CN219191118U

CN219191118U - Movable top core assembly formed by long and thin holes

Info

Publication number: CN219191118U
Application number: CN202121066660.1U
Authority: CN
Inventors: 丁波; 王姣姣; 鲍科成; 施孝剑
Original assignee: Ninghai First Rate Injection Mould Co ltd
Current assignee: Ninghai First Rate Injection Mould Co ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2023-06-16
Anticipated expiration: 2031-05-18

Abstract

The application discloses fashioned activity top core subassembly of elongated hole, its characterized in that: the injection molding machine comprises a movable core and an elastic piece, wherein the movable core is arranged on a template in a longitudinal sliding manner, the lower end of the movable core penetrates through the template and is used for forming an elongated hole, the elastic piece is arranged between the movable core and the template, the movable core is forced to move downwards by the elastic piece, and when an injection mold is in a mold closing state, the lower end of the movable core is forced to always abut against the upper end face of a side sliding block by the elastic piece. Has the advantages of simple structure, reliable movement and effective reduction of flash.

Description

Movable top core assembly formed by long and thin holes

Technical Field

The application relates to the field of injection molds, in particular to a forming mechanism.

Background

As shown in fig. 1 and fig. 2, the housing plastic part (100) of the automobile part is a housing plastic part (100), an inner cavity (101) is formed in the housing plastic part (100), an elongated hole (102) communicated with the inner cavity (101) is formed in the housing plastic part (100), and the inner cavity (101) and the elongated hole (102) serve as channels for fluid (gas or liquid) to pass through so as to realize the functions of the automobile part. The elongated holes (102) are used for precisely controlling the flow rate of the fluid, and the molding quality of the elongated holes (102) directly influences the qualification rate of the whole shell plastic (100). The slender hole (102) and the inner cavity (101) are formed by adopting a split core, and flash is easy to generate between the slender hole and the inner cavity; the presence of flash will affect the throughput of fluid, resulting in reduced control accuracy of the elongated aperture (102). In addition, since the flash exists at the intersection of the interior chamber (101) and the elongated aperture (102), it is located inside the interior chamber (101) and is difficult to remove with a trimming blade or other tool.

Therefore, how to improve the injection mold to overcome the above problems is a problem to be solved by those skilled in the art.

Disclosure of Invention

An object of the application is to provide a simple structure, control is convenient, and the high-quality injection mold's of shaping does not have flash elongated hole forming mechanism.

Another object of the present application is to provide a movable core assembly that is simple in construction, reliable in movement, and capable of effectively reducing the formation of elongated holes created by flash.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows: the utility model provides a plastic injection mold's no overlap elongated hole forming mechanism, includes the template that is used for shaping casing mould the outer profile, and is used for shaping the side sliding block of cavity on the casing mould, still including being used for shaping the activity top core subassembly of the last elongated hole of casing mould, activity top core subassembly include activity core and elastic component, activity core along vertical slip set up in on the template, just activity core lower extreme passes the template and be used for shaping elongated hole, the elastic component set up in between the activity core with the template, the elastic component forces activity core moves down, and when plastic injection mold is in the compound die state, the elastic component forces activity core lower extreme is contradicted all the time the side sliding block up end.

As an improvement, a scraping assembly is further arranged in the side sliding block, the scraping assembly comprises a pull rod and a scraper, the pull rod is suitable for pulling the side sliding block to pull the side sliding block to loose core along the transverse direction, and the scraper is movably arranged on the side sliding block; when the injection mold is in a mold closing state, the upper end face of the scraper is smoothly connected with the upper end face of the side sliding block, when the side sliding block performs core pulling, the pull rod can drive the scraper to move and be higher than the upper end face of the side sliding block, and the scraper can follow the side sliding block to move and scrape the upper end face of the inner cavity, so that flash formed between the inner cavity and the slender hole can be scraped.

