Variable volume mold mechanism for microcellular injection molding of automotive parts

Abstract

The application relates to the technical field of injection molds, in particular to a variable-volume mold mechanism for micro-foaming injection molding of automobile parts, which comprises a horizontally arranged bottom mounting cylinder, a top mounting disc arranged opposite to the top of the bottom mounting cylinder, and an upper mold loading, adjusting and heat dissipating mechanism arranged directly below the top mounting disc; the upper mold loading, adjusting and heat dissipating mechanism comprises an upper mold loading module, an upper mold displacement adjusting module and an upper mold backflow heat dissipating module; a lower mold positioning, loading and injection molding mechanism is arranged on the bottom mounting cylinder; the lower mold positioning, loading and injection molding mechanism comprises a lower mold positioning and loading module and a lower mold passive multi-point injection molding module. The technology adopts a variable-volume mold cavity and passive multi-point injection molding, realizes controllable micro-foaming, effectively improves product quality and yield, integrates efficient cooling and modular design, greatly improves production efficiency and universality, has compact structure and reliable control, and is suitable for automatic production of various products such as automobile parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, especially to a variable volume mold mechanism for micro-foaming injection molding of automobile parts. BACKGROUND

[0002] The demand for lightweight automobiles is increasingly urgent, and micro-foaming injection molding technology, as an effective lightweight high-strength material forming process, is continuously expanding its application range. However, in the production field of automobile parts, the traditional micro-foaming injection mold still faces many technical bottlenecks, which restricts the further improvement of product quality and production efficiency.

[0003] In the prior art, the mold cavity volume is usually fixed, which makes it difficult to accurately control the foaming and expansion process after the melt is injected. The free foaming of the material in the fixed space can easily form uneven cell structures, and even cause cell merging or collapse, which seriously affects the internal quality and surface quality of the product. At the same time, the traditional injection molding method usually uses a single gate design, which can easily produce flow marks and weld marks during the melt filling process. Especially for complex automobile parts, it is more difficult to ensure the uniformity of material distribution, which makes it difficult to achieve the ideal level of product yield.

[0004] The control method of the injection molding process also has obvious shortcomings. Most molds rely on external power sources and complex electronic control systems to drive the injection molding action, which not only increases the complexity of the equipment, but also introduces the risk of timing coordination errors. The matching precision of the injection time and the foaming and expansion stage is insufficient, which often causes unstable injection volume and affects the repeatability of the foaming process.

[0005] Low mold cooling efficiency is another major problem. Automobile parts often have large volume and wall thickness differences. The traditional cooling channel design is difficult to achieve rapid and uniform heat dissipation, which prolongs the product cooling and setting period and becomes a key factor restricting the improvement of production efficiency. In particular, in the micro-foaming injection molding process, the accuracy of temperature control directly affects the stability of the cell structure, and the existing mold often performs poorly in this regard.

[0006] In addition, the existing mold has poor versatility. Each set of mold can usually only produce products of a specific specification. When the product thickness or foaming ratio needs to be adjusted, the entire mold must be replaced, which not only increases the equipment investment cost, but also prolongs the production preparation time. Under the trend of multi-variety and small-batch production of automobile parts, this rigid design has been difficult to meet market demand.

[0007] In terms of mold closure precision protection, the traditional mold lacks effective buffering and precise positioning mechanisms. The rigid impact during mold closure can easily damage precision mold components, and insufficient positioning accuracy can directly affect the product size accuracy. These problems are particularly evident in long-term continuous production.

[0008] The present application aims to solve the technical problems in the prior art, and provides a variable volume mold mechanism for micro-foaming injection molding of automobile parts. SUMMARY

[0009] The present application aims to solve the technical problems in the prior art, and provides a variable volume mold mechanism for micro-foaming injection molding of automobile parts.

[0010] The present application has the following advantages:

[0011] The present application provides a variable volume mold mechanism for micro-foaming injection molding of automobile parts, which includes a horizontally arranged bottom mounting cylinder, a plurality of bent mounting brackets arranged at equal angles at the lower end of the bottom mounting cylinder, a plurality of fixed mounting holes arranged on each bent mounting bracket, a top mounting disc arranged opposite the upper end of the bottom mounting cylinder, a U-shaped mounting bracket arranged symmetrically at the upper end of the top mounting disc, a plurality of fixed mounting brackets connected between the upper ends of the U-shaped mounting brackets, a plurality of fixed mounting holes arranged on each fixed mounting bracket, a plurality of bent arc panels arranged at equal angles at the edge of the top mounting disc, a positioning arc panel vertically arranged at the upper end of the bottom mounting cylinder in cooperation with the bent arc panel, a positioning guide mounting column arranged on the outer side of each bent arc panel, and a positioning guide mounting groove arranged on the inner side of each positioning arc panel in cooperation with the positioning guide mounting column.

[0012] The upper model loading adjustment and heat dissipation mechanism is arranged directly below the top mounting disc.

[0013] The upper model loading adjustment and heat dissipation mechanism includes an upper model loading module, an upper model displacement adjustment module, and an upper model backflow heat dissipation module.

