Molding and curing mold for revolving body type thin polyurethane floater product of metal piece

Abstract

The utility model belongs to the technical field of mold forming, and particularly relates to a forming curing mold for a revolving body type thin polyurethane floater product of a metal piece, which comprises an upper mold, a middle mold, a lower mold and a plug, the upper mold is connected with the lower mold through an outer hoop, the middle mold is arranged between the upper mold and the lower mold, the plug is arranged in the upper mold, the upper mold, the plug, the middle mold and the lower mold form a cavity, and the cavity is communicated with the lower mold. A lower mold core is arranged at the top of the lower mold and located in the cavity, a through hole is formed in the bottom end face of the plug, and the cavity is communicated with the outside through the through hole; according to the utility model, the high-quality forming of the thin polyurethane floater product such as the revolving body with the metal piece can be realized, and the device has the advantages of strong innovativeness, simple structure, simplicity and convenience in operation and the like.

Description

Technical Field

[0001] This utility model belongs to the field of mold forming technology, specifically relating to a molding and curing mold for thin polyurethane float products of rotating metal parts. Background Technology

[0002] Polyurethane floats are commonly used in hydraulic oil tanks to control the opening or sealing of valves via buoyancy, playing a crucial role. The manufacturing process involves six steps: material preparation, foaming, deburring, post-treatment, oil immersion test, and inspection. The foaming process is the most critical, and the design of the curing mold directly affects the molding quality of the foamed product. For thin polyurethane floats with metal components, using a traditional square curing mold presents challenges. The small float thickness (height) makes it difficult to design a suitable mold gate, and the central metal component obstructs the flow, resulting in incomplete molding and flow marks, leading to substandard appearance and failing to meet normal production and assembly requirements. The following problems also exist in practical applications:

[0003] 1. Traditional square polyurethane product molding and curing molds require four hinge bolts and four wing nuts to work together and close and lock the upper and lower molds one by one due to their structure, which is complicated and cumbersome.

[0004] 2. The mold needs to be designed with a top cover component to eject the float product when the mold is opened after solidification. This increases the amount of work and also adds two parting surfaces to the product. There will be a certain amount of overflow at these points, which will increase the workload for the subsequent deburring process.

[0005] 3. If the middle position of the upper and lower molds of the solidification mold for square float products is a movable top cover structure, both ends of the inner hole of the metal part need to match the protruding core designed in the center of the top cover. This requires high precision in mold processing and is difficult to process.

[0006] Therefore, there is an urgent need for a molding and curing mold for thin polyurethane float products with metal parts. Utility Model Content

[0007] The technical problem solved by this utility model is as follows: In order to overcome the shortcomings in the background technology, this utility model discloses a molding and curing mold for thin polyurethane float products with metal parts. This utility model can realize high-quality molding of thin polyurethane float products with metal parts, and has many advantages such as strong innovation, simple structure and easy operation.

[0008] Technical solution of this utility model

[0009] A molding and curing mold for a thin polyurethane float product with metal parts includes an upper mold 1, a middle mold 2, a lower mold 3, and a plug 4. The upper mold 1 and the lower mold 3 are connected by an outer hoop 6. The middle mold 2 is located between the upper mold 1 and the lower mold 3. The plug 4 is located inside the upper mold 1. The upper mold 1, the plug 4, the middle mold 2, and the lower mold 3 form a cavity. A lower mold core 10 is provided on the top of the lower mold 3 and is located inside the cavity. A through hole 13 is provided on the bottom end face of the plug 4, and the cavity communicates with the outside through the through hole 13.

[0010] Furthermore, two cylindrical pins 5 are provided on the outer circular surface of the plug 4. The two cylindrical pins 5 are symmetrically distributed at 180°, and the pins 5 are interference-fitted with the mounting holes on the plug 4.

[0011] Furthermore, an inner ring groove 8 is provided on the inner circular surface of the upper mold 1, and two symmetrical U-shaped grooves 7 are provided on the inner ring groove 8. The positions of the two U-shaped grooves 7 correspond to the positions of the two cylindrical locking pins 5 on the outer circular surface of the plug 4. When the plug 4 is installed, the two cylindrical locking pins 5 of the plug 4 are installed in the corresponding U-shaped grooves 7. When the plug 4 is rotated, the cylindrical locking pins 5 enter the ring groove 8, so that the plug 4 is firmly connected to the upper mold 1.

[0012] Furthermore, the lower model core 10 is a cylindrical structure used to support the metal part. Two symmetrical planes along the axial direction are provided on the outer circular surface, which are the same as the shape of the inner hole of the metal part. An annular groove is provided at the bottom of the lower model core 10 to match the bottom structure of the metal part.

