CN111451475B

CN111451475B - Precision part die-casting device

Info

Publication number: CN111451475B
Application number: CN202010310149.5A
Authority: CN
Inventors: 王柏山
Original assignee: Foshan Yizhu Metal Technology Co ltd
Current assignee: Foshan Yizhu Metal Technology Co.,Ltd.
Priority date: 2020-04-19
Filing date: 2020-04-19
Publication date: 2021-10-26
Anticipated expiration: 2040-04-19
Also published as: CN111451475A

Abstract

The invention relates to the technical field of die casting machines and discloses a precision part die-casting device which comprises a crucible, wherein a shell is fixedly arranged on the side wall of the bottom of the inner wall of the crucible, a guide plate is fixedly arranged between the lower surface of the shell and the bottom of the inner wall of the crucible in a crossed mode at intervals, a magnetic-type automatic opening and closing valve is arranged at a feed inlet of the crucible, when a pressure rod is pressed downwards, the valve is driven to close the feed inlet by utilizing magnetic attraction, a second magnetic block arranged at the lower part in the feed inlet of the crucible is used for sucking a first magnetic block, the valve is ensured to be capable of closing the feed inlet, so that a large amount of metal liquid can not enter an immersed telescopic rod from the feed inlet when the telescopic rod is pressed downwards, the metal liquid can not be adhered to the feed inlet, and therefore, the scum can not be generated by oxidation reaction on the metal liquid, and the telescopic rod can not be blocked in a pressure chamber due to scum, the quality of the metal liquid entering the pouring kettle is also ensured, thereby improving the quality of the finished product.

Description

Precision part die-casting device

Technical Field

The invention relates to the technical field of die casting machines, in particular to a die casting device for a precision part.

Background

The die casting machine mainly divide into hot chamber die casting machine and cold chamber die casting machine two kinds, wherein hot chamber die casting machine mainly is with the molten state in the crucible, the metal liquid of board molten state fills the mould in the extrusion force effect, then the cooling shaping to hot chamber die casting machine wide application in the precision part die-casting of industrial parts such as car, motorcycle accessories, instrument and meter, metal five metals, but current hot chamber die casting machine has following problem all the time:

1. because hot chamber die casting machine utilizes the lift extrusion mode of hydraulic stem in the plenum to extrude the nozzle department with the metal liquid that fills in the plenum, extrude into the mould from the nozzle again, the whole material kettle that waters of hot chamber die casting machine is soaked in the metal liquid for a long time, but the hydraulic stem can make the pars contractilis can be repeated stretch into and extract the metal liquid because its lift compression mode, and such mode can make the metal liquid of adhesion take place oxidation reaction when air contact on the hydraulic stem, thereby produce the dross of caking, pile up along with the dross and increase, can lead to the telescopic link of hydraulic stem to bring the dross into the plenum when extrudeing the plenum, can lead to telescopic link and plenum edge accumulation dross on the one hand, can block dead telescopic link for a long time, on the other hand the dross can get into the material kettle, spout in the mould, thereby influence final die-casting shaping product quality.

2. The material kettle is extruded with the metal liquid to current hot chamber die casting machine because it needs the telescopic link to produce the extrusion force to the pressure chamber, so there is good seal between telescopic link and the pressure chamber, just so restricted the feed end of the material kettle of submergence in the metal liquid must set up on upper portion, and such mode can make the metal liquid in the crucible only the part on upper portion can get into the material kettle through the feed inlet, most metal liquid of bottom can't utilize at all, as long as the plane of metal liquid is less than the feed inlet just must increase the raw materials, cause the low-usage of resource, and because the liquid of bottom is in quiescent condition in for a long time in current crucible, not only can cause the sediment of metal liquid, also can further influence the utilization ratio of raw materials simultaneously.

Disclosure of Invention

The invention provides a precision part die-casting device which has the advantages of high utilization rate of raw materials, high quality of finished products and long service life of equipment, and solves the problems in the background technology.

