CN109849279B - Key cap mould of three ejecting drawing of patterns - Google Patents
Key cap mould of three ejecting drawing of patterns Download PDFInfo
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- CN109849279B CN109849279B CN201910317415.4A CN201910317415A CN109849279B CN 109849279 B CN109849279 B CN 109849279B CN 201910317415 A CN201910317415 A CN 201910317415A CN 109849279 B CN109849279 B CN 109849279B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a key cap mould capable of being ejected and demoulded for three times, which belongs to the technical field of computer keyboard accessory preparation, and mainly comprises an upper mould core, a lower mould core and a thimble, wherein the upper mould core and the lower mould core are combined to form a mould cavity for forming a key cap, and the thimble upwards passes through the lower mould core to eject the formed key cap upwards; the upper surface of the lower die core is provided with a plurality of runners for injection molding of the keycaps, each runner comprises a main runner and sub-runners which are I-shaped, wherein four ends of each sub-runner are respectively connected with one die cavity, vertical connecting sections of two adjacent sub-runners are communicated and converged at the same end of the main runner, and four ends of each main runner are connected with two adjacent sub-runners; a filling head communicated with the vertical connecting section of the main flow channel is arranged above the middle part of the vertical connecting section. The invention can obtain higher molding efficiency on the premise of ensuring stable quality.
Description
Technical Field
The invention belongs to the technical field of notebook keyboards, and particularly relates to a manufacturing die of a keycap.
Background
The key cap is an essential part of the notebook keyboard, and has a square shell structure as shown in fig. 1-2, and four connecting parts, namely two first connecting parts 101 and two second connecting parts 102 are arranged on the inner surface of the key cap, wherein the first connecting parts 101 are provided with round hole structures. At present, the mold layout for key cap design is various, the number of one-time molding is limited due to unreasonable molding cavity layout, or the molding quality of the key cap is unstable due to the fact that the runner is disordered for simply increasing the number. In addition, the cooling effect is poor, the mass production of common computer accessories such as key caps is greatly limited, for example, the die cavity layout is disordered, the die core is designed only for obtaining the maximum molding quantity, the unreasonable die cavity layout also causes uneven water path distribution, the die cavity is usually surrounded in the middle of the die core, the cooling of the die part for molding the key caps in the center is poor, and enough time is reserved between each injection molding. In addition, the special structure of the key cap is difficult to form a mold cavity well, the key cap cannot be quickly and stably demolded, the adaptability is poor, great difficulty exists in molding and demolding, the keyboard is easy to deform and damage, and the efficiency is low. Therefore, there are many urgent areas to be improved in the current key cap manufacturing mold to improve the quality stability and the production efficiency of the injection molding of the key cap.
Disclosure of Invention
The invention aims to provide a key cap die capable of being ejected and demoulded for three times, which solves the technical problems of unreasonable layout of a cavity of the existing die and unstable molding quality.
The technical scheme of the invention is as follows:
the key cap die comprises an upper die core, a lower die core and a thimble, wherein a die cavity for forming the key cap is formed after the upper die core and the lower die core are combined, and the thimble upwards passes through the lower die core to upwards eject the formed key cap; the upper surface of the lower die core is provided with a plurality of runners for injection molding of the keycaps, each runner comprises a main runner and sub-runners which are I-shaped, wherein four ends of each sub-runner are respectively connected with one die cavity, vertical connecting sections of two adjacent sub-runners are communicated and converged at the same end of the main runner, and four ends of each main runner are connected with two adjacent sub-runners; and a filling head communicated with the main runner is arranged above the middle part of the vertical connecting section of the main runner.
The invention has the beneficial effects that: the invention reasonably designs the distribution of the die cavities of the key caps again, and utilizes the I-shaped runner structure to reasonably arrange the die cavities, so that the runner is more convenient for the flow and the split flow of plastic liquid and uniformly flows into the corresponding die cavity, the quality of the key caps formed by the corresponding die cavity is more stable and reliable, the flow of the liquid plastic is disturbed and the forming quality is unstable when the key caps are injection molded.
