WO2020258679A1 - Forming mold for thin-wall multi-cavity plastic part - Google Patents

Abstract

Provided is a forming mold for a thin-wall multi-cavity plastic part, the forming mold comprising a fixed mold (12), a movable mold (11), a guide mechanism and a pouring system. A mold core is of an integrated structure and is provided with a plurality of sub-mold cores (110), a plurality of sub-mold cavities (120) are provided in a mold cavity, and the corresponding sub-mold cores (110) match the sub-mold cavities (120) to form a plurality of sub-cavities for forming plastic part cavities; at least one side blowing hole (111) is provided in an outer side part of each of the sub-mold cores (110), a pin plug (20) is detachably mounted in the side blowing hole (111), and a blowing clearance is formed by a mounting clearance between the pin plug (20) and the side blowing hole (111); and a through positioning hole (21) is formed in the pin plug (20), a pin hole (114) and an ejector pin hole (115) are provided at positions, located in an upper side and a lower side of the side blowing hole (111) respectively, inside the sub-mold core (110), the pin hole (114) extends upwards to penetrate an upper end face of the sub-mold core (110), the ejector pin hole (115) extends downwards to penetrate a lower end face of the movable mold (11), and the positioning hole (21), the pin hole (114) and the ejector pin hole (115) are arranged coaxially. The forming mold for the thin-wall multi-cavity plastic part is stable in terms of structure, convenient to machine and has a high matching precision, and the problems of the thin-wall multi-cavity plastic part being difficult to demold and the fact that the quality cannot be guaranteed can be effectively solved.

Description

Thin-walled multi-cavity plastic part forming mould Technical field

The invention belongs to the technical field of injection molds, and particularly relates to a thin-walled multi-cavity plastic part forming mold.

Background technique

Injection mold is a tool for producing plastic products. It is used to give plastic products a complete structure and precise dimensions. Thin-walled products are easy to cover on the mold core after molding, and it is difficult to demold. The ejector ejection mechanism is adopted. The wall of the part is thin and easily damaged. Therefore, the thin-walled plastic parts are mostly used for air blow demolding. However, the structure of the thin-walled multi-cavity plastic parts is complicated, and the fixed film moving film is required to form multiple cavities to form the plastic parts. Different cavities, the structure of the mold core is complex, and the opening space of the air flow channel is limited. It is difficult for the compressed gas to reach the cavities of the plastic part uniformly, resulting in poor demolding effect, and to facilitate the opening of air flow channels and cooling water channels. To reduce the difficulty of mold processing and manufacturing cost, mold cores are mostly split structure. Since thin-walled plastic parts require higher injection pressure and molding accuracy than ordinary plastic parts, the strength and accuracy of the molding mold are required to be higher to ensure the product However, the split structure of the mold core will reduce the structural strength, molding accuracy and surface finish of the mold, resulting in short mold life, mold cracking and water leakage, low matching accuracy, unguaranteed quality of plastic parts, and high defect rate.

Summary of the invention

Aiming at the problems of poor structural stability of the existing thin-wall multi-cavity plastic injection mold, low matching accuracy, difficult product demolding, and inability to guarantee product quality, the present invention provides a thin-wall multi-cavity plastic injection mold.

The purpose of the present invention can be achieved through the following technical solutions:

A thin-walled multi-cavity plastic part forming mold, comprising a fixed mold, a movable mold, a guide mechanism and a pouring system, characterized in that a cavity is formed in the middle of the fixed mold, and a mold core is formed in the middle of the movable mold. The mold core is One-piece structure, combined with the structure of the thin-walled multi-cavity plastic part to form multiple sub-mold cores, the cavity and the structure of the thin-walled multi-cavity plastic part form multiple sub-mold cavities, and the corresponding sub-mold cores are matched with the sub-mold A plurality of sub-cavities forming each cavity of the molded plastic part; each of the sub-mold cores is provided with at least one side blow hole on the outer side, and a pin plug is detachably installed in the side blow hole. The pin plug and the side blow hole The installation gap between the two sides forms a blowing gap, and the side blowing holes are respectively connected with the corresponding air flow channels, and the air flow channels are formed at intervals in the sub-mold core; the pin plug is provided with a through positioning hole, and the axial direction of the positioning hole is aligned with the sub-mold The height direction of the core is the same. The sub-mold core is provided with pin holes and thimble holes on the upper and lower sides of the side blow holes. The pin holes extend upward through the upper end surface of the sub-mold core, and the thimble holes extend downward through the movable mold On the lower end surface, the positioning hole, the pin hole, and the thimble hole are arranged coaxially, and the positioning pin is installed in the pin hole and extends downward to the positioning hole to fix the pin plug.

