Wooden mold for ramming and casting coins in molding sand

Abstract

The utility model discloses a molding sand ramming and coin casting wooden mold which comprises two molding sand boxes, the two molding sand boxes are arranged up and down, pouring holes corresponding to each other are formed in the two molding sand boxes, and each molding sand box comprises two main wood board side fences and two auxiliary wood board side fences. The two main wood board side fences and the two auxiliary wood board side fences form a frame-shaped frame body, the periphery of the frame-shaped frame body is fixedly connected through corner fixing pieces, and corner positioning pieces corresponding to the lower molding sand box in an inserted connection mode are arranged at the opposite corners of the upper molding sand box. The molding sand box has the beneficial effects that the molding sand box is formed by machining the main wood board side fence and the auxiliary wood board side fence, the manufacturing cost is low, the pressure of molding sand can be borne, and the molding sand box is very suitable for small-scale production; and the die is easy to process and adjust, suitable for manufacturing complex dies and high in practicability.

Description

Technical Field

[0001] The utility model relates to the field of ramming casting of molding sand, in particular to a ramming casting coin wooden mold for molding sand. Background Art

[0002] The sand box plays an important role in the process of ramming casting of molding sand. It is a container for holding molding sand and making sand molds. Its main function is to provide a stable framework so that the molding sand can be rammed evenly to form a solid mold. In the sand box, the molding sand is in close contact with the master coin to ensure that the metal can accurately replicate the shape of the master coin during casting. The design of the sand box usually takes into account the size, shape of the mold and casting requirements to ensure the accuracy and quality of the casting. Using a sand box can effectively control the density of the molding sand, thereby improving the fineness and consistency of the casting.

[0003] At present, the service life of the coin mold for sand casting is directly related to the entire production quality and economic benefits. In addition to using wood to make molds, people have also developed other materials to make molds, such as metal molds, semi-metal molds, epoxy resin fiberglass molds, polystyrene foam plastic molds, etc. However, the cost of these materials is relatively high, and the iron material is prone to deformation due to the influence of thermal expansion, which is likely to cause errors in the internal formed coins; under extreme temperature or humidity conditions, the fiberglass may exhibit certain brittleness or aging phenomena, but the existing wooden molds are not easy to perform positioning operations.

[0004] Therefore, providing a ramming casting coin wooden mold is already a problem worthy of research. Content of the Utility Model

[0005] In order to solve the deficiencies existing in the above-mentioned prior art, the purpose of the utility model is to have a relatively low production cost, be able to withstand the pressure of the molding sand, and be very suitable for small-scale production.

[0006] The purpose of the utility model is achieved as follows:

[0007] The ramming casting coin wooden mold provided by the utility model includes two sand boxes, the two sand boxes are arranged up and down, and corresponding casting holes are provided on the two sand boxes. The sand box includes two main wooden board side bars and two auxiliary wooden board side bars. The two main wooden board side bars and the two auxiliary wooden board side bars form a frame-shaped body, and the four sides of this frame-shaped body are fixedly connected through corner fixing parts. Corner positioning parts corresponding to the insertion of the lower sand box are arranged diagonally on the upper sand box.

[0008] Further explanation is that the inner walls of the auxiliary wooden board side bars on the same sand box are symmetrically inclined. The similar surfaces of the two trapezoids formed by the upper and lower sand boxes are large end faces, and length positioning grooves corresponding to the insertion of the main wooden board side bars are provided at both ends of the auxiliary wooden board side bars.

[0009] Further explanation: The corner fixing part is an angle iron, and the corner fixing part is fixedly connected to the side rail of the main wooden board and the side rail of the auxiliary wooden board through high-strength screws.

[0010] Further explanation: The corner fixing part includes a nut seat fixedly connected to the side of the side rail of the main wooden board. A fixing bolt is threadedly connected inside the nut seat. A positioning block is arranged outside the fixing bolt. A bolt groove corresponding to the fixing bolt and a limiting blind groove corresponding to the insertion of the positioning block are arranged on the side rail of the auxiliary wooden board.

[0011] Further explanation: The bolt groove penetrates through the length side wall of the side rail of the auxiliary wooden board.

[0012] Further explanation: Manipulation handles are arranged on the outer sides of the upper and lower sand mold boxes.