The invention provides the following technical scheme: a precise part die-casting device comprises a crucible, wherein a shell is fixedly installed on the side wall of the bottom of the inner wall of the crucible, guide plates are fixedly installed between the lower surface of the shell and the bottom of the inner wall of the crucible in a crossed mode at intervals, an outlet is formed in one end of the shell, an inlet is formed in the other end of the shell, a guide pipe is fixedly connected to the outlet, the other end of the guide pipe is fixedly connected to a feed inlet of a pouring kettle, the outlet is located on one side where the pouring kettle is installed, a vertical pressure chamber is formed in the right side of the interior of the pouring kettle, the bottom of the pressure chamber is communicated with a pouring kettle, a sliding groove is formed in one side, located at the feed inlet, of the upper portion of the pressure chamber, a valve is movably connected in the sliding groove, limit blocks are fixedly installed at two ends of the upper portion of the valve, a first magnetic block is fixedly installed at the bottom of one side, close to the interior of the pressure chamber, of the bottom of the feed inlet of the pouring kettle, a second magnetic block is fixedly installed at one side, which is located at the inner wall of the pressure chamber, the inner part of the pressure chamber of the material pouring kettle is movably connected with a pressure rod, a third magnetic block with the gravity center coincident with the gravity center of the first magnetic block is fixedly arranged on an extrusion piston at the bottom of the pressure rod, the top of the pressure rod is fixedly connected with a push plate, a hydraulic rod push rod is fixedly arranged in the middle of the upper surface of the push plate, a connecting seat is fixedly arranged at the opposite end of the lower surface of the push plate, which is positioned at the pressure rod, a first connecting rod is movably connected with the connecting seat, one end of the first connecting rod is fixedly connected with a first rotating shaft, a second connecting rod is movably sleeved on the first rotating shaft, a second rotating shaft is fixedly arranged in the middle of the second connecting rod, the second rotating shaft is movably sleeved on the supporting seat at the top of the crucible, one end of the second connecting rod is movably connected with a third connecting rod, one end of the third connecting rod is fixedly arranged with a third rotating shaft, and the third rotating shaft is movably sleeved inside a fourth connecting rod, the middle part fixed mounting that the crucible inner wall is located import one side has a spacing lantern ring, the spacing removal of fourth connecting rod in the spacing lantern ring, the bottom fixed mounting of fourth connecting rod has the tamponade, one side fixed mounting that the shell upper surface is located the export has the impact box, the space intercommunication that the bottom of impacting the box runs through the lower surface of shell and the bottom part of crucible inner wall and constitutes.

Preferably, the valve is rectangular and has a transverse and longitudinal length greater than the diameter of the feed opening of the watering can.

Preferably, the shell, the guide plates, the outlet and the inlet form a liquid flowing device, the inclined direction of the guide plates is the flowing direction of liquid inside the guide plates, the first guide plate is installed at the bottom of the inner wall of the shell, the upper part of the first guide plate is not in contact with the top of the inner wall of the shell, the second guide plate is installed at the top of the inner wall of the shell, the lower part of the second guide plate is not in contact with the bottom of the inner wall of the shell, and subsequent installation is sequentially and alternately carried out.

Preferably, the magnetism of the second magnetic block is the same as that of the third magnetic block, the magnetism of the first magnetic block is opposite to that of the second magnetic block, and the first magnetic block, the second magnetic block and the third magnetic block are made of alnico.

Preferably, the upper surface of the piston portion of the bottom of the plunger is an inclined surface inclined downward from the center to the outside.

Preferably, the central axis of the collar part of the spacing collar coincides with the central axis of the inlet, and the press plug is in clearance fit with the inlet.

Preferably, the opening of the feeding end of the impact box is larger than the opening of the discharging end, and the bottom of the opening of the discharging end is in a downward concave arc shape.

The invention has the following beneficial effects:

1. this precision part die-casting device, it inhales the automatic valve that opens and shuts of formula to be provided with magnetism through the feed inlet department at the crucible, can utilize magnetic attraction to drive the feed inlet that the valve closed the crucible when the depression bar pushes down, and utilize the second magnetic path of installing the lower part in the crucible feed inlet to hold first magnetic path, guarantee that the valve can close the feed inlet, just so can not have a large amount of metal liquid to get into the submergence telescopic link from the feed inlet when the telescopic link pushes down, metal liquid just can not be because the work adhesion of telescopic link is on it, just can not take place oxidation reaction and produce the dross on it, so both guaranteed that the telescopic link can not die in pressing the room because the dross card, the quality of the metal liquid in the entering pouring kettle has also been guaranteed, thereby improve off-the-shelf quality.

