Box type sand core type pouring system

Abstract

The invention relates to a box type sand core type pouring system which comprises a sand box, a pouring system and a sand core box, and the pouring system comprises a first mold, a plurality of second molds, a cavity and a sprue; after sand is put into the sand core box to be solidified, the sand box is opened, and the first mold and the second mold are pulled out, so that channels, left on the sand box and the sand core box, of the first mold and the second mold form a transverse pouring gate and an inner pouring gate respectively; enabling the molten iron to sequentially pass through a straight pouring gate, an inner pouring gate and a transverse pouring gate to enter a cavity, and completing the molding of a casting; by optimizing the design of the pouring channel, uniform distribution of molten metal is achieved, the defects, such as air holes and shrinkage porosity, in a casting are reduced, and the overall quality of the casting is improved. By optimizing the design of the pouring channel, the hardness deviation of the plate surface is obviously reduced to be at least HB10, the sand inclusion and falling defects of the plate surface are eliminated, the use of consumables such as a ceramic tube, a rubber bottom and tube sticking glue is reduced, the production cost is greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of casting system technology, specifically a box-type sand core casting system. Background Technology

[0003] In the traditional injection molding process, the bottom pouring method is often used, with a large number of ceramic tubes connecting the sprue, gating system and ingate.

[0004] This method is not only expensive, but also requires the use of adhesive glue, tape and other consumables during the connection process, which increases production costs and the workload of workers. At the same time, although waste resin sand can be recycled and remanufactured, a large number of broken ceramic pipes cannot be remanufactured and need to be recycled and disposed of in an environmentally friendly manner.

[0005] Therefore, the development of an environmentally friendly and economical casting system has become an urgent need in the industry. To address the above issues, a box-type sand core casting system is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a box-type sand core casting system.

[0007] The objective of this invention is achieved through the following technical solution: a sand box and a pouring system, and a sand core box, wherein the sand box is used to stably support the pouring system; The casting system includes a first mold placed into a sand box and passing through a sand core box. The outer side of the sand core box is provided with a plurality of second molds that are installed and connected to the first mold. The sand box has a cavity for forming the casting. The second molds pass through the sand core box and enter the cavity. After the sand is poured into the sand core box and solidified, the sand box is opened, and the first and second molds are pulled out using external mold-pulling tools, so that the channels left by the first and second molds on the sand box and the sand core box respectively form the horizontal runner and the inner runner. The sand box is provided with a sprue that communicates with the ingate; the molten iron enters the mold cavity in sequence through the sprue, ingate and gating, to complete the casting; wherein, the gating is equivalent to a traditional 60 ceramic tube and the ingate is equivalent to the ingate of a traditional 30 ceramic tube.

[0008] As a further description of the above technical solution: the sand core box is a square structure with a draft angle, which facilitates the smooth removal of the sand core box from the sand box; and the draft angle is controlled between 1° and 5° to facilitate demolding; the corners of the sand core box are set with rounded transition shapes to prevent stress concentration.

[0009] As a further description of the above technical solution: the sand box is divided into an upper sand box and a lower sand box, and the horizontal sprue is located in the lower sand box to ensure that the molten iron can flow smoothly into the cavity; it facilitates the layout and operation of the gating system; during the mold closing and opening process, the upper sand box and the lower sand box are connected by a positioning mechanism, and the upper sand box and the lower sand box are connected by a hydraulic device for mold closing and opening operations.

[0010] As a further description of the above technical solution: there are two first molds, which are interlocked with each other to enhance the stability and reliability of the molds. They are interlocked with each other through dovetail grooves and high-temperature resistant dovetail blocks. The two first molds are L-shaped and their ends press against each other. The joint between the two first molds is bonded by a heat insulation layer.

[0011] As a further description of the above technical solution: the ingate can be divided into a vertical ingate and a horizontal ingate; the horizontal ingate is used for castings in which molten iron is poured horizontally, and the length of the horizontal ingate is set to 1.5-2 times the width of the casting; the vertical ingate is used for castings in which molten iron is poured vertically, and the height of the vertical ingate is set to 1 / 3-1 / 2 of the height of the casting, which can be adjusted according to actual needs, further improving the flexibility and adaptability of pouring.