Preferably, the pull rod is arranged in the side sliding block in a sliding manner along the transverse direction, the scraper is arranged on the side sliding block in a sliding manner along the longitudinal direction, a driving gap d is formed between the pull rod and the side sliding block, and the scraper has a downward sliding trend; the pull rod extends upwards to form a driving block, a driving inclined plane is arranged at the upper end of the driving block, the scraper extends downwards to form a linkage plate, a driven inclined plane is arranged at the lower end of the linkage plate, and the driven inclined plane is parallel to and always props against the driving inclined plane; when the pull rod is pulled, the driving gap d is gradually reduced, the pull rod drives the scraper to slide upwards through the cooperation of the driving inclined plane and the driven inclined plane, and when the driving gap d is zero, the pull rod pulls the side sliding block to loose core, and meanwhile the scraper moves along with the side sliding block and scrapes the upper end face of the inner cavity. The structure can effectively realize the linkage action of the pull rod on the scraper, and has the advantages of simple structure, reliable control and long service life.

As an implementation mode, a first permanent magnet is arranged on the side sliding block, the first permanent magnet is located below the scraper, the scraper has magnetic attraction, and the first permanent magnet can attract the scraper and enable the scraper to have a downward sliding trend.

As another implementation mode, the pull rod is provided with a second permanent magnet, the second permanent magnet is located below the linkage plate, the scraper has magnetic attraction, and the second permanent magnet can attract the scraper and enable the scraper to have a downward sliding trend.

As a further implementation mode, an installation cavity is formed in the side sliding block, a reset plate extends out of the installation cavity from the linkage plate, a first reset tension spring is arranged between the reset plate and the side sliding block, and the first reset tension spring forces the scraper to slide downwards.

As an improvement, a second return tension spring is arranged between the pull rod and the side sliding block, and forces the pull rod to slide inwards and enables the driving gap d to be at a maximum value. The second reset tension spring ensures that the scraper can not be influenced by the pull rod and is positioned at the lower end position in the mold closing process and in the mold closing state, and the scraper is prevented from influencing normal injection molding.

Preferably, the elongated hole is a round hole, and the edge of the scraper is arc-shaped. The circular arc-shaped cutting edge ensures that the scraper has better scraping effect and can efficiently and comprehensively scrape burrs.

Preferably, the movable core comprises a base section, a limiting section, a sealing section and a forming section from top to bottom in sequence, wherein the base section acts on the elastic piece, the limiting section limits the movable core to be separated from the template, the sealing section is in close contact with the template, and the forming section penetrates through the template and is suitable for forming the slender hole; the sealing section and the forming section are both cylindrical, and the diameter of the sealing section is larger than that of the forming section. In the above structure, if the sealing section and the molding section have equal diameters, burrs are easily formed in the elongated holes, and are not easily removed; and the sealing section diameter is greater than the setting of shaping section diameter for the overlap that probably produces is located the casing plastic top (i.e. the elongated hole outside), conveniently gets rid of.

Preferably, the movable core jacking component further comprises a fixed plug, the template is provided with a mounting hole in a penetrating mode, the movable core and the elastic piece are arranged in the mounting hole, the fixed plug is connected with the mounting hole in a threaded mode, and two ends of the elastic piece respectively abut against the lower end of the fixed plug and the upper end of the movable core. The structure has the advantages of simple structure, convenient processing and simple installation, and the fixed plug can be adjusted up and down for adjusting the tightness of the elastic piece.

Preferably, the sliding distance of the movable core is not more than 0.3mm. The micro-stroke can reduce the abrasion and the large-force collision of the movable core, thereby ensuring the service life of the movable core.

Further, the elastic piece is a low-elasticity long-service-life spring. The low-elasticity long-life spring can also reduce the pressure to the movable core as far as possible under the premise of meeting the use requirement that the lower end of the movable core always abuts against the side sliding block, and the service lives of the movable core and the elastic piece are guaranteed.

As an improvement, the upper end surface of the side sliding block is slightly concave to form an embedded table, and the movable core is tightly attached to and abutted against the embedded table. Further reduce the possible clearance between movable core and the side sliding block, improve the accuracy of shaping.

