A mold and process for producing an automotive interior injection molded part

Abstract

The present application relates to a kind of mould and process for producing automotive interior injection molding parts, which comprises: fixed die assembly, movable die assembly, ejection assembly, driving mechanism and enclosing mechanism;The driving mechanism is used to drive movable die assembly and fixed die assembly switch between open state, first closed state and second closed state;Movable die assembly and fixed die assembly in first closed state, will form forming cavity and several vacuum channels communicated with the periphery of forming cavity;Movable die assembly and fixed die assembly in second closed state, the vacuum channel will be closed;The enclosing mechanism is used to fill the gap between movable die assembly and fixed die assembly when movable die assembly and fixed die assembly are in first closed state.This application can form vacuum channel communicated with forming cavity on the periphery of forming cavity when the mould is in first closed state, to carry out vacuumizing on the periphery of forming cavity, to reduce the air pressure in forming cavity, so that molten raw material is more easily flowed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding, in particular to a mold and process for producing an automotive interior injection molded part. BACKGROUND

[0002] The automotive interior refers to all parts and systems inside the vehicle that come into contact with people, which can directly affect the driving experience, safety and comfort. The automotive interior is an important part of the car, and the automotive interior mainly includes: instrument panel, auxiliary instrument panel, door inner guard, ceiling, seat, pillar guard and cab interior trim parts, etc.

[0003] The automotive interior injection molded part has the characteristics of large area and thin size, and the automotive interior injection molded part generally adopts a high-speed thin-wall injection molding process. The high-speed thin-wall injection molding process has the characteristics of fast injection speed, high injection pressure, high melt temperature, etc. However, during the high-speed thin-wall injection molding process, due to the too fast melt flow rate, the melt front is easy to wrap the gas in the molding cavity, forming bubbles or causing the product surface to form burn marks, thereby affecting the yield of the product. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a mold and process for producing an automotive interior injection molded part.

[0005] To solve the above technical problems, the present application adopts the following technical solutions:

[0006] A mold for producing an automotive interior injection molded part, comprising: a fixed mold assembly, a movable mold assembly, an ejection assembly, a driving mechanism and an enclosing mechanism;

[0007] The driving mechanism is used to drive the movable mold assembly and the fixed mold assembly to switch between an open state, a first closed state and a second closed state;

[0008] The movable mold assembly and the fixed mold assembly form a molding cavity and a plurality of vacuum channels communicating with the peripheral side of the molding cavity when in the first closed state;

[0009] The movable mold assembly and the fixed mold assembly are in the second closed state, and the vacuum channels are closed;

[0010] The driving mechanism is used to drive the ejection assembly to extend when the movable mold assembly and the fixed mold assembly are in the open state;

[0011] The enclosing mechanism is used to fill the gap between the movable mold assembly and the fixed mold assembly when the movable mold assembly and the fixed mold assembly are in the first closed state.

[0012] Further, the fixed mold assembly comprises a fixed mold plate, a fixed mold seat and a shaping core, the fixed mold seat is arranged on the fixed mold plate, and the shaping core is arranged on the fixed mold seat;

[0013] The movable die assembly comprises a movable die plate, a movable die base, a movable core and a plurality of side sliding cores, the movable die base is arranged on the movable die plate, the movable core is arranged on the movable die base, and the side sliding cores are slidingly arranged on the movable die base, and all the side sliding cores are distributed on the periphery of the movable core;

[0014] In the first closed state of the movable die assembly and the fixed die assembly, there is a gap between the side sliding cores and the movable core, and the gap is communicated with the vacuum channel.

[0015] Further, a plurality of first sliding grooves are arranged on the movable die base, a first sliding block is arranged in each first sliding groove, an inclined top pillar is arranged on the first sliding block, and an inclined hole matched with the inclined top pillar is arranged on the side sliding core;

[0016] A plurality of air grooves are arranged on the movable die base, one end of each air groove is communicated with the gap, the other end of each air groove is communicated with the upper part of the first sliding groove, and a first through hole is arranged on the outer side of the first sliding block and communicated with the upper part of the first sliding groove;

[0017] In the first closed state of the movable die assembly and the fixed die assembly, the air grooves, the upper parts of the first sliding grooves and the first through holes form the vacuum channel.

