CN211135473U - Device for realizing magnesium alloy injection molding - Google Patents
Device for realizing magnesium alloy injection molding Download PDFInfo
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- CN211135473U CN211135473U CN201921797573.6U CN201921797573U CN211135473U CN 211135473 U CN211135473 U CN 211135473U CN 201921797573 U CN201921797573 U CN 201921797573U CN 211135473 U CN211135473 U CN 211135473U
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Abstract
The utility model discloses a realize magnesium alloy injection moulding's device, the device is including injection moulding machine and forming die, injection moulding machine includes that the screw rod jets out mechanism, hopper, long nozzle, movable mould fixed plate and cover half fixed plate, forming die includes movable mould frame, movable mould benevolence, cover half frame and cover half benevolence, its characterized in that: and a feed inlet is arranged at the center of the fixed die core, two opening ends of the feed inlet are respectively communicated with the cavity and the ejection end of the long nozzle, and a cooling sleeve is sleeved at the ejection end of the long nozzle. The utility model discloses a creatively makes semi-solid state magnesium alloy material directly send into the feed inlet of establishing at cover half benevolence center by long nozzle and gets into the die cavity, no longer adopts runner mode feeding, not only has advantages such as simple structure, waste material are few, the material loss is low, product quality is good, the shaping cycle is short simultaneously, produces safety ring and protects, has apparent value to promoting the wide application of magnesium alloy injection moulding technique in industrial field moreover.
Description
Technical Field
The utility model relates to a realize magnesium alloy and jet out fashioned device belongs to magnesium alloy contour machining technical field.
Background
The magnesium alloy is a low-density alloy, and compared with other pure metal materials or alloy materials, even compared with the aluminum alloy, the magnesium alloy has lighter weight, and meanwhile, the magnesium alloy also has the advantages of strong shock absorption capability, good impact resistance, good cutting performance, good wear resistance and the like, so that under the requirements of quality and environmental protection, the magnesium alloy is used for manufacturing automobile instrument panel frameworks, seats, steering column components, steering wheel cores, gearbox shells, engine suspensions and the like, and shells and internal parts of electronic products become the mainstream trend, magnesium alloy products are beginning to be applied to the fields of transportation, aerospace, military products, articles for daily use and the like, and therefore the forming processing technology of the magnesium alloy is also receiving more and more attention.
Because the traditional magnesium alloy is formed by a die-casting forming mode, the problems of low forming speed, low processing efficiency, easy generation of hole defects of products and the like exist, and the research focus in the field is the magnesium alloy injection forming technology at present. The magnesium alloy semi-solid injection molding technology is also called thixoforming, and refers to heating magnesium alloy particles or fragments to a partial molten state through an injection unit of an injection machine to form a solid-liquid two-phase coexisting state, namely a semi-solid state, shearing the magnesium alloy by using a screw (changing the original solid phase of the magnesium alloy into a spherical shape to reduce the viscosity of the semi-solid alloy and improve the fluidity of the semi-solid alloy) and pushing the semi-solid viscous slurry into a molding die for injection molding, wherein the molding technology is a molding process derived from plastic injection molding and applied to the magnesium alloy. However, the current methods for performing magnesium alloy injection molding all adopt runner feeding, namely: the nozzle of the injection molding machine is communicated with the sprue arranged on the fixed mold core, the semisolid magnesium alloy is injected to the sprue through the nozzle, and then the semisolid magnesium alloy is conveyed to a cavity formed by the die assembly of the movable mold core and the fixed mold core through the sprue and the runner.
