Equipment and method for alternately spraying cooling liquid and release agent on die-casting die

Abstract

The invention relates to the field of die-casting equipment, and particularly discloses equipment and a method for alternately spraying a cooling liquid and a release agent on a die-casting die, and a liquid path assembly comprises a cooling liquid inlet, a 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 release agent inlet, an outlet of the reversing valve is connected with an inlet of the filter, an outlet of the filter is connected with the water outlet, and the water outlet is respectively connected with the fixed side spray gun and the movable side spray gun. The cooling liquid inlet and the reversing valve are additionally arranged on the spraying valve plate, cooling liquid is used for spraying a mold after a spraying gun enters the mold range, release agent spraying is switched after the temperature of the mold is reduced, it is avoided that the release agent is directly used for cooling the mold, the use amount of the release agent is reduced, the die casting production takt time is shortened, and the production efficiency is improved. The production efficiency is improved and the production and manufacturing cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of die-casting equipment, and in particular to equipment and a method for alternately spraying a coolant and a mold release agent on a die-casting mold. Background Art

[0002] Die casting using molds is the most widely used metal casting process. It uses the inner cavity of the mold to apply high pressure to the molten metal to squeeze the workpiece into shape. However, in the die casting process, the surface temperature of the mold is extremely high after the die casting is completed. After demolding, it is necessary to spray a release agent, one is to assist the mold to cool down, and the other is to make the release agent adhere to the surface of the mold to facilitate the next die casting and demolding.

[0003] However, the best adhesion and effective temperature of commonly used mold release agents requires the temperature of the mold surface to be less than or equal to 180°C. After demolding, the mold surface temperature can generally only be passively cooled to about 320°C. A spray gun needs to be inserted into the mold to spray a large amount of mold release agent to assist in cooling the mold. After the temperature is reduced to 180°C, the mold release agent can better adhere to the mold surface, so that the next round of die-casting production can begin. In this process, the mold release agent has a high cost, and the cooling effect is not as good as other coolants, which slows down the production efficiency to a certain extent and makes the cost of die-casting production high. Summary of the invention

[0004] In order to overcome the above problems, the present invention provides a cooling liquid and a mold release agent alternately spraying pressure Casting mold equipment and method.

[0005] The present invention provides a device for alternately spraying a coolant and a mold release agent on a die-casting mold, comprising: a fixed-side spray gun, a moving-side spray gun and a spray valve plate, the spray valve plate is provided with a liquid circuit component and a control electric box, the liquid circuit component comprises a coolant 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 to the coolant inlet, the other inlet of the reversing valve is connected to the mold release agent inlet, the outlet of the reversing valve is connected to the inlet of the filter, the outlet of the filter is connected to the water outlet, and the water outlet is connected to the fixed side spray gun and the moving side spray gun respectively;

[0007] A control circuit is arranged in the control electric box, and the control circuit is electrically connected to 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 circuit assembly further includes a water circuit pressure regulating valve, the water circuit pressure regulating valve is arranged between the filter and the water outlet, and the control circuit is electrically connected to the water circuit pressure regulating valve.

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

[0011] The present invention also provides a method for alternately spraying a coolant and a mold release agent on a die-casting mold, and the method uses the above-mentioned device for alternately spraying a coolant and a mold release agent on a die-casting mold, comprising the following steps:

[0012] After the movable mold and the fixed mold are opened and the die-cast 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 coolant inlet and the filter, so that the coolant passes through the water outlet, sprays the coolant to the fixed mold through the fixed side spray gun, and sprays the coolant to the movable mold through the movable side spray gun, and starts timing at the same time;

[0014] When the timing reaches the first preset time, the control circuit controls the reversing valve to switch to 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 the mold release agent is sprayed to the movable mold through the movable side spray gun; wherein the first preset time is the spraying time required to cool the inner cavity surface of the die-casting mold to between 210°C and 180°C by spraying coolant measured in advance;

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

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

[0017] When the timing reaches the first preset time, the control circuit controls the reversing valve to switch to conduct 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 on the fixed mold through the fixed side spray gun, and the mold release agent is sprayed on the movable mold through the movable side spray gun. The specific implementation steps are as follows:

[0018] The control circuit obtains 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°C, the control circuit controls the reversing valve to switch to the release agent inlet and the filter, so that the release agent passes through the water outlet, sprays the release agent to the fixed mold through the fixed side spray gun, and sprays the release agent to the movable mold through the movable side spray gun.

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

[0021] When the timing reaches the second preset time, the spraying of the release agent is stopped, and the fixed side spray gun and the movable side spray gun are moved out from between the movable mold and the fixed mold. The specific implementation steps are as follows:

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

[0023] Move the fixed side spray gun and the movable side spray gun out from between the movable mold and the fixed mold.

