CN114192752A - Novel screw type die-casting structure and die-casting method thereof - Google Patents
Novel screw type die-casting structure and die-casting method thereof Download PDFInfo
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- CN114192752A CN114192752A CN202111488429.6A CN202111488429A CN114192752A CN 114192752 A CN114192752 A CN 114192752A CN 202111488429 A CN202111488429 A CN 202111488429A CN 114192752 A CN114192752 A CN 114192752A
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- 238000004512 die casting Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims description 10
- 239000002184 metal Substances 0.000 claims abstract description 47
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000005485 electric heating Methods 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000392 somatic effect Effects 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2038—Heating, cooling or lubricating the injection unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/2069—Exerting after-pressure on the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/30—Accessories for supplying molten metal, e.g. in rations
Abstract
The invention discloses a novel screw type die-casting structure, which comprises a die connecting part, wherein a sprue is formed in the middle of the die connecting part, a die-casting sleeve body is fixed in the middle of the right side wall of the die connecting part, a conveying screw rod is inserted in the die-casting sleeve body, the left end of the die-casting sleeve body is fixed on the right side wall of the die connecting part, and the right end of the die-casting sleeve body is fixed on a vertical connecting plate of a rack; it can realize keeping warm to the die-casting cover body, guarantees the temperature of the molten metal in it, and simultaneously, it is back in getting into the mould through the runner with the molten metal, can hug closely through the left end inside wall with the lateral wall of conveying screw's conical head and the left end of toper cover somatic part mutually, covers the runner, realizes the pressurize effect, and its unnecessary molten metal can be in the die-casting cover body in addition and keep warm, the needs that convenient subsequent casting was used.
Description
The technical field is as follows:
the invention relates to the technical field of magnesium-aluminum alloy equipment manufacturing, in particular to a novel screw type die-casting structure and a die-casting method thereof.
Background art:
the die casting technology, namely the pressure casting technology, is a modern metal processing technology. Injecting liquid metal or alloy into a cavity of a mold at high speed and high pressure, and then maintaining pressure and crystallizing until the material is solidified and molded, wherein the molded product is a finished product or a semi-finished product required by the mechanical manufacturing industry. The pressure casting technology has extremely high production efficiency, excellent economic indexes and accurate die casting size, quickly becomes a supporting technology in the mechanical manufacturing industry, and is widely applied and developed in the production of parts.
Traditional cold chamber die casting machine pours into the molten metal into the plenum, again by the drift extrude the molten metal fast to the mould die cavity in, generally do not press from both sides the room and do not be equipped with heat preservation device, this can make the molten metal have certain temperature to lose in the plenum, make the molten metal temperature that gets into the mould die cavity can be less than preset's value, the molten metal in the plenum is once only filled completely simultaneously, unnecessary material can be filled into the expecting cake and waste. The pressure required for the punch is provided by a hydraulic cylinder and compressed nitrogen, and additional devices are required to provide the die-casting pressure.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides a novel screw type die-casting structure and a die-casting method thereof, which can realize heat preservation on a die-casting sleeve body and ensure the temperature of molten metal in the die-casting sleeve body, and meanwhile, after the molten metal enters a die through a pouring gate, the outer side wall of a conical head of a conveying screw can be clung to the inner side wall of the left end of the conical sleeve body part to cover the pouring gate so as to realize the pressure maintaining effect, and the redundant molten metal can be kept in the die-casting sleeve body for heat preservation, thereby being convenient for the subsequent casting use.
