Pouring device for lost foam casting

Abstract

The utility model relates to the field of casting equipment, in particular to a pouring device for lost foam casting, which comprises a pouring component, a sand mould box, a preheating box and a negative pressure box, the pouring component is provided with a sprue and a cross gate, the inner wall of the sprue and the inner wall of the cross gate are respectively provided with a flow guide groove, and the flow guide grooves are communicated with the sand mould box. The head end and the tail end of the cross gate are respectively provided with a gate nest and a buffer nest; and the periphery of the sand mold box is coated with a preheating box capable of heating and preserving heat. The flow guide grooves distributed in the inner walls of the straight pouring gate and the transverse pouring gate and the pouring gate nest and the buffering nest which are distributed at the two ends of the transverse pouring gate are used for reducing the turbulent flow phenomenon of metal liquid in the pouring gate and the vortex rotation and impact turbulent flow phenomena when the metal liquid enters the transverse pouring gate, and the flowing stability of the metal liquid can be improved; the sand mold box and the evaporative pattern are preheated and insulated by the preheating box, so that the sand mold box and the evaporative pattern in the sand mold box can be prevented from collapsing or collapsing due to sudden temperature change during pouring, and the casting quality and the pouring efficiency of evaporative pattern casting can be improved.

Description

Technical Field

[0001] The utility model relates to the field of casting equipment, in particular to a pouring device for lost foam casting. Background Art

[0002] Lost foam casting, also known as vaporization mold casting, is a modern precision casting method that uses foam plastic polymer materials to make a lost foam model instead of traditional sand or metal molds for modeling. During the pouring process, the high-temperature molten metal melts the foam model and vaporizes it to form a casting. The traditional lost foam casting pouring process often has unstable molten metal flow and turbulence during the filling process, which leads to defects inside the casting; sometimes there are uneven dryness or wetness of the model or coating, and the sand mold box does not vibrate densely enough. During pouring, the sudden change in temperature causes the box to collapse or disintegrate, causing the pouring to fail, which in turn affects the casting quality, pouring efficiency or cost. In view of this, it is necessary to improve the pouring device used for lost foam casting. How to reduce turbulence and avoid sudden temperature changes during the pouring process to improve the casting quality and pouring efficiency is a problem to be solved in this case. Utility Model Content

[0003] In order to overcome the deficiencies in the prior art, the utility model discloses a pouring device for lost foam casting, including a pouring assembly, a sand mold box, a preheating box and a negative pressure box, wherein the pouring assembly is provided with a straight runner and a cross runner connected below the straight runner, guide grooves are provided on the inner walls of the straight runner and the cross runner, and a runner pocket and a buffer pocket are provided at the head and the end of the cross runner respectively; a preheating box capable of heating and heat preservation is coated on the periphery of the sand mold box. The utility model improves the pouring device for lost foam casting, wherein straight guide grooves and cross guide grooves are arranged longitudinally along the tube walls of the respective runners on the inner walls of the straight runner and the cross runner of the pouring assembly; a runner pocket is provided at the head end of the cross runner corresponding to the lower side of the straight runner, and a buffer pocket is provided at the end of the cross runner; a preheating box capable of heating and heat preservation is coated on the periphery of the sand mold box containing the lost model. The turbulence of the molten metal in the runner and the eddy current and the impact turbulence when entering the runner are reduced by using the guide grooves arranged on the inner walls of the sprue and the runner, and the runner pockets and buffer pockets arranged at both ends of the runner, thereby improving the stability of the flow of the molten metal; the sand mold box and the lost pattern are preheated and kept warm by using the preheating box, thereby avoiding the collapse or disintegration of the sand mold box and the lost pattern inside thereof due to a sudden change in temperature during pouring, thereby improving the casting quality and pouring efficiency of the lost foam casting.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A pouring device for lost foam casting comprises a sand mold box and a negative pressure box, wherein the sand mold box is placed in the negative pressure box, and is characterized in that it also comprises a pouring assembly and a preheating box, wherein the pouring assembly is provided with vertical and horizontal pouring pipes and guide grooves are provided on the inner walls of the pouring pipes, the vertical pouring pipe and the horizontal pouring pipe of the pouring assembly are mutually connected and a sunken pit is provided at the intersection of the two, and a groove extending outward is provided at the end of the horizontal pouring pipe, the pouring assembly is placed above the sand mold box and is connected to the sand mold box, the preheating box is provided with a heating and heat-insulating component, the preheating box is coated on the periphery of the sand mold box and is placed in the negative pressure box, and the preheating box can preheat and heat-insulate the sand mold box.

