Semi-solid magnesium alloy charging barrel for cold chamber die-casting machine and cold chamber die-casting machine

Abstract

The utility model belongs to the technical field of charging barrels for metal forming, and particularly relates to a semi-solid magnesium alloy charging barrel for a cold chamber die-casting machine and the cold chamber die-casting machine. The utility model provides a semi-solid magnesium alloy charging barrel for a cold chamber die casting machine, which comprises a machine barrel unit, a nozzle unit integrally formed with the machine barrel unit and arranged on a die assembly head plate, and a heating unit arranged on the machine barrel unit, the cylinder body of the machine cylinder unit is provided with an extraction valve and a feeding hole for realizing a vacuumizing process and feeding slurry, so that the influence of air leakage of a mold on the slurry is avoided through a simpler material cylinder structure, the difficulty of generating a high-vacuum-degree space in the material cylinder is reduced, leakage points of the material cylinder are further reduced, and the production efficiency is improved. The number of product air holes is reduced, and the production quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of barrels for metal forming, in particular to a semi-solid magnesium alloy barrel for a cold chamber die casting machine and the cold chamber die casting machine. Background Art

[0002] Cold chamber die-casting machines in the prior art generally use conventional barrels for making magnesium alloy products. The barrel of conventional cold chamber die-casting machines has poor front-to-back sealing, large leakage of magnesium alloy melt, unstable material volume, large amount of magnesium oxide residue, and air mixed in the produced products, resulting in low product qualification rate. Therefore, a vacuum process is often used to reduce the amount of air in the barrel and mold. However, due to the different filling time points, the required vacuum time for the mold and the barrel is different, and the existing straight-through barrel requires vacuuming at two positions at the same time, which has high technical requirements.

[0003] A Chinese utility model patent with patent announcement number CN209239006U and announcement date 2019.8.13 discloses a two-stage vacuum high-pressure die-casting system, which is integrated with a cold chamber die-casting machine, a two-stage vacuum unit and a charging furnace. The molten metal inlet of the barrel of the cold chamber die-casting machine is packaged together with the sealing area of ​​the nozzle of the charging furnace, and the nozzle of the charging furnace is set as the injection sleeve of the cold chamber die-casting machine; the two-stage vacuum system includes a first vacuum pump unit and a second vacuum pump unit, the first vacuum pump is connected to the packaging mechanism of the barrel of the cold chamber die-casting machine and the quantitative nozzle of the quantitative furnace, and the second vacuum pump and the vacuum tank are connected to the vacuum valve of the die-casting mold.

[0004] The two-stage vacuum high-pressure die-casting system in this Chinese utility model patent has the following general usage and advantages: during the molten metal feeding stage, the first vacuum pump unit is started to pre-extract the gas stored in the spray gun; after the pre-injection stage begins, the mold cavity and the injection barrel become confined spaces, and the second vacuum pump unit will be activated to extract the remaining gas in the mold cavity, thereby achieving a high vacuum level in a short time during high-speed injection; compared with the traditional vacuum die-casting process, the two-stage vacuum high-pressure die-casting system provides a cost-effective solution for reducing porosity defects in the aluminum die-casting process, and can achieve a high vacuum level in a short time during high-speed injection.

[0005] However, during actual use, the two-stage vacuum high-pressure die-casting system still has at least the following shortcomings. In other words, these are the technical problems to be solved by the present invention: Although the two-stage vacuum high-pressure die-casting system avoids the simultaneous vacuuming of the mold and the barrel by setting up two vacuum units, thereby avoiding the influence of air leakage of the mold on the vacuum state of the barrel and reducing the amount of air included in the slurry in the barrel, there are still multiple connection points in the system and the structure is complex. Therefore, there are many leakage points, which easily cause the vacuum degree to fail to meet the requirements.

[0006] Therefore, in summary, there is an urgent need for a semi-solid magnesium alloy barrel with a simple structure, stronger airtightness and the ability to achieve high vacuum to solve such problems. Utility Model Content

[0007] The utility model provides a semi-solid magnesium alloy barrel for a cold chamber die-casting machine, which comprises a barrel unit, a nozzle unit integrally formed with the barrel unit and arranged on a clamping head plate, and a heating unit on the barrel unit. An exhaust valve and a feed port are arranged on the barrel body of the barrel unit to realize a vacuum process and access slurry, so that: the utility model avoids the influence of mold air leakage on the slurry through a relatively simple barrel structure, reduces the difficulty of generating a high vacuum space inside the barrel, further reduces the leakage points of the barrel, reduces the number of air holes in the product, and improves the production quality.