[0013] Further explanation: The corner positioning part is an angle iron, which is fixedly installed at the diagonal position of the sand mold box.

[0014] Further explanation: The corner positioning part includes a column slidably connected to the outer side of the side rail of the main wooden board or the side rail of the auxiliary wooden board. A limiting part is arranged at the movable end of the column, and the limiting part is in a corner structure.

[0015] Positive and beneficial effects:

[0016] The sand mold box in this device is formed by processing the side rail of the main wooden board and the side rail of the auxiliary wooden board, with a relatively low production cost. It can be quickly positioned through corner positioning, and can withstand the pressure of the molding sand, which is very suitable for small-scale production;

[0017] For short-term or small-batch production, the materials of this device are easy to process, so it can be quickly manufactured and replaced without investing a large amount of resources, and it has strong practicability;

[0018] In the preferred embodiment, the fixing or disassembly of the corner positions of the side rail of the main wooden board and the side rail of the auxiliary wooden board can be realized by screwing the fixing bolt. The operation is simple and flexible, so that when one side of the side rail of the main wooden board or the side rail of the auxiliary wooden board is damaged, the replacement operation can be carried out, improving the utilization efficiency of the parts and being more economical;

[0019] The limiting of the sand mold box is realized by driving the limiting part to move up and down by the column. The operation is more flexible, and when the molding sand is filled, the operation surface can be made more flat and convenient, providing convenience for the operation. Brief Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of the present utility model;

[0021] Figure 2Schematic diagram of the inner wall of the side rail of the auxiliary wooden board being inclined in the present utility model;

[0022] Figure 3 In the present utility model Figure 2 Schematic diagram of the side rail of the auxiliary wooden board;

[0023] Figure 4 Schematic diagram of the second embodiment in the present utility model;

[0024] Figure 5 In the present utility model Figure 4 Schematic diagram of the side rail of the auxiliary wooden board;

[0025] Figure 6 In the present utility model Figure 4 Enlarged schematic diagram of the structure of the corner fixing part;

[0026] Figure 7 In the present utility model Figure 4 Enlarged schematic diagram of the structure of the corner positioning part;

[0027] In the figure: molding sand box 1, main wooden board side rail 101, auxiliary wooden board side rail 102, length positioning groove 102a, bolt groove 102b, limiting blind groove 102c, pouring hole 103, corner fixing part 2, nut seat 201, fixing bolt 202, positioning block 203, corner positioning part 3, column 301, limiting part 302, hand grip 4; Specific embodiments

[0028] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0029] First embodiment:

[0030] Referring to Figures 1-7 As shown, the molding sand ramming and casting coin wooden mold provided by the present utility model includes two molding sand boxes 1, the two molding sand boxes 1 are arranged up and down, and the two molding sand boxes 1 are provided with corresponding pouring holes 103, and the pouring holes 103 can be used to assist in pouring liquid;

[0031] The sand mold box 1 includes two main wooden side rails 101 and two secondary wooden side rails 102. The two main wooden side rails 101 and the two secondary wooden side rails 102 form a frame-shaped body. The four sides of this frame-shaped body are fixedly connected through corner fixing parts 2. At the diagonals of the upper sand mold box 1, there are corner positioning parts 3 corresponding to the insertion of the lower sand mold box 1. When the device is in use, the corner positioning parts 3 can limit the positions of the corners of the upper and lower sand mold boxes 1, realizing the rapid positioning of the upper and lower sand mold boxes 1. When installing, the corner fixing parts 2 are angle irons. The corner fixing parts 2 are connected and fixed to the main wooden side rails 101 and the secondary wooden side rails 102 through high-strength screws, and can cooperate with staples to reinforce the connection positions of the main wooden side rails 101 and the secondary wooden side rails 102, thus realizing the rapid connection of the main wooden side rails 101 and the secondary wooden side rails 102. In addition, handholds 4 are provided on the outer sides of the upper and lower sand mold boxes 1. Using the handholds 4 makes it convenient to lift the sand mold box 1 for moving and placing, providing convenience for the handling of the device;

[0032] The sand mold box 1 in this device is processed and formed by the main wooden side rails 101 and the secondary wooden side rails 102, with a relatively low production cost, and can withstand the pressure of the molding sand, being very suitable for small-scale production; and it is easy to process and adjust, suitable for making complex molds, and the sand mold box 1 made of wood materials can be quickly adjusted and replaced according to different casting requirements, with strong practicability.

