An injection mold for automobile injection molded parts with demoulding and anti-deformation function and a method of using the same

Abstract

The present invention provides an injection mold for automobile injection molding parts with demoulding and anti-deformation and a method for using the same. The mold comprises an upper mold base and a lower mold base, the top of the lower mold base is provided with a cavity, and the mold cavity is provided with an injection molding part. The present invention is characterized in that a plurality of demoulding mechanism units are provided in the lower mold base, and the demoulding mechanism units include a horizontally extending elastic strip, and a plurality of lifting and jetting assemblies distributed along the length direction of the elastic strip, and an actuating assembly connected to the elastic strip in a transmission manner; the elastic strip is provided with a movable end and a stationary end in the length direction thereof; the bottom end of the lifting and jetting assembly abuts against the elastic strip, and the top end of the lifting and jetting assembly is aligned with the injection molding part; the actuating assembly connects the upper mold base and the elastic strip. The present invention is conducive to preventing automobile injection molding parts from being deformed during demoulding.

Description

Technical Field

[0001] The invention relates to the technical field of automobile injection molding parts, in particular to an automobile injection molding part injection mold with demoulding and anti-deformation function and a use method thereof. Background Art

[0002] Automotive injection molded parts refer to plastic parts produced by injection molding in the production of automobiles. They are usually used to provide structural support, exterior decoration, waterproof protection and other functions for automobiles, such as dashboards, door panels, headlights, etc. The injection molding process is to inject the molten plastic into the mold, and then cool and solidify it in the mold to obtain parts of the desired shape. Then the mold is demolded to remove the cooled and fixed injection molded parts from the mold. The traditional demolding method is to use a lifting rod to lift the injection molded parts at one time with a large force. However, this method is prone to deformation of the injection molded parts during the demolding process, especially for soft or thin-walled injection molded parts. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides an automobile injection mold with demoulding anti-deformation function and a use method thereof, which is helpful to prevent automobile injection molded parts from being deformed during the demoulding process.

[0004] The present invention adopts the following technical solutions.

[0005] An injection mold for automobile injection molded parts with demoulding and anti-deformation, comprising an upper mold base and a lower mold base, wherein a mold cavity is formed at the top of the lower mold base, and an injection molded part is arranged in the mold cavity, and a plurality of demoulding mechanism units are arranged in the lower mold base, wherein the demoulding mechanism units comprise a horizontally extending elastic strip, and a plurality of lifting and jetting assemblies distributed along the length direction of the elastic strip, and an actuating assembly transmission-connected with the elastic strip;

[0006] The elastic strip is provided with a movable end and a stationary end in the length direction thereof;

[0007] The bottom end of the lifting jet assembly abuts against the elastic strip, and the top end of the lifting jet assembly is aligned with the injection molded part;

[0008] The actuating assembly connects the upper die base and the elastic strip;

[0009] During the mold opening process, the actuating assembly can drive the elastic strip to swing up and down, so that the elastic strip hits the lower mold base and the jacking jet assembly connected thereto in the form of pulses;

[0010] The lifting jet assembly can reciprocate up and down under the impact of the elastic strip and inject gas into the gap between the cavity and the injection molded part.

[0011] Furthermore, the elastic strip comprises a first elastic strip and a second elastic strip parallel to each other, and the movable end of the first elastic strip is arranged back to back with the movable end of the second elastic strip;

[0012] During the mold opening process, the swinging directions of the first elastic strip and the second elastic strip are opposite at all times, so that the first elastic strip and the second elastic strip hit the lifting and jetting assembly alternately.

[0013] Furthermore, the lifting and jetting assembly includes a lifting rod slidably connected to the lower die base along the vertical direction, the bottom end of the lifting rod abuts against the elastic strip, and an elastic structure is connected between the lifting rod and the lower die base.

[0014] Furthermore, a vertically extending installation cavity is formed in the lower die base, a piston head slidably connected to the installation cavity is provided on the lifting rod, an air pressure chamber is formed between the piston head and the accommodating cavity, and through holes for the lifting rod to pass through are respectively provided at the top and bottom ends of the installation cavity;

[0015] The lifting rod is formed with an exhaust passage connecting the cavity and the air pressure chamber, and an air intake passage connecting the air pressure chamber and the outside world;

[0016] A first check piece is provided in the exhaust duct, and the first check piece is used to prevent air from flowing from the cavity into the air pressure chamber. A second check piece is provided in the air inlet duct, and the second check piece is used to prevent air from flowing from the air pressure chamber to the outside.

