Volume-variable mold mechanism for micro-foaming injection molding of automobile parts

Abstract

The invention 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 over the bottom mounting cylinder, an upper mold loading adjustment heat dissipation mechanism arranged under the top mounting disc, a lower mold loading adjustment heat dissipation mechanism arranged under the top mounting disc, and a lower mold loading adjustment heat dissipation mechanism arranged under the upper mold loading adjustment heat dissipation mechanism, 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 lower model positioning loading injection molding mechanism is arranged on the bottom mounting cylinder; and the lower model positioning, loading and injection molding mechanism comprises a lower model positioning and loading module and a lower model passive multi-point injection molding module. According to the technology, a variable-volume mold cavity and passive multi-point injection molding are adopted, controllable micro-foaming is achieved, and the product quality and the yield are effectively improved; and efficient cooling and modular design are integrated, the production efficiency and universality are greatly improved, the structure is compact, control is reliable, and the device is suitable for automatic production of various products such as automobile accessories.

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: 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 above the bottom mounting cylinder, a U-shaped mounting bracket symmetrically arranged 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 the bent arc panel, and a positioning guide mounting groove arranged on the inner side of the positioning arc panel in cooperation with the positioning guide mounting column. The upper mold loading adjustment and heat dissipation mechanism is arranged directly below the top mounting disc. The upper mold loading adjustment and heat dissipation mechanism includes an upper mold loading module, an upper mold displacement adjustment module, and an upper mold backflow heat dissipation module. The lower mold positioning loading and injection molding mechanism is arranged on the bottom mounting cylinder. The lower mold positioning loading and injection molding mechanism includes a lower mold positioning loading module and a lower mold passive multi-point injection molding module.

[0011] As a further scheme of the present application, the upper mold loading module includes a loading mounting cylinder arranged directly below the top mounting disc, an injection mold 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 studs arranged on the injection mold upper model corresponding to the wall of the loading mounting cylinder, a fixed stud movably arranged in the fixed mounting sleeve, one end of the fixed stud fitted with the fixed stud, the other end of the fixed stud provided with a screwing turntable, and a plurality of spring washers sleeved on the fixed stud between the screwing turntable and the fixed mounting sleeve; and the upper end of the injection mold 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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 the 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 horizontally extending 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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 positioning and mounting cylinder wall directly opposite the airtight guide ring.

[0020] 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.

[0021] 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.

[0022] Compared with the prior art, the beneficial effects of the present invention are: 1. Achieve controllable micro-foaming to improve product quality. 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.

[0023] 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.

[0024] 2. Significantly improves production efficiency High-efficiency integrated cooling system: The upper mold recirculation heat dissipation module is designed with optimized flow channels, which can quickly and evenly remove the heat from the injection molded parts and mold, significantly shortening the product cooling and setting cycle, thereby improving overall production efficiency.

[0025] 3. Optimized injection molding process, improved uniformity and yield Multi-point uniform injection molding: Through uniform distribution of the cavity, distribution of the catheter and multiple partition injection catheters, simultaneous injection from multiple points at the bottom of the mold is achieved. Combined with the inclined flow groove, it ensures that the melt can quickly and uniformly cover the cavity, reducing defects such as flow marks and weld marks, effectively improving the uniformity and yield of the injection molded parts.

[0026] 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, it ensures the high precision of the mold closing, further ensuring the product size precision and quality.

[0027] 4. Enhance versatility and ease of use 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 automotive parts, improving the versatility of the mold.

[0028] Adjustment convenience: 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.

[0029] 5. Automation and high reliability 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.

[0030] 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

[0031] 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.

[0032] Figure 1 It is a variable volume mold mechanism for a micro-foaming injection molding of an automobile accessory.

[0033] Figure 2 It is a variable volume mold mechanism for a micro-foaming injection molding of an automobile accessory.

[0034] Figure 3 It is a three-dimensional structure schematic diagram of a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0035] Figure 4 It is a partial sectional view of a variable volume mold mechanism for micro-foaming injection molding of automobile accessories at the loading installation cylinder of the model loading adjusting and heat dissipation mechanism.

[0036] Figure 5 It is Figure 4 Another perspective schematic diagram.

