Injection mold for casting an automotive interior part

Abstract

The application discloses an injection mold for casting an automotive interior part, comprising a fixed mold, a movable mold and a demolding mechanism; the scheme uses a forming insert of a slanted ejector rod for forming a buckle boss, and a forming insert pin is arranged on the demolding mechanism for forming a mounting hole, and the slanted ejector rod and a lateral slide core move in different directions due to the different angle values of a first included angle and a second included angle. When the mold is opened, a slanted guide column is arranged in a guide through hole of the lateral slide core, the lateral slide core is slidably arranged on a second guide base, that is, the lateral slide core is displaced along the direction of the second included angle under the guidance of the slanted guide column, the slanted ejector rod in a slanted guide hole is driven to move, the slanted ejector rod is slantedly slid along the first demolding direction under the constraint of the first included angle, the forming insert is separated from the buckle boss, then a drive oil cylinder pushes a bearing slide base, the second guide base and the forming insert pin are driven to move along the second demolding direction, and the forming insert pin is separated from the mounting hole.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, specifically to an injection mold for casting automotive interior parts. Background Technology

[0002] As an important component of the car cabin, automotive interior trim not only serves a decorative and aesthetic function but also integrates numerous snap-fit ​​structures and mounting holes for assembly and connection. Taking typical interior trim components such as dashboard trim, door panel trim, and A-pillar trim as examples, their bodies typically have snap-fit ​​bosses extending longitudinally or laterally along the vehicle body for snapping and fixing with adjacent sheet metal parts or plastic frames. Simultaneously, the trim panels also have mounting holes perpendicular to the snap-fit ​​bosses for inserting screws or locating pins to achieve a secure connection. Due to the complex shapes and varied curvatures of automotive interior trim components, the extension direction of the snap-fit ​​bosses and the arrangement direction of the mounting holes often form a non-parallel angle, meaning they have different demolding directions.

[0003] When injection molding the aforementioned automotive interior parts, the mold needs to demold the snap-fit ​​bosses and mounting holes separately. In existing technology, multiple molds are typically used to mold local structures with different demolding directions, which are then assembled to form a complete interior part. However, this method of molding individual parts and then assembling them has the following drawbacks: First, the increased number of molds leads to a significant increase in manufacturing costs; second, the seams after assembly affect the appearance quality of the interior parts, making it difficult to meet the high visual consistency requirements of the automotive cabin; third, the assembly accuracy is limited by the molding tolerances of each individual part, making it difficult to guarantee the relative positional accuracy of the snap-fit ​​bosses and mounting holes, resulting in clearances or interference problems during vehicle assembly.

[0004] Some existing technologies attempt to integrate multiple independent demolding mechanisms into a single mold to handle demolding needs in different directions. For example, an inclined ejector mechanism is used to handle the inclined demolding of snap-fit ​​bosses, while a slider mechanism is used to handle the horizontal demolding of mounting holes. However, these mechanisms are driven independently, requiring multiple power sources, resulting in a bulky and complex mold structure. Furthermore, the opening sequence of each mechanism is difficult to coordinate precisely, easily leading to defects such as demolding interference or insufficient demolding, resulting in product tearing and deformation. In addition, automotive interior parts are typically thin-walled, with small distances between snap-fit ​​bosses and mounting holes. Multiple independent mechanisms constrain each other in terms of spatial layout, making it difficult to achieve a compact arrangement within the limited mold cavity area. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an injection mold for casting automotive interior parts, so as to solve at least some of the technical problems mentioned in the background art.

