Rear mold assembly for impeller injection molding machining
By optimizing the design of the rear mold assembly for impeller injection molding and adopting a combination of slider assembly and ejector assembly, the problem of low demolding efficiency of impeller molds was solved, and efficient and low-cost impeller production was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-10
AI Technical Summary
Existing impeller injection molds are inefficient, complex to operate, and costly during demolding, making it difficult to meet the demands for high-precision and high-efficiency production.
Design a rear mold assembly for impeller injection molding, including a fixed plate, side plates, integrated plate, mold core, slider assembly, and ejector assembly. Automatic core pulling is achieved through the cross-shaped arrangement of the slider assembly. Combined with the ejector assembly and cooling water channel, demolding efficiency and accuracy are improved.
This technology enables rapid prototyping and demolding of impellers, improving production efficiency and product precision while reducing production costs.
Smart Images
Figure CN223982093U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a rear mold assembly for impeller injection molding, belonging to the field of injection mold technology. Background Technology
[0002] Injection molding is a commonly used method for producing plastic products in modern industrial production. First, a corresponding injection mold is manufactured according to the product shape. Molten plastic is then injected into the mold cavity. A cooling system cools and solidifies the molten plastic to form the desired injection-molded product. The mold is then opened, and the product is removed. Injection-molded products offer high precision, meeting the diverse needs of various industries. A single injection mold can be reused multiple times, resulting in low production costs and widespread acceptance among businesses. For automotive parts manufacturers, in the context of lightweighting and cost reduction in automobiles, many parts that were originally made of metal are now made of plastic and processed into specific shapes using injection molds. Impellers are common automotive parts, therefore, injection molds for impeller production are also a widely used and important type of mold in automotive parts manufacturing companies. Due to the thin blade structure of impellers, the injection molding process is relatively complex, requiring extremely high dynamic balance values and demanding high standards in the design of the injection mold.
[0003] The process of smoothly separating the cured plastic impeller from the mold is called demolding. Due to the complex structure of the impeller, the twisted shape of the blades, and the slow cooling rate, removing the impeller product from existing impeller molds is quite troublesome. Sometimes, manual demolding is used to complete the final step of the injection molding process, requiring operators to use hand tools such as screwdrivers and flat-nose pliers to remove the plastic part from the mold. However, this requires a high level of skill from the operators, has low demolding efficiency, and is labor-intensive. Some injection molds use side core-pulling components to complete the demolding action. However, in order to ensure that the impeller can smoothly detach from the molding insert, the side core-pulling component must ensure that the molding insert has sufficient stroke, which makes the entire injection mold very large and the manufacturing cost high. Moreover, the impeller after side core-pulling remains tightly attached to the base surface. Because the outer wall is relatively thin, there is no good material removal point, which still causes difficulties in material removal, and the efficiency of injection molding demolding is not improved. Summary of the Invention
[0004] In order to overcome the shortcomings of the prior art, this utility model provides a rear mold assembly for impeller injection molding.
[0005] The technical solution adopted in this utility model is as follows: A rear mold assembly for impeller injection molding is designed to cooperate with a front mold assembly to produce a six-bladed impeller. It includes a fixed plate, side plates, an integrated plate, a mold core, a first slider assembly, a second slider assembly, an ejector assembly, and impeller fittings. Side plates are respectively provided on opposite sides of the fixed plate, and the integrated plate is provided on both side plates. The mold core is provided on the integrated plate. A set of first slider assemblies is respectively provided on opposite sides of the mold core, and a set of second slider assemblies is respectively provided on the other opposite side. The first slider assembly and the second slider assembly are... The impeller assembly is slidably connected to the integrated plate. The impeller is slidably disposed in the middle of the mold core. The mold core is provided with a mold insert pin, which penetrates the impeller assembly. The ejector assembly is disposed between the two side plates, and the front end of the ejector assembly passes through the integrated plate and the mold core and abuts against the impeller assembly. The fixed plate is provided with an ejector hole in the middle. When the mold is closed, the two sets of first slider assemblies, the two sets of second slider assemblies, and the impeller assembly together form the rear mold cavity. The front mold assembly is provided with a front mold cavity. The rear mold cavity and the front mold cavity together form the forming cavity of the six-bladed impeller.
[0006] Furthermore, the two sets of first slider assemblies and the two sets of second slider assemblies are arranged in a cross shape. The first slider assembly includes a first slider seat and a first core-pulling slider fixedly connected thereto. The second slider assembly includes a second slider seat and a second core-pulling slider fixedly connected thereto. The first slider seat and the second slider seat are slidably connected to the integrated board, respectively.