Although the hot runner technology in the prior art, such as: the magnesium alloy semi-solid injection molding mold hot runner disclosed in CN201620215890.2 controls molten metal to be in a semi-molten state in a mold runner through a heating system on the hot runner, and can solve the problems of unfavorable product molding, excessive waste and the like due to longer main runner and larger pressure loss of the main runner in the molding process to a certain extent, but also has the problems of complex structure, high manufacturing cost, incapability of realizing injection molding of large-size products and the like; in addition, in the magnesium alloy injection molding multipoint feeding system disclosed in the prior patent CN201620416882.4, a splitter plate detachable from the fixed mold frame is provided, and a total feeding port and 4 branch runners are provided on the splitter plate to realize front multipoint feeding. That is to say, the prior art can not solve the problems of complicated structure, much waste, large raw material waste, not well guaranteed product quality, and unrealizable production of products with large projection area and large casting weight by a small-tonnage machine, and long molding cycle, etc. existing in magnesium alloy injection molding, so that the wide application of the magnesium alloy injection molding technology in the industrial field is limited.
SUMMERY OF THE UTILITY MODEL
The above-mentioned problem to prior art exists, the utility model aims at providing a can solve the structure that magnesium alloy injection moulding exists simultaneously complicated, the waste material is many, raw and other materials are extravagant big, the product quality can not fine assurance, can not realize the product and the shaping cycle length scheduling problem realization magnesium alloy injection moulding's of big projection area of small-tonnage board production and big casting weight device to promote the wide application of magnesium alloy injection moulding technique in industrial field.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
a device for realizing magnesium alloy injection molding comprises an injection molding machine and a molding die, wherein the injection molding machine comprises a screw injection mechanism, a hopper, a long nozzle, a movable die fixing plate and a fixed die fixing plate, the molding die comprises a movable die frame, a movable die core, a fixed die frame and a fixed die core, the movable die frame is detachably and fixedly connected with the movable die fixing plate, the movable die core is detachably and fixedly connected with the movable die frame, the fixed die frame is detachably and fixedly connected with the fixed die fixing plate, the fixed die core is detachably and fixedly connected with the fixed die frame, and a cavity formed by closing the movable die core and the fixed die core is matched with a product to be molded; the method is characterized in that: and a feed inlet is arranged at the center of the fixed die core, two opening ends of the feed inlet are respectively communicated with the cavity and the ejection end of the long nozzle, and a cooling sleeve is sleeved at the ejection end of the long nozzle.
In a preferred embodiment, the feed inlet is in the shape of a trumpet, wherein: the flaring end surface is positioned on the cavity surface of the positioning die core, and the necking end surface is abutted with the ejection end of the long nozzle.
Further preferred scheme, the longitudinal section of feed inlet is isosceles trapezoid, isosceles trapezoid's height is 18 ~ 25mm, isosceles trapezoid's base angle is 60 ~ 75 degrees.
According to a preferable scheme, the cooling sleeve is fixed in a nozzle mounting hole of the fixed die core through a nozzle positioning ring.
In a preferred embodiment, the cooling jacket is connected to an external cooling device via a condenser tube.
In a further preferred embodiment, the cooling device is a high-pressure point cooler.
The method for realizing the magnesium alloy injection molding by adopting the device comprises the following steps:
a) feeding the magnesium alloy material into a hopper;
b) the magnesium alloy material which is heated into a molten state is pushed to the long nozzle through the screw ejection mechanism and is directly ejected into the cavity through the long nozzle and a feed inlet arranged in the center of the fixed mold core; when the injection of the materials required by the molding of the magnesium alloy product is finished each time, the injection end of the long nozzle is cooled by the cooling sleeve immediately;
c) and opening the die after the magnesium alloy is formed, taking out the magnesium alloy rough product to cool to room temperature, and then milling and polishing a feed inlet blank formed on the outer surface of the magnesium alloy rough product to obtain a magnesium alloy finished product.