[0024] Preferably, the fixed side spray gun and the moving side spray gun are provided in plurality, and the start and stop of each fixed side spray gun and each moving side spray gun can be independently controlled;

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

[0026] When spraying the coolant and the release agent, each fixed side spray gun and each moving side spray gun are selectively started and stopped according to the structure of the mold and the relative positions of the fixed side spray gun and the moving side spray gun.

[0027] The beneficial effects of the present invention are:

[0028] By adding a coolant inlet and a reversing valve to the spray valve plate, the spray gun can first spray the mold with coolant after entering the mold range, and then switch to spraying the mold release agent after the mold temperature drops to between 180℃ and 210℃. The temperature at this time can better adhere to the mold release agent, and avoid directly using the mold release agent to cool the mold, reduce the amount of mold release agent used, and shorten the die casting production cycle. Cycle time (CT) improves production efficiency, reduces production costs, and reduces the cost of castings. The by-products left behind. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 This is a flow chart of a method according to Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of a spray valve plate according to a second embodiment of the present invention;

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

[0033] In the figure: 1. Coolant inlet; 2. Release agent inlet; 3. Reversing valve; 4. Y-type filter; 5. Total air source inlet; 6. Air source filter; 7. Air source pressure regulating valve; 8. First pressure gauge; 9. Pressure sensor; 10. Muffler; 11. Control air source pressure regulating valve; 12. Second pressure gauge; 13. Atomizing air source pressure regulating valve; 14. Control electrical box; 15. Moving mold water outlet; 16. Fixed mold water outlet; 17. Waterway pressure regulating valve; 18. Moving mold air blowing port; 19. Fixed mold air blowing port; 20 , movable mold control valve group; 21, fixed mold control valve group; 22, movable mold atomization valve group; 23, fixed mold atomization valve group; 24, pipeline; 25, air circuit integrated seat; 26, water circuit integrated seat; 27, fixed side air blowing gun; 28, fixed side spray gun; 29, fixed side integrated plate; 30, fixed side water inlet; 31, main connecting plate; 32, fixed mold; 33, movable side air blowing gun; 34, movable side spray gun; 35, movable mold; 36, movable mold frame; 37, movable side integrated plate; 38, movable side water inlet. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 As a first embodiment of the present invention, a device for alternately spraying a coolant and a release agent on a die-casting mold is disclosed, comprising a fixed-side spray gun 28, a moving-side spray gun 34 and a spray valve plate, on which an air circuit assembly, a liquid circuit assembly and a control electrical box 14 are provided, and the liquid circuit assembly comprises 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 mold 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] A control circuit is arranged in the control electric box 14 , and the control circuit is electrically connected to the reversing valve 3 .

[0038] This embodiment also discloses a method for alternately spraying a coolant and a mold release agent on a die-casting mold, and a device for alternately spraying a coolant and a mold release agent on a die-casting mold comprises the following steps:

[0039] S1, mold opening: after the movable mold 35 and the fixed mold 32 are opened and the die-cast 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 coolant; the control circuit controls the reversing valve 3 to conduct the coolant inlet 1 and the Y-type filter 4, so that the coolant passes through the water outlet, sprays the coolant to the fixed mold through the fixed side spray gun 28, and sprays the coolant to the movable mold through the movable side spray gun 34, and starts timing at the same time;

[0041] S3, spraying mold release agent: when the timing reaches the first preset time, the control circuit controls the reversing valve 3 to switch to the mold release agent inlet 2 and the Y-type filter 4, 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 28, and the mold release agent is sprayed to the movable mold through the movable side spray gun 34; wherein, the first preset time is the spraying time required to cool the inner cavity surface of the die-casting mold to between 210°C and 180°C by spraying the coolant, which is measured in advance, and the first preset time in this embodiment is seven seconds;

[0042] S4, stop spraying: when the timing reaches the second preset time, stop spraying the release agent, and move the fixed side spray gun 28 and the movable side spray gun 34 out from between the movable mold 35 and the fixed mold 32; wherein the second preset time is five seconds.

[0043] The reversing valve 3 of this embodiment can be one of a pneumatic reversing valve 3, an electromagnetic reversing valve 3 or a pneumatic electromagnetic valve. Whether to spray the release agent or the coolant, the reversing valve 3 can be controlled by the control signal output by the control circuit to realize automatic switching, which is simple to operate and easy to realize.

