CN107571464A - A kind of multi-direction core-pulling die - Google Patents
A kind of multi-direction core-pulling die Download PDFInfo
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- CN107571464A CN107571464A CN201711005442.5A CN201711005442A CN107571464A CN 107571464 A CN107571464 A CN 107571464A CN 201711005442 A CN201711005442 A CN 201711005442A CN 107571464 A CN107571464 A CN 107571464A
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- 238000000926 separation method Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 6
- 238000001746 injection moulding Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
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Abstract
The present invention relates to multi-direction core-pulling die, by setting sliding block core-pulling mechanism：First, take-up housing and outer side action sliders are connection that can be movable, i.e., during open mold, after take-up housing first departs from initial position certain distance, outer side action sliders are driven by stopping means be stripped again；Secondly, outer side action sliders are provided with secondary core-pulling slide block, and take-up housing is provided with secondary Angle Pin, and the two adaptation forms guide pillar sliding block core-pulling mechanism, realize secondary core pulling die sinking；Mould is more simple, while avoids the problem of failure hits mould, reduces mold failure rate.
Description
Technical Field
The invention belongs to the technical field of mold manufacturing, and particularly relates to a multi-directional core-pulling mold, wherein the center position of a product in a core-pulling direction simultaneously has a core-pulling action perpendicular to the center position.
Background
In the prior art, for complex valve body injection molding part products, the structure is complex, threads or cavities are arranged in multiple directions, an injection mold is often required to have core pulling actions perpendicular to the center position of the core pulling direction of the product, and moving rails of the injection mold are actually crossed.
In the multi-direction core-pulling mold, the action of opening and closing the mold requires that the core pulling in front is completed before entering the next action; therefore, in the conventional design, the core pulling can be realized in a mode of a sliding block and an inclined guide post or in a mode of oil cylinder core pulling and a sliding block.
Referring to fig. 1, the valve body tube 9 is a four-way tube, the valve body tube 9 has a through fluid chamber 91, an open end of the fluid chamber 91 has an inner tube 92 protruding out of the valve body tube 9, and an annular connecting groove is formed on an outer wall surface of the inner tube 92; in the mold opening process of the injection molding part of the valve body pipe 9, firstly, the open end of the fluid cavity 91 needs to be provided with a loose core in the horizontal direction, and the connecting groove of the inner pipe 92 needs to be formed by a core in the vertical direction, so that the mold has three loose core directions: horizontally to the left, vertically up and vertically down.
If adopt slider + oblique guide pillar mode, combine fig. 2 again, this injection mold is used for forming valve body pipe 9 of fig. 1, and it adopts slider + oblique guide pillar mode to come into shape valve body pipe 9, and the slider and the oblique guide pillar that corresponds can not be on same base with the core pulling.
The fixed die is provided with an A plate 3 and a first loose core 30 penetrating through the A plate 3; the movable mold is provided with a movable mold plate 1 and a material pushing plate 2, and a second loose core 10 is arranged on the movable mold plate 1 and penetrates through the material pushing plate 2; the third loose core 4 is movably arranged on the material pushing plate 2, and correspondingly, an inclined guide post 31 capable of being inserted into the third loose core 4 is arranged on the A plate 3; thereby forming three groups of core-pulling mechanisms with different directions. The mould requires that the movement sequence of the three core-pulling mechanisms is returned according to a specific sequence, namely the original path, so that a set of control mechanism is required to ensure the mould opening sequence of the mould. The mold is thus complicated.
In other implementation modes, the motion sequence control can be realized by using the oil cylinder, but the oil cylinder has the typical characteristics that the speed-time curve is difficult to control, the instantaneous speed is high, and the stroke is difficult to accurately control. Which ultimately depends essentially on the inductive switch. And problems will follow when the inductive switch is faulty or inaccurate. The mold cannot be opened when the weight is light, and the slide blocks are damaged when the weight is heavy.
Therefore, the mechanical structure is continuously used for replacing the electronic structure, and the mold opening and closing and core pulling sequence is realized, so that the service life of the mold is prolonged.
