WO2023040269A1

WO2023040269A1 - Straight-oblique core-pulling driving mechanism

Info

Publication number: WO2023040269A1
Application number: PCT/CN2022/088966
Authority: WO
Inventors: 梁正华; 梁凯; 王华良; 林连明
Original assignee: 浙江凯华模具有限公司
Priority date: 2021-09-14
Filing date: 2022-04-25
Publication date: 2023-03-23
Also published as: CN113733490B; CN113733490A

Abstract

The present invention relates to a straight-oblique core-pulling driving mechanism, comprising: an upper mold, a lower mold having an upper end provided with a cavity counterbore, a core mold provided with a central through hole and a lower protruding core disk coaxial with the central through hole, and connected to a lower end of the upper mold, a cavity enclosed by the core mold, the upper mold, and the lower mold and provided with a side enclosure at an upper end, a plurality of straight-oblique core assemblies arranged along the circumferential direction of the central through hole, and straight-oblique core-pulling driving apparatuses. Each straight-oblique core assembly comprises: a straight core-pulling hole and an oblique core-pulling hole passing through the core mold and having both ends communicated with the central through hole and the side enclosure in a one-to-one correspondence manner, a straight core-pulling rod disposed in the straight core-pulling hole, a straight core column connected to an outer end of the straight core-pulling rod, an oblique core-pulling rod disposed in the oblique core-pulling hole, and an oblique core column connected to an outer end of the oblique core-pulling rod. According to the straight-oblique core-pulling driving mechanism, core pulling is achieved by means of a core-pulling apparatus having a compact structure, occupying small space, low in cost, and convenient in maintenance.

Description

Straight inclined core-pulling drive mechanism

technical field

The invention relates to the technical field of injection molds, in particular to a straight-inclined core-pulling drive mechanism.

Background technique

Forming molds for injection molding or die-casting often have a core mold and a core-pulling structure; the structure of the core-pulling mechanism can be obtained from a die-casting mold core-pulling structure disclosed in the utility model of Chinese Patent Application No. 202022594224.3; The structure can be understood from an oblique core-pulling structure disclosed in the utility model of Chinese Patent Application No. 202022594204.6. Accompanying drawing 3 shows that a kind of casing type injection molding part that is provided with middle hole 31 and side wall 32, side wall is provided with straight hole group 33 and is positioned at the inclined hole group 34 of straight hole group lower side; When it is necessary to pull the core mold from different directions, it is usually necessary to use multiple core-pulling mechanisms to achieve core-pulling, which has the disadvantages that the structure of the core-pulling mechanism is complex and occupies a large space, and the cost is high. Maintenance is troublesome; therefore, it is necessary to design a A core-pulling device with a compact structure and a small footprint to achieve core-pulling, and a straight-inclined core-pulling drive mechanism with low cost and easy maintenance have become urgent problems to be solved.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages that the core-pulling mechanism has a compact structure, takes up a lot of space, is expensive and troublesome to maintain when the current forming mold has two core molds that need to be core-pulled from different core-pulling directions, and provides a The core-pulling is realized by a core-pulling device with a simple structure and a small footprint, and a straight-inclined core-pulling drive mechanism with low cost and convenient maintenance.

Concrete technical scheme of the present invention is:

A straight-inclined core-pulling drive mechanism, comprising: an upper mold, a lower mold with a cavity counterbore at the upper end, a core with a central through hole and a lower convex core disc coaxial with the central through hole and connected to the lower end of the upper mold Die, core mold, upper mold and lower mold are surrounded by a cavity with a side cavity at the upper end, several straight inclined core assemblies distributed along the circumference of the middle through hole, and a straight inclined core pulling drive device; the straight inclined core assembly includes : The straight core-pulling hole and the oblique core-pulling hole which are installed in the mandrel and whose two ends correspond to the central through hole and the side wall cavity one by one, the straight core-pulling rod placed in the straight core-pulling hole, and the straight core-pulling hole A straight core column connected to the outer end of the rod, an oblique core rod placed in the oblique core pulling hole, and an oblique core rod connected to the outer end of the oblique core rod.

Preferably, the straight core-pulling hole is located on the upper side of the oblique core-pulling hole.

As a preference, the straight-inclined core-pulling driving device includes: a driving column whose upper end is provided with a diameter adapted to the diameter of the middle through hole and whose lower end is connected to the bottom surface of the counterbore of the cavity; The number of push columns is the same as the number of straight inclined core components, and there is a one-to-one correspondence with the straight inclined core pulling device; the straight inclined core pulling device includes: a storage counterbore arranged on the side of the middle through hole and connected with the upper end of the mandrel, The mounting counterbore provided at the outer end of the counterbore and connected to the upper end of the mandrel is placed in the counterbore and the outer end of the guide block is provided with a vertical T-shaped groove, which is located at the inner end of the guide block and is aligned with the frustum of the cone. The tapered surface for the push column, the T-shaped slider placed in the vertical T-shaped slot and connected to the inner end of the straight core-pulling rod, the compression spring placed in the installation counterbore and sleeved outside the straight core-pulling rod; The two ends of the spring press the outer end of the guide block and the outer end of the installation counterbore one by one; the inner end of the oblique core pulling rod is connected with the guide block; the width of the guide block is adapted to the width of the accommodating counterbore.