Drawings
FIGS. 1 and 2 are schematic structural views of a key cap;
FIG. 3 is a schematic diagram of the structure of the present invention;
FIG. 4 is a schematic diagram of the upper mold core structure;
FIG. 5 is a schematic view of the structure of FIG. 3 with the upper core and the lifting part removed;
FIG. 6 is a bottom view of the lower mold insert;
FIG. 7 is a cross-sectional view A-A of FIG. 6;
FIG. 8 is an enlarged view of a portion of the guide sleeve of FIG. 7;
FIG. 9 is a schematic diagram of the structure of the present invention;
FIG. 10 is a schematic view of the structure of one rectangular bump in FIG. 9;
FIG. 11 is a schematic view of a molded key cap at the beginning of the lift;
FIG. 12 is a schematic illustration of the connection of one of the tilt pins to a formed key cap;
FIG. 13 is a schematic diagram of the arrangement of the angle pins and the straight pins;
FIG. 14 is a schematic illustration of the connection between the angle pin and the ejector pin;
FIG. 15 is a schematic diagram showing the connection between the upper end of one of the ejector pins and the lower core;
FIG. 16 is a schematic view of the bottom end of the tilt pin being restrained by the bottom plate;
fig. 17 is a schematic view of the end of the angle pin of the first connecting portion forming cavity.
Description of element numbers: the key cap 1, the first connecting part 101, the second connecting part 102, the inclined pin 2, the cylindrical bulge 201, the straight pin 3, the thimble 4, the ejector rod 5, the first groove 501, the lower die core 6, the rectangular convex block 601, the blind hole 602, the slot 603, the runner 604, the main runner 604a, the bypass cavity 605, the inclined pin 2b of the first connecting part forming cavity, the inclined pin 2a of the second connecting part forming cavity, the bottom plate 7, the upper die core 8, the upper die cavity 801, the pouring head 9, the guide sleeve 10, the main water channel 11, the first water channel 12 and the second water channel 13.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
the present embodiment provides a key cap mold for three ejection and demolding in key cap production, as shown in fig. 3-5, which includes an upper mold core 8, a lower mold core 6 and a thimble 4, wherein the upper mold core and the lower mold core are combined to form a mold cavity for molding the key cap 1, and the thimble 4 passes through the lower mold core 6 upwards to eject the molded key cap 1 upwards. The upper surface of the lower die core 6 is provided with a plurality of runners for injection molding of the key cap 1, the runners comprise a main runner 604a and sub-runners which are in I shapes, wherein four ends of the sub-runners are respectively connected with one die cavity, vertical connecting sections of two adjacent sub-runners are communicated and converged at the same end of the main runner 604a, and four ends of the main runner 604a are connected with the two adjacent sub-runners; the upper part of the middle part of the vertical connecting section of the main runner 604a is provided with a filling head 9 communicated with the main runner 604a, liquid plastic is injected into the injection head during injection molding, flows towards the two ends of the main runner 604a through the middle part of the vertical connecting section of the main runner 604a, sequentially enters all the mold cavities symmetrically arranged at the two sides, is simple and reasonable in runner arrangement, and avoids the problem that the injection molding flow is uneven due to the fact that the conventional runners are designed in a complicated and disordered way in order to strive for the molding quantity, so that the mold can mold more key caps 1 at one time, the molding quality of each key cap 1 can be ensured to be stable and reliable as much as possible, after the key caps 1 are molded, the material head formed by the I-shaped runners is ejected for the first time during jacking and demolding, then the molded key caps 1 are jacked out of the mold cores, and finally thorough separation, removal and warehousing of the key caps 1 are realized.
As a specific implementation, in order to fully exert the cooling effect on the basis of the runner layout, to increase the cooling speed to relieve the recovery interval time when the mold works, as shown in fig. 5-8, a plug hole is specially processed in the center of the lower mold core 6, the plug hole vertically penetrates through the upper and lower surfaces of the lower mold core 6 and is used for mounting the guide sleeve 10 coaxially aligned with the pouring head 9 in an embedded manner, a round rod for lifting up is used for penetrating the guide sleeve 10 upwards from the lower part of the lower mold core 6 and does not extend out of the upper port of the guide sleeve 10 when the mold cavity is formed, and a circular flow-around cavity 605 is formed between the guide sleeve 10 and the inner wall of the plug hole when the guide sleeve 10 is embedded in the plug hole; a main water channel 11 horizontally penetrating through the lower die core 6 is arranged under the vertical connecting section of the main channel 604a in parallel with the vertical connecting section, and the main water channel 11 flows through the bypass cavity 605 to bypass the position where the axis of the filling head 9 is located. The design makes it possible that the water channel is cooled on the central axis of the lower die core 6, and the cooling mode of bypass flow can not interfere due to the existence of the pouring head 9, and can still be designed on the central axis of the lower die core 6, thereby greatly improving the cooling efficiency. In a specific implementation, as shown in fig. 3, a first water channel 12 and a second water channel 13 parallel to the main water channel 11 are further provided on the front and rear sides of the interior of the lower mold core 6 to further subvert the design that the conventional water channels exist only around the edges of the mold core, thereby realizing uniform cooling.
