Purification treatment method and device for investment casting recovered wax

Abstract

The invention belongs to the technical field of investment casting wax recovery, and relates to a purification treatment method and device for investment casting recovered wax, and the method comprises the following steps: adding clean tap water and a wax block needing to be treated and recovered into a container, heating the container and preserving heat, melting the wax block into wax liquid, and rolling and mixing the wax liquid with boiling water on a wax-water interface; the sundries precipitate and fall into the water bottom; the heating temperature is adjusted, heat preservation and standing are conducted, the wax liquid is separated from water, the wax liquid floats on the water surface, and residual impurities in the wax liquid are further precipitated; and taking out the wax liquid at the upper layer in the container to obtain the purified recycled wax. The device comprises a digital temperature controller and a barrel body composed of an inner barrel, an outer barrel and an oil storage barrel, an electric heating element is arranged in the oil storage barrel, wax liquid and water can be well arranged, impurities sink to the water bottom, at the moment, wax above the water liquid level can be completely discharged, and the impurities cannot be mixed in by mistake; the wax liquid treatment temperature and the technological process are stable and are not influenced by the number of impurities, and the method has the advantage of high operability.

Description

Technical Field

[0001] The invention belongs to the technical field of investment casting wax recovery, and in particular relates to a method and a device for purifying investment casting recovered wax. Background Art

[0002] In investment casting, medium-temperature wax is widely used to make fusible models. After the pouring system is combined, it is used as an intermediate carrier to form the casting cavity. After the casting is completed, the wax model and pouring system in the cavity are melted and flowed out through the dewaxing device. These wax materials can be reused after recycling and are mainly used to make ingates, runners, pouring cups, etc. to save costs.

[0003] The general wax recovery treatment device heats and melts the wax material, and then allows the impurities in the wax liquid to settle to the bottom of the wax liquid after standing to achieve the purpose of purification. This method has the following disadvantages:

[0004] 1) Impurities sink to the bottom of the wax liquid, but the specific precipitation and accumulation height of the impurities is unknown. When the wax is released, some impurities may be mixed back into the wax material;

[0005] 2) The wax liquid treatment temperature is difficult to control. When the temperature is too high, the wax liquid convection is disturbed. When the temperature is too low, the wax liquid is viscous and has poor fluidity, both of which will affect the impurity treatment effect.

[0006] Therefore, it is necessary for those skilled in the art to propose a new method and device for purifying and treating investment casting recycled wax so as to more conveniently and thoroughly separate impurities from the recycled wax. Summary of the invention

[0007] The purpose of the present invention is to better separate impurities from recovered wax without being affected by the impurity content and the operation process, thereby providing a method and device for purifying recovered wax from investment casting.

[0008] Based on the first aspect of the present invention, the technical solution proposed in this application is:

[0009] A method for purifying investment casting recycled wax, comprising the following steps:

[0010] S1. Add clean tap water and wax blocks to be processed and recycled into a container, wherein the raw material of the wax blocks is medium-temperature wax;

[0011] S2, after the wax block floats on the water surface, the container is heated and kept warm, so that the wax block is melted into wax liquid and mixed with boiling water at the wax-water interface, so that the debris is precipitated and falls to the bottom of the water;

[0012] S3, adjusting the heating temperature and keeping the temperature to stand, so that the wax liquid and water are separated, the wax liquid floats on the water surface, and the debris remaining in the wax liquid is further precipitated;

[0013] S4. Take out the wax liquid in the upper layer of the container to obtain the purified recycled wax.

[0014] Preferably, in step S2, the heating temperature is 110°C to 120°C, and the insulation time is 2h to 3h.

[0015] Preferably, in step S3, the adjusted heating temperature is 95° C. to 98° C., and the heat preservation and standing time is 4 h to 6 h.

[0016] More preferably, in step S4, the wax liquid can be taken out by suction, or a wax drain pipe can be set above the boundary between the wax liquid and water to take out the wax liquid.

[0017] Based on another aspect of the present invention, a device for realizing the above-mentioned investment casting recovered wax purification treatment method is also proposed, comprising a barrel body consisting of an inner barrel, an outer barrel and an oil storage barrel, the oil storage barrel is arranged on the inner side of the outer barrel, the inner barrel is arranged on the inner side of the oil storage barrel, the space between the inner barrel and the oil storage barrel is filled with heat transfer oil, the space between the oil storage barrel and the outer barrel is filled with an insulation layer, the oil storage barrel is provided with an electric heating element for heating the heat transfer oil and a thermocouple for measuring the oil temperature of the heat transfer oil, an observation window and a wax drain pipe are provided in the middle of the side wall of the inner barrel, and a sewage pipe is provided at the bottom of the inner barrel, the observation window, wax drain pipe and sewage pipe all pass through the oil storage barrel and the outer barrel in sequence and are connected to the outside, and a wax drain valve and a sewage valve are provided on the wax drain pipe and the sewage pipe respectively, and a cover is provided on the top of the barrel body.

