CN116728716A - Double-colored car handrail injection mold - Google Patents
Double-colored car handrail injection mold Download PDFInfo
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- CN116728716A CN116728716A CN202311021382.1A CN202311021382A CN116728716A CN 116728716 A CN116728716 A CN 116728716A CN 202311021382 A CN202311021382 A CN 202311021382A CN 116728716 A CN116728716 A CN 116728716A
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- core pulling
- skeleton
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- 238000002347 injection Methods 0.000 title claims abstract description 51
- 239000007924 injection Substances 0.000 title claims abstract description 51
- 229920001875 Ebonite Polymers 0.000 claims abstract description 44
- 238000001746 injection moulding Methods 0.000 claims abstract description 37
- 238000010073 coating (rubber) Methods 0.000 claims abstract description 20
- 239000011247 coating layer Substances 0.000 claims abstract description 13
- 239000003292 glue Substances 0.000 claims description 34
- 238000000465 moulding Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 239000004033 plastic Substances 0.000 abstract description 7
- 229920003023 plastic Polymers 0.000 abstract description 7
- 230000000007 visual effect Effects 0.000 abstract description 6
- 239000003086 colorant Substances 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000010985 leather Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000002512 anti-withdrawal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
- B29C45/332—Mountings or guides therefor; Drives therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3026—Arm-rests
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a double-colored automobile handrail injection mold, wherein a hard rubber skeleton and a soft rubber coating layer of the handrail are formed by two plastics with different colors and hardness through double-colored injection molding by one-step injection molding, the mold is provided with a stitch-imitating texture forming structure and a positioning structure of the hard rubber skeleton, stitch-imitating textures are manufactured, the positioning accuracy of the hard rubber skeleton is enhanced to ensure that the soft rubber is well coated by injection molding, and the appearance quality of the handrail is further improved on the premise of ensuring the structural function of the handrail, so that the handrail completely achieves and even exceeds the visual effect of the traditional soft coated handrail, the manufacturing process flow is simple, the production period is short, and the manufacturing cost is low.
Description
Technical Field
The invention relates to the field of automobile interior double-color injection molding, in particular to a double-color automobile armrest injection mold.
Background
Automotive interior armrest soft cladding has become a standard configuration for more and more vehicle types, namely: the plastic skeleton is externally coated with imitation leather or leather, the hard rubber skeleton is molded by injection molding in the traditional production process, the hard rubber skeleton is coated by the imitation leather or leather for line sewing in the later period, a 'true suture' is left on the surface of the handrail, and the whole process flow is complex and the cost is high.
Along with the gradual promotion of automotive interior production technology, technical personnel have developed double-colored car handrail, and as shown in fig. 1, this handrail is processed through the bijection injection molding technology and is formed, and hard rubber skeleton and soft rubber coating are formed by two-shot injection molding respectively by two kinds of plastics of different colours, different hardness, and suture profile modeling structure shaping is on hard rubber skeleton, and it is firm to bond between hard rubber skeleton and the soft rubber coating, has realized good emulation effect under the prerequisite of guaranteeing the product function, has reduced car handrail's production process flow greatly, has practiced thrift manufacturing cost.