Preferably, the top of each sub-mold core is provided with an air cap hole, an air jet valve is installed in the air cap hole, and the air cap hole is respectively communicated with a corresponding air flow channel.

The integral structure of the mold core structure has high strength and stability, can prolong the service life of the mold, and has a smooth surface, high precision in matching with the mold cavity, and can improve the product quality of thin-walled multi-cavity plastic parts and avoid excessive production. Injection impression; each sub-mold core is provided with air top holes and side blowing holes. The compressed gas can blow to the top and side walls of the different cavities of the thin-walled multi-cavity plastic part to make the thin-walled multi-cavity plastic A uniform air layer is formed between the part and the mold core to facilitate the demolding of the plastic part, and the pressure of the compressed gas can be adjusted according to the shape and wall thickness of the thin-walled multi-cavity plastic part to ensure the demolding effect while ensuring the product quality; The arrangement of pin holes and thimble holes can effectively solve the problems of fixing, dismounting and replacing pin plugs without destroying the integrity of the mold core. The air output of the side blowing holes can be adjusted by replacing pin plugs of different sizes.

Preferably, the movable mold is formed with a concave guide cone groove, the mold core is recessed in the guide cone groove, the fixed mold is formed with a convex guide cone, the mold cavity is recessed in the guide cone, and the guide cone The inner conical surface of the groove cooperates with the outer conical surface of the guiding frustum to guide and position the clamping and opening of the movable mold and the fixed mold. The guide cone groove and the guide cone table cooperate with other guide mechanisms to further improve the matching accuracy of the mold cavity and the mold core, thereby ensuring product quality.

Preferably, the outer cone surface of the guide frustum is evenly provided with a plurality of installation grooves along the circumferential direction, the installation grooves are equipped with a wear block, the wear block is installed obliquely, and its inclination angle is the same as that of the outer cone surface. The draft angle is the same. The setting of the wear-resistant block can reduce the wear of the mating surface of the movable mold and the fixed mold and prolong the service life of the mold.

Preferably, the shape of the wear-resistant block is matched with the installation groove, and is installed in the installation groove by bolts, the outer surface of the wear-resistant block protrudes from the outer conical surface, and the wear-resistant block can be installed between the groove bottom and the installation groove. Adjusting shims are installed to adjust the matching accuracy of the movable mold and the fixed mold. After the fixed mold and the movable mold are worn out, the mating degree of the movable mold and the fixed mold can be adjusted by the gasket to prevent the molten material from overflowing and causing flash.

Preferably, the movable mold is fixed on the movable mold seat plate, and parallel pads are installed on the bottom surface of the movable mold seat plate, and the strength of the parallel pads is higher than that of the movable mold seat plate. Since thin-walled multi-cavity plastic parts are thin-walled injection products, in order to ensure product quality, very large injection pressure and clamping force are required. The movable mold seat plate will be concave under the action of injection pressure and clamping force, which affects the dynamic The matching of the fixed mold and the mold is easy to produce flash. By setting the parallel pads, the movable mold seat plate can be compensated to improve its strength. The adjustment pads can be installed by the pad to adjust the matching accuracy of the movable mold and the fixed mold to ensure product quality .

Preferably, the side blowing hole is a gradually expanding hole, the diameter of which gradually increases from the inlet end to the outlet end. The side blowing hole is set as a gradual reaming hole, which facilitates the installation and disassembly of the pin plug and ensures smooth air outlet.

Preferably, the pin plug has a cylindrical structure with a first end surface, a second end surface and an annular side wall, wherein the annular side wall is adapted to the inner wall of the side blow hole, and the first end surface is located at the air outlet end of the side blow hole , And matched with the side molding surface of the sub-mold core to form an auxiliary molding surface. To improve the integrity of the side molding surface, so as to ensure the appearance quality of the injection molded product.

Preferably, the second end surface is located at the air inlet end of the side blowing hole, and the outer edge of the second end surface is formed with a circular arc chamfer. The arc-shaped chamfer can effectively avoid stress concentration and ensure the smooth flow of compressed gas.

