An inner stripping structure of a cage type wax pattern making mold having a stripping interference surface

Abstract

The application discloses an inner demoulding structure of a cage type wax mould making mould with a demoulding interference surface, which comprises a bottom disc and an inner mould mechanism, the inner mould mechanism comprises an inner mould body, a telescopic mould body and a telescopic mechanism for pushing and pulling the telescopic mould body, the inner mould mechanism is fixed on the bottom disc, the telescopic mould body is movably installed on the inner mould body in a radial telescopic mode, the outer end of the telescopic mould body is provided with an outer mould surface which is consistent with the inner side concave surface of the surrounding column, and when the telescopic mould body is extended, the inner mould body and the telescopic mould body form a complete inner mould, and the telescopic mechanism is arranged in the inner mould body and applies a radial outward pushing force and a retracting force to the telescopic mechanism. The cage type wax mould surrounding column can be formed at one time, and artificial scraping is not needed in the later period; the manufacturing precision of the cage type wax mould is improved; and the demoulding is smooth and does not need manual operation.

Description

Technical Field

[0001] This invention relates to an internal demolding structure for a cage-type wax mold making mold with a demolding interference surface, belonging to the field of mold technology. Background Technology

[0002] A wax model is a mold made of wax with a low melting point, used to create a runner for another mold. It occupies space in the initial stage of casting the other mold. After the other mold is cast, the wax model is melted and flows out, thus forming a runner for the molten casting in the other mold.

[0003] like Figure 2 , 10 As shown, the cage-type wax mold (11) has multiple surrounding pillars (111) on its outer perimeter. The only direction in which the inner mold comes out is downward. During the production process, the inner mold (3) and the outer mold (2) are clamped together to form a mold cavity. The melted wax is injected into the mold cavity. After cooling, the outer mold is removed and the inner mold comes out downward.

[0004] However, the lower section of each of the wax mold pillars (111) referred to in this application is a thickened pillar (1111). Relative to the thickened pillar (1111) at the bottom, an inner recessed surface (1112) is formed on the inner side of the section of pillar (111) above the thickened pillar (1111). In this way, an upward-facing surface is formed in the circumferential direction of the thickened part. This surface does not affect the demolding of the outer side for the parts located on both sides and the outer periphery of the pillar (111), but it forms an interference surface (1113) for the part located on the inner side of the pillar (111) that prevents the inner mold from being demolded downward.

[0005] The traditional method for making this type of wax model is to thicken the inner wall above the thickened part of the cage-type wax model (11) and make the inner wall of the middle and lower section of the column (111) into a vertical plane. After demolding, the thickened part of the upper section of the inner wall of the column (111) is manually removed with a knife to make it meet the basic requirements.

[0006] However, the above method has two drawbacks: first, manual cutting is time-consuming and labor-intensive; second, it is difficult to control the thickness of the cut, which can easily lead to substandard products. Summary of the Invention

[0007] The technical problem to be solved by this invention is: how to enable the cage-type wax mold with an interference surface on the inner side to be demolded, so as to avoid the need for manual cutting after the wax mold is formed, thereby improving product accuracy and reducing labor costs.

[0008] To address the above problems, the technical solution proposed by this invention is as follows: An internal demolding structure for a cage-type wax model making mold with a demolding interference surface includes a base and an internal mold mechanism. The internal mold mechanism includes an internal mold body, a telescopic mold body, and a telescopic mechanism for pushing the telescopic mold body to extend and retract. The internal mold mechanism is fixed on the base. The telescopic mold body is installed on the internal mold body in a radially extendable manner. The outer end of the telescopic mold body has an outer mold surface that is consistent with the shape of the inner recessed surface of the surrounding column. When extended, it forms a complete internal mold with the internal mold body. The telescopic mechanism is located inside the internal mold body and applies a radially outward pushing force and a retracting force to the telescopic mechanism.

