CN109434066B - Mold and mold design method - Google Patents
Mold and mold design method Download PDFInfo
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- CN109434066B CN109434066B CN201811262002.2A CN201811262002A CN109434066B CN 109434066 B CN109434066 B CN 109434066B CN 201811262002 A CN201811262002 A CN 201811262002A CN 109434066 B CN109434066 B CN 109434066B
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- mold
- determining
- die
- gravity center
- cavity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
Abstract
A mold and a mold design method are used for injection molding of parts and structures of electronic products, including smart phones, notebook computers, walkmans, digital cameras, wearable devices and other handheld devices, wherein the position of an injection port of the mold can increase the fluidity of molten metal in narrow channels in semi-solid injection molding when a plurality of narrow channels exist in a mold cavity, so that the quality and the performance of an injection molding element are improved.
Description
Technical Field
The invention relates to the technical field of semi-solid alloy injection molding, in particular to a semi-solid alloy injection molding die and a die design method.
Background
With the development of the electronic industry, the light weight of products is required to be higher and higher, and the products comprise smart phones, notebook computers, walkmans, digital cameras, wearable devices and other handheld devices. The parts and structures of these electronic products are thin in wall thickness, and are often complex in shape and long in flow distance. It is important for parts and structures of complex shape to be as lightweight as possible, while also requiring sufficient strength, good heat dissipation, and resistance to electromagnetic interference.
The market for materials used to make various 3C electronic housings and parts has been completely monopolized by injection-molded plastics, however, because the modulus of plastics is lower than that of metals, the structural properties of plastic products obtained by conventional injection molding methods are difficult to meet the requirements of electronic products. Compared with plastics, the magnesium alloy part not only has metallic luster and texture, but also has higher rigidity without buckling deformation and bubbles, pockmarks or dimples. Although magnesium has a higher specific gravity than plastic, it has much higher specific strength, impact resistance and stiffness than plastic, and allows for the manufacture of lighter and thinner parts.
The semi-solid injection molding technology uses the injection molding principle in the metal molding process, is a technology for melting low-melting-point alloy and injecting raw materials into a metal mold at high speed and high pressure for molding, adopts an integrated molding mode, combines the die casting process and the injection process into a whole, and has the advantages that the mold and the molding material are similar to the semi-solid die casting process, and the technological process is close to the injection molding.
Under the condition of room temperature, the granular magnesium alloy raw material is forcibly conveyed into a charging barrel by a hopper, and alloy granules move to a die by a rotating spiral body in the charging barrel; when the alloy particles pass through the heating part of the charging barrel, the alloy particles are in a semi-solid state; the material is pressed into a preheating mould at high speed under the action of an injection cylinder for forming.
In semi-solid injection molding, for parts with a long flow distance, the magnesium alloy tends to solidify quickly, due to its low heat capacity, affecting the filling of the mold cavity and the quality of the final part. In order to solve the above problems, in the prior art, a plurality of injection ports may be disposed on opposite surfaces or side surfaces, and injection molding of a part having a large flow length ratio may be achieved by simultaneously injecting a semi-solid metal material into a mold through the plurality of injection ports. However, since the fluidity of the molten metal is lowered due to the increase in surface tension when the molten metal is in the lane, if the lane in the part is located at a relatively long distance from the injection port, the temperature of the molten metal is lower than the temperature of the injection port when the molten metal passes through the lane and the increase in surface tension causes solidification thereof to stop flowing, which affects the molding quality.
In order to increase the fluidity of the molten metal in the narrow channel in the semi-solid injection molding and improve the quality and performance of the injection molding component, an improved technical proposal is provided, wherein the position of an injection port is arranged according to the position of the region with the lowest longitudinal height in a cavity, so that the injected molten metal can pass through the narrow channel before being cooled, and the flow can not be solidified and stopped. However, when there are multiple narrow channels in the mold cavity, the injection port may be far from the narrow channels, which affects the molding quality.
Disclosure of Invention
The invention provides a mold and a mold injection molding process, which can increase the fluidity of molten metal in narrow channels in semi-solid injection molding when a plurality of narrow channels exist in a cavity, thereby improving the quality and performance of an injection molding element.