[0017] Furthermore, the elastic structure includes a first elastic ring connecting the piston head and the accommodating chamber, and a second elastic ring connecting the lifting rod and the through hole.

[0018] Furthermore, the elastic strip is provided with an impact block acting on the lower die base.

[0019] Furthermore, the actuating assembly includes a rack extending along the motion trajectory of the upper mold base, a gear fitted with the rack, and a ratchet coaxially connected to the gear to form an integral whole. The upper mold base is connected to a lifting mechanism, the rack is connected to the upper mold base as an integral whole, the gear is rotatably connected to the lower mold base, and the ratchet is overlapped with the elastic strip.

[0020] A method for using an injection mold for automobile injection molded parts with mold release and anti-deformation, based on the above-mentioned injection mold for automobile injection molded parts with mold release and anti-deformation, comprises the following steps:

[0021] S1, drive the upper die base and the lower die base to close the mold through the lifting mechanism;

[0022] S2, injecting molten plastic into the cavity;

[0023] S3. After the plastic in the cavity is cooled and formed, the upper die seat is driven up by the lifting mechanism.

[0024] The beneficial effects of the present invention are:

[0025] The lower mold base of the present invention is provided with a plurality of demoulding mechanism units, each demoulding mechanism unit includes a horizontally extending elastic strip, a plurality of lifting jet assemblies distributed along the length direction of the elastic strip, and an actuating assembly connected to the elastic strip in a transmission manner. During the mold opening process, the actuating assembly drives the elastic strip to swing up and down, so that the elastic strip hits the lower mold base and the lifting jet assembly thereon in the form of a pulse. In this way, the lower mold base will vibrate when hit, so that the injection molded part in the cavity will loosen, thereby reducing the lifting resistance of the injection molded part. At the same time, the lifting jet assembly can move back and forth up and down under the impact of the elastic strip, and then hit the injection molded part with a smaller force for multiple times, so as to lift the injection molded part, effectively avoiding the deformation of the injection molded part caused by lifting the injection molded part with a larger force at one time. In addition, the lifting jet assembly after being hit by the elastic strip can also inject gas into the gap between the cavity and the injection molded part, so as to tear open the connection between the injection molded part and the cavity, which helps to separate the injection molded part from the cavity. Moreover, when the gas flows from the gap between the injection molded part and the cavity to the outside, the gas can carry the heat from the injection molded part, thereby helping to cool the injection molded part.

[0026] Based on the fact that the multiple lifting and jetting assemblies in each demoulding mechanism unit are distributed along the length direction of the elastic strip, and the elastic strip is provided with a movable end and a stationary end in its length direction, when the elastic strip swings up and down, the lifting and jetting assemblies closer to the movable end of the elastic strip are subjected to a greater impact force - that is, the force on the lifting and jetting assemblies gradually increases from the stationary end to the movable end of the elastic strip, resulting in uneven force on the multiple lifting and jetting assemblies, thereby making the force with which the multiple lifting and jetting assemblies impact the injection molded parts also uneven, which in turn helps to separate the injection molded parts from the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0029] Figure 2 for Figure 1 A magnified view of part A;

[0030] Figure 3 Schematic diagram of the structure of the first elastic strip and the second elastic strip of this embodiment.

[0031] Description of reference numerals:

[0032] Upper die seat 1,

[0033] Lower die base 2, cavity 21, mounting cavity 22, air pressure chamber 23,

[0034] Injection molded parts 3,

[0035] The first elastic strip 41, the second elastic strip 42,

[0036] Lifting jet assembly 5,

[0037] Lifting rod 51, exhaust duct 511, air inlet duct 512,

[0038] Piston head 52,

[0039] The first check member 531, the second check member 532,

[0040] The first elastic ring 541, the second elastic ring 542,

[0041] Actuating assembly 6, rack 61, gear 62, ratchet 63,

[0042] Impact block 7,

[0043] Lifting mechanism 8. DETAILED DESCRIPTION

[0044] The drawings are only used for illustrative purposes and should not be construed as limitations of this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product.

[0045] For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The technical solution of the present invention is further described below in conjunction with the drawings and embodiments.