Preferably, an annular groove is provided on the annular side wall of the pin plug along the circumferential direction, and the annular groove is arranged close to the first end surface. The setting of the annular groove can avoid the poor air outflow caused by the thermal expansion of the mold core and the pin plug.

Preferably, an air guiding groove is formed on the annular side wall of the pin plug along the length direction of the pin plug, and the air guiding groove extends from the outer edge of the second end surface into the annular groove. The setting of the air guide groove can ensure the smooth air outlet from the side blowing hole, and prevent the mold core and pin plug from being locked after thermal expansion, hindering the flow of compressed gas; and the air guide groove is connected with the annular groove, which can redistribute the compressed gas in the annular groove , Blowing evenly along the outer peripheral surface of the pin plug towards the injection molded product, the demolding effect is better, and the phenomenon of whitening and cracking due to excessive pressure is avoided, and the quality of the plastic part is guaranteed.

Preferably, a plurality of vertical cooling water channels are formed at intervals within each of the sub-mold cores, and the axial direction of the vertical cooling water channels is consistent with the axial direction of the air flow channel, and they are all opened along the height direction of the mold core. A horizontal cooling water channel is opened on the lower end surface, and the vertical cooling water channel extends downward and communicates with the horizontal cooling water channel. The vertical cooling water channel is consistent with the axial direction of the air flow channel, which can increase the cooling stroke of the cooling water, and the vertical cooling water channel can avoid the air flow channel, so that there is enough space inside the sub-mold core to ensure the number of cooling water channels. Its cooling effect improves the quality of injection molded products. The horizontal cooling water channel opened on the lower end of the movable mold can further improve the cooling effect, and can connect multiple vertical cooling water channels into a continuous water channel, improving cooling efficiency.

Preferably, a safe distance is set between the vertical cooling water passages and between the vertical cooling water passage and the air flow channel, and the safe distance is greater than 6 mm. Since the cooling water channel needs to be cleaned with strong acid regularly, a safety distance of 6mm or more can effectively avoid the cooling channel perforation and ensure the structural strength of the mold core.

Compared with the prior art, the present invention has the following beneficial effects. The mold core is an integrated structure, which has high structural stability, can prolong the service life of the mold, and has high matching accuracy with the mold cavity, thereby ensuring thin-walled multi-cavity plastics The product quality of the parts; each sub-mold core is provided with an air top hole and a side blowing hole. The compressed gas can blow the top and side walls of the different cavities of the thin-walled multi-cavity plastic part to make the plastic part and the core A uniform air layer is formed between them to facilitate the demolding of the plastic parts, and the pressure of the compressed gas can be adjusted according to the shape and wall thickness of the thin-walled multi-cavity plastic parts, while ensuring the demolding effect and product quality; pin holes and thimble holes The setting can effectively solve the problem of pin plug installation, fixing, disassembly and replacement without damaging the integrity of the mold core; the distribution of air flow channels and cooling water channels is reasonable and effective, which can ensure the strength of the sub-mold core while ensuring the demolding effect and Cooling effect; the setting of wear-resistant blocks and parallel pads can effectively extend the service life of the mold, and can adjust the matching accuracy of the movable mold and the fixed mold to ensure the quality of thin-walled multi-cavity plastic parts.

Description of the drawings

Figure 1 is a schematic diagram of the internal structure of the present invention;

Figure 2 is a schematic diagram of the structure of the movable mold in the present invention;

Figure 3 is a schematic diagram of the internal structure of the movable mold in the present invention;

Figure 4 is a schematic diagram of the pin plug structure of the present invention;

Figure 5 is a schematic diagram of another structure of the pin plug in the present invention;

Figure 6 is a schematic diagram of the bottom structure of the movable mold in the present invention;

Figure 7 is a schematic diagram of the fixed mold structure of the present invention;

Figure 8 is a schematic diagram of the bottom wall structure of the movable mold seat plate in the present invention;

Figure 9 is a schematic diagram of the structure of a multi-cavity lunch box;

In the figure, the movable mold 11; the fixed mold 12; the hot runner plate 13; the movable mold seat plate 14; the sub-mold core 110; the side blow hole 111; the air top hole 112; the air flow channel 113; the pin hole 114; the thimble hole 115; Vertical cooling channel 116; horizontal cooling channel 117; guiding cone groove 118; pin plug 20; positioning hole 21; first end surface 22; second end surface 23; annular groove 24; air guide groove 25; sub-mold cavity 120; guide Frustum 121; Wear block 122; Parallel cushion block 30; Multi-cavity lunch box 40.

