CN109109273B

CN109109273B - Internal and external core-pulling type injection mold and internal core-pulling forming structure thereof

Info

Publication number: CN109109273B
Application number: CN201810910692.1A
Authority: CN
Inventors: 叶根林
Original assignee: Starway International Home Living Co ltd
Current assignee: Starway International Home Living Co ltd
Priority date: 2018-08-10
Filing date: 2018-08-10
Publication date: 2020-09-22
Anticipated expiration: 2038-08-10
Also published as: CN109109273A

Abstract

The invention discloses an internal and external core-pulling type injection mold and an internal core-pulling forming structure thereof, relating to the technical field of injection molds, and the key points of the technical scheme are as follows: the mold comprises a first movable mold, a molding rod, a driving rod and a first driving part, wherein a mounting groove is formed in the first movable mold, a mold core is mounted in the mounting groove, and the other end of the molding rod is connected to the first driving part; the driving rod one end is inserted in the core and this tip is provided with the face of leading to one side, leads the face orientation to one side and deviates from first movable mould one side to one side, and the driving rod other end links to each other with first drive division, is equipped with shaping piece and elastic drive spare in the core, and elastic drive spare is used for pulling the shaping piece and laminates in the face of leading to one side all the time, and first drive division is used for driving shaping pole, actuating rod toward deviating from or being close to core one side and removes. The whole volume of the internal core-pulling forming structure is greatly reduced by the structure, the structure is ingenious, the compactness is high, and compared with the traditional complex core-pulling structure, the manufacturing cost is greatly reduced.

Description

Internal and external core-pulling type injection mold and internal core-pulling forming structure thereof

Technical Field

The invention relates to the technical field of injection molds, in particular to an internal and external core-pulling type injection mold and an internal core-pulling forming structure thereof

Background

An injection mold is a tool for producing plastic articles and also for giving the plastic articles a complete structure and precise dimensions.

A traditional injection mold structure for moulding plastics square seat product divide into cover half and movable mould usually, is provided with the runner on the cover half, and the die joint between cover half and the movable mould can be located the middle part position of seat.

Referring to fig. 1, the product is a seating surface inside a plastic chair, which is generally square in overall shape for seating the buttocks of a user.

Considering the installation stability of the two front chair legs, an inserting hole f is formed in the lower side of the chair surface, a fastening hole g is formed in the hole wall of the inserting hole f, the front chair leg is inserted into the inserting hole f, and a bolt penetrates through the fastening hole g and is connected into the front chair leg in a threaded mode; in order to increase the integrity of the outer shape of the seat, the insertion hole f is formed toward the middle of the seat.

The traditional injection mold for forming corresponding products generally adopts a side core pulling mechanism, and for the structure of the chair surface, the mold is difficult in design, the fastening hole g faces the middle direction of the chair surface, the characteristic of the fastening hole g needs to be formed, a more complex core pulling structure is inevitably designed, and the complex core pulling mechanism is high in manufacturing cost.

Disclosure of Invention

Aiming at the defects in the prior art, the first purpose of the invention is to provide an internal core-pulling forming structure which is high in structure compactness and low in manufacturing cost.

The technical purpose of the invention is realized by the following technical scheme: an internal core-pulling forming structure comprises a first movable die, a forming rod, a driving rod and a first driving part, wherein a mounting groove is formed in the first movable die, a core is mounted in the mounting groove, a forming cavity for forming a chair seat is formed between the outer side wall of the core and the wall of the mounting groove, one end of the forming rod extends into the forming cavity and is used for forming an inserting hole, and the other end of the forming rod is connected to the first driving part;

one end of the driving rod is inserted into the core, the end part of the driving rod is provided with an inclined guide surface, the inclined guide surface faces to the side away from the first movable die, the other end of the driving rod is connected with the first driving part, the core is internally provided with a forming block and an elastic driving part, one end of the forming block is opposite to the wall of the forming rod and is used for forming a fastening hole, the elastic driving part is used for pulling the forming block to be always attached to the inclined guide surface, and the forming block can move towards the side close to or far away from the forming rod;

the first driving part is used for driving the forming rod and the driving rod to move away from or close to one side of the mold core.

