CN112296309B

CN112296309B - Mold for semi-solid rheo-die-casting aluminum alloy 5G communication base station case shell part and using method thereof

Info

Publication number: CN112296309B
Application number: CN202011203641.9A
Authority: CN
Inventors: 姜巨福; 黄敏杰; 王迎; 胡连喜; 管仁国; 付莹
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2022-02-15
Anticipated expiration: 2040-11-02
Also published as: CN112296309A

Abstract

A die for semi-solid rheocasting of an aluminum alloy 5G communication base station chassis shell part and a use method thereof relate to a die for semi-solid rheocasting and a use method thereof. The invention aims to solve the technical problems of low forming precision, quality and performance of complex die castings such as the case shell of the aluminum alloy 5G communication base station produced by the traditional die casting. The pouring gate of the pouring system of the die is designed into a pouring gate side core pulling mechanism capable of pulling core. The rheoforming method comprises the following steps: preparing alloy semi-solid slurry, heating a mould, closing the mould, and sending the semi-solid slurry into a pressure chamber; injecting slurry into the cavity, rheologically filling, forming and maintaining pressure; opening the die, and leaving the die casting on the fixed die; drawing out the side core pulling and pouring gate core pulling slide blocks; the movable mold pushing mechanism pushes out a slag ladle, and the fixed mold pushing mechanism pushes out a rheologic die casting. The semi-solid rheologic die-casting forming method is used for semi-solid rheologic die-casting forming of the aluminum alloy 5G communication base station chassis shell part.

Description

Mold for semi-solid rheo-die-casting aluminum alloy 5G communication base station case shell part and using method thereof

Technical Field

The invention relates to a semi-solid rheologic die-casting forming die and a using method thereof.

Background

The die-casting molding is a precise casting method for forcibly pressing molten metal into a metal die with a complex shape by utilizing high pressure, ensures the precision of parts by die-casting molding, avoids secondary machining and has quick production takt. However, in the conventional die-casting forming, the alloy liquid fills the cavity with high-speed turbulent flow to be wrapped with gas, and in addition, the gas in the cavity and the gas generated by the coating cannot be effectively removed during forming, so that the defects of loose pores and the like are easily generated, and the formed part cannot be subjected to subsequent heat treatment strengthening, which limits the further improvement of the mechanical property of the formed part. For large die castings such as 5G communication base station chassis shells with high and thin radiating teeth and a plurality of complex cavity characteristics, the traditional die casting production has to generate more defects inside the components. The semi-solid forming blank generally has a solid fraction of 40-60%, the forming temperature is about 100 ℃ lower than that of liquid forming, and slurry fills a cavity in a laminar flow mode during semi-solid filling, so that the defects of subcutaneous air holes, shrinkage porosity and the like are greatly reduced, and the density is increased. Compared with the traditional die-casting forming, the semi-solid rheologic die-casting forming can further improve the compactness and the mechanical property of the component while ensuring the forming size precision of the complex component.

Disclosure of Invention

The invention provides a die for forming an aluminum alloy 5G communication base station chassis shell part by semi-solid rheologic die-casting and a using method thereof, aiming at solving the technical problems of low forming, precision, quality and performance of complex die castings such as the aluminum alloy 5G communication base station chassis shell part produced by the traditional die-casting.

The invention relates to a die for forming an aluminum alloy 5G communication base station case shell part by semi-solid rheologic die-casting, which consists of a fixed die base plate 1, a fixed die ejecting mechanism 2, a fixed die base plate support plate 3, a fixed die base plate 4, a fixed die sleeve 5, a hydraulic core pulling mechanism 6, a pouring channel core pulling mechanism 7, a movable die sleeve 8, a movable die base plate 9, a movable die base 10, a movable die ejecting mechanism 11, a fixed die core 12, a movable die core 13, a square guide pillar 25, a guide block 26 and a sprue bush 37;

the surface of the fixed die bottom plate 1 is provided with a sprue hole 1-1 and a plurality of first screw holes 1-2;

the fixed die ejecting mechanism 2 consists of a fixed die ejecting fixing plate 27, a fixed die ejecting plate 28, a plurality of fixed die

push rods

29, 4 fixed die

ejecting guide pillars

30 and 4 fixed die ejecting guide sleeves 31; the fixed die push-out fixing plate 27 and the fixed die push plate 28 are fixed through screws, fixed die push-out guide sleeves 31 are respectively fixed at four corners of the surface of the fixed die push-out fixing plate 27, which is far away from the fixed die push plate 28, and the fixed die push-out guide sleeves 31 are hollow cylinders and are of open structures at the upper part and the lower part; each fixed mold ejecting guide sleeve 31 is internally provided with a fixed mold ejecting guide pillar 30, and the fixed mold ejecting guide pillar 30 is in sliding connection with the fixed mold ejecting guide sleeve 31; a plurality of fixed die push rods 29 are fixed at the center of the surface of the fixed die push-out fixing plate 27 departing from the fixed die push plate 28, and the fixed die push rods 29 are vertical to the fixed die push-out fixing plate 27;

the center of the fixed die sleeve 5 is of a hollow structure, and the upper edge of the hollow structure is provided with a step groove 5-4; a plurality of first through holes 5-1 are respectively arranged on a pair of opposite side walls of the fixed mold sleeve 5, a second through hole 5-2 is arranged beside the first through holes 5-1, and a sprue sleeve hole 5-3 is arranged on the surface of the fixed mold sleeve 5;