[0044] This embodiment adds a coolant inlet 1 and a reversing valve 3 to the spray valve plate, so that after the spray gun enters the mold range, it can first use clean water to spray the mold, so that the mold temperature drops to between 180°C and 210°C, and then switch to spraying the mold release agent. The temperature at this time can better adhere to the mold release agent, and avoid directly using the mold release agent to cool the mold. The average spraying time of the mold release agent is reduced from 15 seconds to 5 seconds, which greatly reduces the amount of mold release agent used. At the same time, a coolant with a lower specific heat capacity and evaporation temperature is used to cool the mold, which has a faster cooling speed, reduces the cooling time, and shortens the die-casting production cycle (CT) time, thereby improving production efficiency and reducing production costs. Selecting a coolant that will not remain on the mold surface and reducing the amount of mold release agent sprayed can reduce by-products left on the mold surface and in the casting.

[0045] See also Figure 2 and Figure 3 As the second embodiment of the present invention, the difference between this embodiment and the first embodiment is that the liquid circuit assembly further includes a water circuit pressure regulating valve 17, which is arranged between the Y-type filter 4 and the water outlet, and the control circuit is electrically connected to the water circuit pressure regulating valve 17. The water circuit pressure regulating valve 17 can not only control the start and stop of the spraying of the coolant and the mold release agent, but also adjust the total pressure of the spraying, thereby accurately controlling the amount of liquid sprayed.

[0046] The liquid circuit assembly also includes a water circuit integrated seat 26; the water outlet includes a movable mold water outlet 15 and a fixed mold water outlet 16, the water circuit integrated seat 26 is fixedly connected to the spray valve plate, one end of the water circuit integrated seat 26 is connected to the Y-type filter 4, and the other end of the water circuit integrated seat 26 is connected in parallel with the movable mold water outlet 15 and the fixed mold water outlet 16, the movable mold water outlet 15 is connected to the movable side spray gun 34, and the fixed mold water outlet 16 is connected to the fixed side spray gun 28. The movable side spray gun 34 and the fixed side spray gun 28 are connected respectively through the fixed and diverted water outlets of the water circuit integrated seat 26 through the movable mold water outlet 15 and the fixed mold water outlet 16 connected in parallel.

[0047] See also Figure 2 The gas circuit assembly of this embodiment includes 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 muffler 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 circuit integrated seat 25 connected by a pipeline 24. The gas circuit integrated seat 25 is provided with a movable mold blowing port 18 and a fixed mold blowing port 19.

[0048] The spray valve plate is also 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] See also Figure 3 The die-casting mold of this embodiment includes 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. The fixed mold 32 and the movable mold 35 perform die-casting processing by opening and closing the mold.

[0050] The spray assembly of this embodiment includes a fixed side air blowing gun 27, a fixed side spray gun 28, a fixed side integrated plate 29, a fixed side water inlet 30, a main connecting plate 31, a moving side air blowing gun 33, a moving side spray gun 34, a moving mold 35, a moving mold frame 36, a moving side integrated plate 37 and a moving side water inlet 38.

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

[0052] The movable mold blowing port 18 is connected to the movable side blowing gun 33, and the fixed mold blowing port 19 is connected to the fixed side blowing gun 27. The impurities and excess liquid in the mold are removed by spraying high-pressure gas.

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

[0054] Step S3, spraying a mold release agent, the specific steps of which are as follows:

[0055] S31, the control circuit obtains the surface temperature of the inner cavity of the die-casting mold through the temperature sensor;

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

[0057] The surface temperature of the die-casting mold is detected in real time by a temperature sensor, so as to more accurately control the length of the first preset time, thereby making the temperature control of the cooling process more accurate.

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

[0059] S41, when the timing reaches the second preset time, the control circuit controls the water circuit pressure regulating valve 17 to be completely closed to stop the spraying of the mold release agent;

[0060] S42, move the fixed side spray gun 28 and the movable side spray gun 34 out from between the movable mold 35 and the fixed mold 32.

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

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

[0063] S5. When spraying the coolant and the mold release agent, each fixed side spray gun 28 and each moving side spray gun 34 are selectively started and stopped 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 is to selectively spray the different die-casting mold structures in different zones to achieve cooling and spraying of release agent in different zones.

[0065] This step further optimizes the usage and spraying sequence of coolant and release agent to reduce waste.

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

[0067] Preferably, the installation position of the spray gun can be designed specifically according to the structure and position of different die-casting islands in the die-casting mold, and installed according to the manufacturing structure, thereby improving the pertinence of the spray area to the die-casting mold.

[0068] It should be noted that the embodiments of the equipment and devices described above are merely illustrative and are not intended to limit the present invention. Those skilled in the art may select some or all of the modules therein according to actual needs to achieve the purpose of the present embodiment.