[0037] Figure 6 It is a partial sectional view of a variable volume mold mechanism for micro-foaming injection molding of automobile accessories without the loading installation cylinder of the model loading adjusting and heat dissipation mechanism.

[0038] Figure 7 It is Figure 5 Enlarged view at a in c.

[0039] Figure 8 It is Figure 6 Enlarged view at b in c.

[0040] Figure 9 It is a three-dimensional structure schematic diagram of an injection molding upper model in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0041] Figure 10 It is a partial sectional view schematic diagram of an injection molding upper model in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0042] Figure 11 It is a three-dimensional structure schematic diagram of a lower model positioning and loading injection mechanism in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0043] Figure 12 It is a three-dimensional structure schematic diagram of a lower model positioning and loading injection mechanism in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories without the injection molding lower model.

[0044] Figure 13 It is a partial sectional view schematic diagram of an injection molding lower model in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0045] Figure 14 It is Figure 12 Enlarged view at c in c.

[0046] Figure 15 It is a three-dimensional structure schematic diagram of a pneumatic slider in a variable volume mold mechanism for micro-foaming injection molding of automobile accessories.

[0047] Figure 16 It isFigure 13 Enlarged view at d.

[0048] 1 - bottom mounting cylinder, 2 - bent mounting bracket, 3 - U-shaped mounting bracket, 4 - fixed mounting bracket, 5 - top mounting disc, 6 - bent curved panel, 7 - positioning curved panel, 8 - positioning guide mounting column, 9 - positioning guide mounting groove, 10 - loading mounting cylinder, 11 - synchronous adjustment limiting ring, 12 - adjustment telescopic column, 13 - drain pipe, 14 - positioning mounting cylinder, 15 - guide sliding column, 16 - guide sliding cylinder, 17 - return spring, 18 - inclined flow guide groove, 19 - annular converging cylinder, 20 - injection upper mold, 21 - positioning backflow cylinder, 22 - connecting 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 - screwing turntable, 30 - fixed screw cylinder, 31 - positioning backflow hole, 32 - connecting mounting hole, 33 - columnar shunt cavity, 34 - variable-diameter shunt guide groove, 35 - annular backflow cavity, 36 - backflow flow guide hole, 37 - air-tight guide ring, 38 - air-tight 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 - booster 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

[0049] Embodiments of the present application are described in detail below with reference to several examples illustrated in the attached drawings, wherein like or similar elements are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary and are intended to be illustrative of the present application, and are not to be construed as limiting the present application.

[0050] The disclosure that follows provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of the particular examples below are described in some instances by a specific reference number. It is to be understood, however, that these specific references are meant to be illustrative and are not meant to limit the scope of the present application. Furthermore, the present application can be implemented in different embodiments that are not necessarily identical to the specific examples described below. Such variations are not to be regarded as a departure from the spirit and scope of the present application.

[0051] Embodiment One, please refer to Figures 1 to 6 and Figures 11 to 13The embodiment of the application discloses a variable-volume mold mechanism for automobile accessory micro-foaming injection molding, which comprises a horizontally arranged bottom mounting cylinder 1, a plurality of bent mounting frames 2 arranged at equal angles at the lower end of the bottom mounting cylinder 1, a plurality of fixed mounting holes arranged on the bent mounting frames 2, a top mounting disc 5 arranged opposite to the upper end of the bottom mounting cylinder 1, U-shaped mounting frames 3 arranged at the upper end of the top mounting disc 5 in a symmetrical manner, a plurality of groups of fixed mounting frames 4 connected between the upper ends of the U-shaped mounting frames 3, a plurality of fixed mounting holes arranged on the fixed mounting frames 4, a plurality of bent arc panels 6 arranged at equal angles at the edge of the top mounting disc 5, a positioning arc panel 7 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 arranged at the outer side of the bent arc panel 6, and a positioning guide mounting groove 9 arranged at the inner side of the positioning arc panel 7 in cooperation with the positioning guide mounting column 8. The upper mold loading adjusting and heat dissipation mechanism is arranged directly below the top mounting disc 5. The upper mold loading adjusting and heat dissipation mechanism comprises an upper mold loading module, an upper mold displacement adjusting module and an upper mold backflow heat dissipation module. The lower mold positioning loading and injection molding mechanism is arranged on the bottom mounting cylinder 1. The lower mold positioning loading and injection molding mechanism comprises a lower mold positioning loading module and a lower mold passive multi-point injection molding module.