According to the technical scheme, after the seat is injection molded in the molding cavity, the first driving part can drive the molding rod to move relative to one side away from the mold core, and at the moment, the molding rod positioned in the molding cavity can form the inserting hole; meanwhile, the first driving part can drive the driving rod to move relative to one side, away from the core, under the elastic driving action of the elastic driving part, the forming block is attached to the inclined guide surface, the inclined guide surface faces the side, away from the first movable die, and when the driving rod moves, the forming block can move towards one side, close to the center of the core, so that the fastening hole is formed correspondingly; among the above-mentioned structure, all set up shaping piece and elastic drive spare in the die core, can reduce the whole volume of interior shaping structure of loosing core by a wide margin, the structure is ingenious, and the compactness is high, compares in traditional complicated structure of loosing core, and manufacturing cost reduces by a wide margin.

Preferably, still include the capping, be equipped with the holding tank on the core, the actuating lever end that has the oblique guide surface, elastic drive spare, shaping piece all are located the holding tank, the capping is installed in the notch department of holding tank, the outer lid wall and the core lateral wall of capping constitute complete plane.

Through above-mentioned technical scheme, wearing and tearing appear in actuating lever, elastic drive spare, the shaping piece in the holding tank to when needing to be changed, can open the capping, and then direct parts to correspond dismantle the maintenance can, change convenient assembling.

Preferably, the elastic driving part comprises a driving bolt and a driving spring, the thread end of the driving bolt penetrates through the groove cover and is in threaded connection with the forming block, the driving spring is connected between the driving bolt and the side wall of the groove cover, and the elastic force of the driving spring is used for driving the forming block to be always attached to the inclined guide surface.

Through above-mentioned technical scheme, driving spring's elasticity can be applyed in the shaping piece to provide the shaping piece and laminate all the time in the elastic extrusion force of oblique leading face, simple structure, and enable the shaping piece and slide action of leading the face to one side more smoothly, injection moulding's fastening hole quality is better.

The second purpose of the invention is to provide an internal and external core-pulling type injection mold which has simple structure, high compactness and low manufacturing cost.

The technical purpose of the invention is realized by the following technical scheme: an internal and external core-pulling injection mold comprises a first forming mold, wherein the first forming mold comprises a first fixed mold, the first fixed mold and a first movable mold can be matched or separated with each other, the internal core-pulling forming structure comprises an external core-pulling structure, the first movable mold comprises a first mold base, a first-stage mold plate and a second-stage mold plate, the first-stage mold plate and the second-stage mold plate are in a state of being fixed relative to the first mold base, the first movable mold plate and the second-stage mold plate are in a state of being movable relative to the first mold base, the external core-pulling structure comprises a sliding base and an inclined guide post, the sliding base is connected to the second-stage mold plate in a sliding manner, one end of the inclined guide post is connected to the first-stage mold plate, the other end of the;

and the first movable die is provided with an ejector pin plate group, and the ejector pin plate group is used for driving the second-stage template to be close to or far away from the first-stage template.

According to the technical scheme, after the chair seat is formed in the forming cavity, the inner core-pulling forming structure acts to form the characteristics of the inserting hole and the fastening hole; meanwhile, the outward core-pulling forming structure can also perform synchronous action, namely the ejector pin plate group drives the second-stage template to move towards the direction away from the first-stage template, the inclined guide post moves relative to the second-stage template, the inclined guide post can drive the sliding seat to slide, and one end, close to the forming cavity, of the sliding seat can correspondingly form an arc-shaped notch and a fixing hole in injection molding; in the structure, two injection molding modes of an inner core-pulling mode and an outer core-pulling mode are utilized in the same pair of molds, on one hand, the core-pulling structure is compact, the size of the mold is reduced to the maximum degree, and on the other hand, the quality of the chair seat formed by injection molding is higher.

Preferably, install the fixing base on the second grade template, the seat that slides connect in on the fixing base, the seat that slides is close to the one end of core and is equipped with the draw-in groove, the card inlays in the draw-in groove and has the fixture block, the fixture block deviates from the tip that is close to the core and is used for shaping arc notch and fixed orifices.

Through above-mentioned technical scheme, the seat that slides is connected on the second grade template through the fixing base slides, when producing wearing and tearing between sliding block and the fixing base, can directly through maintenance fixing base and the seat that slides can, and can not involve maintenance second grade template, reduced later stage cost of maintenance.

Preferably, the clamping device further comprises a pressing plate and a pressing bolt, the pressing bolt penetrates through the pressing plate and is in threaded connection with the fixing seat, and the pressing plate is used for pressing the clamping block in the clamping groove.

