An apparatus and method for alternately spraying a cooling liquid and a mold release agent into a die-casting mold

Abstract

The application relates to the field of die-casting equipment, and particularly discloses a device and a method for alternately spraying a die-casting mold with cooling liquid and a mold-release agent, wherein a liquid path assembly of the device comprises a cooling liquid inlet, a mold-release agent inlet, a reversing valve, a filter and a water outlet; one inlet of the reversing valve is connected with the cooling liquid inlet, the other inlet of the reversing valve is connected with the mold-release agent inlet, the outlet of the reversing valve is connected with the inlet of the filter, the outlet of the filter is connected with the water outlet, and the water outlet is connected with a fixed-side spraying gun and a movable-side spraying gun respectively. By adding the cooling liquid inlet and the reversing valve to the spraying valve plate, the spraying gun can be used to spray the mold with the cooling liquid first after entering the mold, the mold temperature is reduced, the mold is sprayed with the mold-release agent, direct use of the mold-release agent for cooling the mold is avoided, the use amount of the mold-release agent is reduced, the die-casting production beat time is shortened, the production efficiency is improved, and the production manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of die casting equipment, in particular to a device and method for alternately spraying cooling liquid and mold release agent into a die casting mold. BACKGROUND

[0002] Die casting production using a mold is the most widely used in various metal casting processes, which uses the cavity of the mold to apply high pressure to the molten metal to extrude the workpiece. However, in the die casting process, the surface temperature of the mold is extremely high after completing the die casting, and the mold release agent needs to be sprayed after demolding, one is to assist the mold cooling, and the other is to make the mold release agent adhere to the surface of the mold to facilitate the next die casting and demolding.

[0003] However, the commonly used mold release agent requires the temperature of the mold surface to be less than or equal to 180℃ for optimal adhesion and function, and after demolding, the mold surface temperature can only be passively cooled to about 320℃, so a large amount of mold release agent needs to be sprayed into the mold through a spray gun to assist the mold cooling, so that the temperature of the mold is reduced to 180℃, and then the mold release agent can be better adhered to the surface of the mold, so that the next round of die casting production can begin. In this process, the mold release agent is relatively expensive, and the cooling effect is not as good as other coolants, which slows down the production efficiency to some extent and makes the die casting production cost relatively high. SUMMARY

[0004] In order to overcome the above problems, the present application provides a device for alternately spraying cooling liquid and mold release agent into a die casting mold. Apparatus and method for casting molds.

[0005] The present application provides a device for alternately spraying cooling liquid and mold release agent into a die casting mold, comprising: a fixed side spray gun, a movable side spray gun and a spray valve plate, a liquid path assembly and a control electric box are arranged on the spray valve plate, the liquid path assembly comprises a cooling liquid inlet, a mold release agent inlet, a reversing valve, a filter and a water outlet;

[0006] One of the inlets of the reversing valve is connected with the cooling liquid inlet, the other inlet of the reversing valve is connected with the mold release agent inlet, the outlet of the reversing valve is connected with the inlet of the filter, the outlet of the filter is connected with the water outlet, and the water outlet is connected with the fixed side spray gun and the movable side spray gun respectively;

[0007] A control circuit is arranged in the control electric box, and the control circuit is electrically connected with the reversing valve.

[0008] Preferably, the reversing valve is one of a pneumatic reversing valve, an electromagnetic reversing valve or a pneumatic electromagnetic valve.

[0009] Preferably, the liquid path assembly further comprises a water path pressure regulating valve, which is arranged between the filter and the water outlet, and the control circuit is electrically connected with the water path pressure regulating valve.

[0010] Preferably, the liquid path assembly further comprises a water path integrated seat; the water outlet comprises a movable mold water outlet and a fixed mold water outlet, the water path integrated seat is fixedly connected with the spray valve plate, one end of the water path integrated seat is connected with the filter, the other end of the water path integrated seat is connected with the movable mold water outlet and the fixed mold water outlet in parallel, the movable mold water outlet is connected with the movable side spray gun, and the fixed mold water outlet is connected with the fixed side spray gun.