[0052] The top mounting disc 5 is mounted on external equipment capable of achieving lifting adjustment through the fixed mounting frames 4 and the fixed mounting holes arranged thereon, and the bottom mounting cylinder 1 is fixedly mounted through the bent mounting frames 2 and the fixed mounting holes arranged thereon; under the lifting provided by the external equipment, the installation of the injection molding upper mold 20 is performed in cooperation with the upper mold loading module, the installation of the injection molding lower mold 39 is performed in cooperation with the lower mold positioning loading module, and the upper mold displacement adjusting module is adjusted according to the micro-foaming process and the thickness requirement of injection molding; When the injection molding upper mold 20 and the injection molding lower mold 39 are clamped, multi-point injection molding is performed through the lower mold passive multi-point injection molding module, and when the injection molding upper mold 20 is lifted to a position limited by the upper mold displacement adjusting module along with the expansion of the micro-foaming material, the injection molding process is completed; Meanwhile, the heat of the micro-foaming injection molding part can be timely conducted out through the upper mold backflow heat dissipation module, the heat dissipation forming cycle is shortened, the injection molding upper mold 20 is lifted, and rapid demolding is performed through an external mechanical hand or other demolding mechanism.

[0053] In the embodiment one, on the basis of the embodiment one, please refer to Figures 1 to 6, the upper mold loading module includes a loading installation cylinder 10 arranged below the top mounting disc 5, an injection upper mold 20 is arranged in the loading installation cylinder 10, a plurality of fixed mounting 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 injection upper mold 20 corresponding to the cylinder wall of the loading installation cylinder 10, a fixed screw column 27 is movably arranged in the fixed mounting 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 mounting sleeve 26; a plurality of positioning backflow cylinders 21 are arranged at equal angles on the upper end of the injection upper mold 20, and a positioning backflow hole 31 is arranged on the inner side of the loading installation cylinder 10 matched with the positioning backflow cylinder 21; The upper mold displacement adjusting module includes a plurality of reset springs 17 arranged at equal angles on the upper end of the loading installation cylinder 10, a guide sliding cylinder 16 is arranged on the top mounting disc 5 opposite to the reset spring 17, the upper end of the reset spring 17 is connected with the guide sliding cylinder 16, a guide sliding column 15 is movably arranged matched with the guide sliding cylinder 16, and the lower end of the guide sliding column 15 is fixed on the loading installation cylinder 10. The synchronous adjusting limiting ring 11 is arranged horizontally between the top mounting disc 5 and the fixed mounting frame 4, the synchronous adjusting limiting ring 11 is located directly above the guide 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 mounted on the top mounting disc 5.

[0054] The installation process of the injection upper mold 20 is as follows: first, the positioning backflow cylinder 21 is inserted into the positioning backflow hole 31 to complete the positioning installation of the injection upper mold 20, then the fixed mounting sleeve 26 and the fixed screw cylinder 30 are inserted into the fixed screw column 27, and the fixed screw column 27 is rotated through the screwing turntable 29 to be screwed and fixed matched with the fixed screw cylinder 30, the number of spring washers 28 can be adjusted according to the different sizes of the injection upper mold 20, so that the injection upper mold 20 is in the accurate working position while being fastened; The external equipment for lifting adjustment is lifted and adjusted, when the loading installation cylinder 10 is stressed and extruded, the reset spring 17 is stressed and extruded, at this time, the guide sliding column 15 slides in the guide sliding cylinder 16 to offset the rigid impact during mold closing, so as to ensure the safety of the mechanism components, the position of the synchronous adjusting limiting ring 11 can be controlled through the telescopic adjustment of the adjusting telescopic column 12, so as to limit the limit 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-foaming injection molded part can be adjusted.

