CN104338932B - Light metal semisolid injection (mo(u)lding) machine - Google Patents

Abstract

The invention discloses a light metal semi-solid injection molding machine, which includes a feeding device, a melting device, a stirring device, a conveying device and an injection device. The front side of the feeding device is connected to the rear end of the melting device, and the front end of the melting device is connected to the stirring device. , the injection device is located below the melting device, the upper end of the conveying device is connected to the melting device, and the lower end of the conveying device is connected to the injection device. The present invention uses a metal bar blank as a raw material. When the heater melts the metal bar blank, it only needs to heat the metal bar blank to a semi-solid or liquidus temperature and maintain the minimum melting amount for continuous injection. It is not necessary to completely melt the metal raw material. Finally, the injection molding is completed while maintaining the form of molten metal, which requires lower temperature, saves energy, is environmentally friendly, and reduces costs; and the invention can realize metal melting, preparation, transportation and molding of semi-solid metal slurry, with simple process, high integration and high degree of automation. high.

Description

Light metal semi-solid injection molding machine

technical field

The invention relates to a light metal injection molding machine, which belongs to the technical field of nonferrous metal processing and manufacturing.

Background technique

At present, the manufacturing methods of light metal semi-solid products at home and abroad are mainly divided into three categories: rheological molding, thixotropic molding, and injection molding.

The process of the rheological forming process is as follows: During the cooling process of the metal from the liquid phase to the solid phase, vigorously stir to prepare a semi-solid metal slurry with a certain solid phase ratio, keep it warm, and finally convert the semi-solid The metal slurry is sent to the forming equipment for casting, extrusion, forging, rolling and other processes. Although the rheological forming process is simple, the energy consumption and casting cost are low, but the storage and transportation of the semi-solid metal slurry is inconvenient, and the automatic production of equipment is difficult. At present, there are few rheological forming equipment and processes that have been maturely applied. , most of which are still in the stage of laboratory research. The core device of the rheological molding process is described in the patent document "Method and apparatus for Injection molding of semi-solid metals" (US Patent 5,501,266; date of authorization is 1996.03.26). The problem with this process is that a melting furnace with a certain volume needs to be used to smelt the metal. Especially for magnesium alloys, various fluxes or protective atmospheres need to be applied during the smelting process to prevent the oxidation and combustion of magnesium alloys, which not only has certain safety hazards , and is detrimental to the environment.

The process of the thixoforming process is as follows: first solidify the semi-solid metal slurry into a billet, then blank according to the product size, and then reheat to the semi-solid temperature and send it to the forming equipment for processing. Since the semi-solid billet is solid, its transportation is relatively convenient, and automatic operation is easy to realize, so thixoforming is the mainstream technology of semi-solid forming at present. However, due to the need for billet casting, cutting, secondary heating and other processes, the cost of thixoforming is higher than that of rheoforming.

Injection molding is developed on the basis of the plastic injection molding process, and there are currently two process routes. One is to use metal particles as raw materials to prepare semi-solid metal slurry through external heating and screw agitation, and directly inject molding after metering. This process integrates the preparation, preservation, transportation and molding of semi-solid metal slurry, which better solves the problems existing in rheological and thixotropic forming, and has been applied in industrial production. The core device of this process is described in the patent document "Method and apparatus for the Injection molding of metal alloys" (US Patent 5,040,589; the date of authorization is 1991.08.20). However, the raw material used in the injection molding process is metal pellets, the preparation process of which is more complicated than that of conventional ingots, and the pellets have a large surface area and are easily oxidized, which may adversely affect the quality of cast products produced. Another injection molding process is to use metal round rods as raw materials, melt them in a circular melting cylinder, use the thermal expansion characteristics of the metal to realize the self-sealing function, avoid the oxidation and combustion of the melt, and transport the melt to the injection cylinder after meeting the process requirements for injection. forming. Chinese patent ZL 03806314.X discloses an injection device for a light metal injection molding machine, including a melting device, a plunger injection device, a billet supply device and connecting parts. The process equipment uses short rod-shaped light metal as a raw material, and the billet supply device The light metal raw material is sent to the melting device, and then the melting device prepares the light metal raw material into molten metal, and finally the molten metal is injected and molded through the plunger injection device. However, the preparation of this process must prepare light metal raw materials into molten metal, and the state of molten metal must also be maintained during the injection molding process. The process requires high temperature, high energy consumption, and increased production costs; moreover, if Incomplete melting of the light metal raw material will cause the plunger injection device to be blocked, resulting in the failure of the process equipment to work normally.

