Die assembly structure for rubber coating of shock absorber piston

Abstract

The utility model discloses a mold assembly structure for rubber coating of a shock absorber piston, which comprises a hot mold, a ceramic electric heating ring is wrapped outside the hot mold, a piston sleeve is fixedly mounted at the top of the hot mold, a hot pressing head is mounted above the piston sleeve, and a cold mold body is mounted at the bottom of the hot mold. A general split water jacket wraps the outer side of the cold mold body, a cold mold cooling water inlet is formed in the right side of the bottom of the general split water jacket, and a cold mold cooling water outlet is formed in the left side of the upper part of the general split water jacket; and the universal split water jacket comprises a cold mold matching cavity which is wrapped and fixed on the outer side surface of the cold mold body. According to the mold assembly structure for rubber coating of the shock absorber piston, the function of the rubber coating process is better achieved, and the effect is remarkable; compared with an existing mold assembly structure, the mold and the assembly structure are simplified, so that mold assembly and maintenance operation becomes simple and rapid, and the mold conforms to the development trend of multiple varieties, small batches and rapid mold replacement.

Description

Technical Field

[0001] This utility model relates to the field of shock absorbers, specifically a mold assembly structure for rubber coating of shock absorber pistons. Background Technology

[0002] With the progress of China's automotive industry, except for most commercial vehicles which still use wide-groove pistons with metal piston rings, the passenger car shock absorber market has basically adopted the fine-groove piston rubber coating process. The advantages of this process are that the rubber-coated piston has low operating noise, good sealing effect, low manufacturing cost, and is easy to use, so it has been widely welcomed by automotive OEMs. At the same time, in order to meet the increasingly diversified needs of customers, the competition in the automotive industry is becoming increasingly fierce, and the upgrading and replacement of automotive products is becoming faster and faster.

[0003] Furthermore, dual-piston technology has been gradually introduced into China and currently accounts for about one-third of the piston product market. Due to its structural characteristics, the height of dual-piston pistons is 1.5 to 2 times that of the original single-piston pistons. The current overmolding process mostly uses a press head to press each piston individually and then extrudes them one by one in a stacked manner. In order to ensure sufficient heating and plasticizing time, the overmolding cycle of dual-piston pistons has to be extended by about 50%. The fragmentation of the above-mentioned equipment and the trend of dual-piston development have put forward more urgent requirements for cost reduction and efficiency improvement in the overmolding process. Therefore, there is an urgent need for a mold assembly structure for overmolding shock absorber pistons to solve the above-mentioned defects. Utility Model Content

[0004] The purpose of this invention is to provide a mold assembly structure for rubber coating of shock absorber pistons, so as to solve the defects mentioned in the background art.

[0005] To achieve the above objectives, a mold assembly structure for rubber coating of a shock absorber piston is provided, comprising a hot mold, a ceramic electric heating ring wrapped around the outside of the hot mold, a piston sleeve fixedly installed on the top of the hot mold, a hot pressure head installed above the piston sleeve, a cold mold body installed at the bottom of the hot mold, a universal split water jacket wrapped around the outside of the cold mold body, a cold mold cooling water inlet on the bottom right side of the universal split water jacket, and a cold mold cooling water outlet on the upper left side of the universal split water jacket; the universal split water jacket includes a cold mold assembly cavity wrapped and fixed on the outer surface of the cold mold body, and a cooling water inlet and outlet are provided on the cold mold assembly cavity; a piston entry guide section is provided on the top of the hot mold, and a thermocouple screw hole is provided on the end face of the hot mold.

[0006] Preferably, the central axes of the hot mold and the ceramic electric heating coil are aligned, and the bottom of the hot mold is screwed to the upper circumferential inner wall of the universal split water jacket.

[0007] Preferably, the bottom of the hot mold is fixedly provided with a base, and the size of the base is compatible with the thread of the hot mold assembly. At the same time, the base is screwed onto the thread of the hot mold assembly.

[0008] Preferably, the axial cross-section of the cold mold body and the universal split water jacket is a concentric circle structure, and a groove is provided on the outer side of the cold mold body. At the same time, a cold mold cooling water chamber is formed between the cold mold body and the universal split water jacket. The cold mold cooling water chamber is connected to the cold mold cooling inlet and the cold mold cooling outlet respectively.