The scheme for solving the technical problems is as follows:
a novel screw type die-casting structure comprises a die connecting part, wherein a sprue is formed in the middle of the die connecting part, a die-casting sleeve body is fixed in the middle of the right side wall of the die connecting part, a conveying screw rod is inserted in the die-casting sleeve body, the left end of the die-casting sleeve body is fixed on the right side wall of the die connecting part, the right end of the die-casting sleeve body is fixed on a vertical connecting plate of a rack, a connecting shaft part of the right end of the conveying screw rod extends out of the vertical connecting plate and is connected with an output shaft of a speed reducing motor through a coupler, the speed reducing motor is fixed on the top surface of a horizontal moving plate, a transverse moving groove is formed in the middle of the top surface of a fixed horizontal plate of the rack, the horizontal moving plate is inserted and sleeved in the transverse moving groove, a pushing oil cylinder is fixed at the right part of the rack, and a pushing rod of the pushing oil cylinder pushes the horizontal moving plate to move;
the left end of the die-casting sleeve body is a conical sleeve body part with a small left end diameter and a large right end diameter, and a left end discharge hole of the conical sleeve body part is communicated with the pouring gate.
The left end middle part of the middle cylinder of the conveying screw rod is formed with a conical head, the conical head corresponds to the conical sleeve body part, and the outer side wall of the conical head is matched with the inner side wall of the conical sleeve body part.
And a distance of 0.2mm is formed between a screw blade of the conveying screw and the inner side wall of the die-casting sleeve body.
The diameter of a middle cylinder of the conveying screw is 1/3-1/4 of the diameter of the cross section of the inner side wall of the die-casting sleeve body.
The die-casting die sleeve is characterized in that a feed inlet is formed in the upper wall plate of the die-casting sleeve body, the feed inlet is positioned at the right part of the die-casting sleeve body, and the distance between the feed inlet and the right end of the die-casting sleeve body is 1/4-1/5 of the length of the whole die-casting sleeve body.
And a plurality of electric heating rings are fixed on the outer side walls of the left part, the middle part and the right part of the die-casting sleeve body.
The sprue is a tapered long through hole with a large left end diameter and a small right end diameter, and the diameter of a left end discharge port of the tapered sleeve body part is the same as that of the right end of the sprue.
The horizontal moving plate is characterized in that a lower support frame is arranged on the rack below the horizontal moving plate, a pushing through groove is formed in the middle of the bottom surface of the horizontal moving groove, a pushing oil cylinder is fixed on the lower support frame, a pushing block is fixed at the end of a push rod of the pushing oil cylinder, and the upper portion of the pushing block is inserted in the pushing through groove and fixed on the bottom surface of the horizontal moving plate.
And a transverse guide rod is fixed on the right side wall of the vertical connecting plate, a guide block is fixed on the top surface of the horizontal moving plate, and the transverse guide rod is inserted in a guide through hole of the guide block.
The die-casting method adopting the novel screw type die-casting structure comprises the following steps:
(1) all the electric heating rings are heated, so that the temperature in the die-casting sleeve body reaches a set value;
(2) the molten metal in the melting furnace flows into the die-casting sleeve body from the feeding hole, and meanwhile, the speed reduction motor operates to enable the conveying screw rod to rotate in the positive direction to feed the molten metal to the left, and in the conveying process, air in the die-casting sleeve body moves to the right along the gap to be discharged;
(3) when the cavity at the left end of the die-casting sleeve body is basically filled with the molten metal, the filling is finished;
(4) after filling, pushing a push rod of the oil cylinder to operate, pushing the conveying screw rod leftwards, enabling the outer side wall of the conical head of the conveying screw rod to be attached to the inner side wall of the left end of the conical sleeve body part, and enabling the left end of the conical head to be located in the pouring gate;
(5) the output shaft of the speed reducing motor runs in the reverse direction, so that the conveying screw rod runs in the reverse direction, redundant molten metal in the die-casting sleeve body is stored in the right part of the die-casting sleeve body, all the electric heating rings are heated, the temperature of the molten metal is kept, and the molten metal is ready for next die-casting and conveying;
(6) after the casting is taken out and the spraying is finished, after the die is closed, the oil cylinder is pushed to operate, so that the conveying screw rod moves rightwards and returns, and the steps are repeated to finish the subsequent die-casting work.
