An undercut demoulding structure and an automobile instrument panel injection mold

Abstract

The present invention provides an undercut demoulding structure and an automobile instrument panel injection mold. The undercut demoulding structure comprises a front mold, a slanted top assembly, a rear mold and a positioning assembly. The technical solution of the present invention sets a positioning assembly so that one end of the positioning assembly is fixedly connected to the rear mold, and the other end of the positioning assembly passes through the front mold, and the front mold and the positioning assembly can slide with each other. Therefore, when the front mold is away from the rear mold, the front mold relies on the positioning assembly to limit its own sliding position, preventing the front mold from being forced to shift downward, and avoiding deformation of the brim position due to force when the slanted top assembly moves toward the rear mold, resulting in damage.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an undercut demoulding structure and an injection mold for an automobile instrument panel. Background Art

[0002] The car dashboard is a structural component that supports the equipment and decorative parts required for human-machine interface control, and together with other safety parts, it constitutes the cockpit safety system and protects the driver and passengers in the car. Its strength and stiffness are the primary indicators of its performance.

[0003] The brim of the car dashboard is an inverted structure in the injection molding process. In the traditional injection molding solution, the car dashboard mold is large in size and heavy in weight, and the opening direction of the car dashboard brim mold is horizontal. This type of mold opening can easily cause the brim to be deformed due to stress, resulting in damage. Summary of the invention

[0004] The main purpose of the present invention is to provide an undercut demoulding structure and an automobile instrument panel injection mold, aiming to solve the technical problem that when the product is separated from the mold, the brim position is deformed by force and damaged.

[0005] In order to achieve the above object, the present invention provides an undercut demoulding structure, which comprises:

[0006] A front mold, wherein a mold cavity is provided on the front mold;

[0007] A tilting lift assembly, one end of which passes through the front mold and extends to the cavity wall of the mold cavity, and the other end of which is externally connected to a power source;

[0008] A rear mold, which is disposed on the front mold and covers the mold cavity to form an undercut cavity;

[0009] A positioning component, one end of which passes through the front mold, the other end of which is connected to the rear mold, and the positioning component is slidably connected to the front mold;

[0010] When the front mold and the rear mold are opened in the horizontal direction, the front mold and the positioning assembly slide relative to each other, and the power source drives the inclined ejector assembly to move obliquely toward the rear mold to demold the product in the undercut cavity.

[0011] Preferably, the positioning component comprises:

[0012] At least two reset rods, one end of at least two reset rods passes through the front mold, and the other end of at least two reset rods is connected to the rear mold;

[0013] A needle plate, the needle plate is arranged on an end of the front mold away from the rear mold, and the needle plate is spaced apart from the front mold, and at least two ends of the reset rods away from the rear mold are connected to the needle plate;

[0014] A nitrogen spring is connected to an end of the needle plate away from the rear mold.

[0015] Preferably, the positioning component comprises:

[0016] A limiting mechanism, wherein the limiting mechanism is arranged on the rear mold, and the limiting mechanism is detachably connected to an end of the reset rod away from the rear mold, and a through hole is provided on the limiting mechanism;

[0017] A stroke member, the stroke member is arranged on one end of the front mold facing the rear mold, and a limiting protrusion is arranged on one end of the stroke member away from the front mold, the stroke member is arranged in the through hole, and the limiting protrusion is located outside the limiting mechanism;

[0018] Wherein, when the front mold and the rear mold are opened in the horizontal direction, the front mold drives the stroke member away from the rear mold, and when the limiting protrusion is located at the through hole, the reset rod stops moving.

