A vertical step-forming polyurethane support mold structure

Abstract

The utility model discloses a vertical step -by -step forming's polyurethane support die structure, including left end mould, middle die subassembly and right end mould, middle die subassembly includes first middle die and second middle die who set up oppositely up and down, and the end part of first middle die and second middle die is fixedly connected through two groups of symmetrical fastening bolt and fastening nut, and the both sides of first middle die and second middle die are evenly provided with a plurality of fixed threads along the circumference respectively, and left end mould and right end mould are fixedly connected with the both sides of first middle die and second middle die through the fixed bolt of adapting with fixed thread respectively, the inboard of left end mould is fixedly provided with support lower sealing plate through the positioning bolt, and the inboard of right end mould is fixedly provided with support upper sealing plate through the positioning bolt. The utility model discloses through the unique vertical casting design to replace the traditional horizontal casting, significantly reduces product internal bubble and surface material defect such as lack, and has promoted product compactness and appearance quality.

Description

Technical Field

[0001] This utility model relates to the field of polyurethane product molding die technology, and in particular to a vertical step-forming polyurethane support die structure. Background Technology

[0002] Polyurethane bearings are typically formed by casting polyurethane compound with internally embedded sealing plates and reinforcing steel plates. The molding quality directly determines the product's mechanical properties and service life. Currently, these products generally use casting molding, and the molds used are mostly horizontal three-part molds, typically consisting of an upper mold, a middle mold, and a lower mold. During production, the metal insert is first suspended and positioned in the mold cavity using manually cut polyurethane layered pads, and then the mold is closed for preheating and casting.

[0003] However, such existing horizontal molds still face significant technical bottlenecks in practical applications, mainly in the following aspects:

[0004] (1) Insufficient reliability of metal insert positioning: The poor size consistency of the polyurethane pads that rely on manual cutting not only introduces positioning errors, but also affects the interface fusion effect between the pads and the subsequent cast adhesive and metal inserts. This can easily lead to the pads and adhesive detaching, and the metal inserts shifting or tilting during mold closing or filling, ultimately causing product structure deviation or scrap.

[0005] (2) Poor venting leads to internal defects: Polyurethane adhesive is prone to accumulating air in the metal insert area during the casting process. Moreover, the adhesive will also generate gas during the reaction process in the mold. If the gas cannot be effectively discharged through the conventional venting system, it will easily accumulate at the top of the cavity or around the metal insert, forming bubbles, shrinkage cavities and surface material shortages, which seriously affect the density and appearance quality of the product.

[0006] (3) Low material utilization efficiency and poor process controllability: Due to structural limitations, existing horizontal molds can only have their injection ports located in the narrow gap between the cavity and the metal insert, and their diameter is relatively small. This design makes it easy for air pockets to form after the gating pipe goes deep, making it impossible to reliably ensure that each layer of polyurethane material is completely filled. To improve venting, the solution is usually to enlarge the injection groove and add a temporary material storage tank for the injection outlet. Although this helps to expel gas to a certain extent, it also causes a large amount of material to remain in the runner and cavity and cannot be used, significantly reducing the material utilization rate. At the same time, the casting process relies entirely on manual experience to control the amount of material added, making it difficult to guarantee accuracy and easily resulting in under-filling or over-filling. This not only exacerbates the waste of raw materials but also significantly increases the cost of mold cleaning and subsequent repairs.

[0007] (4) Low molding efficiency and poor adaptability: Existing molds can only be demolded after the product has been completely cured, resulting in a long production cycle and making it impossible to support the manufacturing of high-precision composite structure products that require step-by-step casting or intermediate shaping.

[0008] Therefore, there is an urgent need for a new type of polyurethane bearing mold that can fundamentally improve the positioning accuracy and fusion reliability of metal inserts, solve problems such as poor venting, material leakage and poor process adaptability, so as to achieve high-quality and high-efficiency polyurethane bearing production. Utility Model Content

[0009] The purpose of this utility model is to provide a vertical, step-by-step molding structure for a polyurethane support mold, thereby solving the technical problems mentioned in the background art.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] This utility model discloses a vertical, step-by-step polyurethane support mold structure, comprising a left end mold, a middle mold assembly, and a right end mold. The middle mold assembly includes a first middle mold and a second middle mold arranged vertically opposite each other. The ends of the first middle mold and the second middle mold are fixedly connected by two sets of symmetrically arranged fastening bolts and fastening nuts. Multiple fixing threads are evenly provided on both sides of the first middle mold and the second middle mold along the circumferential direction. The left end mold and the right end mold are fixedly connected to the two sides of the first middle mold and the second middle mold by fixing bolts adapted to the fixing threads. A lower support sealing plate is fixedly provided on the inner side of the left end mold by positioning bolts, and an upper support sealing plate is fixedly provided on the inner side of the right end mold by positioning bolts.

