CN111070594A

CN111070594A - Injection mold

Info

Publication number: CN111070594A
Application number: CN201911395668.XA
Authority: CN
Inventors: 罗代亮; 王家昌; 石浩天; 佟孟云; 赵国群
Original assignee: Qingdao Hisense Mould Co Ltd
Current assignee: Qingdao Hisense Mould Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-28
Anticipated expiration: 2039-12-30
Also published as: CN111070594B

Abstract

The invention discloses an injection mold, comprising: the pushing frame is positioned between the upper die and the lower die and sleeved outside the die core; the inclined top is used for demoulding of a back-off structure on a product and is arranged on the mold core in a sliding manner; the linkage structure is arranged between the push frame and the inclined top; when the product is demoulded, the push frame drives the pitched roof to move through the linkage structure, so that the demoulding of the inverted buckle structure on the product is realized, and then the linkage structure is released, so that the push frame is separated from the pitched roof. The push frame drives the inclined top to move to realize demoulding of the inverted buckle structure, an ejection system of the mould can be omitted, the thickness of the mould is favorably reduced, the mould can be accommodated in an injection molding machine with smaller tonnage, and the injection molding production cost of a product is reduced; meanwhile, the length of the pitched roof is favorably shortened, so that the processing difficulty coefficient of the pitched roof is reduced, the size precision of the pitched roof is easier to guarantee, and the pitched roof moves more stably.

Description

Injection mold

Technical Field

The invention belongs to the technical field of molds, and particularly relates to an injection mold.

Background

At present, injection molded products are widely cited. For high box products with an opening, as shown in fig. 1, a temperature-changing drawer on a refrigerator is provided, and an inverted buckle structure 101 protruding inwards is provided on the inner wall of the temperature-changing drawer 10; if the product is not internally provided with the inverted buckle structure 101, the mold of the high box product can directly use the push frame to realize the demolding and ejection of the product; however, for a high box product with an inverted buckle structure inside the product, according to a conventional pitched roof scheme, the mold 100 needs to add the ejection system 102 to drive the pitched roof structure 103, as shown in fig. 3, so that the thickness of the mold 100 is increased, which results in that only injection molding parts with larger tonnage can be used, and the injection molding cost is greatly increased. The use of smaller tonnage injection molding machines has been one of the major measures sought by product companies and injection molding suppliers to increase competitiveness and reduce production costs. Therefore, when selecting a mold supplier, the specific gravity of the mold supplier is gradually increased for the realization of the technical capability consideration of the smaller tonnage injection molding machine.

In addition, for high-box products, the ejection distance of the products is generally large, the inclined top can hang out very long after the die is ejected, and the inclined top can be poor due to gravity, so that the problems of jamming and unsmooth locking of the inclined top during movement are easily caused, and the problem is generally existed in the inclined top with the long ejection distance.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the injection mold, which is beneficial to reducing the thickness of the mold, adopts a lower-tonnage injection molding machine, reduces the injection molding cost of a product, and is beneficial to reducing the manufacturing cost of the mold.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

an injection mold comprising:

the lower die is provided with a lower die base and a die core arranged on the lower die base;

the upper die is matched with the lower die, and a die cavity is formed in the upper die;

the pushing frame is positioned between the upper die and the lower die and sleeved outside the die core;

the inclined top is used for demoulding of a back-off structure on a product and is arranged on the mold core in a sliding manner;

the linkage structure is arranged between the push frame and the inclined top; when the product is demoulded, the push frame drives the pitched roof to move through the linkage structure, so that the demoulding of the inverted buckle structure on the product is realized, and then the linkage structure is released, so that the push frame is separated from the pitched roof.

Furthermore, linkage structure is for establishing draw hook on pushing away the frame, establish and be used for realizing the limit structure of linkage between draw hook and the oblique top.

Furthermore, limit structure does set up the spacing protruding of inside arch on the drag hook and set up on the oblique top with the spacing groove of spacing protruding assorted indent, the oblique top inwards removes when opening the mould direction motion, makes spacing protruding breaks away from with the spacing groove.