[0009] Preferably, the bottom of the universal split water jacket is evenly provided with multiple sets of mold release damping seat connecting screw holes, and the universal split water jacket and the cold mold body are fixedly connected by the mold release damping seat connecting screw holes and bolts.

[0010] Preferably, the upper and lower ends of the cold mold body are fixedly provided with connecting seats, and two sets of O-ring sealing grooves are opened on the outer side of the two sets of connecting seats. At the same time, the cold mold body is densely connected inside the universal split water jacket through four sets of O-ring sealing grooves and four sets of O-rings. A tapered transition section is opened inside the connecting seat at the upper end of the cold mold body.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model achieves better performance in the overmolding process by separating the universal split water jacket from the mold structure, optimizing the shape and size of the mold structure, and simplifying the electric heating components. Compared with the previous existing mold assembly structure, the simplification of the mold and assembly structure makes mold assembly and maintenance simple and quick, which is in line with the development trend of multi-variety, small-batch and rapid mold change.

[0013] 2. In this utility model, the hot mold, the universal split water jacket, and the cold mold body adopt a split mold design, which effectively expands the functional space of thermoplasticization, significantly improves the blockage link that affects the improvement of overmolding efficiency, and increases actual production capacity by about 50%. The use of the universal split water jacket structure greatly reduces the mold preparation cost. At the same time, the increase in the outer size of the mold and the water jacket eliminates the limitation of the original structure on the piston specification series, and also leaves room for the repeated reuse of scrapped molds. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of a general-purpose split water jacket structure;

[0016] Figure 3 This is a schematic diagram of the thermal model structure;

[0017] Figure 4 This is a schematic diagram of the cold mold body structure;

[0018] Figure 5 This is a 3D view of the cold mold body;

[0019] Figure 6 This is a schematic diagram of the mold assembly structure in the prior art.

[0020] The following are the labels in the diagram: 1. Hot press head; 2. Hot mold; 21. Piston entry guide section; 22. Thermocouple screw hole; 23. Base; 3. Ceramic electric heating coil; 4. Universal split water jacket; 41. Hot mold assembly with thread; 42. Cold mold assembly with cavity; 43. Cooling water inlet and outlet; 44. Mold release damping seat connecting screw hole; 5. Cold mold cooling water chamber; 6. Cold mold body; 61. Conical transition section; 62. O-ring seal groove; 7. Cold mold cooling water inlet; 8. Cold mold cooling water outlet; 9. Piston sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-6 This utility model provides a mold assembly structure for rubber coating of shock absorber pistons, including a hot mold 2, a ceramic electric heating ring 3 wrapped around the outside of the hot mold 2, a piston sleeve 9 fixedly installed on the top of the hot mold 2, a hot pressure head 1 installed above the piston sleeve 9, a cold mold body 6 installed at the bottom of the hot mold 2, a universal split water jacket 4 wrapped around the outside of the cold mold body 6, a cold mold cooling water inlet 7 opened on the bottom right side of the universal split water jacket 4, and a cold mold cooling water outlet 8 opened on the upper left side of the universal split water jacket 4; the universal split water jacket 4 includes a cold mold assembly cavity 42 wrapped and fixed on the outer surface of the cold mold body 6, and a cooling water inlet and outlet 43 is provided on the cold mold assembly cavity 42; a piston entry guide section 21 is provided on the top of the hot mold 2, and a thermocouple screw hole 22 is provided on the end face of the hot mold 2.

[0023] Working principle: By separating the universal split water jacket 4 from the mold structure, optimizing the shape and size of the mold structure, and simplifying the electric heating components, the function of the overmolding process is better achieved, with significant results; Compared with the previous existing mold assembly structure: the simplification of the mold and assembly structure makes mold assembly and maintenance operations simple and quick, which is in line with the development trend of multi-variety, small-batch and rapid mold change.

[0024] In this utility model, the hot mold 2, the universal split water jacket 4, and the cold mold body 6 adopt a split mold design, which effectively expands the thermoplasticization functional space, significantly improves the blockage link that affects the improvement of the overmolding efficiency, and increases the actual production capacity by about 50%.

[0025] This utility model adopts the structure of a universal split water jacket 4, which greatly reduces the mold manufacturing cost. At the same time, the increased size of the mold and water jacket breaks away from the original structure's limitation on piston specifications and leaves room for the repeated reuse of scrapped molds.