[0012] As a further description of the above technical solution: the sand core box is integrally formed with the sand mold, eliminating the need for external ceramic tube connection; this improves the sealing performance and reliability of the casting system.

[0013] As a further description of the above technical solution: it also includes a cover plate sand core panel located inside the sand core box. The cover plate sand core panel is a fixed-size structure used to cover the sand core box when the upper sand box and the lower sand box are closed; it prevents sand leakage and fire from occurring; before closing the mold, the cover plate sand core panel is accurately placed between the sand core boxes through the positioning structure. When closing the mold, the cover plate sand core panel is tightly attached to the sand core box to form a complete inner cavity sealing structure.

[0014] As a further description of the above technical solution: the top of the sprue is provided with a pouring cup, which is funnel-shaped. The inner surface of the pouring cup is smoothed and has a liquid level mark. The molten iron enters the sprue through the pouring cup, controlling the inflow rate and speed of the molten iron. The second mold has multiple side inlets, and circular reinforcing ribs are provided around the side inlets. The circular reinforcing ribs are embedded inside the second mold. A filter structure can be provided inside the side inlets according to the actual situation.

[0015] Compared with the prior art, the advantages of the present invention are as follows: 1. This box-type sand core casting system optimizes the design of the casting channel, allowing molten metal (1500°C molten iron) to flow smoothly into the mold cavity during the casting process, avoiding eddies and inclusions. At the same time, the number and position of the vertical ingate can be adjusted according to actual needs, further improving the flexibility and adaptability of casting. The cover plate sand core panel is a fixed-size structure used to cover the upper and lower sand mold boxes when the mold is closed, ensuring the sealing of the casting process.

[0016] 2. This application significantly reduces the surface hardness deviation of the plate to at least HB10 by optimizing the design of the pouring channel, thus eliminating the defects of sand inclusion and sand shedding on the plate surface. 3. This application significantly reduces production costs and improves production efficiency by reducing the use of consumables such as ceramic tubes, adhesive bases, and tube adhesive.

[0017] 4. This application is applied to the casting of injection molding machine plates. By optimizing thermal balance control, unnecessary stress is avoided, thereby improving the quality of castings. Attached Figure Description

[0019] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the horizontal gating system, the inner gating system, and the sand core box of the present invention. Figure 3 This is a schematic diagram of the combined structure of the first mold and the second mold of the present invention.

[0020] Labeling Explanation: 1. Sand box; 101. Upper sand box; 102. Lower sand box; 2. First mold; 3. Second mold; 4. Cavity; 5. Sand core box; 6. Horizontal runner; 7. Inner runner; 8. Straight runner; 9. Cover plate sand core panel; 10. Pour cup; 11. Side pouring port. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments: like Figure 1 and Figure 3 The diagram shown is an embodiment of the box-type sand core casting system provided by the present invention, including: a sand box 1, a casting system, and a sand core box 5, wherein the sand box 1 is used to stably support the casting system; The casting system includes a first mold 2 that is placed into the sand box 1 and passes through the sand core box 5. The outer side of the sand core box 5 is provided with a plurality of second molds 3 that are installed and connected to the first mold 2. The sand box 1 has a cavity 4 for forming castings. The second molds 3 pass through the sand core box 5 and enter the cavity 4. After the sand is released into the sand core box 5 to solidify, the sand box 1 is opened, and the first mold 2 and the second mold 3 are pulled out using external mold-pulling tools, so that the channels left by the first mold 2 and the second mold 3 on the sand box 1 and the sand core box respectively form the horizontal runner 6 and the inner runner 7. The sand box 1 is provided with a straight sprue 8 that communicates with the inner sprue 7; The molten iron is sequentially fed into the mold cavity 4 through the sprue 8, the ingate 7, and the gating 6 to complete the casting process. During casting, the molten metal flows into the ingate 7 and the gating 6 through the sprue 8, and is then evenly distributed into the mold cavity 4 to complete the filling of the casting. This application achieves uniform distribution of molten metal by optimizing the gating channel design, reducing internal defects in the casting, such as porosity and shrinkage, and improving the overall quality of the casting.