[0007] Furthermore, the integrated plate is provided with a first slide groove for installing a first slider seat and a second slide groove for installing a second slider seat. Steps are provided on both sides of the first slide groove and the second slide groove. A first pressure strip and a second pressure strip are fixed on the steps. A first protruding ridge and a second protruding ridge are provided on the corresponding sides of the first slider seat and the second slider seat. The first protruding ridge is engaged under the first pressure strip, and the second protruding ridge is engaged under the second pressure strip, thereby realizing the sliding connection between the first slider seat and the second slider seat and the integrated plate.
[0008] Furthermore, the integrated plate is provided with a core groove, and the mold core is installed in the core groove. The mold core is provided with a first guide groove for receiving the first core-pulling slider and a second guide groove for receiving the second core-pulling slider. The lower sides of the first core-pulling slider and the second core-pulling slider are respectively provided with a first protrusion and a second protrusion, and the first protrusion and the second protrusion are respectively inserted into the first guide groove and the second guide groove.
[0009] Furthermore, the inner end of the first core-pulling slider is provided with a first forming groove, and the inner end of the second core-pulling slider is provided with a second forming groove. The first forming groove, the second forming groove, and the impeller fitting together form the rear mold cavity.
[0010] Furthermore, the first slider seat and the second slider seat are respectively provided with oblique guide holes, and the front mold assembly is provided with corresponding oblique guide rods. The oblique guide rods move in and out of the oblique guide holes to drive the first slider seat and the second slider seat to slide.
[0011] Furthermore, the ejection assembly includes an ejection base plate, an ejection panel, guide pillars, a return spring, and ejector pins. The ejection base plate and the ejection panel are fixedly connected and clamped between two side plates. Guide pillars are respectively provided at the four corners of the ejection panel. The guide pillars penetrate the integrated plate. A return spring is provided on the guide pillar between the ejection panel and the integrated plate. Ejector pins are provided on the ejection panel. The ejector pins penetrate the integrated plate and the mold core and abut against the rear end of the impeller fitting. The four ejector pins are arranged in a rectangle.
[0012] Furthermore, the ejection assembly also includes multiple support columns, one end of which rests against the integrated plate, and the other end of which passes through the ejection base plate and the ejection panel and rests against the fixing plate. The support column is connected and fixed to the integrated plate or to the fixing plate.
[0013] Furthermore, the ejection assembly also includes limiting posts, with limiting posts respectively provided at one diagonal corner of the ejection panel, and the height of the limiting posts being lower than that of the support posts.
[0014] Furthermore, this design also includes a cooling water channel, which is arranged inside the mold core, with its inlet and outlet both extending out of the mold core and then out of the integrated plate.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] This invention optimizes and improves the rear mold assembly for producing a six-bladed impeller. By setting up the first and second slider assemblies, it facilitates the rapid forming and demolding of the impeller (the first and second slider assemblies can automatically pull the core during the mold opening process), thereby improving product accuracy and production efficiency. By setting up the ejector assembly and cooling water channels, the demolding efficiency can be further improved, achieving a certain cost reduction and efficiency improvement effect. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the isometric view of the rear mold assembly of this utility model.
[0019] Figure 2 This is a schematic cross-sectional view of the rear mold assembly of this utility model.
[0020] Figure 3 This is a schematic diagram showing the hidden part of the structure of this utility model.
[0021] Figure 4 for Figure 3 A schematic diagram from another perspective after the partial structure is hidden.
[0022] Figure 5 for Figure 4 A schematic diagram showing the hidden parts of the structure.
[0023] Figure 6 for Figure 5 A schematic diagram showing the hidden parts of the structure.
[0024] Figure 7 This is a schematic diagram of the first core-pulling slider of this utility model.
[0025] Figure 8 This is a schematic diagram of the second core-pulling slider of this utility model.
[0026] Figure 9 This is a schematic diagram of the isometric view of the impeller produced by this utility model.
[0027] Figure 10 This is a schematic diagram of the impeller produced by this utility model from another perspective, using an isometric view.
[0028] Figure 11 A schematic diagram of the rear mold assembly for producing impellers in conjunction with this utility model.