[0026] The traditional hot mold cooling section is removed, and the mold wall thickness is significantly increased to improve the efficiency of the thermoplasticization section.

[0027] Comparison Reference Figure 1 and Figure 6 The structure of stacking cold and hot molds and fastening them to the mold frame with bolts has been changed to a universal water jacket fixed on the mold frame as a common installation platform for cold and hot molds. When installing the mold, you only need to manually press in the cold mold body 6 and then screw the hot mold 2 into place. There is no need for centering operation or disassembling and assembling the circulating cooling water connector, which is convenient and quick.

[0028] The complex structure of the electric heating rod and copper heat transfer body is changed to a structure in which the ceramic electric heating ring 3 is directly attached to the outer cylindrical surface of the hot mold 2. This structure is convenient, readily available, and inexpensive. It provides more uniform heating, more accurate and precise temperature measurement and control, and can effectively avoid the phenomenon of uneven temperature on the outer cylindrical surface of the hot mold 2 caused by partial breakage of the heating rod.

[0029] By changing the shape and size of the plasticizing hot mold 2, the effective length of the plasticizing section is significantly increased. At the same time, the thickened mold body also increases the heat capacity of the mold body, which helps to reduce the temperature fluctuation of the hot mold 2, thereby providing conditions for shortening the hot pressing cycle. In addition, the flexible sealing assembly mechanism of the cooling mold and the universal split water jacket 4 disclosed in this utility model significantly increases the heat exchange surface area of ​​the cooling water chamber 5 of the cold mold, which can ensure that the product can still be fully cooled even after removing the original cooling structure of the lower section of the hot mold 2.

[0030] The advantages of this invention also include: compared with the existing structure, each rubber coating equipment of this invention only needs to be equipped with one universal water jacket, which greatly reduces the processing complexity and manufacturing cost of the mold; in addition, this invention also expands the range of adaptable specifications of rubber-coated pistons, and the outer diameter of rubber-coated pistons has been increased from ≤32mm to ≤50mm, which covers all the specifications currently suitable for passenger cars.

[0031] This utility model also has an obvious advantage: the assembly and maintenance of the mold and the assembly of the electric heating system become very simple, and the cooling water connector is normally fixed on the water jacket, so there is no need to repeatedly disassemble and assemble when changing the mold.

[0032] Unlike the original mold assembly structure and connection method, the original mold's universal split water jacket 4 is always fixed in the hot press mold frame of the rubber coating equipment. It is fixed to the template by a flange ring or pressure plate. Its position is only adjusted when the mold opening and hot press head 1 are aligned during the first mold assembly. After alignment, it can be locked. No disassembly or adjustment is required when changing the mold. The water cooling system's inlet and outlet water connectors are connected to the corresponding screw holes. Water pipes can be inserted. No disassembly is required when changing the mold. Just like the original structure, before disassembling the mold, the machine's cooling water valve needs to be closed and the residual water in the cold mold cooling water chamber 5 needs to be blown out with compressed air.

[0033] The cooling mold must overcome the squeezing force between its O-ring and the inner wall of the water jacket and be pushed upwards from the bottom of the universal split water jacket 4. This may require the cooperation of multiple pads. Before the cold mold is installed into the universal split water jacket 4, the O-ring must be checked to ensure it is intact. Then, a small amount of grease is applied to the surface of the O-ring. The mold is then aligned with the inner cavity of the water jacket and pressed in manually or with the help of the hot press head 1 until it reaches the lower limit step of the water jacket. Unlike the original structure, the split structure allows the scale in the cooling water chamber 5 of the cold mold to be easily cleaned after disassembly.

[0034] The plasticizing hot mold 2 is very easy to disassemble and assemble. Simply rotate the mold body and the lower external thread can be connected or separated from the hot mold assembly thread 41 on the universal split water jacket 4. It can be tightened manually. Disassembly can also be carried out using the screw holes on the upper part of the mold body.

[0035] After the hot and cold molds are assembled, no centering or adjustment is required, nor are any additional fasteners needed. Then, the electric ceramic heating ring is fitted onto the outer cylindrical surface of the hot mold 2 and locked in place. The heat sensor is then inserted into the screw hole of the hot mold. After opening the cooling water valve, the power can be turned on for heating. Once the temperature is reached, production can begin.

[0036] The central axes of the hot mold 2 and the ceramic electric heating ring 3 are aligned, and the bottom of the hot mold 2 is screwed to the upper circumferential inner wall of the universal split water jacket 4.