[0008] The technical solution adopted by the utility model to solve the above-mentioned problem is: a semi-solid magnesium alloy barrel for a cold chamber die-casting machine, including a barrel unit, a nozzle unit arranged on a die head plate and integrally formed with the head of the barrel unit, and a heating unit arranged on the barrel unit; the barrel unit includes a barrel body, an exhaust valve port arranged on the barrel body and connected to the interior of the barrel body, and a feed port arranged on one side of the exhaust valve port and used to access the slurry.

[0009] A further preferred technical solution is that the heating unit includes a plurality of sections of heaters for heat preservation arranged on the circumference of the cylinder, and a heating ring arranged on the nozzle unit.

[0010] A further preferred technical solution is that the nozzle unit includes a first nozzle segment arranged at the front end of the barrel, and a second nozzle segment arranged at the front end of the first nozzle segment, and the inner diameter of the second nozzle segment is smaller than the inner diameter of the first nozzle segment.

[0011] A further preferred technical solution is that the heating ring is arranged on the second nozzle segment.

[0012] A further preferred technical solution is that a nozzle opening is formed at the front end of the second nozzle segment, and a pull-off reverse angle is arranged around the nozzle opening.

[0013] A further preferred technical solution is that the nozzle opening is interference fit with the feed opening in the die head plate.

[0014] A further preferred technical solution is that the nozzle unit further comprises a head plate fixing block which is arranged on the first nozzle segment and connected to the clamping head plate.

[0015] A further preferred technical solution is that the barrel unit further includes a connecting portion which is arranged on the barrel body and connected to the head plate fixing block.

[0016] A further preferred technical solution is that the connecting portion includes a convex ring arranged around the circumference of the cylinder body, and a fixing flange arranged on the convex ring and connected to the head plate fixing block.

[0017] Another object of the present invention is to provide a cold chamber die-casting machine for semi-solid magnesium alloy, comprising any one of the semi-solid magnesium alloy barrels for cold chamber die-casting machines described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the utility model;

[0020] Figure 3 This is the first cross-sectional view of the structure of the utility model;

[0021] Figure 4 This is the second cross-sectional view of the structure of the utility model;

[0022] Figure 5 It is an overall top view of the utility model.

[0023] In the figure, the meanings of the reference numerals are as follows:

[0024] Barrel unit 1, nozzle unit 2, heating unit 3;

[0025] Cylinder 11, air extraction valve port 12, feed port 13, connecting portion 14, first nozzle section 21, second nozzle section 22, pull-off contra angle 23, head plate fixing block 24, heater 31, heating coil 32;

[0026] The convex ring 141 , the fixing flange 142 , and the nozzle opening 221 . DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. The following description is only a preferred embodiment of the present invention and does not limit the scope of the present invention.

[0028] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0029] As attached Figure 1-5As shown, a semi-solid magnesium alloy barrel for a cold chamber die-casting machine includes a barrel unit 1, a nozzle unit 2 arranged on a clamping head plate a and integrally formed with the head of the barrel unit 1, and a heating unit 3 arranged on the barrel unit 1; the barrel unit 1 includes a barrel body 11, an exhaust valve port 12 arranged on the barrel body 11 and connected to the interior of the barrel body 11, and a feed port 13 arranged on one side of the exhaust valve port 12 and used to access the slurry.

[0030] In this embodiment, the general method of using the semi-solid magnesium alloy barrel for the cold chamber die casting machine is as follows:

[0031] The nozzle unit 2 is integrally formed and arranged at the head of the barrel unit 1, and is fixed to the barrel fixing block of the clamping head plate a by means of screws or the like. The screw connection enables the barrel to be detachably mounted on the clamping head plate a, which is convenient for the maintenance of the internal structure; the integrally formed nozzle unit 2 avoids the structural sealing deficiency caused by the connection between the nozzle and the barrel unit 1. Compared with the straight-through barrel, the nozzle-type arrangement effectively reduces the influence of the air leakage point inside the mold on the high vacuum space inside the barrel; an exhaust valve port 12 for connecting the vacuum equipment and a valve port 12 for connecting the cold chamber pressure The feed inlet 13 connected to the slurry preparation barrel of the casting machine does not need to set an exhaust point at the head mold of the barrel 11 at the same time. The overall structure only requires an exhaust valve port 12 on the tail end to generate a high vacuum space inside the barrel 11, further reducing the leakage points of the barrel and improving the slurry density; the heating unit 3 is arranged on the barrel unit 1 to achieve insulation and heating of the slurry in the barrel 11. The barrel 11 is made of high-temperature resistant alloy steel, which maintains high mechanical properties and hardness at 700°C. The components do not react with the magnesium alloy melt and will not catalyze the oxidation of the magnesium alloy. It is suitable for storing semi-solid magnesium alloy slurry.

