CN106985348B - Mold core for manufacturing convex structure of inner wall of straight column type cavity and implementation method thereof - Google Patents

Mold core for manufacturing convex structure of inner wall of straight column type cavity and implementation method thereof Download PDF

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Publication number
CN106985348B
CN106985348B CN201710277101.7A CN201710277101A CN106985348B CN 106985348 B CN106985348 B CN 106985348B CN 201710277101 A CN201710277101 A CN 201710277101A CN 106985348 B CN106985348 B CN 106985348B
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grid
positioning
mold core
wall
core
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CN106985348A (en
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吴泽龙
章仲宇
梁政元
成思源
周金平
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • B29C45/2616—Moulds having annular mould cavities
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/76—Cores
    • 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
    • B29C45/36—Moulds having means for locating or centering cores
    • 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
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention discloses a mold core for manufacturing a convex structure on the inner wall of a straight column type cavity, which comprises grid bars, staggered interlocking convex bars, a grid bar pairing structure, a sealing platform, staggered interlocking grooves, a mold core middle structure, a sealing step and a positioning structure, wherein the staggered interlocking convex bars are arranged on the grid bars, and the grid bars are also provided with grooves for manufacturing the convex structure; the staggered interlocking grooves are arranged on the grid matching structure and matched with the staggered interlocking convex strips for use, and the sealing platform is arranged at the bottom of the grid matching structure; the invention can manufacture the convex structures with various shapes and various distribution positions of the inner wall of the straight column cavity body with any bottom edge profile; the mold core has simple structure and reasonable design, and can be produced in a large amount and efficiently.

Description

Mold core for manufacturing convex structure on inner wall of straight column type cavity and implementation method thereof
Technical Field
The invention relates to the technical field of injection molds, in particular to a mold core for manufacturing a convex structure on the inner wall of a straight column type cavity and an implementation method thereof.
Background
In the field of injection mold design, when a protruding structure on the inner wall of a straight-column cavity needs to be formed, the following methods are widely adopted at present: forced demolding or lifter, although they can function to some extent, each suffers from different drawbacks. Forced demoulding can be implemented only by using a material with certain elasticity, and the precision is not high; the inclined top is difficult to be applied when the cavity structure is small. Generally, the two methods cannot directly form the raised structure on the inner wall of the straight column cavity; and the 3D printing technology has the defects of poor comprehensive mechanical property, difficulty in batch production, high cost and the like.
In order to overcome the above-mentioned drawbacks of several methods for manufacturing the raised structure on the inner wall of the right-angled pillar cavity, a new type of core is proposed in the patent 201620607160.7: the invention relates to a mold core capable of manufacturing a convex structure on the inner wall of a cylindrical cavity, which solves the problems, but can only be used for processing and manufacturing the convex structure on the inner wall of the cylindrical cavity with a circular bottom edge profile, but not for processing and manufacturing the convex structure on the inner wall of the cylindrical cavity with a triangle, a quadrangle and other polygons, an oval shape and even a straight cylinder with an irregular bottom edge profile.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mold core for manufacturing a convex structure on the inner wall of a straight column type cavity, which can manufacture various shapes of the inner wall of the straight column type cavity with any bottom edge profile and can manufacture the convex structure at various distribution positions.
The invention also aims to provide a method for realizing the core for manufacturing the convex structure on the inner wall of the straight columnar cavity.
The purpose of the invention is realized by the following technical scheme:
a mold core for manufacturing a protruding structure on the inner wall of a straight column type cavity comprises grid bars, staggered interlocking convex bars, a grid bar pairing structure, a sealing table, staggered interlocking grooves, a mold core middle structure, sealing steps and a positioning structure, wherein the staggered interlocking convex bars are arranged on the grid bars, and the grid bars are also provided with grooves for manufacturing the protruding structure; the staggered interlocking grooves are formed in the grid pairing structure and matched with the staggered interlocking convex strips for use, and the sealing platform is arranged at the bottom of the grid pairing structure; the grid bars are positioned between the two grid bar matching structures, the staggered interlocking convex strips on the grid bars are inserted into the staggered interlocking grooves on the grid bar matching structures, the grid bars and the grid bar matching structures are matched with each other to form a combined structure, and the shape of the combined structure is matched with that of the inner wall of the straight column type cavity; the core middle structure is positioned in the middle of the combined structure, the sealing step is arranged at the bottom of the core middle structure, and the sealing step and the sealing platform are matched with each other to form a sealing step; the positioning structure is arranged on the combined structure and the core middle structure.