[0037] In a preferred embodiment, a base 23 is fixedly provided at the bottom of the hot mold 2, and the size of the base 23 is compatible with the size of the hot mold assembly thread 41. At the same time, the base 23 is screwed onto the hot mold assembly thread 41.

[0038] The axial cross-section of the cold mold body 6 and the universal split water jacket 4 is a concentric circle structure, and a groove is provided on the outer side of the cold mold body 6. At the same time, a cold mold cooling water chamber 5 is formed between the cold mold body 6 and the universal split water jacket 4. The cold mold cooling water chamber 5 is connected to the cold mold cooling water inlet 7 and the cold mold cooling water outlet 8 respectively.

[0039] As a preferred embodiment, the bottom of the universal split water jacket 4 is evenly provided with multiple sets of demolding damping seat connecting screw holes 44, and the universal split water jacket 4 and the cold mold body 6 are fixedly connected by the demolding damping seat connecting screw holes 44 and bolts.

[0040] The upper and lower ends of the cold mold body 6 are fixedly provided with connecting seats, and two sets of O-ring sealing grooves 62 are opened on the outer side of the two sets of connecting seats. At the same time, the cold mold body 6 is densely connected inside the universal split water jacket 4 through four sets of O-ring sealing grooves 62 and four sets of O-rings. The connecting seat at the upper end of the cold mold body 6 is provided with a tapered transition section 61.

[0041] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mould set-up for the encapsulation of a shock absorber piston comprising a hot mould (2), characterised in that: The outer side of the hot die (2) is wrapped with a ceramic electric heating ring (3), and the top of the hot die (2) is fixedly provided with a piston sleeve (9), and the upper side of the piston sleeve (9) is provided with a hot pressing head (1), and the bottom of the hot die (2) is provided with a cold die body (6), and the outer side of the cold die body (6) is wrapped with a general split water jacket (4), and the bottom right side of the general split water jacket (4) is provided with a cold die cooling water inlet (7), and the upper left side of the general split water jacket (4) is provided with a cold die cooling water outlet (8); the general split water jacket (4) comprises a cold die assembly cavity (42) wrapped and fixed on the outer side surface of the cold die body (6), and the cold die assembly cavity (42) is provided with a cooling water inlet and outlet (43), and the top of the hot die (2) is provided with a piston die guide section (21), and the end face of the hot die (2) is provided with a thermocouple screw hole (22).

2. A mold set configuration for encapsulating a shock absorber piston according to claim 1, characterized in that: The central axes of the hot die (2) and the ceramic electric heating ring (3) are coincidentally arranged, and the bottom of the hot die (2) is screw-fixed with the upper circumferential inner wall of the general split water jacket (4).

3. A mold set configuration for encapsulating a shock absorber piston according to claim 2, characterized in that: The bottom of the hot die (2) is fixedly provided with a base (23), and the size of the base (23) is matched with the hot die assembly thread (41), and the base (23) is screw-fixed on the hot die assembly thread (41).

4. A mold set configuration for encapsulating a shock absorber piston according to claim 1, wherein: The axial section of the cold die body (6) and the general split water jacket (4) is a concentric circle structure, and the outer side of the cold die body (6) is provided with a groove, and the cold die body (6) and the general split water jacket (4) form a cold die cooling water chamber (5), and the cold die cooling water chamber (5) is respectively communicated with the cold die cooling water inlet (7) and the cold die cooling water outlet (8).

5. A mold set configuration for encapsulating a shock absorber piston according to claim 1, wherein: The bottom of the general split water jacket (4) is uniformly provided with a plurality of die ejection damping seat connecting screw holes (44), and the general split water jacket (4) and the cold die body (6) are fixedly connected through the die ejection damping seat connecting screw holes (44) and bolts.

6. A mold set configuration for encapsulating a shock absorber piston according to claim 1, wherein: The upper end and the lower end of the cold die body (6) are fixedly provided with connecting seats, and the outer sides of the two connecting seats are provided with two groups of O-shaped sealing ring grooves (62), and the cold die body (6) is internally and densely connected through four groups of O-shaped sealing ring grooves (62) and four groups of O-shaped sealing rings in the general split water jacket (4), and the connecting seat of the upper end of the cold die body (6) is internally provided with a tapered transition section (61).

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