2. This precision part die-casting device, be provided with through the lower part at the crucible inner wall and promote liquid flow device, utilize the telescopic action of the hydraulic stem on upper portion, drive the tamponade with the help of mechanical structure's transmission and extrude in to the import, make the metal liquid among the device flow wherein, enter into the feed inlet through the pipe at last, then enter into and water the material kettle, the metal liquid that can guarantee in the crucible like this has fine mobility, not only make the metal liquid of crucible bottom can get into the feed inlet, improve the inside metal liquid's of whole crucible utilization ratio, simultaneously because inhale the material position in the bottom, will reduce the influence that the height of metal liquid level is normal to the feeding like this, avoided repetitious a small amount of reinforced many times, and the work efficiency is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of a fluid flow device in accordance with the present invention;

FIG. 3 is a bottom view of the structural strut of the present invention;

FIG. 4 is a schematic view of a valve according to the present invention;

FIG. 5 is an enlarged view of the point A in FIG. 1;

FIG. 6 is an enlarged view of the point B in FIG. 2;

FIG. 7 is a schematic cross-sectional view of the structural impingement box attachment of the present invention.

In the figure: 1. a crucible; 2. a housing; 3. a baffle; 4. an outlet; 5. an inlet; 6. a conduit; 7. a material pouring kettle; 8. a chute; 9. a valve; 10. a limiting block; 11. a first magnetic block; 12. a second magnetic block; 13. a pressure lever; 14. a third magnetic block; 15. pushing the plate; 16. a hydraulic rod push rod; 17. a connecting seat; 18. a first link; 19. a first rotating shaft; 20. a second link; 21. a second rotating shaft; 22. a third link; 23. a third rotating shaft; 24. a limiting lantern ring; 25. a fourth link; 26. pressing and plugging; 27. and (4) impacting the box.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, a precision part die-casting device comprises a crucible 1, a shell 2 is fixedly installed on the side wall of the bottom of the inner wall of the crucible 1, guide plates 3 are fixedly installed between the lower surface of the shell 2 and the bottom of the inner wall of the crucible 1 at intervals in a crossed manner, an outlet 4 is formed at one end of the shell 2, an inlet 5 is formed at the other end of the shell 2, a guide pipe 6 is fixedly connected to the outlet 4, the other end of the guide pipe 6 is fixedly connected to a feed port of a pouring kettle 7, the outlet 4 is located at one side where the pouring kettle 7 is installed, a vertical pressure chamber is formed at the right side inside the pouring kettle 7, the bottom of the pressure chamber is communicated with a pouring channel inside the pouring kettle 7, a chute 8 is formed in one side, located at the feed port, of the upper portion of the pressure chamber, a valve 9 is movably connected in the chute 8, limit blocks 10 are fixedly installed at two ends of the upper portion of the valve 9, a first magnet 11 is fixedly installed at the bottom of one side, which is close to the inside of the valve 9, a second magnetic block 12 is fixedly arranged on one side of the inner wall of the pressure chamber at the bottom of the feeding hole of the pouring kettle 7, a pressure rod 13 is movably connected inside the pressure chamber of the pouring kettle 7, a third magnetic block 14 with the gravity center coinciding with the gravity center of the first magnetic block 11 is fixedly arranged on an extrusion piston at the bottom of the pressure rod 13, a push plate 15 is fixedly connected to the top of the pressure rod 13, a hydraulic rod push rod 16 is fixedly arranged in the middle of the upper surface of the push plate 15, a connecting seat 17 is fixedly arranged at the opposite end of the lower surface of the push plate 15, a first connecting rod 18 is movably connected to the connecting seat 17, a first rotating shaft 19 is fixedly connected to one end of the first connecting rod 18, a second connecting rod 20 is movably sleeved on the first rotating shaft 19, a second rotating shaft 21 is fixedly arranged in the middle of the second connecting rod 20, the second rotating shaft 21 is movably sleeved on the supporting seat at the top of the crucible 1, and a third connecting rod 22 is movably connected to one end of the second connecting rod 20, one end fixed mounting of third connecting rod 22 has third pivot 23, third pivot 23 activity suit is in the inside of fourth connecting rod 25, the middle part fixed mounting that the inner wall of crucible 1 is located import 5 one side has spacing lantern ring 24, fourth connecting rod 25 is spacing removal in spacing lantern ring 24, the bottom fixed mounting of fourth connecting rod 25 has tamponade 26, one side fixed mounting that the upper surface of shell 2 is located export 4 has impact box 27, the space intercommunication that the bottom of impacting box 27 runs through the lower surface of shell 2 and the bottom part of crucible 1 inner wall and constitute.