The invention has the following outstanding effects:
it can realize keeping warm to the die-casting cover body, guarantees the temperature of the molten metal in it, simultaneously, it is back in getting into the mould through the runner with the molten metal, can hug closely mutually through the left end inside wall with the lateral wall of conveying screw's conical head and the left end of toper cover somatic part, covers the runner, realizes the pressurize effect, need not extra equipment and provides the pressurize effect, and its unnecessary molten metal can be in the die-casting cover body in addition and keep warm, the needs that convenient subsequent casting was used.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a partial structural view of fig. 1 at the time of pressure holding.
The specific implementation mode is as follows:
embodiment, as shown in fig. 1 to 2, a novel screw type die casting structure includes a die connecting part 10, a sprue 11 is formed in the middle of the die connecting portion 10, a die-casting sleeve 20 is fixed in the middle of the right side wall of the die connecting portion 10, a conveying screw 21 is inserted in the die-casting sleeve 20, the left end of the die-casting sleeve 20 is fixed on the right side wall of the die connecting portion 10, the right end of the die-casting sleeve 20 is fixed on a vertical connecting plate 31 of the frame 30, a right connecting shaft portion 211 of the conveying screw 21 extends out of a rotating through hole of the vertical connecting plate 31 and is connected with an output shaft of a speed reducing motor 22 through a coupler, the speed reducing motor 22 is fixed on the top surface of a horizontal moving plate 23, a transverse moving groove 33 is formed in the middle of the top surface of a fixed horizontal plate 32 of the frame 30, the horizontal moving plate 23 is inserted in the transverse moving groove 33, a pushing oil cylinder 34 is fixed at the right part of the rack 30, and a push rod of the pushing oil cylinder 34 pushes the horizontal moving plate 23 to move;
the left end of the die-casting sleeve body 20 is a conical sleeve body part 25 with a small diameter at the left end and a large diameter at the right end, and a discharge port at the left end of the conical sleeve body part 25 is communicated with the sprue 11.
Further, a conical head 212 is formed in the middle of the left end of the middle cylinder of the conveying screw 21, the conical head 212 corresponds to the conical sleeve portion 25, and the outer side wall of the conical head 212 is matched with the inner side wall of the conical sleeve portion 25. When the conveying screw 21 is pushed to the left, the outer side wall of the conical head 212 is made to cling to the inner side wall of the left end of the conical sleeve part 25 and covers the pouring gate 11, so that molten metal can be prevented from entering the pouring gate 11, and the filling pressure can be locked to play a role in maintaining pressure.
Further, a distance 1 of 0.2mm is provided between the screw blade of the conveying screw 21 and the inner side wall of the die cast housing body 20. The interval 1 ensures that a large amount of liquid backflow due to pressure can not occur when the molten metal is filled, and when the molten metal enters, air in the molten metal moves rightwards to be discharged through the interval 1.
Further, the diameter of the middle cylinder of the conveying screw 21 is between 1/3 and 1/4 of the cross-sectional diameter of the inner side wall of the die cast sleeve body 20. The strength of the conveying screw 21 itself is ensured while ensuring a large space between the screw blades to contain the molten metal.
Furthermore, the die casting sleeve body 20 is formed with a feed inlet 26 on the upper wall plate, the feed inlet 26 is located at the right part of the die casting sleeve body 20, and the distance between the feed inlet 26 and the right end of the die casting sleeve body 20 is 1/4 to 1/5 of the length of the entire die casting sleeve body 20. It is ensured that the molten metal is prevented from being ejected from the feed port 26 when the feed screw 21 is reversely rotated and a small amount of the molten metal can be stored for the next filling without wasting the excess molten metal filled in the previous filling.
Furthermore, a plurality of electric heating rings 40 are fixed on the outer side walls of the left part, the middle part and the right part of the die-casting sleeve body 20.