Through the technical scheme, firstly, arc-shaped notches and fixing holes in different shapes can be formed by replacing clamping blocks in different shapes; secondly, when the fixture block is worn, the fixture block can be correspondingly replaced by disassembling the compression bolt.

Preferably, still include main mount pad, second forming die, the second forming die includes second movable mould and second cover half, first movable mould and second movable mould are all installed on main mount pad, be equipped with first die cavity on the first cover half, be equipped with the second die cavity on the second cover half, the cavity degree of depth of first die cavity is less than the cavity degree of depth of second die cavity.

According to the technical scheme, the first movable die is arranged on a rotating disk of the injection molding machine, and in the actual use process, the first cavity is injected with the first layer of molten plastic, so that a chair seat with the contour consistent with that of the first cavity is formed; then, the first movable die is separated from the first fixed die, the first movable die rotates 180 degrees along with the rotating disc, the first movable die and the first fixed die are mutually matched, the second cavity is formed on the chair seat formed at the first time, and because the depth of the cavity of the first cavity is lower than that of the second cavity, molten plastic melt is injected into the second cavity, and then another surface layer can be formed on the chair seat; thereby forming the bicolor chair seat.

Preferably, the ejector pin plate group comprises a first-stage ejector plate and a second-stage ejector plate, and the first-stage ejector plate is connected with the second-stage template through a first fixing column;

the mold core is connected with the primary template and is positioned in the secondary template;

the second-level top plate is connected with a second fixing column, an end portion, deviating from the second-level top plate, of the second fixing column is provided with a top block, the top block is located in the forming cavity, and the top block is used for abutting against the edge position of the chair seat which is formed through injection molding.

According to the technical scheme, in the process of jacking the whole chair surface, a secondary jacking mode is adopted, namely the first-stage top plate moves towards the first fixed die direction firstly, the first-stage top plate pushes the second-stage template through the first fixed die, the second-stage template can jack up the chair surface in the forming cavity for the first time, and the chair surface can be separated from the mold core preliminarily; then, the second-level top plate moves towards the first fixing column direction, the second-level top plate jacks up the jacking block through the second fixing column, and the jacking block pushes the chair surface to carry out secondary ejection; after the secondary ejection, the chair seat can be thoroughly separated from the mold core, and the demolding effect is good.

Preferably, the first-stage template is provided with a first locking piece, the second-stage template is provided with a second locking piece, and the first locking piece and the second locking piece are buckled with each other to improve the die assembly stability of the first locking piece and the second locking piece;

when the second-level template is driven by the first-level top plate, the first locking piece is separated from the second locking piece.

Through the technical scheme, when the primary template and the secondary template are mutually attached, the first locking piece and the second locking piece are mutually buckled to improve the die closing stability between the primary template and the secondary template; when the first-stage template is separated from the second-stage template, the first locking piece and the second locking piece are separated from each other by using the pulling force between the first-stage template and the second-stage template; the process can greatly improve the stability of the mold opening and closing between the first-level template and the second-level template.

Preferably, be equipped with the runner on the first fixed die, be equipped with in the runner and water the piece, water the piece and be equipped with in the piece and water the passageway of pouring, water passageway one end of pouring and be used for the butt joint mouth of moulding plastics, water the passageway other end of pouring and just to the shaping chamber, water the passageway of pouring and be close to in the shaping chamber be equipped with pneumatic needle valve, pneumatic needle valve is used for controlling the inside of pouring the passageway and opens and close.

According to the technical scheme, when injection molding operation is required, the injection nozzle of the injection molding machine is inserted into the injection channel, the pneumatic needle valve is controlled by the air source to be in an open state, plastic liquid in a melting state enters the corresponding forming cavity through the pneumatic needle valve, and after the injection molding is finished, the pneumatic needle valve is closed; at the moment, because the pneumatic needle valve is positioned at the position of the injection channel close to the molding cavity, when the pneumatic needle valve is closed, the injection molding sprue of the chair surface can be automatically removed, and the subsequent sprue removing step is not required to be arranged.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. the mode of combining the inner core-pulling structure and the outer core-pulling structure is adopted, so that the integral mold is high in structural compactness and low in manufacturing cost while the injection molding quality of the chair seat is guaranteed;

2. the double-color rotary injection molding can be used for injection molding of a high-quality double-color chair back;

3. the needle valve type pouring gate is adopted, so that the trouble of removing the pouring gate subsequently is avoided, and the labor cost is saved;

4. by adopting a three-plate mold secondary parting mode, the chair seat can be ejected more smoothly, and the molding quality is higher.

