Injection pipe fitting mold cooling water channel structure

Abstract

The utility model discloses a kind of injection pipe fitting mould cooling water path structure, including fixedly arranged on fixed mould plate fixed mould cavity plate, water path fixed sleeve is equipped in the fixed mould cavity plate, core is equipped in the water path fixed sleeve, and gap for product forming is equipped between the water path fixed sleeve and core;The water path fixed sleeve is equipped with product external cooling water path, for product external cooling in injection molding process;The core is equipped with core internal cooling water path, for product internal cooling in injection molding process.The utility model product external cooling water path is designed in four sections water path, and rotary type circulation pipeline arrangement is used, so that product in cooling process, reduce product due to each region cooling temperature is different, stress is too large, cause product's hot bending;Meanwhile, core internal cooling water path uses longitudinal circulation water path arrangement, maximizes control mould temperature uniform.

Description

Technical Field

[0001] This utility model relates to the field of injection molding pipe fitting mold technology, specifically to a cooling water channel structure for injection molding pipe fitting mold. Background Technology

[0002] Injection molding refers to the process of using the extrudability and moldability of plastics to feed loose granular or powdered molding materials from the hopper of an injection molding machine into a high-temperature barrel for heating and melting, making it a viscous fluid. Under the high pressure of the plunger or screw, it is injected at a high flow rate through the nozzle at the front of the barrel into a closed mold with a lower temperature. After a period of pressure holding and cooling to solidify, the mold is opened and the plastic product with a certain shape and size can be extracted from the mold cavity.

[0003] The purpose of designing the cooling water channel for injection molding pipe fittings is to enable the product to cool evenly and to be molded and demolded in a shorter time. The quality of the water channel layout will directly affect the molding quality and production cycle of the product. Impact on quality: During molding, the water channel is used to control the mold temperature, and the change in mold temperature affects the product's shrinkage deformation rate, dimensional stability, mechanical strength, stress cracking and surface quality; mainly manifested in: surface smoothness, residual stress, crystallinity, and hot bending.

[0004] Impact on production cycle: The molding process of a product mainly consists of injection molding time, holding pressure molding time, cooling molding time, and mold opening and closing time. Cooling time, which is primarily comprised of holding pressure molding time and cooling molding time, often accounts for more than 80% of the total molding time. Therefore, the rational arrangement of the mold cooling water channels has a significant impact on the production cycle. Thus, a structure for the arrangement of cooling water channels in the cavity of thick-walled products was designed. Utility Model Content

[0005] In order to solve the problems existing in the prior art, this utility model provides a reasonably designed cooling water channel structure for injection molding pipe fittings.

[0006] The technical solution of this utility model is as follows: A cooling water channel structure for an injection molding pipe fitting mold includes a fixed mold cavity plate fixedly mounted on a fixed template. The fixed mold cavity plate has a water channel fixing sleeve inside, and a core inside the water channel fixing sleeve. A gap for product molding is provided between the water channel fixing sleeve and the core. The water channel fixing sleeve has external cooling water channels for external cooling of the product during the injection molding process. The core has internal cooling water channels for internal cooling of the product during the injection molding process.

[0007] Furthermore, the external cooling water circuit of the product includes a cavity cooling water inlet, a cavity cooling water outlet, and a circulation pipe. The circulation pipe has four sections in the circumferential direction, and adjacent sections are interconnected. Water enters from one cavity cooling water inlet, circulates along the circulation pipe, and then exits from one cavity cooling water outlet.

[0008] Furthermore, the circulation pipeline is arranged to rotate around the circumference of the water channel fixing sleeve, that is, to achieve parallel dense distribution in the axial direction of the water channel fixing sleeve.

[0009] Furthermore, the internal cooling water circuit of the core includes a core cooling water inlet, a core cooling water outlet, and a circulating water circuit; the circulating water circuit is arranged along the core axis and realizes the circulation from one core cooling water inlet along the circulating water circuit, and then the water is discharged from one core cooling water outlet.

[0010] Furthermore, the circulating water circuit includes several blind holes opened inside the core and a partition plate set in the middle of the blind holes. The bottom surface of the core is fixed to the core sealing plate. The several blind holes are arranged along the inner circumference of the core and are parallel to each other. There is a gap between the top of the partition plate and the top of the blind hole. The bottom of the partition plate is flush with the bottom of the blind hole. The bottoms of several adjacent blind holes are interconnected.

[0011] Furthermore, the outer wall of the water channel fixing sleeve is provided with four installation grooves in the circumferential direction that match the circulation pipeline, and through holes are provided on the inner walls on both sides of the installation groove for connecting each section of the circulation pipeline.