Disclosure of Invention
The invention aims to provide a multi-direction core-pulling mold, which solves the problems of complex sequential control mechanism, low control precision and high mold failure rate of the existing multi-axial core-pulling mold.
The specific scheme is as follows: a multi-direction core-pulling mold comprises a movable mold, a fixed mold and a sliding block core-pulling mechanism, wherein the sliding block core-pulling mechanism can be movably arranged on the movable mold or the fixed mold; the sliding block core-pulling mechanism comprises a sliding block seat and an outer core-pulling sliding block arranged on the sliding block seat; the outer core-pulling sliding block is movably arranged on the sliding block seat through a limiting device; a spring for separating the sliding block seat and the outer core-pulling sliding block is also arranged between the sliding block seat and the outer core-pulling sliding block; the sliding block core pulling mechanism is also provided with a secondary core pulling device, the secondary core pulling device comprises a secondary core pulling sliding block and a secondary inclined guide post matched with the secondary core pulling sliding block, the secondary inclined guide post is fixed on the sliding block seat, and the secondary core pulling sliding block can be movably arranged on the outer core pulling sliding block; and in a mold closing state, the secondary inclined guide post is inserted in the secondary core-pulling slide block so as to drive the secondary core-pulling slide block to move relative to the outer core-pulling slide block when the slide block seat is separated from the outer core-pulling slide block.
Further, the demolding moving direction of the secondary core-pulling sliding block is perpendicular to the demolding moving direction of the outer core-pulling sliding block.
Furthermore, a central core pulling is arranged on the slider seat, and the secondary inclined guide post comprises a lower inclined guide post and an upper inclined guide post which are respectively arranged on the upper side and the lower side of the central core pulling; correspondingly, the secondary core-pulling sliding block comprises an upper core-pulling sliding block and a lower core-pulling sliding block which are arranged up and down.
Further, one end of the sliding block core pulling mechanism, which is away from the die surface, is defined as a lower end, and a supporting block is further arranged at the lower end of the sliding block core pulling mechanism; the supporting block is fixed on the sliding block seat, and in a die closing state, the supporting block protrudes to the lower part of the lower core-pulling sliding block.
Furthermore, the tail end of the supporting block is provided with a supporting inclined plane which is parallel to the inclined direction of the lower inclined guide post; correspondingly, the bottom end of the lower core-pulling slide block is parallel to the supporting inclined plane and inclines.
Furthermore, the sliding block core-pulling mechanism is arranged on the movable die, and a primary inclined guide pillar is arranged on the fixed die corresponding to the sliding block seat;
or,
the sliding block core pulling mechanism can be movably arranged on the movable die or the fixed die, a core pulling oil cylinder is arranged on the movable die or the fixed die, and a piston rod of the core pulling oil cylinder is connected to the sliding block seat.
Furthermore, the limiting device comprises a limiting bolt, and the limiting bolt penetrates through the sliding block seat and is screwed and installed on the outer core-pulling sliding block; the limiting bolt can move in a limited stroke relative to the sliding block seat, so that the outer core-pulling sliding block can be movably arranged on the sliding block seat.
Further, this spring is pressure spring, and this slider seat forms a spring installation cavity with the cooperation of this outside slider of loosing core, and this pressure spring is located this spring installation cavity to exert an effort of keeping away from the slider seat to this outside slider of loosing core, realize the separation of the two.
The multi-direction core-pulling die is provided with the sliding block core-pulling mechanism: firstly, the sliding block seat and the outer core-pulling sliding block are movably connected, namely in the mold opening and closing process, the sliding block seat is separated from the initial position for a certain distance, and then the outer core-pulling sliding block is driven by the limiting device to be demolded; secondly, a secondary core-pulling sliding block is arranged on the outer core-pulling sliding block, a secondary inclined guide post is arranged on the sliding block seat, and the secondary inclined guide post are matched to form a guide post-sliding block core-pulling mechanism, so that secondary core-pulling die opening is realized; preferably, the secondary core-pulling sliding blocks which are inserted in a cross mode are arranged in the core-pulling sliding blocks at the outer sides, multi-direction die opening and core pulling in the vertical direction and the horizontal direction are achieved, original parts such as a material pushing plate, a sequence control mechanism, a time schedule controller and the like are omitted, and the die is simpler; meanwhile, even if the lateral core-pulling slider does not act in place, the slider inclined plane of the fixed die can be sleeved with the lateral core-pulling slider, and the lateral core-pulling slider can continue to act and finally safely mold closing is realized because the inclined plane angle of the slider is larger than that of the secondary core-pulling slider. That is, the action distance of the oil cylinder can have a larger range; or the secondary inclined guide post is supposed to be damaged, and finally, the product is just pulled to be damaged, so that the problem of die collision due to faults is avoided, and the failure rate of the die is reduced.