Drawings

FIG. 1 is a schematic view of a first angle structure of a chair seat to be injection molded, which is used for displaying the structures of fastening holes and insertion holes;

FIG. 2 is a schematic diagram of a second angular structure of a chair seat to be injection molded, which is used for mainly showing the structures of the arc-shaped notch and the fixing hole;

fig. 3 is a schematic view of an installation structure in the first embodiment, which is used for mainly showing an installation position of an internal core-pulling molding structure;

FIG. 4 is an exploded view of the structure of the embodiment, with emphasis on showing the internal components of the embodiment;

FIG. 5 is a schematic sectional view of the embodiment, which is used to highlight the internal fitting situation of the embodiment;

FIG. 6 is a schematic structural view of the second embodiment, which is used for highlighting the installation position of the external core-pulling structure;

fig. 7 is an exploded view of the structure of the outer core pulling structure in the second embodiment, which is used for mainly showing the internal components of the outer core pulling structure;

fig. 8 is a cross-sectional view of the outer core pulling structure in the second embodiment, which is used for mainly showing the internal matching relationship of the outer core pulling structure;

fig. 9 is a schematic structural view of a second embodiment, which is used for focusing on the depth ratio of the first cavity and the second cavity in the second embodiment;

FIG. 10 is a schematic view of a partial structure of the second embodiment, which is used to show the connection relationship between the thimble plate set and the first fixed mold;

FIG. 11 is a schematic structural diagram of a casting member for highlighting a positional connection relationship between a casting channel and a pneumatic needle valve;

fig. 12 is an internal cross-sectional view of the third embodiment, which is used to highlight the internal structure of the third embodiment.

Reference numerals: a. a main chair plate; b. a sub-chair plate; c. an arc-shaped notch; e. a fixing hole; f. inserting holes; g. a fastening hole;

1. a first molding die; 2. a first stationary mold; 3. a first movable mold; 4. mounting grooves; 5. a core; 6. a molding cavity; 7. a thimble plate group; 8. forming a rod; 9. an internal core-pulling structure; 10. a drive rod; 11. an inclined guide surface; 12. forming a block; 13. an elastic driving member; 131. a drive spring; 132. a drive bolt; 14. a first die holder; 15. a first-level template; 16. a secondary template; 17. an external core-pulling structure; 18. a sliding seat; 19. an inclined guide post; 20. a slot cover; 21. accommodating grooves; 22. a main mounting base; 23. a second molding die; 24. a second movable mold; 25. a second stationary mold; 26. a first cavity; 27. a second cavity; 28. a first-level top plate; 29. a secondary roof plate; 30. a first fixed column; 31. a second fixed column; 32. a top block; 33. a first locking member; 34. a second locking member; 35. a gate; 36. pouring a casting piece; 37. pouring a channel; 38. a pneumatic needle valve; 39. a fixed seat; 40. a card slot; 41. a clamping block; 42. a compression plate; 43. a hold-down bolt; 44. a first driving section; 45. a first convex column; 46. an arc-shaped bulge; 47. a second convex column; 48. a trough body; 49. an elastic air bag; 50. an air blowing channel; 51. a one-way air outlet valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the chair seat to be injection molded is generally square, and is divided into a main chair plate a and an auxiliary chair plate b attached to the side wall of the main chair plate a, two adjacent corners of the chair seat are provided with plug-in holes f, and the hole wall of the plug-in hole f is provided with fastening holes g; the front chair leg is inserted into the inserting hole f, and the bolt penetrates through the fastening hole g and is connected into the front chair leg in a threaded mode. Referring to fig. 2, arc-shaped notches c are respectively arranged on the other two adjacent corners of the square chair seat, and at least two first fixing holes e are arranged in the arc-shaped notches c; during later stage installation, the rear chair leg corresponds and is embedded into in the middle of the arc notch c, and the bolt passes rear chair leg, first fixed orifices e in proper order and then realizes fixing the rear chair leg.

The first embodiment is as follows:

an internal core-pulling forming structure is used for forming a plug-in hole f and a fastening hole g of a chair seat in the figure 1, and the internal core-pulling forming structure is shown in the figure 3 and comprises a first movable die 3, wherein a mounting groove 4 is formed in the first movable die 3, a core 5 is mounted in the mounting groove 4, a forming cavity 6 is formed between the outer side wall of the core 5 and the groove wall of the mounting groove 4, the forming cavity 6 is used for forming the chair seat in the figures 1 and 2, and the internal core-pulling forming structure is mounted in the core 5.