[0006] To achieve the above objectives, a first aspect of the present invention provides an injection mold for casting automotive interior parts, the automotive interior parts having a body and a snap-fit ​​boss extending along a first demolding direction and a mounting hole arranged along a second demolding direction disposed on the body, the first demolding direction and the second demolding direction forming an angle, the injection mold comprising: The mold is equipped with an angled ejector pin and an angled guide post; the top of the angled ejector pin is provided with a molding insert for forming the snap-fit ​​boss. The moving mold is closable and is mounted on the fixed mold; A demolding mechanism is disposed on the moving mold and includes a drive cylinder mounted on the moving mold, a first guide rail base fixed on the moving mold, and a bearing slide slidably mounted on the first guide rail base. The side end face of the bearing slide is fixedly connected to the piston rod of the drive cylinder. A second guide rail base is fixedly mounted on the upper end face of the bearing slide. A lateral slide core is slidably mounted on the second guide rail base. The lateral slide core has a guide hole that mates with an inclined guide post. The axis of the inclined guide post forms a second angle with the axis of the piston rod of the drive cylinder. The inclined guide post passes through the guide hole. The lateral slide core also has an inclined top guide hole. The axis of the inclined top guide hole forms a first angle with the axis of the piston rod of the drive cylinder. The first angle and the second angle have different angle values. An inclined top is fitted into the inclined top guide hole. The rod has one end slidably mounted on a guide limit seat, and the other end has a molding insert for forming the snap-fit ​​boss. When the mold is closed, the molding insert extends into the mold cavity to form the snap-fit ​​boss. When the mold is opened, the rod slides obliquely along the first demolding direction under the guidance of the oblique ejector guide hole and the limiting action of the guide limit seat, so that the molding insert disengages from the snap-fit ​​boss to complete the first stage of oblique demolding. The guide limit seat is mounted on the support plate, and the support plate is fixed on the bearing slide. A molding insert for forming the mounting hole is fixedly mounted on the second guide rail base. The locking wedge is used to press and lock the lateral sliding core to resist the injection pressure when the mold is closed, and to prevent the lateral sliding core from moving backward during the injection process. When the mold is opened, the locking wedge releases the pressing and locking of the lateral sliding core to release the demolding stroke.

[0007] Optionally, the locking wedge is formed into a hollow cavity. When the mold is closed for injection molding, the locking wedge presses and locks the lateral sliding core. The support plate, the inclined ejector rod, and the guide limit seat are all housed in the hollow cavity of the locking wedge.

[0008] Optionally, the sliding fit structure between the first guide rail base and the bearing slide is as follows: trapezoidal guide convex rails are formed on the upper edges of both sides of the first guide rail base, and a dovetail guide groove adapted to it is formed at the bottom of the bearing slide. The trapezoidal guide convex rails are embedded in the dovetail guide grooves and slide along them. The sliding fit structure between the second guide rail base and the lateral slide core is the same as the sliding fit structure between the first guide rail base and the bearing slide.

[0009] Optionally, the sliding fit structure between the end of the inclined push rod and the guide limiting seat is as follows: the guide limiting seat is provided with a U-shaped groove, the inner walls of both sides of the U-shaped groove are provided with limiting guide grooves, the end of the inclined push rod is provided with a matching guide boss, the guide boss is embedded in the limiting guide groove and slides along it.

[0010] Optionally, a stop block is fixed to the upper surface of the end of the first guide rail base away from the drive cylinder.

[0011] Optionally, the support plate is fixed to the bearing slide by a transition pad, the forming pin is fixedly installed on the second guide rail base by a pin pressure plate, and the inclined guide post is fixedly installed on the fixed mold by a guide post support.

[0012] Optionally, the moving mold is further provided with a locking module. One end of the locking module is fixed to the moving mold, and the other end is provided with a guide slope. The lateral sliding core is provided with a mating slope. The inclination angle of the guide slope is the same as the inclination angle of the mating slope. The guide slope and the mating slope are in close contact.

[0013] Optionally, a wear-resistant plate is inclinedly arranged inside the lock module, one side of the wear-resistant plate is coplanar with the guide slope, and one side of the wear-resistant plate is in close contact with the mating slope.

[0014] Optionally, the moving mold is provided with a limiting screw, and the bearing slide is provided with a limiting hole, the limiting hole including a large hole and a small hole, a limiting step is formed between the large hole and the small hole, the cap of the limiting screw is located in the large hole and can move up and down in the large hole, the shank of the limiting screw passes through the large hole and the small hole and is fixed to the moving mold, and there is a certain distance between the limiting step and the cap of the limiting screw when the mold is closed.

[0015] Optionally, the moving mold is further provided with a guide post, one end of which is connected to the fixed mold, and the other end passes through the bearing slide and is fixed to the fixed mold. The moving mold and the bearing slide can move up and down relative to the guide post.