[0012] Furthermore, the end of the first intermediate mold furthest from the second intermediate mold is provided with a casting observation window that communicates with its inner cavity.

[0013] Furthermore, the second intermediate mold has an insertion slot at one end away from the first intermediate mold, and a positioning insertion plate is inserted into the insertion slot. The lower sealing plate of the support and the upper sealing plate of the support are respectively positioned and engaged with the two ends of the positioning insertion plate.

[0014] Furthermore, the positioning insert plate is fixedly provided with multiple support clamping steel plates at even intervals between the upper sealing plate and the lower sealing plate of the support, and a polyurethane adhesive layer to be poured is formed between each of the support clamping steel plates.

[0015] Furthermore, the first intermediate mold has a glue-blocking groove at one end near the second intermediate mold, and the second intermediate mold has a glue-blocking platform at one end near the first intermediate mold that is compatible with the glue-blocking groove.

[0016] Furthermore, the left end mold and the right end mold are provided with a cutting die platform at the closed contact surface with the middle mold assembly.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0018] (1) Precise positioning: By setting a positioning insert plate inside the cavity, this utility model eliminates the backward process of relying on manual cutting of shims, and realizes the precise positioning and reliable fixing of metal inserts (upper and lower sealing plates and stiffening steel plates) in the cavity, avoiding the error caused by manual shim positioning and the displacement problem caused by delamination, thus improving product consistency and pass rate.

[0019] (2) High efficiency in venting and low defect rate: This utility model replaces the traditional horizontal casting with a unique vertical casting design and micro-gap fit. After the mold is closed, the gas generated during the polyurethane casting process and the reaction of the adhesive can be smoothly discharged, which significantly reduces defects such as internal bubbles and surface material shortages in the product and improves the density and appearance quality of the product.

[0020] (3) Cost savings and improved process controllability: This utility model designs the intermediate mold assembly as a separable two-part structure, and opens a dedicated pouring observation window on the upper part of the first intermediate mold, allowing direct visual observation or monitoring of the filling status of each layer of adhesive material through equipment, thus realizing visualization of the pouring process. At the same time, a glue-blocking platform structure is set on the mating surface between the first and second intermediate molds, which can effectively prevent adhesive material from overflowing from the parting surface, fundamentally reducing material loss and subsequent cleaning workload. In addition, the mold structure supports step-by-step pouring operations, and operators can adjust the pouring volume in real time according to the observation situation, significantly reducing the adhesive volume error caused by human factors, and comprehensively improving process controllability and material utilization.

[0021] (4) Strong process adaptability and high efficiency: This utility model adopts a vertical and split structure design, which naturally supports the advanced step-by-step process of first performing partial casting and micro-shaping, and then completing the final molding. It is particularly suitable for the efficient and high-quality production of complex structure supports. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a front view schematic diagram of the overall assembly structure of this utility model;

[0024] Figure 2 This is a side view of the overall assembly structure of this utility model;

[0025] Figure 3 This is a front view schematic diagram of the middle module component of this utility model;

[0026] Figure 4 This is a side view of the middle module component of this utility model;

[0027] Figure 5 This is a side view of the mold-closed state of this utility model;

[0028] Figure 6 for Figure 5 A schematic diagram of the cross-section along the CC direction;

[0029] Explanation of reference numerals in the attached drawings: 1. Left end mold; 20. Middle mold assembly; 21. First middle mold; 22. Second middle mold; 23. Positioning insert plate; 24. Fastening nut; 25. Fastening bolt; 26. Glue blocking platform; 27. Glue blocking groove; 28. Fixing thread; 29. ​​Pouring observation window; 30. Positioning insert plate groove; 3. Right end mold; 4. Fixing bolt; 5. Positioning bolt; 6. Upper sealing plate of the support; 7. Reinforcing steel plate; 8. Polyurethane adhesive layer to be poured; 9. Lower sealing plate of the support; 11. Cutting mold platform. Detailed Implementation

[0030] like Figures 1-6 As shown, a vertical step-forming polyurethane support mold structure includes a left end mold 1, a middle mold assembly 20, and a right end mold 3.

[0031] The intermediate mold assembly 20 includes a first intermediate mold 21 and a second intermediate mold 22 arranged vertically opposite each other. The ends of the first intermediate mold 21 and the second intermediate mold 22 are fixedly connected by two sets of symmetrically arranged fastening bolts 25 and fastening nuts 24. Multiple fixing threads 28 are evenly provided circumferentially on both sides of the first intermediate mold 21 and the second intermediate mold 22. The left end mold 1 and the right end mold 3 are fixedly connected to the two sides of the first intermediate mold 21 and the second intermediate mold 22 by fixing bolts 4 that are compatible with the fixing threads 28. A lower support plate 6 is fixedly connected to the inner side of the left end mold 1 by positioning bolts 5, and an upper support plate 9 is fixedly connected to the inner side of the right end mold 3 by positioning bolts 5. The intermediate mold assembly 20 of this invention is a split structure formed by the docking of the first intermediate mold 21 and the second intermediate mold 22, which allows for better observation and control of the glue volume during distributed casting, improving the original horizontal integrated casting to a vertical step-by-step casting, making it easier for gas to dissipate.