Based on the above technical status, a new type of light metal semi-solid injection molding machine is designed to avoid the inconvenience caused by the need to use metal particles as raw materials in the existing semi-solid injection molding process, directly use cast rods as raw materials, and complete melting in one equipment , semi-solid pulping, conveying and injection processes are a meaningful technical subject.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing semi-solid molding technology, and provide a light metal semi-solid injection molding machine which integrates the preparation, transportation and injection molding of semi-solid metal slurry.

The technical solution of the present invention is: a light metal semi-solid injection molding machine, which uses a metal bar blank as a processing raw material, including a feeding device, a melting device, a stirring device, a conveying device and an injection device, the front side of the feeding device and the rear of the melting device The injection device is located below the melting device, the upper end of the delivery device is connected to the melting device, and the lower end of the delivery device is connected to the injection device; the melting device includes a melting cylinder and a heater, the melting The barrel is a cylindrical cylinder, at least two heaters are wound around the outer periphery of the melting barrel, and an opening is provided at the lower part of the front side of the melting barrel; the feeding device includes a slideway, a support seat track, a pushing device, The first connecting block and the second connecting block, the sliding track and the supporting seat track are located between the first connecting block and the second connecting block, the supporting seat track is connected to the exit of the sliding track, and the first connecting block and the second connecting block are provided with a circular through hole, the diameter of the through hole is larger than the diameter of the metal rod blank, smaller than the inner diameter of the melting tube, the first connecting block and the melting tube of the melting device after the The second connection block is connected with the push device; the stirring device includes a motor, a conveyor belt and a screw, the head of the motor and the tail of the screw are connected by a conveyor belt, and the head of the screw is inserted from the front end of the melting tube into the melting tube connected; the injection device includes an injection head, an injection cylinder, an injection plunger and an injection cylinder, the injection cylinder is a cylindrical cylinder body, an opening is provided on the upper part of the front side of the injection cylinder, and the rear end of the injection head is connected to the front end of the injection cylinder. connection, the rear end of the injection cylinder is connected with the front end of the injection plunger, the rear part of the injection plunger is connected with the injection cylinder, and the injection plunger moves forward or backward through the expansion and contraction of the oil cylinder; the conveying device is connected with the front lower opening of the melting cylinder and Between the openings on the upper front side of the injection cylinder of the injection device, the melting cylinder communicates with the injection cylinder.

Further, the above-mentioned light metal semi-solid injection molding machine, wherein: the maximum diameter of the screw is smaller than the inner diameter of the melting cylinder, so that the screw can rotate unhindered in the melting cylinder, and a rod body is arranged inside the screw rod, and the rod body is located at The end of the screw tail is provided with a screw heater, and the heater transfers heat to the whole screw through the rod body to raise the temperature; the screw is covered with a water cooling block, which is located at the front of the head of the melting cylinder.

Further, the above-mentioned light metal semi-solid injection molding machine, wherein: the slideway is in a "<" type structure, and two stoppers are provided, namely the first stopper and the second stopper, the first stopper and the second stopper. The stopper device is installed above the exit of the slideway, and the second stopper device is installed below the slideway and is separated from the first stopper by a diameter of the metal rod blank.

Further, the above-mentioned light metal semi-solid injection molding machine, wherein: the pushing device includes a push rod and a push rod oil cylinder, the diameter of the push rod is smaller than the diameter of the through hole on the second connecting block, and the front end of the push rod is inserted into the first In the through hole of the second connecting block, the push rod oil cylinder is located at the rear side of the second connecting block, and is sleeved on the outer periphery of the rear part of the push rod, so that the push rod can move forward and backward.