Wherein, the valve 9 is rectangle and its horizontal and longitudinal length is greater than the diameter of the feed inlet of the pouring kettle 7, can completely isolate the liquid in the conduit 6 from entering the pressure chamber when the valve 9 is pulled down and closed, so that the upper part of the pressure lever 13 can not be immersed in the metal liquid, thereby not only avoiding the scum of the metal liquid after the contact oxidation with the air along with the lifting of the pressure lever 13, reducing the waste of raw materials, but also avoiding the scum generated by the part in the pressure chamber, not only improving the purity of the metal liquid in the pressure chamber, improving the quality of subsequent finished products, and also ensuring that the compression piston of the pressure lever 13 can not be blocked with the pressure chamber due to the existence of the scum, thereby ensuring the normal operation of the equipment.

Wherein, the shell 2, the guide plate 3, the outlet 4 and the inlet 5 form a liquid flowing device, the inclined direction of the guide plate 3 is the flowing direction of the liquid in the guide plate 3, wherein, the first guide plate 3 is arranged at the bottom of the inner wall of the shell 2, the upper part is not contacted with the top of the inner wall of the shell 2, the second guide plate 3 is arranged at the top of the inner wall of the shell 2, the lower part is not contacted with the bottom of the inner wall of the shell 2, the subsequent installation is carried out in turn and crossly, because the metal liquid flows in the liquid flowing device, the inclined guide plate 3 can ensure the normal flowing of the metal liquid in the shell, and can not generate blocking accumulation with the arrangement of the guide plate 3 at the fixed node thereof, the fluidity of the metal liquid is improved, and the repeated bending flowing structure can promote the mixed flow of the metal liquid, thus, the flowing mixing of the metal liquid at the bottom in the crucible 1 can be better, the deposition is avoided, and the utilization rate of the metal liquid at the bottom in the crucible 1 is improved.

Wherein, the magnetism of the second magnetic block 12 is the same as that of the third magnetic block 14, the magnetism of the first magnetic block 11 is opposite to that of the second magnetic block 12 and that of the third magnetic block 14, the first magnetic block 11, the second magnetic block 12 and that of the third magnetic block 14 are all made of alnico, because the material can be demagnetized only when the temperature is 850 ℃, so that the magnetism can be normally kept at the working temperature of the hot chamber die casting machine, when the pressure rod 13 is pressed down, the third magnetic block 14 can overcome the resistance of the metal liquid in the conduit 6 to pull the first magnetic block 11 downwards by using the opposite magnetism, so that the valve 9 closes the feed inlet, and when the first magnetic block 11 falls to the bottom of the feed inlet, and then is adsorbed with the second magnetic block 12 again, further ensuring that the residual metal liquid in the conduit 6 can not flow into the pressure chamber, avoiding the generation of scum and further ensuring the quality of finished products and the normal operation of equipment.

The upper surface of the piston part at the bottom of the pressure lever 13 is an inclined surface inclining downwards from the center to the outside, and the upper surface of the piston is arranged to be the inclined surface due to the clearance fit between the existing piston and the pressure chamber, so that the liquid can automatically slide downwards on the inclined surface when the straight rod part of the pressure lever 13 enters the liquid and automatically flows into the pressure chamber from the clearance between the piston and the pressure chamber, thereby avoiding the scum generated by the long-time retention of the metal liquid on the upper surface of the piston, further reducing the generation of the scum and improving the quality of the finished product.