[0014] The lower model positioning loading and injection molding mechanism is arranged on the bottom mounting cylinder.

[0015] The lower model positioning loading and injection molding mechanism includes a lower model positioning loading module and a lower model passive multi-point injection molding module.

[0016] As a further scheme of the present application, the upper model loading module includes a loading mounting cylinder arranged directly below the top mounting disc, an injection molding upper model arranged in the loading mounting cylinder, a plurality of fixed mounting sleeves arranged at equal angles on the wall of the loading mounting cylinder, a plurality of fixed screw columns arranged on the injection molding upper model corresponding to the wall of the loading mounting cylinder, a fixed screw column movably arranged in the fixed mounting sleeve, one end of the fixed screw column fitted with the fixed screw column, the other end of the fixed screw column provided with a screwing turntable, and a plurality of groups of spring washers arranged on the fixed screw column between the screwing turntable and the fixed mounting sleeve; and the upper end of the injection molding upper model is provided with a plurality of positioning backflow cylinders, and the inner side of the loading mounting cylinder is provided with a positioning backflow hole in cooperation with the positioning backflow cylinder.

[0017] As a further scheme of the present application, the upper model displacement adjusting module comprises a plurality of reset springs arranged at equal angles on the upper end of the loading installation cylinder, a guide sliding cylinder is arranged on the top of each reset spring, the upper end of the reset spring is connected with the guide sliding cylinder, a guide sliding column is movably arranged in cooperation with the guide sliding cylinder, and the lower end of the guide sliding column is fixed on the loading installation cylinder.

[0018] As a further scheme of the present application, a synchronous adjusting limiting ring is horizontally arranged between the top mounting disc and the fixed mounting frame, the synchronous adjusting limiting ring is located directly above the guide sliding column, a plurality of adjusting telescopic columns are arranged at equal angles on the lower side of the synchronous adjusting limiting ring, and the lower end of each adjusting telescopic column is fixedly mounted on the top mounting disc.

[0019] As a further scheme of the present application, the upper model backflow heat dissipation module comprises a columnar shunt cavity arranged at the center position of the injection upper model, a ring-shaped backflow cavity is arranged at the edge position of the injection upper model, a plurality of variable-diameter shunt guide grooves are arranged at equal angles in the injection upper model outside the columnar shunt cavity, the variable-diameter shunt guide grooves farther away from the columnar shunt cavity have smaller guide radii, and the variable-diameter shunt guide grooves closer to the lower side of the injection upper model have larger guide radii, the outer ends of the variable-diameter shunt guide grooves are communicated with the ring-shaped backflow cavity through connecting guide holes, and a backflow guide hole communicated with the ring-shaped backflow cavity is arranged in the injection upper model at the lower end of the positioning backflow cylinder.

[0020] As a further scheme of the present application, the upper end of the loading installation cylinder is provided with a ring-shaped converging cylinder, the upper end of each positioning backflow hole is communicated with the ring-shaped converging cylinder, and a drain pipe is arranged in communication with the ring-shaped converging cylinder which horizontally extends out of the ring-shaped converging cylinder; a liquid supply pump is arranged at the middle position of the top mounting disc, and the upper end of the liquid supply pump is provided with an L-shaped liquid supply guide pipe.

[0021] As a further scheme of the present application, the upper end of the injection upper model is provided with a connecting guide cylinder at the middle position, the lower end of the connecting guide cylinder is communicated with the columnar shunt cavity, a connecting installation hole is arranged on the loading installation cylinder opposite to the connecting guide cylinder, the upper end of the loading installation cylinder is provided with a telescopic guide pipe, one end of the telescopic guide pipe is communicated with the connecting installation hole, and the other end of the telescopic guide pipe is communicated with the liquid supply pump.

[0022] As a further scheme of the present application, the lower model positioning loading module comprises a positioning installation cylinder arranged opposite to the loading installation cylinder, the positioning installation cylinder is fixed in the bottom installation cylinder, an injection lower model is arranged in cooperation in the positioning installation cylinder, a plurality of positioning installation columns are arranged at equal angles on the lower side of the injection lower model, and positioning installation holes are arranged on the inner bottom of the positioning installation cylinder in cooperation with the positioning installation columns.

[0023] As a further scheme of the present application, the lower model passive multi-point injection module comprises an injection installation cylinder arranged at the middle position of the lower end of the injection lower model, and the positioning installation cylinder is provided with an injection installation hole in cooperation with the injection installation cylinder.

[0024] As a further aspect of the present invention: an airtight guide ring is provided at the lower end of the wall of the loading and mounting cylinder, and an airtight guide groove is provided at the upper end of the wall of the positioning and mounting cylinder directly opposite the airtight guide ring.

