Automobile part die-casting all-dimensional cooling die system

Abstract

The invention relates to the technical field of automobile part die-casting, in particular to an automobile part die-casting all-dimensional cooling die system which comprises an upper die and a lower die. A first groove is formed in the lower portion of the upper die, a second groove is formed in the upper portion of the lower die, the first groove and the second groove are both of an annular structure, after the upper die and the lower die are assembled, the first groove and the second groove jointly form a surrounding cavity, the surrounding cavity is arranged on the periphery of the die-casting cavity in a surrounding mode, and an injection pipe is vertically arranged in the first groove. And an inserting pipe matched with the injection pipe in an inserting mode is vertically arranged in the second groove, when molten metal is injected into the die-casting cavity, heated cooling liquid is introduced into the injection pipe and the inserting pipe, and when the molten metal in the die-casting cavity is injected, cooled cooling liquid is introduced into the injection pipe and the inserting pipe. According to the die-casting die, the quality of automobile parts after die casting can be guaranteed, and the cooling effect of the die-casting cavity after die casting can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of die casting of automotive parts, and specifically relates to an all-round cooling die system for die casting of automotive parts. Background Art

[0002] In the prior art, the internal structure of some dies is complex and there are flat and narrow places, which are vulnerable to the influence of the annular temperature of the die, resulting in premature solidification of some liquid molten alloy during the injection process, and then unable to fill the entire inner cavity of the die, resulting in poor precision of the die-cast automotive parts.

[0003] Chinese Patent Publication No. CN117161349B discloses an all-round cooling die system for die casting of automotive parts, including a die casting die, which is composed of a lower die casting die body and an upper die casting die body that are detachably and hermetically buckled with each other. Inner die casting die support assemblies are installed inside both the lower die casting die body and the upper die casting die body. The inner die casting die support assembly is used to adaptively support die casting die liners of various shapes for producing automotive parts; the inner die casting die support assembly is composed of a die casting die shell and an inner support member fixed inside the die casting die shell; the system also includes a cooling box, which is connected to the die casting die, and the cooling box is used to provide hot air and coolant for the die casting die shell; hot air is introduced into the die casting die shell by the cooling box, and the hot air fills the space around the inner support member to keep the die casting die liner warm before introducing the molten alloy, to reduce the injection filling speed of the molten alloy in the die casting die liner, and to ensure the discharge of gas inside the die casting die liner.

[0004] The above solution keeps the inside of the mold cavity warm by introducing hot air. However, hot air has fluidity, and the flowing hot air is likely to block the molten metal outside the flat and narrow places. Moreover, the temperature of the hot air is limited and the temperature of the hot air gradually decreases. When the molten metal enters the flat and narrow places, the hot air cannot continuously keep the flat and narrow places warm. At the same time, the vertically arranged die usually includes an upper die and a lower die, and it is usually impossible to set a cooling system and a heat preservation system at the mold closing place of the upper die and the lower die. Thus, the temperature at the mold closing place of the upper die and the lower die is more likely to have poor heat preservation when injecting molten metal compared with other positions, and the temperature reduction effect is also poor when cooling is required. Summary of the Invention

[0005] To address the above problems, a full - range cooling die system for die - casting of automotive parts is provided. By opening a first groove on the upper die and arranging an injection pipe in the first groove, and opening a second groove on the lower die and arranging an insertion pipe in the second groove, after the upper die and the lower die are closed to form a die - casting cavity, the first groove and the second groove jointly form a surrounding cavity. The surrounding cavity surrounds the periphery of the die - casting cavity at the connection position of the upper die and the lower die. When injecting molten metal into the die - casting cavity, by injecting heated coolant into the injection pipe, the temperature in the surrounding cavity rises. Compared with traditional die systems, it avoids the premature solidification of the molten metal in the die - casting cavity near the connection position of the upper die and the lower die due to excessive cooling. At the same time, compared with the method of pre - heating the die - casting cavity with hot air, it also avoids the void phenomenon caused by the influence of air flow. When the die - casting cavity is filled with molten metal, the cooled coolant is discharged from the cooling pipeline of the upper die into the cooling pipeline of the lower die through the injection pipe and the insertion pipe, thus realizing the full - range cooling of the molten metal in the die - casting cavity, improving the cooling effect of the molten metal in the die - casting cavity, and enabling the present invention to not only ensure the quality of automotive parts after die - casting but also improve the cooling effect of the die - casting cavity after die - casting is completed.