Furthermore, in the above-mentioned light metal semi-solid injection molding machine, four heaters are wound on the outside of the melting cylinder, and the heating temperatures of the four heaters decrease step by step, and the heater at the head of the melting cylinder has the highest temperature. The heaters at the end of the melting drum are the coldest.

Further, the above-mentioned light metal semi-solid injection molding machine, wherein: the length of the melting cylinder can accommodate 3-4 metal rod blanks, and the melting cylinder and the through holes on the first connecting block and the through holes on the second connecting block are in the same position. same axis.

Still further, the above-mentioned light metal semi-solid injection molding machine, wherein: the conveying device includes a conveying pipe and a heater, the heater is arranged on the outer periphery of the conveying pipe, and a check valve is arranged on the conveying pipe, and the right side of the check valve The side is connected with a check valve oil cylinder, and the check valve is opened or closed through the expansion and contraction of the check valve oil cylinder.

Still further, the light metal semi-solid injection molding machine above, wherein: the outer periphery of the injection head of the injection device is provided with a heater, and the front end of the injection head is provided with a nozzle.

The outstanding substantive features and significant progress of the present invention are mainly reflected in: (1) the raw material directly adopts metal billet, which is easy to obtain, and the surface of the billet is finely turned without oxidation, and the processed product quality is good (2) the metal billet It can realize thermal expansion and self-sealing, without protective atmosphere or only a small amount of argon gas (mainly for magnesium alloy); (3) when melting metal billet, as long as the metal billet is heated to the liquidus temperature, and the continuous injection can be maintained The minimum melting amount is enough, and it is not necessary to completely melt the metal raw material and maintain the form of molten metal to complete the injection molding. The temperature requirement is low, energy saving and environmental protection, and cost reduction; (4) The preparation, transportation, and injection molding of semi-solid metal paste are integrated, and the operation Simple, secure, automated.

Description of drawings

Fig. 1 is the side view of the general drawing of light metal semi-solid injection molding machine;

Fig. 2 is a sectional view of the feeding device;

Fig. 3 is a schematic diagram of a melting device;

Fig. 4 is a schematic diagram of stirring device;

Fig. 5 is a schematic diagram of the conveying device;

Figure 6 is a schematic diagram of the injection device.

In the figure, the meanings of reference signs are: 1—melting device, 11—melting cylinder, 12a—first heater, 12a—first heater, 12b—second heater, 12c—third heater, 12d —The fourth heater, 2—feeding device, 21—sliding way, 22—support seat track, 23—support seat, 24—first material stopper, 25—second material stopper, 26 first connecting block, 27 —Second connection block, 28—Push rod, 29—Push rod oil cylinder, 210—Push rod displacement device, 3—Stirring device, 31—Motor, 32—Conveyor belt, 33—Screw, 331—Rod body, 332—Screw heating Device, 34—water cooling block, 35—screw support seat, 4—conveying device, 41—conveying pipe, 42—heater, 43—check valve, 44 check valve cylinder, 5—injection device, 51—injection cylinder, 511—heater, 52—injection head, 53—nozzle, 54—injection plunger, 55—injection cylinder, 56—pressure sensor, 6—metal bar blank, 7—rail, 71—rail cylinder.

detailed description

The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp.

As shown in Figure 1, the light metal semi-solid injection molding machine includes a feeding device 2, a melting device 1, a stirring device 3, a conveying device 4, and an injection device 5. The front side of the feeding device 2 is connected to the rear end of the melting device 1, and the melting device The front end of 1 is connected to the stirring device 3, the injection device 5 is located below the stirring device 3 and the melting device 1, and the delivery device 4 is connected between the melting device 1 and the injection device 5, so that the melting device 1 communicates with the injection device 5. It should be noted that the raw material used in this process equipment is short rod-shaped light metal (hereinafter referred to as metal rod blank 6).