Further, the gate 11 is a long tapered through hole with a larger diameter at the left end and a smaller diameter at the right end, and the diameter of the discharge port at the left end of the tapered sleeve portion 25 is the same as the diameter of the right end of the gate 11.
Further, a lower support frame 35 is arranged on the frame 30 below the horizontal moving plate 23, a pushing through groove 36 is formed in the middle of the bottom surface of the horizontal moving groove 33, a pushing cylinder 34 is fixed on the lower support frame 35, a pushing block 341 is fixed at the end of a push rod of the pushing cylinder 34, and the upper portion of the pushing block 341 is inserted in the pushing through groove 36 and fixed on the bottom surface of the horizontal moving plate 23. The wear-resistant layer 6 is fixed to the bottom surface of the lateral moving groove 33, and the top surface of the wear-resistant layer 6 is pressed against the bottom surface of the horizontal moving plate 23.
Further, a transverse guide rod 2 is fixed on the right side wall of the vertical connecting plate 31, a guide block 3 is fixed on the top surface of the horizontal moving plate 23, and the transverse guide rod 2 is inserted and sleeved in a guide through hole of the guide block 3.
Still the cover is equipped with thermal-insulated protective sleeve 50 on the outside of the die-casting cover body 20, and the right-hand member of thermal-insulated protective sleeve 50 is fixed on the left lateral wall of vertical connecting plate 31, and all electric heat rings 40 are in between the die-casting cover body 20 and thermal-insulated protective sleeve 50, and the upper portion shaping of thermal-insulated protective sleeve 50 has the drain sleeve of downwardly extending, and the bottom mounting of drain sleeve leads on the upper portion lateral wall of the die-casting cover body 20 and makes the drain sleeve communicate with each other with feed inlet 26, and the top of drain sleeve communicates with each other and aligns with the through-hole on the upper portion wallboard of thermal-insulated protective sleeve 50. The heat insulating protective sleeve 50 has a through-hole for threading so that all the electric connection wires of the electrothermal ring 40 can be extended from the through-hole for threading.
The vertical connecting plate 31 is provided with a connecting through hole, a lubricating sleeve is fixed on the inner side wall of the connecting through hole, the right end connecting shaft part 211 of the conveying screw 21 is inserted in the lubricating sleeve, the outer side wall of the conveying screw is tightly attached to the inner side wall of the lubricating sleeve, and the speed of the conveying screw 21 is slow when the conveying screw runs.
When the lubricating sleeve is used, air discharged by moving the distance 1 to the right can be discharged from a gap between the lubricating sleeve and the inner side wall of the connecting through hole.
The die-casting method adopting the novel screw type die-casting structure comprises the following steps:
1. all the electric heating rings 40 are heated, so that the temperature in the die-casting sleeve body 20 reaches a set value;
2. molten metal in the melting furnace flows into the die-casting sleeve body 20 from the feeding hole 26, and meanwhile, the speed reducing motor 22 operates to enable the conveying screw 21 to rotate in the positive direction to feed the molten metal to the left, and air in the die-casting sleeve body 20 moves to the right along the gap 1 to be discharged in the conveying process; the phenomenon of air entrainment caused by the fact that a large amount of air enters the die cavity is reduced.
In the filling stage, the molten metal is filled in the whole die cavity in a very short time, and the control of the time has very high influence on the quality of the casting according to the formula:
t-filling time(s) TnTemperature of the in-gate molten metal (. degree. C.)
TgThe liquidus temperature (. degree. C.) T of the molten metalmMold temperature (. degree. C.)
b-average wall thickness of casting (mm)
The filling time can be calculated from the casting, typically between 20-40 ms.