[0011] The application further provides a method for alternately spraying a cooling liquid and a mold release agent into a die casting mold, which uses the equipment for alternately spraying a cooling liquid and a mold release agent into a die casting mold.

[0012] After the movable mold and the fixed mold are opened and the die casting workpiece is taken out, the fixed side spray gun and the movable side spray gun are controlled to move between the movable mold and the fixed mold;

[0013] The control circuit controls the reversing valve to conduct the cooling liquid inlet and the filter, so that the cooling liquid passes through the water outlet, is sprayed by the fixed side spray gun to the fixed mold, and is sprayed by the movable side spray gun to the movable mold, and simultaneously starts timing;

[0014] When the timing reaches a first preset time length, the control circuit controls the reversing valve to switch to conducting the mold release agent inlet and the filter, so that the mold release agent passes through the water outlet, is sprayed by the fixed side spray gun to the fixed mold, and is sprayed by the movable side spray gun to the movable mold; wherein the first preset time length is a spraying time length required for measuring in advance to cool the surface of the inner cavity of the die casting mold to 210-180℃ by spraying the cooling agent.

[0015] When the timing reaches a second preset time length, the spraying of the mold release agent is stopped, and the fixed side spray gun and the movable side spray gun are moved out of the movable mold and the fixed mold; wherein the second preset time length is a preset time value.

[0016] Preferably, one side of the spray gun is provided with a temperature sensor for measuring the temperature of the surface of the inner cavity of the die casting mold.

[0017] When the timing reaches the first preset time length, the control circuit controls the reversing valve to switch to conducting the mold release agent inlet and the filter, so that the mold release agent passes through the water outlet, is sprayed by the fixed side spray gun to the fixed mold, and is sprayed by the movable side spray gun to the movable mold, and the specific implementation steps are as follows:

[0018] The control circuit acquires the surface temperature of the inner cavity of the die casting mold through the temperature sensor.

[0019] When the surface temperature is less than or equal to 210 DEG C, the control circuit controls the reversing valve to switch to the on state of the mold release agent inlet and the filter, so that the mold release agent passes through the water outlet, and the mold release agent is sprayed to the fixed mold through the fixed side spray gun and to the movable mold through the movable side spray gun.

[0020] Preferably, the liquid path assembly further comprises a water path pressure regulating valve, which is arranged between the filter and the water outlet, and the control circuit is electrically connected with the water path pressure regulating valve.

[0021] When the timing reaches the second preset time length, the spraying of the mold release agent is stopped, and the fixed side spray gun and the movable side spray gun are moved out of the movable mold and the fixed mold.

[0022] When the timing reaches the second preset time length, the control circuit controls the water path pressure regulating valve to be completely closed to stop the spraying of the mold release agent.

[0023] The fixed side spray gun and the movable side spray gun are moved out of the movable mold and the fixed mold.

[0024] Preferably, a plurality of fixed side spray guns and a plurality of movable side spray guns are arranged respectively, and the start and stop of each fixed side spray gun and each movable side spray gun can be independently controlled.

[0025] The method for alternately spraying the die casting mold with the cooling liquid and the mold release agent further comprises the following steps:

[0026] When the cooling liquid and the mold release agent are sprayed, each fixed side spray gun and each movable side spray gun is selectively controlled according to the structure of the mold and the relative positions of the fixed side spray gun and the movable side spray gun.

[0027] The present application has the following beneficial effects:

[0028] By adding the cooling liquid inlet and the reversing valve on the spray valve plate, the cooling liquid can be used to spray the mold after the spray gun enters the mold, so that the temperature of the mold is reduced to 180 DEG C to 210 DEG C, and then the mold release agent is sprayed, so that the temperature can better adhere to the mold release agent, and direct use of the mold release agent for mold cooling is avoided, the use amount of the mold release agent is reduced, and the production cycle of the die casting is shortened. Cycle time (CT) is produced, production efficiency is improved, production manufacturing cost is reduced, and the production of castings The by-product left in the die casting process is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below in conjunction with the drawings of the specification, in which:

[0030] Figure 1 The method flow chart of the first embodiment of the present application is shown in the figure.