[0029] In the diagram: 1. Fixed plate; 2. Side plate; 3. Integrated plate; 4. Mold core; 5. First slider assembly; 6. Second slider assembly; 7. Ejector assembly; 8. Impeller fittings; 9. Mold insert pin; 10. Ejector hole; 11. Rear mold cavity; 12. Front mold cavity; 13. First slider seat; 14. First core-pulling slider; 15. Second slider seat; 16. Second core-pulling slider; 17. First slide groove; 18. Second slide groove; 19. First pressure strip; 20. ... 21. First protruding ridge; 22. Second protruding ridge; 23. Core groove; 24. First guide groove; 25. Second guide groove; 26. First protrusion; 27. Second protrusion; 28. First forming groove; 29. Second forming groove; 30. Inclined guide hole; 31. Inclined guide rod; 32. Ejector base plate; 33. Ejector panel; 34. Guide post; 35. Return spring; 36. Ejector pin; 37. Support post; 38. Limiting post; 39. Cooling water channel. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] Example 1
[0033] like Figure 1-2 As shown, a rear mold assembly for impeller injection molding is used in conjunction with a front mold assembly (such as...). Figure 11 As shown) to produce a six-bladed impeller (such as Figure 9-10 As shown, it includes a fixed plate 1, side plates 2, an integrated plate 3, a mold core 4, a first slider assembly 5, a second slider assembly 6, an ejection assembly 7, and an impeller fitting 8. Side plates 2 are respectively provided on opposite sides of the fixed plate 1, and the integrated plate 3 is fixedly mounted on the two side plates 2. The mold core 4 is provided on the integrated plate 3. A set of first slider assemblies 5 is respectively provided on one opposite side of the mold core 4, and a set of second slider assemblies 6 is respectively provided on the other opposite side. The first slider assembly 5 and the second slider assembly 6 are slidably connected to the integrated plate 3. The impeller fitting 8 (i.e., the part installed when the impeller is in use) A matching pump shaft replica is slidably disposed in the middle of the mold core 4. A mold insert pin 9 is disposed on the mold core 4. The mold insert pin 9 passes through the impeller fitting 8. The ejector assembly 7 is disposed between the two side plates 2. The front end of the ejector assembly 7 passes through the integrated plate 3 and the mold core 4 and abuts against the impeller fitting 8. An ejector hole 10 is disposed in the middle of the fixed plate 1. A telescopic rod (not shown in the figure) can be disposed thereon to hold the rear end of the ejector assembly 7. When demolding, the telescopic rod moves to drive the ejector assembly 7 to slide, thereby driving the impeller fitting 8 to slide, so as to eject the molded impeller product, which facilitates quick demolding.
[0034] When the mold is closed, the two sets of first slider assemblies 5, the two sets of second slider assemblies 6, and the impeller fitting 8 together form the rear mold cavity 11. The front mold assembly is provided with a front mold cavity 12. The rear mold cavity 11 and the front mold cavity 12 together form the forming cavity of the six-bladed impeller.
[0035] In this embodiment, the two sets of first slider assemblies 5 and the two sets of second slider assemblies 6 are arranged in a cross shape, which do not interfere with each other and facilitate installation design. The first slider assembly 5 includes a first slider seat 13 and a first core-pulling slider 14 fixedly connected thereto. The second slider assembly 6 includes a second slider seat 15 and a second core-pulling slider 16 fixedly connected thereto. The first slider seat 13 and the first core-pulling slider 14, as well as the second slider seat 15 and the second core-pulling slider 16, are all fixedly connected by bolts. The first slider seat 13 and the second slider seat 15 are slidably connected to the integrated plate 3 respectively.
[0036] Example 2
[0037] This embodiment, based on embodiment 1, provides a structural arrangement in which the first slider seat 13 and the second slider seat 15 are respectively slidably connected to the integrated plate 3: as follows Figure 3-8 As shown, the integrated plate 3 is provided with a first slide groove 17 for installing the first slider seat 13 and a second slide groove 18 for installing the second slider seat 15. Steps are provided on both sides of the first slide groove 17 and the second slide groove 18. A first pressure strip 19 and a second pressure strip 20 are fixed on the steps (i.e., a first pressure strip 19 is fixed on the steps on both sides of the first slide groove 17, and a second pressure strip 20 is fixed on the steps on both sides of the second slide groove 18). A first protrusion 21 and a second protrusion 22 are provided on the corresponding sides of the first slider seat 13 and the second slider seat 15 (i.e., a first protrusion 21 is provided on both sides of the first slider seat 13, and a second protrusion 22 is provided on both sides of the second slider seat 15). The first protrusion 21 is engaged under the first pressure strip 19, and the second protrusion 22 is engaged under the second pressure strip 20 (i.e., both the first pressure strip 19 and the second pressure strip 20 extend out of the steps they are on and form a sliding gap with the bottom of the corresponding slide groove), thereby realizing the sliding connection between the first slider seat 13 and the second slider seat 15 and the integrated plate 3. It is understandable that the above is just one of the structural arrangements for the first slider seat 13 and the second slider seat 15 to be slidably connected to the integrated plate 3, and there may be other sliding connection methods.