the pouring gate core pulling mechanism 7 consists of a pouring gate core pulling block 14, a pouring gate core pulling slide block 15, a shunting cone 16, a wedge block 17, a guide slide block 18, a hydraulic cylinder fixing vertical support 19, a hydraulic cylinder fixing transverse support 20, a hydraulic cylinder 21, a coupler 22, a coupling 23 and a coupling fixing block 24; a fan-shaped pouring channel cavity 14-1 is arranged on one surface of the pouring channel core-pulling block 14, an installation groove 14-2 is arranged close to the fan-shaped pouring channel cavity 14-1, a plurality of second screw holes 14-4 are arranged at the bottom of the installation groove 14-2, a first plane 14-5 is arranged on the inner side wall of the installation groove 14-2, and the first plane 14-5 is positioned at one end far away from the fan-shaped pouring channel cavity 14-1; a plurality of third screw holes 14-3 are formed in one surface of the pouring gate core-pulling block 14, and the third screw holes 14-3 and the mounting grooves 14-2 are located on the same surface; the tail end of the pouring gate core-pulling block 14 is an inclined plane 14-6, and the included angle alpha between the inclined plane 14-6 and the surface where the sector pouring gate die cavity is located is 100 degrees; a groove 15-3 is formed in one surface of the pouring channel core pulling slide block 15, and a plurality of fourth screw holes 15-1 are formed in the surface of the groove 15-3; the pouring gate core pulling block 14 is fixed on the surface of a groove 15-3 of the pouring gate core pulling slide block 15, the third screw hole 14-3 and the fourth screw hole 15-1 are fixed through screws, and the mounting groove 14-2 is arranged on one side far away from the pouring gate core pulling slide block 15; a second plane 16-2 vertical to the base 16-3 is arranged on the base 16-3 of the diverging cone 16, a plurality of fifth screw holes 16-1 are arranged on the bottom surface of the diverging cone 16, and the structure of the base 16-3 of the diverging cone 16 is matched with the mounting groove 14-2; a base 16-3 of the shunting cone 16 is fixed in the mounting groove 14-2, a fifth screw hole 16-1 and a second screw hole 14-4 are fixed through screws, and a second plane 16-2 is tightly attached to a first plane 14-5; the center of the movable mold sleeve 8 is of a hollow structure, and a step groove is formed in the upper edge of the hollow structure; a through groove 8-1 is formed in the surface of one frame of the movable mold sleeve 8, a plurality of sixth screw holes 8-2 are formed in two sides of the bottom surface of the through groove 8-1, and the through groove 8-1 and the step groove of the movable mold sleeve 8 are located on two opposite surfaces; a lubricating oil groove 18-2 is formed in the side wall of the guide sliding block 18, and a plurality of seventh screw holes 18-1 are formed in the surface perpendicular to the lubricating oil groove 18-2; the two guide sliding blocks 18 are respectively fixed on two sides of the bottom surface of the through groove 8-1, and the seventh screw hole 18-1 and the sixth screw hole 8-2 are fixed through screws; the pouring gate core-pulling sliding block 15 is arranged on the bottom surface of the through groove 8-1, the groove 15-3 is positioned on one side away from the through groove 8-1, the two guide sliding blocks 18 are positioned on the outer walls of the two side plates 15-2 of the pouring gate core-pulling sliding block 15, the two guide sliding blocks 18 and the through groove 8-1 are in sliding connection, and the lubricating oil groove 18-2 is positioned on one side far away from the pouring gate core-pulling sliding block 15;

the movable mold push-out mechanism 11 consists of a movable mold push plate 32, a movable mold push-out fixing plate 33, a plurality of movable

mold push rods

34, 4 movable mold push-out

guide posts

35 and 4 movable mold push-out guide sleeves 36; the movable mold push plate 32 and the movable mold push-out fixing plate 33 are fixed through screws, a movable mold push-out guide sleeve 36 is fixed at each of four corners of the surface of the movable mold push-out fixing plate 33, which is far away from the movable mold push plate 32, and the movable mold push-out guide sleeves 36 are hollow cylinders and are of open structures at the upper part and the lower part; each movable mold ejecting guide sleeve 36 is internally provided with a movable mold ejecting guide pillar 35, and the movable mold ejecting guide pillar 35 is in sliding connection with the movable mold ejecting guide sleeve 36; a plurality of movable mold push rods 34 are fixed on the surface of the movable mold push-out fixing plate 33, which is far away from the movable mold push plate 32, and the movable mold push rods 34 are vertical to the movable mold push-out fixing plate 33;

a first shoulder structure 12-1 is arranged on the outer edge of the fixed die core 12, and a plurality of third through holes 12-2 are respectively arranged on a pair of opposite side walls of the fixed die core 12;

a second shoulder structure 13-1 is arranged on the outer edge of the movable mold core 13;

the fixed die base plate 1 is fixed with a fixed die base plate 4 through two fixed die base plate support plates 3, the fixed die base plate 1 is parallel to the fixed die base plate 4 and is perpendicular to the two fixed die base plate support plates 3, the two fixed die base plate support plates 3 are positioned between the fixed die base plate 1 and the fixed die base plate 4, and the two fixed die base plate support plates 3 are positioned on two sides of the same surface of the fixed die base plate 1; the fixed die core 12 is arranged in the hollow part of the fixed die sleeve 5, and the first shoulder structure 12-1 is matched with the step groove 5-4; the third through hole 12-2 is communicated with the first through hole 5-1; the fixed die base plate 4 and the fixed die sleeve 5 are fixed through screws, and the fixed die sleeve 5 is positioned on one side far away from the fixed die base plate support plate 3; the fixed die push-out mechanism 2 is positioned between the fixed die bottom plate 1 and the fixed die base plate 4, and the fixed die push rod 29 and the fixed die push-out guide pillar 30 both penetrate through the fixed die base plate 4 and the fixed die core 12; the fixed die push rod 29 is in sliding relation with the fixed die core 12 and the fixed die base plate 4; the fixed die push-out guide pillar 30 is relatively fixed with the fixed die core 12 and the fixed die base plate 4;

the wedge-caulking block 17 is fixed below the side of a sprue sleeve hole 5-3 of the fixed die sleeve 5 through a screw, one inner wall of the wedge-caulking block 17 is closely attached and matched with an inclined surface 14-6 of the sprue core-pulling block 14, and two surfaces are in sliding connection; the hydraulic cylinder 21 is fixed on a coupler 22 through a hydraulic cylinder fixing vertical support 19 and a hydraulic cylinder fixing transverse support 20, and then is connected with a coupling 23 through the coupler 22, the coupling 23 is connected to a coupling fixing block 24 through a clamping groove, and the coupling fixing block 24 is connected to the side wall of the pouring gate core-pulling slide block 15 through a screw; the sprue bush 37 penetrates through the sprue bush holes 5-3 of the fixed die base plate 4 and the fixed die bush 5, and the sprue bush 37, the fixed die base plate 4 and the fixed die bush 5 are in fixed relation; the middle upper part of the spreader cone 16 is arranged inside the sprue bush 37, and the spreader cone 16 and the sprue bush 37 are in sliding connection;