[0025] As a further aspect of the present invention: a mixing chamber is provided in the middle of the positioning mounting cylinder and the bottom mounting cylinder. The upper end of the mixing chamber is connected to the injection molding mounting hole. Two sets of sliding cylinders are symmetrically arranged in the positioning mounting cylinder below the airtight guide groove. Each set of sliding cylinders is connected to the airtight guide groove through a connecting air pipe provided at its upper end. A pneumatic slider is slidably arranged inside the sliding cylinder. A spring column is provided at the lower end of the pneumatic slider. A through staggered guide hole is provided on the pneumatic slider. A liquid delivery pipe and a liquid inlet pipe are horizontally connected and connected to the sliding cylinders on both sides of the staggered guide hole. The liquid delivery pipe is connected to the mixing chamber. A replenishment pipe is connected to the outer end of the liquid inlet pipe. The replenishment pipe extends out of the bottom mounting cylinder, and a booster pump is connected in series on the replenishment pipe.

[0026] As a further embodiment of the present invention: a uniform flow distribution cavity is provided in the middle position of the injection molding lower mold, the uniform flow distribution cavity is connected to the injection molding mounting cylinder, a plurality of flow distribution conduits are provided at equal angles inside the injection molding lower mold outside the uniform flow distribution cavity, a plurality of partitioned injection molding conduits are provided at equal intervals at the upper end of the flow distribution conduits, and the upper ends of the partitioned injection molding conduits all extend out of the injection molding lower mold; a one-way overflow valve is provided inside the partitioned injection molding conduits, and a plurality of inclined guide grooves are provided at equal angles on the surface of the injection molding lower mold to match the partitioned injection molding conduits.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. Achieve controllable micro-foaming to improve product quality.

[0029] Variable volume and pressure control: The volume of the mold cavity can be dynamically changed during the injection molding process through the upper mold displacement adjustment module. This allows the mold cavity volume to be dynamically adjusted with the expansion of the melt foaming process, rather than being freely foamed in a fixed space, thereby effectively controlling the foaming process and cell structure, and improving the quality of the foamed injection molded parts.

[0030] Passive precision injection molding: The lower mold passive multi-point injection module uses air pressure generated by the mold closing action to drive valves, achieving automatic start and stop of injection. This mechanical linkage method precisely controls the injection timing and injection volume, matching the foaming and expansion process, and avoiding problems that may arise with traditional injection molding.

[0031] 2. Significantly improves production efficiency

[0032] High-efficiency integrated cooling system: The upper mold backflow heat dissipation module is designed with optimized flow channels that can quickly and evenly remove the heat from the injection molded parts and the mold, significantly shortening the product cooling and setting period, thereby improving overall production efficiency.

[0033] 3. Optimized injection molding process, improved uniformity and yield

[0034] Multi-point uniform injection molding: Through uniform distribution of the flow chamber, flow conduit, and multiple partitioned injection molding conduits, simultaneous injection molding from multiple points at the bottom of the mold is achieved. Combined with the inclined flow guide groove, it ensures that the melt can quickly and evenly cover the cavity, reducing defects such as flow marks and weld marks, effectively improving the uniformity and yield of the injection molded parts.

[0035] Buffering and precise positioning: The reset spring, guide sliding column, guide sliding cylinder, and other structures in the upper mold loading module can absorb the rigid impact during mold closing, protecting the mold components. At the same time, through multiple positioning structures, high precision of the upper and lower mold closing is ensured, further guaranteeing the product size precision and quality.

[0036] 4. Enhanced versatility and ease of use

[0037] Modular and replaceable design: The injection molding upper mold and lower mold are designed with detachable modular design, allowing the mold to quickly replace different models to adapt to the production needs of different automobile parts, improving the versatility of the mold.

[0038] Convenient adjustment: By adjusting the height of the synchronous adjustment limiting ring, the final volume of the cavity can be easily changed to adapt to the production requirements of different foaming ratios or different thickness products, with flexible operation.

[0039] 5. Automation and high reliability

[0040] Passive control reliability: The opening and closing of the lower mold injection is completely controlled by the air pressure and mechanical structure generated by the mold closing action itself, without the need for additional complex electrical control or timing control. The system is simple, reliable, and has low failure rate.

[0041] Integrated design: The entire mechanism integrates injection molding, foaming, cooling, and other functions, with compact structure, which is conducive to automated production. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0043] Figure 1 It is a side view of a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0044] Figure 2 It is a side view of a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0045] Figure 3 It is a three-dimensional structure diagram of the upper model loading and adjusting heat dissipation mechanism in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0046] Figure 4 It is a partial sectional view of the upper model loading and adjusting heat dissipation mechanism in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories at the loading installation cylinder.

[0047] Figure 5 It is Figure 4 Another perspective view.

[0048] Figure 6 It is a partial sectional view of the upper model loading and adjusting heat dissipation mechanism in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories without loading installation cylinder.

[0049] Figure 7 It is Figure 5 Enlarged view at a in

[0050] Figure 8 It is Figure 6 Enlarged view at b in

[0051] Figure 9 It is a three-dimensional structure diagram of the injection molding upper model in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0052] Figure 10 It is a partial sectional view of the injection molding upper model in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0053] Figure 11 It is a three-dimensional structure diagram of the lower model positioning and loading injection molding mechanism in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0054] Figure 12 It is a three-dimensional structure diagram of the lower model positioning and loading injection molding mechanism in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories without injection molding lower model.