As an aspect of the present invention, there is provided a mold designing method including the steps of: (1) determining the structures of an upper die holder and a lower die holder according to the shape of the workpiece; (2) determining the shape of a die cavity according to the structures of an upper die holder and a lower die holder; (3) determining the area with the lowest longitudinal height in the cross section of the mold cavity according to the front view and the left view or the right view of the mold cavity shape; (4) judging whether the area with the lowest longitudinal height in the cross section of the die cavity is a single-communication area or not, and if so, entering the step (5); otherwise, entering the step (6); (5) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, and determining the distances between the gravity center position and the four side surfaces of the movable die base; (5.1) determining the side face with the shortest distance between the gravity center position and the four side faces of the movable mold base, and arranging a first injection port at the projection position of the gravity center position on the side face; (5.2) determining an intersection of the first injection port with the shape of the mold cavity; (5.3) calculating a point with the farthest distance between the edge of the die cavity shape and the intersection point, determining a side face with the shortest distance between the movable die holder and the point, arranging a second injection port at the projection position of the point on the side face, and finishing the arrangement of the injection ports of the die; (6) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, calculating the shortest distance between the gravity center position and each sub-area of the area with the lowest longitudinal height, judging whether the maximum value of each shortest distance is smaller than a threshold value, if so, entering the step (5), otherwise, entering the step (7); (7) and dividing the region with the lowest longitudinal height into a plurality of single-communication subregions, and respectively arranging corresponding injection ports for the single-communication subregions.
Preferably, in the step (7), for the gravity center of each single-communication sub-region, a side surface having the shortest distance to the four side surfaces of the movable mold base is determined, and the gravity center position is provided with a corresponding injection port at the projection position of the side surface.
Preferably, the threshold is 1/5 of the long side of the cross section of the upper die base.
As another aspect of the present invention, there is provided a mold designed by the above mold design method for preparing an injection molded workpiece, comprising: a fixed die holder and a movable die holder; the inner space of the fixed die base and the movable die base after die assembly forms a die cavity; the mould cavity has sections with different longitudinal heights; the side surface of the mold cavity is provided with two injection ports or a plurality of injection ports for injecting molding materials into the mold cavity.
FIG. 1 is a flow chart of the steps of a mold design method of an embodiment of the present invention.
FIG. 2 is a multi-angle view of a mold cavity of a mold of an embodiment of the present invention with a single communication zone.
FIG. 3 is a multi-angle view of a mold cavity of a mold of an embodiment of the invention, not a single communication zone.
Detailed Description
In order to more clearly illustrate the technical solutions of the present invention, the present invention will be briefly described below by using embodiments, and it is obvious that the following description is only one embodiment of the present invention, and for those skilled in the art, other technical solutions can be obtained according to the embodiments without inventive labor, and also fall within the disclosure of the present invention.
The mold provided by the embodiment of the invention is used for preparing parts and structures in the electronic industry through injection molding, and comprises a smart phone, a notebook computer, a walkman, a digital camera, wearable equipment and other handheld equipment. The die comprises a fixed die seat and a movable die seat, a die cavity is formed in the inner space of the fixed die seat and the movable die seat after the fixed die seat and the movable die seat are closed, an injection port is formed in the die, and the magnesium alloy in a molten state is injected into the die through the injection port by a semi-solid injection molding technology and then is molded. The die cavity is provided with sections with different longitudinal heights, wherein the height of a region with the minimum longitudinal height is less than 0.5mm, when the molten magnesium alloy is in a narrow passage, the fluidity of the molten magnesium alloy is reduced due to the increase of the surface tension, the solidification of the molten magnesium alloy is stopped, and the forming quality is affected.
A mold designing method according to an embodiment of the present invention, referring to fig. 1, includes the steps of: (1) determining the structures of an upper die holder and a lower die holder according to the shape of the workpiece; (2) determining the shape of a die cavity according to the structures of an upper die holder and a lower die holder; (3) determining the area with the lowest longitudinal height in the cross section of the mold cavity according to the front view and the left view or the right view of the mold cavity shape; (4) judging whether the area with the lowest longitudinal height in the cross section of the die cavity is a single-communication area or not, and if so, entering the step (5); otherwise, entering the step (6); (5) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, and determining the distances between the gravity center position and the four side surfaces of the movable die base; (5.1) determining the side face with the shortest distance between the gravity center position and the four side faces of the movable mold base, and arranging a first injection port at the projection position of the gravity center position on the side face; (5.2) determining an intersection of the first injection port with the shape of the mold cavity; (5.3) calculating a point with the farthest distance between the edge of the die cavity shape and the intersection point, determining a side face with the shortest distance between the movable die holder and the point, arranging a second injection port at the projection position of the point on the side face, and finishing the arrangement of the injection ports of the die; (6) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, calculating the shortest distance between the gravity center position and each sub-area of the area with the lowest longitudinal height, judging whether the maximum value of each shortest distance is smaller than a threshold value, if so, entering the step (5), otherwise, entering the step (7); (7) and dividing the region with the lowest longitudinal height into a plurality of single-communication subregions, and respectively arranging corresponding injection ports for the single-communication subregions.