[0032] The heating unit 3 includes a plurality of heaters 31 disposed on the circumference of the barrel 11 for heat preservation, and a heating ring 32 disposed on the nozzle unit 2 .

[0033] In this embodiment, the heating unit 3 is functionally divided into two types. One is a heater 31 arranged on the side of the barrel 11 to maintain the semi-solid state of the slurry in the barrel 11. The other is a heating coil 32 arranged on the nozzle unit 2. When the heating coil 32 is not working, the nozzle-type barrel will cause the slurry to naturally solidify at the nozzle position, forming a high-solid phase ratio cold plug to block the nozzle mouth, naturally isolating the connection between the mold and the barrel, so that the barrel 11 forms a closed space. The heating coil 32 is used to work after the barrel 11 completes the vacuum process, and the melted cold plug cooperates to complete the injection operation. The heating coil 32 and the heater 31 are controlled separately and do not affect each other. Both can use electromagnetic induction / resistance wire heating coils.

[0034] The nozzle unit 2 includes a first nozzle segment 21 disposed at the front end of the barrel 11 , and a second nozzle segment 22 disposed at the front end of the first nozzle segment 21 . The inner diameter of the second nozzle segment 22 is smaller than the inner diameter of the first nozzle segment 21 .

[0035] In this embodiment, the nozzle unit 2 includes two sections arranged at the front end of the barrel 11, which are the first nozzle section 21 and the second nozzle section 22 axially forward from the connection at the head of the barrel 11. The second nozzle section 22 is connected to the clamping head plate a. The inner diameter of the second nozzle section 22 is smaller than the inner diameter of the first nozzle section 21, so that the injection channel formed inside the nozzle unit 2 becomes smaller from the inside to the outside, which is more conducive to the formation of a cold plug at the nozzle mouth and avoids the risk of leakage when the barrel completes the injection work into the mold.

[0036] The heating coil 32 is disposed on the second nozzle segment 22 .

[0037] In this embodiment, the second nozzle section 22 is connected to the clamping head plate a, and the heating coil 32 is used to heat and melt the cold plug at the nozzle of the second nozzle section 22 to complete the injection after the vacuum state, or to cut off the power so that the naturally formed cold plug blocks the nozzle mouth to facilitate the cooperation with the vacuum valve mouth 12 to exhaust air to produce a high vacuum space in the barrel.

[0038] A nozzle opening 221 is formed at the front end of the second nozzle section 22 , and a pull-off concave angle 23 is arranged around the nozzle opening 221 .

[0039] In this embodiment, the tearing reverse angle 23 set at the nozzle opening 221 forms a slope around the nozzle opening 221, which is used to accelerate the product prepared by the slurry to fall off from the barrel, effectively avoid residue, and significantly reduce raw material loss.

[0040] The nozzle opening 221 is interference fit with the feed opening in the die head plate a.

[0041] In this embodiment, the nozzle opening 221 is set as a thermal expansion opening. The nozzle opening 221 is inserted into the mold of the clamping head plate a and is pressed and matched with the mold feed port, which improves the structural stability while reducing the leakage of magnesium alloy slurry during the production process, avoids the deterioration of the slurry caused by air inhalation, and greatly reduces the waste of some raw materials in the flow channel.

[0042] The nozzle unit 2 further includes a head plate fixing block 24 which is arranged on the first nozzle segment 21 and connected to the die clamping head plate a.

[0043] In this embodiment, the barrel unit 1 is installed and fixed to the head plate fixing block from the non-mold side, that is, fixed to the first nozzle segment 21 arranged at the front end of the barrel unit 1. The detachable installation method facilitates the removal of the barrel from the clamping head plate a, thereby realizing the maintenance of the nozzle unit 2, the heating unit 3 and other structures.