[0038] In this embodiment, the integrated plate 3 is provided with a core groove 23, and the mold core 4 is installed in the core groove 23. The mold core 4 is provided with a first guide groove 24 for receiving the first core-pulling slider 14 and a second guide groove 25 for receiving the second core-pulling slider 16. The lower sides of the first core-pulling slider 14 and the second core-pulling slider 16 are respectively provided with a first protrusion 26 and a second protrusion 27. The first protrusion 26 and the second protrusion 27 are respectively inserted into the first guide groove 24 and the second guide groove 25, so that the sliding of the first core-pulling slider 14 and the second core-pulling slider 16 is more stable and precise.
[0039] Example 3
[0040] This embodiment is a further optimization and refinement of the structure of the first slider assembly 5 and the second slider assembly 6 based on embodiment 2: the inner end of the first core-pulling slider 14 is provided with a first forming groove 28 (arc-shaped groove, corresponding to the blade of the impeller), and the inner end of the second core-pulling slider 16 is provided with a second forming groove 29 (flange groove, corresponding to the disc of the impeller). The first forming groove 28, the second forming groove 29, and the impeller fitting 8 together form the rear mold cavity 11; the second forming groove 29 is also used to lock the neck of the impeller fitting 8 to limit its sliding stroke and prevent it from being ejected from the rear mold when it is pushed out. The first slider seat 13 and the second slider seat 15 are respectively provided with inclined guide holes 30, and the front mold assembly is provided with a corresponding inclined guide rod 31. When the mold is closed and opened, the inclined guide rod 31 moves in and out of the inclined guide hole 30 to drive the first slider seat 13 and the second slider seat 15 to slide.
[0041] Example 4
[0042] This embodiment is a further optimization and refinement of the structure of the ejector component 7 based on embodiment 3:
[0043] The ejection assembly 7 includes an ejection base plate 32, an ejection panel 33, guide posts 34, a return spring 35, and ejector pins 36. The ejection base plate 32 and the ejection panel 33 are fixedly connected and locked between two side plates 2, and can slide up and down. Guide posts 34 are respectively provided at the four corners of the ejection panel 33. The guide posts 34 penetrate the integrated plate 3, making the sliding of the ejection assembly 7 more stable and reliable. A return spring 35 is provided on the guide posts 34 between the ejection panel 33 and the integrated plate 3 to facilitate the reset of the ejection assembly 7. Ejector pins 36 are provided on the ejection panel 33. The ejector pins 36 penetrate the integrated plate 3 and the mold core 4 and abut against the rear end of the impeller accessory 8 for ejecting the impeller accessory 8, thereby ejecting the impeller. The four ejector pins 36 are arranged in a rectangle so that the impeller accessory 8 is ejected evenly under force. Multiple ejector pins 36 can also be arranged in a circle.
[0044] In this embodiment, the ejection assembly 7 further includes multiple support columns 37. One end of each support column 37 abuts against the integrated plate 3, and the other end passes through the ejection base plate 32 and the ejection panel 33 and abuts against the fixing plate 1, providing more effective support for the integrated plate 3. At the same time, the ejection base plate 32 and the ejection panel 33 can slide along the support column 37. The support column 37 is connected and fixed to the integrated plate 3 or to the fixing plate 1, making the structure more stable and reliable.
[0045] In this embodiment, the ejection assembly 7 further includes limiting posts 38. Limiting posts 38 are respectively provided on one diagonal side of the ejection panel 33. The height of the limiting posts 38 is lower than that of the support posts 37, which is used to limit the ejection stroke of the ejection assembly 7.
[0046] Example 5
[0047] This embodiment is a further optimization and refinement of the rear mold component structure based on embodiment 4:
[0048] The rear mold assembly described in this embodiment also includes a cooling water channel 39, which is arranged inside the mold core 4, with its inlet and outlet both extending out of the mold core 4 and then out of the integrated plate 3. The cooling water channel 39 rapidly cools the molding impeller, facilitating demolding and improving production efficiency.
[0049] When using this application, it is combined with the front mold assembly, and the impeller is injection molded by mold closing, injection molding, cooling, mold opening and demolding.
[0050] Furthermore, in the description of this utility model, unless otherwise stated, the terms "multiple," "multiple roots," and "multiple groups" mean two or more, and "several," "several roots," and "several groups" mean one or more. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used only for descriptive purposes and should not be construed as indicating or implying relative importance.