The mold further comprises an insert arranged on the mold core, and the insert is used for limiting the movement of the lifter in the mold opening direction.

Furthermore, a sliding groove matched with the inclined top is formed in the mold core, the inclined top is slidably located in the sliding groove, and the sliding groove is inclined inwards in the mold opening direction.

Further, the insert and the sliding groove surround to form a guide hole for guiding the inclined top to move, and the inclined top is located in the guide hole.

Furthermore, the insert is provided with a positioning protrusion protruding inwards, the inclined top is provided with a positioning groove, and the size of the positioning groove is larger than that of the positioning protrusion in the mold opening direction.

Further, the difference value between the size of the positioning groove and the size of the positioning protrusion in the mold opening direction is equal to the moving distance of the inclined top in mold opening.

Furthermore, a through hole for a mandril to pass through is formed in the lower die base, and the mandril is used for pushing the push frame to move.

Furthermore, a guide rod and a spring sleeved on the guide rod are arranged between the inclined top and the lower die holder, and the arrangement direction of the guide rod is the same as the moving direction of the inclined top.

Furthermore, a reverse-buckling concave cavity for forming the reverse-buckling structure is arranged on the inclined top.

Furthermore, a guide groove communicated with the sliding groove is formed in the mold core, the guide groove is parallel to the sliding groove, a guide protrusion matched with the guide groove is arranged on the oblique top, and the guide protrusion can be slidably located in the guide groove.

Further, the size of the inclined top in the mold opening direction is equal to the size of the mold core in the mold opening direction.

Compared with the prior art, the invention has the advantages and positive effects that: by arranging the linkage structure, the linkage of the push frame and the inclined top is realized, and the demoulding of the back-off structure on the product is realized; the push frame moves in the mold opening direction, and the inclined top moves inwards while moving in the mold opening direction in order to realize mold release, namely the inclined top moves obliquely, so that the inverted buckle structure is released from the mold; and then the linkage between the push frame and the inclined top is released, the push frame continues to move in the mold opening direction, the inclined top does not move any more, and the moving distance of the inclined top is favorably shortened. The push frame drives the inclined top to move to realize demoulding of the inverted buckle structure, an ejection system of the mould can be omitted, the thickness of the mould is favorably reduced, the mould can be accommodated in an injection molding machine with smaller tonnage, and the injection molding production cost of a product is reduced; meanwhile, the length of the pitched roof is favorably shortened, the processing difficulty coefficient of the pitched roof is reduced, the size precision of the pitched roof is easier to guarantee, the pitched roof moves more stably, and the reliability and the stability of the die mass production are further improved.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a temperature-changing drawer on a refrigerator;

FIG. 2 is an enlarged schematic view of region A in FIG. 1;

FIG. 3 is a schematic view of a prior art mold for injection molding FIG. 1;

FIG. 4 is a schematic structural diagram of an embodiment of an injection mold according to the present invention;

FIG. 5 is a schematic perspective view of the upper mold and product of FIG. 4 with the upper mold removed;

FIG. 6 is a schematic view of a portion of the structure of FIG. 4 after detonation;

FIG. 7 is an enlarged schematic view of the pitched roof of FIG. 6;

FIG. 8 is a schematic cross-sectional view of FIG. 7;

FIG. 9 is an enlarged schematic view of the lower mold of FIG. 6;

FIG. 10 is a schematic structural view of the first step in the mold opening process after the upper mold is opened;

FIG. 11 is an enlarged view of the area B in FIG. 10;

FIG. 12 is a schematic view of the second step of moving the frame-pushing belt upward and obliquely;

FIG. 13 is an enlarged view of the area C in FIG. 12;