As a specific embodiment, as shown in fig. 9-10, the upper surface of the lower mold core 6 is convexly provided with a distance-shaped bump; as shown in fig. 11 and 13, the mold of this embodiment further includes four taper pins 2, the top ends of the taper pins 2 pass through the lower mold core 6 from bottom to top to the upper end surface of the distance-shaped protruding block, the four taper pins 2 form forming cavities for forming the first connecting portion 101 and the second connecting portion 102 at the junctions with the upper end surface of the distance-shaped protruding block, the taper pins 2 are arranged in an inclined manner in the vertical direction, so that the taper pins 2 are convenient to be quickly and stably separated from the formed key cap 1 during jacking and demolding, the efficiency is improved, the taper pins 2 are inserted into the lower mold core 6 in an inclined manner and slide in corresponding inclined holes in the lower mold core 6, so that the sliding action of the taper pins 2 is more stable and reliable compared with the straight pins 3 used directly during ejection, the sliding speed of the taper pins is easier to be controlled, the production efficiency of the key cap 1 can be greatly improved, the molding precision of the key cap 1 is stabilized, and the molding quality of a product is ensured.
During injection molding, the components such as the inclined pin 2 and the like are inserted into the rectangular protruding block 601 of the lower die core 6 and form a lower die cavity together with the rectangular protruding block 601, then the upper die core with the upper die cavity moves downwards, then the upper die core and the lower die core are combined to form a standard die cavity capable of injection molding the key cap 1, plastic liquid flows into the die cavity through the runner 604, and the key cap 1 is obtained through cooling molding; and then after the key cap 1 is obtained after the key cap is formed, the formed key cap 1 is ejected and demoulded by the inclined pin 2, the ejector pin 4 and the like, and compared with the traditional ejection, the vertical ejection of the straight rod-shaped ejector pin 4 is realized by the die in the embodiment, and the inclined pin 2 with a special position is also involved in the ejection and demould.
As a specific embodiment, two pairs of the two taper pins 2 for forming the molding cavity of the first connecting portion 101 and two pairs of the two taper pins 2 for forming the molding cavity of the second connecting portion 102 are respectively arranged in a splayed shape, so that the taper pins 2 can better function and uniformly lift the key cap 1. Meanwhile, in order to better realize the formation of the mold cavity, a special forming structure is designed for the round hole structure of the first connecting portion 101, that is, as shown in fig. 17, a step is formed on the side wall of the top end of the inclined pin 2 forming the first connecting portion 101 toward the outer side of the distance-shaped protruding block, a cylindrical protrusion 201 is formed in the middle of the step surface of the step, so that the first connecting portion 101 forming cavity is formed with the top port of the insertion hole, in which the inclined pin 2 is inserted, on the distance-shaped protruding block, and the cylindrical protrusion 201 is located at the hole opening of the insertion hole, and forms a round hole structure with which the first connecting portion 101 can be formed.
Preferably, in the implementation process, the bottom end of the taper pin 2 is detachably connected with the vertically arranged ejector rod 5 and forms a step part for limiting the upward moving distance of the taper pin 2, namely, a limiting part for limiting the movement of the taper pin 2 is designed, so that the position control of the taper pin 2 for moving and demolding is facilitated, the beneficial effect performance of the taper pin 2 is improved, the key cap 1 is ensured to be stable in ejection, the key cap 1 cannot be lifted vertically due to the traditional single vertical rod body, the key cap 1 is unstable and difficult to control due to instantaneous and violent upward movement, and the key cap cannot be controlled well in the stroke precision. In particular, as shown in fig. 14, the top side wall of the ejector pin 5 and the bottom side wall of the taper pin 2 are provided with a groove in opposite directions, so that the lower part of the side where the groove of the taper pin 2 is located is clamped into the groove (the first groove 501) of the ejector pin 5 to realize snap connection, and the step part is formed by the top end surface of the ejector pin 5 and the side wall of the taper pin 2, so that the upward moving distance of the taper pin 2 can be simply and effectively limited. As shown in fig. 15, a blind hole 602 into which the top end of the ejector rod 5 extends is formed on the bottom end surface of the lower mold core 6, and an insertion slot 603 into which the taper pin 2 is inserted is formed on the inner side wall of the blind hole 602, and the taper pin 2 can pass through the insertion slot 603 and upward reach the upper end surface of the distance-shaped protruding block, so that the step portion controls the upward moving distance of the taper pin 2 to precisely define the ejection distance, and an accurate stroke value is provided between the step portion and the step portion when the step portion is lifted up to form a relatively accurate mold cavity.