[0006] To solve the problems of the prior art, the present invention provides a full - range cooling die system for die - casting of automotive parts, including an upper die and a lower die. After the upper die and the lower die are closed, a die - casting cavity is formed; a first groove is opened at the lower part of the upper die, and a second groove is opened at the upper part of the lower die. Both the first groove and the second groove are annular structures. After the upper die and the lower die are closed, the first groove and the second groove jointly form a surrounding cavity, and the surrounding cavity is arranged around the periphery of the die - casting cavity. An injection pipe is vertically arranged in the first groove, and an insertion pipe that is inserted and matched with the injection pipe is vertically arranged in the second groove. When the die - casting cavity is injected with molten metal, heated coolant is introduced into the injection pipe and the insertion pipe. When the injection of molten metal in the die - casting cavity is completed, cooled coolant is introduced into the injection pipe and the insertion pipe.

[0007] Preferably, the coolant is high - temperature silicone oil.

[0008] Preferably, a heating plate is fixedly arranged on the side wall of the injection pipe, and an electromagnetic heating coil for heating the heating plate is sleeved outside the injection pipe.

[0009] Preferably, an air inlet groove and an air outlet groove communicating with the outside are respectively arranged at the bottom of the second groove, valves are respectively arranged at the ends of the air inlet groove and the air outlet groove, and an air pump for blowing outside air into the second groove is arranged on one side of the air inlet groove.

[0010] Preferably, a first plugging ball capable of plugging the lower end of the injection pipe is arranged in the injection pipe, and a first spring for providing pressure to the first plugging ball is arranged above the first plugging ball. Before the injection pipe is inserted into the insertion pipe, the first plugging ball plugs the lower end of the injection pipe.

[0011] Preferably, a cooling pipeline is arranged in the lower mold, a communication groove communicating with both the cooling pipeline and the insertion pipe is arranged on the side wall of the insertion pipe, a second plugging ball capable of plugging the connection between the communication groove and the insertion pipe is arranged in the communication groove, and a second spring for providing pressure to the second plugging ball is arranged on one side of the second plugging ball.

[0012] Preferably, a jacking rod is vertically arranged on the lower side of the insertion pipe. When the upper mold and the lower mold are closed, the jacking rod jacks the first plugging ball away from the lower end of the injection pipe, and the first spring is compressed.

[0013] Preferably, a lifting block is slidably arranged in the insertion pipe in the vertical direction, and a third spring is vertically arranged between the lifting block and the bottom of the insertion pipe. When the third spring is in a non-compressed state, the upper end surface of the lifting block is coplanar with the upper end surface of the insertion pipe.

[0014] Preferably, a limiting block is vertically and fixedly arranged at the bottom of the insertion pipe. The jacking rod penetrates through the lifting block in the vertical direction and is slidably matched with the lifting block. When the limiting block is disengaged from contact with the jacking rod, the upper end of the jacking rod is disengaged from contact with the first plugging ball.

[0015] Preferably, a sinking groove is vertically opened at the bottom of the second groove, a sealing plate is slidably arranged in the second groove in the vertical direction, and a fourth spring connecting the two is vertically arranged between the sealing plate and the bottom of the sinking groove. When the fourth spring is in a non-compressed state, the upper end surface of the sealing plate is coplanar with the upper end surface of the lower mold.

[0016] The beneficial effects of the present invention compared with the prior art are: 1. In the present invention, a first groove is formed on the upper die and an injection pipe is arranged in the first groove, and a second groove is formed on the lower die and an insertion pipe is arranged in the second groove. After the upper die and the lower die are closed to form a die casting cavity, the first groove and the second groove jointly form an enclosure cavity, which surrounds the periphery of the die casting cavity at the connection position of the upper die and the lower die. When injecting molten metal into the die casting cavity, the temperature in the enclosure cavity is increased by injecting heated coolant into the injection pipe. Compared with the traditional die system, it avoids the premature solidification of the molten metal in the die casting cavity near the connection position of the upper die and the lower die due to excessive cooling rate. At the same time, compared with the method of preheating the die casting cavity by hot air, it also avoids the void phenomenon caused by the influence of air flow. When the die casting cavity is filled with molten metal, the cooled coolant is discharged from the cooling pipeline of the upper die into the cooling pipeline of the lower die through the injection pipe and the insertion pipe, thereby realizing the all-round cooling of the molten metal in the die casting cavity, improving the cooling effect of the molten metal in the die casting cavity, and enabling the present invention to ensure the quality of the automotive parts after die casting and improve the cooling effect of the die casting cavity after die casting.