[0023] The sand core box 5 is a square structure with a draft angle controlled between 1° and 5°. The corners of the sand core box 5 are designed with rounded transition shapes to prevent stress concentration. During the mold closing and opening process, the draft angle design allows the sand core box 5 to be smoothly removed from the casting, avoiding surface damage to the casting caused by friction. This design improves the surface finish and dimensional accuracy of the casting, reduces the workload of subsequent processing, and lowers production costs.

[0024] The sand box 1 is divided into an upper sand box 101 and a lower sand box 102. During the mold closing and opening process, the upper sand box 101 and the lower sand box 102 are connected by a positioning mechanism. The positioning mechanism can be a conventional combination of pins and holes. The horizontal sprue 6 is located in the lower sand box 102 to ensure that the molten iron can flow smoothly into the cavity 4. Setting the horizontal sprue 6 in the lower sand box 102 facilitates the layout and operation of the gating system, and at the same time, it is conducive to the smooth flow of molten metal, reduces resistance during the pouring process, and improves pouring efficiency. The upper sand box 101 and the lower sand box 102 are connected by a hydraulic device for mold closing and opening operations, thereby ensuring the stability of mold closing and opening.

[0025] There are two first molds 2, which are interlocked with each other. They can be interlocked with each other through dovetail grooves and high-temperature resistant dovetail blocks, which enhances the stability and reliability between the molds. They are not easily deformed or displaced during the casting process, thus ensuring the dimensional accuracy and surface quality of the castings. The two first molds 2 are L-shaped and their ends press against each other. The joint between the two first molds 2 is bonded by a heat insulation layer to ensure sealing and avoid impact on the joint, thereby increasing stability.

[0026] The ingate 7 can be divided into vertical ingate and horizontal ingate. The horizontal ingate is used for castings in which molten iron is poured horizontally. The length of the horizontal ingate is set to 1.5-2 times the width of the casting. The vertical ingate is used for castings in which molten iron is poured vertically. The height of the vertical ingate is set to 1 / 3-1 / 2 of the height of the casting. The number and position of the ingate 7 can be adjusted according to actual needs, further improving the flexibility and adaptability of the pouring process.

[0027] The sand core box 5 is integrally formed with the sand mold, eliminating the need for external ceramic tube connections. This integral forming of the sand core box 5 with the sand mold avoids the use of external ceramic tube connections, reduces the use of consumables and the workload during the connection process, lowers production costs, and at the same time improves the sealing and reliability of the casting system.

[0028] It also includes a cover sand core panel 9 located inside the sand core box 5. The cover sand core panel 9 is a fixed-size structure used to cover the sand core box 5 when the upper sand box 101 and the lower sand box 102 are closed. The cover sand core panel is a fixed-size structure (e.g., 50cm high and 100cm wide). The use of the cover sand core panel 9 ensures the sealing of the pouring process and prevents sand leakage and fire from occurring. Before mold closing, the cover plate sand core panel 9 is accurately placed between the sand core boxes 5 through the positioning structure. When the mold is closed, the cover plate sand core panel 9 fits tightly against the sand core box 5 to form a complete inner cavity sealing structure. Before mold closing, the cover plate sand core panel 9 is placed between the sand core boxes 5; when the mold is closed, the cover plate sand core panel 9 fits tightly against the sand core box 5 to form a complete inner cavity sealing structure. This setting enhances the sealing of the inner cavity and prevents leakage and splashing of molten metal during the pouring process; while the fixed size design facilitates standardized production and inventory management, and reduces production costs.

[0029] The top of the sprue 8 is provided with a pouring cup 10. Molten iron enters the sprue 8 through the pouring cup 10. The pouring cup 10 is funnel-shaped. The inner surface of the pouring cup 10 is smoothed and is provided with liquid level marks (to facilitate control of the feed amount). The setting of the pouring cup 10 facilitates the control of the inflow amount and inflow speed of molten iron, making the pouring process more stable and controllable, and improving the accuracy of pouring and the quality of castings.

