High-thermal-conductivity die-casting mold sprue bush with cooling jacket easy to disassemble and assemble and assembling method

Abstract

The invention discloses a high-thermal-conductivity die-casting mold sprue bush with a cooling jacket easy to disassemble and assemble and an assembling method, the high-thermal-conductivity die-casting mold sprue bush comprises a sprue bush body provided with a runner on the inner side and the cooling jacket internally provided with a water channel, a sleeving surface is arranged on the outer side of the sprue bush body, a sleeving hole penetrating through the cooling jacket is formed in the inner side of the cooling jacket, and the sleeving hole is connected with the sleeving surface in a sleeving mode; more than two branch connecting grooves recessed in the sleeving hole and the sleeving surface are formed in the sleeving hole and the sleeving surface, main connecting grooves recessed in the sleeving hole and the sleeving surface are formed between the branch connecting grooves and the sleeving hole and / or between the branch connecting grooves and the sleeving surface, and all the branch connecting grooves are communicated with one another through the main connecting grooves; the main connecting grooves and the branch connecting grooves are filled with hot melting heat conductors. The sprue bush has the advantages of being easy to disassemble and assemble, good in heat conductivity and stable, the response speed of sprue bush temperature control can be increased, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of die casting molds, and in particular to a high thermal conductivity die casting mold gate sleeve with an easily disassembled cooling sleeve and an assembling method. Background Art

[0002] Die casting is a metal pressure casting process, which is characterized by the use of injection molding machines and molds to apply high pressure to the molten metal. It is widely used in the molding of aluminum, zinc, magnesium and other alloys. In particular, aluminum alloys are widely used in the automotive, aviation, electrical and other industries due to their price, processability and density.

[0003] The first part of the die-casting mold that comes into contact with the die-casting molten metal is the sprue bushing. Taking the aluminum alloy die-casting process as an example, the aluminum alloy molten metal temperature is usually 630-730°C, the injection pressure is 30-70MPa, and the filling speed is about 0.5-50m / s. It can be seen that the sprue bushing needs to withstand the alternating impact of high temperature and high pressure, which seriously affects the service life of the sprue bushing.

[0004] In order to ensure good efficiency, the production cycle is generally within 90 seconds, so the injection and cooling time is generally not more than 25s. In order to improve efficiency while avoiding parts explosion, aluminum liquid splashing, and damage to equipment and personnel, the gate sleeve needs to be cooled.

[0005] Since the service life of the sprue sleeve is limited, the cost of processing the cooling water channel on the sprue sleeve is relatively high. Therefore, the sprue sleeve and the cooling sleeve are generally separated. For example, the public document CN213002496U adopts the method of adding a cooling sleeve outside the sprue sleeve for cooling, and also explains the use of clearance fit between the sprue sleeve and the cooling sleeve. Although the public document does not disclose the reason for the clearance fit, according to industry experience, since the sprue sleeve needs to withstand the alternating impact of high temperature and high pressure, interference fit can easily damage the cooling sleeve. However, the clearance fit will seriously affect the heat conduction effect, delay the temperature control response speed, and affect the production cycle.

[0006] At the same time, due to the harsh die-casting environment, the gate sleeve and the cooling sleeve are difficult to separate after use due to factors such as rust and dirt, which affects the reuse of the cooling sleeve, seriously affects the maintenance time, and even causes the material to be scrapped.