As an embodiment, based on the structure of the key cap 1 and the structural position characteristics of the taper pin 2 of the present invention, as shown in fig. 13, the pair of ejector pins 4 are symmetrically arranged between the two pairs of taper pins 2, the top ends of the ejector pins 4 penetrate through the lower mold core 6 from bottom to top and extend to the top end surface of the distance-shaped protruding block, and the side wall of the top end of the ejector pin 4 facing the outer side of the rectangular protruding block 601 is provided with an L-shaped step, and the inner side wall of the L-shaped step and the outer side wall of the rectangular protruding block 601 are connected into a whole for forming the inner side wall of the key cap 1. For stable key cap 1, the jacking of being convenient for, this embodiment still includes the vertical straight round pin 3 of upwards penetrating lower mould benevolence 6 to rectangular lug 601 terminal surface of vertical setting, straight round pin 3 top structure with thimble 4 top structure is unanimous, and this straight round pin 3 lean on two first connecting portion 101 shaping chamber places side settings, and the inside wall of its L type step with the shaping of the corresponding lateral wall of rectangular lug 601 in order to be used for key cap 1 inside wall as an organic whole, the shaping of above-mentioned L type step is when participating in constituting key cap 1 fashioned model chamber, still has a stable holding power to fashioned key cap 1 for the drawing of patterns is more stable.
In particular, on the basis of all the above embodiments, as shown in fig. 16, the present embodiment further includes a bottom plate 7 disposed closely to the lower end surface of the lower mold core, the bottom plate 7 has a through hole through which the ejector pin 5 passes but not through which the taper pin 2 passes, and the bottom end of the taper pin 2 at the top end of the ejector pin 5 passes upward through the through hole, after which the taper pin 2 at the top end can meet the hole edge of the through hole and cannot pass downward through the through hole, that is, the taper pin can only move in the lower mold core 6, for example, can only move in the blind hole 602, that is, limitation of upper and lower limits of travel is achieved, and the taper pin stays due to limitation of the bottom plate when moving downward, that is, the taper pin position is limited, so that the taper pin participates in forming the mold cavity with higher dimensional accuracy.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. The key cap die comprises an upper die core, a lower die core and a thimble, wherein a die cavity for forming the key cap is formed after the upper die core and the lower die core are combined, and the thimble upwards passes through the lower die core to upwards eject the formed key cap; the upper surface of the lower die core is provided with a plurality of runners for injection molding of the keycaps, and the lower die core is characterized in that the runners comprise a main runner and sub runners which are I-shaped, wherein four ends of each sub runner are respectively connected with one die cavity, vertical connecting sections of two adjacent sub runners are communicated and converged at the same end of the main runner, and four ends of each main runner are connected with two adjacent sub runners; a perfusion head communicated with the main runner is arranged above the middle part of the vertical connecting section of the main runner;
the upper surface of the lower die core is convexly provided with a distance-shaped lug; the four inclined pins respectively form forming cavities for forming the first connecting part and the second connecting part at the junctions of the four inclined pins and the upper end surface of the distance-shaped convex block, and the inclined pins are obliquely arranged in the vertical direction;
a step is arranged on the side wall of the top end of the inclined pin forming the first connecting part forming cavity towards the outer side of the distance-shaped convex block, and a cylindrical bulge is arranged in the middle of the step surface of the step so as to form the first connecting part forming cavity with the top port of the jack in the distance-shaped convex block, in which the inclined pin is inserted;
the bottom end of the inclined pin is detachably connected with a vertically arranged ejector rod, and a step part for limiting the moving distance of the inclined pin is formed; the top end side wall of the ejector rod and the bottom end side wall of the inclined pin are provided with grooves in opposite directions, so that the lower part of the side where the grooves of the inclined pin are positioned is clamped into the grooves of the ejector rod to realize engagement connection, and the top end surface of the ejector rod and the side wall of the inclined pin form the step part; a blind hole into which the top end of the ejector rod extends is formed in the bottom end face of the lower die core, a slot into which the inclined pin is inserted is formed in the inner side wall of the blind hole, and the inclined pin can upwards penetrate out to the upper end face of the distance-shaped protruding block through the slot;
the ejector pins are symmetrically arranged between the two pairs of taper pins, the top ends of the ejector pins penetrate through the lower die core from bottom to top and extend to the top end surface of the distance-shaped protruding block, the side wall of the top end of each ejector pin, which faces the outer side of the rectangular protruding block, is provided with an L-shaped step, and the inner side wall of each L-shaped step is connected with the outer side wall of each rectangular protruding block into a whole for forming the inner side wall of the key cap.