[0019] Preferably, a notch is provided at one end of the reset rod away from the front mold, and the limiting mechanism comprises:

[0020] A fixing member, the fixing member is arranged on the rear mold, the fixing member is provided with the through hole and the card slot, the length direction of the card slot is perpendicular to the length direction of the through hole, and the notch of the card slot faces the reset rod;

[0021] An elastic member, wherein the elastic member is disposed in the card slot and abuts against a bottom of the card slot;

[0022] A horizontal bolt, wherein the horizontal bolt is slidably disposed in the slot, one end of the horizontal bolt abuts against the elastic member, and the other end of the horizontal bolt is disposed in the notch. An adjustment hole is also provided on the horizontal bolt, and the travel member is slidably disposed in the adjustment hole. A gap is left between the limiting protrusion and the end of the horizontal bolt away from the front mold;

[0023] When the mold is opened, the front mold moves away from the rear mold, the cross bolt is engaged in the notch, and pulls the reset rod to move toward the rear mold. When the limiting protrusion abuts against the hole wall of the adjustment hole, the needle plate abuts against the front mold, the elastic part is compressed, the cross bolt disengages from the notch, and the reset rod stops moving.

[0024] Preferably, the positioning component further comprises:

[0025] At least two circular pads are provided, the circular pads being arranged in a one-to-one correspondence with the number of the reset rods, and the circular pads are arranged on one end of the reset rod facing the rear mold.

[0026] Preferably, the inclined top assembly comprises:

[0027] A straight push rod, the straight push rod passes through the front mold;

[0028] An inclined ejector rod, the inclined ejector rod passes through the front mold, one end of the inclined ejector rod away from the rear mold and one end of the straight ejector rod away from the rear mold are both externally connected to the power source, and the straight ejector rod is arranged at an angle to the inclined ejector rod;

[0029] A straight ejector block, the straight ejector block being arranged on one end of the straight ejector rod facing the rear mold;

[0030] An inclined ejector block, wherein the inclined ejector block is slidably arranged on the straight ejector block, the inclined ejector block is connected to one end of the inclined ejector rod facing the rear mold, the sliding direction of the inclined ejector block is perpendicular to the moving direction of the straight ejector block, and the straight ejector block and the inclined ejector block are both arranged on the cavity wall of the mold cavity;

[0031] When the mold is opened, the power source drives the straight ejector rod and the inclined ejector rod to move toward the rear mold, and the inclined ejector block is away from the cavity wall of the mold cavity relative to the straight ejector block, so that the product in the undercut cavity can be demolded.

[0032] Preferably, a sliding groove is provided on the needle plate, the length direction of the sliding groove is the same as the sliding direction of the inclined ejector block relative to the straight ejector block, and the end of the inclined ejector rod away from the rear mold is arranged in the sliding groove.

[0033] Preferably, the inclined roof assembly further comprises:

[0034] Two guide blocks, the two guide blocks are spaced apart on the needle plate, and the sliding groove is located between the two guide blocks;

[0035] Two sliding blocks are respectively arranged on the peripheral wall of the inclined ejector rod, and the two sliding blocks are respectively slidably connected with the two guide blocks.

[0036] Preferably, a guide groove is provided on the guide block, and the sliding block is slidably disposed in the guide groove.

[0037] The present invention further provides an automobile instrument panel injection mold, comprising the undercut demoulding structure described in any one of the above, and the automobile instrument panel injection mold further comprises:

[0038] Base plate;

[0039] A square iron, wherein the square iron is arranged on the bottom plate, and an end of the rear mold away from the front mold is placed on the bottom plate;

[0040] A driving component, two ends of which are respectively connected to the bottom plate and the rear mold, and the driving component is used to drive the rear mold to move away from or close to the bottom plate.

[0041] The technical solution of the present invention is to set a positioning component so that one end of the positioning component is fixedly connected to the rear mold, and the other end of the positioning component passes through the front mold, and the front mold and the positioning component can slide with each other. Therefore, when the front mold is away from the rear mold, the front mold relies on the positioning component to limit its own sliding position, preventing the front mold from being forced to shift downward, and avoiding the deformation of the brim position due to force when the inclined top component is displaced toward the rear mold, causing damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 It is a structural schematic diagram of an embodiment of an undercut demoulding structure of the present invention;

[0044] Figure 2 It is a structural schematic diagram of another embodiment of the undercut demoulding structure of the present invention;

[0045] Figure 3 It is a structural schematic diagram of another embodiment of the undercut demoulding structure of the present invention;

[0046] Figure 4 It is a structural schematic diagram of another embodiment of the undercut demoulding structure of the present invention;

[0047] Figure 5 It is a structural schematic diagram of the limiting mechanism of an embodiment of the undercut demoulding structure of the present invention.