Compared with the prior art, the utility model discloses following beneficial technological effect has:
1. the utility model creatively leads the semisolid magnesium alloy material to be directly sent into the feed inlet arranged at the center of the fixed mould core by the long nozzle to enter the cavity, and the feeding is not carried out in a runner way, thus not only simplifying the structure of the mould obviously without a complex heating and heat-preserving system of a hot runner technology, but also needing no complex structure of multi-point feeding and reducing the volume of the mould obviously; through calculation, when processing magnesium alloy products with the same size, the utility model can reduce the mold locking force by 35 percent, and can realize the production of products with large projection area and large casting weight by using a small-tonnage machine;
2. because the cooling sleeve is sleeved at the ejection end of the long nozzle, the cooling sleeve can ensure that the material required by each molding can be quickly and timely separated from the nozzle after ejection is finished, thereby not only enabling the material feeding without a flow channel to be possible, but also saving the material to the maximum extent, reducing the material loss of the product by about 118 percent at least and remarkably reducing the production cost;
3. because the utility model is a no-flow channel feeding, the injection molding period can be obviously shortened, the molding production efficiency is improved, the shrinkage deformation of the product can be obviously improved, and the yield of the magnesium alloy is obviously improved;
4. tests prove that the tensile strength of the magnesium alloy product obtained by adopting the device of the utility model can be improved by at least 18 percent compared with the prior art, the product performance is good, and the appearance has no defect;
to sum up, the utility model discloses an creatively adopt no runner feeding mode to realize magnesium alloy injection moulding, not only have simple structure, the waste material is few, the material loss is low, product quality is good, advantages such as shaping cycle is short simultaneously, produces safety ring and protects, has apparent value to promoting magnesium alloy injection moulding technique in the wide application of industrial field, and is present to prior art, has produced obvious progressive nature.
Drawings
Fig. 1 is a schematic perspective view of an apparatus for implementing magnesium alloy injection molding according to an embodiment of the present invention;
fig. 2 is a schematic longitudinal sectional structure diagram of a forming mold provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of a transverse cross-sectional structure of a forming mold according to an embodiment of the present invention;
FIG. 4 is a schematic view of the connection structure between the long nozzle and the cooling jacket and between the long nozzle and the feed inlet according to the embodiment of the present invention;
fig. 5 is a schematic perspective view of the cavity insert according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a magnesium alloy rough product obtained by the embodiment of the present invention;
FIG. 7 is a schematic perspective view of an apparatus for injection molding of a magnesium alloy according to a comparative example;
FIG. 8 is a schematic perspective view of a stationary mold core provided in comparative example;
FIG. 9 is a stress-strain graph of the magnesium alloy products obtained in examples and comparative examples.
The numbers in the figures are as follows: 1. an injection molding machine; 11. a screw ejection mechanism; 12. a hopper; 13. a long nozzle; 131. the ejection end of the long nozzle; 14. a movable mold fixing plate; 15. fixing a die fixing plate; 2. forming a mold; 21. moving the mold frame; 22. a movable mould core; 23. a fixed mould frame; 24. fixing a mold core; 3. a cavity; 4. a feed inlet; 41. a flared end surface; 42. a necking end face; 5. a cooling jacket; 6. a nozzle positioning ring; 7. a condenser tube; 8. a feed inlet green body; 01. a gate; 02. a main flow channel; 03. and (4) branching the flow channel.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, specific embodiments and comparative examples.
Examples
Referring to fig. 1 to 5, an apparatus for implementing magnesium alloy injection molding according to the present embodiment includes an injection molding machine 1 and a molding die 2, the injection molding machine 1 comprises a screw injection mechanism 11, a hopper 12, a long nozzle 13, a movable mold fixing plate 14 and a fixed mold fixing plate 15, the forming die 2 comprises a movable die frame 21, a movable die core 22, a fixed die frame 23 and a fixed die core 24, the movable mold frame 21 is detachably and fixedly connected with the movable mold fixing plate 14 (for example, by screws), the movable mold core 22 is detachably and fixedly connected with the movable mold frame 21 (for example, by screws), the fixed mold frame 23 is detachably and fixedly connected with the fixed mold fixing plate 15 (for example, screw connection), the fixed mold core 24 is detachably and fixedly connected with the fixed mold frame 23 (for example, screw connection), the cavity 3 formed by the die assembly of the movable die core 22 and the fixed die core 24 is matched with a product to be molded; a feed inlet 4 is arranged at the center of the fixed mold core 24, two open ends of the feed inlet 4 are respectively communicated with the cavity 3 and an ejection end 131 of the long nozzle, and a cooling jacket 5 is sleeved at the ejection end 131 of the long nozzle.