[0018] Further, a plurality of first sliding grooves are arranged on the movable die base, a first sliding block is arranged in each first sliding groove, an inclined top pillar is arranged on the first sliding block, and an inclined hole matched with the inclined top pillar is arranged on the side sliding core;

[0019] A plurality of air holes and air extraction holes are arranged on the movable die base, one end of each air hole is communicated with the gap, the middle part of each air hole is communicated with the air extraction hole, and a filling rod is slidingly arranged in each air hole;

[0020] In the first closed state of the movable die assembly and the fixed die assembly, the driving mechanism is used to drive the filling rod to move away from the gap, so as to form the vacuum channel with the air holes and the air extraction holes.

[0021] Further, the enclosing mechanism comprises a first enclosing assembly and a second enclosing assembly, the first enclosing assembly comprises a sealing ring, the sealing ring is arranged on the core, and the sealing ring is arranged on the outer side of the molding cavity, and the first enclosing assembly is used to make the sealing ring abut against all the side sliding cores when the movable die assembly and the fixed die assembly are in the first closed state;

[0022] The second enclosing assembly comprises a sealing column, a sealing column is arranged between every two adjacent side sliding cores, the sealing column is arranged on the movable die base, and the driving mechanism is used to drive the sealing column to extend out to fill the space between the adjacent side sliding cores and the sealing ring when the movable die assembly and the fixed die assembly are in the first closed state.

[0023] Further, the sizing core is provided with an annular groove, and the closed ring is slidably arranged in the annular groove.

[0024] Further, the closed ring comprises a plurality of arc-shaped blocks, and all the arc-shaped blocks can be spliced into a complete closed ring.

[0025] Further, the movable die seat is provided with a plurality of second sliding grooves, and the closed column is slidably arranged in the second sliding grooves, and the end of the closed column away from the sizing core is connected with the driving mechanism.

[0026] Further, the second enclosing assembly further comprises a base connected with the driving mechanism, and the base is provided with a plurality of third sliding grooves, and the end of the closed column away from the sizing core is provided with a second sliding block slidably arranged in the third sliding grooves, and the third sliding grooves are provided with a second elastic member for providing elastic force for moving the closed column to the sizing core.

[0027] A process for producing an automobile interior injection molding part, comprising the following steps:

[0028] The injection material is input into the injection molding machine, and the injection material is hot melted by the injection molding machine;

[0029] The mold is closed to a first closed state to form a molding cavity and a plurality of vacuum channels connected with the periphery of the molding cavity, the vacuum channels and the molding cavity are vacuumized by the vacuumizing mechanism, and the injection molding machine injects hot melt material into the molding cavity;

[0030] After the injection molding is performed for a predetermined time, the mold is closed to a second closed state to close the vacuum channels on the periphery of the molding cavity, and the hot melt material is continuously injected into the molding cavity until the hot melt material fills the entire molding cavity;

[0031] After the mold is pressure-kept and cooled and shaped, the mold is opened to an open state, and the product is pushed out by the ejection assembly;

[0032] The product is subjected to heat treatment.

[0033] Compared with the prior art, the above technical scheme has the following advantages:

[0034] The present application can form a vacuum passage communicated with the forming cavity on the periphery of the forming cavity when the mold is in the first closed state, and the air pressure in the forming cavity is reduced by vacuumizing on the periphery of the forming cavity, so that the molten raw material is more easily flowed, the internal stress concentration phenomenon is reduced, and the melt front in the forming cavity is prevented from wrapping air, thereby reducing the generation of bubbles, weld marks and flow marks, greatly improving the surface quality of the product, and facilitating more uniform internal stress of the product.

[0035] The present application will be described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The overall structure of the mold in the embodiment of the present application is shown in the figure.

[0037] Figure 2 The cross-sectional structure of the mold in the second closed state in the embodiment of the present application is shown in the figure.

[0038] Figure 3 The enlarged view of A in the figure. Figure 2

[0039] Figure 4 The partial cross-sectional view of the mold in the first closed state in the embodiment of the present application is shown in the figure.

[0040] Figure 5 The three-dimensional structure of the shaping core and the first enclosing assembly in the embodiment of the present application is shown in the figure.