[0009] Furthermore, the inner mold body is provided with a window corresponding to the inner recessed surface of the surrounding column, and the telescopic mold body is installed inside the window and can only perform radial telescopic expansion and contraction within the window.

[0010] Furthermore, the telescopic mechanism includes a guide body capable of moving up and down, which has guide surfaces circumferentially arranged in a number corresponding to the number of telescopic molds. The guide surfaces are downward and radially inward, so that the guide body forms a conical guide body that is larger at the top and smaller at the bottom. The guide surface has a guide groove, which includes a cavity and an opening. The width of the cavity is greater than the width of the opening. The rear end of the telescopic mold is provided with a guide block located in the cavity and capable of sliding along the cavity. There is a connecting block between the guide block and the telescopic mold located in the opening and capable of sliding in the opening.

[0011] Furthermore, the telescopic mechanism also includes a lifting column that can be raised and lowered, the upper end of which is fixed to the guide body.

[0012] Furthermore, the telescopic mechanism also includes a column spring, which is fitted onto a lifting column under the guide body. The lifting column presses on the upper end of the column spring, and the lower end of the column spring presses directly or indirectly on the chassis.

[0013] Furthermore, the telescopic mechanism also includes a pressing member that presses against the guide body.

[0014] Furthermore, the telescopic mechanism also includes a guide cup with a hole at the bottom through which the lifting column can pass. The inner mold body has a horizontal partition plate. The center of the partition plate has a hole of the same size as the guide cup opening, which allows the column spring to pass through. The guide cup opening is fixed upward to the lower bottom surface of the center of the partition plate. The lower section of the lifting column passes downward through the partition plate and the guide cup. The lower end of the column spring presses against the bottom of the guide cup through the hole.

[0015] Furthermore, the telescopic mold body is provided with a hot pressing cavity, and there is a heat-conducting wall between the outer mold surface of the telescopic mold body and the hot pressing cavity. The guide block and the connecting block are provided with bolt holes that radially penetrate the outer part of the guide block and the hot pressing cavity. The hot pressing cavity is provided with a hot pressing airbag, and there is a pressure bolt that can slide along the bolt hole in the bolt hole. The hot pressing airbag contains gas, which can push the pressure bolt out of the bolt hole and press it against the bottom of the groove cavity when it is heated and expanded.

[0016] Furthermore, the thermostatic airbag has an adhesive point between itself and the heat-conducting wall, and an adhesive point between itself and the pressure plug. When the thermostatic airbag is heated and retracts, it can completely pull the pressure plug back into the plug hole.

[0017] Furthermore, the gas injected into the thermopressurization chamber is nitrogen. Beneficial effects

[0018] 1. The inner concave surface of the cage-type wax mold column can be formed in one step without the need for manual scraping later. 2. It can improve the manufacturing precision of cage-type wax molds; 3. Demolding is smooth and requires no manual operation. Attached Figure Description

[0019] Figure 1 A three-dimensional schematic diagram of the internal demolding structure of a cage-type wax mold with a demolding interference surface; Figure 2 A schematic diagram showing the disassembly of the internal demolding structure of the mold for making the cage-type wax model with the demolding interference surface; Figure 3 This is a three-dimensional schematic diagram of the inner mold body; Figure 4 This is a three-dimensional schematic diagram showing the structural relationship between the guide block and the lifting column; Figure 5 for Figure 4 A partial schematic diagram of a horizontal cross-section; Figure 6 This is a three-dimensional schematic diagram of the guide body; Figure 7 This is a schematic diagram of the horizontal cross-sectional structure of the telescopic mold and guide block described in Embodiment 3; Figure 8 This is a schematic diagram of the horizontal cross-sectional structure of the telescopic mold described in Embodiment 3; Figure 9 This is a schematic diagram of the horizontal cross-sectional structure of the telescopic mold body described in Embodiment 3. The diagram shows the heated airbag being cooled and retracted, with the pressure plug already retracted into the plug hole. Figure 10 This is a three-dimensional schematic diagram of an existing internal demolding structure.