[0012] Furthermore, the outer wall of the water channel fixing sleeve is provided with a sealing groove, and a sealing ring is embedded in the sealing groove to achieve a sealed connection with the fixed mold cavity plate.

[0013] Furthermore, the upper part of the core is provided with a core fixing groove, and the core fixing groove and the water channel fixing sleeve are pressed together by a fixed template.

[0014] The beneficial effects of this utility model are as follows: 1) The external cooling water channel of this utility model is designed in four sections and adopts a rotary circulation pipeline layout, which reduces the stress caused by different temperatures in each area during the cooling process, thus preventing thermal bending of the product; at the same time, the internal cooling water channel of the core adopts a longitudinal circulation water channel layout to maximize the control of uniform mold temperature.

[0015] 2) Cooling water pipes and water channels are respectively provided on the outside of the product and inside the core, so that the mold temperature is uniform, the product production quality is stable, stress cracking is reduced, and the surface smoothness of the product is improved.

[0016] 3) The mold of this utility model has excellent cooling effect, which can shorten the production cycle to a certain extent. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall internal structure of the mold of this utility model; Figure 2 This is a schematic diagram of the external cooling water circuit structure of the product of this utility model; Figure 3 This is a schematic diagram of the water channel fixing sleeve structure of this utility model; Figure 4 This is a three-dimensional structural diagram of the internal cooling water circuit of the core of this utility model; Figure 5 This is a schematic diagram of the end face structure of the internal cooling water channel of the core of this utility model; In the diagram: 1. Product; 2. Cavity cooling inlet; 3. Cavity cooling outlet; 4. Core cooling inlet; 5. Core cooling outlet; 6. Fixed template; 7. Fixed mold cavity plate; 8. Stripper plate; 9. Moving mold cavity plate; 10. Moving template; 11. Water channel fixing sleeve; 12. Core fixing groove; 13. Sealing groove; 14. Core; 15. Core sealing plate; 16. Circulation pipeline; 17. Mounting groove; 18. Through hole; 19. Blind hole; 20. Partition plate. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1-5 As shown, a cooling water channel structure for an injection molding pipe fitting mold includes: a fixed mold plate 6, a fixed mold cavity plate 7, a stripper plate 8, a moving mold cavity plate 9, a moving mold plate 10, a core fixing groove 12, a sealing groove 13, a core 14, and a core sealing plate 15. The cooling water channel structure of the mold includes a water channel fixing sleeve 11, an external cooling water channel for the product set on the water channel fixing sleeve 11, and an internal cooling water channel for the core set inside the core 14; the outer wall of the water channel fixing sleeve 11 is provided with a sealing groove 13.

[0020] The external cooling water system of the product includes cavity cooling inlet 2, cavity cooling outlet 3, and circulation pipe 16. The circulation pipe 16 is divided into four sections in the circumferential direction. Figure 2 The front side has two sections on the left and right sides, and the back side has two more sections on the left and right sides, for a total of four sections. The adjacent sections are interconnected (through circular water pipes). Water enters from a cavity cooling inlet 2, circulates along the circulation pipe 16, and exits from a cavity cooling outlet 3 (i.e., the circulation pipe 16 has only one inlet and one outlet).

[0021] The circulation pipe 16 is rotated around the circumference of the water channel fixing sleeve 11 (from... Figure 2As can be seen, there are 4 rotations, which means that they are arranged in parallel and densely along the axis of the water channel fixing sleeve 11 to improve the cooling effect.

[0022] The internal cooling water circuit of the core includes a core cooling water inlet 4, a core cooling water outlet 5, and a circulating water circuit (unlike the circulating pipe, the circulating water circuit is set by opening holes inside the core); the circulating water circuit is arranged along the axial direction of the core 14, and realizes that water circulates from one core cooling water inlet 4 along the circulating water circuit, and then exits from one core cooling water outlet 5.

[0023] The circulating water circuit includes several blind holes 19 (the top of the holes is not penetrated) opened inside the core 14 and a partition 20 set in the middle of the blind holes 19. The top of the blind holes 19 is sealed and the bottom is open. The bottom surface of the core 14 is fixed on the core sealing plate 15 to achieve a seal on the bottom surface of the core 14 (the bottom surface of the core 14 is provided with an annular core sealing groove, an O-ring is installed in the core sealing groove, and the O-ring is higher than the bottom surface of the core 14, and is pressed with the core sealing plate 15 to achieve a sealed connection). A number of blind holes 19 are arranged along the inner circumference of the core 14, and adjacent blind holes 19 are parallel to each other. The top of the partition plate 20 and the top of the blind hole 19 are left with a gap. The side of the partition plate 20 is sealed to the side of the blind hole 19 (the partition plate 20 is made of plastic and matches the diameter of the blind hole 19 to achieve a tight fit). The bottom of the partition plate 20 is flush with the bottom of the blind hole 19, and the adjacent blind holes 19 are interconnected at the bottom.