[0007] Therefore, there is an urgent need to design a high thermal conductivity die casting mold gate sleeve and an assembly method that are easy to disassemble and assemble while having good thermal conductivity. Summary of the invention

[0008] In order to overcome the deficiencies of the prior art, the technical solution adopted by the present invention is as follows:

[0009] A high-thermal-conductivity die-casting mold sprue sleeve with an easily detachable cooling sleeve, comprising a sprue sleeve (10) with a flow channel (11) arranged on the inner side and a cooling sleeve (20) with a water channel (21) arranged on the inner side, characterized in that: a sleeve joint surface (12) is arranged on the outer side of the sprue sleeve (10), a sleeve joint hole (22) penetrating the cooling sleeve (20) is arranged on the inner side of the cooling sleeve (20), and the sleeve joint hole (22) is sleeved with the sleeve joint surface (12);

[0010] The sleeve hole (22) and the sleeve surface (12) are provided with more than two branch connection grooves (14) recessed in the sleeve hole (22) and the sleeve surface (12); a main connection groove (13) recessed in the sleeve hole (22) and the sleeve surface (12) is provided between the branch connection groove (14) and the sleeve hole (22) and / or between the branch connection groove (14) and the sleeve surface (12); the main connection groove (13) enables all the branch connection grooves (14) to communicate with each other;

[0011] The main connection groove (13) and the branch connection groove (14) are filled with a hot-melt heat conductor.

[0012] Preferably, the sleeve hole (22), the sleeve surface (12), the branch connection groove (14) and the main connection groove (13) are all rotational or spiral structures centered on the axis of the flow channel (11), and the main connection groove (13) does not pass through both ends of the sleeve hole (22) or the sleeve surface (12).

[0013] Preferably, one end of the main connection groove (13) is provided with a balancing hole (16) for connecting the main connection groove (13) with the outside.

[0014] Preferably, the other end of the main connection groove (13) opposite to the balance hole (16) is provided with an exhaust hole (15) for connecting the main connection groove (13) with the outside.

[0015] Preferably, the cross-sectional contour lines of the branch connection grooves (14) are tangent and continuous.

[0016] Preferably, the hot-melt heat conductor is an aluminum-copper alloy having a melting point not lower than 680 degrees Celsius.

[0017] Preferably, the mass percentage of aluminum in the aluminum-copper alloy is 40-60%, the mass percentage of copper is 40-60%, and the melting point of the aluminum-copper alloy is 760-800 degrees Celsius.

[0018] The assembly method of this embodiment includes the following steps:

[0019] S1, placing a hot melt heat conductor into a crucible and heating it until it melts;

[0020] S2, the inlet and outlet of the water channel (21) of the cooling jacket (20) are sealed and placed in a hot-melt heat conductor, and the main connecting groove (13) and / or the branch connecting groove (14) are immersed in the melt;

[0021] S3, inserting the sleeve surface (12) of the sprue sleeve (10) into the sleeve hole (22) of the cooling sleeve (20);

[0022] S4, taking out the combination of the sprue sleeve (10) and the cooling sleeve (20), cleaning the external hot-melt heat conductor after cooling, and completing the assembly.

[0023] Preferably, before the step S2, a release agent is applied to the area outside the main connection groove (13) and the branch connection groove (14).

[0024] Preferably, before the step S2, the surfaces of the main connecting groove (13) and the branch connecting groove (14) are infiltrated with aluminum.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. By setting more than two branch connection grooves and filling them with hot-melt heat conductors, the heat exchange area between the gate sleeve and the cooling sleeve can be increased while ensuring that they are firmly and tightly connected, thereby reducing thermal resistance and improving the response speed of temperature control and production efficiency.

[0027] 2. Use hot-melt thermal conductor filling, which can be quickly disassembled and assembled by heating.

[0028] 3. A main connection groove is provided to ensure that all branch connection grooves are connected to the main connection groove, so that the filled hot-melt heat conductor becomes a whole, while ensuring the filling effect, improving the stability of the connection between the gate sleeve and the cooling sleeve.

[0029] 4. Aluminum-copper alloy is used as a hot melt heat conductor, which has good thermal conductivity and suitable melting point. In aluminum alloy die-casting factories, aluminum-copper alloy with the required melting point can be easily obtained by adding copper to commonly used die-casting raw materials such as ADC12. In addition, the use of aluminum-copper alloy filling can avoid corrosion, and has good stability while having good thermal conductivity.