[0017] 2. An electromagnetic heating coil is sleeved around the injection pipe, and a heating plate is fixedly arranged on the injection pipe. After the upper die and the lower die are closed, the electromagnetic heating coil is started synchronously, and the electromagnetic heating coil heats the heating plate. When the coolant passes through the injection pipe, it can be reheated by the heating plate, improving the heat preservation effect of the enclosure cavity. At the same time, an air inlet groove and an air outlet groove are arranged on the second groove, and valve bodies are respectively arranged on the air inlet groove and the air outlet groove. When injecting molten metal into the die casting cavity, the valve bodies are in the closed state. When the injection of molten metal into the die casting cavity is completed, the valve bodies are opened, and at the same time, an air pump discharges external air from the air inlet groove into the enclosure cavity, and the hot air in the enclosure cavity is discharged from the air outlet groove, thereby realizing the rapid cooling of the enclosure cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional schematic diagram of a die system for all-round cooling of automotive parts die casting according to the present invention.

[0019] Figure 2 is a three-dimensional schematic diagram of the upper die of a die system for all-round cooling of automotive parts die casting according to the present invention.

[0020] Figure 3 is a three-dimensional schematic diagram of the lower die of a die system for all-round cooling of automotive parts die casting according to the present invention.

[0021] Figure 4 is a side view of a die system for all-round cooling of automotive parts die casting according to the present invention.

[0022] Figure 5It is a sectional view of the A-A position in a Figure 4 die-casting all-round cooling mold system for automotive parts of the present invention.

[0023] Figure 6 It is a Figure 5 partial enlarged view of the B position in a die-casting all-round cooling mold system for automotive parts of the present invention.

[0024] Figure 7 It is a Figure 5 partial enlarged view of the C position in a die-casting all-round cooling mold system for automotive parts of the present invention.

[0025] Figure 8 It is a sectional perspective view of a die-casting all-round cooling mold system for automotive parts of the present invention Figure 1 .

[0026] Figure 9 It is a Figure 8 partial enlarged view of the D position in a die-casting all-round cooling mold system for automotive parts of the present invention.

[0027] Figure 10 It is a sectional perspective view of a die-casting all-round cooling mold system for automotive parts of the present invention Figure 2 .

[0028] Figure 11 It is a sectional perspective view of the lower mold of a die-casting all-round cooling mold system for automotive parts of the present invention.

[0029] Figure 12 It is a Figure 11 partial enlarged view of the E position in a die-casting all-round cooling mold system for automotive parts of the present invention.

[0030] The reference numerals in the figure are: 1. Upper mold; 11. First groove; 12. Injection pipe; 121. Electromagnetic heating coil; 122. Heating plate; 123. First plugging ball; 124. First spring; 125. Bracket; 2. Lower mold; 21. Second groove; 211. Sinking groove; 212. Fourth spring; 213. Sealing plate; 22. Insertion pipe; 221. Jacking rod; 222. Lifting block; 223. Third spring; 224. Limiting block; 23. Air inlet groove; 24. Air outlet groove; 25. Valve body; 26. Air pump; 27. Connecting groove; 271. Second plugging ball; 272. Second spring; 3. Die-casting cavity; 4. Enclosing cavity; 5. Cooling pipeline. Detailed implementation manners

[0031] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0032] Reference Figures 1 - 9 : A full - range cooling die system for die - casting of automotive parts, including an upper die 1 and a lower die 2. After the upper die 1 and the lower die 2 are closed, a die - casting cavity 3 is formed. A first groove 11 is opened at the lower part of the upper die 1, and a second groove 21 is opened at the upper part of the lower die 2. Both the first groove 11 and the second groove 21 are annular structures. After the upper die 1 and the lower die 2 are closed, the first groove 11 and the second groove 21 together form an enclosing cavity 4. The enclosing cavity 4 is arranged around the periphery of the die - casting cavity 3. An injection pipe 12 is vertically arranged in the first groove 11, and an insertion pipe 22 that is inserted and matched with the injection pipe 12 is vertically arranged in the second groove 21. When molten metal is injected into the die - casting cavity 3, heated coolant is introduced into the injection pipe 12 and the insertion pipe 22. When the injection of molten metal in the die - casting cavity 3 is completed, cooled coolant is introduced into the injection pipe 12 and the insertion pipe 22.