[0046] As shown in the accompanying drawings, an injection mold for automobile injection molded parts with demoulding and anti-deformation function comprises an upper mold base 1 and a lower mold base 2, a cavity 21 is formed at the top of the lower mold base 2, an injection molded part 3 is arranged in the cavity 21, and a plurality of demoulding mechanism units are arranged in the lower mold base 2, the demoulding mechanism units comprise a horizontally extending elastic strip, a plurality of lifting and jetting assemblies 5 distributed along the length direction of the elastic strip, and an actuating assembly 6 transmission-connected to the elastic strip;

[0047] The elastic strip is provided with a movable end and a stationary end in the length direction thereof;

[0048] The bottom end of the lifting jet assembly 5 abuts against the elastic strip, and the top end of the lifting jet assembly 5 is aligned with the injection molded part 3;

[0049] The actuating assembly 6 connects the upper die base 1 and the elastic strip;

[0050] During the mold opening process, the actuating assembly 6 can drive the elastic strip to swing up and down, so that the elastic strip hits the lower mold base 2 and the jacking jet assembly 5 connected thereto in the form of pulses;

[0051] The lifting jet assembly 5 can reciprocate up and down under the impact of the elastic strip and inject gas into the gap between the cavity 21 and the injection molded part 3.

[0052] During the mold opening process, the actuating assembly 6 drives the elastic strip to swing up and down, so that the elastic strip hits the lower mold base 2 and the lifting jet assembly 5 thereon in the form of a pulse. In this way, the lower mold base 2 will vibrate when hit, so that the injection molded part 3 in the cavity 21 is loosened, thereby reducing the lifting resistance of the injection molded part 3. At the same time, the lifting jet assembly 5 can move back and forth up and down under the impact of the elastic strip, and then hit the injection molded part 3 with a smaller force for many times, so as to lift the injection molded part 3, effectively avoiding the deformation of the injection molded part 3 caused by lifting the injection molded part 3 with a larger force at one time. In addition, the lifting jet assembly 5 after being hit by the elastic strip can also inject gas into the gap between the cavity 21 and the injection molded part 3, so as to tear open the connection between the injection molded part 3 and the cavity 21, which helps to separate the injection molded part 3 from the cavity 21. In addition, in the process of gas flowing from the gap between the injection molded part 3 and the cavity 21 to the outside world, the gas can carry the heat on the injection molded part 3, thereby helping to cool the injection molded part 3.

[0053] Based on the fact that the multiple lifting jet assemblies 5 in each demoulding mechanism unit are distributed along the length direction of the elastic strip, and the elastic strip is provided with a movable end and a stationary end in its length direction, when the elastic strip swings up and down, the lifting jet assembly 5 closer to the movable end of the elastic strip is subjected to a greater impact force - that is, the force on the lifting jet assembly 5 gradually increases from the stationary end to the movable end of the elastic strip, resulting in uneven force on the multiple lifting jet assemblies 5, thereby making the force of the multiple lifting jet assemblies 5 impacting the injection molded part 3 also uneven, which in turn helps to separate the injection molded part 3 from the mold.

[0054] Preferably, the elastic strip includes a first elastic strip 41 and a second elastic strip 42 parallel to each other, and the movable end of the first elastic strip 41 is arranged back to back with the movable end of the second elastic strip 42;

[0055] During the mold opening process, the swinging directions of the first elastic strip 41 and the second elastic strip 42 are opposite at all times, so that the first elastic strip 41 and the second elastic strip 42 hit the lift jet assembly 5 alternately. For the lift jet assembly 5 closest to the movable end of the first elastic strip 41, the first elastic strip 41 has the greatest impact force on it, while the second elastic strip 42 has the least impact force on it. When the first elastic strip 41 hits the lift jet assembly 5 upward, the second elastic strip 42 swings downward; and when the second elastic strip 42 hits the lift jet assembly 5 upward, the first elastic strip 41 swings downward, so that the first elastic strip 41 hits the lift jet assembly 5 closest to the static end of the first elastic strip 41 with the greatest force and the second elastic strip 42 hits the lift jet assembly 5 alternately with the smallest force. On the contrary, for the lift jet assembly 5 closest to the movable end of the second elastic strip 42, the first elastic strip 41 hits the lift jet assembly 5 alternately with the smallest force and the second elastic strip 42 hits the lift jet assembly 5 alternately with the greatest force. Finally, the total impact force on the lifting jet assembly 5 closest to the movable end of the first elastic strip 41 and the lifting jet assembly 5 closest to the movable end of the second elastic strip 42 tends to be averaged, which helps to evenly demold the injection molded part 3 and prevent the injection molded part 3 from being stuck by the cavity 21 during the demolding process.