The function of the feeding device 2 is to continuously send the metal bar blank 6 into the melting device 1, as shown in Figure 1 and Figure 2, the feeding device 2 includes a support seat 23, a slideway 21, a support seat track 22, a stopper, The pushing device, the first connecting block 26 and the second connecting block 27 , the supporting seat 23 , the slideway 21 and the supporting seat track 22 are located between the first connecting block 26 and the second connecting block 27 . Both the first connecting block 26 and the second connecting block 27 are provided with a circular through hole, the aperture of the through hole is slightly larger than the diameter of the metal bar blank 6, the first connecting block 26 is connected with the melting device 1, and the second connecting block 27 is connected with the melting device 1. The pushing device is connected. Pushing device comprises push rod 28 and push rod oil cylinder 29, and the diameter of push rod 28 is less than the through hole aperture on the second connection block 27, and the front end of push rod 28 is inserted in the through hole of second connection block 27, push rod oil cylinder 29 It is located at the rear side of the second connecting block 27 and is sleeved on the outer periphery of the rear part of the push rod 28 so that the push rod 28 can move forward and backward. The push rod 28 is provided with a push rod displacement device 210 for measuring the displacement of the push rod 28 . A support seat 23 is arranged below the slideway 21 and the support seat track 22, and is fixed on the workbench through the support seat 23. The slideway 21 is in a "<" shape structure, and the support seat track 22 is connected to the lower right side of the exit of the slideway 21 for supporting the metal bar blank 6 ready to be sent into the melting device 1 . The through hole on the first connecting block 26 , the through hole on the metal bar blank 6 on the support seat rail 22 and the second connecting block 27 are on the same axis. There are two stoppers, the first stopper 24 and the second stopper 25, both stoppers are installed near the exit of the slideway 21, and the first stopper 24 is installed at the exit of the slideway 21 above, the second stopper device 25 is installed below the slideway 21 and is separated from the first stopper device 24 at a distance of one metal bar blank diameter.

The working process of the feeding device 2 is as follows: when filling the metal bar blanks 6, multiple metal bar blanks can be put in from the entrance of the slideway 21 at one time, and the metal bar blanks slide along the slideway 21 to the At the exit of the slideway 21, the first loaded metal bar blank 6 first arrives at the exit of the slideway 21, and the first stopper device 24 blocks the exit of the slideway 21. If there is no metal bar blank in the support seat track 22, the metal bar needs to be supplemented blank, at this time, the second stopper device 25 moves upward to block the metal bar blanks except the metal bar blank at the exit from sliding down, and at the same time, the first stopper device 24 moves upward so that it is located at the slideway The metal bar blank at the exit of 21 slides into the support seat track 22, and then the push rod 28 moves forward under the action of the push rod oil cylinder 29, touches the metal bar blank located in the support seat track 22 and pushes the metal bar forward Push the metal bar blank to the melting device 1 on the front side of the feeding device 2; then, the push rod 28 retreats to the initial position under the action of the oil cylinder, and the first stopper device 24 moves downward to block the exit of the slideway 21, Simultaneously, the second stopper device 25 moves downward, so that the metal bar blank behind slides down to the exit of the slideway 21, and so on, repeating the above actions. According to the above process, the feeding device 2 can continuously feed the metal bar blank 6 into the melting device 1 .

The function of the melting device 1 is to melt the metal billet 6 to realize the melting or semi-solidification of the metal billet 6. As shown in Figures 1 and 3, the melting device 1 includes a melting cylinder 11 and a heater, and the melting cylinder 11 is a cylinder 3-4 metal rod blanks can be accommodated in the melting cylinder 11, the rear end of the melting cylinder 11 is connected to the front side of the first connecting block 26 of the feeding device 2, and the inner diameter of the melting cylinder 11 is larger than that of the first connecting block 26. The aperture of the hole, and the through hole on the melting cylinder 11 and the first connection block 26, the metal bar blank 6 on the support seat rail 22 and the through hole on the second connection block 27 are on the same axis; There is an opening for connecting the conveying device 4 described later, the outer circumference of the melting cylinder 11 is wound with the first heater 12a, the second heater 12b, the third heater 12c and the fourth heater 12d, and the first heater The heating temperatures from 12a to the fourth heater 12d decrease step by step. It should be noted that although four heaters are wound around the periphery of the melting cylinder 11 in Fig. It is a preferred solution to arrange four heaters on the periphery of the melting cylinder 11 .