[0020] In the diagram: 1. Chassis; 2. Outer mold; 3. Inner mold; 31. Inner mold body; 311. Window; 312. Horizontal partition; 32. Telescopic mold body; 321. Connecting block; 322. Guide block; 323. Outer mold surface; 324. Hot pressing cavity; 3241. Heat-conducting wall; 325. Bolt hole; 4. Guide body; 41. Guide surface; 42. Guide groove; 421. Groove cavity; 422. Groove opening; 5. Lifting column; 6. Column spring; 7. Guide cup; 71. Hole 1; 8. Hot pressing airbag; 9. Pressure bolt; 10. Bonding point; 11. Cage wax model; 111. Surrounding column; 1111. Thickened column; 1112. Inner concave surface; 1113. Interference surface; 12. Lower pressing component. Detailed Implementation

[0021] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1

[0022] like Figure 1 , 2 As shown, an internal demolding structure for a cage-type wax model making mold with a demolding interference surface includes a base 1 and an inner mold mechanism. The inner mold mechanism includes an inner mold body 31, a telescopic mold body 32, and a telescopic mechanism for pushing the telescopic mold body 32 to extend and retract. The inner mold mechanism is fixed on the base 1. The telescopic mold body 32 is mounted on the inner mold body 31 in a radially extendable manner. The outer end of the telescopic mold body 32 has an outer mold surface 323 that matches the shape of the inner recessed surface 1112 of the surrounding column 111. When extended, it forms a complete inner mold 3 with the inner mold body 31. The telescopic mechanism is located inside the inner mold body 31 and applies a radially outward pushing force and a retraction force to the telescopic mechanism. When casting the cage-type wax model 11 with a demolding interference surface, the telescopic mold body 32 extends, so that its outer mold surface 323 at its outer end forms the inner recessed surface 1112 of the surrounding column 111. After the cast cage-type wax model 11 cools and solidifies, the telescopic mold body 32 retracts into the inner mold body 31. When the formed cage-type wax mold 11 is lifted upwards, the inner mold mechanism can smoothly detach downwards from the cage-type wax mold 11. In this way, the inner recessed surface 1112 of the surrounding column 111 is formed in one step without the need for subsequent manual scraping, saving a lot of labor costs, and also ensuring the forming accuracy of the inner recessed surface 1112 of the surrounding column 111.

[0023] It should be noted that the radial direction mentioned in this article is relative to the radial direction of the cylindrical inner mold 3.

[0024] Furthermore, the inner mold body 31 is provided with a window 311 corresponding to the inner recessed surface 1112 of the surrounding column 111, and the telescopic mold body 32 is installed in the window 311 and can only be radially telescopic within the window 311.

[0025] like Figure 2As shown in Figure 6, the telescopic mechanism includes a guide body 4 capable of vertical movement. The guide body 4 has a number of guide surfaces 41 circumferentially corresponding to the number of telescopic mold bodies 32. The guide surfaces 41 are downwardly inclined and radially inward, forming a tapered guide body 4 that is wider at the top and narrower at the bottom. The guide surfaces 41 have guide grooves 42, each including a cavity 421 and an opening 422. The width of the cavity 421 is greater than the width of the opening 422. At the rear end of each telescopic mold body 32, a guide block 322 is located within the cavity 421 and can slide along it. A connecting block 321 is located within the opening 422 and can slide within it. Thus, when the guide body 4 moves downward, it forces the guide block 322 to move upward within the cavity 421 of the guide groove 42 and push the telescopic mold body 32 outward, causing the telescopic mold body 32 to extend outward. When the guide body 4 moves upward, it forces the guide block 322 to move downward within the cavity 421 of the guide groove 42 and pulls the telescopic mold 32 inward, causing the telescopic mold 32 to extend and retract inward.

[0026] The telescopic mechanism also includes a lifting column 5 that can be raised and lowered, the upper end of which is fixed to the guide body 4. The upward and downward movement of the guide body 4 is driven by the raising and lowering of the lifting column 5.