FIG. 14 is a schematic structural view of a third step in the mold opening process, in which a pushing frame pushes the product to move upward for demolding;

fig. 15 is a schematic structural diagram of the fourth step in the mold opening process, in which the push frame moves downward to reset.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the positional relationships shown in the drawings, and the directions near the center line of the core are "inner" and vice versa. The terminology is for the purpose of describing the invention only and is for the purpose of simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and is not to be considered limiting of the invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 4-15, an embodiment of the injection mold provided by the present invention is an injection mold for injection molding of a box-like product having an inverted structure, comprising: the device comprises an upper die 1, a lower die 2 and a push frame 3 arranged between the upper die 1 and the lower die 2, wherein the lower die 2 is provided with a lower die seat 21 and a die core 22 arranged on the lower die seat 21, the push frame 3 is sleeved on the outer side of the die core 12, and the upper die 1 is provided with a die cavity 11; in order to form the inverted buckle structure 101 on the inner wall of the product 10 and realize the demoulding of the inverted buckle structure 101, an inclined top 4 is arranged, an inverted buckle cavity 41 for forming the inverted buckle structure 101 is arranged on the inclined top 4, the inclined top 4 is slidably arranged on the mould core 22, the demoulding of the inverted buckle structure 101 is realized through the sliding of the inclined top 4 during the mould opening, and the inclined top 4 and the mould core 22 extend into the mould cavity 11; the linkage structure 5 is arranged between the push frame 3 and the inclined top 4 and used for realizing that the push frame 5 drives the inclined top 4 to move, when a product is demoulded, the push frame 3 drives the inclined top 4 to move through the linkage structure 5, so that the demoulding of the inverted buckle structure 101 on the product 10 is realized, and then the linkage structure 5 is released, so that the push frame 3 is separated from the inclined top 4.

The linkage of the push frame 3 and the inclined top 4 is realized by arranging the linkage structure 5, and the demoulding of the back-off structure 101 on the product is realized; the push frame 3 moves in the mold opening direction, the mold opening direction is upward in the drawing, and the lifter 4 needs to move inward while moving in the mold opening direction in order to realize the mold release, that is, the lifter 4 moves obliquely, so as to realize the mold release of the inverted buckle structure 101; and then the linkage between the push frame 3 and the inclined top 4 is released, so that the push frame 3 continuously moves in the mold opening direction, the inclined top 4 does not move any more, and the moving distance of the inclined top 4 is favorably shortened. The push frame 3 drives the inclined top 4 to move to realize demoulding of the inverted buckle structure 101, so that an ejection system of a mould can be omitted, the thickness of the mould can be reduced, the mould can be accommodated in an injection molding machine with smaller tonnage, and the injection molding production cost of a product is reduced; meanwhile, the length of the pitched roof 4 is favorably shortened, so that the processing difficulty coefficient of the pitched roof 4 is reduced, the size precision of the pitched roof 4 is ensured more easily, the pitched roof 4 moves more stably, and the reliability and stability of the mass production of the die are further improved.

As shown in fig. 10-fig. 13, when the mold is opened, the push frame 3 moves in the mold opening direction, i.e., moves upward, and the linking structure 5 drives the lifter 4 to move upward and inward in an inclined manner, i.e., during the upward movement, the lifter 4 moves inward relative to the push frame 3; and in order to shorten the moving distance of the lifter, the lifter 4 is not moving following the push frame 3 after the back-off structure 101 is demolded. For the arrangement of the linkage structure 5, the inclined top 4 needs to be provided with upward force and can move relatively in the inward and outward directions; specifically, the linkage structure 5 is a draw hook 51 arranged on the push frame 3, and a limit structure arranged between the draw hook 51 and the lifter 4 and used for realizing linkage. The limiting structure is that a limiting protrusion 511 which protrudes inwards is arranged on the drag hook 51, a limiting groove 41 is arranged on the inclined top 4, and the limiting groove 41 is matched with the limiting protrusion 511; when the limiting protrusion 511 is located in the limiting groove 41, the pushing frame 3 moves upwards to drive the drag hook 51 and the limiting protrusion 511 on the drag hook 51 to move upwards, the limiting protrusion 511 is located in the limiting groove 41, and then the force of the upward movement is transmitted to the lifter 4 through the positioning protrusion 511 to push the lifter 4 to move upwards and inwards, so that the lifter 4 moves synchronously with the pushing frame 3 in the up-down direction, the lifter 4 moves inwards relative to the pushing frame 3 in the inside-outside direction, that is, the limiting groove 41 moves inwards relative to the limiting protrusion 511, and the limiting groove 41 and the limiting protrusion 511 are far away; when the limiting groove 41 is separated from the limiting protrusion 511, the push frame 3 and the inclined top 4 are released from linkage, and the reverse buckle structure 101 is required to be demoulded before linkage is released; preferably, the extending size of the reverse buckling structure is smaller than the distance of the limiting structure which needs to move in the inward and outward directions for realizing separation.