[0031] Figure 2 The spray valve plate schematic diagram of the second embodiment of the present application is shown in the figure.

[0032] Figure 3 This is a schematic diagram of the mold and spray assembly according to Embodiment 2 of the present invention.

[0033] In the diagram: 1. Coolant inlet; 2. Release agent inlet; 3. Reversing valve; 4. Y-type filter; 5. Main air source inlet; 6. Air source filter; 7. Air source pressure regulating valve; 8. First pressure gauge; 9. Pressure sensor; 10. Silencer; 11. Control air source pressure regulating valve; 12. Second pressure gauge; 13. Atomizing air source pressure regulating valve; 14. Control box; 15. Moving mold outlet; 16. Fixed mold outlet; 17. Water circuit pressure regulating valve; 18. Moving mold air outlet; 19. Fixed mold air outlet; 20. 21. Moving mold control valve assembly; 22. Fixed mold control valve assembly; 23. Moving mold atomizing valve assembly; 24. Fixed mold atomizing valve assembly; 25. Pipeline; 26. Air circuit integrated base; 27. Water circuit integrated base; 28. Fixed side air blowing gun; 29. ​​Fixed side spray gun; 30. Fixed side integrated plate; 31. Fixed side water inlet; 32. Main connection plate; 33. Fixed mold; 34. Moving side air blowing gun; 35. Moving side spray gun; 36. Moving mold; 37. Moving mold frame; 38. Moving side integrated plate; 39. Moving side water inlet. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] See Figure 1 As an embodiment of the present invention, a device for alternately spraying coolant and release agent onto a die-casting mold is disclosed, including a fixed-side spray gun 28, a moving-side spray gun 34 and a spray valve plate. The spray valve plate is provided with an air circuit assembly, a liquid circuit assembly and a control box 14. The liquid circuit assembly includes a coolant inlet 1, a release agent inlet 2, a reversing valve 3, a Y-type filter 4 and a water outlet.

[0036] One inlet of the reversing valve 3 is connected to the coolant inlet 1, the other inlet of the reversing valve 3 is connected to the release agent inlet 2, the outlet of the reversing valve 3 is connected to the inlet of the Y-type filter 4, the outlet of the Y-type filter 4 is connected to the water outlet, and the water outlet is connected to the fixed-side spray gun 28 and the moving-side spray gun 34 respectively.

[0037] The control box 14 is equipped with a control circuit, which is electrically connected to the reversing valve 3.

[0038] The embodiment also discloses a method for spraying a cooling liquid and a mold release agent into a die-casting mold alternately, and the method comprises the following steps:

[0039] S1, opening the mold: after the movable mold 35 and the fixed mold 32 are opened and the die-casting workpiece is taken out, the fixed-side spray gun 28 and the movable-side spray gun 34 are controlled to move between the movable mold 35 and the fixed mold 32;

[0040] S2, spraying the cooling liquid: the control circuit controls the switching valve 3 to be in conduction with the cooling liquid inlet 1 and the Y-shaped filter 4, so that the cooling liquid passes through the water outlet and is sprayed to the fixed mold through the fixed-side spray gun 28 and to the movable mold through the movable-side spray gun 34, and the timing is started at the same time;

[0041] S3, spraying the mold release agent: when the timing reaches the first preset time length, the control circuit controls the switching valve 3 to be switched to be in conduction with the mold release agent inlet 2 and the Y-shaped filter 4, so that the mold release agent passes through the water outlet and is sprayed to the fixed mold through the fixed-side spray gun 28 and to the movable mold through the movable-side spray gun 34; wherein the first preset time length is the spraying time length required for the surface of the die-casting mold cavity to be cooled to a temperature of 210-180 DEG C through spraying of the cooling liquid, and the first preset time length of the embodiment is seven seconds;

[0042] S4, stopping spraying: when the timing reaches the second preset time length, the spraying of the mold release agent is stopped, and the fixed-side spray gun 28 and the movable-side spray gun 34 are moved out of the movable mold 35 and the fixed mold 32; wherein the second preset time length is five seconds.