the movable mould base plate 9 is fixedly connected with the movable mould base 10; the movable mold core 13 is arranged in the hollow part of the movable mold sleeve 8, and the second shoulder structure 13-1 is matched with the step groove of the movable mold sleeve 8; the movable die sleeve 8 and the movable die base plate 9 are fixed through screws, and the movable die sleeve 8 is tightly attached to the second shoulder structure 13-1; the movable mold push-out mechanism 11 is positioned in a groove below the movable mold base 10 and is positioned on one side of the movable mold base 10 far away from the movable mold base plate 9, and the movable mold push rod 34 and the movable mold push-out guide pillar 35 both penetrate through the movable mold base plate 9 and the movable mold core 13; the movable mold push rod 34, the movable mold backing plate 9 and the movable mold core 13 are in sliding relation; the movable mold push-out guide pillar 35, the movable mold backing plate 9 and the movable mold core 13 are in relatively fixed relation;

the movable mold core 13 is tightly attached to the fixed mold core 12, and the fixed mold sleeve 5 is tightly attached to the movable mold sleeve 8; the pouring channel core-pulling slide block 15 is tightly attached to the movable mold core 13, and the pouring channel core-pulling block 14 is tightly attached to the movable mold core 13;

four edges of the outer walls of the fixed die sleeve 5, the movable die sleeve 8 and the movable die base plate 9 are respectively provided with 1

square guide post

25 and 4 guide blocks 26 for guiding in a matching way;

on four outer walls of the die, one outer wall is provided with a pouring gate core-pulling mechanism 7, the other three outer walls are provided with hydraulic core-pulling mechanisms 6, and the hydraulic core-pulling mechanisms 6 are arranged on the outer walls of the die fixing sleeve 5.

The hydraulic core-pulling mechanism 6 of the present invention is conventional.

The die for forming the aluminum alloy 5G communication base station case shell part by semi-solid rheologic die-casting has the working principle and beneficial effects that: the fixed die base plate 3, the fixed die sleeve 5, the movable die sleeve 8 and the movable die base plate 9 are main carriers of die bearing force, the die strength is guaranteed, the integrated movable die base 10 plays a role in connection with a bottom plate of a die casting machine, one role of the fixed die bottom plate 1 is to connect the fixed die part of the die with the bottom plate of the die casting machine through the fixed die cushion block 3, and the other role is to install and fix a hydraulic cylinder for applying pushing force to the fixed die pushing-out mechanism 2; the movable mold core 13 and the fixed mold core 12 are used as mold cavities of the forming component; the hydraulic side core-pulling mechanism 6 realizes the forming of the side characteristics of the component; the pouring gate core-pulling mechanism 7 is used for arranging a pouring gate cavity on the pouring gate core-pulling block 14, so that firstly, the pouring gate cavity of a pouring gate system arranged on a parting surface is conveniently processed, and on the other hand, the demoulding of the pouring gate part of a die casting is realized through core pulling after rheological die-casting forming.

A pouring cavity is processed on the pouring core-pulling block 14, the sprue spreader 16 is fastened on the pouring core-pulling block 14 through screws to form a part of a mould pouring system, the pouring core-pulling block 14 and the pouring core-pulling sliding block 15 are fixedly connected through screws, the pouring core-pulling sliding block 15 is matched with the two guide sliding blocks 18 to realize sliding core pulling, and a 100-degree inclined plane is processed at the tail end of the pouring core-pulling block 14 and matched with an inclined plane of the wedge block 17 to balance lateral bulging force during mould closing so as to realize wedge locking. The hydraulic cylinder 21 is connected with a coupling 23 through a coupler 22, the coupling 23 is connected onto a coupling fixing block 24 through a clamping groove, the coupling fixing block 24 is connected to the tail end of the pouring gate core pulling slider 15 through a screw, and in the design, a part of the pouring gate is designed into a core pulling form, so that on one hand, the height position of the pouring gate is higher than a parting surface, the position of the pouring gate is positioned in the middle of the side surface of a component, and the pouring filling forming is facilitated; on the other hand, the runner cavity on the independent runner core-pulling block 14 is convenient to be processed independently, and meanwhile, after the runner core-pulling sliding block 15 is pulled out under the action of the hydraulic cylinder 21 after the rheologic die-casting forming, smooth demoulding of a die casting pouring system part can be ensured.

The sprue spreader 16 in the die runner system has the function of blocking cold materials, a second plane 16-2 perpendicular to the base 16-3 is arranged on the base 16-3 of the sprue spreader 16, and the rotation stopping and positioning of the sprue spreader 16 are realized by matching with the first plane 14-5 of the mounting groove 14-2 on the sprue core-pulling block 14.

The mold is heated by processing a row of third through holes 12-2 parallel to a parting surface on the molded surface part of the forming radiating teeth of the fixed mold core 12, and processing the same first through holes 5-1 at the same position where the fixed mold sleeve 5 is matched with the fixed mold core 12 for mounting a heating oil pipe, wherein the oil pipe is heated by a mold temperature controller, so that the cavity part of the forming core radiating teeth is ensured to have a temperature field, and the smooth flowing and filling of slurry are ensured. The design solves the problem that the high and thin-walled heat dissipation teeth cannot be completely filled and formed due to insufficient temperature during forming, the heating oil pipe is heated by the mold temperature controller, the oil pipe transmits heat to the mold, the temperature field of the cavity part of the heat dissipation tooth-shaped cavity is improved, the flowability of semi-solid slurry is ensured, and complete filling is facilitated.

The cooling measure of the die is to process a second through hole 5-2 above the moulding surface of a pouring channel of the fixed die sleeve 5, wherein the second through hole is used for installing a cooling water pipe and cooling the position near the pouring channel. The design effectively reduces the temperature around the pouring gate with a higher temperature field, and ensures partial solidification and molding of the pouring system.