In the embodiment, the feed port 4 is in a horn shape, wherein the flared end surface 41 is located on the cavity surface 31 of the cavity 24, and the necked end surface 42 abuts against the ejection end 131 of the long nozzle, the longitudinal section of the feed port 4 is an isosceles trapezoid, the height h of the isosceles trapezoid is 18-25 mm, and the base angle α of the isosceles trapezoid is 60-75 degrees.
The cooling jacket 5 is fixed in the nozzle mounting hole of the fixed die core 24 through a nozzle positioning ring 6, and the cooling jacket 5 is communicated with an external cooling device (not shown in the figure) through a condensation pipe 7, wherein the cooling device is preferably a high-pressure point cooling machine, for example, the high-pressure point cooling machine disclosed in the Chinese utility model patent Z L2014205679866, can realize fixed-point, timed and quantitative cooling, and has the advantage of uniform cooling.
In addition, it is to be noted herein that the injection molding machine 1 described in this patent is a commercially available known product, for example, a Japanese Steel JSW-J L M series magnesium alloy injection molding machine, and thus is not shown in its entirety in the drawings, because no related modifications are involved.
The method for realizing the magnesium alloy injection molding by adopting the device comprises the following steps:
a) feeding magnesium alloy material into hopper 12;
b) the magnesium alloy material which is heated into a molten state is pushed to the long nozzle 13 through the screw ejection mechanism 11 and is directly ejected into the cavity 3 through the long nozzle 13 and the feed inlet 4 arranged at the center of the fixed die core 24; when the injection of the materials required by the molding of the magnesium alloy product is finished each time, the injection end 131 of the long nozzle is cooled by the cooling sleeve 5 immediately;
c) and opening the die after the forming, taking out the magnesium alloy rough product (shown in figure 6) to cool to room temperature, and then milling and polishing the feed inlet blank 8 formed on the outer surface of the magnesium alloy rough product to obtain a magnesium alloy finished product.
As a preferable scheme, in the step b), the cooling jacket 5 is circulated for 16 +/-2 seconds under the pressure of 15 +/-3 MPa by adopting tap water with the temperature of room temperature every time to cool the ejection end 131 of the long nozzle, so that the feeding port 4 and the ejection end 131 of the long nozzle can be separated in time, materials are saved, shrinkage cavities and cracks on the surface of a product can be avoided, and the defect of no defect in the appearance of the product can be guaranteed.
Comparative example
Referring to fig. 7 and 8, in the conventional method for implementing magnesium alloy injection molding, a runner system is used for feeding, and the feeding system includes a gate 01, a main runner 02 and a plurality of branch runners 03, and a molten magnesium alloy material is injected into the gate 01 through a nozzle 13, then passes through the main runner 02 to the plurality of branch runners 03, and then is injected into the cavity 3 through the branch runners 03.
The test shows that: assuming that the other structures are all the same as the conditions in this embodiment, the magnesium alloy finished product with the same size (length and width dimensions 65cm x 17cm) and the same weight (490g) as the embodiment of the present invention is formed by using the existing flow channel mode, and at least the materials are needed: 1168g (including the loss of the slag ladle and the runner), and the projection area of the casting on the parting surface reaches 65cm by 30 cm; the utility model has no loss of the flow channel, therefore, only 590g of material is needed, and the projection area of the casting on the parting surface is only 65cm x 20 cm; the following calculation is carried out:
the calculation formula of the die-casting machine clamping force is as follows: f lock is more than or equal to K and F main, wherein: f lock-represents the mold locking pressure of the die casting machine; k-represents a safety factor, typically K ═ 1.1; fmain-represents the main expansion force, the projection area of the casting on a parting surface, including the areas of a gating system, an overflow system and an exhaust system, multiplied by a specific pressure (KN), namely: f is mainly equal to A and P/10, A-represents the projection area of the casting on the parting surface, and P-represents the compaction pressure; therefore, adopt the utility model discloses the size of required mode locking power does:
f lock 65, 20, 60, 1.1/10 8580KN, while the magnitude of the required clamping force for the comparative example is:
f lock 65 30 60 1.1/10 12870 KN; it can be seen that: the utility model discloses can make the mode locking power reduce, can realize producing the product of big projection area and big casting weight with the small-tonnage board.