3. When the molten metal substantially fills the cavity at the left end of the die-casting jacket body 20, the filling is complete;
4. after filling, the push rod of the push oil cylinder 34 retracts, so that the conveying screw 21 is pushed leftwards, the outer side wall of the conical head 212 of the conveying screw 21 is tightly attached to the inner side wall of the left end of the conical sleeve part 25 and covers the feeding end of the pouring gate 11, and the left end of the conical head 212 is positioned in the pouring gate 11; at this stage, the filling pressure is the key for ensuring that the molten metal fills the whole mold cavity, the overlarge pressure is a load on the mold clamping force of the mold, and the undersize is easy to cause insufficient filling. According to the formula
Fy-injection force (kN) PgPressure of the working fluid within the injection cylinder (MPa)
D-diameter of injection cylinder (cm) K-pressure loss coefficient
PbPressure ratio ((MPa) A-pressure chamber cross-sectional area (cm)2)
The pressure value required by the casting can be calculated, the forward rotation of the conveying screw 21 is controlled by the speed reducing motor 22, meanwhile, the conveying screw 21 is controlled to be pushed leftwards by pushing the oil cylinder 34 to provide the pressure value required by filling, and the accuracy of the pressure can be further ensured by inputting two pressure values. The outer side wall of the conical head 212 is closely attached to the inner side wall of the left end of the conical sleeve body part 25, so that the metal liquid is pressurized and locked at the pressure value, and the metal liquid in the die cavity is uniformly solidified in a high-pressure state.
5. The output shaft of the speed reducing motor 22 runs in the reverse direction, so that the conveying screw 21 runs in the reverse direction, redundant molten metal in the die-casting sleeve body 20 is stored in the right part of the die-casting sleeve body 20, all the electric heating rings 40 are heated, the temperature of the molten metal is kept, and the molten metal is ready for the next die-casting conveying;
6. after the casting is taken out and the spraying is finished, after the die is closed, the casting is pushed to operate by a push rod of the pushing oil cylinder 34, so that the conveying screw 21 moves rightwards and returns, and the steps are repeated to finish the subsequent die-casting work.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (10)
1. The utility model provides a novel screw die-casting structure, includes mould connecting portion (10), its characterized in that: a pouring gate (11) is formed in the middle of the die connecting portion (10), a die-casting sleeve body (20) is fixed in the middle of the right side wall of the die connecting portion (10), a conveying screw rod (21) is sleeved in the die-casting sleeve body (20), the left end of the die-casting sleeve body (20) is fixed on the right side wall of the die connecting portion (10), the right end of the die-casting sleeve body (20) is fixed on a vertical connecting plate (31) of the rack (30), a right end connecting shaft portion (211) of the conveying screw rod (21) extends out of the vertical connecting plate (31) and is connected with an output shaft of a speed reducing motor (22) through a coupler, the speed reducing motor (22) is fixed on the top surface of a horizontal moving plate (23), a transverse moving groove (33) is formed in the middle of the top surface of a fixed horizontal plate (32) of the rack (30), the horizontal moving plate (23) is sleeved in the transverse moving groove (33), a pushing oil cylinder (34) is fixed at the right portion of the rack (30), a push rod of the push oil cylinder (34) pushes the horizontal moving plate (23) to move;
the left end of the die-casting sleeve body (20) is a conical sleeve body part (25) with a small diameter at the left end and a large diameter at the right end, and a discharge port at the left end of the conical sleeve body part (25) is communicated with the pouring gate (11).
2. The novel screw type die casting structure of claim 1, wherein: a conical head (212) is formed in the middle of the left end of the middle cylinder of the conveying screw (21), the conical head (212) corresponds to the conical sleeve body (25), and the outer side wall of the conical head (212) is matched with the inner side wall of the conical sleeve body (25).
3. The novel screw type die casting structure of claim 1, wherein: and a distance (1) of 0.2mm is reserved between the screw blade of the conveying screw (21) and the inner side wall of the die-casting sleeve body (20).
4. The novel screw type die casting structure of claim 1, wherein: the diameter of a middle cylinder of the conveying screw (21) is between 1/3 and 1/4 of the diameter of the cross section of the inner side wall of the die-casting sleeve body (20).