[0013] Furthermore, the lower mold 3 contacts the operating table, and its bottom surface is a planar structure.

[0014] Furthermore, the middle mold 2 has a symmetrical "H" structure, forming a clearance fit structure with the upper mold 1 and the lower mold 3.

[0015] Furthermore, the lower end of the upper mold 1 is provided with an arc-shaped surface with a radius of R, and the arc-shaped surface forms a cavity with the bottom surface of the plug, the inner wall surface of the middle mold 2, and the upper surface of the lower mold 3.

[0016] Furthermore, external threads are provided on the outer sides of the upper mold 1 and the lower mold 3, and internal threads are provided at both ends of the inner circle of the outer hoop 6. The upper mold 1 and the lower mold 3 are threadedly connected through the internal threads at both ends of the inner circle of the outer hoop 6.

[0017] Furthermore, a circular through hole 14 is provided at the upper end of the plug 4.

[0018] Furthermore, the upper outer surface of the upper mold 1 is provided with upper mold knurling 9, and the lower outer surface of the lower mold 3 is provided with lower mold knurling 12.

[0019] Beneficial effects

[0020] This invention proposes a rotating, thin-film polyurethane float molding and curing mold with metal components. Compared to existing technologies, this mold adopts a rotating structure, forming a semi-open cavity through an upper mold, middle mold, and lower mold. The upper and lower molds are locked and closed by an external hoop with internal threads. After pouring in the polyurethane premix, a plug with a locking pin is inserted, forming a completely closed mold cavity, which then cures after the polyurethane foams.

[0021] Using this mold structure makes the production of thin polyurethane floats with metal parts simple, easy to mold, and produces high-quality products, meeting the needs of mass production and customer product assembly.

[0022] The float product molding and curing mold of this utility model is highly efficient, simple and convenient to operate, and has stable and reliable quality during the production process, which can meet the needs of mass production and processing of thin polyurethane float products with metal parts. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the molding and curing process of a thin polyurethane float product with metal parts, which is a rotating body according to an embodiment of the present invention.

[0024] Figure 2 This is a sectional view of the upper mold;

[0025] Figure 3 This is the outline drawing of the upper mold;

[0026] Figure 4 This is a top view of the upper mold;

[0027] Figure 5 This is a sectional view of the intermediate mold;

[0028] Figure 6 This is a sectional view of the lower mold;

[0029] Figure 7 This is the outline drawing of the lower mold;

[0030] Figure 8 yes Figure 6 A top-down enlarged view along direction A;

[0031] Figure 9 yes Figure 6 Enlarged view of the circled area;

[0032] Figure 10 This is a cross-sectional view of the plug;

[0033] Figure 11 This is a side view of the plug;

[0034] Figure 12 This is a top view of the end cap;

[0035] Figure 13 This is a sectional view of the outer hoop;

[0036] Among them, 1. Upper mold; 2. Middle mold; 3. Lower mold; 4. Plug; 5. Locking pin; 6. Outer hoop; 7. U-shaped groove; 8. Inner ring groove; 9. Upper mold knurling; 10. Lower mold core; 11. Lower mold boss; 12. Lower mold knurling; 13. Through hole; 14. Circular through hole; 15. Outer hoop internal thread. Detailed Implementation

[0037] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0038] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] Figure 1-13 This is a schematic diagram illustrating the molding and curing process of a thin polyurethane float product with metal components, representing an embodiment of the present invention. See the attached specification. Figure 1-6 This utility model provides a technical solution:

[0040] Example 1: A molding and curing mold for a thin polyurethane float product with metal parts includes a plug 4 for blocking the pouring gate of the float product mold. The plug is equipped with two cylindrical locking pins 5. The two locking pins 5 are interference-fitted with the plug 4 in the 180° direction. When the plug 4 is installed after the fit is complete, the locking pins 5 and the upper mold 1 are inserted into the U-shaped groove 7. After insertion, they are rotated and locked into the inner ring groove 8 of the upper mold, thus sealing the pouring gate of the polyurethane float product mold. Together with the upper mold 1, the middle mold 2 and the lower mold 3, the cavity is completely closed.

[0041] The lower mold 3 contacts the operating table, and its bottom surface is a flat structure, providing overall support for the mold during operation. The lower mold 3 also contains the product cavity and a positioning core that supports the metal part. The middle mold has a symmetrical "H" structure, with the product cavity on its inner side. It forms a clearance fit with the upper mold 1 and lower mold 3, allowing for interchangeable use in the vertical direction for easy operation without affecting the product molding quality. The lower part R of the upper mold 1 contains the product cavity, and its outer side, like the lower mold 3, has external threads. These threads engage with the internal thread 15 of the outer clamp 6, locking the upper mold 1, middle mold 2, and lower mold 3 together.