The die guide mechanism of the invention adopts the square guide post 25 and the guide block 26 which are arranged outside the die to cooperate for guiding. The design ensures the die-opening and die-closing guiding precision of the rheologic die-casting forming die, and because the length and width of the rheologic die-casting die exceed 1500mm, the square guide pillar 25 and the guide block 26 are adopted for guiding, so that the influence of different thermal expansion on the die-guiding precision can be avoided, the guiding precision is ensured, and the external structural design is more compact.

The fixed die push rod 29 acts on the top part of the reinforcing rib on the die casting heat dissipation tooth, a die-cast component is ejected through the integral action of the fixed die ejecting mechanism 2, and accurate guiding of ejection is realized through the matching of the square guide pillar 25 and the guide block 26.

And a die-casting slag ladle is ejected out of every two movable mould push rods 34, so that the ejection of the overflow slag ladle remained on the movable mould part is ensured, and the accurate guiding of the ejection is realized by matching the square guide columns 25 with the guide blocks 26.

The use method of the die for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell part comprises the following steps:

step one, preparing alloy semi-solid slurry formed by rheologic die-casting, wherein the solid phase fraction of the semi-solid slurry is controlled to be 12-22%; the semi-solid slurry is an aluminum alloy A356 semi-solid slurry, an A357 semi-solid slurry, an A380 semi-solid slurry or an Al-8Si-0.6Mg-0.15Cu-0.5Fe aluminum alloy semi-solid slurry;

step two, heating the semi-solid rheological die-casting die to 275-305 ℃ by using a die temperature machine;

step three, closing the semi-solid rheological die casting mold;

step four, sending the semi-solid slurry into a pressure chamber on a die casting machine to prepare for rheologic die casting forming;

step five, the injection piston pushes the semi-solid slurry to be injected into a die cavity, and rheological filling forming is carried out; the speed of the injection piston for pushing the semi-solid slurry to pass through the gate is controlled to be 1.55-2.15 m/s, and the injection specific pressure is controlled to be 70-90 Mpa;

sixthly, opening the die, and reserving the die casting in the fixed die core 12;

step seven, hydraulic cylinders of the hydraulic core pulling mechanism 6 and the pouring gate core pulling mechanism 7 are retracted, and the hydraulic core pulling and pouring gate core pulling sliding blocks 15 are pulled out;

eighthly, ejecting the slag ladle out of the movable mold ejection mechanism 11, and ejecting the rheologic die casting out of the fixed mold ejection mechanism 2;

and step nine, cooling the semi-solid rheologic die-casting piece to room temperature in air.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention is provided with a loose core pouring system, and realizes pouring from the middle part of the side surface of the shell piece of the aluminum alloy 5G communication base station case by utilizing the sector pouring gate cavity 14-1, so that the filling is stable and complete, and the pouring gate core-pulling block 14 is favorable for demoulding of the pouring system;

(2) the invention adopts semi-solid rheologic die-casting forming, compared with the traditional die-casting forming, the invention reduces the defect of internal air holes and improves the density and the comprehensive performance of the component;

(3) the invention heats the heat dissipation tooth part formed by the die cavity, so that the high and thin heat dissipation tooth is completely filled, and the quality of the product is ensured.

Drawings

Fig. 1 is a schematic perspective view of a mold for semi-solid rheo-die-casting an aluminum alloy 5G communication base station chassis housing part according to a first embodiment;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic view of the stationary mold core 12 according to the first embodiment;

fig. 5 is a schematic view of the movable mold core 13 according to the first embodiment;

FIG. 6 is a schematic view of a sprue core-pulling mechanism 7 according to a first embodiment;

FIG. 7 is a schematic view of the sprue core block 14 of the first embodiment;

FIG. 8 is a schematic view in the direction C of FIG. 7;

fig. 9 is a schematic view of a skimmer cone 16 according to the first embodiment;

FIG. 10 is a bottom view of FIG. 9;

FIG. 11 is a schematic view of a square guide post 25 and a guide block 26 according to the first embodiment;

fig. 12 is a first schematic view of the fixed die push-out mechanism 2 according to the first embodiment;

fig. 13 is a second schematic view of the fixed mold push-out mechanism 2 according to the first embodiment;

FIG. 14 is a schematic view of the stationary mold sleeve 5 according to the first embodiment;

fig. 15 is a schematic view of the movable mold ejector mechanism 11 according to the first embodiment;

FIG. 16 is a schematic cross-sectional view taken along line B-B of FIG. 3;

fig. 17 is a schematic view of a movable die sleeve 8 according to a first embodiment;

FIG. 18 is a schematic view of a guide shoe 18 according to a first embodiment;

fig. 19 is a schematic view of the sprue puller slide 15 according to the first embodiment.

Detailed Description

The first embodiment is as follows: the embodiment is a die for forming an aluminum alloy 5G communication base station case shell part by semi-solid rheo-die casting, and as shown in fig. 1-19, the die specifically comprises a fixed die base plate 1, a fixed die ejecting mechanism 2, a fixed die base plate support plate 3, a fixed die base plate 4, a fixed die sleeve 5, a hydraulic core pulling mechanism 6, a pouring channel core pulling mechanism 7, a movable die sleeve 8, a movable die base plate 9, a movable die base 10, a movable die ejecting mechanism 11, a fixed die core 12, a movable die core 13, a square guide pillar 25, a guide block 26 and a pouring gate sleeve 37;

the fixed die ejecting mechanism 2 consists of a fixed die ejecting fixing plate 27, a fixed die ejecting plate 28, a plurality of fixed

die push rods

29, 4 fixed die ejecting

guide pillars

mold push rods

34, 4 movable mold push-out guide posts 35 and 4 movable mold push-out guide sleeves 36; the movable mold push plate 32 and the movable mold push-out fixing plate 33 are fixed through screws, a movable mold push-out guide sleeve 36 is fixed at each of four corners of the surface of the movable mold push-out fixing plate 33, which is far away from the movable mold push plate 32, and the movable mold push-out guide sleeves 36 are hollow cylinders and are of open structures at the upper part and the lower part; each movable mold ejecting guide sleeve 36 is internally provided with a movable mold ejecting guide pillar 35, and the movable mold ejecting guide pillar 35 is in sliding connection with the movable mold ejecting guide sleeve 36; a plurality of movable mold push rods 34 are fixed on the surface of the movable mold push-out fixing plate 33, which is far away from the movable mold push plate 32, and the movable mold push rods 34 are vertical to the movable mold push-out fixing plate 33;

square guide post

25 and 4 guide blocks 26 for guiding in a matching way;

The hydraulic core-pulling mechanism 6 of the present embodiment is a conventional technique.