[0033] During the process of die - casting automotive parts, traditional die systems mainly adopt a vertical arrangement type, that is, including an upper die 1 and a lower die 2. During die - casting, after the upper die 1 and the lower die 2 are closed, a die - casting cavity 3 is formed, and molten metal is injected into the die - casting cavity 3. When the molten metal completely fills the die - casting cavity 3, cooling pipelines 5 are respectively arranged on the upper die 1 and the lower die 2. A flowing coolant is arranged in the cooling pipelines 5, and the coolant cools the molten metal in the die - casting cavity 3, and finally the automotive parts in the die - casting cavity 3 are formed. However, during the die - casting process, the temperature of the coolant remaining in the cooling pipelines 5 is usually relatively low, and the molten metal just injected into the die - casting cavity 3 will be quickly cooled. If there are flat and narrow positions in the die - casting cavity 3, the molten metal is likely to cool and solidify when passing through. In order to overcome the situation that the temperature in the die - casting cavity 3 is relatively low when injecting molten metal, in the prior art, hot air is blown into the die - casting cavity 3 to achieve the pre - heating effect of the die - casting cavity 3 and reduce the cooling effect produced by the coolant in the cooling pipelines 5 on the die - casting cavity 3. However, hot air has fluidity, and in order to ensure the heat - preservation effect on the die - casting cavity 3, hot air also needs to be blown into the die - casting cavity 3 while injecting molten metal. Although the die - casting cavity 3 can be pre - heated to a certain extent in the above - mentioned manner, hot air has fluidity, and the molten metal is in a liquid state. The flowing hot air will stir up the molten metal, which may lead to the generation of voids when die - casting is completed. If hot air is not used to pre - heat the die - casting cavity 3, but heating devices are respectively arranged on the upper die 1 and the lower die 2, although the upper die 1 and the lower die 2 can be heated, the temperature loss at the closing position of the upper die 1 and the lower die 2 is relatively fast. If the flat and narrow places in the die - casting cavity 3 are close to the closing position of the upper die 1 and the lower die 2, the molten metal will solidify in advance again.

[0034] In order to avoid the above situation, the existing mold system is redesigned so that after the die-casting cavity 3 is formed, a surrounding cavity 4 that can surround the die-casting cavity 3 is formed between the upper mold 1 and the lower mold 2. The surrounding cavity 4 surrounds the die-casting cavity 3, thereby achieving the heat preservation effect at the connection between the upper mold 1 and the lower mold 2. At the same time, by changing the temperature of the coolant flowing through the injection pipe 12 and the insertion pipe 22, it not only makes it difficult for the molten metal to cool and solidify during injection, but also enables the molten metal to quickly cool down after filling the die-casting cavity 3, ensuring both the die-casting quality and improving the die-casting speed. The specific structure and working process of the all-round cooling mold system of the present invention are as follows: Cooling pipelines 5 are provided on both the upper mold 1 and the lower mold 2, and a coolant is provided in the cooling pipelines 5. The injection pipe 12 arranged in the first groove 11 is communicated with the cooling pipeline 5 in the upper mold 1, and the insertion pipe 22 arranged in the second groove 21 is communicated with the cooling pipeline 5 in the lower mold 2. When the upper mold 1 and the lower mold 2 are closed, the first groove 11 on the upper mold 1 and the second groove 21 on the lower mold 2 are mutually closed to form a surrounding cavity 4. The surrounding cavity 4 is of a ring structure and surrounds the die-casting cavity 3. At this time, the cooling pipeline 5 in the upper mold 1 conveys the heated coolant into the injection pipe 12 and discharges it into the cooling pipeline 5 of the lower mold 2 through the insertion pipe 22 that is inserted and matched with the injection pipe 12. At this time, the two sets of cooling pipelines 5 respectively arranged in the upper mold 1 and the lower mold 2 can preheat the upper mold 1 and the lower mold 2 respectively. At the same time, due to the arrangement of the injection pipe 12 and the insertion pipe 22, when the heated coolant passes through the injection pipe 12 and the insertion pipe 22, the coolant in the high-temperature state heats the air in the surrounding cavity 4, causing the air in the surrounding cavity 4 to continuously rise. Compared with the traditional mold system, the die-casting cavity 3 near the connection between the upper mold 1 and the lower mold 2 is insulated by the surrounding cavity 4, avoiding the premature solidification of the molten metal when it is injected into the die-casting cavity 3. After the molten metal is completely injected into the die-casting cavity 3, the cooled coolant is injected into the cooling pipeline 5 in the upper mold 1, enters the cooling pipeline 5 in the lower mold 2 after passing through the injection pipe 12 and the insertion pipe 22, and the cooled coolant quickly cools down the surrounding cavity 4, so that the surrounding cavity 4 can synchronously cool down the die-casting cavity 3 along with the cooling pipeline 5, improving the cooling effect on the die-casting cavity 3.