However, the two-color automobile armrests on the market still have flaws in appearance, such as "stitching" without texture, or "stitching" texture and "needle eye" are not clear, resulting in "false stitching" that is not beautiful and realistic enough; in addition, the secondary soft rubber injection molding positioning is not accurate enough, so that poor coating performance occurs at certain parts during soft rubber injection molding coating; finally, the double-color automobile handrail can not completely achieve the visual effect of the traditional soft cladding handrail.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a double-color automobile armrest injection mold, wherein a stitch-like texture forming structure and a positioning structure are added on the mold, stitch-like textures are formed, the stitch-like textures and the needle eye are clear, the vivid effect is realized, the coating accuracy of the secondary injection molding soft rubber is ensured, and in order to achieve the purposes, the invention is realized by the following technical scheme: a bicolor injection mold for automobile armrests comprises two groups of rear molds with completely consistent structures, a group of one-shot front molds and a group of two-shot front molds, wherein a mold core is arranged on the rear mold plate, a one-shot cavity is arranged on the one-shot front mold plate, a two-shot cavity is arranged on the two-shot front mold plate,
a plurality of suture-like forming grooves are distributed in the first injection cavity at equal intervals in a linear shape, suture textures are carved in the suture-like forming grooves, the first injection cavity and the mold core are assembled to form a first injection cavity for injection molding of a hard rubber skeleton, a plurality of sections of raised suture-like lines are molded on the surface of the hard rubber skeleton, and gaps exist between two adjacent sections of suture-like lines;
a plurality of suture-like glue sealing grooves are distributed in the two-shot cavity at equal intervals in a linear shape, the suture-like glue sealing grooves are consistent in shape with suture-like glue sealing grooves and are aligned up and down, needle eye forming columns are arranged between two adjacent suture-like glue sealing grooves and are aligned up and down with gaps, the diameter of each needle eye forming column is smaller than the width of each gap, the vertical length of each needle eye forming column is smaller than the height of each gap, the two-shot cavity, the hard glue framework and the mold core are assembled to form the two-shot cavity for injection molding of the soft glue coating layer, after the mold is assembled, the top and two sides of each suture-like glue sealing groove are tightly attached to glue sealing, gaps are reserved between the needle eye forming columns in the gaps in the up-down direction and the side walls so that soft glue can enter the needle eye forming columns, and the positions of the needle eye forming columns are formed;
and a plurality of positioning rib forming grooves are formed in the core of the rear template, suture-imitating positioning ribs are formed on the back of the hard rubber framework, and the suture-imitating positioning ribs are positioned on the back of the suture-imitating part.
The soft plastic melt flows into the two injection mold cavities from the front side and the rear side respectively, and respectively passes through gaps between needle eye forming columns and gaps at the front side and the rear side, and then merges between the two sutures.
The bottom of core, and be close to two and penetrate the position of gluing the mouth and set up skeleton positioning groove, when penetrating the moulding plastics, skeleton positioning groove is used for at the shaping of hard rubber skeleton back location boss, and the cooling in-process can shrink to pressing close to the core direction after the hard rubber skeleton shaping, and skeleton positioning groove inner wall is to location boss application rather than shrink opposite force, avoids being close to two and penetrates the too big and production gap between the core of location boss department shrink of gluing the mouth position, prevents that soft rubber melt from getting into between hard rubber skeleton and the core and taking place the cluster and gluing when penetrating the moulding plastics.
In penetrating the die cavity, be close to imitative suture shaping groove and along imitative suture shaping groove's equidistant a plurality of boss that is provided with of direction of arranging, when penetrating the injection molding, the boss is in hard rubber skeleton surface shaping recess, and when penetrating the injection molding, partial soft rubber melt flows into the recess, at the back shaping spliced pole of soft rubber coating, has further increased the area of contact of hard rubber skeleton and soft rubber coating through a plurality of spliced pole, improves the cohesiveness of both.
The left side and the right side of the handrail are of inverted buckle structures, front molds are adopted for core pulling molding on the two sides, a core pulling block parting surface is arranged between a front needle eye and a rear needle eye, two glue injection channels are arranged at the needle eyes, the channels are narrow and thin, and the injection pressure is high, so that core pulling is punched, and core pulling displacement is caused; for avoiding core pulling displacement, core pulling anti-back components are arranged on the primary injection front mold and the secondary injection front mold, and the core pulling anti-back components comprise: the core pulling device comprises a core pulling block which is arranged on a first injection front template or a second injection front template in a sliding manner, wherein a core pulling guide block and an oil cylinder are arranged on the outer side of the core pulling block, the oil cylinder is arranged vertically, an oil cylinder rod is connected with the core pulling guide block downwards, a guide groove is arranged on the inner side surface of the core pulling guide block, the outer side end of the core pulling block is connected with the guide groove in a sliding manner, a guide block limiting groove is arranged on a rear template, the core pulling guide block moves downwards to clamp the core pulling block in place, and the lower end of the core pulling guide block is inserted into the guide block limiting groove.