[0043] The switching valve 3 of the embodiment can be one of a pneumatic switching valve 3, an electromagnetic switching valve 3 or a pneumatic electromagnetic valve. The spraying of the mold release agent or the cooling liquid can be automatically switched by the control signal output by the control circuit and the switching valve 3, so that the operation is simple and easy to realize.

[0044] By adding the cooling liquid inlet 1 and the switching valve 3 to the spraying valve plate, the fixed-side spray gun 28 and the movable-side spray gun 34 can be used to spray the mold with water first after entering the mold, so that the temperature of the mold is reduced to 180-210 DEG C, and then the mold release agent is sprayed, the temperature at this time can better adhere to the mold release agent, and the use of the mold release agent for cooling the mold is avoided, the average spraying time of the mold release agent is reduced from 15 seconds to 5 seconds, and the use amount of the mold release agent is greatly reduced. At the same time, the cooling liquid with lower specific heat capacity and lower evaporation temperature is used to cool the mold, so that the cooling speed is faster, the cooling time is reduced, the die-casting production cycle (CT) time is shortened, and the production efficiency is improved, and the production manufacturing cost is reduced. The cooling liquid which will not be left on the surface of the mold is selected, and the spraying amount of the mold release agent is reduced, so that the by-products left on the surface of the mold and the casting can be reduced.

[0045] ReferenceFigure 2 and Figure 3 As the second embodiment of the present application, the difference between this embodiment and the first embodiment is that the liquid path assembly further comprises a water path pressure regulating valve 17, which is arranged between the Y-shaped filter 4 and the water outlet, and the control circuit is electrically connected with the water path pressure regulating valve 17. Through the water path pressure regulating valve 17, not only the start and stop of the spraying of the cooling liquid and the mold release agent can be controlled, but also the total pressure of the spraying can be adjusted, so as to accurately control the liquid output of the spraying.

[0046] The liquid path assembly further comprises a water path integrated seat 26; the water outlet comprises a movable mold water outlet 15 and a fixed mold water outlet 16, the water path integrated seat 26 is fixedly connected with the spraying valve plate, one end of the water path integrated seat 26 is connected with the Y-shaped filter 4, the other end of the water path integrated seat 26 is connected with the movable mold water outlet 15 and the fixed mold water outlet 16 in parallel, the movable mold water outlet 15 is connected with the movable side spray gun 34, and the fixed mold water outlet 16 is connected with the fixed side spray gun 28. Through the water path integrated seat 26, the movable mold water outlet 15 and the fixed mold water outlet 16 are fixed and branched to connect the movable side spray gun 34 and the fixed side spray gun 28 respectively.

[0047] Referring to Figure 2 The gas path assembly of this embodiment comprises a total gas source inlet 5, a gas source filter 6, a gas source pressure regulating valve 7, a first pressure gauge 8, a pressure sensor 9, a silencer 10, a control gas source pressure regulating valve 11, a second pressure gauge 12, an atomizing gas source pressure regulating valve 13 and a gas path integrated seat 25 connected through a pipeline 24. The gas path integrated seat 25 is provided with a movable mold gas blowing port 18 and a fixed mold gas blowing port 19.

[0048] The spraying valve plate is further provided with a movable mold control valve group 20, a fixed mold control valve group 21, a movable mold atomizing valve group 22 and a fixed mold atomizing valve group 23.

[0049] Referring to Figure 3 The die casting mold of this embodiment comprises a fixed mold 32, a movable mold frame 36 and a movable mold 35, the movable mold 35 is fixed on the movable mold frame 36, and the fixed mold 32 and the movable mold 35 are subjected to die casting processing through mold opening and closing.