Preferably, the straight-inclined core-pulling drive device further includes: a limit block coaxial with the middle through hole and connected with the lower end of the upper mold.

Preferably, the lower mold is provided with a straight counterbore located outside the side outer cavity and opposite to the straight stem, and an inclined counterbore opposite to the inclined stem.

Preferably, the lower mold is provided with a plurality of ejector pin holes, ejector pins whose upper ends are located in the ejector pin holes, and top plates respectively connected to the lower ends of the ejector pins.

Preferably, the upper end of the upper mold is provided with a runner communicating with the upper end of the side enclosure cavity.

Compared with the prior art, the beneficial effect of the present invention is that: for the straight-inclined core-pulling drive mechanism, when the mold is closed, the upper end of the truncated cone-shaped push column is inserted into the conical surfaces provided at the inner ends of the guide blocks of multiple straight-inclined core-pulling devices. Between them, the frustum-shaped push column cooperates with the conical surface to push the guide block to drive the straight core rod and the oblique core rod to move outwards against the resistance of the pressure spring, and the outer ends of the straight core column and the oblique core column are inserted into the straight counterbore and the oblique core column one by one. The oblique sinking hole, since the right end of the straight core-pulling rod is connected with the slider placed in the large end of the vertical T-shaped slot and can slide vertically, there will be no interference; Under the action of the reset force of the compression spring, the compression spring pushes the guide block to drive the straight core-pulling rod and the oblique core-pulling rod to move inwardly, and the outer ends of the straight stem and the oblique stem respectively exit the straight counterbore and the oblique counterbore, and respectively Move inward to the straight core-pulling hole and the oblique core-pulling hole, since the right end of the straight core-pulling rod is connected with the slider placed in the large end of the vertical T-shaped slot and can slide vertically, there will be no interference; through a structure The compact core-pulling device takes up less space to realize core-pulling, and the cost is low and the maintenance is convenient. The limit block limits the inner end of the guide block to improve safety. The lower mold is provided with a straight countersunk hole opposite to the straight stem and an oblique counterbore opposite to the slanted stem on the outside of the side enclosure cavity, which is conducive to accurate and stable positioning of the straight stem and the slant stem. The lower mold is provided with a plurality of ejector pin holes, an ejector pin whose upper end is located in the ejector pin hole, and a top plate respectively connected with the lower end of the ejector pin, which is beneficial for ejecting the injection molded part.

Description of drawings

Fig. 1 is a kind of structural representation of the present invention;

Fig. 2 is the A-A view of Fig. 1;

Fig. 3 is a schematic structural view of an injection molded part of the case.

In the figure: upper mold 1, cavity sink hole 2, lower mold 3, middle through hole 4, lower convex core plate 5, core mold 6, side cavity 7, cavity 8, straight core-pulling hole 9, oblique core-pulling Hole 10, straight core rod 11, straight core rod 12, oblique core rod 13, oblique core rod 14, drive column 15, frustum-shaped push rod 16, accommodating counterbore 17, installation counterbore 18, vertical T shape Groove 19, guide block 20, tapered surface 21, T-shaped slider 22, pressure spring 23, limit block 24, straight sink hole 25, oblique sink hole 26, ejector pin hole 27, ejector rod 28, top plate 29, sprue 30, middle hole 31, side wall 32, straight hole group 33, inclined hole group 34.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2: a straight-inclined core-pulling drive mechanism, including: an upper mold 1, a lower mold 3 with a cavity sink hole 2 at the upper end, and a middle through hole 4 and a middle through hole 4 The coaxial lower convex core plate 5 and the core mold 6 screwed to the lower end of the upper mold 1, the core mold 6, the upper mold 1 and the lower mold 3 are surrounded by a cavity 8 with a side cavity 7 at the upper end, four Straight inclined core assembly uniformly distributed along the circumference of the central through hole 4, and a straight inclined core pulling drive device; the straight inclined core assembly includes: pierced in the mandrel 6 and communicated with the central through hole 4 and the side enclosure cavity 7 in one-to-one correspondence at both ends The straight core-pulling hole 9 and the inclined core-pulling hole 10, the straight core-pulling rod 11 placed in the straight core-pulling hole 9, and the straight core column 12 connected with the outer end of the straight core-pulling rod 11 are integrally formed, and the straight core-pulling rod 12 is placed in the oblique core-pulling hole The oblique core rod 13 in the hole 10 is integrated with the outer end of the oblique core rod 13 to form a connected oblique stem 14 .

The straight core-pulling hole 9 is located on the upper side of the oblique core-pulling hole 10 .