[0016] The specific effects of this invention are as follows: This solution uses the molding insert of the inclined ejector rod to form the snap-fit ​​boss, and sets the molding pin on the demolding mechanism to form the mounting hole. Furthermore, by using different angle values ​​between the first and second included angles, the inclined ejector rod and the lateral sliding core move in different directions. During mold opening, the fixed mold and the moving mold separate. The inclined guide post passes through the guide hole of the lateral sliding core. Since the inclined guide post is fixed to the fixed mold, and the lateral sliding core is slidably mounted on the second guide rail base, the lateral sliding core is displaced along the second included angle direction under the guidance of the inclined guide post. Simultaneously, it drives the inclined ejector rod in the inclined ejector guide hole to move. Under the constraint of the first included angle, the inclined ejector rod slides obliquely along the first demolding direction, causing the molding insert to disengage from the snap-fit ​​boss. Subsequently, the driving cylinder pushes the bearing slide, causing the second guide rail base and the molding pin to move along the second demolding direction, causing the molding pin to disengage from the mounting hole. Because the first included angle and the second included angle have different values, the movement trajectories of the inclined ejector and the lateral sliding core are not parallel, and the two do not interfere with each other. Moreover, demolding in two different directions can be completed simultaneously with one mold, eliminating the splicing seam of the component molding, reducing mold cost, and ensuring the relative positional accuracy of the snap-fit ​​boss and the mounting hole. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of an automotive interior component according to the present invention; Figure 2 This is a cross-sectional view of an injection mold for casting automotive interior parts according to the present invention.

[0018] In the diagram: 1. Automotive interior trim parts; 11. Snap-on boss; 12. Mounting hole; 2. Fixed mold; 21. Angled guide pillar; 31. Angled ejector rod; 32. Molded insert; 3. Moving mold; 4. Demolding mechanism; 41. Drive cylinder; 42. First guide rail base; 43. Bearing slide; 44. Second guide rail base; 45. Lateral slide core; 451. Guide through hole; 452. Angled ejector guide hole; 22. Locking wedge; 50. Trapezoidal guide rail; 51. Dovetail guide groove; 55. Stop block; 33. Locking module; 34. Wear-resistant plate; 35. Guide pillar. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1As shown, the automotive interior trim 1 has a thin-walled body and a plurality of snap-fit ​​bosses 11 extending along a first demolding direction and a plurality of mounting holes 12 arranged along a second demolding direction on the body. The first demolding direction and the second demolding direction form an angle.

[0021] like Figure 2 As shown, this embodiment provides an injection mold for an automotive interior component 1.

[0022] Injection molds include a fixed mold (2), a moving mold (3), and a demolding mechanism (4).

[0023] The fixed mold 2 is provided with an inclined ejector rod 31 and an inclined guide post 21; the top of the inclined ejector rod 31 is provided with a molding insert 32 for forming the snap-fit ​​boss 11.

[0024] The moving mold 3 is set on the fixed mold 2 in an openable and closable manner.

[0025] The demolding mechanism 4 is mounted on the moving mold 3 and includes a drive cylinder 41 mounted on the moving mold 3, a first guide rail base 42 fixed on the moving mold 3, and a bearing slide 43 slidably mounted on the first guide rail base 42. The side end face of the bearing slide 43 is fixedly connected to the piston rod of the drive cylinder 41. A second guide rail base 44 is fixedly mounted on the upper end face of the bearing slide 43. A lateral slide core 45 is slidably mounted on the second guide rail base 44. The lateral slide core 45 has a guide through hole 451 that cooperates with the inclined guide post 21. The axis of the inclined guide post 21 forms a second angle with the axis of the piston rod of the drive cylinder 41. The inclined guide post 21 passes through the guide through hole 451. The lateral slide core 45 also has an inclined top guide hole 452. The axis of the inclined top guide hole 452 forms a first angle with the axis of the piston rod of the drive cylinder 41. The angle values ​​of the first angle and the second angle are different. 2. An inclined ejector rod 31 is installed inside the mold. One end of the inclined ejector rod 31 is slidably mounted on the guide limit seat, and the other end is provided with a molding insert 32 for forming the snap-fit ​​boss 11. When the mold is closed, the molding insert 32 extends into the mold cavity to form the snap-fit ​​boss 11. When the mold is opened, the inclined ejector rod 31 slides obliquely along the first demolding direction under the guidance of the inclined ejector guide hole 452 and the limiting action of the guide limit seat, so that the molding insert 32 disengages from the snap-fit ​​boss 11 to complete the first stage of oblique demolding. The guide limit seat is mounted on the support plate, and the support plate is fixed on the bearing slide 43. A molding insert for forming the mounting hole 12 is fixedly installed on the second guide rail base 44. The locking wedge block 22 is used to press and lock the side slide core 45 to resist the injection pressure when the mold is closed, and to prevent the side slide core 45 from moving backward during the injection process. When the mold is opened, the locking wedge block 22 releases the pressing and locking of the side slide core 45 to release the demolding stroke.