In other embodiments, the linkage structure may be configured in other structural forms, such as a limiting protrusion directly disposed on the pushing frame and matching with the limiting groove 4.

Referring to fig. 5 and 9, for the slidable fit between the lifter 4 and the mold core 22, a sliding groove 221 matched with the lifter 4 is formed on the mold core 22, the lifter 4 is slidably located in the sliding groove 221, and the sliding groove 221 is inclined inward in the mold opening direction. By arranging the sliding groove 221, the movement of the pitched roof 4 in the sliding groove 221 can be realized; the chute 22 is arranged obliquely, so that the oblique top 4 can move obliquely along the chute 22 when being subjected to upward force.

In this embodiment, the injection mold further includes an insert 23 disposed on the mold core 22, the insert 23 is configured to limit movement of the linked lifter 4 in the mold opening direction, and after the limiting groove 41 is separated from the limiting protrusion 511, the lifter 4 is stopped by the insert 23 from continuing to move upward, so that the lifter 4 is prevented from continuing to move upward under the action of inertia or friction, and the movement distance of the lifter 4 during mold opening is ensured.

Referring to fig. 7 to 9, in order to ensure that the lifter 4 can smoothly move along the sliding groove 221 by a distance when receiving an upward force from the interlocking structure 5, it is necessary to limit the force of the lifter 4 in a direction other than the extending direction of the sliding groove 221, and two guide structures are preferably provided near the upper and lower ends of the sliding groove 221. The insert 23 is fixed on two sides of the sliding groove 221, a guide hole for guiding the inclined top 4 to move is formed between the insert 23 and the sliding groove 221, and the inclined top 4 penetrates through the guide hole; the insert 23 is arranged at the lower part of the sliding groove 221, and the movement of the inclined top 4 at the guide hole in the plane direction is limited, so that the moving stability of the inclined top 4 at the guide hole is ensured; so that the insert 23 has the function of stopping the movement of the pitched roof 4, and simultaneously has the function of limiting and guiding the movement of the pitched roof 4. The mold core 22 is provided with a guide groove 222 communicated with the sliding groove 221, the guide groove 222 is arranged in parallel with the sliding groove 221, the guide groove 222 is arranged at the upper part of the sliding groove 221, the inclined top 4 is provided with a guide projection 44 matched with the guide groove 222, and the guide projection 44 is slidably positioned in the guide groove 222. The guide groove 222 and the guide projection 44 are arranged to facilitate the guiding and limiting functions of the lifter 4 in the sliding process, and the guide hole and the guide groove 222 are guiding structures at two positions above and below the lifter 4, so that the inclined movement of the lifter 4 along the extending direction of the sliding groove 221 is limited when the lifter 4 is subjected to an upward force.

Referring to fig. 13, an inwardly protruding positioning protrusion 231 is provided on the insert 23, and a positioning groove 43 is provided on the lifter 4, and the size of the positioning groove 43 is larger than that of the positioning protrusion 231 in the mold opening direction. In the mold closing state, the upper end of the positioning protrusion 231 is in contact with the upper end wall of the positioning groove 43, and the upper end of the positioning protrusion 231 is in contact fit with the upper end wall of the positioning groove 43, so that the insert 23 can be installed and positioned, and the installation efficiency of the insert 23 can be improved; when the mold is opened, the push frame 3 drives the pitched roof 4 to move upwards in an inclined manner, the insert 23 is fixed on the mold core 22 and is in a static state, after the pitched roof 4 moves to the lower end wall of the positioning groove 43 and the lower end of the positioning protrusion 231, the positioning protrusion 231 stops the pitched roof 4 from moving upwards continuously, at the moment, the limiting groove 41 is separated from the limiting protrusion 511, and the pitched roof 4 moves upwards in place; that is, in the mold opening direction, the difference between the size of the positioning groove 43 and the size of the positioning projection 231 is equal to the moving distance of the lifter 4 when the mold is opened.

