, and the other end of the second spring 38 is fixedly connected to one side of the pressure block 36.

[0051] Specifically, when the support plate 23 abuts against the side of the lower mold 1, the middle mold 2, or the upper mold 3, the pressure in the middle position is stronger, while the pressure on the sides is relatively weaker. At this time, the force of the spring 2 38 causes the sliding column 37 and the pressure block 36 to press on the sides of the support plate 23, increasing the pressure on the sides of the support plate 23 and preventing the thick film heating plate 25 on both sides from not fitting tightly with the mold.

[0052] A limiting bracket 33 is fixedly installed on the right side of the support frame 24. Two sliding grooves 39 are opened on the top surface of the limiting bracket 33. The sliding grooves 39 are elastically connected to the limiting block 34 through springs 40. One side of the limiting block 34 is inclined. Two springs 40 are fixedly installed on the bottom surface of the sliding grooves 39. The upper end of the springs 40 is fixedly connected to the bottom surface of the limiting block 34.

[0053] When the support plate 23 abuts against the side of the mold, the middle area has the greatest pressure due to the lever effect. Insufficient pressure on both sides may cause the edge of the thick film heating sheet 25 to lift up. The pressure block 36 fills the pressure gap under the action of the second spring 38 to ensure that the thick film heating sheet 25 is in place.

[0054] Specifically, by using the L-shaped rotating rod 31, before the worker rotates the L-shaped rotating rod 31 to disengage the support plate 23 from the side of the mold, the worker presses down the limiting block 34. This causes the limiting block 34 to move downward inside the sliding groove 39 on the limiting bracket 33, while the spring 340 is compressed. Only after the limiting block 34 is no longer restricted can the worker rotate the L-shaped rotating rod 31.

[0055] On the other hand, when the worker rotates the L-shaped rotating rod 31 to reset, the L-shaped rotating rod 31 presses against the inclined surface of the limiting block 34, causing the limiting block 34 to move downward inside the sliding groove 39, while simultaneously compressing the two springs 40. When one side of the L-shaped rotating rod 31 rotates to abut against the side of the limiting block 34 on the other side, the force of the springs 40 causes the limiting block 34 to move upward. At this time, the two limiting blocks 34 can engage the L-shaped rotating rod 31, preventing the L-shaped rotating rod 31 from rotating arbitrarily and avoiding loosening of the support plate 23.

[0056] The bottom surface of the lower mold 1 is provided with a spiral groove 44, and a magnetizing coil 45 is fixedly sleeved inside the spiral groove 44. When the operator connects the power supply to the magnetizing coil 45, a uniform magnetic field is generated inside the magnetizing coil 45 according to Ampere's circuital law. The direction of the magnetic field is perpendicular to the top surface of the lower mold 1, which forms an adsorption force on the outer shell and the inner frame, eliminating the risk of component displacement.

[0057] Specifically, by energizing the magnetizing coil 45, the operator energizes the magnetizing coil 45, which makes the lower mold 1 magnetic. After the operator places the outer shell and inner skeleton inside the molding cavity 4 of the lower mold 1, the magnetism on the lower mold 1 can attract the outer shell and inner skeleton, preventing them from shifting during the subsequent injection molding process.

[0058] As a preferred embodiment of this example, please refer to [link / reference]. Figures 1-10The connecting mechanism 7 includes several positioning bases 13, all of which are fixedly installed on the top surface of the lower mold 1. A connecting groove 16 is formed on the top surface of each positioning base 13. A support ring 18 is fixedly installed inside the connecting groove 16. A connecting column 20 is slidably connected to the inner circular wall of the support ring 18. A movable stop 46 is fixedly installed on the bottom surface of the connecting column 20. A connecting chamber 17 is fixedly installed on the top surface of the connecting column 20. The inner circular wall of the connecting chamber 17 is wavy and concave inwards. Spring 21 is movably sleeved on the outer circular wall of 20. The upper end of spring 21 is fixedly connected to the bottom surface of support ring 18, and the lower end of spring 21 is fixedly connected to the top surface of movable stop block 46. Pressure sensor 19 is fixedly installed on the inner bottom surface of connecting groove 16. Several connecting bases 12 are fixedly installed on the bottom surface of upper mold 3. Connecting block 22 is fixedly installed on the bottom surface of connecting base 12. The outer wall of connecting block 22 is wavy and protrudes outward. Connecting block 22 is movably engaged with connecting groove 16.