[0041] Figure 6 The exploded view of the shaping core and the first enclosing assembly in the embodiment of the present application is shown in the figure.

[0042] Figure 7 The structure of the movable mold assembly in the first closed state in the embodiment of the present application is shown in the figure.

[0043] Figure 8 The cross-sectional structure of the movable mold assembly in the embodiment of the present application is shown in the figure.

[0044] Figure 9 The three-dimensional structure of the second enclosing assembly in the embodiment of the present application is shown in the figure.

[0045] Figure 10 The partial cross-sectional structure of the second enclosing assembly in the embodiment of the present application is shown in the figure.

[0046] Figure 11 The structure of the injection molding machine in the embodiment of the present application is shown in the figure.

[0047] Figure 12 The partial cross-sectional view of the mold in the second closed state in another embodiment of the present application is shown in the figure.

[0048] ​Figure 13 For another embodiment of the present application, a partial sectional view of the mold in the first closed state is shown.

[0049] In the drawings, the components represented by each mark are listed as follows:

[0050] a, forming cavity; b, vacuum channel;

[0051] 1, fixed mold assembly; 11, fixed mold plate; 12, fixed mold base; 13, forming core; 131, annular groove; 132, first cavity;

[0052] 2, movable mold assembly; 2a, gap; 2b, gap; 21, movable mold plate; 22, movable mold base; 221, first sliding groove; 221a, upper part; 222, air groove; 223, air hole; 224, air extraction hole; 225, second sliding groove; 226, inclined sliding way; 23, movable forming core; 231, second cavity; 24, side sliding forming core; 241, inclined hole; 25, first sliding block; 251, inclined ejector pin; 252, first through hole; 26, filling rod; 27, bottom plate;

[0053] 3, ejection assembly; 31, ejector plate; 32, ejector pin;

[0054] 4, driving mechanism;

[0055] 5, enclosing mechanism; 51, first enclosing assembly; 511, closed ring; 5111, arc-shaped block; 5112, placing groove; 512, first elastic member; 513, first limiting member; 514, sealing ring; 52, second enclosing assembly; 521, closed column; 5211, second sliding block; 5212, filling part; 5213, guide column; 522, base; 5221, accommodation hole; 523, third sliding groove; 524, second elastic member. DETAILED DESCRIPTION

[0056] The principles and features of the present application are described below in conjunction with the accompanying drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0057] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise" and "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a particular orientation, to be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] Example 1

[0059] As Figure 1 ,Figure 2 , Figure 3 and Figure 4 As shown, a mold for producing automotive interior injection molded parts includes: a fixed mold assembly 1, a moving mold assembly 2, an ejection assembly 3, a drive mechanism 4, and a containment mechanism 5;

[0060] The drive mechanism 4 is used to drive the moving mold assembly 2 and the fixed mold assembly 1 to switch between an open state, a first closed state and a second closed state; the drive mechanism 4 is also used to drive the ejector assembly 3 to extend when the moving mold assembly 2 and the fixed mold assembly 1 are in the open state, so as to push the product out of the molding cavity.

[0061] When the moving mold assembly 2 and the fixed mold assembly 1 are in the first closed state, they will form a molding cavity a and several vacuum channels b that are connected to the periphery of the molding cavity a.

[0062] When the moving mold assembly 2 and the fixed mold assembly 1 are in the second closed state, all vacuum channels b will be closed;

[0063] The enclosure mechanism 5 is used to fill the gap between the moving mold assembly 2 and the fixed mold assembly 1 when the moving mold assembly 2 and the fixed mold assembly 1 are in the first closed state.

[0064] like Figure 2 As shown, the fixed mold assembly 1 is disposed above the moving mold assembly 2. The fixed mold assembly 1 includes a fixed mold plate 11, a fixed mold base 12, and a mold core 13. The fixed mold base 12 is disposed on the fixed mold plate 11, and the mold core 13 is disposed on the fixed mold base 12.