[0018] Preferably, the bottom of the wax drain pipe is higher than the center line of the observation window, and the wax drain pipe forms a certain angle with the axis of the observation window in the radial direction of the barrel body. When in use, water is injected into the inner barrel to the center line of the observation window, which is convenient for observing whether the wax liquid is drained during the wax draining process.

[0019] Preferably, an oil filling port is provided at the top of the oil storage barrel, and an oil drain pipe is provided at the bottom. The oil drain pipe passes through the outer barrel and is connected to the outside, and an oil drain valve is provided on the oil drain pipe.

[0020] Preferably, the electric heating element is arranged at the bottom of the oil storage barrel, and the electric heating element includes a plurality of groups of U-shaped resistance wires or annular resistance wires, which is conducive to ensuring the uniformity of heating.

[0021] Preferably, it also includes a digital temperature controller, which is electrically connected to the thermocouple and the electric heating element, and collects temperature data through the digital temperature controller and performs heating control according to a set program.

[0022] Preferably, the cover body comprises two semicircular bakelite cover plates, and the two semicircular bakelite cover plates are connected by a hinge.

[0023] Preferably, the wax drain pipe and the sewage drain pipe are wrapped with a heating and heat-insulating sleeve, and the heating temperature can be set according to needs.

[0024] Preferably, the inner barrel is made of stainless steel plate, and the diameter of the inner barrel is 800mm-1200mm, the depth is 800mm-1000mm, and the bottom of the inner barrel is a conical structure.

[0025] The present invention also includes other steps, devices or components that enable a method and device for purifying investment casting recovered wax to be used normally, all of which are conventional means in the art. In addition, steps, devices and components not limited in the present invention all adopt the existing technology in the art.

[0026] The working principle of the present invention is to utilize the principle that the recovered wax and water have different densities and are immiscible, so that the recovered wax can float on the water surface and separate when cooled; utilize the good fluidity of water to facilitate the smooth separation and sinking of impurities; utilize the physical property of the fixed boiling point of water to stabilize the heating temperature and the treatment process.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention can make the wax liquid and the water layer distinct, and the impurities sink to the bottom of the water. At this time, all the wax above the water surface can be released without accidentally mixing the impurities. The wax liquid treatment temperature and process are stable and are not affected by the amount of impurities, and has the advantage of strong operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention in Example 2.

[0030] Figure 2 for Figure 1 Top view and partial cross-sectional view. DETAILED DESCRIPTION

[0031] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Example 1

[0033] This embodiment provides a method for purifying investment casting recovered wax, comprising the following steps:

[0034] S1. Add clean tap water and wax blocks to be processed and recycled into a container, wherein the raw material of the wax blocks is medium-temperature wax;

[0035] S2, after the wax block floats on the water surface, the container is heated and kept warm, so that the wax block is melted into wax liquid and mixed with boiling water at the wax-water interface, so that the debris is precipitated and falls to the bottom of the water;

[0036] S3, adjusting the heating temperature and keeping the temperature to stand, so that the wax liquid and water are separated, the wax liquid floats on the water surface, and the debris remaining in the wax liquid is further precipitated;

[0037] S4. Take out the wax liquid in the upper layer of the container to obtain the purified recycled wax.

[0038] Specifically, in step S2, the heating temperature is 110°C to 120°C, and the insulation time is 2h to 3h.

[0039] More specifically, in step S3, the adjusted heating temperature is 95°C to 98°C, and the heat preservation and standing time is 4h to 6h.

[0040] In addition, in step S4, a wax drain pipe is provided above the boundary between the wax liquid and water to take out the wax liquid.

[0041] Example 2

[0042] like Figures 1-2 As shown, this embodiment proposes a device for implementing the investment casting recovery wax purification treatment method described in Example 1, including a digital temperature controller (not shown in the figure) and a barrel body composed of an inner barrel 1, an outer barrel 2 and an oil storage barrel 3, wherein the oil storage barrel is arranged on the inner side of the outer barrel, the inner barrel is arranged on the inner side of the oil storage barrel, the bottom of the outer barrel is provided with a support leg 7, the space between the inner barrel and the oil storage barrel is filled with heat transfer oil 11, the space between the oil storage barrel and the outer barrel is filled with a heat insulation layer 10, and the oil storage barrel is provided with an electric heating The inner barrel is provided with an observation window 12 and a wax discharge pipe 13 in the middle of the side wall of the inner barrel, and a sewage discharge pipe 9 is provided at the bottom of the inner barrel. The observation window, wax discharge pipe and sewage discharge pipe are sequentially passed through the oil storage barrel and the outer barrel and connected to the outside world, and the wax discharge pipe and sewage discharge pipe are respectively provided with a wax discharge valve (not shown in the figure) and a sewage discharge valve (not shown in the figure). The top of the barrel body is provided with a cover 15, and the cover includes two semicircular bakelite cover plates, and the two semicircular bakelite cover plates are connected by a hinge. The digital temperature controller is electrically connected to the thermocouple and the electric heating element, and the temperature data is collected by the digital temperature controller and the heating control is performed according to the set program.