[0026] By setting the inclined guide post 21 on the fixed mold 2 and the demolding mechanism 4 on the moving mold 3, the relative movement of the inclined guide post 21 and the demolding mechanism 4 during the separation of the moving mold 3 and the fixed mold 2 during mold opening is achieved. The automotive interior part 1 has a snap-fit ​​boss 11 extending along the first demolding direction and a mounting hole 12 arranged along the second demolding direction, with the two directions forming an angle. If traditional multi-mold molding is used, the relative positional accuracy of the snap-fit ​​boss 11 and the mounting hole 12 is difficult to guarantee, and the splicing seam after assembly affects the appearance. In this solution, the molding insert 32 of the inclined ejector rod 31 is used to mold the snap-fit ​​boss 11, and the molding insert is set on the demolding mechanism 4 to mold the mounting hole 12. Furthermore, by using different angle values ​​of the first and second included angles, the inclined ejector rod 31 and the lateral sliding core 45 move in different directions respectively. When the mold is opened, the fixed mold 2 and the moving mold 3 are separated. The inclined guide post 21 is inserted into the guide through hole 451 of the side slide core 45. Since the inclined guide post 21 is fixed to the fixed mold 2, the side slide core 45 is slidably installed on the second guide rail base 44. Therefore, the side slide core 45 is displaced along the second included angle direction under the guidance of the inclined guide post 21. At the same time, it drives the inclined ejector rod 31 in the inclined ejector guide hole 452 to move. Under the constraint of the first included angle, the inclined ejector rod 31 slides obliquely along the first demolding direction, so that the molding insert 32 is disengaged from the snap-fit ​​boss 11. Then, the driving cylinder 41 pushes the bearing slide 43, which drives the second guide rail base 44 and the molding insert to move along the second demolding direction, so that the molding insert is disengaged from the mounting hole 12. Since the first included angle and the second included angle have different angle values, the movement trajectories of the inclined push rod 31 and the lateral sliding core 45 are not parallel, and the two do not interfere with each other. Moreover, demolding in two different directions can be completed simultaneously with one mold, eliminating the splicing seam of the component forming, reducing the mold cost, and ensuring the relative positional accuracy of the buckle boss 11 and the mounting hole 12.

[0027] As an optional implementation, the locking wedge 22 is made into a hollow cavity. When the mold is closed for injection molding, the locking wedge 22 presses and locks the lateral sliding core 45. The support plate, the inclined ejector rod 31 and the guide limit seat are all housed in the hollow cavity of the locking wedge 22.

[0028] The side slide core 45 is reliably locked in place by the tight fit between the clamping inclined surface and the pressure-bearing inclined surface of the side slide core 45 during mold closing. Specifically, during injection molding, molten plastic is injected into the mold cavity under high pressure, generating enormous injection pressure on the side slide core 45. If the side slide core 45 moves backward, it will cause the molding dimensions of the mounting hole 12 to be out of tolerance or even result in product scrap. The locking wedge block 22 has a clamping inclined surface on the side facing the moving mold 3. When the mold closes, this clamping inclined surface is in close contact with the corresponding inclined surface of the side slide core 45. The injection pressure is decomposed into a normal force perpendicular to the inclined surface and a frictional force along the inclined surface by utilizing the self-locking principle of the inclined surface. The normal force is borne by the locking wedge block 22 and transmitted to the fixed mold 2, thereby preventing the side slide core 45 from moving backward. Meanwhile, the locking wedge 22 has a hollow cavity inside, and the inclined ejector rod 31 is housed in the hollow cavity, so that the inclined ejector rod 31 and the locking wedge 22 form a nested layout in space. There is no need to reserve external space for the inclined ejector rod 31 separately, which effectively reduces the axial size occupied by the mold between the fixed mold 2 and the moving mold 3, making the mold structure more compact. It is especially suitable for molding thin-walled parts such as automotive interior parts 1 with small distances between the snap-fit ​​boss 11 and the mounting hole 12.

[0029] As an optional implementation, the sliding fit structure between the first guide rail base 42 and the bearing slide 43 is as follows: trapezoidal guide convex rails 50 are formed on the upper edges of both sides of the first guide rail base 42, and dovetail guide grooves 51 adapted to it are formed at the bottom of the bearing slide 43. The trapezoidal guide convex rails 50 are embedded in the dovetail guide grooves 51 and slide along them. The sliding fit structure between the second guide rail base 44 and the lateral slide core 45 is the same as the sliding fit structure between the first guide rail base 42 and the bearing slide 43.