[0051] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A back mold assembly for impeller injection molding processing, used for cooperating with a front mold assembly to produce a six-leaf impeller, characterized in that: The utility model relates to a six-leaf impeller forming device, including fixed plate, side plate, integrated board, mould core, first slider assembly, second slider assembly, ejection assembly and impeller kit, one opposite side of fixed plate respectively sets up side plate, sets up integrated board on two side plates, sets up mould core on integrated board, one opposite side of mould core respectively sets up a group of first slider assembly, another opposite side respectively sets up a group of second slider assembly, first slider assembly and second slider assembly are connected with integrated board sliding respectively, the impeller kit is slidingly arranged in the middle part of mould core, the mould core is provided with mould inlay needle, the mould inlay needle penetrates the impeller kit, the ejection assembly is arranged between two side plates, and the ejection assembly front end passes out integrated board and mould core and is resisted on the impeller kit, and the middle part of fixed plate is provided with ejection hole. When the mold is closed, the two groups of first slider assemblies and the two groups of second slider assemblies and the impeller kit jointly enclose a rear mold cavity, and the front mold assembly is provided with a front mold cavity, and the rear mold cavity and the front mold cavity jointly enclose a forming cavity of a six-leaf impeller.
2. The impeller injection-molding post-mold assembly of claim 1, wherein: The two groups of first slider assemblies and the two groups of second slider assemblies are arranged in a cross shape, the first slider assembly comprises a first slider seat and a first core-pulling slider fixedly connected to the first slider seat, and the second slider assembly comprises a second slider seat and a second core-pulling slider fixedly connected to the second slider seat.
3. The impeller injection-molding post-mold assembly of claim 2, wherein: The integrated board is provided with a first sliding groove for mounting the first slider seat and a second sliding groove for mounting the second slider seat, steps are arranged on both sides of the first sliding groove and both sides of the second sliding groove, first pressing strips and second pressing strips are fixed on the steps, respectively, first protruding edges and second protruding edges are arranged on both sides of the first slider seat and the second slider seat, respectively, the first protruding edges are clamped under the first pressing strips, and the second protruding edges are clamped under the second pressing strips, so that the first slider seat and the second slider seat are slidingly connected to the integrated board.
4. The impeller injection-molding post-mold assembly of claim 3, wherein: The integrated board is provided with a core groove, the mould core is mounted in the core groove, the mould core is provided with a first guide groove for receiving the first core-pulling slider and a second guide groove for receiving the second core-pulling slider, respectively, first protruding portions and second protruding portions are arranged on the lower sides of the first core-pulling slider and the second core-pulling slider, respectively, and the first protruding portions and the second protruding portions are clamped into the first guide groove and the second guide groove, respectively.
5. The impeller injection-molding post-mold assembly of claim 4, wherein: The inner end of the first core-pulling slider is provided with a first forming groove, the inner end of the second core-pulling slider is provided with a second forming groove, and the first forming groove, the second forming groove, and the impeller kit jointly enclose a rear mold cavity.
6. The impeller injection-molding post-mold assembly of claim 5, wherein: The first slider seat and the second slider seat are provided with inclined guide holes, respectively, the front mold assembly is provided with inclined guide rods corresponding to the inclined guide holes, the inclined guide rods are driven to move in and out of the inclined guide holes to drive the first slider seat and the second slider seat to slide.
7. The impeller injection-molding post-mold assembly of claim 6, wherein: The ejecting assembly comprises an ejecting bottom plate, an ejecting panel, guide columns, return springs and ejecting pins, the ejecting bottom plate and the ejecting panel are fixedly connected and clamped between the two side plates, the four corners of the ejecting panel are respectively provided with the guide columns, the guide columns penetrate the integrated plate, the return springs are arranged on the guide columns between the ejecting panel and the integrated plate, the ejecting panel is provided with the ejecting pins, the ejecting pins penetrate the integrated plate and the mold core and abut against the rear end of the impeller matching set, the ejecting pins are arranged in a rectangular shape.
8. The impeller injection-molding post-mold assembly of claim 7, wherein: The ejecting assembly further comprises a plurality of support columns, one end of the support column abuts against the integrated plate, the other end penetrates the ejecting bottom plate and the ejecting panel and abuts against the fixed plate, the support column is fixedly connected with the integrated plate or the fixed plate.
9. The impeller injection-molding post-mold assembly of claim 8, wherein: The ejecting assembly further comprises limiting columns, one oblique diagonal of the ejecting panel is respectively provided with the limiting column, the limiting column is lower than the support column in height.
10. The impeller injection-molding post-mold assembly of claim 9, wherein: Further comprising a cooling water channel, the cooling water channel is arranged in the mold core, and the water inlet end and the water outlet end of the cooling water channel respectively penetrate the mold core and then the integrated plate.