[0065] The moving mold assembly 2 includes a moving template 21, a moving mold base 22, a moving core 23, and a side-sliding core 24. The moving mold base 22 is disposed on the moving template 21, and the moving core 23 is disposed on the moving mold base 22. The moving core 23 is located in the middle of the moving mold base 22. A side-sliding core 24 is disposed in each of the four directions of the moving core 23: front, back, left, and right. The side-sliding core 24 is slidably disposed on the moving mold base 22. The moving template 21 is connected to the driving mechanism 4. The driving mechanism 4 is used to drive the moving template 21 to move closer to or away from the fixed mold assembly 1, so that the fixed mold assembly 1 and the moving mold assembly 2 open or close.

[0066] The fixed core 13 has a first cavity 132 and the moving core 23 has a second cavity 231. When the fixed mold assembly 1 and the moving mold assembly 2 are in the first closed state and the second closed state, the first cavity 132 and the second cavity 231 will combine to form a complete molding cavity a.

[0067] The moving mold base 22 is provided with inclined slides 226 in the front, back, left and right directions of the moving core 23. The side sliding core 24 is provided on the corresponding inclined slide 226 and can slide along the inclined slide 226 to get closer to or away from the moving core 23.

[0068] As Figure 8 shown in FIG. 6, the inclined slide 226 is provided with a vertical first sliding groove 221, and the first sliding groove 221 is slidably provided with a first sliding block 25, and the first sliding block 25 is provided with an inclined top pillar 251, and the side sliding core 24 is provided with an inclined hole 241 matched with the inclined top pillar 251, and all the first sliding blocks 25 are connected with the driving mechanism 4, and the driving mechanism 4 can drive the first sliding block 25 to move along the first sliding groove 221, so as to drive the side sliding core 24 to move along the inclined slide 226 through the inclined top pillar 251 and the inclined hole 241.

[0069] When the fixed mold assembly 1 and the movable mold assembly 2 are in the open state, the side sliding core 24 is spaced apart from the movable core 23 by a first distance; when the fixed mold assembly 1 and the movable mold assembly 2 are in the first closed state, the side sliding core 24 is spaced apart from the movable core 23 by a second distance, and a gap 2a is formed between the side sliding core 24 and the movable core 23, and the second distance is less than the first distance; when the fixed mold assembly 1 and the movable mold assembly 2 are in the second closed state, the side sliding core 24 abuts against the movable core 23.

[0070] In the embodiment, the inclination angles of all the inclined slides 226 are the same, the lower ends of all the first sliding blocks 25 are connected with the bottom plate 27, and the driving mechanism 4 is connected with the bottom plate 27, and the driving mechanism 4 is used to drive the bottom plate 27 to move up and down, so as to drive all the first sliding blocks 25 to move up and down.

[0071] In the high-speed thin-wall injection molding process, in order to improve the cooling effect on the product, the distance between the cooling water channel on the mold and the molding cavity is close (≤8mm). The cooling water channel is provided on the fixed core 13, the movable core 23 and the side sliding core 24, so in the embodiment, the vacuum passage b is provided on the movable mold base 22, the first sliding block 25 is provided with a first through hole 252 penetrating up and down, and the movable mold base 22 is provided with an air groove 222 communicating with the gap 2a and the upper portion 221a of the first sliding groove 221. As Figure 4 shown in FIG. 6, when the fixed mold assembly 1 and the movable mold assembly 2 are in the first closed state, the air groove 222, the upper portion 221a and the first through hole 252 form the vacuum passage b, and the end of the first through hole 252 communicating with the outside is connected with the vacuum pumping mechanism.

[0072] As Figure 5 and Figure 6As shown, the enclosing mechanism 5 comprises a first enclosing assembly 51 and a second enclosing assembly 52, the first enclosing assembly 51 is arranged on the shaping core 13, the first enclosing assembly 51 comprises a closed ring 511, a first elastic member 512 and a first limiting member 513, the shaping core 13 is provided with an annular groove 131, and the annular groove 131 is wrapped outside the first cavity 132, the closed ring 511 is slidingly arranged in the annular groove 131, the first limiting member 513 is arranged on the shaping core 13 and used for limiting the closed ring 511 from completely leaving the annular groove 131, and the first elastic member 512 is arranged in the annular groove 131 and used for providing an elastic force for moving the closed ring 511 downward;