Referring to fig. 3 and 4, the internal core pulling forming structure includes a forming rod 8, a driving rod 10, and a first driving portion 44, wherein one end of the forming rod 8 extends into the forming cavity 6 and is used for forming the inserting hole f, and the other end of the forming rod 8 is connected to the first driving portion 44. One end of the driving rod 10 is inserted into the core 5, the end portion of the driving rod is provided with an inclined guide surface 11, the inclined guide surface 11 faces away from one side of the first movable die 3, the other end of the driving rod 10 is connected with the first driving portion 44, a forming block 12 and an elastic driving piece 13 are arranged in the core 5, one end of the forming block 12 is provided with a first convex column 45 used for forming the fastening hole g, and the first convex column 45 is opposite to the rod wall of the forming rod 8. The elastic driving part 13 is used for pulling the forming block 12 to be always attached to the inclined guide surface 11, and the forming block 12 can move towards one side close to or far away from the forming rod 8. The first driving portion 44 is used for driving the forming rod 8 and the driving rod 10 to move away from or close to the side of the core 5.

Referring to fig. 3 and 4, a receiving groove 21 is formed in the core 5, a rod end of the driving rod 10 with the inclined guide surface 11, an elastic driving part 13 and a forming block 12 are arranged in the receiving groove 21, a groove cover 20 is covered at a groove opening of the receiving groove 21, the groove cover 20 is installed at the groove opening of the receiving groove 21, and an outer cover wall of the groove cover 20 and an outer side wall of the core 5 form a complete plane.

Referring to fig. 4 and 5, the elastic driving member 13 includes a driving bolt 132 and a driving spring 131, a threaded end of the driving bolt 132 penetrates through the slot cover 20 and is threadedly connected to the forming block 12, the driving spring 131 is connected between the driving bolt 132 and a side wall of the slot cover 20, and an elastic force of the driving spring 131 is used for driving the forming block 12 to be always attached to the inclined guide surface 11.

In the actual core-pulling forming process:

the chair seat is injection molded in the molding cavity 6 of the core 5, the first driving part 44 can simultaneously pull the molding rod 8 and the driving rod 10 to move, and the end part of the molding rod 8 is pulled out of the molded chair seat; the elastic force of the driving spring 131 is applied to the driving bolt 132, the forming block 12 is always attached to the inclined guide surface 11, and the driving bolt 132 pulls the forming block 12 to move towards the middle position of the mold core 5 along the inclined guide surface 11, so that the inserting hole f and the fastening hole g are formed in the upper side of the seat surface in a drawing mode.

Example two:

an internal and external core-pulling injection mold is used for injection molding of a chair seat shown in figures 1 and 2.

Referring to fig. 3 and fig. 6, the structure includes a first molding die 1, where the first molding die 1 includes a first fixed die 2, and the first fixed die 2 and the first movable die 3 can be matched or separated from each other, and include an outer core-pulling structure 17, such as an inner core-pulling molding structure in the first embodiment.

Referring to fig. 6 and 7, the first movable die 3 includes a first die holder 14, a first-stage die plate 15 in a fixed state relative to the first die holder 14, and a second-stage die plate 16 in a movable state relative to the first die holder 14, the core drawing structure 17 includes a sliding seat 18 and an inclined guide post 19, the sliding seat 18 is slidably connected to the second-stage die plate 16, one end of the inclined guide post 19 is connected to the first-stage die plate 15, and the other end of the inclined guide post 19 obliquely penetrates through the sliding seat 18 and is used for driving the sliding seat 18 to slide transversely; the first movable die 3 is provided with an ejector pin plate group 7, and the ejector pin plate group 7 is used for driving the second-level template 16 to be close to or far away from the first-level template 15.

Referring to fig. 2 and 7, an arc protrusion 46 is disposed at one end of the sliding seat 18 close to the molding cavity 6, the arc protrusion 46 is used for molding an arc notch c, two second protruding columns 47 are disposed on the arc protrusion 46, and the second protruding columns 47 are used for molding a fixing hole e.