[0043] Specifically, the bottom of the wax drain pipe is higher than the center line of the observation window, and the wax drain pipe forms a 30° angle with the axis of the observation window in the radial direction of the barrel body. When in use, water 17 is injected into the inner barrel to the center line of the observation window, which is convenient for observing whether the wax liquid is drained during the wax draining process.

[0044] Specifically, an oil filling port 14 is provided at the top of the oil storage barrel, and an oil drain pipe is provided at the bottom. The oil drain pipe passes through the outer barrel and is connected to the outside. An oil drain valve 6 is provided on the oil drain pipe.

[0045] In this embodiment, the electric heating element is arranged at the bottom of the oil storage barrel, and the electric heating element includes a plurality of groups of U-shaped resistance wires, which is conducive to ensuring the uniformity of heating.

[0046] Specifically, the wax drain pipe and the sewage drain pipe are wrapped with a heating and heat-insulating sleeve 8, and the heating temperature can be set according to needs.

[0047] More specifically, the inner barrel is made of a stainless steel plate, and the diameter of the inner barrel is 800 mm to 1200 mm, the depth is 800 mm to 1000 mm, and the bottom of the inner barrel is a conical structure.

[0048] When in use, water is injected into the bottom of the inner barrel, and the recovered wax 16 floats on the water.

[0049] The working principle of the present invention is to utilize the principle that the recovered wax and water have different densities and are immiscible, so that the recovered wax can float on the water surface and separate when cooled; utilize the good fluidity of water to facilitate the smooth separation and sinking of impurities; utilize the physical property of the fixed boiling point of water to stabilize the heating temperature and the treatment process.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for purifying investment casting recovered wax, characterized in that: The steps include: S1. Add clean tap water and wax blocks to be processed and recycled into a container, wherein the raw material of the wax blocks is medium-temperature wax; S2, after the wax block floats on the water surface, the container is heated and kept warm, so that the wax block is melted into wax liquid and mixed with boiling water at the wax-water interface, so that the debris is precipitated and falls to the bottom of the water; S3, adjusting the heating temperature and keeping the temperature to stand, so that the wax liquid and water are separated, the wax liquid floats on the water surface, and the debris remaining in the wax liquid is further precipitated; S4. Take out the wax liquid in the upper layer of the container to obtain the purified recycled wax.

2. The method for purifying investment casting recovered wax according to claim 1, characterized in that: In step S2, the heating temperature is 110°C to 120°C, and the insulation time is 2h to 3h.

3. The method for purifying investment casting recovered wax according to claim 1, characterized in that: In step S3, the adjusted heating temperature is 95°C to 98°C, and the heat preservation and standing time is 4h to 6h.

4. A device for implementing the method for purifying investment casting recovered wax according to any one of claims 1 to 3, characterized in that: It comprises a barrel body consisting of an inner barrel, an outer barrel and an oil storage barrel, the oil storage barrel is arranged on the inner side of the outer barrel, the inner barrel is arranged on the inner side of the oil storage barrel, the space between the inner barrel and the oil storage barrel is filled with heat transfer oil, the space between the oil storage barrel and the outer barrel is filled with a heat preservation layer, the oil storage barrel is provided with an electric heating element for heating the heat transfer oil and a thermocouple for measuring the oil temperature of the heat transfer oil, an observation window and a wax drain pipe are arranged in the middle of the side wall of the inner barrel, and a sewage drain pipe is arranged at the bottom of the inner barrel, the observation window, wax drain pipe and sewage drain pipe all pass through the oil storage barrel and the outer barrel in sequence and are connected to the outside, and a wax drain valve and a sewage drain valve are arranged on the wax drain pipe and the sewage drain pipe respectively, and a cover body is arranged on the top of the barrel body.

5. The device according to claim 4, characterized in that: The bottom of the wax drain pipe is higher than the center line of the observation window, and the wax drain pipe forms a certain angle with the axis of the observation window in the radial direction of the barrel body.

6. The device according to claim 4, characterized in that: The top of the oil storage barrel is provided with an oil filling port, and the bottom is provided with an oil drain pipe, the oil drain pipe passes through the outer barrel and is connected to the outside, and the oil drain pipe is provided with an oil drain valve.

7. The device according to claim 4, characterized in that: The electric heating element is arranged at the bottom of the oil storage barrel, and the electric heating element includes a plurality of groups of U-shaped resistance wires or annular resistance wires.

8. The device according to claim 4, characterized in that: Also included is a digital thermostat, which is electrically connected to the thermocouple and the electric heating element.

9. The device according to claim 4, characterized in that: The wax discharge pipe and the sewage discharge pipe are wrapped with a heating and heat-insulating sleeve.

10. The device according to claim 4, characterized in that: The inner barrel is made of a stainless steel plate, and has a diameter of 800 mm to 1200 mm and a depth of 800 mm to 1000 mm. The bottom of the inner barrel is a conical structure.

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