The working process of the melting device 1 is as follows: the metal bar blank 6 is sent into the melting cylinder 11 by the feeding device 2. Since the heating temperature of the heater decreases step by step, the first heater 12a located at the head of the melting cylinder 11 has the highest temperature, and is located at the melting The fourth heater 12d at the tail of the cylinder 11 has the lowest temperature, so the temperature of the head of the melting cylinder 11 is high and the temperature of the tail is low. Correspondingly, the temperature of the head of the metal billet is high and the temperature of the tail is low. As the temperature rises, the billet is heated and expands. On the one hand, the expansion gradually expands from the head of the melting cylinder 11 to the tail, so that the air or argon in the gap between the metal billet and the cylinder wall in the cold state can be released. discharge to the rear. On the other hand, due to the existence of the temperature gradient, complete melting of the metal can be achieved at the head of the melting tube 11, and the metal bar blank can still seal the melting tube 11 in a solid or softened form in the middle, but as the temperature increases from the middle to the tail, Gradually decreasing, the size expansion produced by the metal bar blank is not enough to seal the melting tube 11, so that the length of the expansion sealing section of the solid bar can be controlled by temperature, thereby reducing unnecessary frictional resistance when the push rod 28 moves. However, it should be noted that in order to ensure the reliability of the self-expanding and sealing function of the metal billet and the continuity of the feeding operation, the sealing section is preferably located in the middle or at the end of the middle part of the entire injection cylinder 51, so as not to push the rod when feeding. 28 back, causing the melt leakage at the head of the syringe to flow backwards.

The function of the stirring device 3 is to crush and stir the semi-solid metal slurry, as shown in Figure 1 and Figure 4, the stirring device 3 includes a motor 31, a conveyor belt 32 and a screw 33, and the head of the motor 31 and the tail of the screw rod 33 pass through the conveyor belt conveyor belt 32 connection, the head of the screw 33 is inserted into the front end of the melting cylinder 11 and connected with the melting cylinder 11, so that a part of the screw 33 is located in the melting cylinder 11, and the other part is located at the front side of the melting cylinder 11 for stirring into melting or semi-solid metal paste. The inside of the screw 33 is provided with a screw heater 332 and a rod body 331. The screw heater 332 is connected to the end of the rod body 311 located at the tail of the screw rod 33. The heater 332 transmits heat to the entire screw rod 33 through the rod body 331 to raise the temperature. Prevent the temperature of the screw 33 from being too low, causing the molten or semi-solid metal slurry in the melting cylinder 11 to turn back to a solid state when it is cooled. The diameter is smaller than the inner diameter of the melting cylinder 11. The screw 33 is covered with a water cooling block 34, and the water cooling block 34 is located at the front end of the head of the melting cylinder 11, the purpose of which is to prevent the high temperature of the screw 33 from being transmitted to the transmission part behind, causing damage to the equipment. The screw rod 33 is additionally provided with a screw rod support seat 35 for supporting the screw rod 33 .

The working process of the stirring device 3 is as follows: when the metal billet reaches the liquidus above 10°C, the motor 31 of the stirring device 3 is started, and the screw 33 is driven by the conveyor belt 32 at a speed of 100-300r/min to melt or semi-solid. The metal paste is stirred. During the stirring process, on the one hand, because the temperature of the screw 33 is lower than that of the melt, it will have a certain cooling effect on the molten metal slurry, causing it to crystallize; on the other hand, the shear force generated by the rotation can break the crystallization, to form spherical crystals. After stirring for 10-60 seconds, the semi-solid metal slurry reaches the required solid phase ratio and structure state, and then is transported to the injection device 5 via the delivery device 4 described later.