[0048] Description of Figure Numbers:

[0049]

[0050]

[0051] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0055] The invention provides an undercut demoulding structure.

[0056] like Figures 1 to 5 As shown, the undercut demolding structure includes: a front mold 100, on which a mold cavity A is arranged; a tilting top assembly 10, one end of which passes through the front mold 100 and extends to the cavity wall of the mold cavity A, and the other end of which is externally connected to a power source; a rear mold (not shown in the figure), which is arranged on the front mold 100 and covers the mold cavity A to form an undercut cavity; a positioning assembly 20, one end of which passes through the front mold 100, and the other end of which is connected to the rear mold, and the positioning assembly 20 is slidably connected to the front mold 100; wherein, when the front mold 100 and the rear mold are opened in the horizontal direction, the front mold 100 and the positioning assembly 20 slide against each other, and the power source drives the tilting top assembly 10 to move obliquely toward the rear mold to demold the product in the undercut cavity.

[0057] In this embodiment, in the injection mold, a cavity A in the shape of a product injection is provided on the front mold 100, and after the rear mold and the front mold 100 are covered with each other, the rear mold and the cavity A form an inverted cavity. The injection molding product is formed by injecting high-pressure and high-temperature injection molding liquid into the inverted cavity and cooling the injection molding liquid. Due to the position of the brim of the car dashboard, it belongs to an inverted structure in the injection molding process, and the car dashboard mold is large in size and heavy in weight. Therefore, the opening direction of the car dashboard brim mold is horizontal. In order to prevent the front mold 100 and the rear mold from being misaligned when the force is applied when the mold is opened, resulting in the position displacement of the front mold 100 and the rear mold in the direction of gravity, a positioning component 20 is provided, so that one end of the positioning component 20 is fixedly connected to the rear mold, and the other end of the positioning component 20 passes through the front mold 100, and the front mold 100 and the positioning component 20 can slide with each other. Therefore, in the front mold 100, the rear mold 100 and the positioning component 20 can slide with each other. When the mold 100 is away from the rear mold, the front mold 100 relies on the positioning assembly 20 to limit its own sliding position. For example, when the positioning assembly 20 has multiple long rods, one end of the long rod is fixedly connected to the rear mold, and the other end passes through the front mold 100, so that the front mold 100 always slides along the length direction of the long rod, ensuring that the front mold 100 and the rear mold move away from or close to each other in the same direction, and the long rod can support the front mold 100 to prevent the front mold 100 from being displaced downward due to force, and to avoid the brim being deformed due to force when the inclined top assembly 10 moves toward the rear mold, resulting in damage.

[0058] Specifically, the positioning assembly 20 includes: at least two reset rods 21, one end of at least two of the reset rods 21 passes through the front mold 100, and the other end of at least two of the reset rods 21 is connected to the rear mold; a needle plate 22, the needle plate 22 is arranged on the end of the front mold 100 away from the rear mold, and the needle plate 22 is spaced apart from the front mold 100, and the end of at least two of the reset rods 21 away from the rear mold is connected to the needle plate 22; a nitrogen spring 23, the nitrogen spring 23 is connected to the end of the needle plate 22 away from the rear mold. In this embodiment, at least two reset rods 21 are provided, one end of the reset rod 21 is connected to the rear mold, and the other end passes through the front mold 100 and is slidably connected to the front mold 100. In order to improve the stability of demolding, a needle plate 22 can be provided, and at least one end of the two reset rods 21 away from the rear mold is connected to the needle plate 22, and the needle plate 22 is connected to the nitrogen spring 23. When the front mold 100 and the rear mold are opened, the nitrogen spring 23 assists the reset rod 21 to move toward the rear mold, thereby enhancing the synchronous mold opening.