[0030] This box-type sand core casting system optimizes the design of the casting channel, allowing molten metal to flow smoothly into the mold cavity during the casting process, avoiding eddies and inclusions.

[0031] It is worth noting that: Small pipes can be configured to pour molten iron through the horizontal runner 6, the ingate 7, and the sprue 8. The resin sand-molded runner cavity can be used for molten iron pouring, functioning similarly to traditional ceramic pipes. However, it can form multiple side-outlet side-pouring ports 11, as shown in the figure, corresponding to six side-pouring ports 11. These ports can be inserted into the casting surface, allowing the output end of the small pipe to directly disperse and deliver the poured molten iron to different locations on the casting. This avoids stress concentration caused by passing through a single pipe, which could affect casting performance. Furthermore, it can balance the hardness distribution of the casting, effectively improving casting quality and machinability. This makes the hardness of all parts more uniform, significantly reduces the use of ceramic pipes, effectively lowers production costs, and meets national environmental protection requirements.

[0032] It is worth noting that a circular reinforcing rib structure is provided around the side injection port 11. The circular reinforcing rib structure is embedded inside the second mold 3, which helps to ensure the strength of the side injection port 11 and ensure the casting quality.

Claims

1. Boxed sand core mold gating system, characterized in that, The application relates to a sand box (1) and a pouring system and a sand core box (5), wherein the sand box (1) is used for stably supporting the pouring system; the pouring system comprises a first mold (2) arranged into the sand box (1) and penetrating through the sand core box (5), a plurality of second molds (3) arranged outside the sand core box (5) and connected with the first mold (2), and a cavity (4) arranged in the sand box (1) and used for forming a casting; the second mold (3) penetrates through the sand core box (5) and enters the cavity (4); after sand is poured into the sand core box (5) and solidified, the sand box (1) is opened, and the first mold (2) and the second mold (3) are pulled out by using external pulling tools, so that the channels left by the first mold (2) and the second mold (3) on the sand box (1) and the sand core box form a horizontal gate (6) and an inner gate (7); a straight gate (8) is arranged on the sand box (1) and communicated with the inner gate (7); iron liquid sequentially passes through the straight gate (8), the inner gate (7) and the horizontal gate (6) and enters the cavity (4), so that the forming of the casting is completed. The sand core box (5) is a square structure with a mold pulling slope, the mold pulling slope is controlled to be 1-5 degrees, and the corners of the sand core box (5) are provided with a round corner transition shape for preventing stress concentration. The sand box (1) is divided into an upper sand box (101) and a lower sand box (102), the upper sand box (101) and the lower sand box (102) are connected through a positioning mechanism during mold closing and mold opening, the horizontal gate (6) is arranged in the lower sand box (102), and the iron liquid can smoothly flow into the cavity (4); The upper sand box (101) and the lower sand box (102) are connected through a hydraulic device for mold closing and mold opening. The first mold (2) is two, the two first molds (2) are connected through dovetail grooves and high-temperature-resistant dovetail blocks. The inner gate (7) can be divided into a vertical inner gate and a horizontal inner gate, the horizontal inner gate is used for horizontally injecting the iron liquid into the casting, the length of the horizontal inner gate is 1.5-2 times the width of the casting, the vertical inner gate is used for vertically injecting the iron liquid into the casting, and the height of the vertical inner gate is 1 / 3-1 / 2 the height of the casting.

2. The box core type gating system according to claim 1, characterized in that: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

3. The box core type gating system of claim 1, wherein: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

4. The box core type gating system according to claim 3, characterized in that: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

5. The box core type pouring system of claim 1, wherein: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

6. The box core type pouring system of claim 1, wherein: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

7. The box core type pouring system of claim 2, wherein: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed.

8. The box core type pouring system of claim 1, wherein: The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. The sand core box (5) is integrally formed with the sand mold, and external ceramic pipes are not needed. 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The box core type pouring system of claim 1, wherein: The second mold (3) is provided with a plurality of side injection ports (11), and a circular reinforcing rib structure is arranged around the side injection port (11), and the circular reinforcing rib structure is embedded in the second mold (3).

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