The function of the conveying device 4 is to convey the semi-solid metal slurry to the injection device 5 described later. As shown in FIG. 1 and FIG. 6 , the conveying device 4 includes a conveying pipeline 41 , a check valve 43 and a heater 42 . The conveying pipe 41 is a cylindrical cylinder, the upper end of the conveying pipe 41 is connected to the opening on the lower front side of the melting cylinder 11, and the lower end is connected to the opening on the upper front side of the injection cylinder 51 described later. The opening of the melting cylinder 11 corresponds to the opening position of the injection cylinder 51 , have the same size, so that the conveying device 4 connected between the melting cylinder 11 and the injection cylinder 51 is in a vertical state. The semi-solid metal slurry flows from the melting cylinder 11 of the melting device 1 to the injection cylinder 51 of the injection device 5 through the delivery pipe 41 . The check valve 43 is arranged on the conveying pipeline 41 , and the right side of the check valve 43 is connected with a check valve oil cylinder 44 .

The working process of the delivery device 4 is as follows. When the semi-solid metal slurry needs to be delivered to the injection device 5, the check valve 43 is opened by retracting the check valve cylinder 44, and the solid slurry falls into the injection device 5 under its own gravity; When the injection device 5 is filled and there is no need to replenish the semi-solid metal slurry, the check valve 43 is closed by the forward extension of the check valve cylinder 44, and the semi-solid metal slurry is blocked by the check valve 43 and cannot enter the injection device. 5, and can prevent the semi-solid metal slurry in the injection device 5 from flowing backward.

The injection device 5 is used for injection molding the semi-solid metal slurry, as shown in Figure 1 and Figure 6, the injection device 5 includes a nozzle 53, an injection head 52, an injection cylinder 51, an injection plunger 54 and an injection cylinder 55, and the nozzle 53 Installed on the front end of the injection head 52, there are heaters around the injection head 52, the injection head 52 and the nozzle to prevent the semi-solid metal slurry from cooling back to a solid state, and the nozzle part heater needs to ensure that the melt at the exit It can be solidified to form a cold plug to prevent external air from entering, and the cold plug can be driven into the runner by pressure during injection. The injection cylinder 51 is a cylindrical cylinder, and the upper part of the front side of the injection cylinder 51 is provided with an opening for connecting the delivery device 4. The rear end of the injection head 52 is inserted from the front end of the injection cylinder 51 to connect with the injection cylinder 51, and the injection plunger 54 Inserted from the injection cylinder 51, the rear end is connected with the injection cylinder 51, and the rear part of the injection plunger 54 is connected with the injection cylinder 55, and the injection plunger 54 realizes forward or backward through the expansion and contraction of the cylinder. A pressure sensor 56 is provided on the rodless chamber side of the injection cylinder 55 .

The working process of the injection device 5 is as follows: the semi-solid metal slurry enters the injection cylinder 51 of the injection device 5 through the conveying device 4, and the injection plunger 54 in the injection cylinder 51 stays at a set position according to the injection volume. When the metal slurry accumulates to a certain amount in the injection cylinder 51, the pressure sensor 56 installed on the side of the rodless cavity of the injection cylinder 55 will generate pressure. When the pressure reaches a certain value, the check valve 43 will be closed, and the semi-solid metal slurry will stop. Conveying; when the semi-solid metal slurry in the injection cylinder 51 meets the process requirements, the air plug of the nozzle 53 is opened, and the injection plunger 54 moves forward to push the semi-solid metal slurry under the push of the injection cylinder 55, so that the semi-solid metal slurry The metal paste passes through the injection head 52 and then is sprayed out from the nozzle 53, finally completing the injection molding.