The semi-solid rheo-die-casting die for the aluminum alloy 5G communication base station case shell part has the following working principle and beneficial effects: the fixed die base plate 3, the fixed die sleeve 5, the movable die sleeve 8 and the movable die base plate 9 are main carriers of die bearing force, the die strength is guaranteed, the integrated movable die base 10 plays a role in connection with a bottom plate of a die casting machine, one role of the fixed die bottom plate 1 is to connect the fixed die part of the die with the bottom plate of the die casting machine through the fixed die cushion block 3, and the other role is to install and fix a hydraulic cylinder for applying pushing force to the fixed die pushing-out mechanism 2; the movable mold core 13 and the fixed mold core 12 are used as mold cavities of the forming component; the hydraulic side core-pulling mechanism 6 realizes the forming of the side characteristics of the component; the pouring gate core-pulling mechanism 7 is used for arranging a pouring gate cavity on the pouring gate core-pulling block 14, so that firstly, the pouring gate cavity of a pouring gate system arranged on a parting surface is conveniently processed, and on the other hand, the demoulding of the pouring gate part of a die casting is realized through core pulling after rheological die-casting forming.

In the heating of the mold of the embodiment, a row of third through holes 12-2 parallel to a parting surface are processed on the molded surface part of the forming heat dissipation teeth of the fixed mold core 12, and the same first through holes 5-1 are processed at the same position where the fixed mold sleeve 5 is matched with the fixed mold core 12 and are used for installing a heating oil pipe, and the oil pipe is heated by a mold temperature controller, so that the cavity part of the forming core heat dissipation teeth is ensured to have a temperature field, and smooth flowing and filling of slurry are ensured. The design solves the problem that the high and thin-walled heat dissipation teeth cannot be completely filled and formed due to insufficient temperature during forming, the heating oil pipe is heated by the mold temperature controller, the oil pipe transmits heat to the mold, the temperature field of the cavity part of the heat dissipation tooth-shaped cavity is improved, the flowability of semi-solid slurry is ensured, and complete filling is facilitated.

The cooling measure of the mould of the embodiment is to process a second through hole 5-2 above the moulding surface of the pouring channel of the fixed mould sleeve 5, and the second through hole is used for installing a cooling water pipe and cooling the position near the pouring channel. The design effectively reduces the temperature around the pouring gate with a higher temperature field, and ensures partial solidification and molding of the pouring system.

The die guide mechanism of the present embodiment is guided by fitting a square guide post 25 and a guide block 26 provided outside the die. The design ensures the die-opening and die-closing guiding precision of the rheologic die-casting forming die, and because the length and width of the rheologic die-casting die exceed 1500mm, the square guide pillar 25 and the guide block 26 are adopted for guiding, so that the influence of different thermal expansion on the die-guiding precision can be avoided, the guiding precision is ensured, and the external structural design is more compact.

The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the height of the pouring channel core-pulling block 14 is 90 mm; the height of the shunting cone 16 is 88mm, and the inclination of the cone surface is 15 degrees; the cross section of an inner pouring channel on the fixed mold core 12 is 650mm in width and 2.5mm in thickness; the width L of the sector-shaped runner cavity 14-1 on the runner core-pulling block 14 is 650mm, and the thickness of the sector-shaped runner cavity 14-1 is 17 mm. The rest is the same as the first embodiment.

The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the height of the hydraulic cylinder fixing vertical support 19 is 310 mm. The others are the same as in the first or second embodiment.

The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the cylinder diameter of the hydraulic cylinder 21 is 260mm, and the stroke is 50 mm. The rest is the same as one of the first to third embodiments.

The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the cross section of the head of the fixed die push rod 29 is rectangular, the size of the rectangular cross section is 6mm multiplied by 14mm, and the height of the fixed die push rod 29 is 596 mm. The rest is the same as the fourth embodiment.

The sixth specific implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the head section of the movable mold push rod 34 is circular, the diameter of the circular section is 20mm, and the height of the movable mold push rod 34 is 609 mm. The rest is the same as the fifth embodiment.

The seventh embodiment: the fourth difference between this embodiment and the specific embodiment is that: the aperture of the third through hole 12-2 is 18 mm. The rest is the same as the sixth embodiment.

The specific implementation mode is eight: the fourth difference between this embodiment and the specific embodiment is that: the fixed die push plate 28 and the fixed die push-out fixing plate 27 are provided with arc notches 39 in the direction of the sprue bush 37, and a placing space of a pressure chamber of the die-casting machine is reserved. The rest is the same as the seventh embodiment.

The specific implementation method nine: the embodiment is a method for using a die for semi-solid rheo-die-casting an aluminum alloy 5G communication base station chassis shell part, which comprises the following steps:

step one, preparing alloy semi-solid slurry formed by rheologic die-casting, wherein the solid phase fraction of the semi-solid slurry is controlled to be 12-22%;

step three, closing the semi-solid rheological die casting mold;

The detailed implementation mode is ten: the present embodiment is different from the specific embodiment in that: the semi-solid slurry in the step one is an aluminum alloy A356 semi-solid slurry, an A357 semi-solid slurry, an A380 semi-solid slurry or an Al-8Si-0.6Mg-0.15Cu-0.5Fe aluminum alloy semi-solid slurry. The rest is the same as in the ninth embodiment.

The invention was verified with the following tests:

test one: the test is a die for forming the aluminum alloy 5G communication base station case shell part by semi-solid rheo-die casting, and as shown in figures 1-19, the test specifically comprises a fixed die base plate 1, a fixed die ejecting mechanism 2, a fixed die base plate support plate 3, a fixed die base plate 4, a fixed die sleeve 5, a hydraulic core pulling mechanism 6, a pouring gate core pulling mechanism 7, a movable die sleeve 8, a movable die base plate 9, a movable die base 10, a movable die ejecting mechanism 11, a fixed die core 12, a movable die core 13, a square guide pillar 25, a guide block 26 and a pouring gate sleeve 37;

die push rods

29, 4 fixed die ejecting

guide pillars

mold push rods

square guide post

25 and 4 guide blocks 26 for guiding in a matching way;

The hydraulic core-pulling mechanism 6 of the present experiment is conventional.

