Heat-preservation and energy-saving type hot core box mold

Abstract

The utility model discloses a heat preservation and energy saving type hot core box mold which comprises a movable mold body, a fixed mold body and a heating pipe, the periphery of the movable mold body and the fixed mold body is covered with a heat preservation coating, and heat insulation plates are arranged on the periphery of the movable mold body and the fixed mold body and on the heat preservation coating. And protection plates are arranged on the periphery of the movable and fixed mold body and on the heat insulation plate. And a surface-mounted temperature sensor is arranged between the heat insulation plate and the protection plate and is externally and electrically connected with a temperature control instrument. Internal heat of the movable and fixed mold body can be conducted through the surface of the movable and fixed mold body, the heat preservation coating, the heat insulation plate and the protection plate and then can be convected with ambient air, so that the surface temperature of the protection plate is obviously reduced, the verification temperature can be reduced to 50-80 DEG C from 210-250 DEG C, the energy consumption is reduced by about 25%, and the heat insulation and heat preservation mold can be continuously used. Therefore, the labor environment, the personal safety, the energy conservation and the consumption reduction of operators are greatly improved.

Description

Technical Field

[0001] The invention relates to a tooling facility, in particular to a hot core box mould for making sand cores. Background Art

[0002] In the semi-permanent mold casting process, products with complex structures and internal cavities often require the use of sand cores. Currently, there are three common sand core production processes: hot core, cold core, and warm core. Hot cores are widely used in aluminum alloy casting due to their high strength and long shelf life. The hot core box mold used in the core making machine is designed with a heating device. The movable and fixed mold bodies are equipped with uniformly spaced heating tubes. Contact thermocouples inserted into the movable and fixed mold bodies monitor the internal mold temperature in real time. During the production of hot cores, such as cylinder head water channel sand cores, oil cavity sand cores, and air channel sand cores, the heating tubes are first energized. The heat generated by the heating tubes is then transferred to the hot core box mold, heating it to a specific process temperature, typically 260-310°C. During production, the heating tube's power switch is linked to the thermocouple temperature. When the temperature falls below the set process parameter, the heating tubes are energized for heating; otherwise, the heating tubes are de-energized and stop heating. Because the hot core production process requires no ramping up or down of the mold temperature, maintaining it continuously within the process temperature range, the hot core mold temperature is lost through convection on the mold surface. The extent of this convection depends on the core production line environment, resulting in energy loss. Furthermore, the high temperature of the hot core mold surface, typically 210-250°C, significantly impacts the operator's working environment and burn safety. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide a heat-insulating and energy-saving hot box mold which can keep the hot box mold warm and save energy.

[0004] The purpose of the present invention is achieved by the following technical solution: a heat-insulating and energy-saving hot core box mold, comprising a movable and fixed mold body, a heating tube, an insulation coating covering the movable and fixed mold body, and an insulation board installed around the movable and fixed mold body and on the insulation coating.

[0005] Protective plates are installed around the movable and fixed mold bodies and on the insulation board. A surface-mount temperature sensor is installed between the insulation board and the protective plate. This surface-mount temperature sensor is electrically connected to a temperature control instrument, providing real-time display of the surface temperature of the movable and fixed mold bodies. The protective plates are bent inward to wrap around the insulation board and the edges of the thermal insulation coating, effectively preventing them from falling off.

[0006] With this structural approach, heat from the movable and fixed mold bodies is conducted through their surfaces, the insulation coating, the insulation board, and the protective plate before being convected to the ambient air. This significantly reduces the surface temperature of the protective plate, lowering the verification temperature from 210-250°C to 50-80°C. This reduces energy consumption in the hot box mold by approximately 25%, and the insulation allows for continuous use. This significantly improves the operator's working environment, personal safety, and energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0008] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0009] Reference Figure 1 The heat-insulating and energy-saving hot core box mold of the present invention includes a movable and fixed mold body 1 (divided into an upper movable mold and a lower fixed mold), heating tubes 6 (six heating tubes arranged side by side), and a heat-insulating coating 2 (an inner layer or bottom layer, sprayed on the outer surfaces of the movable mold and the fixed mold, with a corresponding gap left between the movable mold and the fixed mold) is covered around the movable and fixed mold body 1. Insulation boards 3 (an intermediate layer) are installed around the movable and fixed mold body 1 and on the heat-insulating coating 2.