[0030] 5. The melting point of the aluminum-copper alloy is set to 760-800 degrees Celsius, which can be applied to the die-casting process of all common aluminum alloys at present, and the melting point is not higher than 800 degrees Celsius. When using the patented method for assembly, the aluminum-copper alloy can be better prevented from diffusing and penetrating on the surface of the gate sleeve and the cooling sleeve. After assembly, the external aluminum-copper alloy is easy to clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an axonometric view (half section) of the present invention;

[0032] Figure 2 A bottom view of the present invention;

[0033] Figure 3 for Figure 2 AA section view;

[0034] Figure 4 for Figure 3 A partial enlarged view of B.

[0035] Among them: a gate sleeve 10, a runner 11, a sleeve surface 12, a main connecting groove 13, a branch connecting groove 14, an exhaust hole 15, a balance hole 16, a cooling sleeve 20, a water channel 21, and a sleeve hole 22. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present invention are provided in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0040] like Figures 1 to 4 As shown, a high thermal conductivity die casting mold sprue sleeve with an easily detachable cooling sleeve comprises a sprue sleeve 10 with a flow channel 11 disposed inside and a cooling sleeve 20 with a water channel 21 disposed inside, a sleeve surface 12 disposed outside the sprue sleeve 10, a sleeve hole 22 penetrating the cooling sleeve 20 disposed inside the cooling sleeve 20, and the sleeve hole 22 is sleeved with the sleeve surface 12;

[0041] The sleeve hole 22 and the sleeve surface 12 are provided with more than two branch connection grooves 14 recessed in the attached surface, and a main connection groove 13 recessed in the sleeve hole 22 and the sleeve surface 12 is provided between the branch connection groove 14 and the sleeve hole 22 and / or the branch connection groove 14 and the sleeve surface 12, and the main connection groove 13 connects all the branch connection grooves 14 to each other;

[0042] The main connection groove 13 and the branch connection groove 14 are filled with hot-melt heat conductors.

[0043] In this embodiment, by providing more than two branch connection grooves 14 and filling them with hot-melt heat conductors, it is possible to increase the heat exchange area between the gate sleeve 10 and the cooling sleeve 20 while ensuring that they are firmly and tightly connected, thereby reducing thermal resistance and improving the response time of temperature control and improving production efficiency.

[0044] The main connection groove 13 is provided to ensure that all branch connection grooves 14 are connected to the main connection groove 13, so that the filled hot-melt heat conductor becomes a whole, while ensuring the filling effect, improving the stability of the connection between the gate sleeve 10 and the cooling sleeve 20.

[0045] The sleeve connection with the sleeve hole 22 and the sleeve surface 12 having a clearance fit is filled with a hot-melt heat conductor, and can be quickly disassembled and assembled by heating.

[0046] Furthermore, in order to facilitate processing and disassembly, and to ensure that the sleeve hole 22 and the sleeve surface 12 do not deviate after being sleeved, and to evenly fill the hot-melt heat conductor to ensure a good thermal conductivity effect, the sleeve hole 22, the sleeve surface 12, the branch connection groove 14 and the main connection groove 13 are all rotational or spiral structures centered on the axis of the flow channel 11, and the main connection groove 13 does not pass through both ends of the sleeve hole 22 or the sleeve surface 12.

[0047] In this embodiment, the sleeve hole 22, the sleeve surface 12 and the main connection groove 13 are cylindrical structures, and the branch connection groove 14 is a spiral groove structure. In other embodiments, the branch connection grooves 14 can also be designed as annular grooves that are not connected to each other.

[0048] Furthermore, in order to facilitate the filling of the hot-melt heat conductor, a balancing hole 16 is provided at one end of the main connection groove 13 to connect the main connection groove 13 with the outside.

[0049] Furthermore, an exhaust hole 15 is provided at the other end of the main connection groove 13 opposite to the balance hole 16 to connect the main connection groove 13 with the outside.