In the prior art, a top core for forming an elongated hole is generally fixedly arranged in a template; however, due to errors in mold processing, assembly, operation, etc., gaps are likely to exist between the top core and the side slide, and flash is generated during injection molding.

Compared with the prior art, the beneficial effect of this application lies in: this scheme has set up movable top core subassembly for movable core lower extreme can conflict side slider up end all the time for compensate mould processing, assembly, operation error, guarantee to have not the clearance between movable core and the side slider, thereby the production of overlap when reducing moulding plastics, the production of even eliminating the overlap completely.

In addition, this scheme has still set up the scraping subassembly, utilizes the loose core motion of side slider when the die sinking for the scraper can scrape the interior cavity up end that probably has the overlap, further strike off the overlap.

Through above-mentioned dual overlap removal structure, can realize the shaping of the long and thin hole of no overlap, have simple structure, control convenient advantage, guarantee the shaping quality of casing moulded piece simultaneously.

Drawings

Fig. 1 is a schematic perspective view of a conventional housing molding member according to the present application.

Fig. 2 is a schematic view of a prior art housing molding of the present application in semi-section.

Fig. 3 is a schematic perspective view of a preferred embodiment according to the present application.

Fig. 4 is an exploded view according to a preferred embodiment of the present application.

Fig. 5 is a schematic semi-sectional view according to a preferred embodiment of the present application.

Fig. 6 is an exploded view of a side slider and wiper assembly in accordance with a preferred embodiment of the present application.

Fig. 7 is an enlarged view at a in fig. 6 according to a preferred embodiment of the present application.

Fig. 8 is a schematic view of a structure of the wiper assembly according to a preferred embodiment of the present application in a non-operative state.

Fig. 9 is a schematic view of the structure of the scraping edge module according to a preferred embodiment of the present application in its working state.

Fig. 10 is a schematic view of the position of the first permanent magnet block in a preferred embodiment according to the present application.

Fig. 11 is a schematic view of the position of the second permanent magnet according to a preferred embodiment of the present application.

Fig. 12 is a schematic view of the positions of a first return tension spring and a second return tension spring in accordance with a preferred embodiment of the present application.

In the figure: 100. a housing molding; 101. an inner chamber; 102. an elongated aperture; 1. a template; 11. a mounting hole; 2. a side slider; 21. a fitting stage; 22. a mounting cavity; 3. a movable top core assembly; 31. a movable core; 32. an elastic member; 33. fixing the plug; 311. a base section; 312. a limiting section; 313. a sealing section; 314. a molding section; 4. a scraping assembly; 41. a pull rod; 42. a scraper; 43. a first permanent magnet; 44. the second permanent magnet block; 45. a first reset tension spring; 46. a second reset tension spring; 410. a driving inclined plane; 411. a driving block; 420. a driven inclined plane; 421. a linkage plate; 422. and a reset plate.

Detailed Description

The present application will be further described with reference to the specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

In the description of the present application, it should be noted that, for the azimuth terms such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific protection scope of the present application that the device or element referred to must have a specific azimuth configuration and operation, as indicated or implied.

It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims of the present application are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 and 2, the product that can be injection molded according to a preferred embodiment of the present application is a housing plastic 100 of an automobile, an inner cavity 101 is formed on the housing plastic 100, and an elongated hole 102 that communicates with the inner cavity 101 is formed on the housing plastic 100.

As shown in fig. 3 to 12, a preferred embodiment of the present application includes a die plate 1 for molding an outer contour of a housing molding 100, a side slider 2 for molding an inner cavity 101 of the housing molding 100, a movable core assembly 3 for molding an elongated hole 102 of the housing molding 100, and a wiper assembly 4 disposed within the side slider 2. The scheme mainly eliminates the generation of flash through the improved design of the following two aspects, and is specifically as follows:

on the one hand, the original fixed top core is improved into a movable top core component 3. As shown in fig. 4 and 5, the movable core ejecting assembly 3 includes a movable core 31 and an elastic member 32, the movable core 31 is slidably disposed on the mold plate 1 in a longitudinal direction, and the lower end of the movable core 31 passes through the mold plate 1 and is used for forming the elongated hole 102, the elastic member 32 is disposed between the movable core 31 and the mold plate 1, the elastic member 32 forces the movable core 31 to move downward, and when the injection mold is in a mold closing state, the elastic member 32 forces the lower end of the movable core 31 to always abut against the upper end surface of the side slide block 2, so as to reduce the gap and eliminate the flash.