[0059] During the mold closing process, the connecting block 22 enters the connecting groove 16, and the wavy protrusion initially engages with the wavy recess on the inner wall of the connecting chamber 17. The connecting block 22 pushes the connecting chamber 17 downward, causing the connecting column 20 to slide within the support ring 18, thus achieving vertical anti-disengagement and horizontal anti-deviation. When the connecting column 20 moves downward, the spring 21 is stretched, and the movable stop 46 descends with the connecting column 20, squeezing the pressure sensor 19 and outputting a voltage signal to determine whether the mold is accurately closed.

[0060] There are notches at all four corners of the middle mold 2. The connecting base 12 and the positioning base 13 can be matched with the notches at the corners of the middle mold 2 to position the middle mold 2.

[0061] Specifically, when the upper mold 3 is closed on the lower mold 1 and the middle mold 2, the connecting block 22 on the bottom surface of the upper mold 3 connects to the base 12 and enters the interior of the connecting chamber 17 on the positioning base 13. This causes the connecting chamber 17 to move the connecting column 20 downward on the support ring 18, while the spring 21 is stretched. The downward movement of the connecting column 20 also causes the movable stop 46 to move downward. The downward movement of the movable stop 46 will squeeze the pressure sensor 19 inside the connecting groove 16 on the positioning base 13. If the pressure sensor 19 senses pressure, it means that the lower mold 1, the middle mold 2 and the upper mold 3 have been successfully closed. Otherwise, it means that the gap after the lower mold 1, the middle mold 2 and the upper mold 3 are closed is large, achieving the connection effect between the lower mold 1 and the upper mold 3.

[0062] The top surface of the support frame 24 is provided with a limiting groove 41. A limiting rod 42 is fixedly installed inside the limiting groove 41. A sliding support block 43 is slidably connected to the outer circular wall of the limiting rod 42. The sliding support block 43 has an L-shaped structure. The front side of the sliding support block 43 is fixedly connected to the rear side of the support pressure plate 23.

[0063] Specifically, by setting the support plate 23, the movement of the support plate 23 will drive the sliding support block 43 to move along the limiting rod 42 inside the limiting groove 41 on the support frame 24. The limiting groove 41, the limiting rod 42 and the sliding support block 43 work together to limit the movement of the support plate 23, thereby achieving the effect of limiting the support plate 23 and improving the stability of the movement of the support plate 23.

[0064] Several mounting brackets 14 are fixedly installed on the bottom surface of the lower mold 1, and two fixing holes 15 are opened on the inner bottom surface of the mounting brackets 14.

[0065] Specifically, by using the mounting bracket 14, the operator inserts bolts into the fixing holes 15 on the mounting bracket 14, thereby fixing the lower mold 1 onto the workbench.

[0066] Working principle: In use, the lower mold 1 is fixed on the workbench by inserting bolts into the fixing holes 15 on the mounting bracket 14. The operator places the outer shell and inner skeleton of the active hydraulic suspension bushing inside the forming cavity 4 of the lower mold 1. The operator energizes the magnetizing coil 45. According to Ampere's circuital law, a uniform magnetic field is generated inside the magnetizing coil 45. The direction of the magnetic field is perpendicular to the top surface of the lower mold 1, which forms an adsorption force on the outer shell and inner skeleton to prevent the parts from shifting.

[0067] External hydraulic equipment drives the middle mold 2 and lower mold 1 to close. The upper mold 3 also closes with the lower mold 1 and middle mold 2 under the action of the external hydraulic equipment. During the mold closing process, the connecting block 22 on the bottom surface of the upper mold 3 connects to the base 12 and enters the interior of the connecting chamber 17 on the positioning base 13. The wavy protrusion of the connecting block 22 initially engages with the wavy indentation on the inner wall of the connecting chamber 17. The connecting block 22 pushes the connecting chamber 17 downwards, causing the connecting column 20 to slide within the support ring 18, achieving vertical anti-disengagement and horizontal anti-deviation. When the connecting column 20 moves downwards, the spring 21 is stretched, and the movable stop 46 descends with the connecting column 20 to contact the pressure sensor 19. The pressure sensor 19 senses the pressure and outputs a voltage signal to determine whether the mold closing is accurate.