[0073] As shown in Figure 7 , Figure 9 and Figure 10 , the second enclosing assembly 52 is arranged on the movable die seat 22, the second enclosing assembly 51 comprises a closed column 521 and a base 522, the movable die seat 22 is provided with four second sliding grooves 225, the second sliding grooves 225 are located between every two adjacent side sliding shaping cores 24, the second sliding grooves 225 penetrate the movable die seat 22 from top to bottom, the closed column 521 is slidingly arranged in the second sliding groove 225, the base 522 is located below the movable die seat 22, the base 522 is provided with four third sliding grooves 523, the third sliding grooves 523 are provided with second elastic members 524, the lower end of the closed column 521 extends into the third sliding groove 523, and the lower end of the closed column 521 is provided with a second sliding block 5211, the second sliding block 5211 can slide in the third sliding groove 523 but cannot leave the third sliding groove 523, the second elastic members 524 are used for providing an elastic force for moving the second sliding block 5211 and the closed column 521 upward, the base 522 is connected with the driving mechanism 4, and the elastic force of the second elastic members 524 is smaller than that of the first elastic member 512. When the distance between the surface of each side sliding shaping core 24 and the surface of the movable die seat 22 is not equal, the distance between each closed column 521 and the closed ring 511 after moving upward is also not equal. Therefore, by arranging the third sliding grooves 523 and the second elastic members 524 on the base 522, after a part of the closed columns 521 move upward to abut against the closed ring 511, the base 522 can continue to rise, so that the remaining closed columns 521 can continue to move upward.

[0074] Further, the closed column 521 comprises a filling portion 5212 and a guide column 5213, the filling portion 5212, the guide column 5213 and the second sliding block 5211 are sequentially arranged from top to bottom, the upper end surface of the filling portion 5212 is matched with the lower end surface of the closed ring 511 in shape, the side surface of the filling portion 5212 is matched with the side surface of the side sliding shaping core 24 in shape, the guide column 5213 can slide in the second sliding groove 225, the lower half of the guide column 5213 is of a non-circular structure, and the shape of the third sliding groove 523 is matched with the non-circular structure, so as to limit the rotation of the filling portion 5212.

[0075] When the fixed mold assembly 1 and the movable mold assembly 2 are in the first closed state, there is a gap 2a between the side slide cores 24 and the movable cores 23, and a gap 2b between the side slide cores 24 and the fixed cores 13; the first elastic member 512 pushes the closing ring 511 to move downward, so that the closing ring 511 abuts against all the side slide cores 24 to fill the gap 2b; the driving mechanism 4 drives the base 522 to move upward, so that all the closing columns 521 move upward until all the closing columns 521 abut against the closing ring 511 to fill the space between the adjacent side slide cores 24 and the closing ring 511.

[0076] The ejection assembly 3 includes an ejection plate 31 and a plurality of ejector pins 32, the ejection plate 31 is provided with the ejector pins 32, and the ejection plate 31 is connected with the driving mechanism 4, which is used to drive the ejection plate 31 to move upward when the fixed mold assembly 1 and the movable mold assembly 2 are in the open state, so that the products are ejected from the second cavity 231 by the ejector pins 32. The base 522 is provided with a plurality of accommodation holes 5221 for the ejector pins 32 to pass through.

[0077] It should be noted that, in the embodiment, the driving mechanism 4 does not refer to a single structure, but includes a plurality of driving units, which are correspondingly connected with the movable mold plate 21, the first slide block 25, the base 522 and the ejection plate 31. The driving units can be hydraulic driving mechanisms or screw nut mechanisms.

[0078] In the embodiment, the direction description is only used to indicate the positional relationship between the assemblies / mechanisms, and the arrangement of the assemblies / mechanisms can be adjusted according to actual needs. Figure 11 As shown in FIG. 6, it is a schematic view of the mold of the embodiment arranged on an injection molding machine, in which the fixed mold assembly 1 and the movable mold assembly 2 are distributed from right to left, the right side of the injection molding machine is the injection system, the left side is the driving mechanism 4, and the bottom of the injection molding machine includes a hydraulic and electrical control system. Figure 11

[0079] Embodiment 2

[0080] The process of the embodiment is based on the process of the mold of embodiment 1.

