Mold closing guide mechanism based on injection molding of automotive trim decorative plate

Abstract

According to the mold closing guide mechanism based on the injection molding of the automotive trim decorative plate, high-precision mold closing guide is realized through the synergistic effect of the split type guide sleeve, the spiral oil groove and the elastic sealing structure. The guide column is fixed to the fixed mold base plate through threaded connection, the guide sleeve is of an upper and lower split structure and is locked through a bolt, the inner wall of the guide sleeve is provided with a double-end spiral oil groove communicated with an external lubricating system, and a bottom positioning ring achieves buffering positioning through an elastic buckle and a soft sealing ring. The guide device is high in guide precision, the guide column and the guide sleeve can be quickly disassembled and assembled, the maintenance cost is reduced, lubricating oil is uniformly distributed in the unique spiral oil groove, the friction loss of the guide column and the guide sleeve is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a mold closing guide mechanism for injection molding of automotive interior trim panels. Background Technology

[0002] In the injection molding production of automotive interior trim panels, the mold closing and guiding mechanism is the core component that ensures precise mold alignment. Its accuracy directly affects the product's dimensional stability, surface finish, and appearance quality.

[0003] Traditional mold-closing guiding mechanisms primarily rely on the cooperation of guide pillars and guide bushings for positioning. However, in practical applications, they suffer from the following technical drawbacks: Existing guiding mechanisms typically employ a one-piece design for the guide pillars. Once the guide pillar or guide bushing wears down, the entire unit must be replaced, leading to long downtime and high spare parts costs. This is especially problematic in the multi-variety, small-batch production of automotive interior parts, where frequent mold changes further exacerbate the maintenance burden. Simultaneously, existing guide bushings often use ordinary steel bushings or grease-lubricated designs, which struggle to maintain a stable lubrication film in the high-temperature, high-pressure injection molding environment. Insufficient lubrication accelerates component failure. Lubrication failure results in direct metal-to-metal friction causing scratches and even mold seizure, necessitating return to the factory for repair in severe cases, increasing production costs. Furthermore, the long-term exposure to the high-frequency impacts of mold opening and closing easily causes wear on the contact surfaces of the guide pillars and guide bushings, leading to increased clearance.

[0004] Therefore, how to mitigate or at least alleviate the aforementioned problems or defects by providing new or otherwise improved structures for the mold closing guide mechanism of automotive interior trim panel injection molding is an urgent issue that needs to be addressed. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, this utility model provides a mold closing guide mechanism based on the injection molding of automotive interior trim panels, which has the advantages of quick replacement and reduced friction.

[0006] To achieve the above objectives, this utility model provides a mold closing guide mechanism for injection molding of automotive interior trim panels, comprising a fixed mold base plate, a moving mold base plate, and a guide mechanism disposed between the two. The guide mechanism includes four sets of guide posts symmetrically distributed at the four corners of the fixed mold base plate, and guide sleeves correspondingly disposed on the moving mold base plate.

[0007] The guide post is installed in the loading and unloading hole of the fixed mold base plate through a threaded connection structure, and its top is provided with a tapered guide head;

[0008] The guide sleeve is a split structure, including an upper guide sleeve and a lower guide sleeve, which are locked together by bolts and then fitted into the mounting holes of the moving mold base plate.

[0009] The inner walls of both the upper and lower guide sleeves are provided with spiral oil grooves, which are connected to the lubrication system through external oil injection holes;

[0010] The bottom of the guide sleeve is provided with a positioning ring, which is detachably connected to the moving mold base plate through a snap-fit ​​structure, and the bottom of the positioning ring is provided with a soft sealing ring.

[0011] As a preferred technical solution, the bottom part of the guide post is provided with external threads, and the loading and unloading hole is provided with internal threads that cooperate with it.

[0012] As a preferred technical solution, the cone angle of the tapered guide head is 15°-30°, and the surface is plated with a hard chrome layer with a thickness of 0.02-0.05mm.

[0013] As a preferred technical solution, the bolt structure includes a screw located at the bottom of the upper guide sleeve and an internal threaded hole located at the top of the lower guide sleeve, which cooperate with each other.

[0014] As a preferred technical solution, the soft sealing ring is made of high-temperature resistant silicone rubber, which is used to buffer the impact force generated during mold closing.

[0015] As a preferred technical solution, the inner wall of the mounting hole is provided with a guide groove, and the positioning ring is accurately installed into the mounting hole through the guide groove.

[0016] As a preferred technical solution, the buckle structure includes a slot, the slot having a slot corresponding to the guide slot, the slot having an elastic claw, and the slot having a locking protrusion.