Detailed ways

The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

1-9, this embodiment discloses a thin-walled multi-cavity plastic molding mold, which includes a fixed mold 12, a movable mold 11, a guiding mechanism, and a pouring system. A mold core is formed in the middle of the movable mold 11. The middle part of the fixed mold 12 is formed with a mold cavity, the mold core is an integral structure, and the structure of the thin-walled multi-cavity plastic part has a plurality of sub-mold cores 110, and the mold cavity is matched with the thin-walled multi-cavity plastic part. Multiple sub-mold cavities 120, corresponding sub-mold core 110 and sub-mold 120 cooperate to form multiple sub-cavities of each cavity of the molded plastic part. The integrated structure of the mold core has high strength and stability, which can prolong the service life of the mold , And the surface is smooth, and the matching accuracy with the mold cavity is high, which can improve the product quality of thin-walled multi-cavity plastic parts and avoid excessive injection marks; the thin-walled multi-cavity plastic parts in this embodiment are multi-cavity The lunch box 40 has four cavities. See Figure 9 for its structure. The sub-mold core 110 and the sub-mold 120 are matched with the multi-cavity lunch box 40. Each has four structures and cooperates to form four cavities; the casting system is set in The hot runner plate 13 includes a main runner and a runner. The runner communicates with the injection molding machine to send the melt to each runner. In this embodiment, there are four runners communicating with four sub-cavities for glue injection; The mechanism includes a guide sleeve installed on the fixed mold 12 and a guide post installed on the movable mold 11. The guide sleeve and the guide post cooperate to guide the opening and closing of the fixed mold 12 and the movable mold 11 to ensure the mold cavity and core Matching accuracy.

For plastic parts with a top wall, each sub-mold core 110 is provided with an air cap hole 112 at the top, and an air jet valve is installed in the air cap hole 112. The model of the air jet valve in this embodiment is C-AJVSS6- 12. Its outer diameter is 6mm and it is made of stainless steel, including the body, piston rod, spring, and elastic split pin. The gas top hole 112 is respectively connected with the corresponding air flow channel 113; in order to further improve the demolding effect, each sub-mold core The outer part of 110 is also provided with a side blow hole 111, the side blow hole 111 is detachably installed with a pin plug 20, the installation gap between the pin plug 20 and the side blow hole 111 forms a blow gap, the air top hole 112 and The side blowing holes 111 are respectively communicated with the corresponding airflow channels 113. The airflow channels 113 are formed inside the sub-mold core 110 at intervals, and their axial directions are consistent with the height direction of the sub-mold core 110. In this embodiment, the height direction of the sub-mold core 110 Refers to the moving direction of the sub-mold core 110 when the mold is closed. Since the multi-cavity lunch box 40 is easily covered in the sub-mold core 110 after being molded, each sub-mold core 110 is provided with an air top hole 112 and a side blow hole 111, The compressed air can blow air to the top and side walls of the different cavities of the multi-cavity lunch box 40, so that a uniform air layer is formed between the multi-cavity lunch box 40 and the mold core, which facilitates the demolding of the multi-cavity lunch box 40 and can According to the shape and wall thickness of the multi-cavity lunch box 40, the pressure of the compressed gas is adjusted to ensure the demolding effect while ensuring product quality.

The pin plug 20 is provided with a through positioning hole 21. The axial direction of the positioning hole 21 is consistent with the height direction of the sub-mold core 110. The sub-sub-mold core 110 is provided with pin holes 114 and 114 on the upper and lower sides of the side blowing holes 111, respectively. The thimble hole 115, the pin hole 114 extends upward through the upper end surface of the sub-mold core 110, and the thimble hole 115 extends downward through the lower end surface of the movable mold 11. The positioning hole 21, the pin hole 114, and the thimble hole 115 are the same The pin hole 114 is a stepped hole. The positioning pin is installed in the pin hole 114 and extends downward to the positioning hole 21 to fix the pin plug 20. The pin hole 114 and the thimble hole 115 can be set without destroying the Under the premise of the integrity of the core 110, the problem of installation, fixing, disassembly and replacement of the pin plug 20 can be effectively solved. The positioning pin installed in the pin hole 114 can fix the pin plug 20 to prevent it from loosening and falling off under the action of compressed gas. When disassembling and replacing the pin plug 20, first remove the positioning pin, then extend the thimble from the lower end of the thimble hole 115, use the thimble to pull the pin plug 20 out, and adjust the side blowing hole 111 by replacing the pin plug 20 of a different size. Blow volume.