[0030] The trapezoidal guide rail 50 and the dovetail guide groove 51 are engaged to achieve precise guidance and stable support for the bearing slide 43 and the lateral slide core 45 in their respective directions of motion. Specifically, during the demolding process, the bearing slide 43 is pushed by the drive cylinder 41 and needs to slide linearly along the first guide rail base 42 to drive the second guide rail base 44 and the forming insert to complete the demolding action in the second demolding direction; the lateral slide core 45 is driven by the inclined guide post 21 and needs to slide linearly along the second guide rail base 44 to complete its own lateral displacement. If the sliding fit clearance is too large, the bearing slide 43 and the lateral slide core 45 will wobble during movement, causing misalignment and collision between the forming insert and the mounting hole 12, and between the inclined ejector rod 31 and the snap-fit ​​boss 11, damaging the mold or product. This design employs a trapezoidal guide rail 50 embedded in a dovetail guide groove 51. The inclined surfaces on both sides of the trapezoidal section form surface contact with the corresponding inclined surfaces of the dovetail groove, restricting both vertical movement and lateral swaying, resulting in high guiding accuracy and strong load-bearing capacity. Simultaneously, the symmetrically arranged trapezoidal guide rails 50 along the upper edges of both sides ensure balanced force distribution on the bearing slide 43, avoiding eccentric wear caused by unilateral guidance. The second guide rail base 44 and the lateral sliding core 45 adopt the same structure, ensuring the consistency and interchangeability of the sliding pairs within the demolding mechanism 4, and reducing processing and maintenance costs.

[0031] As an optional implementation, the sliding fit structure between the end of the inclined push rod 31 and the guide limit seat is as follows: a U-shaped groove is formed on the guide limit seat, and a limit guide groove is formed on the inner walls of both sides of the U-shaped groove. A guide boss is formed at the end of the inclined push rod 31 to match it. The guide boss is embedded in the limit guide groove and slides along it.

[0032] The precise guidance and stroke limitation of the inclined ejector rod 31 during its oblique movement are achieved through the cooperation of the guide boss and the limiting guide groove. Specifically, when the mold opens, the inclined ejector rod 31 needs to perform a compound movement along the first demolding direction under the constraint of the inclined ejector guide hole 452, that is, it simultaneously has a displacement component along the piston rod direction and a displacement component perpendicular to this direction. The guide limiting seat has a U-shaped slide groove, and the guide boss at the end of the inclined ejector rod 31 is embedded in the limiting guide groove. The inner walls on both sides of the limiting guide groove form a clamping constraint on the guide boss, so that the inclined ejector rod 31 can only slide along the extension direction of the limiting guide groove, thereby transforming the angular constraint of the inclined ejector guide hole 452 into a deterministic trajectory of the end of the inclined ejector rod 31. Without this guiding cooperation, the inclined ejector rod 31 may twist or deviate during movement, resulting in uneven distribution of demolding force between the molding insert 32 and the snap-fit ​​boss 11, causing scratches or breakage on the surface of the snap-fit ​​boss 11. Meanwhile, the bottom of the U-shaped groove forms a lower limit on the guide boss, preventing the inclined ejector rod 31 from falling downwards under the action of gravity or demolding resistance; the two ends of the limiting guide groove form a stroke end limit on the guide boss, preventing the inclined ejector rod 31 from sliding excessively and disengaging.

[0033] As an optional implementation, a stop block 55 is fixed on the upper surface of the end of the first guide rail base 42 away from the drive cylinder 41.

[0034] The stop block 55 mechanically limits the bearing slide 43, preventing it from sliding out of the first guide rail base 42 under the thrust of the drive cylinder 41. Specifically, after demolding, the drive cylinder 41 needs to retract to reset the bearing slide 43. If the bearing slide 43 continues to slide at the end of the demolding stroke due to inertia or cylinder overshoot, the trapezoidal guide rail 50 may completely disengage from the dovetail guide groove 51, causing the bearing slide 43 to separate from the first guide rail base 42. When the mold closes again, it cannot automatically reset, requiring manual intervention and reassembly, severely affecting production continuity. The stop block 55 is fixed to the upper end surface of the first guide rail base 42. When the bearing slide 43 slides to its limit position, the corresponding end face of the bearing slide 43 mechanically abuts against the stop block 55, forcibly preventing further sliding. This limit is a rigid physical limit, which does not rely on electrical sensors or the stroke control of the cylinder itself. It has high reliability and can effectively protect the mold structure even in the event of abnormal cylinder control signals or fluctuations in the hydraulic system.