Claims

1. A device for alternately spraying a coolant and a mold release agent on a die-casting mold, comprising a fixed-side spray gun, a moving-side spray gun and a spray valve plate, wherein a liquid circuit assembly and a control electric box are provided on the spray valve plate, characterized in that: The liquid circuit assembly includes a coolant inlet, a mold release agent inlet, a reversing valve, a filter and a water outlet; One of the inlets of the reversing valve is connected to the coolant inlet, the other inlet of the reversing valve is connected to the mold release agent inlet, the outlet of the reversing valve is connected to the inlet of the filter, the outlet of the filter is connected to the water outlet, and the water outlet is connected to the fixed side spray gun and the moving side spray gun respectively; A control circuit is arranged in the control electric box, and the control circuit is electrically connected to the reversing valve.

2. The device for alternately spraying a coolant and a mold release agent on a die casting mold according to claim 1, characterized in that: The reversing valve is one of a pneumatic reversing valve, an electromagnetic reversing valve or a pneumatic electromagnetic valve.

3. The device for alternately spraying a coolant and a mold release agent on a die casting mold according to claim 1, characterized in that: The liquid circuit assembly also includes a water circuit pressure regulating valve, which is arranged between the filter and the water outlet, and the control circuit is electrically connected to the water circuit pressure regulating valve.

4. The device for alternately spraying a coolant and a mold release agent on a die casting mold according to claim 1, characterized in that: The liquid circuit assembly also includes a water circuit integrated seat; the water outlet includes a movable mold water outlet and a fixed mold water outlet, the water circuit integrated seat is fixedly connected to the spray valve plate, one end of the water circuit integrated seat is connected to the filter, and the other end of the water circuit integrated seat is connected in parallel to the movable mold water outlet and the fixed mold water outlet, the movable mold water outlet is connected to the movable side spray gun, and the fixed mold water outlet is connected to the fixed side spray gun.

5. A method for alternately spraying a coolant and a mold release agent on a die casting mold, using the device for alternately spraying a coolant and a mold release agent on a die casting mold as claimed in any one of claims 1 to 4, characterized in that: The steps include: After the movable mold and the fixed mold are opened and the die-cast 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; The control circuit controls the reversing valve to conduct the coolant inlet and the filter, so that the coolant passes through the water outlet, sprays the coolant to the fixed mold through the fixed side spray gun, and sprays the coolant to the movable mold through the movable side spray gun, and starts timing at the same time; When the timing reaches the first preset time, the control circuit controls the reversing valve to switch to 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 the mold release agent is sprayed to the movable mold through the movable side spray gun; wherein the first preset time is the spraying time required to cool the inner cavity surface of the die-casting mold to between 210°C and 180°C by spraying coolant measured in advance; When the timing reaches the second preset time, the spraying of the release agent is stopped, and the fixed side spray gun and the movable side spray gun are moved out from between the movable mold and the fixed mold; wherein the second preset time is a preset time value.

6. The method of alternately spraying a coolant and a mold release agent on a die casting mold according to claim 5, characterized in that: A temperature sensor for measuring the surface temperature of the inner cavity of the die-casting mold is provided on one side of the spray gun; When the timing reaches the first preset time, the control circuit controls the reversing valve to switch to conduct 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 on the fixed mold through the fixed side spray gun, and the mold release agent is sprayed on the movable mold through the movable side spray gun. The specific implementation steps are as follows: The control circuit obtains the surface temperature of the inner cavity of the die-casting mold through the temperature sensor; When the surface temperature is less than or equal to 210°C, the control circuit controls the reversing valve to switch to the release agent inlet and the filter, so that the release agent passes through the water outlet, sprays the release agent to the fixed mold through the fixed side spray gun, and sprays the release agent to the movable mold through the movable side spray gun.

7. The method of alternately spraying a coolant and a mold release agent on a die casting mold according to claim 5, characterized in that: The liquid circuit assembly further includes a water circuit pressure regulating valve, which is disposed between the filter and the water outlet, and the control circuit is electrically connected to the water circuit pressure regulating valve; When the timing reaches the second preset time, the spraying of the release agent is stopped, and the fixed side spray gun and the movable side spray gun are moved out from between the movable mold and the fixed mold. The specific implementation steps are as follows: When the timing reaches the second preset time, the control circuit controls the water circuit pressure regulating valve to be completely closed to stop the spraying of the mold release agent; Move the fixed side spray gun and the movable side spray gun out from between the movable mold and the fixed mold.

8. The method of alternately spraying a coolant and a mold release agent on a die casting mold according to claim 5, characterized in that: There are a plurality of fixed-side spray guns and a plurality of moving-side spray guns, and the start and stop of each fixed-side spray gun and each moving-side spray gun can be independently controlled; The method for alternately spraying the coolant and the mold release agent on the die casting mold further comprises the following steps: When spraying the coolant and the release agent, each fixed side spray gun and each moving side spray gun are selectively started and stopped according to the structure of the mold and the relative positions of the fixed side spray gun and the moving side spray gun.

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