[0055] Figure 13 It is a partial sectional view of the injection molding lower model in the variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0056] Figure 14 It isFigure 12 Enlarged view at c.

[0057] Figure 15 It is a three-dimensional structure schematic diagram of the pneumatic slider in the variable volume mold mechanism for micro-foaming injection molding of an automobile accessory.

[0058] Figure 16 It is Figure 13 Enlarged view at d.

[0059] 1-bottom mounting cylinder, 2-bent mounting rack, 3-U-shaped mounting rack, 4-fixed mounting rack, 5-top mounting disc, 6-bent cambered panel, 7-positioning cambered panel, 8-positioning guide mounting column, 9-positioning guide mounting groove, 10-loading mounting cylinder, 11-synchronous adjustment limiting ring, 12-adjustable telescopic column, 13-drainage pipe, 14-positioning mounting cylinder, 15-guide sliding column, 16-guide sliding cylinder, 17-return spring, 18-inclined flow guide groove, 19-ring-shaped converging cylinder, 20-injection upper mold, 21-positioning backflow cylinder, 22-connection flow guide cylinder, 23-telescopic guide pipe, 24-liquid supply pump, 25-L-shaped liquid supply guide pipe, 26-fixed mounting sleeve, 27-fixed stud, 28-spring washer, 29-rotary dial, 30-fixed screw cylinder, 31-positioning backflow hole, 32-connection mounting hole, 33-cylindrical shunt cavity, 34-variable-diameter shunt guide groove, 35-ring-shaped backflow cavity, 36-backflow flow guide hole, 37-airtight guide ring, 38-airtight guide groove, 39-injection lower mold, 40-positioning mounting hole, 41-mixing cavity, 42-injection mounting hole, 43-liquid delivery pipeline, 44-uniform shunt cavity, 45-injection mounting cylinder, 46-communication air pipe, 47-sliding air cylinder, 48-pneumatic slider, 49-liquid inlet pipeline, 50-boosting pump, 51-liquid supplement pipe, 52-misaligned flow guide hole, 53-spring column, 54-shunt guide pipe, 55-positioning mounting column, 56-zoned injection guide pipe, 57-one-way overflow valve. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or like reference numerals represent the same or like elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0061] The following disclosure provides a number of different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of the specific examples are described below. Of course, they are merely examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0062] Embodiment one, please refer to Figures 1 to 6 And Figures 11 to 13 In the embodiment of the present application, a variable volume mold mechanism for micro-foaming injection molding of automobile parts comprises a horizontally arranged bottom mounting cylinder 1, a plurality of bent mounting frames 2 are arranged at equal angles at the lower end of the bottom mounting cylinder 1, a plurality of fixed mounting holes are arranged on the bent mounting frames 2, a top mounting disc 5 is arranged opposite the upper side of the bottom mounting cylinder 1, U-shaped mounting frames 3 are symmetrically arranged at the upper end of the top mounting disc 5, a plurality of groups of fixed mounting frames 4 are connected and arranged between the upper ends of the U-shaped mounting frames 3, a plurality of fixed mounting holes are also arranged on the fixed mounting frames 4, a plurality of bent arc panels 6 are arranged at equal angles at the edge of the top mounting disc 5, a positioning arc panel 7 is vertically arranged at the upper end of the bottom mounting cylinder 1 in cooperation with the bent arc panel 6, a positioning guide mounting column 8 is arranged on the outer side of the bent arc panel 6, and a positioning guide mounting groove 9 is arranged on the inner side of the positioning arc panel 7 in cooperation with the positioning guide mounting column 8, and further comprising:

[0063] The upper model loading adjustment and heat dissipation mechanism is arranged directly below the top mounting disc 5;

[0064] The upper model loading adjustment and heat dissipation mechanism comprises an upper model loading module, an upper model displacement adjustment module, and an upper model backflow heat dissipation module;

[0065] The lower model positioning and loading injection molding mechanism is arranged on the bottom mounting cylinder 1;

[0066] The lower model positioning and loading injection molding mechanism comprises a lower model positioning and loading module and a lower model passive multi-point injection molding module.

[0067] The top mounting disc 5 is installed on the external equipment capable of achieving lifting adjustment through the fixed mounting frames 4 and the fixed mounting holes thereon, and the bottom mounting cylinder 1 is fixedly installed through the bent mounting frames 2 and the fixed mounting holes thereon; and under the lifting provided by the external equipment, the installation of the injection molding upper model 20 is performed in cooperation with the upper model loading module, the installation of the injection molding lower model 39 is performed in cooperation with the lower model positioning and loading module, and the adjustment is performed through the upper model displacement adjustment module according to the micro-foaming process and the thickness requirement of the injection molding;

[0068] When the upper injection mold 20 and the lower injection mold 39 are closed, the multi-point injection is performed by the lower mold passive multi-point injection mold module, and the injection process is completed when the upper injection mold 20 is lifted to the position limited by the upper mold displacement adjusting module as the micro-foamed material expands during the injection;

[0069] Meanwhile, the heat of the micro-foamed injection part can be conducted out in time through the upper mold backflow heat dissipation module, the heat dissipation forming cycle is shortened, the upper injection mold 20 is lifted, and the rapid demolding is performed through the external mechanical hand or other demolding mechanism.