Wherein, the central axis of the lantern ring part of the spacing lantern ring 24 coincides with the central axis of the inlet 5, and the press plug 26 is in clearance fit with the inlet 5, so that the fourth connecting rod 25 can push the press plug 26 to move up and down in the vertical direction, and the clearance fit can enable the press plug 26 to have enough pressure to drive the flow of the liquid inside the liquid flowing device when being pressed into the inlet 5, thereby ensuring the fluidity of the liquid at the bottom in the crucible 1 and improving the utilization rate of the raw materials.

Wherein, the opening of the feeding end of the impact box 27 is larger than the opening of the discharging end, and the bottom of the opening of the discharging end is in a downward concave arc shape, when the press plug 26 is pressed into the inlet 5, the metal liquid in the liquid flow device can flow to one end of the outlet 4, one part of the metal liquid can enter the pressure chamber along the guide pipe 6, when the liquid in the pressure chamber is full, the redundant liquid can enter the pressure chamber from the feeding end of the impact box 27, and the liquid flow rate of the discharging end is increased due to the opening difference of the feeding end and the discharging end, and the liquid at the outlet end can impact the metal liquid deposited on the upper surface of the shell 2 in the horizontal direction by combining the concave arc arrangement of the outlet section, so that the metal liquid at the bottom can flow to one end of the inlet 5, the metal liquid at the bottom can generate circular flow, thereby avoiding the influence of the deposition generated by the metal liquid stillness on the finished product, and simultaneously, the liquid at the bottom of the crucible 1 can be well utilized, the utilization rate of raw materials is improved.

When the device works, the hydraulic rod push rod 16 extends and retracts under the action of an external hydraulic cylinder, when the hydraulic rod push rod 16 ascends, the hydraulic rod push rod 16 drives the connecting seat 17 to ascend by utilizing the push plate 15, the connecting seat 17 pulls the first rotating shaft 19 to ascend through the first connecting rod 18, so that the second connecting rod 20 is pulled to rotate around the second rotating shaft 21, the part of the second rotating shaft 21, which is positioned inside the crucible 1, descends, the second connecting rod 20 pushes the third connecting rod 22 downwards, the third connecting rod 22 pushes the fourth connecting rod 25 downwards through the third rotating shaft 23, so that the fourth connecting rod 25 is limited in the limiting sleeve ring 24 to move downwards in a straight line, the fourth connecting rod 25 pushes the press plug 26 to enter the inlet 5, so that the metal liquid inside the liquid flowing device flows in a fluid channel formed by the guide plate 3 arranged in the liquid flowing device, and is extruded from the outlet 4 to enter the conduit 6, and meanwhile, the push plate 15 also lifts the push rod 13, so that the piston part at the bottom of the valve body clamps the first magnetic block 11, the valve 9 is pulled upwards, the feeding hole is opened, the metal liquid in the guide pipe 6 enters the pouring kettle from the feeding hole, then the hydraulic rod push rod 16 descends, the transmission device at the right part moves in the reverse direction when the hydraulic rod push rod 16 ascends, finally the press plug 26 is separated from the inlet 5, the metal liquid in the liquid flowing device is supplemented, the press rod 13 is pressed downwards by the push plate 15, the valve 9 is pulled downwards by the magnetic attraction between the third magnetic block 14 and the first magnetic block 11, the valve 9 stops moving after the first magnetic block 11 contacts the second magnetic block 12, the valve 9 is closed by the magnetic attraction between the first magnetic block 11 and the second magnetic block 12 again, then the piston part at the bottom of the press rod 13 enters the pressure chamber, the metal liquid in the pouring kettle is extruded into a subsequent nozzle, and finally, die casting in a die.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a precision parts die-casting device, includes crucible (1), its characterized in that: the crucible pot is characterized in that a shell (2) is fixedly mounted on the side wall of the bottom of the inner wall of the crucible pot (1), guide plates (3) are fixedly mounted between the lower surface of the shell (2) and the bottom of the inner wall of the crucible pot (1) in a crossed mode at intervals, an outlet (4) is formed in one end of the shell (2), an inlet (5) is formed in the other end of the shell (2), a guide pipe (6) is fixedly connected onto the outlet (4), the other end of the guide pipe (6) is fixedly connected to a feeding port of a pouring kettle (7), the outlet (4) is located on one side where the pouring kettle (7) is mounted, a vertical pressure chamber is formed in the right side of the inner portion of the pouring kettle (7), the bottom of the pressure chamber is communicated with the inner pouring kettle (7), a sliding chute (8) is formed in one side, located at the feeding port, a valve (9) is movably connected into the sliding chute (8), and limit blocks (10) are fixedly mounted at two ends of the upper portion of the valve (9), the bottom of one side of the valve (9) close to the inside of the pressure chamber is fixedly provided with a first magnetic block (11), one side of the inside of the bottom of the feed inlet of the pouring kettle (7) positioned on the inner wall of the pressure chamber is fixedly provided with a second magnetic block (12), the inside of the pressure chamber of the pouring kettle (7) is movably connected with a pressure lever (13), an extrusion piston at the bottom of the pressure lever (13) is fixedly provided with a third magnetic block (14) with the gravity center position line coincident with the gravity center position line of the first magnetic block (11), the top of the pressure lever (13) is fixedly connected with a push plate (15), the middle part of the upper surface of the push plate (15) is fixedly provided with a hydraulic rod push rod (16), the lower surface of the push plate (15) positioned on the opposite end of the pressure lever (13) is fixedly provided with a connecting seat (17), the connecting seat (17) is movably connected with a first connecting rod (18), one end of the first connecting rod (18) is fixedly connected with a first rotating shaft (19), a second connecting rod (20) is movably sleeved on the first rotating shaft (19), a second rotating shaft (21) is fixedly installed in the middle of the second connecting rod (20), the second rotating shaft (21) is movably sleeved on a supporting seat at the top of the crucible (1), a third connecting rod (22) is movably connected to one end of the second connecting rod (20), a third rotating shaft (23) is fixedly installed at one end of the third connecting rod (22), the third rotating shaft (23) is movably sleeved inside a fourth connecting rod (25), a limiting sleeve ring (24) is fixedly installed in the middle of one side of an inlet (5) on the inner wall of the crucible (1), the fourth connecting rod (25) moves in the limiting sleeve ring (24) in a limiting mode, a press plug (26) is fixedly installed at the bottom of the fourth connecting rod (25), an impact box (27) is fixedly installed at one side of an outlet (4) on the upper surface of the shell (2), the bottom of the impact box (27) penetrates through the shell (2) and is communicated with a space formed by the lower surface of the shell (2) and the bottom part of the inner wall of the crucible (1).