[0050] The spraying assembly of this embodiment comprises a fixed side gas blowing gun 27, a fixed side spray gun 28, a fixed side integrated plate 29, a fixed side water inlet 30, a total connecting plate 31, a movable side gas blowing gun 33, a movable side spray gun 34, a movable mold 35, a movable mold frame 36, a movable side integrated plate 37 and a movable side water inlet 38.

[0051] The movable side water inlet 38 is connected with the movable mold water outlet 15, and the fixed side water inlet 30 is connected with the fixed mold water outlet 16.

[0052] The moving mold air inlet 18 is connected to the moving side air gun 33, and the fixed mold air inlet 19 is connected to the fixed side air gun 27. The high-pressure gas jet removes debris and excess liquid from the mold.

[0053] A temperature sensor is provided on one side of the spray gun for measuring the surface temperature of the inner cavity of the die-casting mold;

[0054] Step S3, spraying release agent, is implemented through the following steps:

[0055] S31. The control circuit obtains the surface temperature of the die-casting mold cavity through a temperature sensor.

[0056] S32. When the surface temperature is less than or equal to 210℃ (the range of this temperature threshold is 180℃ to 210℃), the control circuit controls the reversing valve 3 to switch to open the release agent inlet 2 and the Y-type filter 4, so that the release agent passes through the outlet, sprays the release agent onto the fixed mold through the fixed side spray gun 28, and sprays the release agent onto the moving mold through the moving side spray gun 34.

[0057] By using a temperature sensor to detect the surface temperature of the die-casting mold in real time, the length of the first preset time can be controlled more precisely, making the temperature control of the cooling process more accurate.

[0058] Step S4 of this embodiment, stopping the spraying, is implemented in the following steps:

[0059] S41. When the timer reaches the second preset duration, the control circuit controls the water pressure regulating valve 17 to close completely to stop the spraying of the release agent.

[0060] S42. Move the fixed-side spray gun 28 and the moving-side spray gun 34 out of the space between the moving mold 35 and the fixed mold 32.

[0061] Preferably, multiple fixed-side spray guns 28 and multiple moving-side spray guns 34 are provided, and the start and stop of each fixed-side spray gun 28 and each moving-side spray gun 34 can be controlled independently;

[0062] Therefore, the method of alternately spraying coolant and release agent onto the die-casting mold in this embodiment further includes the following steps:

[0063] S5. When spraying coolant and release agent, selective start-stop control is performed on each fixed-side spray gun 28 and each moving-side spray gun 34 according to the structure of the die-casting mold and the relative positions of the fixed-side spray gun 28 and the moving-side spray gun 34.

[0064] Step S5 involves selectively spraying different sections of the die-casting mold structure to achieve zoned cooling and release agent spraying.

[0065] Through the step, the usage amount and spraying sequence of the cooling liquid and the mold release agent are further optimized, and waste is reduced.

[0066] Preferably, in other embodiments, the spraying time of each spray gun can also be controlled individually, so as to more accurately quantitatively spray the cooling liquid and the mold release agent.

[0067] Preferably, the installation position of the spray gun can be designed and installed according to the structure and position of different die casting islands in the die casting mold, so as to improve the pertinence of the spraying area to the die casting mold.

[0068] It should be noted that the embodiments of the device and the apparatus described above are only illustrative and are not intended to limit the present application. Those skilled in the art can select part or all of the modules according to actual needs to achieve the purpose of the embodiment.