Referring to fig. 6 and 7, a fixed seat 39 is mounted on the secondary formwork 16, and the sliding seat 18 is connected to the fixed seat 39 in a sliding manner. Referring to fig. 7 and 8, a clamping groove 40 is formed in one end of the sliding seat 18 close to the mold core 5, a clamping block 41 is embedded in the clamping groove 40, a pressing plate 42 and a pressing bolt 43 are arranged on the clamping block 41, the pressing bolt 43 penetrates through the pressing plate 42 and is in threaded connection with the fixed seat 39, and the pressing plate 42 is used for pressing the clamping block 41 in the clamping groove 40. The arc-shaped protrusion 46 and the second convex column 47 are both located at the end of the fixture block 41 close to the core 5.

Referring to fig. 9, the die further includes a main mounting seat 22 and a second molding die 23, the second molding die 23 includes a second movable die 24 and a second fixed die 25, the first movable die 3 and the second movable die 24 are both mounted on the main mounting seat 22, the first fixed die 2 is provided with a first cavity 26, the second fixed die 25 is provided with a second cavity 27, the first cavity 26 and the second cavity 27 have the same internal shape, the cavity depth of the first cavity 26 is a, the cavity depth of the second cavity 27 is B, and a is less than B.

Referring to fig. 10, the ejector pin plate group 7 includes a first-stage top plate 28 and a second-stage top plate 29, the first-stage top plate 28 is connected with the second-stage mold plate 16 through a first fixing column 30, the mold core 5 is connected with the first-stage mold plate 15, and the mold core 5 is located in the second-stage mold plate 16; the second-level top plate 29 is connected with a second fixing column 31, an end part, deviating from the second-level top plate 29, of the second fixing column 31 is provided with a top block 32, and the top block 32 is used for abutting against the edge position of the chair seat which is subjected to injection molding.

The first-stage template 15 is provided with a first locking piece 33, the second-stage template 16 is provided with a second locking piece 34, and the first locking piece 33 and the second locking piece 34 are buckled with each other to improve the mold closing stability of the first locking piece and the second locking piece; when the secondary template 16 is driven by the primary top plate 28, the first locking member 33 is disengaged from the second locking member 34.

Referring to fig. 6 and 11, a gate 35 is arranged on the first fixed die 2, a pouring member 36 is arranged in the gate 35, a pouring channel 37 is arranged in the pouring member 36, one end of the pouring channel 37 is used for abutting against an injection nozzle, the other end of the pouring channel 37 faces the molding cavity 6, the pouring channel 37 is provided with a pneumatic needle valve 38 close to the molding cavity 6, the pneumatic needle valve 38 is connected with an external air source, and the external air source supplies air to the pneumatic needle valve 38 to control the opening and closing of the inside of the pouring channel 37.

And (3) injection molding process: installing a first fixed die 2 and a second fixed die 25 on a fixedly arranged injection molding machine installation plate, installing a first movable die 3 on the injection molding machine installation plate capable of rotating circumferentially, mutually assembling the first fixed die 2 and the first movable die 3, simultaneously assembling the second fixed die 25 and a second movable die 24, inserting an injection nozzle of the injection molding machine into an injection channel 37 of an injection piece 36 corresponding to the first fixed die 2, supplying air to a pneumatic needle valve 38 by an external air source, opening the injection channel 37 by the pneumatic needle valve 38, injecting molten plastic melt into a molding cavity 6 corresponding to a first cavity 26 by the injection nozzle, supplying air to the pneumatic needle valve 38 by the external air source after the injection molding is finished, closing the injection channel 37 by the pneumatic needle valve 38, and not forming a sub-chair plate b on a chair surface; then, the first fixed die 2 and the second fixed die 25, the first movable die 3 and the second movable die 24 are separated from each other, the first movable die 3 and the second movable die 24 are rotated by 180 degrees, the injection nozzle is inserted into the opening 37 of the injection channel of the injection piece 36 corresponding to the second fixed die 25, the external air source supplies air to the pneumatic needle valve 38, the pneumatic needle valve 38 opens the injection channel 37, the injection nozzle injects the melted plastic melt into the molding cavity 6 corresponding to the second cavity 27, after the injection molding is completed, the external air source supplies air to the pneumatic needle valve 38, the pneumatic needle valve 38 closes the injection channel 37, and the auxiliary chair plate b is molded on the side wall of the main chair plate a.