[0055] In example three, on the basis of example two, please refer to Figures 4 to 10, the upper mold backflow heat dissipation module includes a columnar shunt cavity 33 arranged at the center position of the injection upper mold 20, a ring-shaped backflow cavity 35 arranged at the edge position of the injection upper mold 20, a plurality of variable-diameter shunt guide grooves 34 arranged at equal angles in the injection upper mold 20 outside the columnar shunt cavity 33, the variable-diameter shunt guide grooves 34 farther away from the columnar shunt cavity 33 have smaller flow radii, and the variable-diameter shunt guide grooves 34 closer to the lower side of the injection upper mold 20 have larger flow radii, the outer ends of the variable-diameter shunt guide grooves 34 are all communicated with the ring-shaped backflow cavity 35 through connecting flow guide holes, and the injection upper mold 20 at the lower end of the positioning backflow cylinder 21 is all provided with a backflow flow guide hole 36 communicated with the ring-shaped backflow cavity 35; The upper end of the loading installation cylinder 10 is provided with a ring-shaped converging cylinder 19, the upper ends of the positioning backflow holes 31 are all communicated with the ring-shaped converging cylinder 19, the ring-shaped converging cylinder 19 horizontally extends and is provided with a drain pipe 13 communicated therewith, the middle position of the top mounting disc 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 guide pipe 25. The upper end of the injection upper mold 20 is provided with a connecting flow guide cylinder 22 at the middle position, the lower end of the connecting flow guide cylinder 22 is communicated with the columnar shunt cavity 33, the connecting installation hole 32 is arranged on the loading installation cylinder 10 opposite to the connecting flow guide cylinder 22, the upper end of the loading installation cylinder 10 is provided with a telescopic guide pipe 23, one end of the telescopic guide pipe 23 is communicated with the connecting installation hole 32, and the other end of the telescopic guide pipe 23 is communicated with the liquid supply pump 24.

[0056] The L-shaped liquid supply guide pipe 25 is communicated with external liquid supply equipment or liquid storage equipment, the liquid supply pump 24 is started to make external liquid flow at high speed, the telescopic guide pipe 23 is used to guide the liquid into the columnar shunt cavity 33, the plurality of variable-diameter shunt guide grooves 34 are used to disperse and guide the flow, the heat of the injection upper mold 20, the injection lower mold 39 and the injection part therebetween during mold clamping is timely absorbed, and is guided to the ring-shaped backflow cavity 35, then is guided into the positioning backflow cylinder 21 through the backflow flow guide hole 36, and finally is guided out of the drain pipe 13 through the positioning backflow hole 31 and the ring-shaped converging cylinder 19, so that the cooling forming efficiency of injection is improved. The variable-diameter shunt guide grooves 34 farther away from the columnar shunt cavity 33 have smaller flow radii, and the variable-diameter shunt guide grooves 34 closer to the lower side of the injection upper mold 20 have larger flow radii, so that the flow speed of the injection part is faster, more heat is taken away, and the cooling quality of the injection part is improved.

[0057] In the fourth embodiment, the first to third embodiments are combined. Figures 11 to 16The lower mold positioning and loading module in the embodiment of the application comprises a positioning installation cylinder 14 arranged opposite to the loading installation cylinder 10, the positioning installation cylinder 14 is fixed in the bottom installation cylinder 1, and a lower injection mold 39 is arranged in the positioning installation cylinder 14 in a matched mode, a plurality of positioning installation columns 55 are arranged at equal angles on the lower side of the lower injection mold 39, and a plurality of positioning installation holes 40 are arranged on the inner side bottom of the positioning installation cylinder 14 in a matched mode with the positioning installation columns 55; The lower mold passive multi-point injection module comprises an injection installation cylinder 45 arranged at the lower end of the lower injection mold 39, and the positioning installation cylinder 14 is provided with an injection installation hole 42 in a matched mode with the injection installation cylinder 45; and the cylinder wall of the loading installation cylinder 10 is provided with an air-tight guide ring 37 at the lower end, and the air-tight guide ring 37 is provided with an air-tight guide groove 38 in a matched mode on the upper end of the cylinder wall of the positioning installation cylinder 14.