Additionally, the utility model discloses a material loss does: (590-: (1168-; it can be seen that: compared with the prior art, the utility model, can make the material loss reduce 118%, not only obviously practice thrift the cost, also avoided the difficult problem of retrieving of a large amount of magnesium alloy waste materials moreover, have and show energy-concerving and environment-protective advantage.
Referring to fig. 9, it can be seen from fig. 9 that the tensile strength of the magnesium alloy product obtained by using the present invention is 187.1MPa, while the tensile strength of the magnesium alloy product obtained by using the comparative example is 158.4MPa, as follows: compared with the prior art, the utility model, still can make the tensile strength of the magnesium alloy product who obtains improve 18% at least, and it can be good to produce the property.
To sum up, the utility model discloses an creatively adopt no runner feeding mode to realize magnesium alloy injection moulding, not only have simple structure, the waste material is few, the material loss is low, product quality is good, advantages such as shaping cycle is short simultaneously, produces safety ring and protects, has apparent value to promoting magnesium alloy injection moulding technique in the wide application of industrial field, and is present to prior art, has produced obvious progressive nature.
It is finally necessary to point out here: the above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. A device for realizing magnesium alloy injection molding comprises an injection molding machine and a molding die, wherein the injection molding machine comprises a screw injection mechanism, a hopper, a long nozzle, a movable die fixing plate and a fixed die fixing plate, the molding die comprises a movable die frame, a movable die core, a fixed die frame and a fixed die core, the movable die frame is detachably and fixedly connected with the movable die fixing plate, the movable die core is detachably and fixedly connected with the movable die frame, the fixed die frame is detachably and fixedly connected with the fixed die fixing plate, the fixed die core is detachably and fixedly connected with the fixed die frame, and a cavity formed by closing the movable die core and the fixed die core is matched with a product to be molded; the method is characterized in that: and a feed inlet is arranged at the center of the fixed die core, two opening ends of the feed inlet are respectively communicated with the cavity and the ejection end of the long nozzle, and a cooling sleeve is sleeved at the ejection end of the long nozzle.
2. The apparatus of claim 1, wherein: the feed inlet is loudspeaker shape, wherein: the flaring end surface is positioned on the cavity surface of the positioning die core, and the necking end surface is abutted with the ejection end of the long nozzle.
3. The apparatus of claim 2, wherein: the longitudinal section of the feed inlet is an isosceles trapezoid, the height of the isosceles trapezoid is 18-25 mm, and the base angle of the isosceles trapezoid is 60-75 degrees.
4. The apparatus of claim 1, wherein: the cooling jacket is fixed in the nozzle mounting hole of the fixed die core through a nozzle positioning ring.
5. The apparatus of claim 1, wherein: the cooling jacket is communicated with external cooling equipment through a condensation pipe.
6. The apparatus of claim 5, wherein: the cooling equipment is a high-pressure point cooler.
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| CN201921797573.6U CN211135473U (en) | 2019-10-24 | 2019-10-24 | Device for realizing magnesium alloy injection molding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110695335A (en) * | 2019-10-24 | 2020-01-17 | 上海五腾金属制品有限公司 | Device and method for realizing magnesium alloy injection molding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110695335A (en) * | 2019-10-24 | 2020-01-17 | 上海五腾金属制品有限公司 | Device and method for realizing magnesium alloy injection molding |
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