Preferably, the positioning structure includes a positioning hole, a positioning claw and a positioning column, the positioning hole is disposed on the grid mating structure, the positioning claw is disposed on the core middle structure, the positioning column is disposed on the positioning claw, the core middle structure is inserted into the combined structure, and the positioning column is inserted into the positioning hole, so as to fix the combined structure.
Preferably, the positioning structure comprises a clamping strip and a clamping groove, the clamping groove is arranged on the grid matching structure, the clamping strip is arranged on the core middle structure, the core middle structure is inserted into the combined structure, and the clamping strip is inserted into the clamping groove to fix the combined structure.
Preferably, the shape of the clamping strip is a diamond shape or a T shape, and the shape of the clamping groove matched with the clamping strip is also a diamond shape or a T shape correspondingly.
Preferably, the shape of the groove for manufacturing the convex structure is conical, truncated cone or cylindrical.
Preferably, the cross section of the cylindrical groove is circular, oval, heart-shaped or polygonal.
The method for realizing the core for manufacturing the raised structure on the inner wall of the straight cylindrical cavity body comprises the following steps:
step one, determining a bottom edge contour line of the whole mold core according to a bottom edge contour line of the inner wall of the straight column type cavity; determining the distribution and the number of the grid bars according to the projection distribution condition of the inner wall bulges of the straight column cavity to be manufactured on the bottom surface of the cavity; determining the position, depth and shape of a groove for manufacturing the protrusion on each grid according to the distribution position, insertion depth and shape of the protrusion on the inner wall of the straight column cavity body on each grid;
step two, installing a plurality of staggered interlocking convex strips on the grid bars, wherein the staggered interlocking convex strips on two adjacent grid bars are not interfered with each other; each grid bar is displaced along the direction of the bulge of the inner wall of the straight-column cavity to be manufactured, the displacement distance is the length of the bulge, then the upper bottom contour of the middle structure of the mold core is determined according to the projection of the displaced grid bar on the bottom of the mold core, and the contour comprises the projection of all the grid bars on the bottom of the mold core after displacement, so that after the middle structure of the mold core is removed, all the grid bars can be smoothly extracted by means of the space after the middle structure of the mold core is removed;
determining the shape of the grid matching structure according to the space formed by two adjacent grids, the middle structure of the mold core and the inner wall of the straight column cavity body; correspondingly arranging matched staggered interlocking grooves on the grid matching structure according to the shape and distribution condition of the staggered interlocking convex strips on the grid; arranging a sealing step at the bottom of the middle structure of the mold core, arranging a sealing platform at the bottom of the grid matching structure, and combining the sealing step and the sealing platform to form a sealing step; positioning structures are arranged on the grid matching structure and the mold core middle structure;
combining the grid bars, the grid bar matching structures, the core middle structure and the positioning structures to form a whole, wherein the grid bars and the grid bar matching structures are matched with each other to form a combined structure, the core middle structure is inserted into the combined structure, and meanwhile, the positioning structures on the core middle structure are correspondingly inserted into the positioning structures on the grid bar matching structures; then putting the integrated body formed by combination into a corresponding straight column type mould, injecting a molten injection molding material, and waiting for cooling and forming;
step five, after cooling and forming, drawing out the middle structure of the mold core, and simultaneously drawing out the positioning structure arranged on the middle structure of the mold core from the positioning structure on the grid matching structure;
step six, withdrawing each grid bar along the direction of the inner wall of the straight column cavity body in a protruding mode until the grid bar is withdrawn into a space left by withdrawing the middle structure of the mold core, and then taking out each grid bar;
and step seven, taking out the rest grid matching structures, and finally obtaining the straight-column cavity body with the inner wall convex structure to be manufactured.
Preferably, the positioning structure includes a positioning hole, a positioning claw and a positioning column, the positioning hole is disposed on the grid mating structure, the positioning claw is disposed on the core middle structure, the positioning column is disposed on the positioning claw, the core middle structure is inserted into the combined structure, and the positioning column is inserted into the positioning hole, so as to fix the combined structure.
Preferably, the positioning structure comprises a clamping strip and a clamping groove, the clamping groove is arranged on the grid matching structure, the clamping strip is arranged on the core middle structure, the core middle structure is inserted into the combined structure, and the clamping strip is inserted into the clamping groove to fix the combined structure.
Preferably, the shape of the clamping strip is a diamond shape or a T shape, and the shape of the clamping groove matched with the clamping strip is also a diamond shape or a T shape correspondingly.