Core-pulling forming process: the seat surface is formed in the molding cavity 6, the first fixed die 2 is separated from the first movable die 3, and the second fixed die 25 is separated from the second movable die 24. For the internal core-pulling structure 9, the first driving portion 44 simultaneously pulls the forming rod 8 and the driving rod 10 to the side away from the first fixing mold 2, the end portion of the forming rod 8 is pulled out from the main seat a, the forming block 12 can slide along the inclined guide surface 11, and the first protruding pillar 45 at the end portion of the forming block 12 is pulled out from the seat. For the outward drawing core structure 17, the first-level top plate 28 jacks up the second-level mold plate 16 through the first fixing post 30, the first locking member 33 and the second locking member 34 are separated from each other, the fixing seat 39 on the second-level mold plate 16 moves along with the first-level top plate, the inclined guide post 19 drives the sliding seat 18 to slide along the fixing seat 39, and the second protruding post 47 and the arc-shaped protrusion 46 at the end of the fixture block 41 can be separated from the formed seat.

The material demoulding process: the first-level top plate 28 jacks up the second-level template 16 through the first fixing post 30, the second-level template 16 can primarily separate the formed chair seat from the mold core 5, and then the second-level top plate 29 jacks up the chair seat from the mold core 5 through the second fixing post 31 by the jack 32 at the end of the second fixing post 31 for the second time, so as to achieve the purpose of thorough demolding.

Example three: the difference from the first embodiment and the second embodiment is that referring to fig. 12, a slot body 48 is arranged in the slot cover 20, the end of the driving bolt 132 departing from the forming block 12 is located in the slot body 48, the driving spring 131 is located in the slot body 48, an elastic air bag 49 is further arranged in the slot body 48, the end of the driving bolt 132 departing from the forming block 12 can generate extrusion force on the elastic air bag 49, the overall volume of the elastic air bag 49 can be reduced, and when the elastic air bag 49 is not subjected to the extrusion force, the original shape can be restored; an air blowing channel 50 is arranged on the slot cover 20, one end of the air blowing channel 50 is butted with the inside of the elastic air bag 49, the other end of the air blowing channel 50 faces the first convex column 45, and a one-way air outlet valve 51 is arranged at the opening part of the air blowing channel 50 close to the first convex column 45.

When the forming block 12 moves towards the side departing from the forming cavity 6, the end of the driving bolt 132 extrudes the elastic air bag 49, air in the elastic air bag 49 is blown out through the air blowing channel 50 and blown to the first convex column 45 through the one-way air outlet valve 51 so as to generate an air cooling effect on the fastening hole g of the chair seat and the first convex column 45, and the forming quality of the fastening hole g of the chair seat and the actual service life of the first convex column 45 are improved; when the forming block 12 moves toward the side close to the forming cavity 6, the elastic air bag 49 restores itself to its original volume shape.

The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.

Claims

1. The utility model provides an interior molding structure of loosing core, includes first movable mould (3), be equipped with mounting groove (4) on first movable mould (3), install core (5) in mounting groove (4), form between core (5) lateral wall and mounting groove (4) cell wall and be used for shaping become die cavity (6), characterized by of chair face: the device is characterized by further comprising a forming rod (8), a driving rod (10) and a first driving part (44), wherein one end of the forming rod (8) extends into the forming cavity (6) and is used for forming the inserting hole (f), and the other end of the forming rod (8) is connected to the first driving part (44);

one end of the driving rod (10) is inserted into the core (5), the end part, located in the core (5), of the driving rod (10) is provided with an inclined guide surface (11), the inclined guide surface (11) faces the side away from the first movable die (3), the other end of the driving rod (10) is connected with the first driving part (44), a forming block (12) and an elastic driving part (13) are arranged in the core (5), one end of the forming block (12) is opposite to the rod wall of the forming rod (8) and is used for forming a fastening hole (g), the elastic driving part (13) is used for pulling the forming block (12) to be attached to the inclined guide surface (11) all the time, and the forming block (12) can move towards one side close to or far away from one side of the forming rod (8);

the first driving part (44) is used for driving the forming rod (8) and the driving rod (10) to move towards one side of the mold core (5) away from or close to the mold core.

2. The internal core pulling molding structure according to claim 1, wherein: still include capping (20), be equipped with holding tank (21) on core (5), actuating lever (10) rod end, elastic drive spare (13), shaping piece (12) that have oblique guide surface (11) all are located holding tank (21), mounting in the notch department of holding tank (21) capping (20), the enclosing cover wall and core (5) lateral wall of capping (20) constitute complete plane.