[0035] By forming a first groove 11 on the upper die 1 and arranging an injection pipe 12 in the first groove 11, and forming a second groove 21 on the lower die 2 and arranging an insertion pipe 22 in the second groove 21, after the upper die 1 and the lower die 2 are closed to form a die-casting cavity 3, the first groove 11 and the second groove 21 jointly form an enclosing cavity 4. The enclosing cavity 4 encloses the die-casting cavity 3 around the connection position of the upper die 1 and the lower die 2. When injecting molten metal into the die-casting cavity 3, by injecting heated coolant into the injection pipe 12, the temperature in the enclosing cavity 4 rises. Compared with the traditional die system, it avoids the premature solidification of the molten metal in the die-casting cavity 3 near the connection position of the upper die 1 and the lower die 2 due to excessive cooling. At the same time, compared with the method of preheating the die-casting cavity 3 by hot air, it also avoids the void phenomenon caused by the influence of air flow. When the die-casting cavity 3 is filled with molten metal, the cooled coolant is discharged from the cooling pipeline 5 of the upper die 1 into the cooling pipeline 5 of the lower die 2 through the injection pipe 12 and the insertion pipe 22, thereby realizing the all-round cooling of the molten metal in the die-casting cavity 3, improving the cooling effect of the molten metal in the die-casting cavity 3, and enabling the present invention to not only ensure the quality of the automotive parts after die-casting but also improve the cooling effect of the die-casting cavity 3 after die-casting.

[0036] Refer to Figures 1 - 12 : The coolant is high-temperature silicone oil.

[0037] The working range of the high-temperature silicone oil is -40 - 260 degrees. When it is necessary to keep the die-casting cavity 3 warm, the coolant is first heated to 260 degrees. When cooling the die-casting cavity 3, the cooled high-temperature silicone oil is injected into the cooling pipeline 5 of the upper die 1. It should be noted that when cooling the die-casting cavity 3, the high-temperature silicone oil for cooling needs to be injected into the cooling pipeline 5 in a gradually decreasing temperature manner, otherwise it will cause damage to the upper die 1 and the lower die 2. The device for specifically controlling the temperature rise and fall of the high-temperature silicone oil is the prior art and will not be elaborated here.

[0038] Refer to Figure 9 : A heating plate 122 is fixedly arranged on the side wall of the injection pipe 12, and an electromagnetic heating coil 121 for heating the heating plate 122 is sleeved outside the injection pipe 12.

[0039] After the heated coolant is injected from the cooling pipeline 5 of the upper die 1, the temperature of the coolant tends to gradually decrease during the flow. In order to ensure the heat preservation at the enclosing cavity 4, an electromagnetic heating coil 121 is sleeved outside the injection pipe 12, and a heating plate 122 is fixedly arranged on the injection pipe 12. After the upper die 1 and the lower die 2 are closed, the electromagnetic heating coil 121 is started synchronously. The electromagnetic heating coil 121 heats the heating plate 122, and the coolant can be reheated by the heating plate 122 when passing through the injection pipe 12, improving the heat preservation effect of the enclosing cavity 4.

[0040] Refer to Figure 10 and Figure 11 : An air inlet groove 23 and an air outlet groove 24 communicating with the outside are respectively arranged at the bottom of the second groove 21. Valve bodies 25 are respectively arranged at the ends of the air inlet groove 23 and the air outlet groove 24. An air pump 26 for blowing outside air into the second groove 21 is arranged on one side of the air inlet groove 23.