The parting surfaces of the core pulling block at the front side and the rear side are at the fillet molding surface change juncture when the core pulling block is assembled with the first injection molding cavity or the second injection molding cavity, and after the second injection molding, the soft rubber coating surface clamp line is arranged between the front needle eye and the rear needle eye and at the fillet molding surface change juncture of the side surface of the front needle eye and the rear needle eye.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the suture-like texture forming structure and the positioning structure are added on the bicolor mould, the suture-like texture is manufactured, the positioning structure enhances the positioning accuracy of the hard rubber skeleton so as to ensure that the soft rubber is well coated by injection molding, the suture-like texture and the needle eye of the handrail are clearly visible and vivid, the appearance quality of the handrail is further improved on the premise of ensuring the structural function of the handrail, the visual effect of the handrail is completely achieved and even surpassed in the traditional soft coated handrail, the manufacturing process flow is simplified, the production period is shortened, and the manufacturing cost is saved.
Drawings
FIG. 1 is a partial view of a one shot mold and a two shot mold of the present invention;
FIG. 2 is a perspective view of a one shot cavity on a one shot front mold plate of the present invention;
FIG. 3 is a schematic diagram of a partial suture molding groove in a single shot cavity of the present invention;
FIG. 4 is a top view of a core on a back form of the present invention;
FIG. 5 is a perspective view of a core on a back form of the present invention;
FIG. 6 is an enlarged partial perspective view of a mandrel of the present invention;
FIG. 7 is a perspective view of an injection molded hard gum frame according to the present invention;
FIG. 8 is a perspective view of a first injection molded hard gum frame according to the present invention;
FIG. 9 is an enlarged partial perspective view of a simulated suture on an injection molded hard gum frame according to the present invention;
FIG. 10 is a schematic diagram of a partial suture molding groove and eye-molding post in a two-shot cavity of the present invention;
FIG. 11 is a perspective view of a two shot molded elastomeric coating of the present invention;
FIG. 12 is a second perspective view of a two-shot molded elastomeric coating of the present invention;
FIG. 13 is a partial perspective view of a molded two-color handrail of the present invention;
FIG. 14 is a state diagram of the core back-out prevention assembly of the present invention when the mold is closed;
FIG. 15 is a perspective view of the core back prevention assembly of the present invention;
fig. 16 is a partial enlarged view of the parting surface of the core back block at the time of the secondary mold closing of the present invention.
In the figure: 1-a core; 11-a positioning rib forming groove; 12-two-shot glue inlet; 13-a skeleton positioning groove; 14-a guide block limit groove; 2-one shot cavity; 21-a suture-imitating forming groove; 211-stitch texture; 22-boss; 3-two-shot cavity; 31-a suture-imitating glue sealing groove; 32-needle eye forming columns; 4-a hard rubber skeleton; 41-imitation suture; 42-gap; 43-suture-imitating positioning ribs; 44-grooves; 5-a soft rubber coating layer; 51-needle eye; 52-connecting columns; 6-loose core anti-withdrawal components; 61-loose core blocks; 62-loose core guide blocks; 63-oil cylinder.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent and understood.