The light metal semi-solid injection molding machine of the present invention cooperates with each other of the above-mentioned devices to complete the injection molding. When using the present invention, it is necessary to start the heater and the screw heater 332 on the melting device 1, the conveying device 4 and the injection device 5 in advance, and turn the melting device 1. Stirring device 3, conveying device 4 and injection device 5 are preheated. After reaching the specified preheating temperature, 5 to 12 metal rod blanks 6 are removed from the plastic protective film and put into the slideway 21 of the feeding device 2. The diameter of the metal rod blank 6 is 0.5-2 mm smaller than the inner diameter of the melting cylinder 11 . The length is about 250-350mm. If it is to produce magnesium alloy products, it is necessary to fill the entire melting cylinder 11 , delivery pipe 41 and injection cylinder 51 with argon gas first, so as to discharge the air therein. Start feeding device 2 afterwards, and metal bar blank 6 rolls into support seat track 22 one by one under the control of stopper device, then under the promotion of push rod 28, is stuffed into from the afterbody of melting cylinder 11. The heater on the melting device 1 heats the metal bar blank 6, so that the metal bar blank 6 becomes molten or semi-solid metal slurry from the head, and then starts the motor 31 of the stirring device 3, and the motor 31 passes through the conveyor belt 32 drives the screw 33 to stir the metal slurry. After stirring the semi-solid metal slurry to reach the required solid phase ratio and tissue state, the check valve 43 on the delivery pipeline 41 is opened under the action of the check valve oil cylinder 44, The semi-solid metal slurry just enters the injection barrel 51 of the injection device 5 . Under the action of the push rod 28 of the feeding device 2, the semi-solid metal slurry continuously enters the injection cylinder 51 along the delivery pipe 41 under the action of the movement of the push rod 28. When the semi-solid metal slurry accumulates in the injection cylinder 51 to a certain When measuring, the pressure sensor 56 installed on the side of the rodless cavity of the injection cylinder 55 will generate pressure. When a certain pressure value is reached, the check valve 43 will be closed, and the delivery of semi-solid metal slurry will be stopped, and the screw 33 will be set according to the process parameters. Can continue spinning or stop. After the semi-solid metal slurry in the injection cylinder 51 meets the process requirements, the air plug of the nozzle 53 is opened, and the entire equipment of the injection machine is placed on a rail 7 and driven by the rail cylinder 71, it moves to the mold side and docks. After the injection machine is in place, the injection plunger 54 injects the semi-solid metal slurry into the mold at the injection pressure and injection speed required by the process, and maintains the pressure for a period of time. After it has cooled sufficiently, the casting product is taken out. Then start the next casting time.

After several casting times, after a metal billet is consumed, that is, after the push rod 28 of the feeding device 2 moves forward beyond the length of a billet, the push rod displacement device 210 sends out a signal, and the push rod 28 moves back to the initial state. position, the feeding device 2 replenishes a metal bar blank 6 again, and repeats this, so that the entire production process can be carried out continuously.

As mentioned above, the light metal semi-solid forming machine of the present invention adopts metal billet as raw material, and when the heater melts the metal billet, as long as the metal billet is heated to the liquidus temperature and the minimum melting amount for continuous injection can be maintained. Yes, and the injection molding can be completed in the form of metal semi-solid slurry, and it is not necessary to completely melt the metal raw material to complete the injection molding in the form of molten metal, the temperature requirement is low, energy saving and environmental protection, and cost reduction; and the invention can realize metal melting, semi-solid The preparation, transportation and molding of solid metal paste have simple process, high degree of integration and high automation, which better solve some problems existing in the current semi-solid processing technology.

Of course, the above are only typical examples of the present invention. In addition, the present invention can also have other multiple specific implementation modes. All technical solutions formed by equivalent replacement or equivalent transformation all fall within the scope of protection claimed by the present invention. Inside.