The side blowing hole 111 is a gradually expanding hole whose diameter gradually increases from the inlet end to the outlet end. The side blowing hole 111 is set as a gradually expanding hole to facilitate the installation and disassembly of the pin plug 20 and is formed on the side close to the outlet end. There is a retaining edge to facilitate the installation of the pin plug 20 and improve the accuracy of assembly; the pin plug 20 has a cylindrical structure, and its outer contour is adapted to the inner wall of the side blowing hole 111. The pin plug 20 has a first end surface 22 and a second end surface 22. The end surface 23. The first end surface 22 is located at the air outlet end of the side blow hole 111 and matches the side molding surface of the sub-mold core 110 to form an auxiliary molding surface to improve the integrity and smoothness of the side molding surface, thereby ensuring injection molding The appearance quality of the product; the second end surface 23 is located at the inlet end of the side blowing hole 111, and the outer edge of the second end surface 23 is formed with an arc-shaped chamfer. The arc-shaped chamfer can effectively avoid stress concentration and improve the pin plug The installation stability of 20 is stable, and the compressed gas is smoothly discharged; the annular side wall of the pin plug 20 is provided with an annular groove 24 along the circumferential direction, and the annular groove 24 is arranged close to the first end surface 22. Further, the pin plug 20 An air guide groove 25 is also provided on the annular side wall along the axial direction of the pin plug 20. There are two air guide grooves 25 and are opened symmetrically. The air guide groove 25 extends from the outer edge of the second end surface 23 to the annular recess In the groove 24, the arrangement of the annular groove 24 and the air guide groove 25 can ensure that the side blowing hole 111 is smoothly discharged, avoid the mold core and the pin plug 20 from being locked after being heated and expanded, and hinder the flow of compressed gas, and the air guide groove 25 and the annular recess The groove 24 is connected to enable the compressed gas to be redistributed in the annular groove 24, and evenly blows toward the injection molded product along the outer peripheral surface of the pin plug 20, which has a better demolding effect and prevents excessive compressed gas pressure from damaging the injection molded product and causing perforation And top white; in this embodiment, the pin plug 20 and the pin are made of the same material as the sub-mold core 110 to ensure that they have a consistent coefficient of thermal expansion and contraction and improve the fit between the pin plug 20 and the sub-mold core 110.

The movable mold 11 is formed with a concave guide cone groove 118, the core is sunken in the guide cone groove 118, and the fixed mold 12 is formed with a convex guide cone 121, the cavity is sunken in the guide cone 121, and the guide cone The inner cone surface of the groove 118 cooperates with the outer cone surface of the guide frustum 121 to position and guide the clamping and opening of the movable mold 11 and the fixed mold 12, thereby further improving the matching accuracy of the mold cavity and the mold core, and is advantageous for injection molding The pressure is maintained when the parts are formed to ensure product quality; the parting surface on the movable mold 11 is also provided with an annular exhaust groove for exhaust during injection molding; the outer cone of the guide frustum 121 is evenly provided in the circumferential direction Four installation grooves. Wear blocks 122 are installed in the installation grooves. The wear blocks 122 are installed obliquely, and the inclination angle is consistent with the draft angle of the outer cone. The outer surface of the wear blocks 122 protrudes from the outside Since the movable mold 11 and the fixed mold 12 need to be opened and closed reciprocally, the matching surface is very easy to wear, which affects the matching accuracy of the mold. The setting of the wear block 122 can reduce the wear of the movable mold 11 and the fixed mold 12 and extend the mold. Service life; the shape of the wear block 122 matches the installation groove, and is installed in the installation groove by bolts, and an adjustment pad can be installed between the wear block 122 and the bottom of the installation groove to adjust the movable mold 11 With the accuracy of the matching with the fixed mold 12, after the fixed mold 12 and the movable mold 11 are worn out, the mating degree of the movable mold 11 and the fixed mold 12 can be adjusted by pads to prevent the molten material from overflowing and flashing; the movable mold 11 is fixed on On the movable mold seat plate 14, a parallel pad 30 is installed on the bottom surface of the movable mold seat plate 14. The parallel pad 30 is located in the center of the bottom surface of the movable mold seat plate 14, because the thin-walled multi-cavity plastic part is in the molding process , In order to ensure product quality, very large injection pressure and clamping force are required. The movable mold seat plate 14 will be concave under the repeated action of injection pressure and clamping force, which affects the cooperation of the movable mold 11 and the fixed mold 12. When flash occurs, the movable mold seat plate 14 can be compensated by setting the parallel spacer block 30 to improve its strength, and the matching accuracy of the movable mold 11 and the fixed mold 12 can be adjusted by the cushioning adjustment spacer to ensure product quality.