As shown in fig. 1 to 13, the invention provides a bicolor automobile armrest injection mold, which comprises two groups of rear molds with completely consistent structures, a group of one-shot front molds and a group of two-shot front molds, wherein a mold core 1 is arranged on the rear mold plate, a one-shot cavity 2 is arranged on the one-shot front mold plate, a two-shot cavity 3 is arranged on the two-shot front mold plate, a plurality of suture-imitating forming grooves 21 are distributed in the one-shot cavity 2 at equal intervals in a linear shape, two linear grooves formed by the arrangement of the plurality of suture-imitating forming grooves 21 are arranged in parallel in the one-shot cavity 2, as shown in fig. 3, suture textures 211 are carved in the suture-imitating forming grooves 21, the one-shot cavity 2 and the mold core 1 form a mold cavity for injection molding a hard rubber skeleton 4, a plurality of raised suture-imitating 41 are molded on the surface of the hard rubber skeleton 4, gaps 42 exist between the two adjacent suture-imitating 41 are formed on the surface of the hard rubber skeleton 4, and the two suture-imitating 41 are distributed in a structure formed by the suture-imitating 41 along the left and right directions of the hard skeleton 4;
the two-shot cavity 3 is internally provided with a plurality of suture-like seal grooves 31 in a linear equidistant arrangement, the shape of the suture-like seal grooves 31 is consistent with that of the suture-like seal grooves 41, the two adjacent suture-like seal grooves 31 are vertically aligned, the needle eye forming columns 32 are vertically aligned with the gaps 42, the diameter of the needle eye forming columns 32 is smaller than the width of the gaps 42, the vertical length of the needle eye forming columns 32 is smaller than the height of the gaps 42, the two-shot cavity 3, the hard rubber skeleton 4 and the core 1 are clamped to form a two-shot cavity for injection molding of the soft rubber coating 5, after the clamping, the top textured part and two sides of the suture-like seal grooves 41 are tightly attached to the suture-like seal grooves 31, the depth of the suture-like seal grooves 31 is smaller than the height of the suture-like seal grooves 41, the depth of the suture-like seal grooves 31 is equal to the height of the surface of the soft rubber coating 5, the needle eye forming columns 32 are inserted into the gaps 42, gaps between the upper side walls and the side walls are left in the upper and lower directions, and the side walls of the needle eye forming columns 32 are left at the positions of the needle eye forming columns 51, and the depth of the needle eye forming columns is not equal to the needle eye forming columns 51.
Considering that the two-shot cavity 3 pre-presses the hard rubber skeleton 4 formed by one-shot injection molding during two-shot injection molding and the injection pressure exists during two-shot injection molding of the soft rubber coating 5, once the hard rubber skeleton 4 is positioned unstably on the rear template, the texture distortion of the imitated suture 41 can be caused, therefore, the positioning of the hard rubber skeleton 4 is very critical, based on the above problems, other two positioning modes are added besides the local oblique top forming positioning used by the structural characteristics of the handrail product,
the first positioning mode is as follows:
a plurality of groups of grooves are formed in the back of the hard rubber skeleton 4 for positioning at the bottom of the core 1, as indicated by the arrow in fig. 5, and a plurality of positioning ribs are formed in the back of the hard rubber skeleton 4, so that the contact area between the hard rubber skeleton 4 and the core 1 is increased through the plurality of positioning ribs, and the positioning stability of the hard rubber skeleton 4 on the core 1 is enhanced; specifically, as shown in fig. 6, a skeleton positioning groove 13 is disposed at the bottom of the core 1 and near the two-shot glue inlet 12, during one-shot injection molding, the skeleton positioning groove 13 is used for forming a positioning boss on the back of the hard glue skeleton 4, the hard glue skeleton 4 is contracted in the direction close to the core 1 in the cooling process after being formed, the inner wall of the skeleton positioning groove 13 applies a force opposite to the contraction direction to the positioning boss, so that a gap is avoided between the core 1 and the positioning boss near the two-shot glue inlet 12 due to overlarge contraction, and soft glue melt is prevented from entering between the hard glue skeleton 4 and the core 1 during two-shot injection molding.