[0041] When starting to inject molten metal into the die casting cavity 3, the two valve bodies 25 arranged on the air inlet groove 23 and the air outlet groove 24 are both in a closed state. At this time, the surrounding cavity 4 is in a sealed state, ensuring that the coolant after heating can quickly heat the air in the surrounding cavity 4 when passing through the surrounding cavity 4. At the same time, an electromagnetic heating coil 121 for heating the heating block arranged on the injection pipe 12 is also arranged around the injection pipe 12, further improving the heating speed of the surrounding cavity 4. However, after the die casting cavity 3 is filled with molten metal, although the cooling pipeline 5 in the upper die 1 discharges the cooled coolant into the injection pipe 12, since the surrounding cavity 4 is in a sealed state at this time, the cooling effect of the coolant on the surrounding cavity 4 is slow. In order to improve the cooling effect of the surrounding cavity 4, an air inlet groove 23 and an air outlet groove 24 communicating with the outside are respectively arranged at the bottom of the second groove 21, the valve bodies 25 arranged on the air inlet groove 23 and the air outlet groove 24 are opened, and the air inlet groove 23 is inflated through the air pump 26, so that the outside air rushes into the surrounding cavity 4, and the air in the surrounding cavity 4 is discharged through the air outlet groove 24, thus improving the cooling speed of the surrounding cavity 4.

[0042] Refer to Figure 6 : A first plugging ball 123 capable of plugging the lower end of the injection pipe 12 is arranged in the injection pipe 12. A first spring 124 for providing pressure to the first plugging ball 123 is arranged above the first plugging ball 123. Before the injection pipe 12 is inserted into the insertion pipe 22, the first plugging ball 123 plugs the lower end of the injection pipe 12.

[0043] Refer to Figure 5 and Figure 6 : A cooling pipeline 5 is arranged in the lower die 2. A communication groove 27 communicating with both the cooling pipeline 5 and the insertion pipe 22 is arranged on the side wall of the insertion pipe 22. A second plugging ball 271 capable of plugging the connection part between the communication groove 27 and the insertion pipe 22 is arranged in the communication groove 27. A second spring 272 for providing pressure to the second plugging ball 271 is arranged on one side of the second plugging ball 271.

[0044] Refer to Figure 6 and Figure 7 : A jacking rod 221 is vertically arranged below the insertion pipe 22. When the upper die 1 and the lower die 2 are closed, the jacking rod 221 jacks the first plugging ball 123 away from the lower end of the injection pipe 12, and the first spring 124 is compressed.

[0045] Refer to Figure 6 and Figure 7 : A lifting block 222 is slidably arranged vertically in the insertion pipe 22. A third spring 223 is vertically arranged between the lifting block 222 and the bottom of the insertion pipe 22. When the third spring 223 is in a non-compressed state, the upper end surface of the lifting block 222 is coplanar with the upper end surface of the insertion pipe 22.

[0046] Both ends of the third spring 223 are fixedly connected to the lifting block 222 and the bottom of the insertion pipe 22 respectively. When the upper die 1 and the lower die 2 are not closed, the injection pipe 12 is not inserted into the insertion pipe 22. At this time, the third spring 223 is in a non-compressed state, and the upper end surface of the lifting block 222 is coplanar with the upper end surface of the insertion pipe 22, avoiding dust from the outside falling into the insertion pipe 22 when the upper die 1 and the lower die 2 are in a separated state.

[0047] Refer to Figure 7 : A limit block 224 is vertically and fixedly arranged at the bottom of the insertion pipe 22. The jacking rod 221 passes vertically through the lifting block 222 and is slidably matched with the lifting block 222. When the limit block 224 is disengaged from the jacking rod 221, the upper end of the jacking rod 221 is disengaged from the first plugging ball 123.