Drawings
FIG. 1 shows a schematic view of a prior art valve body tube configuration;
FIG. 2 shows a partial cross-sectional view of a prior art valve body tube injection mold;
FIG. 3 is a schematic structural diagram of a connecting oil cylinder of the sliding block core pulling mechanism according to the embodiment of the invention;
FIG. 4 shows a schematic view of the structure of FIG. 3 from another perspective;
FIG. 5 shows a cross-sectional view of a secondary core pulling device of a slider core pulling mechanism according to an embodiment of the invention;
FIG. 6 shows a cross-sectional view of a slider core pulling mechanism stop device in accordance with an embodiment of the present invention;
FIG. 7 shows an exploded front view of a slider core pulling mechanism according to an embodiment of the present invention;
fig. 8 shows an exploded view of a slider core-pulling mechanism according to an embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
Referring to fig. 3, the embodiment provides a multi-directional core pulling mold, which includes a movable mold (not shown), a fixed mold (not shown), and a slider core pulling mechanism 5, wherein the slider core pulling mechanism 5 may be movably disposed on the movable mold.
With reference to fig. 5 and 6, the slider core-pulling mechanism 5 includes a slider seat 51 and an outer core-pulling slider 52 movably mounted on the slider seat 51; the outer core-pulling slider 52 is movably mounted on the slider seat 51 through a limiting device, specifically, the limiting device is a limiting bolt, a through hole 511 with a contracted aperture is arranged on the slider seat 51, the through hole has a step-shaped contracted aperture, one end of the through hole, which is far away from the outer core-pulling slider 52, is slightly larger than the protruding tail part of the limiting bolt, the other end of the through hole is adapted to the screw part of the limiting bolt, and the screw part of the limiting bolt penetrates through the slider seat 51 through the through hole 511 and then is screwed on the outer core-pulling slider 52; the tail of the limit bolt is disposed in the through hole 511, and further, the limit bolt can move with a limited stroke relative to the slider seat 51, so that the outer core-pulling slider 52 can be movably mounted on the slider seat 51.
A compression spring for separating the slider seat 51 and the outer core-pulling slider 52 is also arranged between the slider seat and the outer core-pulling slider: this slider seat 51 forms a spring installation cavity 512 with this outside slider 52 of loosing core cooperation, and this pressure spring is located in this spring installation cavity 512, and its both ends are contradicted respectively in slider seat 51 and outside slider 52 of loosing core to exert an effort of keeping away from slider seat 51 to this outside slider 52 of loosing core, realize the separation of the two.
Preferably, in order to simplify the processing, the slider seat 51 is provided with a fixed plate 510, one end of the spring installation cavity 512 is arranged on the fixed plate 510, and the narrow hole section of the through hole 511 is arranged on the fixed plate 510; the through hole 511 and the spring mounting cavity 512 are parallel to the mold opening moving direction of the outer core-pulling slider 52.
In this embodiment, the fixing plate 510 is a rectangular plate, and the number of the spring mounting cavities 512 is four, which are disposed near four corners of the fixing plate 510; the number of the through holes 511 is four, and the through holes 511 are opened at positions corresponding to the centers of the four edges of the fixing plate 510.
As shown in fig. 3 to 8, the slider core-pulling mechanism 5 is further provided with a secondary core-pulling device, and the secondary core-pulling device is upward in a direction toward the fixed mold, and the secondary core-pulling device includes two secondary core-pulling sliders and two secondary inclined guide pillars, the two secondary inclined guide pillars are correspondingly fixed on the fixed plate 510, and one inclined guide pillar is correspondingly inserted into one secondary core-pulling slider, so as to form a secondary slider-guide pillar core-pulling mechanism disposed in the slider core-pulling mechanism 5.