[0032] The first intermediate mold 21 has a pouring observation window 29 connected to its inner cavity at the end away from the second intermediate mold 22. The pouring observation window 29 allows direct visual observation or monitoring of the filling status of each layer of adhesive material, thus making the pouring process visible.

[0033] The second intermediate mold 22 has an insertion slot 30 at one end away from the first intermediate mold 21. A positioning insertion plate 23 is fixedly inserted into the insertion slot 30. The lower support plate 6 and the upper support plate 9 are respectively positioned and inserted into the two ends of the positioning insertion plate 23. Multiple support clamping steel plates 7 are fixedly inserted at even intervals between the upper support plate 6 and the lower support plate 9, forming a polyurethane adhesive layer 8 to be poured between each of the support clamping steel plates 7. The positioning insertion plate 23 precisely fixes the upper support plate 6, the lower support plate 9, and the support clamping steel plates between them.

[0034] The first intermediate mold 21 has a glue-blocking groove 27 at one end near the second intermediate mold 22, and the second intermediate mold 22 has a glue-blocking platform 26 adapted to the glue-blocking groove 27 at one end near the first intermediate mold 21. When the first intermediate mold 21 is connected to the second intermediate mold, the glue-blocking platform 26 and the glue-blocking groove 27 cooperate to effectively prevent the glue from overflowing from the parting surface during the casting operation.

[0035] The left mold 1 and the right mold 3 are provided with a cutting edge 11 at the closed contact surface with the middle mold assembly 20. The cutting edge 11 can further prevent the adhesive from overflowing from the parting surface, effectively reducing material loss and subsequent cleaning workload.

[0036] The step-by-step assembly process of this utility model is not described below:

[0037] Step 1: Fix the positioning plate into the positioning plate slot of the second middle mold;

[0038] Step 2: Secure the left end mold to one side of the second middle mold using fixing bolts, and connect the right end mold to the other side of the second middle mold using fixing bolts;

[0039] Step 3: Connect the upper end plate of the support to the right end mold using positioning bolts, and connect the lower end plate of the support to the left end mold using positioning bolts;

[0040] Step 4: Insert the stiffening steel plate into the partially closed component cavity;

[0041] Step 5: Perform the first pouring with the mold partially open;

[0042] Step Six: Close the first intermediate mold with the pre-cast components and lock them in place with fasteners; finally, perform the final casting through the casting observation port located on the upper part of the first intermediate mold to complete the product molding.

[0043] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A vertical, step-by-step molding structure for a polyurethane support mold, characterized in that: The system includes a left end mold, a middle mold assembly, and a right end mold. The middle mold assembly includes a first middle mold and a second middle mold arranged vertically opposite each other. The ends of the first middle mold and the second middle mold are fixedly connected by two sets of symmetrically arranged fastening bolts and fastening nuts. Multiple fixing threads are evenly provided on both sides of the first middle mold and the second middle mold along the circumference. The left end mold and the right end mold are fixedly connected to the two sides of the first middle mold and the second middle mold by fixing bolts that are adapted to the fixing threads. A lower support plate is fixedly installed on the inner side of the left end mold by positioning bolts, and an upper support plate is fixedly installed on the inner side of the right end mold by positioning bolts.

2. The vertically stepped polyurethane support mold structure according to claim 1, characterized in that: The first intermediate mold has a casting observation window connected to its inner cavity at the end furthest from the second intermediate mold.

3. The vertically stepped polyurethane support mold structure according to claim 1, characterized in that: The second intermediate mold has an insertion slot at one end away from the first intermediate mold. A positioning insert is inserted into the insertion slot. The lower sealing plate of the support and the upper sealing plate of the support are respectively positioned and engaged with the two ends of the positioning insert.

4. The vertically stepped polyurethane support mold structure according to claim 3, characterized in that: The positioning insert is fixedly installed with multiple support clamping steel plates at even intervals between the upper sealing plate and the lower sealing plate of the support, and a polyurethane adhesive layer to be poured is formed between each of the support clamping steel plates.

5. The vertically stepped polyurethane support mold structure according to claim 1, characterized in that: The first intermediate mold has a glue-blocking groove at one end near the second intermediate mold, and the second intermediate mold has a glue-blocking platform at one end near the first intermediate mold that is compatible with the glue-blocking groove.

6. The vertically stepped polyurethane support mold structure according to claim 1, characterized in that: The left end mold and the right end mold are provided with a cutting die platform at the closed contact surface with the middle mold assembly.

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