[0044] The barrel unit 1 further includes a connecting portion 14 disposed on the barrel body 11 and connected to the head plate fixing block 24 .

[0045] In this embodiment, the connecting portion 14 is used to achieve connection with the head plate fixing block 24 on the clamping head plate a. The connecting portion 14 matches the head plate fixing block 24 in shape so that it can be fixedly connected by bolts or the like after pre-positioning.

[0046] The connecting portion 14 includes a convex ring 141 disposed around the circumference of the cylinder 11 , and a fixing flange 142 disposed on the convex ring 141 and connected to the head plate fixing block 24 .

[0047] In this embodiment, the convex ring 141 is naturally formed on the circumferential side of the cylinder 11, and is snap-fitted with the groove formed in the head plate fixing block 24. A fixing flange 142 is provided on one axial side of the convex ring 141. The cylinder 11 is rotated so that the screw hole docking position of the fixing flange 142 corresponds to the position of the positioning hole on the head plate fixing block 24, and the bolts are tightened to complete the docking and fixation of the connecting part 14 and the clamping head plate a.

[0048] A semi-solid magnesium alloy barrel for a cold chamber die-casting machine provided in this embodiment has the following advantages over the prior art: first, the barrel is an integrated nozzle-type barrel, and the integrated design of the nozzle and the barrel improves the structural sealing of the barrel itself. The nozzle-type barrel avoids direct passage between the barrel and the mold, reducing the influence of the mold leakage point on the slurry in the barrel; second, a heating ring is arranged at the nozzle so that the nozzle can melt / form a cold plug, further improving the airtightness in the barrel before feeding; a high vacuum space can be generated in the barrel by only arranging an exhaust valve near the feed port at the rear end of the barrel, which effectively avoids the situation in the prior art where an exhaust valve needs to be arranged near the connection mold and on the barrel, further reducing possible leakage points in the barrel and improving the slurry purity and product quality.

[0049] In other embodiments, a cold chamber die-casting machine for semi-solid magnesium alloy is provided, which comprises any one of the above-mentioned semi-solid magnesium alloy barrels for cold chamber die-casting machines.

[0050] The above is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the utility model.

Claims

1. A semi-solid magnesium alloy barrel for a cold chamber die casting machine, comprising a barrel unit (1), characterized in that: It also includes a nozzle unit (2) arranged on the clamping head plate (a) and integrally formed with the head of the barrel unit (1), and a heating unit (3) arranged on the barrel unit (1); the barrel unit (1) includes a barrel (11), an exhaust valve port (12) arranged on the barrel (11) and connected to the inside of the barrel (11), and a feed port (13) arranged on one side of the exhaust valve port (12) and used to receive slurry.

2. A semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 1, characterized in that: The heating unit (3) comprises a plurality of sections of heaters (31) arranged on the circumference of the barrel (11) for heat preservation, and a heating ring (32) arranged on the nozzle unit (2).

3. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 2, characterized in that: The nozzle unit (2) comprises a first nozzle segment (21) arranged at the front end of the barrel (11), and a second nozzle segment (22) arranged at the front end of the first nozzle segment (21), wherein the inner diameter of the second nozzle segment (22) is smaller than the inner diameter of the first nozzle segment (21).

4. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 3, characterized in that: The heating coil (32) is arranged on the second nozzle segment (22).

5. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 4, characterized in that: A nozzle opening (221) is formed at the front end of the second nozzle section (22), and a pull-off reverse angle (23) is arranged around the nozzle opening (221).

6. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 5, characterized in that: The nozzle opening (221) is interference fit with the feed opening in the die head plate (a).

7. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 4, characterized in that: The nozzle unit (2) further comprises a head plate fixing block (24) which is arranged on the first nozzle segment (21) and connected to the die clamping head plate (a).

8. The semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 7, characterized in that: The barrel unit (1) further comprises a connecting portion (14) which is arranged on the barrel body (11) and connected to the head plate fixing block (24).

9. A semi-solid magnesium alloy barrel for a cold chamber die casting machine according to claim 8, characterized in that: The connecting portion (14) comprises a convex ring (141) arranged around the circumference of the cylinder (11), and a fixing flange (142) arranged on the convex ring (141) and connected to the head plate fixing block (24).

10. A cold chamber die casting machine for semi-solid magnesium alloy, characterized in that: A semi-solid magnesium alloy barrel for a cold chamber die casting machine comprising the method described in any one of claims 1 to 9.

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