Claims

1. A method for alternately spraying a die casting mold with a cooling liquid and a mold release agent, using an apparatus for alternately spraying a die casting mold with a cooling liquid and a mold release agent, the apparatus comprising a fixed-side spray gun (28), a movable-side spray gun (34), and a spray valve plate, the spray valve plate being provided with a liquid path assembly and a control electric box (14), the liquid path assembly comprising a cooling liquid inlet (1), a mold release agent inlet (2), a reversing valve (3), a filter, and a water outlet; one inlet of the reversing valve (3) is connected to the cooling liquid inlet (1), another inlet of the reversing valve (3) is connected to the mold release agent inlet (2), an outlet of the reversing valve (3) is connected to an inlet of the filter, an outlet of the filter is connected to the water outlet, and the water outlet is connected to the fixed-side spray gun (28) and the movable-side spray gun (34) respectively; the control electric box (14) is provided with a control circuit, and the control circuit is electrically connected to the reversing valve (3); the method comprises the following steps: after the movable die (35) and the fixed die (32) are opened and the die casting workpiece is removed, controlling the fixed-side spray gun (28) and the movable-side spray gun (34) to move between the movable die (35) and the fixed die (32); the control circuit controls the reversing valve (3) to conduct the cooling liquid inlet (1) and the filter, so that the cooling liquid passes through the water outlet, is sprayed to the fixed die through the fixed-side spray gun (28), and is sprayed to the movable die through the movable-side spray gun (34), and simultaneously, the timing is started; when the timing reaches a first preset time length, the control circuit acquires the surface temperature of the die casting mold cavity through a temperature sensor, and when the surface temperature is less than or equal to 210℃, the control circuit controls the reversing valve (3) to switch to conducting the mold release agent inlet (2) and the filter, so that the mold release agent passes through the water outlet, is sprayed to the fixed die through the fixed-side spray gun (28), and is sprayed to the movable die through the movable-side spray gun (34); wherein the first preset time length is a spraying time length required for reducing the surface temperature of the die casting mold cavity to a range from 210℃ to 180℃ by spraying the cooling liquid; when the timing reaches a second preset time length, the spraying of the mold release agent is stopped, and the fixed-side spray gun (28) and the movable-side spray gun (34) are moved out of the movable die (35) and the fixed die (32); wherein the second preset time length is a preset time value; the method for alternately spraying a die casting mold with a cooling liquid and a mold release agent further comprises the following steps: when the cooling liquid and the mold release agent are sprayed, each fixed-side spray gun (28) and each movable-side spray gun (34) are selectively controlled to start and stop according to the structure of the mold and the relative positions of the fixed-side spray gun (28) and the movable-side spray gun (34). The reversing valve (3) is one of a pneumatic reversing valve (3), an electromagnetic reversing valve (3), or a pneumatic electromagnetic valve. ​ The liquid path assembly further comprises a water path pressure regulating valve (17) arranged between the filter and the water outlet, the control circuit is electrically connected with the water path pressure regulating valve (17), one side of the spray gun is provided with a temperature sensor for measuring the surface temperature of the inner cavity of the die casting mold; the fixed side spray gun (28) and the movable side spray gun (34) are respectively provided with a plurality of fixed side spray guns (28) and movable side spray guns (34), and the start and stop of each fixed side spray gun (28) and each movable side spray gun (34) can be independently controlled, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ 2. A method of alternately spraying a cooling liquid and a mold releasing agent to a die-casting mold according to claim 1, wherein ​ 3. The method of claim 1, wherein the method is characterized by: The liquid path assembly further comprises a water path integrated seat (26); the water outlet comprises a movable die water outlet (15) and a fixed die water outlet (16), the water path integrated seat (26) is fixedly connected with the spraying valve plate, one end of the water path integrated seat (26) is connected with the filter, the other end of the water path integrated seat (26) is connected with the movable die water outlet (15) and the fixed die water outlet (16) in parallel, the movable die water outlet (15) is connected with the movable side spray gun (34), and the fixed die water outlet (16) is connected with the fixed side spray gun (28).

4. The method of claim 1, wherein the method is characterized by: The liquid path assembly further comprises a water path pressure regulating valve (17), which is arranged between the filter and the water outlet, and the control circuit is electrically connected with the water path pressure regulating valve (17); When the timing reaches the second preset time length, the spraying of the mold release agent is stopped, and the fixed side spray gun (28) and the movable side spray gun (34) are moved out of the movable die mold (35) and the fixed die mold (32), and the specific implementation steps are as follows: When the timing reaches the second preset time length, the control circuit controls the water path pressure regulating valve (17) to be completely closed to stop the spraying of the mold release agent; The fixed side spray gun (28) and the movable side spray gun (34) are moved out of the movable die mold (35) and the fixed die mold (32).

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