[0068] The externally mixed rubber is injected through multiple injection holes 11, and the rubber is vulcanized between the outer shell and the inner skeleton to achieve the molding of the automotive active hydraulic suspension bushing.

[0069] After the first batch of active hydraulic suspension bushings is formed, the temperatures on the lower mold 1, middle mold 2, and upper mold 3 are different. Multiple temperature sensors 26 on the lower mold 1, middle mold 2, and upper mold 3 measure the temperature of their respective molds. The average temperature of the three molds is compared, and the highest average temperature is set as a threshold. If the temperature on the other two molds is lower than this threshold, multiple thick-film heating elements 25 on the corresponding two molds are activated. The thick-film heating elements 25 are controlled by an external PID controller to heat the molds until the average temperature on the two molds is close to the threshold, thus reducing the temperature difference on the three molds. Insulation sleeve 1 8, insulation sleeve 2 9, and insulation sleeve 3 10 can reduce the temperature loss of the three molds.

[0070] Thick-film heating element 25 may age during long-term use. Workers use an FFT algorithm to inspect the thick-film heating element 25 and identify early signs of aging. If an aged thick-film heating element 25 is found, the worker presses down on the limiting block 34. The limiting block 34 moves downward within the sliding groove 39 on the limiting bracket 33, compressing the spring 30. After the limiting block 34 is released, the worker rotates the L-shaped rotating rod 31 backward. The L-shaped rotating rod 31 rotates backward around the pivot on the support base 32, while one end rotates to the left, causing the transmission rod 30 to rotate to the left. The transmission rod 30 then causes the two transmission rods 29 to rotate to the left on the movable support block 27. The transmission rods 29 cause the transmission rod 1 28 to move outward, which in turn causes the support plate 23 to move outward. After the support plate 23 moves outward, the worker removes the damaged thick-film heating element 25 and places a new one in the appropriate position. Then, the L-shaped rotating rod 31 is rotated back to its original position. At this time, transmission rod 28 and transmission rod 29 are perpendicular to each other and achieve self-locking. The support plate 23 provides sufficient pressure to the multiple thick film heating elements 25, so that the thick film heating elements 25 are in close contact with the side of the mold.

[0071] When the operator rotates the L-shaped rotating rod 31 to its original position, the L-shaped rotating rod 31 presses against the inclined surface of the limiting block 34, causing the limiting block 34 to move downward inside the sliding groove 39, compressing the two springs 40. When one side of the L-shaped rotating rod 31 rotates to abut against the side of the limiting block 34 on the other side, the force of the springs 40 causes the limiting block 34 to move upward, and the two limiting blocks 34 engage the L-shaped rotating rod 31 to prevent it from rotating freely and to avoid loosening of the support plate 23.

[0072] Finally, when the support plate 23 abuts against the side of the mold, the pressure is stronger in the middle and relatively weaker on both sides. The force of the spring 2 38 causes the sliding column 37 and the pressure block 36 to press against both sides of the support plate 23, increasing the pressure on both sides of the support plate 23 and preventing the thick film heating plates 25 on both sides from not fitting tightly with the mold.