[0059] Specifically, the positioning assembly 20 includes: a limiting mechanism 24, which is arranged on the rear mold, and the limiting mechanism 24 is detachably connected to the end of the reset rod 21 away from the rear mold, and a through hole B is provided on the limiting mechanism 24; a stroke member 25, which is arranged on the end of the front mold 100 facing the rear mold, and a limiting protrusion 251 is provided on the end of the stroke member 25 away from the front mold 100, the stroke member 25 is arranged in the through hole B, and the limiting protrusion 251 is located outside the limiting mechanism 24; wherein, when the front mold 100 and the rear mold are opened in the horizontal direction, the front mold 100 drives the stroke member 25 away from the rear mold, and when the limiting protrusion 251 is located in the through hole B, the reset rod 21 stops moving. In this embodiment, the needle plate 22 is spaced apart from the front mold 100. When opening the mold, in order to prevent the needle plate 22 and the front mold 100 from getting stuck, a limiting mechanism 24 can be provided on the rear mold, and a stroke member 25 can be fixed on the front mold 100. The stroke member 25 is inserted into the through hole B. When the front mold 100 and the rear mold are opened in the horizontal direction, the rear mold drives the limiting mechanism 24 away from the front mold 100. Since the limiting mechanism 24 is detachably connected to the reset rod 21, the rear mold drives the reset rod 21 to move through the limiting mechanism 24. At this time, the needle plate 22 is subjected to force and slowly approaches the front mold 100 until it abuts against the front mold 100. At this time, the limiting protrusion 251 is located in the through hole B, the limiting mechanism 24 is disengaged from the reset rod 21, and the reset rod 21 stops moving, thereby effectively preventing the needle plate 22 and the front mold 100 from getting stuck.

[0060] It can be understood that the distance between the limiting protrusion 251 and the limiting mechanism 24 can be limited, and this distance can be the optimal distance for demoulding to be completed.

[0061] Specifically, a notch C is provided at one end of the reset rod 21 away from the front mold 100, and the limiting mechanism 24 includes: a fixing member 241, the fixing member 241 is arranged on the rear mold, and the fixing member 241 is provided with the through hole B and the slot D, the length direction of the slot D is perpendicular to the length direction of the through hole B, and the notch of the slot D faces the reset rod 21; an elastic member 242, the elastic member 242 is arranged in the slot D, and the elastic member 242 abuts against the bottom of the slot D; a cross bolt 243, the cross bolt 243 is slidably arranged in the slot D, one end of the cross bolt 243 abuts against the elastic member 242, and the cross bolt 24 The other end of the cross bolt 243 is arranged in the notch C, and an adjustment hole E is also opened on the cross bolt 243. The travel member 25 is slidably arranged in the adjustment hole E, and a gap is left between the limiting protrusion 251 and the end of the cross bolt 243 away from the front mold 100; wherein, when the mold is opened, the front mold 100 is away from the rear mold, the cross bolt 243 is engaged in the notch C, and pulls the reset rod 21 to move toward the rear mold. When the limiting protrusion 251 abuts against the hole wall of the adjustment hole E, the needle plate 22 abuts against the front mold 100, the elastic member 242 is compressed, the cross bolt 243 disengages from the notch C, and the reset rod 21 stops moving.