In this embodiment, the movable core 31 sequentially includes, from top to bottom, a base section 311, a limiting section 312, a sealing section 313 and a forming section 314, where the base section 311 acts on the elastic member 32, the limiting section 312 limits the movable core 31 to be separated from the die plate 1, the sealing section 313 is tightly attached to the die plate 1, and the forming section 314 passes through the die plate 1 and is adapted to form the elongated hole 102; the sealing section 313 and the forming section 314 are both cylindrical, and the diameter of the sealing section 313 is larger than that of the forming section 314 so as to control the generation position of flash and facilitate removal.

As a specific installation mode, the movable core jacking component 3 further comprises a fixed plug 33, the template 1 is provided with a mounting hole 11 in a penetrating manner, the movable core 31 and the elastic piece 32 are arranged in the mounting hole 11, the fixed plug 33 is connected in the mounting hole 11 in a threaded manner, and two ends of the elastic piece 32 respectively abut against the lower end of the fixed plug 33 and the upper end of the movable core 31.

In this embodiment, the sliding distance of the movable core 31 is 0.2mm, and the micro-stroke can reduce the abrasion and the high-force collision of the movable core 31, thereby ensuring the service life of the movable core 31. In addition, the elastic member 32 is preferably a low-elasticity long-life spring. As a modification, the upper end surface of the side slider 2 is slightly recessed to form the fitting stage 21, and the movable core 31 is closely abutted against the fitting stage 21.

On the other hand, the wiper blade assembly 4 is provided by the core pulling movement of the side slider 2. As shown in fig. 6 to 9, the edge scraping assembly 4 comprises a pull rod 41 and a scraper 42, wherein the pull rod 41 is suitable for pulling the side sliding block 2 to perform core pulling along the transverse direction, and the scraper 42 is movably arranged on the side sliding block 2; when the injection mold is in a mold closing state, the upper end surface of the scraper 42 is smoothly connected with the upper end surface of the side sliding block 2, and when the side sliding block 2 performs core pulling, the pull rod 41 can drive the scraper 42 to move and be higher than the upper end surface of the side sliding block 2, and the scraper 42 can move along with the side sliding block 2 and scrape the upper end surface of the inner cavity 101 so as to scrape burrs formed between the inner cavity 101 and the elongated hole 102.

It should be noted that, during mold opening, the mold plate 1 needs to move preferentially and be demolded with the housing plastic part 100, and then the pull rod 41 pulls the side sliding block 2 to loose core and drives the scraper 42 to move, so that interference between the scraping edge component 4 and the movable top core component 3 is avoided.

In this embodiment, the pull rod 41 is slidably disposed in the side slider 2 along the transverse direction, the scraper 42 is slidably disposed on the side slider 2 along the longitudinal direction, a driving gap d is formed between the pull rod 41 and the side slider 2, and the scraper 42 has a tendency to slide downward; the pull rod 41 extends upwards to form a driving block 411, a driving inclined plane 410 is arranged at the upper end of the driving block 411, the scraper 42 extends downwards to form a linkage plate 421, a driven inclined plane 420 is arranged at the lower end of the linkage plate 421, and the driven inclined plane 420 is parallel to and always props against the driving inclined plane 410. The working principle is as follows: when the pull rod 41 is pulled, the driving gap d is gradually reduced, the pull rod 41 drives the scraper 42 to slide upwards through the cooperation of the driving inclined surface 410 and the driven inclined surface 420, when the driving gap d is zero, the pull rod 41 pulls the side sliding block 2 to loose core, and meanwhile the scraper 42 moves along with the side sliding block 2 and scrapes the upper end face of the inner cavity 101. It should be noted that, in addition to the above function by sliding the scraper 42 up and down, the scraper 42 may be turned over to make the edge of the blade higher than the side slider 2, which can also achieve the above function.