[0035] As an optional implementation, the support plate is fixed on the bearing slide 43 by the transition pad, the forming pin is fixedly installed on the second guide rail base 44 by the pin pressure plate, and the inclined guide post 21 is fixedly installed on the fixed mold 2 by the guide post 35 support.

[0036] Modular installation and convenient maintenance of each component are achieved through the connection and fixing of the transition pad, insert pressure plate, and guide post 35 support. Specifically, when the support plate is directly fixed to the bearing slide 43, if the support plate body is thick or the mounting surface is uneven, the contact area with the bearing slide 43 is insufficient, and the fixing bolts are prone to loosening due to uneven force. The transition pad, as an intermediate transition component, has its lower surface in large contact with the upper end surface of the bearing slide 43, and its upper surface precisely matches the bottom surface of the support plate. This not only compensates for the form and position errors of the mounting surface, but also increases the connection rigidity, so that the support plate remains stable when subjected to the lateral demolding reaction force of the inclined ejector rod 31. The forming insert is fixed by the insert pressure plate. Compared with directly embedding into the second guide rail base 44, the pressure plate constrains the axial displacement of the forming insert by surface pressing, and facilitates the disassembly and replacement of worn forming inserts without disassembling the entire second guide rail base 44. The inclined guide post 21 is fixed to the fixed mold 2 by the guide post 35 support. The guide post 35 support and the fixed mold 2 form a detachable connection. When the second included angle needs to be adjusted, only the guide post 35 support with a different tilt angle needs to be replaced. There is no need to modify the fixed mold 2 body, which improves the mold's adaptability to modification.

[0037] As an optional implementation, the moving mold 3 is also provided with a locking module 33. One end of the locking module 33 is fixed to the moving mold 3, and the other end is provided with a guide slope. A mating slope is provided on the lateral sliding core 45. The inclination angle of the guide slope is the same as the inclination angle of the mating slope, and the guide slope and the mating slope are in close contact.

[0038] By tightly fitting the guide slope and the mating slope, the lateral sliding core 45 is auxiliaryly locked during mold closing and guides the oblique movement of the lateral sliding core 45 during mold opening. Specifically, the locking wedge 22 is set on the fixed mold 2 and mainly bears the injection pressure from the direction of the fixed mold 2; while the force exerted by the molten plastic on the lateral sliding core 45 during injection is multidirectional. In addition to the component force in the direction of the fixed mold 2, there is also a component force perpendicular to the parting surface, which attempts to push the lateral sliding core 45 towards the moving mold 3. The locking module 33 is fixed in the moving mold 3, and its guide slope is tightly fitted with the mating slope of the lateral sliding core 45, filling the support gap of the lateral sliding core 45 facing the moving mold 3. Together with the locking wedge 22, it forms a double clamping of the lateral sliding core 45, so that the lateral sliding core 45 is completely constrained in the mold-closed state and cannot move in any direction. When the mold is opened, the lateral sliding core 45 undergoes lateral displacement along the inclined guide post 21. The relative sliding of the guide slope and the mating slope provides additional guidance for the movement trajectory of the lateral sliding core 45, reducing the single-sided cantilever force when relying solely on the mating of the guide through hole 451 and the inclined guide post 21, and reducing the risk of jamming of the lateral sliding core 45.

[0039] As an optional implementation, a wear-resistant plate 34 is inclinedly provided inside the lock module 33. One side of the wear-resistant plate 34 is coplanar with the guide slope, and one side of the wear-resistant plate 34 is in close contact with the mating slope.

[0040] The wear-resistant plate 34 withstands the relative friction between the guide slope and the mating slope, protecting the locking module 33 from wear and extending the mold's service life. Specifically, the lateral sliding core 45 slides relative to the locking module 33 during each mold opening and closing process. The friction between them causes the mating slope to gradually wear, increasing the clearance and reducing the locking accuracy, leading to increased product dimensional deviations. The locking module 33 is typically an integral structure; if its guide slope wears, the entire locking module 33 needs to be replaced, resulting in high maintenance costs and long maintenance cycles. This solution embeds a wear-resistant plate 34 within the locking module 33. One side of the wear-resistant plate 34 is coplanar with the guide slope, and the actual friction occurs between the wear-resistant plate 34 and the mating slope of the lateral sliding core 45. The wear-resistant plate 34 is made of a high-hardness, wear-resistant material, with significantly better wear resistance than the locking module 33's body material. When the wear-resistant plate 34 wears to its limit, only the wear-resistant plate 34 needs to be disassembled and replaced to restore the mating accuracy, eliminating the need to replace the entire locking module 33, significantly reducing maintenance costs and downtime.