[0081] A process for producing an automotive interior injection molded part, comprising the following steps:

[0082] (1) drying the injection material, and inputting the dried injection material into an injection molding machine to melt the injection material by the injection molding machine;

[0083] (2) the driving mechanism 4 drives the movable mold assembly 2 to move towards the fixed mold assembly 1 to close the movable mold assembly 2 and the fixed mold assembly 1 to form a molding cavity a;

[0084] ​The driving mechanism 4 drives all the first sliders 25 to move towards the fixed mold assembly 1, so that all the side slide cores 24 move towards the movable cores 23 until the second distance is formed between the side slide cores 24 and the movable cores 23, so that the gap 2a is formed between the side slide cores 24 and the movable cores 23; the closing ring 511 is abutted against the side slide core 24 under the elastic force, the driving mechanism 4 drives the base 522 to move towards the fixed mold assembly 1, so that all the closing columns 521 abut against the closing ring 511, so that the air groove 222, the upper part 221a and the first through hole 252 are communicated to form the vacuum passage b, and the vacuum passage b is communicated with the forming cavity a through the gap 2a;

[0085] The vacuumizing mechanism performs vacuumizing on the vacuum passage b, the gap 2a and the forming cavity a, and the injection molding machine injects the hot melt raw material into the forming cavity a;

[0086] (3) After the injection molding for a preset time (the injection molding time can be obtained through simulation simulation before the process), the driving mechanism 4 drives the base 522 to move away from the fixed mold assembly 1, and the driving mechanism 4 drives the first slider 25 to continue to move towards the fixed mold assembly 1, so that all the side slide cores 24 abut against the movable cores 23, so that the side slide cores 24, the movable cores 23 and the shaping core 13 are completely closed, and the vacuum passage b is closed;

[0087] The vacuumizing mechanism stops vacuumizing, and the injection molding machine continues to inject the hot melt raw material into the forming cavity a until the hot melt raw material completely fills the forming cavity a;

[0088] (4) The mold is pressure-keeping and cooled, and after the product is cooled and shaped, the driving mechanism 4 drives the movable mold assembly 2 to move away from the fixed mold assembly 1, and the driving mechanism 4 drives all the first sliders 25 to move away from the fixed mold assembly 1, so that all the side slide cores 24 move away from the movable cores 23, so that the fixed mold assembly 1 and the movable mold assembly 2 are in an open state;

[0089] The driving assembly 4 drives the ejector pin 32 to extend to push the product out of the second cavity 231;

[0090] (5) The product is heat treated.

[0091] The heat treatment includes annealing treatment, that is, the product is heated to a certain temperature and then slowly cooled to eliminate residual stress.

[0092] Through the above process, the vacuum can be drawn on the side of the forming cavity after the mold is closed, the air pressure in the forming cavity is reduced, the molten raw material is more easily moved in the forming cavity, and the edge (front) of the molten raw material in the forming cavity is avoided to wrap air, the generation of bubbles, weld marks and flow marks is reduced, the fitting effect of the molten raw material and the forming cavity is better, the surface quality of the product is improved, the demolding is facilitated, and the internal stress of the product is more uniform.

[0093] Example 3

[0094] This embodiment has a structure that is largely the same as that of Embodiment 1, except that the structure of the vacuum channel b is different.

[0095] In this embodiment, the moving mold base 22 does not have an air groove 222, and the first slider 25 does not have a first through hole 252.

[0096] like Figure 12 As shown, in this embodiment, the moving mold base 22 is provided with at least four air holes 223. The air holes 223 are arranged along the edge of the moving core 23, and the number of air holes 223 can be adjusted according to the actual situation. The air holes 223 are vertical and penetrate the moving mold base 22 at both ends. The upper end of the air hole 223 is connected to the gap 2a. A filling rod 26 is slidably arranged in the air hole 223, and the lower end of the filling rod 26 is connected to the driving mechanism 4. The moving mold base 22 is also provided with a vacuum hole 224. One end of the vacuum hole 224 is connected to the middle of the air hole 223, and the other end is connected to the vacuum mechanism.

[0097] like Figure 13 As shown, when the fixed mold assembly 1 and the moving mold assembly 2 are in the first closed state, the drive mechanism 4 drives the filling rod 26 to descend until the upper end of the filling rod 26 moves to below the air extraction hole 224, so that the gap 2a, the air hole 223 and the air extraction hole 224 are interconnected and form a vacuum channel b.