[0048] During the process of the upper mold 1 and the lower mold 2 being closed, the injection pipe 12 first inserts into the insertion pipe 22. The injection pipe 12 presses the lifting block 222, causing the third spring 223 to gradually compress. At this time, the first blocking ball 123 does not contact the lifting rod 221. When the lower limiting rod of the lifting rod 221 comes into contact, the upper mold 1 and the lower mold 2 are about to complete the closing. At this time, the injection pipe 12 continues to descend with the upper mold 1. Under the action of the limiting block 224, the lifting rod 221 pushes the first blocking ball 123. The lifting rod 221 and the lifting block 222 slide relative to each other. The injection pipe 12 pushes the lifting block 222 to continue descending. After the upper mold 1 and the lower mold 2 are closed, the coolant in the injection pipe 12 can flow into the communication groove 27 through the gap between the first blocking ball 123 and the end of the injection pipe 12, and push up the second blocking ball 271 blocking the end of the communication groove 27, thus realizing the circulation of the coolant. After die casting is completed, the upper mold 1 and the lower mold 2 gradually separate. The upper mold 1 drives the injection pipe 12 to rise. The lifting block 222 synchronously rises with the injection pipe 12 under the action of the third spring 223. When the lifting rod 221 disengages from the limiting block 224, the first blocking ball 123 blocks the lower end of the injection pipe 12. At this time, the injection pipe 12 has not yet slipped out of the insertion pipe 22, avoiding the situation where when the injection pipe 12 slips out of the insertion pipe 22, the first blocking ball 123 fails to block the lower end of the injection pipe 12 in time, resulting in the coolant dripping from the lower end of the injection pipe 12. If the lifting rod 221 is directly fixedly arranged on the lifting block 222, when the injection pipe 12 descends, the first blocking ball 123 will first contact the lifting rod 221, causing the sealing of the first blocking ball 123 to the injection pipe 12 to fail, and further resulting in the leakage of the coolant in the injection pipe 12 before the injection pipe 12 is connected to the insertion pipe 22.

[0049] Refer to Figure 5 and Figure 12 : A sinking groove 211 is vertically opened at the bottom of the second groove 21. A sealing plate 213 is slidably arranged vertically in the second groove 21. A fourth spring 212 connecting the two is vertically arranged between the bottom of the sealing plate 213 and the bottom of the sinking groove 211. When the fourth spring 212 is in a non-compressed state, the upper end surface of the sealing plate 213 is coplanar with the upper end surface of the lower mold 2.

[0050] A bracket 125 is arranged outside the electromagnetic heating coil 121. The bracket 125 synchronously rises and falls with the injection pipe 12. Before the upper mold 1 and the lower mold 2 are closed, the bracket 125 descending synchronously with the injection pipe 12 presses the sealing plate 213, causing the fourth spring 212 to compress. The sealing plate 213 is provided with a plurality of through holes. After the upper mold 1 and the lower mold 2 are closed, the surrounding cavity 4 is located above the sealing plate 213. The air inlet groove 23 and the air outlet groove 24 can communicate with the surrounding cavity 4 through the through holes, avoiding a large amount of dust accumulating in the second groove 21.

[0051] Working principle: When the upper die 1 and the lower die 2 are closed, the first groove 11 on the upper die 1 and the second groove 21 on the lower die 2 are closed with each other to form an enclosed cavity 4. The enclosed cavity 4 is of an annular structure and surrounds the die casting cavity 3. At this time, the cooling pipeline 5 in the upper die 1 conveys the heated cooling liquid to the injection pipe 12, and discharges it into the cooling pipeline 5 of the lower die 2 through the insertion pipe 22 that is inserted and matched with the injection pipe 12. At this time, the two sets of cooling pipelines 5 respectively arranged in the upper die 1 and the lower die 2 can preheat the upper die 1 and the lower die 2 respectively. At the same time, due to the setting of the injection pipe 12 and the insertion pipe 22, when the heated cooling liquid passes through the injection pipe 12 and the insertion pipe 22, the cooling liquid in the high-temperature state heats the air in the enclosed cavity 4, making the air in the enclosed cavity 4 continuously rise. Compared with the traditional die system, the die casting cavity 3 near the connection of the upper die 1 and the lower die 2 is insulated by the enclosed cavity 4, avoiding the premature condensation of the molten metal when it is injected into the die casting cavity 3. After the molten metal is completely injected into the die casting cavity 3, the cooled cooling liquid is injected into the cooling pipeline 5 in the upper die 1, enters the cooling pipeline 5 in the lower die 2 after passing through the injection pipe 12 and the insertion pipe 22, and the cooled cooling liquid rapidly cools the enclosed cavity 4, so that the enclosed cavity 4 can synchronously cool the die casting cavity 3 along with the cooling pipeline 5, improving the cooling effect on the die casting cavity 3.