2. The three-ejection de-molding key cap mold according to claim 1, wherein: a splicing hole vertically penetrates through the upper surface and the lower surface of the lower die core and is used for being embedded to install a guide sleeve coaxially aligned with the pouring head, a round rod for jacking upwards passes through the guide sleeve to the lower part of the lower die core and does not extend out of an upper port of the guide sleeve when the model cavity is formed, and an annular flow-around cavity is formed between the guide sleeve and the inner wall of the splicing hole when the guide sleeve is embedded into the splicing hole; and a main waterway which horizontally penetrates through the lower die core is arranged under the vertical connecting section of the main runner in parallel with the vertical connecting section, and the main waterway flows through the flow-around cavity to bypass the position where the axis of the filling head is located.
3. The three-ejection de-molding key cap mold according to claim 2, wherein: the front side and the rear side of the interior of the lower die core are respectively provided with a first waterway and a second waterway which are parallel to the main waterway.
4. The three-ejection and demolding key cap mold according to claim 1, wherein two pairs of two taper pins for forming the first connecting portion molding cavity and two taper pins for forming the second connecting portion molding cavity are each arranged in a splayed shape.
5. The three-ejection demolding key cap mold according to claim 1, further comprising a vertically arranged straight pin penetrating through the lower mold core to the top end face of the rectangular bump, wherein the top end structure of the straight pin is consistent with the top end structure of the ejector pin, the straight pin is arranged on the side where the two first connecting part forming cavities are located, and the inner side wall of the L-shaped step of the straight pin is connected with the corresponding outer side wall of the rectangular bump into a whole for forming the inner side wall of the key cap.
6. The three-ejection demolding key cap mold according to claim 1, further comprising a bottom plate which is closely attached to the lower end face of the lower mold core, wherein a through hole is formed in the bottom plate, the ejector rod can pass through but not the inclined pin, the bottom end of the inclined pin at the top end of the ejector rod can be connected with the hole edge of the through hole after the top end of the ejector rod passes through the through hole upwards, and the inclined pin cannot pass through the through hole downwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910317415.4A CN109849279B (en) | 2019-04-19 | 2019-04-19 | Key cap mould of three ejecting drawing of patterns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910317415.4A CN109849279B (en) | 2019-04-19 | 2019-04-19 | Key cap mould of three ejecting drawing of patterns |
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| Publication Number | Publication Date |
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| CN109849279A CN109849279A (en) | 2019-06-07 |
| CN109849279B true CN109849279B (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910317415.4A Active CN109849279B (en) | 2019-04-19 | 2019-04-19 | Key cap mould of three ejecting drawing of patterns |
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| CN110936565A (en) * | 2019-12-04 | 2020-03-31 | 苏州亿源精密模具有限公司 | Short taper pin drawing of patterns key cap's mould |
| CN111730811A (en) * | 2020-06-24 | 2020-10-02 | 深圳市航世科技有限公司 | Common-mode injection mold for keycaps and bottom plate and keyboard production method |
| CN113334692A (en) * | 2021-06-02 | 2021-09-03 | 重庆连成模具有限公司 | Notebook keyboard keycap mold and demolding and ejecting method |
| CN114407292A (en) * | 2022-01-06 | 2022-04-29 | 重庆连成模具有限公司 | Integrative injection structure of multistation of notebook key cap usefulness of moulding plastics |
| CN114770876A (en) * | 2022-01-06 | 2022-07-22 | 重庆连成模具有限公司 | Mold blank ejection connecting mechanism for injection molding of key caps of notebook keyboard |
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