[0017] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0018] This utility model discloses a mold-closing guide mechanism for injection molding of automotive interior trim panels. By setting a tapered guide head at the front end of the guide pillar, it automatically corrects the misalignment of the moving and fixed molds in the initial stage of mold closing. The hard chrome layer on its surface reduces the coefficient of friction, improves guiding accuracy, shortens mold alignment time, and avoids mold collision damage. Simultaneously, the guide pillar and guide sleeve are equipped with threaded and snap-fit ​​structures, facilitating localized replacement of worn parts. When excessive wear necessitates replacement, the guide pillar and guide sleeve can be quickly disassembled and reassembled, reducing maintenance costs. Furthermore, its unique spiral oil groove evenly distributes lubricating oil, reducing frictional wear between the guide pillar and guide sleeve and extending service life. Additionally, the use of a high-temperature resistant silicone rubber soft sealing ring absorbs a portion of the mold-closing impact force, reducing wear. Attached Figure Description

[0019] Figure 1This is an exploded view of the mold closing guide mechanism based on the injection molding of automotive interior trim panels according to this utility model;

[0020] Figure 2 This utility model Figure 1 Enlarged view of section A;

[0021] Figure 3 This utility model Figure 1 Enlarged view of section B;

[0022] Figure 4 This is a schematic diagram of the mold closing guide mechanism for injection molding of automotive interior trim panels according to this utility model;

[0023] Figure 5 This is a cross-sectional view of the mold closing guide mechanism based on the injection molding of automotive interior trim panels according to this utility model.

[0024] Figure 6 This utility model Figure 5 Enlarged view of section D in the middle.

[0025] The meanings of the markings in the attached diagram are as follows:

[0026] 1. Fixed mold base plate; 101. Loading / unloading hole; 1011. Internal thread; 2. Moving mold base plate; 201. Mounting hole; 202. Guide groove; 3. Guide post; 301. External thread; 302. Tapered guide head; 4. Guide sleeve; 41. Upper guide sleeve; 42. Lower guide sleeve; 43. Bolt structure; 431. Screw; 432. Internal threaded hole; 44. Spiral oil groove; 45. External oil injection hole; 46. Positioning ring; 461. Soft sealing ring; 47. Snap-fit ​​structure; 471. Snap groove; 472. Bayonet; 473. Elastic claw; 474. Locking boss; 5. Hydraulic arm. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0029] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0030] In the embodiments, by Figure 1-6 Give, Figure 1 This is an exploded view of the mold closing guide mechanism based on the injection molding of automotive interior trim panels according to this utility model; Figure 2 This utility model Figure 1 Enlarged view of section A; Figure 3 This utility model Figure 1 Enlarged view of section B; Figure 4 This is a schematic diagram of the mold closing guide mechanism for injection molding of automotive interior trim panels according to this utility model; Figure 5 This is a cross-sectional view of the mold closing guide mechanism based on the injection molding of automotive interior trim panels according to this utility model. Figure 6 This utility model Figure 5 The enlarged view of section D shows a fixed mold base plate 1, a moving mold base plate 2, and a guide mechanism disposed between the two. The guide mechanism includes four sets of guide posts 3 symmetrically distributed at the four corners of the fixed mold base plate 1, and guide sleeves 4 correspondingly disposed on the moving mold base plate 2.

[0031] The guide post 3 is installed in the loading and unloading hole 101 of the fixed mold base plate 1 through a threaded connection structure, and its top is provided with a tapered guide head 302;

[0032] The guide sleeve 4 is a split structure, including an upper guide sleeve 41 and a lower guide sleeve 42. The two are locked together by a bolt structure 43 and then fitted into the mounting hole 201 of the moving mold base plate 2.

[0033] The inner walls of the upper guide sleeve 41 and the lower guide sleeve 42 are provided with spiral oil grooves 44, and the spiral oil grooves 44 are connected to the lubrication system through external oil injection holes 45;

[0034] The bottom of the guide sleeve 4 is provided with a positioning ring 46, which is detachably connected to the moving mold base plate 2 through a snap-fit ​​structure 47, and the bottom of the positioning ring 46 is provided with a soft sealing ring 461.

[0035] The bottom part of the guide post 3 is provided with an external thread 301, and the loading and unloading hole 101 is provided with an internal thread 1011 that mates with it.

[0036] The tapered guide head 302 has a cone angle of 15°-30° and is plated with a hard chrome layer with a thickness of 0.02-0.05mm.

[0037] The bolt structure 43 includes a screw 431 located at the bottom of the upper guide sleeve 41 and an internal threaded hole 432 located at the top of the lower guide sleeve 42, which cooperate with each other.

[0038] The soft sealing ring 461 is made of high-temperature resistant silicone rubber and is used to buffer the impact force generated during mold closing.

[0039] The inner wall of the mounting hole 201 is provided with a guide groove 202, and the positioning ring 46 is accurately installed into the mounting hole 201 through the guide groove 202.

[0040] The buckle structure 47 includes a slot 471, on which a slot 472 corresponding to the guide slot 202 is provided. An elastic claw 473 is provided at the slot 472, and a locking protrusion 474 is provided in the slot 471.

[0041] The specific working process of this utility model is as follows:

[0042] Mold preparation stage

[0043] Guide post installation: Screw the guide post 3 into the loading and unloading hole 101 of the fixed mold base plate 1 through the bottom external thread 301, and use the threaded engagement to achieve fine adjustment of verticality.