[0070] In the embodiment two, on the basis of the embodiment one, please refer to Figures 1 to 6 In the embodiment, the upper mold loading module comprises a loading installation cylinder 10 arranged below the top installation disc 5, the upper injection mold 20 is arranged in the loading installation cylinder 10, a plurality of fixed installation sleeves 26 are arranged on the cylinder wall of the loading installation cylinder 10 at equal angles, a plurality of fixed screw cylinders 30 are arranged on the upper injection mold 20 corresponding to the cylinder wall of the loading installation cylinder 10, a fixed screw column 27 is movably arranged in the fixed installation sleeve 26, one end of the fixed screw column 27 is matched with the fixed screw cylinder 30, the other end of the fixed screw column 27 is provided with a screwing turntable 29, a plurality of groups of spring washers 28 are sleeved on the fixed screw column 27 between the screwing turntable 29 and the fixed installation sleeve 26; a plurality of positioning backflow cylinders 21 are arranged on the upper end of the upper injection mold 20 at equal angles, and a positioning backflow hole 31 is arranged on the inner side of the loading installation cylinder 10 corresponding to the positioning backflow cylinder 21;

[0071] The upper mold displacement adjusting module comprises a plurality of reset springs 17 arranged at equal angles on the upper end of the loading installation cylinder 10, a guiding sliding cylinder 16 is arranged on the top installation disc 5 opposite to the reset spring 17, the upper end of the reset spring 17 is connected with the guiding sliding cylinder 16, a guiding sliding column 15 is movably arranged in cooperation with the guiding sliding cylinder 16, and the lower end of the guiding sliding column 15 is fixed on the loading installation cylinder 10;

[0072] The synchronous adjusting limiting ring 11 is arranged horizontally between the top installation disc 5 and the fixed installation frame 4, the synchronous adjusting limiting ring 11 is located directly above the guiding sliding column 15, a plurality of adjusting telescopic columns 12 are arranged at equal angles on the lower side of the synchronous adjusting limiting ring 11, and the lower end of the adjusting telescopic column 12 is fixedly installed on the top installation disc 5.

[0073] The installation process of the injection mold 20 is as follows: First, the positioning return cylinder 21 is inserted into the positioning return hole 31 to complete the positioning and installation of the injection mold 20. Then, the fixing screw 27 is inserted in conjunction with the fixing mounting sleeve 26 and the fixing screw 30. The fixing screw 27 is rotated by the screw turntable 29 to make it fit with the fixing screw 30 for screwing and fixing. The number of spring washers 28 can be adjusted according to the different sizes of the injection mold 20 to ensure that the injection mold 20 is in the accurate working position while ensuring tightness.

[0074] The external device that realizes the lifting adjustment is used for lifting adjustment. When the loading and mounting cylinder 10 is squeezed by force, the return spring 17 is squeezed by force. At this time, the guide sliding column 15 slides and changes position in the guide sliding cylinder 16, thereby offsetting the rigid impact during mold closing and ensuring the safety of the mechanism components. By adjusting the extension and retraction adjustment of the telescopic column 12, the position of the synchronous adjustment limit ring 11 can be controlled, which can limit the extreme position of the guide sliding column 15. On the one hand, the mold closing volume can be adjusted, and on the other hand, the foaming quality of the micro-foamed injection molded part can be adjusted.

[0075] Example 3, based on Example 2, please refer to... Figures 4 to 10 In this embodiment of the invention, the upper model recirculation heat dissipation module includes a columnar diversion cavity 33 located at the center of the injection molded upper model 20, an annular recirculation cavity 35 located at the edge of the injection molded upper model 20, and a plurality of variable diameter diversion guide grooves 34 arranged at equal angles in the injection molded upper model 20 outside the columnar diversion cavity 33. The guide radius of the variable diameter diversion guide grooves 34 is smaller the further away from the columnar diversion cavity 33, and the closer to the lower side of the injection molded upper model 20, the more the outer ends of the variable diameter diversion guide grooves 34 are connected to the annular recirculation cavity 35 through connecting guide holes. The lower end of the positioning recirculation cylinder 21 is provided with recirculation guide holes 36 that are connected to the annular recirculation cavity 35 in the injection molded upper model 20.

[0076] The upper end of the loading and mounting cylinder 10 is provided with an annular manifold 19, and the upper ends of the positioning return holes 31 are all connected to the annular manifold 19. The annular manifold 19 extends horizontally and is connected to a drain pipe 13. The middle position of the top mounting plate 5 is provided with a liquid supply pump 24, and the upper end of the liquid supply pump 24 is provided with an L-shaped liquid supply conduit 25.