The inclined top 4 extends outwards along the lower end wall of the positioning groove 43 to form a mounting edge 45, and the push frame 3 is positioned above the mounting edge 45 in the mold closing state. The outer side of the assembling edge 45 is provided with a notch 42, the inner side wall of the notch 42 is provided with a limiting groove 41, a draw hook 51 is fixed at the lower end of the push frame 3, and the draw hook 51 is positioned in the notch 42.

A guide rod 6 and a spring 61 sleeved on the guide rod 6 are arranged between the inclined top 4 and the lower die holder 21, and the arrangement direction of the guide rod 6 is the same as the moving direction of the inclined top 4. The guide rod 6 is used for supporting the spring 61, and has guiding function on the spring 61, so that the spring 61 is prevented from bending to cause damage or failure; set up spring 61, play supplementary ejecting effect, a pulling force for alleviateing drag hook 51, and at the ejecting in-process of 4 oblique tops, break away from with spacing protruding 511 at spacing groove 41, push away

frame

3 and 4 remove the linkage back of pushing away to one side, 4 downward directions of oblique top do not have spacingly, the process of kick-backing behind the ascending spacing face of striking can appear in oblique top 4, the spring plays to support oblique top 4 and avoids kick-backing, guarantee that oblique top 4 stops in the position that spacing groove 41 and spacing protruding 511 break away from.

The back-off concave cavity 46 for molding the back-off structure 101 is arranged on the inclined top 4, and the size of the inclined top 4 in the mold opening direction is equal to the size of the mold core 22 in the mold opening direction. In order to provide upward thrust for the push frame 3, a through hole 211 for a push rod to pass through is formed in the lower die holder 21, and the push rod is arranged on the injection molding machine and driven by a power mechanism.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. An injection mold, comprising:

2. The injection mold of claim 1, wherein the linkage structure is a draw hook arranged on the push frame, and a limit structure arranged between the draw hook and the lifter and used for realizing linkage.

3. The injection mold according to claim 2, wherein the limiting structure is a limiting protrusion protruding inwards on the drag hook and a limiting groove recessed inwards to match with the limiting protrusion, and the oblique top moves inwards while moving in the mold opening direction, so that the limiting protrusion and the limiting groove are separated.

4. The injection mold of claim 1, further comprising an insert disposed on the core, the insert for limiting movement of the lifter in a mold opening direction.

5. The injection mold of claim 4, wherein the mold core is provided with a sliding groove matched with the lifter, the lifter is slidably located in the sliding groove, and the sliding groove is inclined inwards in the mold opening direction.

6. The injection mold according to claim 5, wherein the mold core is provided with a guide groove communicated with the slide groove, the guide groove is arranged in parallel with the slide groove, the inclined top is provided with a guide projection matched with the guide groove, and the guide projection is slidably positioned in the guide groove.

7. An injection mold as claimed in claim 5, wherein said insert and said runner surround a guide hole for guiding movement of said lifter, said lifter being located in said guide hole.

8. An injection mold according to claim 4, wherein a positioning protrusion protruding inward is provided on the insert, a positioning groove is provided on the lifter, and a dimension of the positioning groove in the mold opening direction is larger than a dimension of the positioning protrusion.

9. The injection mold of any one of claims 1 to 8, wherein a through hole for a push rod to pass through is formed in the lower die holder, and the push rod is used for pushing the push frame to move.

10. The injection mold of any one of claims 1 to 8, wherein a guide rod and a spring sleeved on the guide rod are arranged between the inclined top and the lower die holder, and the direction of the guide rod is the same as the moving direction of the inclined top.