[0044] Guide sleeve installation: The upper guide sleeve 41 and the lower guide sleeve 42 are locked together with bolts 43 and embedded in the mounting hole 201 of the moving mold base plate 2. The positioning ring 46 is precisely positioned by the guide groove 202. The elastic claw 473 of the buckle structure 47 and the locking boss 474 ensure a secure fixation.

[0045] Lubrication system startup: Lubricating oil is injected into the spiral oil groove 44 through the oil injection hole 45, and the grease evenly covers the inner wall of the guide sleeve along the spiral groove.

[0046] Mold alignment stage

[0047] Conical guide head guidance: When the hydraulic arm 5 pushes the moving mold base plate 2 to the fixed mold base plate 1, the inlet of the guide sleeve 4 contacts the conical guide head 302 of the guide post 3. The cone angle design allows the guide post to automatically slide into the guide sleeve, correcting the lateral offset.

[0048] Lubrication and drag reduction: The lubricating oil in the spiral oil groove 44 forms an oil film during the insertion of the guide pillar, which reduces the coefficient of friction and ensures smooth mold closing action.

[0049] Mold closing and locking stage

[0050] Hard contact buffer: When the moving and fixed molds are close to closing, the soft sealing ring 461 at the bottom of the positioning ring 46 is compressed and deformed to absorb the impact force of mold closing, and at the same time achieves sealing.

[0051] Precise mold closing: After the guide post 3 is fully inserted into the guide sleeve 4, the four sets of symmetrical guide mechanisms ensure that the moving and fixed molds close in parallel, the mold closing force is evenly distributed, and the mold cavity is aligned.

[0052] Mold opening and reset stage

[0053] Moving mold retraction: After injection molding is completed, the hydraulic arm 5 retracts the moving mold base plate 2 along the guide post 3.

[0054] In summary, the mold-closing guide mechanism for injection molding of automotive interior trim panels of this utility model automatically corrects the misalignment of the moving and fixed molds in the initial stage of mold closing by setting a tapered guide head at the front end of the guide post. The hard chrome layer on its surface reduces the coefficient of friction, improves guiding accuracy, shortens mold alignment time, and avoids mold collision damage. Simultaneously, the guide post and guide sleeve, with their threaded and snap-fit ​​structures, facilitate local replacement of worn parts. When excessive wear necessitates replacement, the guide post and guide sleeve can be quickly disassembled and reassembled, reducing maintenance costs. Furthermore, its unique spiral oil groove evenly distributes lubricating oil, reducing frictional wear between the guide post and guide sleeve and extending service life. The use of a high-temperature resistant silicone rubber soft sealing ring absorbs some of the impact force during mold closing, reducing wear.

[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold closing guide mechanism for injection molding of automotive interior trim panels, characterized in that: It includes a fixed mold base plate (1), a moving mold base plate (2), and a guide mechanism disposed between the two. The guide mechanism includes four sets of guide posts (3) symmetrically distributed at the four corners of the fixed mold base plate (1), and guide sleeves (4) correspondingly disposed on the moving mold base plate (2). The guide post (3) is installed in the loading and unloading hole (101) of the fixed mold base plate (1) through a threaded connection structure, and its top is provided with a tapered guide head (302); The guide sleeve (4) is a split structure, including an upper guide sleeve (41) and a lower guide sleeve (42), which are locked together by a bolt structure (43) and then fitted into the mounting hole (201) of the moving mold base plate (2); The inner walls of the upper guide sleeve (41) and the lower guide sleeve (42) are provided with spiral oil grooves (44), and the spiral oil grooves (44) are connected to the lubrication system through the external oil injection hole (45); The bottom of the guide sleeve (4) is provided with a positioning ring (46), which is detachably connected to the moving mold base plate (2) through a snap-fit ​​structure (47), and the bottom of the positioning ring (46) is provided with a soft sealing ring (461).

2. The mold closing guide mechanism according to claim 1, characterized in that: The bottom part of the guide post (3) is provided with an external thread (301), and the loading and unloading hole (101) is provided with an internal thread (1011) that matches it.

3. The mold closing guide mechanism according to claim 1, characterized in that: The tapered guide head (302) has a cone angle of 15°-30° and is plated with a hard chrome layer with a thickness of 0.02-0.05mm.

4. The mold closing guide mechanism according to claim 1, characterized in that: The bolt structure (43) includes a screw (431) at the bottom of the upper guide sleeve (41) and an internal threaded hole (432) at the top of the lower guide sleeve (42), which cooperate with each other.

5. The mold closing guide mechanism according to claim 1, characterized in that: The soft sealing ring (461) is made of high-temperature resistant silicone rubber and is used to buffer the impact force generated during mold closing.

6. The mold closing guide mechanism according to claim 1, characterized in that: The inner wall of the mounting hole (201) is provided with a guide groove (202), and the positioning ring (46) is accurately installed into the mounting hole (201) through the guide groove (202).

7. The mold closing guide mechanism according to claim 1, characterized in that: The buckle structure (47) includes a slot (471), a slot (472) corresponding to the guide slot (202) is provided on the slot (471), an elastic claw (473) is provided at the slot (472), and a locking boss (474) is provided in the slot (471).

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