[0058] The positioning installation cylinder 14 and the bottom installation cylinder 1 are provided with a mixing cavity 41 at the middle position, the mixing cavity 41 is communicated with the injection installation hole 42 at the upper end, two groups of sliding air cylinders 47 are arranged in the positioning installation cylinder 14 below the air-tight guide groove 38 in a symmetrical mode, 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 arranged in the sliding air cylinder 47 in a sliding mode, a spring column 53 is arranged at the lower end of the pneumatic sliding block 48, a misaligned flow guide hole 52 is arranged through the pneumatic sliding block 48, a liquid feeding pipe 43 and a liquid inlet pipe 49 are arranged in a horizontal matched and communicated mode on the sliding air cylinder 47 on the two sides of the misaligned flow guide hole 52, the liquid feeding pipe 43 is communicated with the mixing cavity 41, the outer end of the liquid inlet pipe 49 is communicated with a liquid supplementing pipe 51, the liquid supplementing pipe 51 extends out of the bottom installation cylinder 1, and the liquid supplementing pipe 51 is provided with a booster pump 50 in a series connection mode; The middle position of the lower injection mold 39 is provided with a uniform flow distribution cavity 44, the uniform flow distribution cavity 44 is communicated with the injection installation cylinder 45, a plurality of flow distribution pipes 54 are arranged at equal angles in the lower injection mold 39 on the outer side of the uniform flow distribution cavity 44, a plurality of partitioned injection pipes 56 are arranged at equal intervals at the upper end of the flow distribution pipes 54, and the upper end of the partitioned injection pipes 56 extends out of the lower injection mold 39; the partitioned injection pipes 56 are provided with one-way overflow valves 57 in the inside, and a plurality of inclined flow guide grooves 18 are arranged at equal angles on the surface of the lower injection mold 39 in a matched mode with the partitioned injection pipes 56.

[0059] Firstly, the positioning and installation of the lower injection mold 39 is realized in a matched mode of the positioning installation column 55 and the positioning installation hole 40, at this time, the injection installation cylinder 45 is inserted into the injection installation hole 42, and the liquid supplementing pipes 51 on the two sides are communicated with the external feeding or storage equipment, and the booster pump 50 is used to guide the liquid into the liquid supplementing pipe 51; The top mounting disc 5, the loading mounting cylinder 10 and the injection upper mold 20 are clamped under the driving of the external lifting equipment. At this time, the positioning guide mounting column 8 outside the bending arc panel 6 matches the positioning guide mounting groove 9 inside the positioning arc panel 7, so that the clamping precision of the injection upper mold 20 and the injection lower mold 39 is ensured. Meanwhile, the air-tight guide ring 37 on the loading mounting cylinder 10 is inserted into the air-tight guide groove 38 on the positioning mounting cylinder 14. On the one hand, the precision of clamping is further improved, and on the other hand, the pressure in the air-tight guide groove 38 is increased, so that the high pressure inside the air-tight guide groove 38 pushes the pneumatic slider 48 to slide in the sliding cylinder 47, and at the same time, the spring column 53 at the lower end of the pneumatic slider 48 is extruded. 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 material enters the mixing cavity 41 through the liquid inlet pipeline 49, the misaligned flow guide hole 52 and the liquid feeding pipeline 43, and then enters the uniform distribution cavity 44 through the injection mounting cylinder 45 and the injection mounting hole 42. With the increase of the mixed raw material, the mixed raw material is uniformly introduced into the distribution conduit 54 and the partition injection conduit 56, and then, when the pressure exceeds the preset pressure of the one-way overflow valve 57, the mixed raw material is sprayed into the space of the clamped mold. With the mixed raw material in the clamped mold space contacting with air to foam, the foam state is controlled within the displacement limitation range of the synchronous adjusting limiting ring 11. During the displacement process, the air-tight guide ring 37 gradually moves away from the air-tight guide groove 38, the spring column 53 extrudes the pneumatic slider 48 to reset, and the further entry of the raw material into the mixing cavity 41 is cut off. At the same time, with the filling of the foam body into the cavity, the pressure in the clamped mold space is increased, and the entry of the mixed raw material is terminated when the pressure overcomes the injection power. After the upper mold backflow heat dissipation module operates synchronously and keeps for a period of time, the top mounting disc 5 and the injection upper mold 20 thereon are lifted, the injection part is taken out, and the production of the micro-foamed automobile accessory is completed.

[0060] The several inclined flow grooves 18 arranged at equal angles outside the partition injection conduit 56 can uniformly guide the mixed raw material, improve the flatness of the initial state mixed raw material, and improve the yield of the injection part.

[0061] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0062] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and application of the present application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the present application, which is defined by the following 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 1 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.

Images