[0006] The pouring assembly includes a pouring cup, a straight runner, a cross runner and an ingrown runner. The pouring cup is connected to the upper mouth of the vertical straight runner. The cross runner is placed horizontally below the straight runner and is connected and fixed to the lower mouth of the straight runner. The ingrown runner is composed of several pieces, and the several pieces of ingrowns are placed on both sides of the cross runner and are all connected to the cross runner.

[0007] The sprue is an upright conical circular tubular body, the diameter of its upper end is larger than the diameter of its lower end, a plurality of straight guide grooves are evenly distributed on the inner wall of the sprue, the straight guide grooves are longitudinally arranged along the tube wall of the sprue, and a connection port for inserting and connecting a pouring cup is provided at the upper mouth of the sprue. The lower part of the sprue is placed in a negative pressure box, and the upper part is exposed.

[0008] The cross runner is a horizontally placed square tubular body, and is inclined with one end high and the other end low. The high end is set as the head end, and the low end is set as the tail end. A downwardly recessed pit-shaped runner socket is provided at the head end, and a semi-arc-shaped buffer socket extending outward is provided at the tail end. The cross runner is provided with a plurality of transverse guide grooves on its inner wall, and the transverse guide grooves are arranged longitudinally along the tube wall of the cross runner.

[0009] The sprue is placed above the sprue cavity of the horizontal sprue, and its lower end is inserted into and fixedly connected to the through hole provided in the horizontal sprue.

[0010] The ingates are bent round tubes, the upper ends of several ingates are fixedly connected to the round holes arranged on both sides of the cross runner and communicated with the cross runner, and the lower ends of the ingates are inserted into the sand mold box.

[0011] The preheating box is a box-shaped body surrounded by side walls and a bottom wall and open upward. Electric heating components are embedded in the side walls and bottom walls, and insulation layers are applied on the outer surfaces of the side walls and bottom walls. The preheating box is tightly sleeved on the outer wall of the sand mold box.

[0012] The lost foam model can be embedded in the sand mold box.

[0013] The negative pressure box is connected to an external negative pressure pump.

[0014] From the above description, it can be seen that the advantages of the pouring device for lost foam casting provided by the utility model are: first, straight guide grooves and horizontal guide grooves are arranged on the inner walls of the straight runner and the cross runner of the pouring component respectively along the longitudinal direction of the tube wall of each runner; a runner nest is provided at the head end of the cross runner corresponding to the lower part of the straight runner, and a buffer nest is provided at the end of the cross runner. The guide grooves arranged on the inner walls of the straight runner and the cross runner and the runner nests and buffer nests arranged at both ends of the cross runner are used to reduce the turbulent flow of the metal liquid in the runner and the eddy current swirl and impact turbulence when entering the cross runner, which can improve the stability of the metal liquid flow and make it difficult to interrupt the flow during pouring, thereby reducing the risk of pores and cracks in the casting; second, a preheating box that can be heated and insulated is coated on the periphery of the sand mold box equipped with the lost model. The preheating box is used to preheat and insulate the sand mold box and the lost model, which can avoid the sand mold box and the lost model inside The sudden change in temperature during pouring causes the box to collapse or disintegrate. The utility model can improve the casting quality and casting efficiency of lost foam casting by improving the casting device used for lost foam casting. The utility model has reasonable design, simple structure, low cost and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a general schematic diagram of a pouring device for lost foam casting according to the utility model;

[0016] Figure 2 is an enlarged schematic diagram of the casting assembly;

[0017] Figure 3 It is an enlarged schematic diagram of the sprue;

[0018] Figure 4 for Figure 3 AA enlarged schematic diagram in;

[0019] Figure 5 It is an enlarged schematic diagram of the runner;

[0020] Figure 6 for Figure 5 BB enlarged schematic diagram in;

[0021] Figure 7 This is an enlarged schematic diagram of the preheating box.

[0022] Reference numerals:

[0023] 1 pouring assembly; 11 pouring cup; 12 straight runner; 121 straight guide groove; 122 connecting port; 13 horizontal runner; 131 horizontal guide groove; 132 runner nest; 133 buffer nest; 14 inner runner; 2 sand mold box; 3 preheating box; 4 negative pressure box. DETAILED DESCRIPTION

[0024] The present invention is further described below through specific implementation methods.