[0098] Example 4

[0099] This embodiment has a structure that is largely the same as that of Embodiment 1, with the improvement being in the first enclosure component 51.

[0100] like Figure 5 and Figure 6 As shown, the closed ring 511 is composed of four arc-shaped blocks 5111, and pin holes are provided on both sides of the arc-shaped blocks 5111. Adjacent arc-shaped blocks 5111 are connected by pins, and the four arc-shaped blocks 5111 can form a complete closed ring 511.

[0101] The side wall of the arc block 5111 is provided with a vertical cylindrical protrusion, and the side wall of the annular groove 131 is provided with a cylindrical groove that cooperates with the cylindrical protrusion. The cylindrical protrusion and the cylindrical groove play a guiding role to limit the sliding of the arc block 5111 in the annular groove 131.

[0102] The first elastic element 512 is a spring. The upper end of the arc block 5111 has several circular grooves, and the spring is set in the circular grooves. The spring is used to push the arc block 5111 to move downward.

[0103] A slot is provided on the side wall of the arc-shaped block 5111, and the end of the first limiting member 513 extends into the slot. The arc-shaped block 5111 is prevented from dislodging from the annular groove 131 by the cooperation of the slot and the first limiting member 513.

[0104] The lower end of the arc-shaped block 5111 is provided with an arc-shaped groove. When all the arc-shaped blocks 5111 are combined to form the closed ring 511, all the arc-shaped grooves can form a complete annular groove. The annular groove is provided with a sealing ring 514, and the annular groove is provided with a limiting structure, such as a protrusion and a groove, for preventing the sealing ring 514 from being separated from the annular groove.

[0105] When the closed ring 511 abuts against the side sliding core 24 and the closed column 521, the sealing ring 514 can improve the sealing effect of the closed ring 511 and more effectively fill the gap 2b.

[0106] The above is an example of the best embodiment of the present application, and parts not described in detail are common knowledge of ordinary skilled in the art. The protection scope of the present application is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the present application is also within the protection scope of the present application.

Claims

1. A mold for producing injection-molded automotive interior parts, characterized in that, include: Fixed mold assembly (1), moving mold assembly (2), ejection assembly (3), drive mechanism (4) and enclosure mechanism (5); The drive mechanism (4) is used to drive the moving mold assembly (2) and the fixed mold assembly (1) to switch between an open state, a first closed state and a second closed state; When the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state, they will form a molding cavity (a) and several vacuum channels (b) that are connected to the periphery of the molding cavity (a). When the moving mold assembly (2) and the fixed mold assembly (1) are in the second closed state, the vacuum channel (b) will be closed; The drive mechanism (4) is used to drive the ejector assembly (3) to extend when the moving mold assembly (2) and the fixed mold assembly (1) are in the open state; The enclosure mechanism (5) is used to fill the gap between the moving mold assembly (2) and the fixed mold assembly (1) when the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state; The fixed mold assembly (1) includes a fixed mold plate (11), a fixed mold base (12), and a mold core (13). The fixed mold base (12) is disposed on the fixed mold plate (11), and the mold core (13) is disposed on the fixed mold base (12). The moving mold assembly (2) includes a moving template (21), a moving mold base (22), a moving core (23), and multiple side-sliding cores (24). The moving mold base (22) is disposed on the moving template (21), the moving core (23) is disposed on the moving mold base (22), and the side-sliding cores (24) are slidably disposed on the moving mold base (22). All the side-sliding cores (24) are distributed on the periphery of the moving core (23). When the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state, there is a gap (2a) between the side-sliding core (24) and the moving core (23), and the gap (2a) is connected to the vacuum channel (b); The moving mold base (22) is provided with a plurality of first slide grooves (221), a first slide block (25) is provided in the first slide groove (221), an inclined ejector pin (251) is provided on the first slide block (25), and an inclined hole (241) is provided on the side sliding core (24) to cooperate with the inclined ejector pin (251). The moving mold base (22) is provided with a plurality of air holes (223) and air extraction holes (224). One end of the air hole (223) is connected to the gap (2a), and the middle part of the air hole (223) is connected to the air extraction hole (224). A filling rod (26) is slidably arranged inside the air hole (223). When the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state, the driving mechanism (4) is used to drive the filling rod (26) to move away from the gap (2a) so that the air hole (223) and the air extraction hole (224) form a vacuum channel (b).