[0062] In this embodiment, a fixing member 241 is fixedly provided on the rear mold, and a through hole B and a slot D are provided on the fixing member 241. The axis of the through hole B is perpendicular to the length direction of the slot D. The cross bolt 243 is slidably provided in the slot D. After the mold is closed, the end of the cross bolt 243 away from the bottom of the slot D is engaged with the notch C. At this time, with the opening operation of the front mold 100 and the rear mold, the rear mold synchronously drags the reset member through the cross bolt 243 and the notch C, and the front mold 100 continuously moves away from the rear mold, and drives the stroke member 25 away from the rear mold, so that the limiting protrusion 251 slowly approaches the adjustment hole E until the limiting protrusion 251 abuts against the hole wall of the adjustment hole E, driving the cross bolt 243 away from the reset rod 21, so that the elastic member 242 is compressed by force, until the cross bolt 243 is completely separated from the reset rod 21, so that the reset rod 21 stops moving, effectively preventing the needle plate 22 from continuing to move toward the front mold 100 and avoiding being stuck with the front mold 100.

[0063] Specifically, the positioning assembly 20 further includes: at least two circular pads 26, the number of the circular pads 26 being arranged in a one-to-one correspondence with the number of the reset rods 21, and the circular pads 26 being arranged on the end of the reset rod 21 facing the rear mold. In this embodiment, a circular pad 26 can be arranged on the end of each reset rod 21 facing the rear mold to prevent the reset rod 21 from being damaged by friction, and the reset rod 21 is also used to facilitate mold adjustment.

[0064] Specifically, the inclined ejector assembly 10 includes: a straight ejector rod 11, the straight ejector rod 11 passes through the front mold 100; an inclined ejector rod 12, the inclined ejector rod 12 passes through the front mold 100, one end of the inclined ejector rod 12 away from the rear mold and one end of the straight ejector rod 11 away from the rear mold are both externally connected to the power source, and the straight ejector rod 11 and the inclined ejector rod 12 are arranged at an angle; a straight ejector block 13, the straight ejector block 13 is arranged on the end of the straight ejector rod 11 facing the rear mold; and an inclined ejector block 14, the inclined ejector block 14 is slidably arranged on On the straight ejector block 13, the inclined ejector block 14 is connected to one end of the inclined ejector rod 12 toward the rear mold, the sliding direction of the inclined ejector block 14 is perpendicular to the movement direction of the straight ejector block 13, and the straight ejector block 13 and the inclined ejector block 14 are both arranged on the cavity wall of the mold cavity A; wherein, when the mold is opened, the power source drives the straight ejector rod 11 and the inclined ejector rod 12 to move toward the rear mold, and the inclined ejector block 14 is away from the cavity wall of the mold cavity A relative to the straight ejector block 13, so as to demold the product in the undercut cavity.

[0065] In this embodiment, the inclined ejector block 14 is slidably arranged on the straight ejector block 13, and a cavity of an undercut structure is formed between the surface of the straight ejector block 13, the surface of the inclined ejector block 14 and the cavity wall of the mold cavity A. Since the straight ejector block 13 is displaced toward the rear mold direction, if the sliding direction of the inclined ejector block 14 is the same as the sliding direction of the straight ejector block 13, undercut demoulding cannot be performed. Therefore, by adopting the inclined ejector rod 12, the inclined ejector rod 12 and the straight ejector rod 11 are set at an angle, and the power source drives the inclined ejector rod 12 to tilt and displace toward the rear mold direction, so that the oblique drive of the inclined ejector rod 12 is decomposed into a first decomposed force (such as a first decomposed force) with the same displacement direction as the straight ejector rod 11. Figure 3 Fx shown), a second decomposed force perpendicular to the displacement direction of the straight push rod 11 (such as Figure 3 As shown in Fy), the second decomposition force is used to drive the inclined ejector block 14 away from the cavity wall of the mold cavity A relative to the straight ejector block 13, thereby realizing the demoulding operation of the product in the undercut mold cavity.

[0066] It is understandable that the power source may be a hydraulic cylinder or a pneumatic cylinder, etc.