[0050] For example, in step S3 of the assembly steps of this embodiment, the balance hole 16 can balance the liquid level of the hot-melt heat conductor in the main connection groove 13 and the branch connection groove 14 with the liquid level in the crucible to ensure that the hot-melt heat conductor is fully filled. If the balance hole 16 is not provided, after the lower end sleeve surface 12 is sleeved with the lower end of the sleeve hole 22, a small gap will prevent the hot-melt heat conductor from entering the main connection groove 13 and the branch connection groove 14, thereby forming a cavity, affecting the connection and heat conduction effect.

[0051] The exhaust hole 15 can prevent the main connection groove 13 and the branch connection groove 14 from forming an air pressure difference with the outside, thereby preventing the hot-melt heat conductor from entering the main connection groove 13 and the branch connection groove 14 .

[0052] Furthermore, in order to reduce the inadequate filling of the hot melt thermal conductor due to the sharp corners, affecting the thermal conductivity, such as Figure 4 As shown, the cross-sectional contour lines of the branch connection grooves 14 are tangent and continuous.

[0053] Furthermore, in order to better adapt to the currently common aluminum alloy die-casting process, the hot-melt heat conductor is an aluminum-copper alloy with a melting point of not less than 680 degrees Celsius.

[0054] Furthermore, the mass percentage of aluminum in the aluminum-copper alloy is 40-60%, the mass percentage of copper is 40-60%, and the melting point of the aluminum-copper alloy is 760-800 degrees Celsius.

[0055] In this embodiment, aluminum-copper alloy is used as a hot-melt heat conductor, which has good thermal conductivity and a suitable melting point. In an aluminum alloy die-casting factory, an aluminum-copper alloy with a suitable melting point can be easily obtained by adding an appropriate amount of copper to commonly used die-casting aluminum alloy raw materials such as ADC12.

[0056] Moreover, the use of aluminum-copper alloy filling can prevent the gate sleeve and the cooling sleeve from being affected by rust and dirt after use, thereby maintaining good thermal conductivity and having good stability.

[0057] At present, in the common aluminum alloy die-casting process, the temperature of the aluminum alloy melt is between 630 and 730 degrees Celsius. The melting point of the aluminum-copper alloy is set to 760 to 800 degrees Celsius, which can be applied to all current aluminum alloy die-casting processes. And it is not higher than 800 degrees Celsius. When assembling in the assembly steps of this embodiment, the aluminum-copper alloy can be better prevented from diffusing and penetrating on the surface of the gate sleeve 10 and the cooling sleeve 20, so that after assembly, the external aluminum-copper alloy is easy to clean.

[0058] The assembly method of this embodiment comprises the following steps:

[0059] S1, placing a hot melt heat conductor into a crucible and heating it until it melts;

[0060] S2, after sealing the inlet and outlet of the water channel 21 of the cooling jacket 20, the cooling jacket 20 is placed in a hot-melt heat conductor, and the main connecting groove 13 and / or the branch connecting groove 14 are immersed in the melt;

[0061] S3, insert the sleeve surface 12 of the sprue sleeve 10 into the sleeve hole 22 of the cooling sleeve 20 with the balancing hole 16 facing downward;

[0062] S4, take out the combination of the sprue sleeve 10 and the cooling sleeve 20, and clean the external hot-melt heat conductor after cooling.

[0063] Complete the assembly.

[0064] In this embodiment, when separation is required, the hot-melt heat conductor is heated until it melts, and then the gate sleeve 10 and the cooling sleeve 20 can be separated.

[0065] Furthermore, in order to facilitate cleaning of the external hot-melt heat conductor, before step S2, a release agent is applied to the area outside the main connection groove 13 and the branch connection groove 14.

[0066] Furthermore, in order to improve the adhesion of the hot-melt heat conductor in the main connection groove 13 and the branch connection groove 14 , before step S2 , the surfaces of the main connection groove 13 and the branch connection groove 14 are infiltrated with aluminum.

[0067] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the patent claims of the present invention.