[0041] As an optional implementation, the moving mold 3 is provided with a limiting screw, and the bearing slide 43 is provided with a limiting hole, which includes a large hole and a small hole. A limiting step is formed between the large hole and the small hole. The cap of the limiting screw is located in the large hole and can move up and down in the large hole. The shank of the limiting screw passes through the large hole and the small hole and is fixed to the moving mold 3. When the mold is closed, there is a certain distance between the limiting step and the cap of the limiting screw.

[0042] The mechanical contact between the limit screw cap and the limit step precisely controls the end point of the mold opening stroke of the bearing slide 43, preventing excessive demolding. Specifically, during demolding, the drive cylinder 41 pushes the bearing slide 43 to slide, and the molding insert needs to be completely disengaged from the mounting hole 12. However, excessive sliding distance may cause the bearing slide 43 to collide with adjacent parts or cause the molding insert to be excessively exposed and easily damaged. The cap of the limit screw is located in the large hole of the limit hole. When the mold is closed, there is a certain distance between the cap and the limit step, which is the maximum allowable sliding stroke of the bearing slide 43. When the bearing slide 43 slides to the end point of the stroke, the limit step and the cap mechanically contact, forcibly preventing the bearing slide 43 from continuing to slide. This limit is a rigid mechanical limit, which does not depend on the stroke control accuracy of the cylinder. Even if there are pressure fluctuations or control delays in the cylinder, it can ensure that the bearing slide 43 always stays in a safe position. Meanwhile, the rod of the limit screw passes through the small hole and is fixed to the moving mold 3. The diameter of the rod is smaller than the diameter of the large hole, so that the cap has a certain floating space in the large hole, allowing the bearing slide 43 to undergo slight displacement due to temperature changes or force deformation in the mold-closed state, thus avoiding jamming caused by over-positioning.

[0043] As an optional implementation, the moving mold 3 is also provided with a guide post 35. One end of the guide post 35 is connected to the fixed mold 2, and the other end passes through the bearing slide 43 and is fixed to the fixed mold 2. The moving mold 3 and the bearing slide 43 can move up and down relative to the guide post 35.

[0044] The guide post 35 guides the moving mold 3 and the supporting slide 43 through the mold, ensuring precise separation of the moving mold 3 from the fixed mold 2 and stable lifting and lowering of the supporting slide 43 during mold opening. Specifically, during mold opening, the moving mold 3 needs to perform a linear separation motion relative to the fixed mold 2. If the separation trajectory is skewed, lateral interference forces will be generated between the inclined guide post 21 and the guide through hole 451, and between the inclined ejector rod 31 and the inclined ejector guide hole 452, leading to scratches on the mating surfaces or even jamming of the mechanism. One end of the guide post 35 is connected to the fixed mold 2, and the other end passes through the supporting slide 43 and is fixed to the fixed mold 2, forming a rigid guide shaft that passes through the moving mold 3 and the supporting slide 43. When the moving mold 3 and the supporting slide 43 move up and down along the guide post 35, the cylindrical surface of the guide post 35 provides continuous radial constraint, keeping their movement trajectories consistent with the axis of the guide post 35. The guide pillar 35 is located inside the moving mold 3, without occupying external space of the mold. Its structure, which penetrates the bearing slide 43, provides central support to the bearing slide 43 during lifting and lowering, preventing end swaying when the bearing slide 43 is suspended outside the moving mold 3. When the two sets of guide pillars 35 are arranged symmetrically, they can also withstand the overturning moment caused by the eccentricity of the demolding force, maintaining the horizontal posture of the bearing slide 43 and ensuring the coaxiality of the molding insert and the mounting hole 12.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection mold for casting automotive interior parts, the automotive interior parts having a body and a snap-fit ​​boss extending along a first demolding direction and a mounting hole arranged along a second demolding direction disposed on the body, the first demolding direction and the second demolding direction forming an angle, characterized in that: The injection mold includes: The fixed mold is equipped with locking wedges and inclined guide pillars; The moving mold is closable and is mounted on the fixed mold; A demolding mechanism is disposed on the moving mold and includes a drive cylinder mounted on the moving mold, a first guide rail base fixed on the moving mold, and a bearing slide slidably mounted on the first guide rail base. The side end face of the bearing slide is fixedly connected to the piston rod of the drive cylinder. A second guide rail base is fixedly mounted on the upper end face of the bearing slide. A lateral slide core is slidably mounted on the second guide rail base. The lateral slide core has a guide hole that mates with an inclined guide post. The axis of the inclined guide post forms a second angle with the axis of the piston rod of the drive cylinder. The inclined guide post passes through the guide hole. The lateral slide core also has an inclined top guide hole. The axis of the inclined top guide hole forms a first angle with the axis of the piston rod of the drive cylinder. The first angle and the second angle have different angle values. An inclined top is fitted into the inclined top guide hole. The rod has one end slidably mounted on a guide limit seat, and the other end has a molding insert for forming the snap-fit ​​boss. When the mold is closed, the molding insert extends into the mold cavity to form the snap-fit ​​boss. When the mold is opened, the rod slides obliquely along the first demolding direction under the guidance of the oblique ejector guide hole and the limiting action of the guide limit seat, so that the molding insert disengages from the snap-fit ​​boss to complete the first stage of oblique demolding. The guide limit seat is mounted on the support plate, and the support plate is fixed on the bearing slide. A molding insert for forming the mounting hole is fixedly mounted on the second guide rail base. The locking wedge is used to press and lock the lateral sliding core to resist the injection pressure when the mold is closed, and to prevent the lateral sliding core from moving backward during the injection process. When the mold is opened, the locking wedge releases the pressing and locking of the lateral sliding core to release the demolding stroke.