[0067] Specifically, the needle plate 22 is provided with a sliding groove F, the length direction of which is the same as the direction in which the inclined ejector block 14 slides relative to the straight ejector block 13, and the end of the inclined ejector rod 12 away from the rear mold is arranged in the sliding groove F. In this embodiment, in order to avoid the inclined ejector rod 12 and the straight ejector rod 11 from causing motion interference with the needle plate 22, a sliding groove F can be provided on the needle plate 22, the length direction of which is the same as the direction in which the inclined ejector block 14 slides relative to the straight ejector block 13, and the length of the sliding groove F is greater than the maximum sliding stroke of the inclined ejector block 14. When the mold is opened, the needle plate 22 is displaced toward the front mold 100, and the inclined ejector rod 12 is tilted and displaced toward the rear mold, so that the inclined ejector rod 12 is displaced relative to the needle plate 22 and along the length direction of the sliding groove F. For example, when the mold is closed, the inclined ejector rod 12 abuts against one end of the sliding groove F in the length direction, and when the mold is opened, the inclined ejector rod 12 slowly displaces toward the other end of the sliding groove F in the length direction.

[0068] Specifically, the lift assembly 10 further includes: two guide blocks 15, the two guide blocks 15 are spaced apart on the needle plate 22, the sliding groove F is located between the two guide blocks 15; two sliders 16, the two sliders 16 are respectively disposed on the peripheral wall of the lift rod 12, and the two sliders 16 are respectively slidably connected with the two guide blocks 15. In this embodiment, in order to improve the sliding stability of the lift rod 12, two guide blocks 15 spaced apart can be disposed on the needle plate 22, and two sliders 16 are fixedly disposed on the peripheral wall of the lift rod 12, and the sliders 16 slide with the guide blocks 15 to limit the sliding position of the lift rod 12.

[0069] Specifically, the guide block 15 is provided with a guide groove G, and the slider 16 is slidably disposed in the guide groove G. As an optional embodiment, in order to further improve the sliding stability of the inclined ejector rod 12, a guide groove G can be provided on each guide block 15, and the slider 16 is slidably disposed in the guide groove G, and the sliding direction of the inclined ejector rod 12 is limited by the guide groove G and the slider 16.

[0070] The present invention proposes an automobile instrument panel injection mold (not shown in the figure), including the above-mentioned undercut demolding structure, and the automobile instrument panel injection mold also includes: a base plate (not shown in the figure); a square iron (not shown in the figure), the square iron is arranged on the base plate, and the end of the rear mold away from the front mold 100 is placed on the base plate; a driving component (not shown in the figure), the two ends of the driving component are respectively connected to the base plate and the rear mold, and the driving component is used to drive the rear mold away from or close to the base plate. The specific structure of the undercut demolding structure refers to the above-mentioned embodiment. Since the automobile instrument panel injection mold adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0071] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An undercut demoulding structure, characterized in that: The undercut demoulding structure comprises: A front mold, wherein a mold cavity is provided on the front mold; A tilting lift assembly, one end of which passes through the front mold and extends to the cavity wall of the mold cavity, and the other end of which is externally connected to a power source, which is a hydraulic cylinder or a pneumatic cylinder; A rear mold, which is disposed on the front mold and covers the mold cavity to form an undercut cavity; A positioning assembly, one end of the positioning assembly passes through the front mold, the other end of the positioning assembly is connected to the rear mold, the positioning assembly is slidably connected to the front mold, the positioning assembly includes a needle plate, a nitrogen spring and at least two reset rods, one end of at least two reset rods passes through the front mold, the other end of at least two reset rods is connected to the rear mold, the needle plate is arranged on the end of the front mold away from the rear mold, and the needle plate and the front mold are spaced apart, at least two reset rods are connected to the needle plate at one end away from the rear mold, the nitrogen spring is connected to the end of the needle plate away from the rear mold, the positioning assembly also includes a limiting mechanism and a stroke member, the limiting mechanism is arranged on the rear mold, and the limiting mechanism is detachably connected to the end of the reset rod away from the rear mold, a through hole is provided on the limiting mechanism, the stroke member is arranged on the end of the front mold facing the rear mold, a limiting protrusion is arranged at the end of the stroke member away from the front mold, the stroke member is arranged in the through hole, and the limiting protrusion is located outside the limiting mechanism; Wherein, the inclined ejector assembly comprises a straight ejector rod, an inclined ejector rod, a straight ejector block and an inclined ejector block, the straight ejector rod passes through the front mold, the inclined ejector rod passes through the front mold, one end of the inclined ejector rod away from the rear mold and one end of the straight ejector rod away from the rear mold are both externally connected to the power source, the straight ejector rod and the inclined ejector rod are arranged at an angle, the straight ejector block is arranged on one end of the straight ejector rod facing the rear mold, the inclined ejector block is slidably arranged on the straight ejector block, the inclined ejector block is connected to one end of the inclined ejector rod facing the rear mold, the sliding direction of the inclined ejector block is perpendicular to the movement direction of the straight ejector block, the straight ejector block and the inclined ejector block are both arranged on the cavity wall of the mold cavity, a sliding groove is opened on the needle plate, the length direction of the sliding groove is the same as the sliding direction of the inclined ejector block relative to the straight ejector block, and the end of the inclined ejector rod away from the rear mold is arranged in the sliding groove; When the front mold and the rear mold are opened in the horizontal direction, the front mold and the positioning assembly slide with each other, and the front mold drives the stroke member away from the rear mold. When the limiting protrusion is located at the through hole, the limiting mechanism is disengaged from the reset rod, and the reset rod stops moving. The power source drives the straight ejector rod and the inclined ejector rod to move toward the rear mold, and the inclined ejector block is away from the cavity wall of the mold cavity relative to the straight ejector block, so that the product in the undercut cavity can be demolded.