Claims

1. A high thermal conductivity die casting mold sprue sleeve with an easily detachable cooling sleeve, comprising a sprue sleeve (10) with a flow channel (11) disposed inside and a cooling sleeve (20) with a water channel (21) disposed inside, characterized in that: The outer side of the gate sleeve (10) is provided with a sleeve surface (12), the inner side of the cooling sleeve (20) is provided with a sleeve hole (22) penetrating the cooling sleeve (20), and the sleeve hole (22) is sleeved with the sleeve surface (12); The sleeve hole (22) and the sleeve surface (12) are provided with more than two branch connection grooves (14) recessed in the sleeve hole (22) and the sleeve surface (12); a main connection groove (13) recessed in the sleeve hole (22) and the sleeve surface (12) is provided between the branch connection groove (14) and the sleeve hole (22) and / or between the branch connection groove (14) and the sleeve surface (12); the main connection groove (13) enables all the branch connection grooves (14) to communicate with each other; The main connection groove (13) and the branch connection groove (14) are filled with a hot-melt heat conductor.

2. A high thermal conductivity die casting mold sprue sleeve with an easily detachable cooling sleeve as claimed in claim 1, characterized in that: The sleeve hole (22), the sleeve surface (12), the branch connection groove (14) and the main connection groove (13) are all rotational or spiral structures centered on the axis of the flow channel (11), and the main connection groove (13) does not pass through both ends of the sleeve hole (22) or the sleeve surface (12).

3. A high thermal conductivity die casting mold sprue sleeve with an easily detachable cooling sleeve as claimed in claim 1, characterized in that: One end of the main connection groove (13) is provided with a balancing hole (16) for connecting the main connection groove (13) with the outside.

4. A high thermal conductivity die casting mold sprue sleeve with easily detachable cooling sleeve as claimed in claim 3, characterized in that: The other end of the main connection groove (13) opposite to the balance hole (16) is provided with an exhaust hole (15) for connecting the main connection groove (13) with the outside.

5. The high thermal conductivity die casting mold sprue sleeve with easily detachable cooling sleeve as claimed in claim 1, characterized in that: The cross-sectional contour lines of the branch connection grooves (14) are tangent and continuous.

6. A high thermal conductivity die casting mold sprue sleeve with an easily detachable cooling sleeve as claimed in claim 1, characterized in that: The hot-melt heat conductor is an aluminum-copper alloy with a melting point not lower than 680 degrees Celsius.

7. A high thermal conductivity die casting mold sprue sleeve with easily detachable cooling sleeve as claimed in claim 6, characterized in that: The mass percentage of aluminum in the aluminum-copper alloy is 40-60%, the mass percentage of copper is 40-60%, and the melting point of the aluminum-copper alloy is 760-800 degrees Celsius.

8. A method for assembling a cooling sleeve and a sprue sleeve, comprising the sprue sleeve (10) according to claim 1, a cooling sleeve (20) and a hot-melt heat conductor, characterized in that: The following steps are involved: S1, placing a hot melt heat conductor into a crucible and heating it until it melts; S2, the inlet and outlet of the water channel (21) of the cooling jacket (20) are sealed and placed in a hot-melt heat conductor, and the main connecting groove (13) and / or the branch connecting groove (14) are immersed in the melt; S3, inserting the sleeve surface (12) of the sprue sleeve (10) into the sleeve hole (22) of the cooling sleeve (20); S4, taking out the combination of the sprue sleeve (10) and the cooling sleeve (20), cleaning the external hot-melt heat conductor after cooling, and completing the assembly.

9. The method for assembling a cooling sleeve and a sprue sleeve according to claim 8, characterized in that: Before the step S2, a release agent is applied to the area outside the main connection groove (13) and the branch connection groove (14).

10. The method for assembling a cooling jacket and a sprue bushing according to claim 8, characterized in that: Before the step S2, the surfaces of the main connection groove (13) and the branch connection groove (14) are infiltrated with aluminum.

Images