Specifically, two this secondary oblique guide posts are last oblique guide post 513 and lower oblique guide post 514 that set up from top to bottom respectively, should go up oblique guide post 513 and lower oblique guide post 514 and all locate on this fixed plate 510, then pass through the pin location and fixed mounting again on this slider seat 51 by this fixed plate 510, this kind of fixed mode, its cooperation precision is high, processing technology is simple, and maintenance easy dismounting. In this embodiment, the upper inclined guide pillar 513 extends obliquely upward toward the injection molding part, and correspondingly, the lower inclined guide pillar 513 extends obliquely downward toward the injection molding part, so as to form two core pulling directions which are away from each other.
The two secondary core-pulling sliding blocks are an upper core-pulling sliding block 53 and a lower core-pulling sliding block 54 which are arranged up and down respectively, a vertically extending and vertically through mounting hole is formed in the outer core-pulling sliding block 52, and the upper core-pulling sliding block 53 and the lower core-pulling sliding block 54 are movably mounted in the mounting hole and are further arranged on the outer core-pulling sliding block 52.
Correspondingly, the upper core-pulling slider 53 and the lower core-pulling slider 54 are respectively provided with an inclined guide post hole, in a mold closing state, the inclined sections of the upper inclined guide post 513 and the lower inclined guide post 514 are respectively inserted into the upper core-pulling slider 53 and the lower core-pulling slider 54, so that when the slider seat 51 is separated from the outer core-pulling slider 52, the two secondary core-pulling sliders are driven to move relative to the outer core-pulling slider 52, the upper core-pulling slider 53 vertically upwards pulls cores, and the lower core-pulling slider 54 vertically pulls cores downwards.
In this embodiment, the mounting hole vertically penetrates the outer core back slide 52, and further, in the mold clamping state, the upper core back slide 53 is pressed by the fixed mold, so that the mold clamping position is locked and fixed. In order to realize the locking and fixing of the mold closing position of the lower core-pulling slide block 54, the lower end of the slide block core-pulling mechanism 5 is also provided with a supporting block 55: the supporting block 55 is fixed on the slider seat 51, and in a mold closing state, the free end of the supporting block 55 protrudes below the lower core back slider 54, wherein preferably, the upper side of the free end of the supporting block 55 has a supporting inclined plane extending obliquely, the supporting inclined plane is parallel to the oblique direction of the lower oblique guide pillar 514, and the bottom end of the lower core back slider 54 is inclined parallel to the supporting inclined plane, so as to support and fix the lower core back slider 54.
In this embodiment, the demolding moving direction of the upper core-pulling slider 53 and the lower core-pulling slider 54 in the secondary core-pulling slider is perpendicular to the demolding moving direction of the outer core-pulling slider 52; and a central core pulling 56 extending along the demoulding moving direction of the outer core pulling slide block 52 is also arranged on the slide block seat 51, and the upper core pulling slide block 53 and the lower core pulling slide block 54 are respectively arranged at the upper side and the lower side of the central core pulling 56. Similarly, the central core 56 and the supporting block 55 are mounted on the slider holder 51 through the fixing block 510.
Due to the fact that the built-in slider-inclined guide post core pulling mechanism is adopted, the size design of the inclined guide post is limited, in order to achieve the best fixing effect, guide post holes in the upper core pulling slider 53 and the lower core pulling slider 54 are arranged in a penetrating mode, in addition, jacks are further arranged on the outer side core pulling slider 52 corresponding to the tail ends of the guide post holes in the mold closing state, insertion blocks extending along the moving direction of the slider seat 51 are arranged at the tail ends of the upper inclined guide post 513 and the lower inclined guide post 514, the insertion blocks are correspondingly inserted into the jacks, and the end portions of the upper inclined guide post 513 and the lower inclined guide post 514 are fixed.