5. The novel screw type die casting structure of claim 1, wherein: the die-casting die sleeve is characterized in that a feed inlet (26) is formed in the upper wall plate of the die-casting sleeve body (20), the feed inlet (26) is positioned at the right part of the die-casting sleeve body (20), and the distance between the feed inlet and the right end of the die-casting sleeve body (20) is 1/4-1/5 of the length of the whole die-casting sleeve body (20).
6. The novel screw type die casting structure of claim 1, wherein: and a plurality of electric heating rings (40) are fixed on the outer side walls of the left part, the middle part and the right part of the die-casting sleeve body (20).
7. The novel screw type die casting structure of claim 1, wherein: the sprue (11) is a conical long through hole with a large diameter at the left end and a small diameter at the right end, and the diameter of a discharge port at the left end of the conical sleeve body part (25) is the same as that of the right end of the sprue (11).
8. The novel screw type die casting structure of claim 1, wherein: the horizontal moving plate is characterized in that a lower support frame (35) is arranged on the rack (30) below the horizontal moving plate (23), a pushing through groove (36) is formed in the middle of the bottom surface of the horizontal moving groove (33), a pushing oil cylinder (34) is fixed on the lower support frame (35), a pushing block (341) is fixed at the end of a push rod of the pushing oil cylinder (34), and the upper portion of the pushing block (341) is inserted in the pushing through groove (36) and fixed on the bottom surface of the horizontal moving plate (23).
9. The novel screw type die casting structure of claim 1, wherein: a transverse guide rod (2) is fixed on the right side wall of the vertical connecting plate (31), a guide block (3) is fixed on the top surface of the horizontal moving plate (23), and the transverse guide rod (2) is inserted in a guide through hole of the guide block (3).
10. A die casting method using the novel screw type die casting structure of claims 1 to 7, characterized in that: it comprises the following steps:
(1) all the electric heating rings (40) are heated, so that the temperature in the die-casting sleeve body (20) reaches a set value;
(2) molten metal in the melting furnace flows into the die-casting sleeve body (20) from the feeding hole (26), and meanwhile, the speed reducing motor (22) operates to enable the conveying screw rod (21) to rotate in the positive direction to feed the molten metal to the left, and air in the die-casting sleeve body (20) moves to the right along the gap (1) to be discharged in the conveying process;
(3) when the molten metal basically fills the cavity at the left end of the die-casting sleeve body (20), the filling is finished;
(4) after filling, pushing a push rod of the oil cylinder (34) to operate, pushing the conveying screw rod (21) leftwards, enabling the outer side wall of a conical head (212) of the conveying screw rod (21) to be attached to the inner side wall of the left end of the conical sleeve body part (25), and enabling the left end of the conical head (212) to be located in the pouring gate (11);
(5) the output shaft of the speed reducing motor (22) runs in the reverse direction, so that the conveying screw (21) runs in the reverse direction, redundant molten metal in the die-casting sleeve body (20) is stored in the right part of the die-casting sleeve body (20), all the electric heating rings (40) are heated, the temperature of the molten metal is maintained, and the molten metal is ready for next die-casting conveying;
(6) after the casting is taken out and the spraying is finished, after the die is closed, the oil cylinder (34) is pushed to operate, so that the conveying screw rod (21) moves rightwards to return, and the steps are repeated to finish the subsequent die casting.
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| CN202111488429.6A CN114192752A (en) | 2021-12-08 | 2021-12-08 | Novel screw type die-casting structure and die-casting method thereof |
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| CN202111488429.6A CN114192752A (en) | 2021-12-08 | 2021-12-08 | Novel screw type die-casting structure and die-casting method thereof |
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| CN214814664U (en) * | 2021-03-25 | 2021-11-23 | 惠州市鑫冠金属有限公司 | Heating device for auto-parts mould |
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Application publication date: 20220318 |