In the step (1), the shape of a workpiece is input through a human-computer interaction interface of the system, and the structures of an upper die base and a lower die base of the die are determined according to the shape of the workpiece; the upper die holder is a movable die holder, and the lower die holder is a fixed die holder.
In step (2), the shape of the mold cavity is determined according to the structures of the upper mold base and the lower mold base, see the view of the mold cavity shape in fig. 2.
In the step (3), the area with the lowest longitudinal height in the cross section of the die cavity is determined according to the front view and the left view or the right view of the shape of the die cavity. Referring to fig. 2 (b) and 3 (b), the horizontal X-axis coordinate of the region 10 (10 ') of lowest longitudinal height in the cross-section of the cavity is determined by the front view of the cross-section of the cavity, and the horizontal Y-axis coordinate of the region 10 (10') of lowest longitudinal height in the cross-section of the cavity is determined by the right view of the cross-section of the cavity, referring to fig. 2 (c) and 3 (c).
In the step (4), judging whether the region with the lowest longitudinal height in the cross section of the die cavity is a single-connection region or not, and if the region is the single-connection region, as shown in fig. 2, entering the step (5); otherwise, as shown in fig. 3, step (6) is entered.
In the step (5), according to the top view of the die cavity shape, the gravity center position of the area with the lowest longitudinal height is determined, and the distances between the gravity center position and the four side surfaces of the movable die base are determined. Referring to fig. 2 (a), according to the top view of the cavity shape, the gravity center position 11 of the region 10 with the lowest longitudinal height in the cavity cross section is determined, and further the distances between the gravity center position 11 and the four side surfaces of the movable mold base are determined.
In the step (5.1), according to the distances between the gravity center position 11 determined in the step (5) and the four side surfaces of the movable mold base, the side surface of the movable mold base closest to the gravity center position 11 is determined, the side surface is selected as the side surface where the first injection port is located, and the first injection port is arranged at the projection position of the gravity center position 11 on the side surface, so that the molten magnesium alloy injected from the first injection port can be closest to the region with the lowest longitudinal height, and the fluidity in the narrow passage can be increased.
In the step (5.2), according to the position of the first injection port determined in the step (5.1), an intersection point 12 of the first injection port and the shape of the mold cavity is determined, and the intersection point 12 is the position where the molten magnesium alloy is input into the mold cavity.
In the step (5.3), according to the position of the intersection point 12 calculated in the step (5.2), calculating a point 13 of the edge of the die cavity shape, which is farthest away from the intersection point 12, determining a side face of the movable die holder, which is shortest from the point 13, and setting a second injection port at the projection position of the point 13 on the side face. Since the injection position point 13 of the second injection port is farthest away from the injection position point of the first injection position point 12, the flow distance of the injected molten magnesium alloy can be reduced, and the molten magnesium alloy is prevented from being solidified to influence the molding quality.
In the step (6), according to the top view of the shape of the mold cavity, referring to fig. 3 (a), determining the gravity center position 11 of the region with the lowest longitudinal height, calculating the shortest distance between the gravity center position 11 and each sub-region of the region with the lowest longitudinal height, judging whether the maximum value of each shortest distance is smaller than a threshold value, if so, indicating that the flow distance of the molten magnesium alloy injected from the first injection port determined by the gravity center position to the narrow passage meets the requirement, entering the step (5) and the subsequent flow path, and determining the first injection port and the second injection port; otherwise, go to step (7).
In the step (7), the region 10, 10' with the lowest longitudinal height is divided into a plurality of single communicating sub-regions, and corresponding injection ports are respectively arranged for the single communicating sub-regions. And for the gravity center of each single-communication sub-region, determining the side face with the shortest distance to the four side faces of the movable mold base, and arranging the gravity center position at the projection position of the side face to form a corresponding injection port.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and are intended to be within the scope of the invention.