Each of the sub-mold cores 110 is formed with a plurality of vertical cooling water channels 116 at intervals. The axial direction of the vertical cooling water channels 116 is consistent with the axial direction of the air flow channel 113, and they are all opened along the height direction of the mold core. The lower end surface of 11 is provided with a horizontal cooling water channel 117. The vertical cooling water channel 116 extends downward and communicates with the horizontal cooling water channel 117. Each vertical cooling water channel 116 is provided with a water barrier along its axial direction. The water fins separate the cooling water channel into water inlet and outlet channels. The vertical cooling water channel 116 and the air flow channel 113 have the same axial direction, which can increase the cooling stroke of the cooling water, and the vertical cooling water channel 116 can avoid the air flow channel 113, so that There is enough space inside the sub-mold core 110 to ensure the number of cooling water channels, ensure its cooling effect, and improve the quality of injection molded products. The horizontal cooling water channels 117 opened on the lower end surface of the movable mold 11 can further improve the cooling effect and make more Two vertical cooling water channels 116 are connected to become a continuous water channel, which improves cooling efficiency and facilitates communication with external water supply devices; due to the high injection pressure of thin-walled multi-cavity plastic parts, the upper end surface of the sub-mold core 110 is the main pressure-bearing part. Therefore, while increasing the depth of the cooling water channel to improve its cooling effect, it is necessary to take into account the structural strength of the sub-mold core 110. Therefore, the reserved distance between the upper end surface of the vertical cooling water channel 116 and the upper end surface of the sub-mold core 110 should be greater than 9 mm. In this embodiment, the above-mentioned reserved spacing is 11mm; since the vertical cooling water channel 116 needs to be cleaned with strong acid regularly, in order to avoid perforation, safety is set between the vertical cooling water channel 116 and between the vertical cooling water channel 116 and the air flow channel 113 The safety distance is greater than 6mm. The setting of the reserved distance and the safety distance not only ensures the cooling effect of the cooling water channel, but also ensures the structural strength of the mold core, thereby effectively solving the problems of water leakage in the cooling water channel and cracking of the movable mold 11. Tool life.

The thin-walled multi-cavity plastic molding mold disclosed in the present invention has compact structure and convenient processing. The mold core adopts an integrated structure, has high structural strength and stability, and has a long service life. The mold core and mold cavity are under the action of multiple guiding and positioning mechanisms. , The matching accuracy is high, thus ensuring the product quality of thin-walled multi-cavity plastic parts; the setting of the wear block 122 and the parallel pad 30 can effectively extend the service life of the mold, and can adjust the matching accuracy of the movable mold 11 and the fixed mold 12 , To further ensure the quality of thin-walled multi-cavity plastic parts; each sub-mold core 110 is provided with air cap holes 112 and side blow holes 111, which can form a uniform air layer between each cavity of the plastic part and the sub-mold core , To facilitate the demolding of plastic parts; the distribution of the air flow channel 113 and the cooling water channel is reasonable and effective, which can ensure the demolding effect and cooling effect while ensuring the structural strength of the sub-mold core 110.

It should be understood that in the claims and specification of the present invention, all "including..." should be understood as open-ended meaning, that is, its meaning is equivalent to "at least including...", and should not be understood as closed-ended Meaning, that is, its meaning should not be understood as "only containing...".

The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to this, changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the present invention , Should be covered within the scope of protection of the invention.