The working principle of the invention is as follows:
firstly, determining the bottom edge contour line of the whole mold core according to the bottom edge contour line of the inner wall of the straight column type cavity; determining the distribution and the number of the grid bars according to the projection distribution condition of the inner wall bulges of the cavity of the straight column to be manufactured on the bottom surface of the cavity; determining the position, depth and shape of a groove for manufacturing the protrusion on each grid according to the distribution position, insertion depth and shape of the protrusion on the inner wall of the straight column cavity body on each grid; a plurality of staggered interlocking convex strips are arranged on the grid strips, and the staggered interlocking convex strips on two adjacent grid strips are not interfered with each other; displacing each grid along the protruding direction of the inner wall of the straight-column cavity to be manufactured, wherein the displacement distance is the protruding length, and then determining the upper bottom profile of the middle structure of the mold core according to the projection of the moved grid at the bottom of the mold core, wherein the profile comprises the projection of all the grids at the bottom of the mold core after displacement, so that after the middle structure of the mold core is removed, all the grids can be smoothly drawn out by means of the space of the removed middle structure of the mold core; determining the shape of a grid matching structure according to the space formed by two adjacent grids, the middle structure of the mold core and the inner wall of the straight column cavity body; correspondingly arranging matched staggered interlocking grooves on the grid pairing structure according to the shape and distribution condition of the staggered interlocking convex strips on the grid; arranging a sealing step at the bottom of the middle structure of the mold core, arranging a sealing platform at the bottom of the grid matching structure, and mutually combining the sealing step and the sealing platform to form a sealing step; positioning structures are arranged on the grid matching structure and the mold core middle structure; combining the grid bars, the grid bar matching structures, the mold core middle structures and the positioning structures into a whole, then placing the whole into a corresponding straight column mold cavity, injecting molten injection molding materials, and waiting for cooling and molding; after cooling and forming, drawing out the middle structure of the mold core, and simultaneously drawing out the positioning structure arranged on the middle structure of the mold core from the grid matching structure; displacing each grid bar along the direction of the bulge of the inner wall of the straight-column cavity to be manufactured until the grid bar is displaced into a space left by drawing out the middle structure of the mold core, and then taking out each grid bar; and taking out the rest grid matching structure to obtain the straight-column cavity with the inner wall convex structure to be manufactured.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention can manufacture the convex structures with various shapes and various distribution positions of the inner wall of the straight column cavity body with any bottom edge profile;
(2) The bottom of the mold core is provided with the sealing step structure which can play a role in sealing and prevent molten injection molding materials from entering the interior of the mold core;
(3) The core is provided with the staggered interlocking structure and the positioning structure, so that the core keeps firm integrity in the working process, and can be flexibly and gradually pulled away from the straight column cavity through the separating positioning structure and the staggered interlocking structure after the working is finished;
(4) The mold core disclosed by the invention is simple in structure, reasonable in design and capable of being produced in a large scale and efficiently.
Drawings
FIG. 1 is a schematic structural view of a grid according to the present invention;
FIG. 2 is a schematic structural diagram of a grid mating structure according to the present invention;
FIG. 3 is a schematic structural view of the mutual positions of the pair structures of the grid bars of the present invention;
FIG. 4 is a schematic view of the bottom seal step of the core center structure of the present invention;
FIG. 5 is a schematic view of the combination of the grid and the mating grid structure of the present invention.
FIG. 6 is a schematic view of the positioning pawl and positioning post of the core center structure of the present invention.
Fig. 7 is an exploded view of the positioning structure of the present invention having positioning holes, positioning claws and positioning posts.
FIG. 8 is a schematic structural diagram of the protrusion structure of the inner wall of the pillar-shaped cavity according to the present invention.
FIG. 9 is a schematic view of the structure of the clamping strip on the core middle structure of the invention.
FIG. 10 is a schematic view of the combination of the grid, grid mating structure and core center structure of the present invention.
Fig. 11 is an exploded view of the positioning structure of the present invention provided with the clip strips and the clip grooves.