[0056] Preferably, the lifting jet assembly 5 includes a lifting rod 51 that is slidably connected to the lower mold base 2 in the vertical direction, the bottom end of the lifting rod 51 abuts against the elastic strip, and an elastic structure is connected between the lifting rod 51 and the lower mold base 2, wherein the elastic structure makes the lifting rod 51 have a tendency to stabilize in the initial state. During the mold opening process, the elastic strip hits the bottom end of the lifting rod 51, driving the lifting rod 51 to move upward, so that the top end of the lifting rod 51 hits the injection molded part 3. It should be noted that while the lifting rod 51 moves upward after being hit by the elastic strip, it will also vibrate. When the lifting rod 51 contacts the injection molded part 3, the vibration of the lifting rod 51 will be transmitted to the injection molded part 3, which can help the injection molded part 3 to be demolded to a certain extent. After the elastic strip is separated from the lifting rod 51, the lifting rod 51 will move downward under the action of the elastic structure.

[0057] Preferably, a vertically extending installation cavity 22 is formed in the lower die base 2, a piston head 52 slidably connected to the installation cavity 22 is provided on the lifting rod 51, an air pressure chamber 23 is formed between the piston head 52 and the accommodating cavity, and through holes for the lifting rod 51 to pass through are respectively opened at the top and bottom ends of the installation cavity 22;

[0058] The lifting rod 51 is formed with an exhaust passage 511 connecting the cavity 21 and the air pressure chamber 23, and an air intake passage 512 connecting the air pressure chamber 23 and the outside.

[0059] A first check piece 531 is provided in the exhaust duct 511 for preventing air from flowing from the cavity 21 into the air pressure chamber 23 , and a second check piece 532 is provided in the air inlet duct 512 for preventing air from flowing from the air pressure chamber 23 to the outside.

[0060] In this embodiment, an air pressure chamber 23 is formed between the bottom end of the piston head 52 and the installation cavity 22. When the elastic strip hits the lifting rod 51 to move the lifting rod 51 upward, the piston head 52 moves upward following the lifting rod 51, so that the volume of the air pressure chamber 23 increases, and the outside air enters the air pressure chamber 23 under the action of atmospheric pressure. When the elastic strip is separated from the lifting rod 51, the lifting rod 51 moves downward under the action of the elastic structure, so that the volume of the air pressure chamber 23 decreases, and the air in the air pressure chamber 23 flows into the gap between the injection molded part 3 and the cavity 21 through the exhaust duct 511. It can be understood that the air pressure chamber 23 injects air into the gap between the injection molded part 3 and the cavity 21 during the downward movement of the lifting rod 51, which helps to prevent the injection molded part 3 that was originally slightly lifted by the lifting rod 51 from moving downward following the lifting rod 51 and re-fitting with the cavity 21, thereby resulting in low demoulding efficiency.

[0061] In this embodiment, the first check member 531 and the second check member 532 are both conical valve flaps.

[0062] Preferably, the elastic structure includes a first elastic ring 541 connecting the piston head 52 and the accommodating chamber, and a second elastic ring 542 connecting the lifting rod and the through hole. The inner side wall of the first elastic ring 541 is connected to the outer side wall of the piston head 52 as a whole, and the outer side wall of the first elastic ring 541 is connected to the inner side wall of the accommodating chamber as a whole; the inner side wall of the second elastic ring 542 is connected to the outer side wall of the lifting rod as a whole, and the outer side wall of the second elastic ring 542 is connected to the inner side wall of the through hole as a whole. The first elastic ring 541 and the second elastic ring 542 also play a sealing role. The lifting rod will stretch the first elastic ring 541 and the second elastic ring 542 during the movement, so that the first elastic ring 541 and the second elastic ring 542 generate elastic force.

[0063] Preferably, an impact block 7 acting on the lower die base 2 is provided on the elastic strip.

[0064] Preferably, the actuating assembly 6 includes a rack 61 extending along the motion trajectory of the upper die base 1, a gear 62 fitted with the rack 61, and a ratchet 63 coaxially connected to the gear 62 as a whole. The upper die base 1 is connected to a lifting mechanism 8. In this embodiment, the lifting mechanism 8 is a hydraulic push rod. The rack 61 is connected to the upper die base 1 as a whole, the gear 62 is rotatably connected to the lower die base 2, and the ratchet 63 overlaps the elastic strip. It can be understood that when the lifting mechanism 8 drives the upper die base 1 to move upward, the rack 61 moves upward, thereby driving the gear 62 to rotate, and then the ratchet 63 connected to the gear 62 also rotates. During the rotation of the ratchet 63, when the ratchet on the ratchet 63 hooks the active end of the elastic strip, the elastic strip will bend downward under the drive of the ratchet 63 and store elastic force. As the ratchet 63 continues to rotate, when the ratchet 63 releases the elastic strip, the elastic strip swings upward under the action of the elastic force, thereby hitting the lower die base 2 and the lifting jet assembly 5.