2. A precision part die-casting apparatus as claimed in claim 1, wherein: the valve (9) is rectangular and the transverse length and the longitudinal length of the valve are larger than the diameter of the feeding hole of the pouring kettle (7).

3. A precision part die-casting apparatus as claimed in claim 1, wherein: the utility model discloses a liquid flow device, including shell (2), guide plate (3), export (4) and import (5), the incline direction of guide plate (3) is its inside liquid flow's direction, and wherein first guide plate (3) are installed in the bottom of shell (2) inner wall, and upper portion and shell (2) inner wall top contactless, and the top at shell (2) inner wall is installed in second guide plate (3), and the lower part does not contact with shell (2) inner wall bottom, and follow-up installation alternately goes on in proper order.

4. A precision part die-casting apparatus as claimed in claim 1, wherein: the magnetism of the second magnetic block (12) is the same as that of the third magnetic block (14), the magnetism of the first magnetic block (11) is opposite to that of the second magnetic block (12) and that of the third magnetic block (14), and the first magnetic block (11), the second magnetic block (12) and the third magnetic block (14) are made of alnico.

5. A precision part die-casting apparatus as claimed in claim 1, wherein: the upper surface of the piston part at the bottom of the pressure rod (13) is an inclined surface which inclines downwards from the center to the outside.

6. A precision part die-casting apparatus as claimed in claim 1, wherein: the central axis of the lantern ring part of the limiting lantern ring (24) is coincident with the central axis of the inlet (5), and the press plug (26) is in clearance fit with the inlet (5).

7. A precision part die-casting apparatus as claimed in claim 1, wherein: the opening of the feeding end of the impact box (27) is larger than the opening of the discharging end, and the bottom of the opening of the discharging end is in a downward concave arc shape.