[0024] The outer wall of the water channel fixing sleeve 11 is provided with four installation grooves 17 in the circumferential direction that match the circulation pipe 16, and the inner walls on both sides of the installation groove 17 are provided with through holes 18 for connecting each section of the circulation pipe 16, that is, for the circular water pipe to pass through.

[0025] The fixed template 6 and the moving template 10 are respectively fixed to the injection molding machine. The fixed mold cavity plate 7 is fixed to the fixed template 6. The core fixing groove 12 and the water channel fixing sleeve 11 are held in place by the fixed template 6. The sealing groove 13 is inlaid with a sealing ring to prevent water leakage and achieve a sealed connection with the fixed mold cavity plate 7. The core 14 is fixed to the moving mold cavity plate 9. After the product is formed, the core 14 drives the product 1 to detach from the fixed mold cavity plate 7 by the force of the injection molding machine's mold opening action. After the mold opening is completed, the core 14 is pushed against the stripper plate 8 by the force of the injection molding machine's ejection mechanism, further detaching the core 14 from the product 1 completely, thus completing the entire process.

[0026] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A cooling water channel structure for an injection molding pipe fitting mold, comprising a fixed mold cavity plate (7) fixedly mounted on a fixed template (6), characterized in that, The fixed mold cavity plate (7) is provided with a water channel fixing sleeve (11), and the water channel fixing sleeve (11) is provided with a core (14). There is a gap between the water channel fixing sleeve (11) and the core (14) for product molding. The water channel fixing sleeve (11) is provided with external cooling water channels for external cooling of the product during injection molding. The core (14) is provided with internal cooling water channels for internal cooling of the product during injection molding.

2. The cooling water channel structure for an injection molding pipe fitting mold according to claim 1, characterized in that, The external cooling water circuit of the product includes a cavity cooling water inlet (2), a cavity cooling water outlet (3) and a circulation pipe (16). The circulation pipe (16) has four sections in the circumferential direction, and the adjacent sections are interconnected. Water enters from a cavity cooling water inlet (2), circulates along the circulation pipe (16), and then exits from a cavity cooling water outlet (3).

3. The cooling water channel structure for an injection molding pipe fitting mold according to claim 2, characterized in that, The circulation pipeline (16) is arranged to rotate around the circumference of the water channel fixing sleeve (11), that is, it is arranged in parallel and densely in the axial direction of the water channel fixing sleeve (11).

4. The cooling water channel structure for an injection molding pipe fitting mold according to claim 1, characterized in that, The cooling water path inside the core includes a core cooling water inlet (4), a core cooling water outlet (5), and a circulating water path; the circulating water path is arranged along the axial direction of the core (14) and realizes that water circulates from a core cooling water inlet (4) along the circulating water path and then exits from a core cooling water outlet (5).

5. The cooling water channel structure for an injection molding pipe fitting mold according to claim 3, characterized in that, The circulating water circuit includes several blind holes (19) opened inside the core (14) and a partition (20) set in the middle of the blind holes (19). The bottom surface of the core (14) is fixed on the core sealing plate (15). The several blind holes (19) are arranged along the circumferential direction inside the core (14) and adjacent blind holes (19) are parallel to each other. There is a gap between the top of the partition (20) and the top of the blind hole. The bottom of the partition (20) is flush with the bottom of the blind hole (19). The bottoms of the several blind holes (19) are interconnected.

6. The cooling water channel structure for an injection molding pipe fitting mold according to claim 2, characterized in that, The outer wall of the water channel fixing sleeve (11) is provided with four installation grooves (17) that match the circulation pipe (16) in the circumferential direction, and the inner walls on both sides of the installation groove (17) are provided with through holes (18) for connecting each section of the circulation pipe (16).

7. The cooling water channel structure for an injection molding pipe fitting mold according to claim 1, characterized in that, The outer wall of the water channel fixing sleeve (11) is provided with a sealing groove (13), and a sealing ring is embedded in the sealing groove (13) to achieve a sealed connection with the fixed model cavity plate (7).

8. The cooling water channel structure for an injection molding pipe fitting mold according to claim 1, characterized in that, The core (14) is provided with a core fixing groove (12) on the upper part, and the core fixing groove (12) and the water channel fixing sleeve (11) are pressed together by the fixed template (6).

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