In this embodiment, the sliding block core pulling mechanism 5 can be movably disposed on the movable mold, and a core pulling cylinder 6 is disposed on the movable mold, and a piston rod of the core pulling cylinder 6 is connected to the sliding block seat 51, so as to drive the sliding block core pulling mechanism 5. It is understood that in other embodiments, an oil cylinder element can be eliminated, and specifically, the slider core-pulling mechanism is disposed on the movable mold, and a primary inclined guide post is disposed on the fixed mold corresponding to the slider seat, so as to form a primary slider-guide post core-pulling mechanism for driving the slider core-pulling mechanism 5.
The working process of this embodiment is as follows:
a: opening the injection molding machine, and separating a fixed template on the fixed mold from a movable template on the movable mold; the top end of the upper core-pulling slide block 53 is released;
b: the core-pulling oil cylinder 6 acts, the slide block seat 51 moves outwards, and meanwhile, the central core-pulling 56 is driven to move outwards; the slide block seat 51 synchronously drives the upper inclined guide post 513 and the lower inclined guide post 514 to continuously move to act on the upper core pulling slide block 53 and the lower core pulling slide block 54; meanwhile, the supporting block 55 moves outwards synchronously, the lower core-pulling slide block 54 is not supported any more, and the upper end surface of the upper core-pulling slide block 53 is not supported any more due to the separation of the fixed die, so that the upper and lower core-pulling slide blocks move upwards and downwards synchronously and are finally separated from the product;
in the process, the outer core-pulling slide block 52 is separated from the slide block seat 51 under the action of the holding force of the built-in compression spring and the front-end product, and the secondary core-pulling device does not act and continues to stay at the original position;
c: after the upper core pulling slide block 53 and the lower core pulling slide block 54 are separated, the outer core pulling slide block 52 moves outwards together with the slide block seat 51 under the action of the limiting screw rod until the end position. And opening the die of the outer core-pulling slide block 52.
D: and (5) ejecting the product.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A multi-direction core-pulling mold comprises a movable mold, a fixed mold and a sliding block core-pulling mechanism, wherein the sliding block core-pulling mechanism can be movably arranged on the movable mold or the fixed mold; the sliding block core-pulling mechanism comprises a sliding block seat and an outer core-pulling sliding block arranged on the sliding block seat; the method is characterized in that:
the outer core-pulling sliding block is movably arranged on the sliding block seat through a limiting device;
a spring for separating the sliding block seat and the outer core-pulling sliding block is also arranged between the sliding block seat and the outer core-pulling sliding block;
the sliding block core pulling mechanism is also provided with a secondary core pulling device, the secondary core pulling device comprises a secondary core pulling sliding block and a secondary inclined guide post matched with the secondary core pulling sliding block, the secondary inclined guide post is fixed on the sliding block seat, and the secondary core pulling sliding block can be movably arranged on the outer core pulling sliding block;
and in a mold closing state, the secondary inclined guide post is inserted in the secondary core-pulling slide block so as to drive the secondary core-pulling slide block to move relative to the outer core-pulling slide block when the slide block seat is separated from the outer core-pulling slide block.
2. The multi-directional core pulling mold according to claim 1, wherein: the demoulding moving direction of the secondary core-pulling sliding block is perpendicular to the demoulding moving direction of the outer core-pulling sliding block.
3. The multi-directional core pulling mold according to claim 1, wherein: the slider seat is also provided with a central core pulling device, and the secondary inclined guide post comprises a lower inclined guide post and an upper inclined guide post which are respectively arranged at the upper side and the lower side of the central core pulling device; correspondingly, the secondary core-pulling sliding block comprises an upper core-pulling sliding block and a lower core-pulling sliding block which are arranged up and down.
4. The multi-directional core pulling mold of claim 3, wherein: defining one end of the sliding block core-pulling mechanism, which is away from the die surface, as a lower end, and arranging a supporting block at the lower end of the sliding block core-pulling mechanism; the supporting block is fixed on the sliding block seat, and in a die closing state, the supporting block protrudes to the lower part of the lower core-pulling sliding block.
5. The multi-directional core pulling mold of claim 4, wherein: the tail end of the supporting block is provided with a supporting inclined plane which is parallel to the inclined direction of the lower inclined guide post; correspondingly, the bottom end of the lower core-pulling slide block is parallel to the supporting inclined plane and inclines.