The straight-inclined core-pulling driving device includes: the upper end is provided with a driving column 15 whose diameter is in clearance fit with the diameter of the middle through hole 4, and the lower end is integrally connected with the bottom surface of the cavity 8 counterbore 2, and the large end is coaxial with the upper end of the driving column 15. Conical frustum-shaped push columns 16 integrally formed, the number of which is the same as the number of straight-inclined core components and one-to-one corresponding straight-inclined core-pulling device; 6 The receiving counterbore 17 through which the upper end penetrates, and the installation counterbore 18 which is arranged at the outer end of the accommodating counterbore 17 and penetrates with the upper end of the mandrel 6 is placed in the accommodating counterbore 17 and the outer end is provided with a vertical T-shaped groove The guide block 20 of 19 is set at the inner end of the guide block 20 and the conical surface 21 adapted to the frustum-shaped push column 16 is placed in the vertical T-shaped groove 19 and is screwed with the inner end of the straight core rod 11. The slide block 22 is placed in the installation counterbore 18 and is set on the compression spring 23 outside the straight core pulling rod 11; the two ends of the compression spring 23 press the outer end of the guide block 20 and the outer end of the installation counterbore 18 correspondingly; The inner end of the core pulling rod 13 is connected with the guide block 20 . The diameter of the large end of the frustum-shaped push column 16 is the same as that of the drive column 15;

The straight-inclined core-pulling driving device further includes: a limit block 24 coaxial with the middle through hole 4 and connected with the lower end of the upper die 1 .

The lower mold 3 is provided with a straight counterbore 25 located outside the side enclosure cavity 7 and opposite to the straight stem 12 , and an inclined counterbore 26 opposite to the inclined stem 14 .

The lower mold 3 is provided with a plurality of ejector pin holes 27, an ejector pin 28 whose upper end is located in the ejector pin hole 27, and a top plate 29 screwed to the lower end of the ejector pin 28 respectively.

The upper end of the upper mold 1 is provided with a runner 30 communicating with the upper end of the side enclosure cavity 7 .

In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features or technical data of the present invention can be re-selected and combined to form new embodiments, which are not necessary for those skilled in the art. It can be realized by performing creative work, so these embodiments of the present invention that are not described in detail should also be regarded as specific embodiments of the present invention and fall within the protection scope of the present invention.

Claims

A straight-inclined core-pulling drive mechanism, comprising: an upper mold, a lower mold with a cavity counterbore at the upper end, characterized in that the straight-inclined core-pulling drive mechanism also includes: a central through hole and a central through hole A core mold with a coaxial lower convex core plate and connected to the lower end of the upper mold. The core mold, upper mold and lower mold are surrounded by a cavity with a side cavity at the upper end. Several straight holes distributed along the circumference of the middle through hole Inclined core assembly, straight-inclined core-pulling drive device; the straight-inclined core assembly includes: a straight core-pulling hole and an oblique core-pulling hole that are installed in the mandrel and communicate with the central through hole and the side wall cavity in one-to-one correspondence at both ends. Straight core-pulling rod in the straight core-pulling hole, straight core rod connected to the outer end of the straight core-pulling rod, oblique core rod placed in the oblique core-pulling hole, oblique core rod connected to the outer end of the oblique core-pulling rod .
The straight-inclined core-pulling driving mechanism according to claim 1, wherein the straight core-pulling hole is located on the upper side of the oblique core-pulling hole.
The straight-inclined core-pulling driving mechanism according to claim 2, wherein the straight-inclined core-pulling driving device comprises: an upper end with a diameter adapted to the diameter of the middle through hole and a lower end connected to the bottom surface of the counterbore of the cavity. Drive column, a frustum-shaped push column whose large end is coaxially connected to the upper end of the drive column, and a straight-inclined core-pulling device with the same number as the number of straight-inclined core components and one-to-one correspondence; the straight-inclined core-pulling device includes: The accommodating counterbore which surrounds the side of the hole and penetrates the upper end of the mandrel is arranged at the outer end of the accommodating counterbore and the installation counterbore which penetrates the upper end of the mandrel is placed in the accommodating counterbore and the outer end is provided with a vertical T shape The guide block of the slot is set at the inner end of the guide block and the conical surface adapted to the frustum-shaped push column, placed in the vertical T-shaped slot and connected with the inner end of the straight core-pulling rod, placed in the installation sink The compression spring in the hole and set outside the straight core-pulling rod; the two ends of the compression spring correspond to the outer end of the guide block and the outer end of the counterbore; the inner end of the oblique core-pulling rod is connected to the guide block; the width of the guide block Adapt to the width of the receiving counterbore.
The straight-inclined core-pulling driving mechanism according to claim 3, wherein the straight-inclined core-pulling driving device further comprises: a limit block coaxial with the middle through hole and connected with the lower end of the upper mold.
According to claim 1 or 2 or 3 or 4 described straight-inclined core-pulling driving mechanism, it is characterized in that, the said lower die is provided with a straight counterbore located outside the side outer cavity and opposite to the straight stem, Column opposite oblique counterbore.
The straight-inclined core-pulling drive mechanism according to claim 1 or 2 or 3 or 4, wherein the lower mold is provided with a plurality of ejector pin holes and ejector pins whose upper ends are located in the ejector pin holes, and the ejector pins The lower ends are respectively connected to the top plate.
The straight-inclined core-pulling drive mechanism according to claim 1, 2, 3 or 4, wherein the upper end of the upper mold is provided with a runner communicating with the upper end of the side enclosure cavity.