The second positioning mode is as follows:
as shown in fig. 4, a plurality of positioning rib forming grooves 11 are formed in the core 1 of the rear template, and suture-imitating positioning ribs 43 are formed on the back surface of the hard rubber skeleton 4, wherein as shown in fig. 8, the suture-imitating positioning ribs 43 are positioned on the back surface of the suture-imitating 41; the position of the imitation suture 41 is further enhanced by the imitation suture positioning ribs 43.
Through the two positioning modes, the positioning stability and the positioning accuracy of the hard rubber skeleton 4 are effectively ensured.
As shown in fig. 4, in the present invention, two glue inlets 12 are provided at the front and rear sides of the two-shot mold cavity, and soft glue melt flows into the two-shot mold cavity from the front and rear sides respectively, and after passing through the gaps between the needle eye forming posts 32 and the gaps 42 at the front and rear sides respectively, the soft glue melt merges between the two sutures, so that even if the soft glue melt merges, the welding line is located between the two sutures, the visual effect is not obvious, and the appearance aesthetic degree is not sufficiently affected; on the contrary, if the two injecting glue inlets 12 are arranged on the left and right sides of the two injecting mould cavities, the welding lines can appear on the surface of the soft rubber coating layer 5, extend in the front-back direction, have obvious visual effect and seriously affect the appearance attractiveness.
As shown in fig. 2, in the first injection cavity 2, a plurality of bosses 22 are disposed at equal intervals along the arrangement direction of the stitch-forming grooves 21 and near the stitch-forming grooves 21, during the first injection molding, the bosses 22 are located on the surface of the hard rubber skeleton 4 to form grooves 44, as shown in fig. 7, during the second injection molding, part of the soft rubber melt flows into the grooves 44, and connecting columns 52 are formed on the back of the soft rubber coating layer 5, as shown in fig. 12, the contact area between the hard rubber skeleton 4 and the soft rubber coating layer 5 is further increased by the plurality of connecting columns 52, and the adhesiveness of the two is improved.
The left side and the right side of the handrail are of inverted buckle structures, and the two sides are formed by adopting a front die core pulling mode, as shown in fig. 14; the parting surface of the core-pulling block is arranged between the front needle eye 51 and the rear needle eye 51, the needle eye 51 is provided with two glue injection channels, the glue injection channels are narrow and thin, the core-pulling block can be punched due to high injection pressure, and core-pulling displacement is caused; in order to avoid core-pulling displacement, core-pulling anti-back assemblies 6 are arranged on the primary injection front mold and the secondary injection front mold, as shown in fig. 15, the core-pulling anti-back assemblies 6 comprise: the core pulling block 61 is arranged on the first injection front template or the second injection front template in a sliding manner, a core pulling guide block 62 and an oil cylinder 63 are arranged on the outer side of the core pulling block 61, the oil cylinder 63 is arranged vertically, an oil cylinder rod is downwards connected with the core pulling guide block 62, a guide groove is arranged on the inner side surface of the core pulling guide block 62, the outer side end of the core pulling block 61 is connected with the guide groove in a sliding manner, a guide block limiting groove 14 is arranged on the rear template, the core pulling guide block 62 moves downwards to guide the core pulling block 61 to be assembled in place, and the lower end of the core pulling guide block 62 is inserted into the guide block limiting groove 14; after the die is assembled, the side face of the core-pulling guide block 62 can prop against the core-pulling block 61, and the guide block limiting groove 14 is used for mechanically locking the core-pulling guide block 62, so that the risk of the core-pulling block 61 being broken back due to overlarge injection pressure is effectively reduced.
As shown in the virtual coil out position in fig. 16, the parting surfaces of the core-pulling block 61 when the front side and the rear side are clamped with the first injection cavity 2 or the second injection cavity 3 are at the corner profile change junction, after the second injection molding, the surface clamping line of the soft rubber coating layer 5 appears between the front needle eye 51 and the rear needle eye 51 and at the corner profile change junction of the side surfaces of the front needle eye 51 and the rear needle eye 51, and the position visibility of the clamping line is poor, which is insufficient to influence the appearance aesthetic degree of the handrail.