The height of the pouring channel core-pulling block 14 is 90 mm; the height of the shunting cone 16 is 88mm, and the inclination of the cone surface is 15 degrees; the cross section of an inner pouring channel on the fixed mold core 12 is 650mm in width and 2.5mm in thickness; the width L of the sector-shaped pouring channel cavity 14-1 on the pouring channel core-pulling block 14 is 650mm, and the thickness of the sector-shaped pouring channel cavity 14-1 is 17 mm;

the height of the hydraulic cylinder fixing vertical support 19 is 310 mm;

the cylinder diameter of the hydraulic cylinder 21 is 260mm, and the stroke is 50 mm;

the cross section of the head of the fixed die push rod 29 is rectangular, the size of the rectangular cross section is 6mm multiplied by 14mm, and the height of the fixed die push rod 29 is 596 mm;

the head section of the movable mold push rod 34 is circular, the diameter of the circular section is 20mm, and the height of the movable mold push rod 34 is 609 mm;

the aperture of the third through hole 12-2 is 18 mm;

the aperture of the second through hole 5-2 is 18 mm;

the using method of the mold for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell part in the test comprises the following specific steps:

step three, closing the semi-solid rheological die casting mold;

step nine, air-cooling the semi-solid rheologic die-casting piece to room temperature;

the semi-solid slurry in the step one is an aluminum alloy A356 semi-solid slurry, an A357 semi-solid slurry, an A380 semi-solid slurry or an Al-8Si-0.6Mg-0.15Cu-0.5Fe aluminum alloy semi-solid slurry.

The working principle and the beneficial effects of the semi-solid rheo-die-casting die for the aluminum alloy 5G communication base station case shell part are as follows: the fixed die base plate 3, the fixed die sleeve 5, the movable die sleeve 8 and the movable die base plate 9 are main carriers of die bearing force, the die strength is guaranteed, the integrated movable die base 10 plays a role in connection with a bottom plate of a die casting machine, one role of the fixed die bottom plate 1 is to connect the fixed die part of the die with the bottom plate of the die casting machine through the fixed die cushion block 3, and the other role is to install and fix a hydraulic cylinder for applying pushing force to the fixed die pushing-out mechanism 2; the movable mold core 13 and the fixed mold core 12 are used as mold cavities of the forming component; the hydraulic side core-pulling mechanism 6 realizes the forming of the side characteristics of the component; the pouring gate core-pulling mechanism 7 is used for arranging a pouring gate cavity on the pouring gate core-pulling block 14, so that firstly, the pouring gate cavity of a pouring gate system arranged on a parting surface is conveniently processed, and on the other hand, the demoulding of the pouring gate part of a die casting is realized through core pulling after rheological die-casting forming.

The heating of the die for the test is realized by processing a row of third through holes 12-2 parallel to a parting surface on the molded surface part of the forming heat dissipation teeth of the fixed die core 12, and processing the same first through holes 5-1 at the same position where the fixed die sleeve 5 is matched with the fixed die core 12 for mounting a heating oil pipe, wherein the oil pipe is heated by a die temperature machine, so that the cavity part of the forming core heat dissipation teeth is ensured to have a temperature field, and the smooth flowing and filling of slurry are ensured. The design solves the problem that the high and thin-walled heat dissipation teeth cannot be completely filled and formed due to insufficient temperature during forming, the heating oil pipe is heated by the mold temperature controller, the oil pipe transmits heat to the mold, the temperature field of the cavity part of the heat dissipation tooth-shaped cavity is improved, the flowability of semi-solid slurry is ensured, and complete filling is facilitated.

The cooling measure of the mold in the test is that a second through hole 5-2 is processed above the molded surface of a pouring channel of the fixed mold sleeve 5 and is used for installing a cooling water pipe and cooling the position near the pouring channel. The design effectively reduces the temperature around the pouring gate with a higher temperature field, and ensures partial solidification and molding of the pouring system.

The mold guide mechanism of this test uses a square guide post 25 and a guide block 26 provided outside the mold to guide in cooperation. The design ensures the die-opening and die-closing guiding precision of the rheologic die-casting forming die, and because the length and width of the rheologic die-casting die exceed 1500mm, the square guide pillar 25 and the guide block 26 are adopted for guiding, so that the influence of different thermal expansion on the die-guiding precision can be avoided, the guiding precision is ensured, and the external structural design is more compact.

Claims

1. A mold for semi-solid rheo-die-casting an aluminum alloy 5G communication base station case shell part is characterized in that the mold for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell part consists of a fixed mold base plate (1), a fixed mold ejecting mechanism (2), a fixed mold base plate support plate (3), a fixed mold base plate (4), a fixed mold sleeve (5), a hydraulic core-pulling mechanism (6), a pouring gate core-pulling mechanism (7), a movable mold sleeve (8), a movable mold base plate (9), a movable mold base (10), a movable mold ejecting mechanism (11), a fixed mold core (12), a movable mold core (13), a square guide pillar (25), a guide block (26) and a sprue bush (37);

a sprue hole (1-1) and a plurality of first screw holes (1-2) are formed in the surface of the fixed die bottom plate (1);

the fixed die push-out mechanism (2) consists of a fixed die push-out fixing plate (27), a fixed die push plate (28), a plurality of fixed die push rods (29), 4 fixed die push-out guide pillars (30) and 4 fixed die push-out guide sleeves (31); the fixed die push-out fixing plate (27) and the fixed die push plate (28) are fixed through screws, fixed die push-out guide sleeves (31) are respectively fixed at four corners of the surface of the fixed die push-out fixing plate (27) departing from the fixed die push plate (28), and the fixed die push-out guide sleeves (31) are hollow cylinders and are of open structures at the upper part and the lower part; each fixed die ejecting guide sleeve (31) is internally provided with a fixed die ejecting guide pillar (30), and the fixed die ejecting guide pillar (30) is in sliding connection with the fixed die ejecting guide sleeve (31); a plurality of fixed die push rods (29) are fixed at the center of the surface of the fixed die push-out fixing plate (27) departing from the fixed die push plate (28), and the fixed die push rods (29) are vertical to the fixed die push-out fixing plate (27);