2. The mold for producing automotive interior injection molded parts according to claim 1, characterized in that, The moving mold base (22) is provided with a plurality of first slide grooves (221), a first slide block (25) is provided in the first slide groove (221), an inclined ejector pin (251) is provided on the first slide block (25), and an inclined hole (241) is provided on the side sliding core (24) to cooperate with the inclined ejector pin (251). The moving mold base (22) is provided with a plurality of air grooves (222). One end of the air groove (222) is connected to the gap (2a), and the other end is connected to the upper part (221a) of the first slide groove (221). The outer side of the first slider (25) is provided with a first through hole (252) connecting the upper part (221a). When the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state, the air groove (222), the upper part (221a) of the first slide groove (221) and the first through hole (252) form a vacuum channel (b).

3. The mold for producing automotive interior injection molded parts according to claim 1, characterized in that, The enclosure mechanism (5) includes a first enclosure component (51) and a second enclosure component (52). The first enclosure component (51) includes a closing ring (511), which is disposed on the molding core (13) and covers the outside of the molding cavity (a). The first enclosure component (51) is used to make the closing ring (511) abut against all the side-sliding cores (24) when the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state. The second enclosure component (52) includes a closing post (521), and a closing post (521) is provided between two adjacent side-sliding cores (24). The closing post (521) is provided on the moving mold base (22). The driving mechanism (4) is used to drive the closing post (521) to extend when the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state, so as to fill the space between the adjacent side-sliding cores (24) and the closing ring (511).

4. The mold for producing automotive interior injection molded parts according to claim 3, characterized in that, The shaping core (13) has an annular groove (131) and the closing ring (511) is slidably disposed in the annular groove (131). The first enclosure component (51) also includes a first elastic element (512) and a first limiting element (513). The first elastic element (512) is disposed between the closing ring (511) and the annular groove (131). The first elastic element (512) is used to provide elastic force to move the closing ring (511) toward the mold assembly (1). The first limiting element (513) is disposed on the shaping core (13) and is used to restrict the closing ring (511) from disengaging from the annular groove (131).

5. The mold for producing automotive interior injection molded parts according to claim 4, characterized in that, The closed ring (511) includes multiple arc-shaped blocks (5111), and all the arc-shaped blocks (5111) can be spliced ​​together to form a complete closed ring (511).

6. The mold for producing automotive interior injection molded parts according to claim 3, characterized in that, The moving mold base (22) is provided with a plurality of second slide grooves (225), and the closing column (521) is slidably disposed in the second slide groove (225). The end of the closing column (521) away from the shaping core (13) is connected to the driving mechanism (4). The driving mechanism (4) is used to push the closing column (521) out when the moving mold assembly (2) and the fixed mold assembly (1) are in the first closed state.

7. The mold for producing automotive interior injection molded parts according to claim 6, characterized in that, The second enclosure component (52) also includes a base (522), which is connected to the drive mechanism (4). The base (522) has several third sliding grooves (523). A second slider (5211) is provided at the end of the closing column (521) away from the shaping core (13). The second slider (5211) is slidably disposed in the third sliding groove (523). A second elastic element (524) is provided in the third sliding groove (523). The second elastic element (524) is used to provide elastic force to move the closing column (521) toward the shaping core (13).

8. A process for producing injection-molded automotive interior parts, characterized in that, Using the mold according to any one of claims 1 to 7 includes the following steps: The raw material is fed into the injection molding machine and then heated and melted by the injection molding machine. The mold is closed to the first closed state, forming a molding cavity (a) and multiple vacuum channels (b) connected to the periphery of the molding cavity (a). The vacuum channel (b) and the molding cavity (a) are evacuated by the vacuum pumping mechanism, and the injection molding machine injects hot melt raw material into the molding cavity (a). After the injection molding preset time, the mold closes to the second closed state, which closes the vacuum channel (b) around the molding cavity (a), and continues to inject hot melt material into the molding cavity (a) until the hot melt material fills the entire molding cavity (a). After the mold is held under pressure and cooled to set, the mold is opened to the open state, and the product is pushed out by the ejector assembly (3); The product is subjected to heat treatment.

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