2. The undercut demoulding structure according to claim 1, characterized in that: A notch is provided at one end of the reset rod away from the front mold, and the limiting mechanism comprises: A fixing member, the fixing member is arranged on the rear mold, the fixing member is provided with the through hole and the card slot, the length direction of the card slot is perpendicular to the length direction of the through hole, and the notch of the card slot faces the reset rod; An elastic member, wherein the elastic member is disposed in the card slot and abuts against a bottom of the card slot; A horizontal bolt, wherein the horizontal bolt is slidably disposed in the slot, one end of the horizontal bolt abuts against the elastic member, and the other end of the horizontal bolt is disposed in the notch. An adjustment hole is also provided on the horizontal bolt, and the travel member is slidably disposed in the adjustment hole. A gap is left between the limiting protrusion and the end of the horizontal bolt away from the front mold; When the mold is opened, the front mold moves away from the rear mold, the cross bolt is engaged in the notch, and pulls the reset rod to move toward the rear mold. When the limiting protrusion abuts against the hole wall of the adjustment hole, the needle plate abuts against the front mold, the elastic part is compressed, the cross bolt disengages from the notch, and the reset rod stops moving.

3. The undercut demoulding structure according to claim 1, characterized in that: The positioning component also includes: At least two circular pads are provided, the circular pads being arranged in a one-to-one correspondence with the number of the reset rods, and the circular pads are arranged on one end of the reset rod facing the rear mold.

4. The undercut demoulding structure according to claim 1, characterized in that: The inclined top assembly also includes: Two guide blocks, the two guide blocks are spaced apart on the needle plate, and the sliding groove is located between the two guide blocks; Two sliding blocks are respectively arranged on the peripheral wall of the inclined ejector rod, and the two sliding blocks are respectively slidably connected with the two guide blocks.

5. The undercut demoulding structure according to claim 4, characterized in that: The guide block is provided with a guide groove, and the sliding block is slidably arranged in the guide groove.

6. An injection mold for an automobile instrument panel, characterized in that: The undercut demoulding structure according to any one of claims 1 to 5, the automobile instrument panel injection mold further comprises: Base plate; A square iron, wherein the square iron is arranged on the bottom plate, and an end of the rear mold away from the front mold is placed on the bottom plate; A driving component, two ends of which are respectively connected to the bottom plate and the rear mold, and the driving component is used to drive the rear mold to move away from or close to the bottom plate.

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