[0033] When the device is specifically in use, it is necessary to fill the lower sand mold box 1 with molding sand, and then tamp and level it. On the processing plane, a sprue mold is set according to the position of the pouring hole 103. The mother coins are placed on both sides of the sprue mold in a staggered manner, and a release agent such as plant ash or lime powder is sprinkled, and then the mold is poured. In this way, multiple sets of molds of the lower sand mold box 1 and the upper sand mold box 1 are processed in sequence. And a side sprue is set at the position corresponding to the sprue using a thin scraper. The upper sand mold box 1 and the lower sand mold box 1 are spliced and aligned. The molten metal is injected into the sprue through the pouring hole 103 to ensure that the metal completely covers the mother coins and fills the mold. After waiting for the metal to completely cool in the molding sand, the upper and lower sand mold boxes 1 and the molding sand are removed, the cast coins are taken out, the molding sand residues on the coins are removed, and necessary trimming and polishing are carried out to realize the casting process of the coins.

[0034] The second embodiment is different from the first embodiment in the following features:

[0035] The inner walls of the auxiliary wooden board side rails 102 located on the same molding sand box 1 are symmetrically inclined. The inner walls of the upper and lower molding sand boxes 1 are both trapezoidal structures, and the surfaces of the two trapezoids that are close to each other are large end faces. That is, in the trapezoidal cavity of the lower molding sand box 1, the large end face faces upward, and in the trapezoidal cavity of the upper molding sand box 1, the large end face faces downward. With this setting, during the casting process, the amount of molding sand used can be reduced, and at the same time, the trapezoidal inclined surface can better support the molding sand. The two ends of the auxiliary wooden board side rail 102 are provided with length positioning grooves 102a corresponding to the insertion of the main wooden board side rail 101. When connecting the auxiliary wooden board side rail 102 and the main wooden board side rail 101, the clamping setting of the main wooden board side rail 101 can be realized through the limit of the length positioning groove 102a at the end of the main wooden board side rail 101;

[0036] Furthermore, the corner fixing part 2 includes a nut seat 201 fixedly connected to the side of the main wooden board side rail 101. A fixing bolt 202 is threadedly connected inside the nut seat 201. A positioning block 203 is provided outside the fixing bolt 202. The auxiliary wooden board side rail 102 is provided with a bolt groove 102b corresponding to the fixing bolt 202 and a limiting blind groove 102c corresponding to the insertion of the positioning block 203. The main wooden board side rail 101 is clamped on the length positioning groove 102a, the positioning block 203 is inserted into the limiting blind groove 102c, the inner end of the fixing bolt 202 penetrates through the bolt groove 102b and is threadedly connected to the nut seat 201. The positioning block 203 is pressed tightly in the limiting blind groove 102c through the end cap of the fixing bolt 202, thereby forming the connection reinforcement of the main wooden board side rail 101 and the auxiliary wooden board side rail 102. In this connection method, the fixing of the corner positions of the main wooden board side rail 101 and the auxiliary wooden board side rail 102 can be realized by screwing the fixing bolt 202, and the main wooden board side rail 101 and the auxiliary wooden board side rail 102 can also be disassembled and separated very conveniently, so that when one side of the main wooden board side rail 101 or the auxiliary wooden board side rail 102 is damaged, replacement operations can be carried out, improving the utilization efficiency of parts, with higher utilization rate and more economical;

[0037] Furthermore, the bolt groove 102b penetrates the length side wall of the auxiliary wooden board side rail 102. When disassembling the main wooden board side rail 101 and the auxiliary wooden board side rail 102, only need to loosen the fixing bolt 202, so that the positioning block 203 penetrates out of the limiting blind groove 102c, and the locking of the auxiliary wooden board side rail 102 can be released, facilitating the disassembly operation. The disassembly can be carried out with fewer turns of screwing the fixing bolt 202, which is more convenient.