[0042] In the molding process of polyurethane float products, the lower mold 3 is placed on the operating platform, and then the metal part is carefully and slowly placed on the core 10 in the middle of the mold and pressed to the bottom. The middle mold 2 is then inserted and mates with the boss 11 of the lower mold 3 through a clearance fit structure. The outer clamp 6 is fitted from top to bottom onto the upper end of the external thread of the lower mold, and then rotated until it is fully engaged at the bottom of the external thread. At this time, the upper mold 1 is inserted, and the lower end of the external thread of the upper mold 1 contacts the upper end of the internal thread on the upper side of the outer clamp 6. The upper mold 1 is then rotated until it is fully engaged with the middle mold 2. Then, the polyurethane float premix is ​​poured into the middle hole of the upper mold 1. After pouring, the plug 4 is installed into the U-shaped groove 7 of the upper mold 1. After rotation, it engages with the inner ring groove 8 and locks in place, forming a completely closed cavity for the foaming and molding of the polyurethane float product.

[0043] In Example 2, when the polyurethane float product is cured and ready for demolding, the internal pressure of the cavity increases after the float foams, causing the plug 4 to shift upwards. At this time, the inner locking pin 5 of the plug presses against the upper side of the inner ring groove 8, preventing the operator from manually rotating the plug 4 to open the mold. To solve this problem, a circular through hole 14 is designed at the upper end of the plug 4. An auxiliary metal rod can be inserted into it to generate a strong torque, allowing the plug 4 to be easily removed by hand by rotating the metal rod.

[0044] In Example 3, during the molding process of polyurethane float products, there will be excess raw materials and gas in the cavity after foaming that need to be discharged. In order to facilitate this, a through hole 13 for venting and overflow is provided at the center of the plug 4.

[0045] In Example 4, during the assembly of the curing mold for polyurethane float products, the operator may encounter problems when manually assembling the upper mold 1 and lower mold 3. This can lead to insufficient force due to sliding, resulting in difficulty in mold assembly and incomplete closure. Excessive gaps cause more polyurethane raw material to overflow, leading to thickened burrs. In severe cases, this can affect the total weight of the product, resulting in defective products. To address this, knurling 9 and knurling 12 are designed and machined on the upper end of the upper mold 1 and the lower end of the lower mold 3. This increases friction during operation, helping to ensure a tighter mold fit and guaranteeing the foaming quality of the polyurethane float products.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A molding and curing mold for a thin polyurethane float product with metal parts, characterized in that, It includes an upper mold, a middle mold, a lower mold, and a plug. The upper mold and the lower mold are connected by an outer hoop. The middle mold is set between the upper mold and the lower mold. The plug is set inside the upper mold. The upper mold, the plug, the middle mold, and the lower mold form a cavity. The lower mold core is set on the top of the lower mold and is located inside the cavity. The bottom end face of the plug is provided with a through hole, and the cavity communicates with the outside through the through hole.

2. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, Two cylindrical pins are provided on the outer circular surface of the plug. The two cylindrical pins are symmetrically distributed at 180° and are interference-fitted with the mounting holes on the plug.

3. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 2, characterized in that, An inner ring groove is provided on the inner circular surface of the upper mold, and two symmetrical U-shaped grooves are provided on the inner ring groove. The positions of the two U-shaped grooves correspond to the positions of two cylindrical locking pins on the outer circular surface of the plug. When installing the plug, the two cylindrical locking pins of the plug are installed in the corresponding U-shaped grooves. When the plug is rotated, the cylindrical locking pins enter the ring groove, so that the plug is firmly connected to the upper mold.

4. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, The lower mold core is a cylindrical structure used to support the metal parts. Two symmetrical planes along the axial direction are set on the outer circular surface, which are the same as the shape of the inner hole of the metal parts. An annular groove is set at the bottom of the lower mold core to match the bottom structure of the metal parts.

5. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, The lower mold contacts the operating table, and its bottom surface is a flat structure.

6. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, The middle mold has a symmetrical "H" structure, forming a clearance fit with the upper and lower molds.

7. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, The lower end of the upper mold has an arc-shaped surface with a radius of R, which forms a cavity with the bottom surface of the plug, the inner wall of the middle mold, and the upper surface of the lower mold.

8. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, External threads are provided on the outer sides of the upper and lower dies, and internal threads are provided at both ends of the inner circle of the outer hoop. The upper and lower dies are threadedly connected through the internal threads at both ends of the inner circle of the outer hoop.

9. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, A circular through hole is provided at the upper end of the plug.

10. The molding and curing mold for a thin polyurethane float product with metal parts as described in claim 1, characterized in that, The upper outer surface of the upper mold is knurled, and the lower outer surface of the lower mold is knurled.

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