[0077] A connecting guide tube 22 is provided at the middle of the upper end of the injection molding upper mold 20. The lower end of the connecting guide tube 22 is connected to the columnar diversion cavity 33. A connecting installation hole 32 is provided on the loading and mounting cylinder 10 directly opposite the connecting guide tube 22. A telescopic guide tube 23 is provided at the upper end of the loading and mounting cylinder 10. One end of the telescopic guide tube 23 is connected to the connecting installation hole 32, and the other end of the telescopic guide tube 23 is connected to the liquid supply pump 24.

[0078] The L-shaped liquid supply conduit 25 is communicated with external liquid supply equipment or liquid storage equipment, and the liquid is introduced at high speed by starting the liquid supply pump 24, and then introduced into the columnar distribution cavity 33 through the telescopic conduit 23, and then dispersedly guided through the variable-diameter distribution guide grooves 34, so that the heat of the upper injection mold 20, the lower injection mold 39 and the injection part therebetween is absorbed in time, and then gathered and guided into the annular return cavity 35, and then guided into the positioning return cylinder 21 through the return guide hole 36, and finally guided out of the drain pipe 13 through the positioning return hole 31 and the annular converging cylinder 19, so that the cooling forming efficiency of injection molding is improved.

[0079] The farther away from the columnar distribution cavity 33, the smaller the guide radius of the variable-diameter distribution guide groove 34, and the closer to the lower side of the upper injection mold 20, the faster the flow speed of the injection part, and the more heat is taken away, so that the cooling quality of the injection part is significantly improved.

[0080] In the embodiment four, on the basis of the embodiment three, please refer to Figures 11 to 16 In the embodiment, the lower mold positioning and loading module comprises a positioning and mounting cylinder 14 which is arranged opposite to the loading and mounting cylinder 10, and the positioning and mounting cylinder 14 is fixed in the bottom mounting cylinder 1, and the positioning and mounting cylinder 14 is matched with the injection lower mold 39 arranged in the inside, and a plurality of positioning and mounting columns 55 are arranged at equal angles on the lower side of the injection lower mold 39, and a plurality of positioning and mounting holes 40 are arranged on the inner side and bottom of the positioning and mounting cylinder 14 and matched with the positioning and mounting columns 55.

[0081] The lower mold passive multi-point injection module comprises an injection mounting cylinder 45 arranged at the lower end of the injection lower mold 39, and the positioning and mounting cylinder 14 is matched with the injection mounting cylinder 45 to form an injection mounting hole 42, and the cylinder wall of the loading and mounting cylinder 10 is provided with an air-tight guide ring 37 at the lower end, and the air-tight guide ring 37 is matched with an air-tight guide groove 38 arranged at the upper end of the cylinder wall of the positioning and mounting cylinder 14.

[0082] The middle positions of the positioning and mounting cylinder 14 and the bottom mounting cylinder 1 are provided with a mixing cavity 41, the upper end of the mixing cavity 41 is communicated with the injection mounting hole 42, two groups of sliding air cylinders 47 are symmetrically arranged in the positioning and mounting cylinder 14 below the air-tight guide groove 38, each group of sliding air cylinders 47 is communicated with the air-tight guide groove 38 through a communication air pipe 46 arranged at the upper end, a pneumatic sliding block 48 is slidably arranged in the sliding air cylinder 47, a spring column 53 is arranged at the lower end of the pneumatic sliding block 48, a misaligned guide hole 52 is arranged through the pneumatic sliding block 48, a liquid feeding pipeline 43 and a liquid inlet pipeline 49 are horizontally and oppositely arranged and communicated on the sliding air cylinder 47 on both sides of the misaligned guide hole 52, the liquid feeding pipeline 43 is communicated with the mixing cavity 41, a liquid supplementing pipe 51 is arranged at the outer end of the liquid inlet pipeline 49, the liquid supplementing pipe 51 extends out of the bottom mounting cylinder 1, and a booster pump 50 is connected in series on the liquid supplementing pipe 51.

[0083] The middle position of the injection molding lower mold 39 is provided with a uniform distribution cavity 44, which is in communication with an injection molding mounting cylinder 45. A plurality of distribution guide pipes 54 are arranged at equal angles in the injection molding lower mold 39 outside the uniform distribution cavity 44. The upper ends of the distribution guide pipes 54 are provided with a plurality of partition injection guide pipes 56 at equal intervals, and the upper ends of the partition injection guide pipes 56 extend out of the injection molding lower mold 39. The inside of each partition injection guide pipe 56 is provided with a one-way overflow valve 57, and the surface of the injection molding lower mold 39 is provided with a plurality of inclined flow grooves 18 at equal angles in cooperation with the partition injection guide pipes 56.

[0084] Firstly, the positioning and installation of the injection molding lower mold 39 is realized under the cooperation of the positioning and mounting columns 55 and the positioning and mounting holes 40. At this time, the injection molding mounting cylinder 45 is inserted into the injection molding mounting hole 42, and the liquid supplement pipes 51 on both sides are in communication with the external feeding or storage equipment, and the liquid is introduced into the liquid supplement pipes 51 through the booster pump 50.