[0038] The second embodiment is different from the first embodiment in the following features:

[0039] The corner positioning member 3 includes a column 301 slidably connected to the outer side of the main wooden board side rail 101 or the auxiliary wooden board side rail 102. The column 301 is vertically arranged. When the column 301 is slidably connected, a sliding sleeve can be arranged on the outer side of the main wooden board side rail 101 or the auxiliary wooden board side rail 102 to guide the column 301. Alternatively, a chute can be arranged on the side wall of the column 301, and a guiding strip slidably matched with the chute is arranged on the outer side of the main wooden board side rail 101 or the auxiliary wooden board side rail 102 to realize the guiding of the column 301. In addition, a limiting member 302 is arranged at the movable end of the column 301. The limiting member 302 has a corner structure. By using the sliding fit of the column 301, the limiting member 302 can be driven to move up and down. The limiting member 302 can be used to limit the corners of the other sand mold box 1, making the operation more flexible. When filling the sand into the sand mold box 1, the limiting member 302 can be received outside the sand mold box 1 by using the sliding of the column 301, which can make the operation surface more flat and convenient, providing convenience for the operation and avoiding the interference of the limiting member 302 on other ramming tools. When the sliding fit of the column 301 is a tight sliding fit, it can be arbitrarily arranged on the upper or lower sand mold box 1, rather than only arranged on the upper sand mold box 1, and the use range is wider.

[0040] In a preferred embodiment, the column 301 is in a broken line shape. Its vertical end is slidably matched with the main wooden board side rail 101 or the auxiliary wooden board side rail 102, and its broken line end is arranged away from the limiting member 302, which is convenient for the operator to manually operate and can avoid the situation that the column 301 slips off when the sliding sleeve guides the column 301, making the operation of the corner positioning member 3 more convenient when in use.

[0041] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A wooden mould for coin casting by ramming sand, comprising two moulding sand boxes (1), the two moulding sand boxes (1) being arranged one above the other, and the two moulding sand boxes (1) being provided with pouring holes (103) corresponding to each other, characterized in that: The molding sand box (1) comprises two main wooden board side rails (101) and two secondary wooden board side rails (102), the two main wooden board side rails (101) and the two secondary wooden board side rails (102) forming a frame body, the frame body is fixedly connected by corner fixing members (2) on all sides, and corner positioning members (3) corresponding to the lower molding sand box (1) are arranged at the diagonal of the upper molding sand box (1).

2. The wooden mold for coin casting by ramming sand according to claim 1, characterized in that: The inner walls of the auxiliary wooden board side rails (102) located on the same molding sand box (1) are symmetrically inclined, and the upper and lower molding sand boxes (1) form two trapezoidal adjacent surfaces as large end surfaces. Both ends of the auxiliary wooden board side rails (102) are provided with length positioning grooves (102a) corresponding to the insertion of the main wooden board side rails (101).

3. The wooden mold for coin casting by ramming sand according to claim 1 or 2, characterized in that: The corner fixing piece (2) is a corner iron, and the corner fixing piece (2) is connected and fixed to the main wooden board side rail (101) and the secondary wooden board side rail (102) by means of high-strength screws.

4. The wooden mold for coin casting by ramming sand according to claim 1 or 2, characterized in that: The corner fixing member (2) comprises a nut seat (201) fixedly connected to the side of the main wooden board side rail (101), a fixing bolt (202) being threadedly connected inside the nut seat (201), a positioning block (203) being arranged outside the fixing bolt (202), and a bolt groove (102b) corresponding to the fixing bolt (202) and a limiting blind groove (102c) corresponding to the insertion of the positioning block (203) being arranged on the secondary wooden board side rail (102).

5. The wooden mold for coin casting by ramming sand according to claim 4, characterized in that: The bolt groove (102b) passes through the length side wall of the secondary wooden board side rail (102).

6. The wooden mold for coin casting by ramming sand according to claim 1 or 2, characterized in that: Hand buckles (4) are provided on the outer sides of the upper and lower molding sand boxes (1).

7. The wooden mold for coin casting by ramming sand according to claim 1 or 2, characterized in that: The corner positioning piece (3) is a corner iron and is fixedly installed at a diagonal position of the molding sand box (1).

8. The wooden mold for coin casting by ramming sand according to claim 1 or 2, characterized in that: The corner positioning member (3) comprises a column (301) slidably connected to the outside of the main wooden board side rail (101) or the secondary wooden board side rail (102), and a limiting member (302) is provided at a movable end of the column (301), and the limiting member (302) is in a corner structure.

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