the center of the fixed die sleeve (5) is of a hollow structure, and a step groove (5-4) is formed in the upper edge of the hollow structure; a plurality of first through holes (5-1) are respectively formed in a pair of opposite side walls of the fixed mold sleeve (5), second through holes (5-2) are formed beside the first through holes (5-1), and a sprue sleeve hole (5-3) is formed in the surface of the fixed mold sleeve (5);

the pouring gate core pulling mechanism (7) consists of a pouring gate core pulling block (14), a pouring gate core pulling slide block (15), a shunt cone (16), a wedging block (17), a guide slide block (18), a hydraulic cylinder fixing vertical support (19), a hydraulic cylinder fixing transverse support (20), a hydraulic cylinder (21), a coupling (22), a coupling (23) and a coupling fixing block (24); one surface of the pouring channel core-pulling block (14) is provided with a sector pouring channel cavity (14-1), an installation groove (14-2) is arranged close to the sector pouring channel cavity (14-1), the bottom of the installation groove (14-2) is provided with a plurality of second screw holes (14-4), the inner side wall of the installation groove (14-2) is provided with a first plane (14-5), and the first plane (14-5) is positioned at one end far away from the sector pouring channel cavity (14-1); a plurality of third screw holes (14-3) are formed in one surface of the pouring gate core-pulling block (14), and the third screw holes (14-3) and the mounting grooves (14-2) are located on the same surface; the tail end of the pouring gate core-pulling block (14) is an inclined plane (14-6), and an included angle alpha between the inclined plane (14-6) and the surface where the fan-shaped pouring gate die cavity is located is 100 degrees; a groove (15-3) is formed in one surface of the pouring channel core pulling sliding block (15), and a plurality of fourth screw holes (15-1) are formed in the surface of the groove (15-3); the pouring gate core pulling block (14) is fixed on the surface of a groove (15-3) of the pouring gate core pulling slide block (15), the third screw hole (14-3) and the fourth screw hole (15-1) are fixed through screws, and the mounting groove (14-2) is arranged on one side far away from the pouring gate core pulling slide block (15); a second plane (16-2) vertical to the base (16-3) is arranged on the base (16-3) of the shunting cone (16), a plurality of fifth screw holes (16-1) are arranged on the bottom surface of the shunting cone (16), and the structure of the base (16-3) of the shunting cone (16) is matched with the mounting groove (14-2); a base (16-3) of the shunting cone (16) is fixed in the mounting groove (14-2), a fifth screw hole (16-1) and a second screw hole (14-4) are fixed through screws, and a second plane (16-2) is tightly attached to a first plane (14-5); the center of the movable die sleeve (8) is of a hollow structure, and a step groove is formed in the upper edge of the hollow structure; a through groove (8-1) is formed in the surface of one frame of the movable die sleeve (8), a plurality of sixth screw holes (8-2) are formed in two sides of the bottom surface of the through groove (8-1), and the through groove (8-1) and a step groove of the movable die sleeve (8) are located on two opposite surfaces; a lubricating oil groove (18-2) is formed in the side wall of the guide sliding block (18), and a plurality of seventh screw holes (18-1) are formed in the surface perpendicular to the lubricating oil groove (18-2); the two guide sliding blocks (18) are respectively fixed on two sides of the bottom surface of the through groove (8-1), and the seventh screw hole (18-1) and the sixth screw hole (8-2) are fixed through screws; the pouring gate core-pulling sliding block (15) is arranged on the bottom surface of the through groove (8-1), the groove (15-3) is positioned on one side departing from the through groove (8-1), the two guide sliding blocks (18) are positioned on the outer walls of the two side plates (15-2) of the pouring gate core-pulling sliding block (15), the two guide sliding blocks (18) and the through groove (8-1) are in sliding connection, and the lubricating oil groove (18-2) is positioned on one side far away from the pouring gate core-pulling sliding block (15);

the movable die push-out mechanism (11) consists of a movable die push plate (32), a movable die push-out fixing plate (33), a plurality of movable die push rods (34), 4 movable die push-out guide columns (35) and 4 movable die push-out guide sleeves (36); the movable mold push plate (32) and the movable mold push-out fixing plate (33) are fixed through screws, movable mold push-out guide sleeves (36) are respectively fixed at four corners of the surface of the movable mold push-out fixing plate (33) departing from the movable mold push plate (32), and the movable mold push-out guide sleeves (36) are hollow cylinders and are of open structures at the upper part and the lower part; each movable mold ejecting guide sleeve (36) is internally provided with a movable mold ejecting guide pillar (35), and the movable mold ejecting guide pillar (35) is in sliding connection with the movable mold ejecting guide sleeve (36); a plurality of movable mold push rods (34) are fixed on the surface of the movable mold push-out fixing plate (33) departing from the movable mold push plate (32), and the movable mold push rods (34) are vertical to the movable mold push-out fixing plate (33);

a first shoulder structure (12-1) is arranged on the outer edge of the fixed die core (12), and a plurality of third through holes (12-2) are respectively arranged on a pair of opposite side walls of the fixed die core (12);

a second shoulder structure (13-1) is arranged on the outer edge of the movable mold core (13);

the fixed die base plate (1) is fixed with the fixed die base plate (4) through two fixed die base plate support plates (3), the fixed die base plate (1) is parallel to the fixed die base plate (4) and is perpendicular to the two fixed die base plate support plates (3), the two fixed die base plate support plates (3) are positioned between the fixed die base plate (1) and the fixed die base plate (4), and the two fixed die base plate support plates (3) are positioned on two sides of the same surface of the fixed die base plate (1); the fixed die core (12) is arranged in the hollow part of the fixed die sleeve (5), and the first shoulder structure (12-1) is matched with the step groove (5-4); the third through hole (12-2) is communicated with the first through hole (5-1); the fixed die base plate (4) is fixed with the fixed die sleeve (5) through a screw, and the fixed die sleeve (5) is positioned on one side far away from the fixed die base plate support plate (3); the fixed die push-out mechanism (2) is positioned between the fixed die base plate (1) and the fixed die base plate (4), and the fixed die push rod (29) and the fixed die push-out guide pillar (30) both penetrate through the fixed die base plate (4) and the fixed die core (12); the fixed die push rod (29) is in sliding relation with the fixed die core (12) and the fixed die base plate (4); the fixed die push-out guide column (30) is relatively fixed with the fixed die core (12) and the fixed die base plate (4);