3. The internal core pulling molding structure according to claim 2, wherein: the elastic driving piece (13) comprises a driving bolt (132) and a driving spring (131), the thread end of the driving bolt (132) penetrates through the groove cover (20) and is in threaded connection with the forming block (12), the driving spring (131) is connected between the driving bolt (132) and the side wall of the groove cover (20), and the elastic force of the driving spring (131) is used for driving the forming block (12) to be always attached to the inclined guide surface (11).

4. The utility model provides an inside and outside injection mold of loosing core, includes first forming die (1), first forming die (1) includes first cover half (2), and first cover half (2) and first movable mould (3) can be compound die each other or divide mould, characterized by: the inner core-pulling forming structure comprises an outer core-pulling structure (17) and the inner core-pulling forming structure according to any one of claims 1 to 3, wherein the first movable die (3) comprises a first die holder (14), a first-stage die plate (15) in a state of being fixed relative to the first die holder (14), and a second-stage die plate (16) in a state of being movable relative to the first die holder (14), the outer core-pulling structure (17) comprises a sliding seat (18) and an inclined guide post (19), the sliding seat (18) is connected to the second-stage die plate (16) in a sliding manner, one end of the inclined guide post (19) is connected to the first-stage die plate (15), the other end of the inclined guide post (19) penetrates through the sliding seat (18) in an inclined manner and is used for driving the sliding seat (18) to slide transversely, and one end, close to a forming cavity (6;

the first movable die (3) is provided with an ejector pin plate group (7), and the ejector pin plate group (7) is used for driving the second-stage template (16) to be close to or far away from the first-stage template (15).

5. The inside and outside loose core injection mold according to claim 4, characterized in that: install fixing base (39) on second grade template (16), slide seat (18) slide connect in on fixing base (39), the one end that slide seat (18) are close to core (5) is equipped with draw-in groove (40), the card has fixture block (41) in draw-in groove (40), fixture block (41) deviate from the tip that is close to core (5) and are used for shaping arc notch (c) and fixed orifices (e).

6. The inside and outside loose core injection mold according to claim 5, characterized in that: the clamping device is characterized by further comprising a pressing plate (42) and a pressing bolt (43), wherein the pressing bolt (43) penetrates through the pressing plate (42) and is in threaded connection with the fixing seat (39), and the pressing plate (42) is used for pressing the clamping block (41) into the clamping groove (40).

7. The inside and outside loose core injection mold according to claim 4, characterized in that: still include main mount pad (22), second forming die (23) include second movable mould (24) and second cover half (25), first movable mould (3) and second movable mould (24) are all installed on main mount pad (22), be equipped with first die cavity (26) on first cover half (2), be equipped with second die cavity (27) on second cover half (25), first die cavity (26) cavity degree of depth is less than the cavity degree of depth of second die cavity (27).

8. The inside and outside loose core injection mold according to claim 4, characterized in that: the ejector pin plate group (7) comprises a first-stage ejector plate (28) and a second-stage ejector plate (29), and the first-stage ejector plate (28) is connected with the second-stage template (16) through a first fixing column (30);

the core (5) is connected with the primary template (15) and the core (5) is positioned in the secondary template (16);

the two-stage top plate (29) is connected with a second fixing column (31), an end part, deviating from the two-stage top plate (29), of the second fixing column (31) is provided with a top block (32), the top block (32) is located in the forming cavity (6), and the top block (32) is used for abutting against the edge position of the seat surface which is subjected to injection molding.

9. The inside and outside loose core injection mold according to claim 8, characterized in that: a first locking piece (33) is arranged on the first-stage template (15), a second locking piece (34) is arranged on the second-stage template (16), and the first locking piece (33) and the second locking piece (34) are buckled with each other to improve the die assembly stability of the first locking piece and the second locking piece;

when the secondary template (16) is driven by the primary top plate (28), the first locking piece (33) is separated from the second locking piece (34).

10. The inside and outside loose core injection mold according to claim 4, characterized in that: be equipped with runner (35) on first cover half (2), be equipped with in runner (35) and pour piece (36) of watering, be equipped with in pouring piece (36) and pour passageway (37) of watering, it is used for the butt joint mouth of moulding plastics to pour passageway (37) one end of watering, and it is just to shaping chamber (6) to pour passageway (37) other end of watering, and it is close to in shaping chamber (6) to pour passageway (37) of watering and is equipped with pneumatic needle valve (38), pneumatic needle valve (38) are used for controlling to pour the inside of watering passageway (37) and open and close.