[0025] like Figure 1 As shown, a pouring device for lost foam casting described in the utility model comprises a pouring assembly 1, a sand mold box 2, a preheating box 3 and a negative pressure box 4, wherein the pouring assembly 1 is provided with vertical and horizontal pouring pipes and guide grooves are provided on the inner walls of the pouring pipes, the vertical pouring pipe and the horizontal pouring pipe of the pouring assembly 1 are interconnected and a sunken pit is provided at the intersection of the two, and a groove extending outward is provided at the end of the horizontal pouring pipe, the pouring assembly 1 is placed above the sand mold box 2 and is connected to the sand mold box 2, the preheating box 3 is provided with a heating and heat-insulating component, the preheating box 3 is coated on the periphery of the sand mold box 2 and is placed in the negative pressure box 4, and the preheating box 3 can preheat and keep the sand mold box 2 warm.

[0026] like Figure 1 and Figure 2 As shown, the pouring assembly 1 described in the utility model includes a pouring cup 11, a sprue 12, a runner 13 and an ingode 14, the pouring cup 11 is connected to the upper mouth of the vertical sprue 12, the runner 13 is horizontally placed below the sprue 12 and is connected and fixedly connected to the lower mouth of the sprue 12, the ingode 14 is composed of a plurality of pieces, the ingode 14 is a bent circular tube, the upper ends of the plurality of ingodes 14 are fixedly connected to the circular holes provided on both sides of the runner 13 and are connected to the runner 13, and the lower end of the ingode 14 is inserted into the sand mold box 2.

[0027] like Figures 1 to 6 As shown, the sprue 12 described in the utility model is a vertical conical circular tubular body, the diameter of its upper end is larger than the diameter of its lower end, a plurality of straight guide grooves 121 are evenly distributed on the inner wall of the sprue 12, the straight guide grooves 121 are longitudinally arranged along the tube wall of the sprue 12, and a connecting port 122 for inserting and connecting the pouring cup 11 is provided at the upper mouth of the sprue 12, the lower part of the sprue 12 is placed in the negative pressure box 4, and the upper part thereof is exposed. The runner 13 is a horizontally placed square tubular body, and is inclined with one end high and the other end low. The high end is set as the head end, and the low end is set as the tail end. A downwardly recessed runner cavity 132 is provided at the head end, and a semi-arc-shaped buffer cavity 133 extending outward is provided at the tail end. The runner 13 is provided with a plurality of transverse guide grooves 131 on its inner wall, and the transverse guide grooves 131 are arranged longitudinally along the tube wall of the runner 13. The sprue 12 is placed above the runner cavity 132 of the runner 13, and its lower end is inserted into and fixedly connected to the through hole provided in the runner 13.

[0028] like Figure 1 and Figure 7As shown, the preheating box 3 described in the utility model is a box-shaped body surrounded by side walls and a bottom wall, with an open top. Electric heating components are embedded inside the side walls and the bottom wall, and insulation layers are applied on the outer surfaces of the side walls and the bottom wall. The preheating box 3 is tightly sleeved on the outer wall of the sand mold box 2. The electric heating components and the insulation layer are both well-known technologies. The lost foam model can be embedded in the sand mold box 2, and the negative pressure box 4 is connected to an external negative pressure pump.

[0029] Before the pouring device for lost foam casting is prepared for pouring, the electric heating component in the preheating box 3 can be turned on to preheat and keep the sand mold box 2 and the lost pattern warm. The temperature of the sand mold box 2 and the lost pattern can be slowly preheated and then the metal liquid can be poured, so as to avoid the adverse effect of the sudden change of high temperature during pouring on the sand mold box 2 and the lost pattern.