Numerous structures may be implemented to provide the scraper 42 with a downward sliding tendency, the present application exemplifies only the following three structures, but does not exclude other structures that may accomplish the above functions from falling within the scope of the present application. Specific:

as shown in fig. 10, as a first embodiment, the side slider 2 is provided with a first permanent magnet block 43, the first permanent magnet block 43 is located below the doctor blade 42, the doctor blade 42 has magnetic attraction, and the first permanent magnet block 43 can attract the doctor blade 42 and cause the doctor blade 42 to have a downward sliding tendency.

As shown in fig. 11, as a second embodiment, a second permanent magnet block 44 is provided on the pull rod 41, the second permanent magnet block 44 is located below the linkage plate 421, the doctor blade 42 has magnetic attraction, and the second permanent magnet block 44 can attract the doctor blade 42 and make the doctor blade 42 have a downward sliding tendency.

As shown in fig. 12, as a third embodiment, a mounting cavity 22 is formed in the side slider 2, a reset plate 422 extends into the mounting cavity 22 on a linkage plate 421, and a first reset tension spring 45 is disposed between the reset plate 422 and the side slider 2, and the first reset tension spring 45 forces the scraper 42 to slide downward.

As shown in fig. 12, in order to reset the tie bar 41 at the time of mold clamping, a second reset tension spring 46 is provided between the tie bar 41 and the side slide block 2, and the second reset tension spring 46 forces the tie bar 41 to slide inward and makes the drive gap d at a maximum value.

In this embodiment, the elongated hole 102 is a circular hole, and the blade edge of the scraper 42 is circular arc-shaped.

In this embodiment, the specific structure of the die plate and the side slider and the movement mode at the time of opening and closing are common general knowledge, and therefore, they are not specifically described in the present application, but they are not prevented from becoming the technical features underlying the present application.

The foregoing has outlined the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the present application is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of protection of the present application is defined by the appended claims and equivalents thereof.

Claims

1. An elongated hole formed movable core-ejecting assembly, characterized in that: the injection molding machine comprises a movable core and an elastic piece, wherein the movable core is arranged on a template in a longitudinal sliding manner, the lower end of the movable core penetrates through the template and is used for forming an elongated hole, the elastic piece is arranged between the movable core and the template, the movable core is forced to move downwards by the elastic piece, and when an injection mold is in a mold closing state, the lower end of the movable core is forced to always abut against the upper end face of a side sliding block by the elastic piece.

2. An elongated hole forming movable core assembly according to claim 1, wherein: the movable core sequentially comprises a base section, a limiting section, a sealing section and a forming section from top to bottom, wherein the base section acts on the elastic piece, the limiting section limits the movable core to be separated from the template, the sealing section is in close contact with the template, and the forming section penetrates through the template and is suitable for forming the slender hole; the sealing section and the forming section are both cylindrical, and the diameter of the sealing section is larger than that of the forming section.

3. An elongated hole forming movable core assembly according to claim 2, wherein: the movable core assembly further comprises a fixed plug, the template is provided with a mounting hole in a penetrating mode, the movable core and the elastic piece are arranged in the mounting hole, the fixed plug is connected with the mounting hole in a threaded mode, and two ends of the elastic piece are respectively abutted to the lower end of the fixed plug and the upper end of the movable core.

4. An elongated hole forming movable core assembly according to claim 1, wherein: the sliding distance of the movable core is not more than 0.3mm.

5. An elongated hole forming movable core assembly according to claim 1, wherein: the elastic piece is a low-elasticity long-service-life spring.

6. An elongated hole forming movable core assembly according to claim 1, wherein: the upper end face of the side sliding block is concave downwards to form an embedded table, and the movable core is tightly abutted against the embedded table.