The double-color automobile handrail is formed by adopting the mold in one step, the hard rubber skeleton 4 and the soft rubber coating layer 5 of the handrail are formed by two plastics with different colors and hardness through double-color injection molding in one step, the hard rubber skeleton 4 and the soft rubber coating layer 5 are firmly bonded, and the appearance state of the handrail is good; in particular, the invention adds the stitch-like texture forming structure and the positioning structure on the mould to manufacture the stitch texture of the stitch-like 41, the positioning structure strengthens the positioning accuracy of the hard rubber skeleton to ensure that the soft rubber is well coated by injection molding, the stitch-like texture and the needle eye of the handrail are clearly visible and vivid, the appearance quality of the handrail is further improved on the premise of ensuring the structural function of the handrail, the visual effect of the handrail is completely achieved and even surpassed that of the traditional soft coated handrail, the manufacturing process flow is simplified, the production period is shortened, and the manufacturing cost is saved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The utility model provides a double-colored car handrail injection mold, includes that two sets of structures are unanimous back mould, a set of front mould and a set of two front mould of penetrating are penetrated to one, set up core (1) on the back template, set up one on the front template of penetrating and penetrate die cavity (2), set up two on the front template of penetrating two and penetrate die cavity (3), its characterized in that:
a plurality of suture-like forming grooves (21) are distributed in the first injection cavity (2) at equal intervals in a linear shape, suture textures (211) are carved in the suture-like forming grooves (21), the first injection cavity (2) and the core (1) are assembled to form an injection cavity for injection molding of the hard rubber skeleton (4), a plurality of sections of raised suture-like lines (41) are molded on the surface of the hard rubber skeleton (4), and gaps (42) exist between two adjacent sections of suture-like lines (41);
a plurality of suture-like seal grooves (31) are distributed in the two-shot cavity (3) at equal intervals in a linear shape, the suture-like seal grooves (31) are consistent in shape with the suture-like seal grooves (41) and are vertically aligned, needle eye forming columns (32) are arranged between two adjacent suture-like seal grooves (31), the needle eye forming columns (32) are vertically aligned with gaps (42), the diameter of the needle eye forming columns (32) is smaller than the width of the gaps (42), the vertical length of the needle eye forming columns (32) is smaller than the height of the gaps (42), the two-shot cavity (3), a hard rubber skeleton (4) and a core (1) are clamped to form two-shot cavities for injection molding of a soft rubber coating layer (5), after the two suture-like seal grooves (31) are clamped, the top and two sides of the suture-like seal grooves (41) are tightly attached to seal the suture-like seal grooves, and gaps are formed in the upper and lower directions and the needle eye forming columns (32) and the upper and lower directions and the side walls between the needle eye forming columns (32) so that soft rubber is left at the needle eye forming positions (51) of the needle eye forming columns (32);
a plurality of positioning rib forming grooves (11) are formed in the core (1) of the rear template, suture-imitating positioning ribs (43) are formed in the back of the hard rubber framework (4), and the suture-imitating positioning ribs (43) are located on the back of the suture-imitating (41).
2. The two-color automobile armrest injection mold according to claim 1, wherein two linear grooves formed by arranging a plurality of suture-like forming grooves (21) are arranged in parallel in the one-shot cavity (2), two suture structures formed by arranging a plurality of sections of suture-like lines (41) are formed on the surface of the hard rubber skeleton (4), the suture-like lines (41) are arranged in an extending manner along the left and right directions of the hard rubber skeleton (4), two injection glue inlets (12) are formed on the front side and the rear side of the two-shot cavity, soft rubber melt flows into the two-shot cavity from the front side and the rear side respectively, and is converged in the middle of the two sutures after passing through gaps between needle eye forming columns (32) and gaps (42) on the front side and the rear side respectively.