Claims (8)

1. Light metal semi-solid injection molding machine, using metal billets as raw materials for processing, including feeding device, melting device, stirring device, conveying device and injection device, the front side of the feeding device is connected with the rear end of the melting device, the The injection device is located below the melting device, the upper end of the conveying device is connected to the melting device, and the lower end of the conveying device is connected to the injection device; it is characterized in that: the melting device includes a melting cylinder and a heater, and the melting cylinder is Cylindrical cylinder body, at least two heaters are wound around the outer periphery of the melting cylinder, and an opening is provided at the lower part of the front side of the melting cylinder; the feeding device includes a slideway, a support seat track, a pushing device, a first The connecting block and the second connecting block, the sliding track and the supporting seat track are located between the first connecting block and the second connecting block, the supporting seat track is connected to the exit of the sliding track, the first connecting block and the second connecting block Both connecting blocks are provided with a circular through hole, the diameter of which is larger than the diameter of the metal rod blank, and smaller than the inner diameter of the melting tube, the first connecting block is connected to the rear end of the melting tube of the melting device , the second connection block is connected with the pushing device; the stirring device includes a motor, a conveyor belt and a screw, the head of the motor and the tail of the screw are connected by a conveyor belt, and the head of the screw is inserted from the front end of the melting cylinder to be connected to the melting cylinder; The injection device includes an injection head, an injection cylinder, an injection plunger and an injection cylinder, the injection cylinder is a cylindrical cylinder body, an opening is arranged on the upper part of the front side of the injection cylinder, the rear end of the injection head is connected with the front end of the injection cylinder, The rear end of the injection cylinder is connected to the front end of the injection plunger, and the rear part of the injection plunger is connected to the injection cylinder, and the injection plunger is moved forward or backward through the expansion and contraction of the oil cylinder; the delivery device is connected to the front lower opening of the melting cylinder and the injection device Between the openings on the upper front side of the injection cylinder, the melting cylinder is connected to the injection cylinder; the maximum diameter of the screw is smaller than the inner diameter of the melting cylinder, so that the screw can rotate unhindered in the melting cylinder, and a rod is arranged inside the screw The end of the rod at the tail of the screw is provided with a screw heater, and the heater transfers heat to the whole screw through the rod to raise the temperature; the screw is covered with a water cooling block, which is located at the front of the head of the melting cylinder . 2. The light metal semi-solid injection molding machine according to claim 1, characterized in that: the slideway has a "<" structure, and there are two stoppers, namely the first stopper and the second stopper A material device, the first material stop device is installed above the exit of the slideway, and the second material stop device is installed below the slideway and is separated from the first material stopper by a distance of one metal bar blank diameter. 3. The light metal semi-solid injection molding machine according to claim 1, wherein the pushing device comprises a push rod and a push rod oil cylinder, the diameter of the push rod is smaller than the diameter of the through hole on the second connecting block, and The front end of the push rod is inserted into the through hole of the second connecting block, and the push rod oil cylinder is located at the rear side of the second connecting block, and is sleeved on the outer periphery of the rear part of the push rod, so that the push rod can move forward and backward. 4. The light metal semi-solid injection molding machine according to claim 1, characterized in that four heaters are wound on the outside of the melting cylinder, and the heating temperature of the four heaters decreases step by step, located at the head of the melting cylinder The heater temperature is the highest, and the heater temperature at the end of the melting cylinder is the lowest. 5. The light metal semi-solid injection molding machine according to claim 1, characterized in that 3-4 metal rods can be accommodated in the melting cylinder, and the melting cylinder is connected with the through hole on the first connecting block and the second connection The through holes on the block are on the same axis. 6. The light metal semi-solid injection molding machine according to claim 1, characterized in that: the conveying device comprises a conveying pipe and a heater, and the heater is arranged on the outer periphery of the conveying pipe. 7. The light metal semi-solid injection molding machine according to claim 6, characterized in that: the delivery pipeline is provided with a check valve, the right side of the check valve is connected with a check valve oil cylinder, and the check valve passes through the check valve The oil cylinder telescopically realizes opening or closing. 8. The light metal semi-solid injection molding machine according to claim 1, characterized in that: a heater is arranged on the outer periphery of the injection head, and a nozzle is arranged on the front end of the injection head.