The reference numbers in the figures are: 1. grid bars; 2. interlocking the raised strips in a staggered manner; 3. a grid pairing structure; 4. a sealing table; 5. staggered interlocking grooves; 6. a mold core middle structure; 7. a sealing step; 8. a groove for manufacturing a bump structure; 9. a positioning pawl; 10. a positioning column; 11. positioning holes; 12. clamping the strip; 13. a clamping groove.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in fig. 1 to 8, a mold core for manufacturing a protrusion structure on an inner wall of a right cylinder type cavity comprises a grid 1, a staggered interlocking convex strip 2, a grid pairing structure 3, a sealing platform 4, a staggered interlocking groove 5, a mold core middle structure 6, a sealing step 7 and a positioning structure, wherein the staggered interlocking convex strip 2 is arranged on the grid 1, the grid 1 is also provided with a groove 8 for manufacturing the protrusion structure, the groove 8 for manufacturing the protrusion structure is conical, truncated cone-shaped or cylindrical, and the cross section of the cylindrical groove is circular, elliptical, heart-shaped or polygonal; the staggered interlocking grooves 5 are formed in the grid mating structure 3, the staggered interlocking grooves 5 are matched with the staggered interlocking convex strips 2 for use, and the sealing table 4 is arranged at the bottom of the grid mating structure 3; the grid bars 1 are positioned between the two grid bar matching structures 3, the staggered interlocking convex strips 2 on the grid bars 1 are inserted into the staggered interlocking grooves 5 on the grid bar matching structures 3, the grid bars 1 and the grid bar matching structures 3 are mutually matched to form a combined structure, and the shape of the combined structure is matched with that of the inner wall of the straight columnar cavity; the core middle structure 6 is positioned in the middle of the combined structure, the sealing step 7 is arranged at the bottom of the core middle structure 6, the contour of the sealing step 7 is the lower bottom contour of the core middle structure 6, the contour of the core middle structure 6 above the sealing step 7 is the upper bottom contour of the core middle structure 6, and the sealing step 7 and the sealing table 4 are matched with each other to form a sealing table 4 step; the positioning structure is arranged on the combined structure and the core middle structure 6 and comprises a positioning hole 11, a positioning claw 9 and a positioning column 10, the positioning hole 11 is arranged on the grid pairing structure 3, the positioning claw 9 is arranged on the core middle structure 6, the positioning column 10 is arranged on the positioning claw 9, the core middle structure 6 is inserted into the combined structure, and meanwhile, the positioning column 10 is inserted into the positioning hole 11, so that the combined structure is fixed.
Specifically, a bottom contour line of the whole mold core is determined according to a bottom contour line of the inner wall of the straight column type cavity; determining the distribution and the number of the grid bars 1 according to the projection distribution condition of the inner wall bulges of the straight column cavity to be manufactured on the bottom surface of the cavity; determining the position, the depth and the shape of a groove for manufacturing a protrusion on each grid 1 according to the distribution position, the insertion depth and the shape of the protrusion on the inner wall of the straight column type cavity on each grid 1; a plurality of staggered interlocking convex strips 2 are arranged on the grid bars 1, and the staggered interlocking convex strips 2 on two adjacent grid bars 1 are not interfered with each other; displacing each grid 1 along the direction of the bulge of the inner wall of the straight-column cavity to be manufactured by the grid 1, wherein the displacement distance is the length of the bulge, and then determining the upper bottom contour of the core middle structure 6 according to the projection of the displaced grid 1 on the bottom of the core, wherein the contour comprises the projection of all the grids 1 on the bottom of the core after displacement, so that after the core middle structure 6 is removed, all the grids 1 can be smoothly extracted by means of the space of the core middle structure 6 after removal; determining the shape of a grid pairing structure 3 according to the space formed by two adjacent grids 1, a core middle structure 6 and the inner wall of the straight column cavity body; correspondingly, matched staggered interlocking grooves 5 are arranged on the grid mating structure 3 according to the shape and distribution condition of the staggered interlocking convex strips 2 on the grid 1; arranging a sealing step 7 at the bottom of the mold core middle structure 6, arranging a sealing table 4 at the bottom of the grid matching structure 3, and mutually combining the sealing step 7 and the sealing table 4 to form a sealing table 4 step; positioning structures are arranged on the grid matching structure 3 and the mold core middle structure 6; combining the grid bars 1, the grid bar matching structures 3, the mold core middle structure 6 and the positioning structure into a whole, then placing the whole into a corresponding straight-column cavity, injecting molten injection molding materials, and waiting for cooling and molding; after cooling and forming, drawing out the core middle structure 6, and simultaneously drawing out the positioning structure arranged on the core middle structure 6 from the grid mating structure 3; displacing each grid 1 along the direction of the bulge of the inner wall of the straight-column cavity to be manufactured until the grid 1 is displaced into a space left by drawing out the middle structure 6 of the mold core, and then taking out each grid 1; and taking out the rest grid matching structure 3 to finally obtain the straight-column cavity with the inner wall convex structure to be manufactured.