[0085] Then, under the driving of the external lifting equipment, the top mounting disc 5, the loading mounting cylinder 10 and the injection molding upper mold 20 thereon are clamped. At this time, the positioning and guiding mounting columns 8 outside the bending arc panels 6 cooperate with the positioning and guiding mounting grooves 9 inside the positioning arc panels 7, so that the clamping precision of the injection molding upper mold 20 and the injection molding lower mold 39 is ensured.

[0086] At the same time, the airtight guide ring 37 on the loading mounting cylinder 10 is inserted into the airtight guide groove 38 on the positioning and mounting cylinder 14. On the one hand, it further improves the clamping precision, and on the other hand, it increases the pressure in the airtight guide groove 38, so that the high pressure inside it drives the pneumatic slider 48 to slide in the sliding cylinder 47, and at the same time, it extrudes the spring column 53 at the lower end. Until the misaligned flow guide hole 52 is in communication with the liquid feeding pipeline 43 and the liquid inlet pipeline 49, the pressurized raw materials enter the mixing cavity 41 through the liquid inlet pipeline 49, the misaligned flow guide hole 52 and the liquid feeding pipeline 43, and then enter the uniform distribution cavity 44 through the injection molding mounting cylinder 45 and the injection molding mounting hole 42. With the increase of the mixed raw materials, they are uniformly introduced into the distribution guide pipes 54 and the partition injection guide pipes 56, until the preset pressure of the one-way overflow valve 57 is exceeded, and then they are sprayed into the space of the clamped mold. With the contact of the mixed raw materials in the clamping space with air, the foam is expanded within the displacement limitation range of the synchronous adjusting limiting ring 11, the foaming state is controlled, and the airtight guide ring 37 gradually moves away from the airtight guide groove 38 during the displacement process, the spring column 53 extrudes the pneumatic slider 48 to reset, and the raw materials are further cut off from entering the mixing cavity 41. At the same time, with the filling of the foam body into the cavity, the pressure in the clamping space increases, until the injection power is overcome, the entering of the mixed raw materials is terminated, and the upper mold backflow heat dissipation module operates synchronously and maintains for a period of time. At this time, the top mounting disc 5 and the injection molding upper mold 20 thereon are lifted, the injection molded part is taken out, and the production of the micro-foamed automobile accessory is completed.

[0087] The several inclined flow grooves 18 arranged equiangularly outside the partition injection conduit 56 can make the exported mixed raw materials uniformly flow, improve the paving uniformity of the initial state mixed raw materials, and improve the yield of the injection molded parts.

[0088] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0089] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A variable volume mold mechanism for micro-foamed injection molding of automobile parts, comprising a horizontally arranged bottom mounting cylinder, the lower end of which is provided with a plurality of bent mounting racks at equal angles, each of the bent mounting racks being provided with a plurality of fixed mounting holes, the upper side of the bottom mounting cylinder being provided opposite with a top mounting disc, the upper end of the top mounting disc being provided symmetrically with U-shaped mounting racks, the upper ends of the U-shaped mounting racks being connected with a plurality of groups of fixed mounting racks, the fixed mounting racks also being provided with a plurality of fixed mounting holes, characterized in that, The edge of the top mounting disc is provided with a plurality of bending arc panels at equal angles, the upper end of the bottom mounting cylinder is vertically provided with a positioning arc panel matched with the bending arc panel, the outer side of the bending arc panel is provided with a positioning guide mounting column, the inner side of the positioning arc panel is provided with a positioning guide mounting groove matched with the positioning guide mounting column, and the bottom mounting cylinder is further provided with a bottom model positioning loading injection mechanism. The upper model loading adjustment heat dissipation mechanism is arranged directly below the top mounting disc. The upper model loading adjustment heat dissipation mechanism comprises an upper model loading module, an upper model displacement adjustment module and an upper model backflow heat dissipation module. The bottom model positioning loading injection mechanism is arranged on the bottom mounting cylinder. The bottom model positioning loading injection mechanism comprises a bottom model positioning loading module and a bottom model passive multi-point injection module. The upper model loading module comprises a loading mounting cylinder arranged directly below the top mounting disc, an injection upper model arranged in the loading mounting cylinder, a plurality of fixed mounting sleeves arranged at equal angles on the wall of the loading mounting cylinder, a plurality of fixed screw columns arranged on the injection upper model corresponding to the loading mounting cylinder, a fixed screw column movably arranged in the fixed mounting sleeve, and a plurality of positioning backflow cylinders arranged at equal angles on the upper end of the injection upper model. The upper model displacement adjustment module comprises a plurality of reset springs arranged at equal angles on the upper end of the loading mounting cylinder, a guide sliding cylinder arranged on the top mounting disc opposite to each reset spring, a connection between the upper end of the reset spring and the guide sliding cylinder, a guide sliding column movably arranged in cooperation with the guide sliding cylinder, and a fixation of the lower end of the guide sliding column on the loading mounting cylinder. The upper model backflow heat dissipation module comprises a columnar shunt cavity arranged at a central position in the injection upper model, a ring-shaped backflow cavity arranged at an edge position of the injection upper model, a plurality of variable-diameter shunt guide grooves arranged at equal angles in the injection upper model outside the columnar shunt cavity, a smaller guide radius of the variable-diameter shunt guide groove farther away from the columnar shunt cavity, a closer to the lower side of the injection upper model, a communication between the outer end of the variable-diameter shunt guide groove and the ring-shaped backflow cavity through a connecting guide hole, and a backflow guide hole arranged in the injection upper model at the lower end of the positioning backflow cylinder and communicated with the ring-shaped backflow cavity. A connecting guide cylinder is arranged at an intermediate position on the upper end of the injection upper model, the lower end of the connecting guide cylinder is communicated with the columnar shunt cavity, a connecting mounting hole is arranged on the loading mounting cylinder opposite to the connecting guide cylinder, and an elastic guide pipe is arranged on the upper end of the loading mounting cylinder. The bottom model positioning loading module comprises a positioning mounting cylinder arranged opposite to the loading mounting cylinder, a fixation of the positioning mounting cylinder in the bottom mounting cylinder, a cooperation between the injection lower model and the positioning mounting cylinder, a plurality of positioning mounting columns arranged at equal angles on the lower side of the injection lower model, and a fixation of the positioning mounting column on the inner side bottom of the positioning mounting cylinder and a positioning mounting hole. The bottom model passive multi-point injection module comprises an injection mounting cylinder arranged at an intermediate position on the lower end of the injection lower model, and an injection mounting hole arranged in cooperation with the injection mounting cylinder.