[0065] It can be understood that, in this embodiment, the elastic strip includes a first elastic strip 41 and a second elastic strip 42 , and the first elastic strip 41 and the second elastic strip 42 move independently of each other, and the first elastic strip 41 and the second elastic strip 42 are respectively connected to the actuating assembly 6 .

[0066] A method for using an injection mold for automobile injection molded parts with mold release and anti-deformation, based on the above-mentioned injection mold for automobile injection molded parts with mold release and anti-deformation, comprises the following steps:

[0067] S1, driving the upper die base 1 and the lower die base 2 to close the mold through the lifting mechanism 8;

[0068] S2, injecting molten plastic into the cavity 21;

[0069] S3, after the plastic in the cavity 21 is cooled and formed, the upper die base 1 is driven to rise by the lifting mechanism 8.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An injection mold for automobile injection molded parts with demoulding and anti-deformation, comprising an upper mold base and a lower mold base, wherein a cavity is formed at the top of the lower mold base, and an injection molded part is arranged in the cavity, characterized in that: A plurality of demoulding mechanism units are arranged in the lower mold base, and the demoulding mechanism units include a horizontally extending elastic strip, a plurality of lifting and jetting assemblies distributed along the length direction of the elastic strip, and an actuating assembly transmission-connected with the elastic strip; The elastic strip is provided with a movable end and a stationary end in the length direction thereof; The bottom end of the lifting jet assembly abuts against the elastic strip, and the top end of the lifting jet assembly is aligned with the injection molded part; The actuating assembly connects the upper die base and the elastic strip; During the mold opening process, the actuating assembly can drive the elastic strip to swing up and down, so that the elastic strip hits the lower mold base and the jacking jet assembly connected thereto in the form of pulses; The lifting jet assembly can reciprocate up and down under the impact of the elastic strip and inject gas into the gap between the cavity and the injection molded part; The actuating assembly includes a rack extending along the motion trajectory of the upper die base, a gear fitted with the rack, and a ratchet coaxially connected to the gear to form an integral whole. The upper die base is connected to a lifting mechanism, the rack is connected to the upper die base as an integral whole, the gear is rotatably connected to the lower die base, and the ratchet is overlapped with the elastic strip.

2. The automotive injection mold with mold release and anti-deformation function according to claim 1, characterized in that: The elastic strip comprises a first elastic strip and a second elastic strip parallel to each other, and the movable end of the first elastic strip is arranged back to back with the movable end of the second elastic strip; During the mold opening process, the swinging directions of the first elastic strip and the second elastic strip are opposite at all times, so that the first elastic strip and the second elastic strip hit the lifting and jetting assembly alternately.

3. The automotive injection mold with mold release and anti-deformation function according to claim 1, characterized in that: The lifting and jetting assembly comprises a lifting rod slidably connected to the lower die base in a vertical direction, the bottom end of the lifting rod abuts against an elastic strip, and an elastic structure is connected between the lifting rod and the lower die base.

4. The automotive injection mold with mold release and anti-deformation function according to claim 3, characterized in that: A vertically extending installation cavity is formed in the lower die base, a piston head slidably connected to the installation cavity is provided on the lifting rod, an air pressure chamber is formed between the piston head and the accommodating cavity, and through holes for the lifting rod to pass through are respectively provided at the top and bottom ends of the installation cavity; The lifting rod is formed with an exhaust passage connecting the cavity and the air pressure chamber, and an air intake passage connecting the air pressure chamber and the outside world; A first check piece is provided in the exhaust duct, and the first check piece is used to prevent air from flowing from the cavity into the air pressure chamber. A second check piece is provided in the air inlet duct, and the second check piece is used to prevent air from flowing from the air pressure chamber to the outside.

5. The automotive injection mold with demoulding and anti-deformation function according to claim 4, characterized in that: The elastic structure comprises a first elastic ring connecting the piston head and the accommodating cavity, and a second elastic ring connecting the lifting rod and the through hole.

6. The automotive injection mold with mold release and anti-deformation function according to claim 1, characterized in that: The elastic strip is provided with a collision block acting on the lower die seat.

7. A method for using an injection mold for automobile injection molded parts with mold release and anti-deformation, based on the injection mold for automobile injection molded parts with mold release and anti-deformation according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, drive the upper die base and the lower die base to close the mold through the lifting mechanism; S2, injecting molten plastic into the cavity; S3. After the plastic in the cavity is cooled and formed, the upper mold base is driven to rise through the lifting mechanism.

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