[0073] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automobile active hydraulic suspension bushing forming die characterized by, Include: Lower mold, the top surface of the lower mold is provided with a middle mold, the top surface of the middle mold is provided with an upper mold, the top surface of the lower mold and the bottom surface of the upper mold are provided with a plurality of forming cavities, the top surface of the middle mold is provided with a plurality of positioning cavities, the top surface of the upper mold is provided with a plurality of injection holes, every three injection holes are in a triangular shape and are communicated with the forming cavities on the bottom surface of the upper mold; Temperature control mechanism, the temperature control mechanism is arranged on the outside of the lower mold, which is used for reducing the temperature of the lower mold, the middle mold and the upper mold; The temperature control mechanism includes a heat preservation sleeve one, the heat preservation sleeve one is fixedly sleeved on the outside of the lower mold, the outside of the middle mold is fixedly sleeved with a heat preservation sleeve two, the outside of the upper mold is fixedly sleeved with a heat preservation sleeve three, the heat preservation sleeve one, the heat preservation sleeve two and the heat preservation sleeve three are used for reducing heat loss, the front and back sides of the heat preservation sleeve one, the heat preservation sleeve two and the heat preservation sleeve three are embedded with a plurality of thick film heating pieces, the top surface of the lower mold, the top surface of the middle mold and the bottom surface of the upper mold are embedded with a plurality of temperature sensors, the temperature of the lower mold, the middle mold and the upper mold is detected by a plurality of temperature sensors, the temperature of the lower mold, the middle mold and the upper mold is close to the temperature of the lower mold, the middle mold and the upper mold by the heating of a plurality of thick film heating pieces, the temperature control mechanism further includes a quick replacement part and an auxiliary pressing part; Connecting mechanism, the connecting mechanism is arranged on the top surface of the lower mold, which is used for connecting the lower mold and the upper mold; The quick replacement part includes a support pressing plate, the support pressing plate is provided with six, every two support pressing plates are arranged on the front and back sides of the lower mold, the middle mold and the upper mold, the two sides of the lower mold, the middle mold and the upper mold are fixedly installed with a support frame, one side of the support pressing plate is fixedly installed with a transmission rod one, the inside of the support pressing plate is fixedly installed with two movable support blocks, the two movable support blocks are rotatably connected with a transmission rod two on the two sides close to each other, the front end of the transmission rod two is rotatably connected with the rear end of the transmission rod one, the inside top surface of the support pressing plate is fixedly installed with a support base, the top surface of the support base is rotatably connected with an L-shaped rotating rod, the top surface and the bottom surface of the L-shaped rotating rod are rotatably connected with a transmission rod three, the left end of the transmission rod three is coaxially connected with the front end of the transmission rod two, the right side of the support frame is fixedly installed with a limiting support, the top surface of the limiting support is provided with two sliding grooves, the inside of the sliding groove is elastically connected with a limiting block through a spring three, one side of the limiting block is inclined, the top surface of the support frame is provided with a limiting sliding groove, the inside of the limiting sliding groove is fixedly installed with a limiting rod, the outer circular wall surface of the limiting rod is slidably connected with a sliding support block, the front side of the sliding support block is fixedly connected with the rear side of the support pressing plate.

2. The forming die for an active hydraulic suspension bushing of an automobile according to claim 1, characterized in that: The auxiliary lower pressing piece comprises positioning supports, twelve of which are provided in total, two of which form a group and are fixedly installed on the front and back sides of the lower mold, the middle mold and the upper mold respectively, a sliding column is connected through the front side of the positioning support, a pressing block is fixedly installed on the rear end of the sliding column, and spring two is movably sleeved on the outer circular wall surface of the sliding column.

3. The forming die for an active hydraulic suspension bushing of an automobile according to claim 1, characterized in that: The bottom surface of the lower mold is provided with a spiral groove, and the inside of the spiral groove is fixedly sleeved with a magnetizing coil.

4. The forming die for an active hydraulic suspension bushing of an automobile according to claim 1, characterized by: The connecting mechanism comprises a plurality of positioning bases, the plurality of positioning bases are fixedly installed on the top surface of the lower mold, the top surface of the positioning base is provided with a connecting groove, the inside of the connecting groove is fixedly installed with a supporting ring, the inner circular wall surface of the supporting ring is slidingly connected with a connecting column, the bottom surface of the connecting column is fixedly installed with a movable stop block, the top surface of the connecting column is fixedly installed with a connecting bin, the outer circular wall surface of the connecting column is movably sleeved with spring one, the inside bottom surface of the connecting groove is fixedly installed with a pressure sensor, the bottom surface of the upper mold is fixedly installed with a plurality of connecting bases, the bottom surface of the connecting base is fixedly installed with a connecting clamping block, and the connecting clamping block is movably connected with the connecting groove.

5. The forming die for an active hydraulic suspension bushing of an automobile according to claim 1, characterized by: The bottom surface of the lower mold is fixedly installed with a plurality of installation supports, and two fixed holes are formed in the inside bottom surface of the installation support.

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