3. The bicolor automobile armrest injection mold according to claim 1, wherein a skeleton positioning groove (13) is formed at the bottom of the mold core (1) and close to a two-shot glue inlet (12), the skeleton positioning groove (13) is used for forming a positioning boss on the back of the hard glue skeleton (4) during one-shot injection molding, the hard glue skeleton (4) can shrink towards the direction close to the mold core (1) in the cooling process after being formed, the inner wall of the skeleton positioning groove (13) applies a force opposite to the shrinkage direction of the positioning boss to the positioning boss, so that a gap is formed between the mold core (1) and the excessive shrinkage of the positioning boss close to the two-shot glue inlet (12) is avoided, and soft glue melt is prevented from entering the hard glue skeleton (4) during two-shot injection molding, and glue stringing is prevented.
4. The bicolor automobile armrest injection mold according to claim 1, wherein a plurality of bosses (22) are arranged in the primary injection cavity (2) at equal intervals in the arrangement direction of the suture-like molding grooves (21) and close to the suture-like molding grooves (21), the bosses (22) are positioned on the surface molding grooves (44) of the hard rubber skeleton (4) during primary injection molding, part of soft rubber melt flows into the grooves (44) during secondary injection molding, connecting columns (52) are formed on the back surface of the soft rubber coating layer (5), and the contact area of the hard rubber skeleton (4) and the soft rubber coating layer (5) is further increased through the plurality of connecting columns (52), so that the adhesion of the two is improved.
5. The injection mold for the two-color automobile armrests according to claim 1, wherein the left side and the right side of the armrests are of a back-off structure, the two sides are formed by adopting a front mold core pulling mode, a core pulling block parting surface is arranged between a front needle eye (51) and a rear needle eye (51), two glue injection channels are formed at the needle eyes (51), the channels are narrow and thin, and core pulling displacement is caused by punching caused by large injection pressure; in order to avoid core pulling displacement, core pulling anti-back components (6) are arranged on the primary injection front mold and the secondary injection front mold, and the core pulling anti-back components (6) comprise: the core pulling device comprises a core pulling block (61) arranged on a first injection front template or a second injection front template in a sliding manner, wherein a core pulling guide block (62) and an oil cylinder (63) are arranged on the outer side of the core pulling block (61), the oil cylinder (63) is vertically arranged, an oil cylinder rod is downwards connected with the core pulling guide block (62), a guide groove is arranged on the inner side surface of the core pulling guide block (62), the outer side end of the core pulling block (61) is in sliding connection with the guide groove, a guide block limit groove (14) is arranged on a rear template, the core pulling guide block (62) downwards moves to clamp the core pulling block (61) in place, and the lower end of the core pulling guide block (62) is inserted into the guide block limit groove (14).
6. The two-color automobile armrest injection mold according to claim 5, wherein the parting surfaces of the core pulling block (61) at the front side and the rear side are at the fillet molding surface change juncture when the core pulling block is clamped with the first injection cavity (2) or the second injection cavity (3), and after the second injection molding, the surface clamping line of the soft rubber coating layer (5) is arranged between the front needle eye (51) and the rear needle eye (51) and at the fillet molding surface change juncture of the side surfaces of the front needle eye and the rear needle eye (51).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311021382.1A CN116728716A (en) | 2023-08-15 | 2023-08-15 | Double-colored car handrail injection mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311021382.1A CN116728716A (en) | 2023-08-15 | 2023-08-15 | Double-colored car handrail injection mold |
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| CN116728716A true CN116728716A (en) | 2023-09-12 |
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| CN202311021382.1A Pending CN116728716A (en) | 2023-08-15 | 2023-08-15 | Double-colored car handrail injection mold |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN209207952U (en) * | 2018-11-01 | 2019-08-06 | 台州市欧威家具有限公司 | Core pulling positions retreating prevention mechanism |
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Application publication date: 20230912 |