The invention can manufacture the convex structures with various shapes and various distribution positions of the inner wall of the straight column cavity body with any bottom edge profile; the bottom of the mold core is provided with a sealing step structure which can play a role in sealing and prevent molten injection molding materials from entering the interior of the mold core; the core is provided with the staggered interlocking structure and the positioning structure, so that the core keeps firm integrity in the working process, and can be flexibly and gradually pulled out of the straight column cavity by separating the positioning structure and the staggered interlocking structure after the working is finished; the mold core has simple structure and reasonable design, and can be produced in a large amount and efficiently.
Example 2
Fig. 9 to 11 show another positioning structure of the present invention, and the present embodiment is the same as example 1 except for the following features: the positioning structure comprises clamping strips 12 and clamping grooves 13, the clamping grooves 13 are arranged on the grid mating structure 3, the clamping strips 12 are arranged on the core middle structure 6, the core middle structure 6 is inserted into the combined structure, and the clamping strips 12 are inserted into the clamping grooves 13 at the same time, so that the combined structure is fixed; the shape of the clamping strip 12 is a diamond shape or a T shape, and the shape of the clamping groove 13 matched with the clamping strip 12 is also a diamond shape or a T shape correspondingly.
The present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.

Claims (10)

1. The mold core for manufacturing the convex structure on the inner wall of the straight column type cavity is characterized by comprising grid bars, staggered interlocking convex bars, a grid bar pairing structure, a sealing table, staggered interlocking grooves, a mold core middle structure, a sealing step and a positioning structure, wherein the staggered interlocking convex bars are arranged on the grid bars, and grooves for manufacturing the convex structure are also formed in the grid bars; the staggered interlocking grooves are arranged on the grid matching structure and matched with the staggered interlocking convex strips for use, and the sealing platform is arranged at the bottom of the grid matching structure; the grid bars are positioned between the two grid bar matching structures, the staggered interlocking convex strips on the grid bars are inserted into the staggered interlocking grooves on the grid bar matching structures, the grid bars and the grid bar matching structures are matched with each other to form a combined structure, and the shape of the combined structure is matched with that of the inner wall of the straight column type cavity; the core middle structure is positioned in the middle of the combined structure, the sealing step is arranged at the bottom of the core middle structure, and the sealing step and the sealing platform are matched with each other to form a sealing step; the positioning structure is arranged on the combined structure and the core middle structure.
2. The mold core for manufacturing the raised structure on the inner wall of the straight column type cavity according to claim 1, wherein the positioning structure comprises a positioning hole, a positioning claw and a positioning column, the positioning hole is arranged on the grid mating structure, the positioning claw is arranged on the mold core middle structure, the positioning column is arranged on the positioning claw, the mold core middle structure is inserted into the combined structure, and the positioning column is inserted into the positioning hole, so as to fix the combined structure.
3. The core for manufacturing the raised structure on the inner wall of the right cylinder type cavity according to claim 1, wherein the positioning structure comprises a clamping strip and a clamping groove, the clamping groove is arranged on the grid mating structure, the clamping strip is arranged on the core middle structure, the core middle structure is inserted into the combined structure, and the clamping strip is inserted into the clamping groove, so as to fix the combined structure.
4. The mold core for manufacturing the convex structure on the inner wall of the straight columnar cavity as claimed in claim 3, wherein the shape of the clamping strip is a diamond shape or a T shape, and the shape of the clamping groove matched with the clamping strip is a diamond shape or a T shape correspondingly.
5. The core for manufacturing the raised structure on the inner wall of the right-cylinder-shaped cavity according to claim 1, wherein the shape of the groove for manufacturing the raised structure is conical, truncated cone or cylindrical.
6. The core for manufacturing the convex structure on the inner wall of the straight cylindrical cavity according to claim 5, wherein the cross section of the cylindrical groove is circular, oval, heart-shaped or polygonal.