2. The injection mold for automotive interior parts according to claim 1, characterized in that: The locking wedge has a hollow cavity inside. When the mold is closed for injection molding, the locking wedge presses and locks the lateral sliding core. The support plate, the inclined ejector rod and the guide limit seat are all housed in the hollow cavity of the locking wedge.

3. The injection mold for automotive interior parts according to claim 1 or 2, characterized in that: The sliding fit structure between the first guide rail base and the bearing slide is as follows: trapezoidal guide convex rails are formed on the upper edges of both sides of the first guide rail base, and a dovetail guide groove adapted to it is formed at the bottom of the bearing slide. The trapezoidal guide convex rails are embedded in the dovetail guide grooves and slide along them. The sliding fit structure between the second guide rail base and the lateral slide core is the same as the sliding fit structure between the first guide rail base and the bearing slide.

4. The injection mold for automotive interior parts according to claim 1, characterized in that: The sliding fit structure between the end of the inclined push rod and the guide limiting seat is as follows: the guide limiting seat is provided with a U-shaped groove, the inner walls of both sides of the U-shaped groove are provided with limiting guide grooves, the end of the inclined push rod is provided with a matching guide boss, the guide boss is embedded in the limiting guide groove and slides along it.

5. The injection mold for automotive interior parts according to claim 1, characterized in that: A stop block is fixed on the upper surface of the end of the first guide rail base away from the drive cylinder.

6. The injection mold for automotive interior parts according to claim 1, characterized in that: The support plate is fixed on the bearing slide by the transition pad, the forming pin is fixedly installed on the second guide rail base by the pin pressure plate, and the inclined guide post is fixedly installed on the fixed mold by the guide post support.

7. The injection mold for automotive interior parts according to claim 1, characterized in that: The moving mold is also provided with a locking module. One end of the locking module is fixed to the moving mold, and the other end is provided with a guide slope. The lateral sliding core is provided with a mating slope. The inclination angle of the guide slope is the same as the inclination angle of the mating slope. The guide slope and the mating slope are in close contact.

8. The injection mold for automotive interior parts according to claim 7, characterized in that: The lock module is provided with an inclined wear-resistant plate, one side of which is coplanar with the guide slope, and one side of which is in close contact with the mating slope.

9. The injection mold for automotive interior parts according to claim 1, characterized in that: The moving mold is provided with a limiting screw, and the bearing slide is provided with a limiting hole. The limiting hole includes a large hole and a small hole, and a limiting step is formed between the large hole and the small hole. The cap of the limiting screw is located in the large hole and can move up and down in the large hole. The shank of the limiting screw passes through the large hole and the small hole and is fixed to the moving mold. When the mold is closed, there is a certain distance between the limiting step and the cap of the limiting screw.

10. The injection mold for automotive interior parts according to claim 1, characterized in that: The moving mold is also provided with a guide post. One end of the guide post is connected to the fixed mold, and the other end passes through the bearing slide and is fixed to the fixed mold. The moving mold and the bearing slide can move up and down relative to the guide post.

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