6. The multi-directional core pulling mold according to claim 1, wherein: the sliding block core-pulling mechanism is arranged on the movable die, and a primary inclined guide pillar is arranged on the fixed die corresponding to the sliding block seat;
or,
the sliding block core pulling mechanism can be movably arranged on the movable die or the fixed die, a core pulling oil cylinder is arranged on the movable die or the fixed die, and a piston rod of the core pulling oil cylinder is connected to the sliding block seat.
7. The multi-directional core pulling mold according to claim 1, wherein: the limiting device comprises a limiting bolt, and the limiting bolt penetrates through the sliding block seat and is screwed on the outer core-pulling sliding block; the limiting bolt can move in a limited stroke relative to the sliding block seat, so that the outer core-pulling sliding block can be movably arranged on the sliding block seat.
8. The multi-directional core pulling mold according to claim 1, wherein: the spring is a compression spring, the sliding block seat and the outer side core-pulling sliding block are matched to form a spring installation cavity, and the compression spring is arranged in the spring installation cavity so as to apply an acting force far away from the sliding block seat to the outer side core-pulling sliding block and realize the separation of the compression spring and the outer side core-pulling sliding block.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711005442.5A CN107571464B (en) | 2017-10-25 | 2017-10-25 | Multidirectional core-pulling mold |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711005442.5A CN107571464B (en) | 2017-10-25 | 2017-10-25 | Multidirectional core-pulling mold |
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| CN107571464A true CN107571464A (en) | 2018-01-12 |
| CN107571464B CN107571464B (en) | 2024-05-10 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109093953A (en) * | 2018-10-12 | 2018-12-28 | 中山市利群精密实业有限公司 | A kind of plastic cement products back-off multidirectional demoulding mechanism of nozzle |
| CN109822836A (en) * | 2019-01-31 | 2019-05-31 | 浙江工商职业技术学院 | A kind of the resigning core-drawing demoulding mechanism and its release method of injection molding |
| CN110815748A (en) * | 2019-12-05 | 2020-02-21 | 东莞市嘉宏机电科技有限公司 | Internal-shrinkage core-pulling injection mold of planar four-way joint |
| CN111267306A (en) * | 2020-03-23 | 2020-06-12 | 漳州盈塑工业有限公司 | Can mould plastics and have mould that corresponds inner groovy injection molding |
| CN114074409A (en) * | 2020-08-21 | 2022-02-22 | 苏州汉扬精密电子有限公司 | Core-pulling demoulding structure of inclined hollow convex column |
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| CN109093953A (en) * | 2018-10-12 | 2018-12-28 | 中山市利群精密实业有限公司 | A kind of plastic cement products back-off multidirectional demoulding mechanism of nozzle |
| CN109093953B (en) * | 2018-10-12 | 2020-05-19 | 中山市利群精密实业有限公司 | Multidirectional demoulding mechanism for plastic product back-off pipe orifice |
| CN109822836A (en) * | 2019-01-31 | 2019-05-31 | 浙江工商职业技术学院 | A kind of the resigning core-drawing demoulding mechanism and its release method of injection molding |
| CN110815748A (en) * | 2019-12-05 | 2020-02-21 | 东莞市嘉宏机电科技有限公司 | Internal-shrinkage core-pulling injection mold of planar four-way joint |
| CN110815748B (en) * | 2019-12-05 | 2021-05-11 | 宁海县德高精密模具有限公司 | Internal-shrinkage core-pulling injection mold of planar four-way joint |
| CN111267306A (en) * | 2020-03-23 | 2020-06-12 | 漳州盈塑工业有限公司 | Can mould plastics and have mould that corresponds inner groovy injection molding |
| CN114074409A (en) * | 2020-08-21 | 2022-02-22 | 苏州汉扬精密电子有限公司 | Core-pulling demoulding structure of inclined hollow convex column |
| CN114074409B (en) * | 2020-08-21 | 2023-11-14 | 苏州汉扬精密电子有限公司 | Core-pulling demoulding structure of inclined hollow convex column |
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| CN107571464B (en) | 2024-05-10 |
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