7. A method for realizing the core for manufacturing the raised structure on the inner wall of the right-cylinder cavity as claimed in any one of claims 1 to 6, is characterized by comprising the following steps:
step one, determining a bottom edge contour line of the whole mold core according to a bottom edge contour line of the inner wall of the straight column type cavity; determining the distribution and the number of the grid bars according to the projection distribution condition of the inner wall bulges of the cavity of the straight column to be manufactured on the bottom surface of the cavity; determining the position, depth and shape of a groove for manufacturing the protrusion on each grid according to the distribution position, insertion depth and shape of the protrusion on the inner wall of the straight column cavity body on each grid;
step two, installing a plurality of staggered interlocking convex strips on the grid bars, wherein the staggered interlocking convex strips on two adjacent grid bars are not interfered with each other; each grid bar is displaced along the direction of the bulge of the inner wall of the straight-column cavity to be manufactured, the displacement distance is the length of the bulge, then the upper bottom contour of the middle structure of the mold core is determined according to the projection of the displaced grid bar on the bottom of the mold core, and the contour comprises the projection of all the grid bars on the bottom of the mold core after displacement, so that after the middle structure of the mold core is removed, all the grid bars can be smoothly extracted by means of the space after the middle structure of the mold core is removed;
thirdly, determining the shape of the grid matching structure according to the space formed by two adjacent grids, the middle structure of the mold core and the inner wall of the straight column cavity body; correspondingly arranging matched staggered interlocking grooves on the grid pairing structure according to the shape and distribution condition of the staggered interlocking convex strips on the grid; arranging a sealing step at the bottom of the middle structure of the mold core, arranging a sealing platform at the bottom of the grid matching structure, and combining the sealing step and the sealing platform to form a sealing step; positioning structures are arranged on the grid matching structure and the mold core middle structure;
combining the grid bars, the grid bar matching structures, the core middle structure and the positioning structures to form a whole, wherein the grid bars and the grid bar matching structures are matched with each other to form a combined structure, the core middle structure is inserted into the combined structure, and meanwhile, the positioning structures on the core middle structure are correspondingly inserted into the positioning structures on the grid bar matching structures; then putting the integrated body formed by combination into a corresponding straight column type mould, injecting a molten injection molding material, and waiting for cooling and molding;
step five, after cooling and forming, drawing out the middle structure of the mold core, and simultaneously drawing out the positioning structure arranged on the middle structure of the mold core from the positioning structure on the grid matching structure;
step six, withdrawing each grid bar along the direction of the inner wall of the straight column cavity body in a protruding mode until the grid bar is withdrawn into a space left by withdrawing the middle structure of the mold core, and then taking out each grid bar;
and step seven, taking out the rest grid matching structures, and finally obtaining the straight-column cavity body with the inner wall convex structure to be manufactured.
8. The method as claimed in claim 7, wherein the positioning structure comprises a positioning hole, a positioning claw and a positioning post, the positioning hole is disposed on the grid mating structure, the positioning claw is disposed on the core middle structure, the positioning post is disposed on the positioning claw, the core middle structure is inserted into the combined structure, and the positioning post is inserted into the positioning hole, thereby fixing the combined structure.
9. The method as claimed in claim 7, wherein the positioning structure comprises a locking bar and a locking groove, the locking groove is disposed on the grid mating structure, the locking bar is disposed on the core middle structure, the core middle structure is inserted into the combined structure, and the locking bar is inserted into the locking groove to fix the combined structure.
10. The method for manufacturing the mold core with the raised structure on the inner wall of the straight column type cavity body as claimed in claim 9, wherein the shape of the clamping strip is a diamond shape or a T shape, and the shape of the clamping groove matched with the clamping strip is a diamond shape or a T shape correspondingly.
CN201710277101.7A 2017-04-25 2017-04-25 Mold core for manufacturing convex structure of inner wall of straight column type cavity and implementation method thereof Active CN106985348B (en)

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WO2013014952A1 (en) * 2011-07-22 2013-01-31 株式会社テクノクラーツ Undercut processing mechanism
CN106003491A (en) * 2016-06-16 2016-10-12 广东工业大学 Mold core for manufacturing bulge structures on inner wall of cylindrical cavity and implementation method thereof
CN206937830U (en) * 2017-04-25 2018-01-30 广东工业大学 A kind of core for manufacturing right cylinder cavity inwall bulge-structure

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WO2013014952A1 (en) * 2011-07-22 2013-01-31 株式会社テクノクラーツ Undercut processing mechanism
CN202399475U (en) * 2011-12-21 2012-08-29 厦门精卫模具有限公司 Structure of retractable internal thread core pulling mold
CN106003491A (en) * 2016-06-16 2016-10-12 广东工业大学 Mold core for manufacturing bulge structures on inner wall of cylindrical cavity and implementation method thereof
CN206937830U (en) * 2017-04-25 2018-01-30 广东工业大学 A kind of core for manufacturing right cylinder cavity inwall bulge-structure

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