Claims (3)
1. A method of mold design comprising the steps of: (1) determining the structures of an upper die holder and a lower die holder according to the shape of the workpiece; (2) determining the shape of a die cavity according to the structures of an upper die holder and a lower die holder; (3) determining the area with the lowest longitudinal height in the cross section of the mold cavity according to the front view and the left view or the right view of the mold cavity shape; (4) judging whether the area with the lowest longitudinal height in the cross section of the die cavity is a single-communication area or not, and if so, entering the step (5); otherwise, entering the step (6); (5) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, and determining the distances between the gravity center position and the four side surfaces of the movable die base; (5.1) determining the side face with the shortest distance between the gravity center position and the four side faces of the movable mold base, and arranging a first injection port at the projection position of the gravity center position on the side face; (5.2) determining an intersection of the first injection port with the shape of the mold cavity; (5.3) calculating a point with the farthest distance between the edge of the die cavity shape and the intersection point, determining a side face with the shortest distance between the movable die holder and the point, arranging a second injection port at the projection position of the point on the side face, and finishing the arrangement of the injection ports of the die; (6) according to the top view of the die cavity shape, determining the gravity center position of the area with the lowest longitudinal height, calculating the shortest distance between the gravity center position and each sub-area of the area with the lowest longitudinal height, judging whether the maximum value of each shortest distance is smaller than a threshold value, if so, entering the step (5), otherwise, entering the step (7); (7) dividing the region with the lowest longitudinal height into a plurality of single-communication sub-regions, and respectively arranging corresponding injection ports for the single-communication sub-regions; and for the gravity center of each single-communication subarea, determining the side face with the shortest distance with the four side faces of the movable mold base, and arranging the gravity center position at the projection position of the side face to form a corresponding injection port.
2. The mold design method according to claim 1, characterized in that: the threshold is 1/5 of the long side of the cross section of the upper die base.
3. A mold designed according to the mold design method of claim 1, for preparing an injection molded workpiece, comprising: a fixed die holder and a movable die holder; the inner space of the fixed die base and the movable die base after die assembly forms a die cavity; the mould cavity has sections with different longitudinal heights; the side surface of the mold cavity is provided with two injection ports or a plurality of injection ports for injecting molding materials into the mold cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811262002.2A CN109434066B (en) | 2018-10-27 | 2018-10-27 | Mold and mold design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811262002.2A CN109434066B (en) | 2018-10-27 | 2018-10-27 | Mold and mold design method |
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| Publication Number | Publication Date |
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| CN109434066A CN109434066A (en) | 2019-03-08 |
| CN109434066B true CN109434066B (en) | 2020-11-27 |
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| CN201811262002.2A Expired - Fee Related CN109434066B (en) | 2018-10-27 | 2018-10-27 | Mold and mold design method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1027912C2 (en) * | 2004-12-28 | 2006-07-03 | Ecim Technologies Bv | Mold and method for product formation. |
| JP4883308B2 (en) * | 2007-07-23 | 2012-02-22 | 信越化学工業株式会社 | Method for producing silicone rubber foam |
| CN101637960B (en) * | 2009-04-17 | 2011-09-14 | 华中科技大学 | Plastic injecting and shaping sprue location determining method based on surface mesh |
| CN101885222A (en) * | 2009-05-13 | 2010-11-17 | 鸿富锦精密工业（深圳）有限公司 | Injection molding device |
| EP2656997B1 (en) * | 2012-04-23 | 2020-08-12 | ABB Schweiz AG | Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same |
| CN204276862U (en) * | 2014-11-19 | 2015-04-22 | 无锡市沐勒机械科技有限公司 | A kind of row material injecting mechanism of die casting machine |
| CN207431212U (en) * | 2017-10-09 | 2018-06-01 | 广东伊之密精密机械股份有限公司 | The semisolid injection (mo(u)lding) machine of multistation injection |
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Effective date of registration: 20201112 Address after: Room 301, unit 1, building 105, Hengshun Park, No. 399, Xiongzhou South Road, Longchi street, Liuhe District, Nanjing City, Jiangsu Province Applicant after: Nanjing liuchuang Technology Development Co.,Ltd. Address before: 102488 Beijing Fangshan District Liangxiang Triumph Street Jianshe Road 18 -D1948 Applicant before: BEIJING YIZHILIAN TECHNOLOGY Co.,Ltd. |
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