[0030] The utility model improves the pouring device for lost foam casting, and on the inner walls of the sprue 12 and the cross runner 13 of the pouring component 1, a straight guide groove 121 and a cross guide groove 131 are respectively arranged along the longitudinal direction of the tube wall of each runner; a runner nest 132 is provided at the head end of the cross runner 13 corresponding to the lower part of the straight runner 12, and a buffer nest 133 is provided at the end of the cross runner 13; and a preheating box 3 that can be heated and kept warm is coated on the periphery of a sand mold box 2 containing a lost foam model. The guide grooves arranged on the inner walls of the straight runner 12 and the cross runner 13 and the runner pockets 132 and the buffer pockets 133 arranged at both ends of the cross runner 13 are used to reduce the turbulence of the metal liquid in the runner and the eddy current swirl and impact turbulence when entering the cross runner 13, thereby improving the stability of the metal liquid flow; the preheating box 3 is used to preheat and keep the sand mold box 2 and the lost pattern inside the sand mold box 2 warm, so as to avoid the sand mold box 2 and the lost pattern inside the sand mold box 2 from collapsing or disintegrating due to a sudden change in temperature during pouring, thereby improving the casting quality and pouring efficiency of the lost foam casting.

[0031] The above is only a specific embodiment of the present utility model, but the design concept of the present utility model is not limited to this. Any non-substantial changes to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A pouring device for lost foam casting, comprising a sand mold box (2) and a negative pressure box (4), wherein the sand mold box (2) is placed in the negative pressure box (4), characterized in that: The invention also comprises a pouring assembly (1) and a preheating box (3). The pouring assembly (1) is provided with vertical and horizontal pouring pipes and the inner walls of the pouring pipes are provided with flow guide grooves. The vertical pouring pipe and the horizontal pouring pipe of the pouring assembly (1) are mutually connected and a sunken pit is provided at the intersection of the two. A groove extending outward is provided at the end of the horizontal pouring pipe. The pouring assembly (1) is placed above the sand mold box (2) and is connected to the sand mold box (2). The preheating box (3) is provided with a heating and heat-insulating component. The preheating box (3) is coated on the outer periphery of the sand mold box (2) and is placed in the negative pressure box (4). The preheating box (3) can preheat and heat-insulate the sand mold box (2).

2. A pouring device for lost foam casting according to claim 1, characterized in that: The pouring assembly (1) comprises a pouring cup (11), a sprue (12), a runner (13) and an entrapment (14); the pouring cup (11) is connected to the upper opening of the vertical sprue (12); the runner (13) is horizontally placed below the sprue (12) and is connected and fixedly connected to the lower opening of the sprue (12); the entrapment (14) comprises a plurality of pieces, and the plurality of entrapments (14) are placed on both sides of the runner (13) and are all connected to the runner (13).

3. A pouring device for lost foam casting according to claim 2, characterized in that: The sprue (12) is a vertical conical circular tubular body, the diameter of its upper end is larger than the diameter of its lower end, a plurality of straight guide grooves (121) are evenly arranged on the inner wall of the sprue (12), the straight guide grooves (121) are arranged longitudinally along the tube wall of the sprue (12), and a connecting port (122) for inserting and connecting a pouring cup (11) is provided at the upper opening of the sprue (12), the lower part of the sprue (12) is placed in the negative pressure box (4), and the upper part thereof is exposed.

4. A pouring device for lost foam casting according to claim 3, characterized in that: The cross runner (13) is a horizontally placed square tubular body. The cross runner (13) is inclined with one end high and the other end low. The high end is set as the head end and the low end is set as the tail end. A downwardly recessed runner pocket (132) is provided at the head end, and a semi-arc-shaped buffer pocket (133) extending outward is provided at the tail end. The cross runner (13) is provided with a plurality of transverse guide grooves (131) on its inner wall. The transverse guide grooves (131) are arranged longitudinally along the tube wall of the cross runner (13).

5. A pouring device for lost foam casting according to claim 4, characterized in that: The sprue (12) is placed above the sprue cavity (132) of the runner (13), and its lower end is inserted into and fixedly connected to a through hole provided in the runner (13).

6. A pouring device for lost foam casting according to claim 5, characterized in that: The ingates (14) are bent round tubes. The upper ends of several ingates (14) are fixedly connected to the round holes provided on both sides of the runner (13) and are connected to the runner (13). The lower ends of the ingates (14) are inserted into the sand mold box (2).

7. A pouring device for lost foam casting according to claim 6, characterized in that: The preheating box (3) is a box-shaped body surrounded by side walls and a bottom wall and open upward. Electric heating components are embedded in the side walls and the bottom wall, and the outer surfaces of the side walls and the bottom wall are coated with a heat-insulating layer. The preheating box (3) is tightly sleeved on the outer wall of the sand mold box (2).

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