2. The variable volume mold mechanism for microcellular injection molding of automotive parts according to claim 1, wherein, One end of the fixed screw column is matched with the fixed screw cylinder, the other end of the fixed screw column is provided with a screwing turntable, a plurality of groups of spring washers are sleeved on the fixed screw column between the screwing turntable and the fixed mounting sleeve.

3. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 1 wherein, The inner side of the loading mounting cylinder is provided with a positioning backflow hole matched with the positioning backflow cylinder.

4. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 1 wherein, A synchronous adjustment limit ring is horizontally arranged between the top mounting plate and the fixed mounting bracket. The synchronous adjustment limit ring is located directly above the guide sliding column. Several adjustable telescopic columns are arranged at equal angles on the lower side of the synchronous adjustment limit ring. The lower ends of the adjustable telescopic columns are all fixedly installed on the top mounting plate.

5. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 3 wherein, The upper end of the loading and installation cylinder is provided with an annular manifold, and the upper ends of the positioning return holes are all connected to the annular manifold. The annular manifold extends horizontally and is connected to it with a drain pipe.

6. A variable volume mold mechanism for microcellular injection molding of automotive parts according to claim 1, wherein, A liquid supply pump is located in the middle of the top mounting plate. An L-shaped liquid supply conduit is located at the upper end of the liquid supply pump. One end of the telescopic conduit is connected to the connection mounting hole, and the other end of the telescopic conduit is connected to the liquid supply pump.

7. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 5 wherein, An airtight guide ring is provided at the lower end of the wall of the loading and mounting cylinder, and an airtight guide groove is provided at the upper end of the wall of the positioning and mounting cylinder directly opposite the airtight guide ring.

8. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 7, wherein, A mixing chamber is provided in the middle of the positioning mounting cylinder and the bottom mounting cylinder. The upper end of the mixing chamber is connected to the injection molding mounting hole. Two sets of sliding cylinders are symmetrically arranged in the positioning mounting cylinder below the airtight guide groove. Each set of sliding cylinders is connected to the airtight guide groove through a connecting air pipe at its upper end. A pneumatic slider is slidably arranged inside the sliding cylinder. A spring column is provided at the lower end of the pneumatic slider. A through staggered guide hole is provided on the pneumatic slider. A liquid delivery pipe and a liquid inlet pipe are horizontally connected to the sliding cylinders on both sides of the staggered guide hole. The liquid delivery pipe is connected to the mixing chamber. A replenishment pipe is connected to the outer end of the liquid inlet pipe. The replenishment pipe extends out of the bottom mounting cylinder and a booster pump is connected in series on the replenishment pipe.

9. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 8 wherein, A uniform flow distribution cavity is provided in the middle of the injection molding lower mold. The uniform flow distribution cavity is connected to the injection molding mounting cylinder. Several flow distribution conduits are provided at equal angles inside the injection molding lower mold outside the uniform flow distribution cavity. Several partitioned injection molding conduits are provided at equal intervals at the upper end of the flow distribution conduits. The upper ends of the partitioned injection molding conduits all extend out of the injection molding lower mold.

10. The variable volume mold mechanism for microcellular injection molding of automotive parts of claim 9, wherein, Each of the partitioned injection molding conduits is equipped with a one-way overflow valve, and the surface of the injection mold is provided with several inclined guide grooves at equal angles to match the partitioned injection molding conduits.

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