the wedge-caulking block (17) is fixed below the side of a sprue sleeve hole (5-3) of the fixed die sleeve (5) through a screw, one inner wall of the wedge-caulking block (17) is tightly attached and matched with an inclined plane (14-6) of the sprue core-pulling block (14), and the two surfaces are in sliding connection; the hydraulic cylinder (21) is fixed on a coupler (22) through a hydraulic cylinder fixing vertical support (19) and a hydraulic cylinder fixing transverse support (20), and then is connected with a coupling (23) through the coupler (22), the coupling (23) is connected onto a coupling fixing block (24) through a clamping groove, and the coupling fixing block (24) is connected to the side wall of the pouring channel core pulling slide block (15) through a screw; the sprue bush (37) penetrates through the fixed die base plate (4) and a sprue bush hole (5-3) of the fixed die bush (5), and the sprue bush (37), the fixed die base plate (4) and the fixed die bush (5) are in fixed relation; the middle upper part of the shunting cone (16) is arranged in the sprue bush (37), and the shunting cone (16) and the sprue bush (37) are in sliding connection;

the movable mould base plate (9) is fixedly connected with the movable mould base (10); the movable mold core (13) is arranged in the hollow part of the movable mold sleeve (8), and the second shoulder structure (13-1) is matched with the step groove of the movable mold sleeve (8); the movable die sleeve (8) and the movable die base plate (9) are fixed through screws, and the movable die sleeve (8) is tightly attached to the second shoulder structure (13-1); the movable mold push-out mechanism (11) is positioned in a groove below the movable mold base (10) and is positioned on one side of the movable mold base (10) far away from the movable mold base plate (9), and the movable mold push rod (34) and the movable mold push-out guide pillar (35) both penetrate through the movable mold base plate (9) and the movable mold core (13); the movable mold push rod (34), the movable mold backing plate (9) and the movable mold core (13) are in sliding relation; the movable mold push-out guide post (35), the movable mold backing plate (9) and the movable mold core (13) are in relatively fixed relation;

the movable mold core (13) is tightly attached to the fixed mold core (12), and the fixed mold sleeve (5) is tightly attached to the movable mold sleeve (8); the pouring channel core-pulling slide block (15) is tightly attached to the movable mold core (13), and the pouring channel core-pulling block (14) is tightly attached to the movable mold core (13);

four edges of the outer walls of the fixed die sleeve (5), the movable die sleeve (8) and the movable die base plate (9) are respectively provided with 1 square guide pillar (25) and 4 guide blocks (26) for guiding in a matching way;

on four outer walls of the die, one outer wall is provided with a pouring channel core-pulling mechanism (7), the other three outer walls are provided with hydraulic core-pulling mechanisms (6), and the hydraulic core-pulling mechanisms (6) are arranged on the outer walls of the die fixing sleeves (5).

2. The die for semi-solid rheo-die-casting aluminum alloy 5G communication base station case shell member according to claim 1, wherein the height of the runner core block (14) is 90 mm; the height of the shunting cone (16) is 88mm, and the inclination of the cone surface is 15 degrees; the cross section of an inner pouring channel on the fixed mold core (12) is 650mm in width and 2.5mm in thickness; the width L of a fan-shaped pouring channel cavity (14-1) on the pouring channel core-pulling block (14) is 650mm, and the thickness of the fan-shaped pouring channel cavity (14-1) is 17 mm.

3. The die for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell member according to claim 1, wherein the height of the hydraulic cylinder fixing vertical support (19) is 310 mm.

4. The die for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell member according to claim 1, wherein the cylinder diameter of the hydraulic cylinder (21) is 260mm, and the stroke is 50 mm.

5. The mold for semi-solid rheo-die-casting aluminum alloy 5G communication base station case shell member according to claim 1, wherein the cross section of the head of the fixed mold push rod (29) is rectangular, the size of the rectangular cross section is 6mm x 14mm, and the height of the fixed mold push rod (29) is 596 mm.

6. The die for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell member according to claim 1, wherein the cross section of the head of the movable die push rod (34) is circular, the diameter of the circular cross section is 20mm, and the height of the movable die push rod (34) is 609 mm.

7. The die for semi-solid rheo-die-casting aluminum alloy 5G communication base station case shell member according to claim 1, wherein the diameter of the third through hole (12-2) is 18 mm.

8. The die for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell member according to the claim 1, characterized in that the fixed die push plate (28) and the fixed die push-out fixing plate (27) are provided with a circular arc notch (39) in the direction of the sprue bush (37).

9. The use method of the mold for semi-solid rheo-die-casting the aluminum alloy 5G communication base station cabinet shell part according to claim 1, is characterized in that the use method of the mold for semi-solid rheo-die-casting the aluminum alloy 5G communication base station cabinet shell part comprises the following steps:

step three, closing the semi-solid rheological die casting mold;

sixthly, opening the die, and reserving the die casting in the fixed die core (12);

step seven, hydraulic cylinders of the hydraulic core pulling mechanism (6) and the pouring channel core pulling mechanism (7) are retracted, and the hydraulic core pulling and pouring channel core pulling sliding blocks (15) are pulled out;

eighthly, ejecting the slag ladle out of the movable mold ejection mechanism (11), and ejecting the rheological die casting out of the fixed mold ejection mechanism (2);

10. The use method of the mold for semi-solid rheo-die-casting the aluminum alloy 5G communication base station case shell member according to claim 9, wherein the semi-solid slurry in the step one is aluminum alloy A356 semi-solid slurry, aluminum alloy A357 semi-solid slurry, aluminum alloy A380 semi-solid slurry or Al-8Si-0.6Mg-0.15Cu-0.5Fe aluminum alloy semi-solid slurry.