Claims (10)

A thin-walled multi-cavity plastic part forming mold, comprising a fixed mold (12), a movable mold (11), a guiding mechanism and a pouring system, characterized in that a cavity is formed in the middle of the fixed mold (12), and the movable mold ( 11) A mold core is formed in the middle of the mold core. The mold core is an integrated structure and forms multiple sub-mold cores (110) with the structure of the thin-walled multi-cavity plastic part. A plurality of sub-mold cavities (120), the corresponding sub-mold core (110) and the sub-mold cavity (120) cooperate to form multiple sub-cavities of each cavity of the molded plastic part; the outer part of each sub-mold core (110) At least one side blow hole (111) is provided, a pin plug (20) is detachably installed in the side blow hole (111), and the installation gap between the pin plug (20) and the side blow hole (111) forms a blowing gap , The side blowing holes (111) are respectively communicated with the corresponding air channels (113), and the air channels (113) are formed at intervals inside the sub-mold core (110); the pin plug (20) is provided with a through positioning hole (21) ), the axial direction of the positioning hole (21) is consistent with the height direction of the sub-mold core (110). The sub-mold core (110) is provided with pin holes (114) and top on the upper and lower sides of the side blowing holes (111). The pin hole (115), the pin hole (114) extends upward through the upper end surface of the sub-mold core (110), the thimble hole (115) extends downward through the lower end surface of the movable mold (11), the positioning hole (21) The pin hole (114) and the thimble hole (115) are coaxially arranged, and the positioning pin is installed in the pin hole (114) and extends downward to the positioning hole (21) to fix the pin plug (20). The thin-walled multi-cavity plastic molding mold according to claim 1, wherein the movable mold (11) is formed with a concave guide cone groove (118), and the mold core is recessed in the guide cone groove In (118), the fixed mold (12) is formed with a convex guide frustum (121), the cavity is sunken in the guide frustum (121), the inner cone surface of the guide cone groove (118) and the guide cone The outer cone surface of the table (121) cooperates to guide and position the clamping and opening of the movable mold (11) and the fixed mold (12). The thin-walled multi-cavity plastic molding mold according to claim 2, wherein the outer cone of the guide frustum (121) is evenly provided with a plurality of installation grooves along the circumferential direction, and the installation grooves A wear-resistant block (122) is installed in the center, and the wear-resistant block (122) is installed obliquely, and its inclination angle is consistent with the draft angle of the outer cone surface. The thin-walled multi-cavity plastic molding mold according to claim 3, wherein the shape of the wear-resistant block (122) is matched with the installation groove, and is installed in the installation groove by bolts. The outer surface of (122) protrudes from the outer conical surface, and an adjustment gasket can be installed between the wear block (122) and the bottom of the installation groove to adjust the coordination of the movable mold (11) and the fixed mold (12) Accuracy. The thin-walled multi-cavity plastic molding mold according to claim 1, wherein the movable mold (11) is fixed on the movable mold seat plate (14), and the movable mold seat plate (14) Parallel pads (30) are installed on the bottom surface of the parallel pads, and the strength of the parallel pads (30) is higher than that of the movable mold seat plate (14). The thin-walled multi-cavity plastic molding mold according to any one of claims 1-5, wherein the pin plug (20) is a cylindrical structure with a first end surface (22), a second The end surface (23) and the annular side wall, wherein the annular side wall is adapted to the inner wall of the side blow hole (111), and the first end surface (22) is located at the air outlet end of the side blow hole (111) and is connected to the sub-mold core ( The side molding surface of 110) matches to form an auxiliary molding surface. The thin-walled multi-cavity plastic molding mold according to claim 6, wherein the second end surface (23) is located at the air inlet end of the side blow hole (111), and the second end surface (23) The outer edge is formed with a circular arc chamfer. The thin-walled multi-cavity plastic molding mold according to claim 6, wherein the annular side wall of the pin plug (20) is provided with an annular groove (24) along the circumferential direction. The groove (24) is arranged close to the first end surface (22). The thin-walled multi-cavity plastic molding mold according to claim 8, wherein the annular side wall of the pin plug (20) is provided with an air guide groove (20) along the length direction of the pin plug (20). 25), the air guide groove (25) extends from the outer edge of the second end surface (23) into the annular groove (24). The thin-walled multi-cavity plastic molding mold according to any one of claims 1-5, wherein each sub-mold core (110) is formed with a plurality of vertical cooling channels (116) at intervals. ), the axial direction of the vertical cooling water channel (116) is consistent with the axial direction of the air flow channel (113), and both are opened along the height direction of the mold core, and the lower end surface of the movable mold (11) is provided with a horizontal cooling channel (117 ), the vertical cooling water channel (116) extends downward and communicates with the horizontal cooling water channel (117); between the vertical cooling water channels (116) and between the vertical cooling water channel (116) and the air flow channel (113) A safety distance is set between them, and the safety distance is greater than 6mm.

Images