[0010] Protective plates 5 (outer layer, made of stainless steel) are installed around the movable and fixed mold bodies 1 and on the insulation plates 3. Chip temperature sensors 7 (eight in total, located around the perimeter and above and below) are installed between the insulation plates 3 and the protective plates 5. These chip temperature sensors 7 are electrically connected to a temperature control instrument 8 (installed on the core-making machine to facilitate monitoring of temperature changes and display the surface temperature of the movable and fixed mold bodies in real time). This allows for more precise control of the heating tubes, minimizing temperature differences between different regions within the movable and fixed mold bodies. The perimeter of the protective plates 5 is bent inward to enclose the edges of the insulation plates 3 and the thermal insulation coating 2, effectively preventing them from falling off. Several through-holes are provided in both the insulation plates 3 and the protective plates 5 to facilitate the insertion of bolts 4 for positioning and securing. Once the insulation plates and protective plates are properly positioned and fastened to the threaded holes on the surface of the movable and fixed mold bodies 1, additional through-holes ensure that the heating tubes 6 are exposed.

[0011] Combined with the attached drawings, the specific steps are as follows:

[0012] Step 1: Clean the surroundings of the movable and fixed mold body 1 respectively, and make sure there is no foreign matter or rust on the surface; Step 2: Evenly spray the thermal insulation coating 2 onto the surrounding surfaces of the movable and fixed mold body, while avoiding the heating tube and threaded hole parts. Through the paint spraying process, each spray thickness is about 2mm and then baked at 200℃ for 2h until its thickness reaches 8mm and baked into a block; Step 3: Use bolts 4 to pass through the outer protective plate 5, the middle layer insulation board 3, and the inner layer thermal insulation coating 2 respectively, and the protective plate 5 contacts the head of the bolt 4; Step 4: Connect and lock the bolts passed in the third step to the threaded holes on the corresponding parts of the movable and fixed mold body; Step 5: Heat the movable and fixed mold body to the temperature range required for the core making process under normal process, keep warm for 1h, and produce sand cores normally. Step 6: Connect the data of the SMD temperature sensor 7 to the temperature control instrument 8 on the core making machine, and set the left and right side temperature data of the movable and fixed mold body 1 to be associated with the heating tubes (four in number) on the left and right sides, and set the front and rear side temperature data of the movable and fixed mold body 1 to be associated with the heating tubes (two in the middle) in the middle, to form a heating temperature zone control.

[0013] The thermal insulation coating mentioned is mainly reflected in the uniform and air-gap-free coverage on the four sides of the movable and fixed mold bodies (the top and bottom of the mold bodies do not need to be sprayed because they are in direct contact with the core making machine). Its liquid state can be used to evenly cover and exclude the air between the thermal insulation coating and the surface layer of the movable and fixed mold bodies. Its low thermal conductivity characteristics are used to reduce the conduction rate of the surface temperature of the movable and fixed mold bodies. The thermal insulation board mentioned is mainly reflected in preventing the shedding of the paint coating and the reduction of the heat transfer coefficient of the thermal insulation coating surface, and blocking the contact between the thermal insulation coating and the air. The protective plate mentioned is mainly reflected in preventing the thermal insulation coating from shedding, the brittle fracture of the thermal insulation board, and the collision protection of the thermal insulation board when the daily operator loads and unloads the movable and fixed mold bodies, and can prevent the operator from being scalded or having heatstroke. The thermal insulation coating, thermal insulation board, and protective plate all have corresponding gaps between the movable mold and the fixed mold of the movable and fixed mold bodies. According to the hot core process, when making sand cores, the temperature of the hot core box mold is relatively high. It is electrically heated by the heating tube and the heat is conducted to the inside of the hot core box mold, and is maintained within the specified process temperature range, forming a uniform mold temperature field, which better ensures the solidification of the sand core. In particular, the cylinder head water channel sand core has a complex structure and is a thin-walled part, which has extremely high requirements for the mold temperature field. For example, when a certain cylinder head water channel sand core is produced using an ordinary hot core process, the mold surface temperature is 210-250°C, the cavity temperature reaches 280-310°C, and the electricity consumption per shift is 168 degrees. The operator needs to endure the high temperature. After adopting the present invention, the mold surface temperature is reduced to 50-80°C, the cavity temperature is maintained at 280-300°C, and the electricity consumption per shift is 120 degrees, which greatly reduces energy loss and working environment requirements.

Claims

1. The heat-insulating and energy-saving hot box mold includes a movable and fixed mold body and a heating tube, and is characterized by: The movable and fixed mold bodies are covered with a heat-insulating coating around them, and heat-insulating plates are arranged around the movable and fixed mold bodies and on the heat-insulating coating.

2. The heat-insulating and energy-saving hot box mold according to claim 1, characterized in that: Protective plates are arranged around the movable and fixed mold bodies and on the heat insulation plates.

3. The heat-insulating and energy-saving hot box mold according to claim 2, characterized in that: A patch temperature sensor is installed between the heat insulation plate and the protection plate, and the patch temperature sensor is electrically connected to a temperature control instrument.

4. The heat-insulating and energy-saving hot box mold according to claim 2 or 3, characterized in that: The periphery of the protective plate is bent inward to cover the edges of the heat insulation board and the thermal insulation coating.

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