[0052] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An all-round cooling die system for die-casting of automotive parts, comprising an upper die (1) and a lower die (2). When the upper die (1) and the lower die (2) are closed, a die-casting cavity (3) is formed. It is characterized in that A first groove (11) is formed in the lower part of the upper die (1), and a second groove (21) is formed in the upper part of the lower die (2). Both the first groove (11) and the second groove (21) are annular structures. After the upper die (1) and the lower die (2) are closed, the first groove (11) and the second groove (21) together form an enclosure cavity (4). The enclosure cavity (4) is arranged around the periphery of the die-casting cavity (3). An injection pipe (12) is vertically arranged in the first groove (11), and an insertion pipe (22) that is inserted and matched with the injection pipe (12) is vertically arranged in the second groove (21). When molten metal is injected into the die-casting cavity (3), heated coolant is introduced into the injection pipe (12) and the insertion pipe (22). When the injection of molten metal in the die-casting cavity (3) is completed, cooled coolant is introduced into the injection pipe (12) and the insertion pipe (22).

2. The all-round cooling die system for die-casting of automotive parts according to claim 1, wherein, The coolant is high-temperature silicone oil.

3. The all-round cooling die system for die-casting of automotive parts according to claim 1, characterized in that, A heating plate (122) is fixedly arranged on the side wall of the injection pipe (12), and an electromagnetic heating coil (121) for heating the heating plate (122) is sleeved outside the injection pipe (12).

4. The all-round cooling die system for die-casting of automotive parts according to claim 1, characterized in that, An air inlet groove (23) and an air outlet groove (24) communicating with the outside are respectively arranged at the bottom of the second groove (21). Valve bodies (25) are respectively arranged at the ends of the air inlet groove (23) and the air outlet groove (24). An air pump (26) for blowing outside air into the second groove (21) is arranged on one side of the air inlet groove (23).

5. The all-round cooling die system for die casting of automotive parts according to claim 1, characterized in that A first blocking ball (123) capable of blocking the lower end of the injection pipe (12) is arranged in the injection pipe (12). A first spring (124) for providing pressure to the first blocking ball (123) is arranged above the first blocking ball (123). Before the injection pipe (12) is inserted into the insertion pipe (22), the first blocking ball (123) blocks the lower end of the injection pipe (12).

6. The all-round cooling die system for die casting of automotive parts according to claim 1, wherein, A cooling pipeline (5) is arranged in the lower die (2). A communication groove (27) communicating with both the cooling pipeline (5) and the insertion pipe (22) is arranged on the side wall of the insertion pipe (22). A second blocking ball (271) capable of blocking the connection between the communication groove (27) and the insertion pipe (22) is arranged in the communication groove (27). A second spring (272) for providing pressure to the second blocking ball (271) is arranged on one side of the second blocking ball (271).

7. A full - range cooling die system for die - casting of automotive parts according to claim 5, characterized in that, A lifting rod (221) is vertically arranged below the insertion pipe (22). When the upper die (1) and the lower die (2) are closed, the lifting rod (221) pushes the first blocking ball (123) away from the lower end of the injection pipe (12), and the first spring (124) is compressed.

8. A full - range cooling die system for die - casting of automotive parts according to claim 7, characterized in that, A lifting block (222) is slidably arranged in the insertion pipe (22) in the vertical direction. A third spring (223) is vertically arranged between the lifting block (222) and the bottom of the insertion pipe (22). When the third spring (223) is in a non-compressed state, the upper end surface of the lifting block (222) is coplanar with the upper end surface of the insertion pipe (22).

9. The all-round cooling die system for die-casting of automotive parts according to claim 8, characterized in that, A limiting block (224) is vertically and fixedly arranged at the bottom of the insertion pipe (22). The jacking rod (221) penetrates through the lifting block (222) in the vertical direction and is in sliding fit with the lifting block (222). When the limiting block (224) is disengaged from the jacking rod (221), the upper end of the jacking rod (221) is disengaged from the first sealing ball (123).

10. A full - range cooling die system for die - casting of automotive parts according to claim 1, characterized in that, A sinking groove (211) is vertically formed at the bottom of the second groove (21). A sealing plate (213) is slidably arranged in the second groove (21) in the vertical direction. A fourth spring (212) connecting the two is vertically arranged between the sealing plate (213) and the bottom of the sinking groove (211). When the fourth spring (212) is in a non-compressed state, the upper end surface of the sealing plate (213) is coplanar with the upper end surface of the lower die (2).

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