[0027] The telescopic mechanism also includes a column spring 6, which is fitted onto the lifting column 5 below the guide body 4. The lifting column 5 presses down on the upper end of the column spring 6, and the lower end of the column spring 6 directly presses down on the chassis 1 (not shown in the figure). The telescopic mechanism also includes a lower pressing member 12, which presses down on the guide body 4. When the lower pressing member 12 presses down on the guide body 4, it forces the guide body 4 and the lifting column 5 to descend and simultaneously compress the column spring 6. When the pressure of the lower pressing member 12 on the guide body 4 is released, the elastic force of the column spring 6 forces the lifting column 5 and the guide body 4 to rise and return to their original positions. Here, the pressure applied to the lower pressing member 12 is by the upper mold in the entire device. Example 2

[0028] like Figure 2 , 3 As shown in Figure 4, the difference between this and Embodiment 1 is that the telescopic mechanism also includes a guide cup 7 with a hole 71 at the bottom through which the lifting column 5 can pass. The inner mold body 31 has a horizontal partition 312. The center of the partition 312 has a hole 2 that is the same size as the cup opening of the guide cup 7 and allows the column spring 6 to pass through. The cup opening of the guide cup 7 is fixed upward to the lower bottom surface of the center of the partition 312. The lower section of the lifting column 5 passes downward through the partition 312 and the guide cup 7. The lower end of the column spring 6 presses on the bottom of the guide cup 7 through the hole 2. That is, the lower end of the column spring 6 is indirectly pressed on the chassis 1. Example 3

[0029] like Figure 7As shown in Figure 9, the telescopic mold body 32 has a hot-pressing cavity 324. A heat-conducting wall 3241 connects the outer mold surface of the telescopic mold body 32 to the hot-pressing cavity 324. A guide block 322 and a connecting block 321 have bolt holes 325 that radially penetrate the guide block 322 and the hot-pressing cavity 324. A hot-pressing airbag 8 is located within the hot-pressing cavity 324. A pressure bolt 9, capable of sliding along the bolt hole 325, is located within the bolt hole 325. The hot-pressing airbag 8 contains gas, which, upon heating and expansion, pushes the pressure bolt 9 out of the bolt hole 325 and abuts it against the bottom of the groove in the cavity 421. An adhesive point 10 connects the hot-pressing airbag 8 to the heat-conducting wall 3241, and an adhesive point connects the hot-pressing airbag 8 to the pressure bolt 9. When the hot-pressing airbag 8 retracts upon heating, it can completely pull the pressure bolt 9 back into the bolt hole 325. The gas injected into the hot-pressing cavity 324 is nitrogen. The application principle of this embodiment is as follows: In order to smoothly push the guide block 322 up and down, a gap is left between the guide block 322 and the groove 421. This gap will make the guide block 322 very loose in the groove 421, resulting in the telescopic mold body 32 being able to retract indefinitely after it extends. Ultimately, this will result in inconsistent depth of the inner recessed surface 1112 of the column 111, which will seriously affect the product accuracy of the cage wax mold. However, in this embodiment, when the telescopic mold body 32 extends and the wax mold is poured, the high temperature (75 degrees Celsius) of the molten wax fluid will be used to heat the heat-conducting wall 3241 to cause the hot pressure airbag 8 to expand. This will push the pressure plug 9 out of the plug hole 325 and press it against the bottom of the groove 421, which can force the telescopic mold body 32 to extend into place and ensure that the inner recessed surface 1112 of the column 111 reaches the standard depth. Afterwards, the cooling of the newly cast cage wax mold causes the hot pressure airbag 8 to de-heat and retract, pulling the pressure bolt 9, which is bonded to the hot pressure airbag 8, back into the bolt hole 325, ensuring that the guide block 322 slides smoothly in the groove cavity 421.

[0030] The above embodiments are only used to describe the present invention more clearly, and should not be regarded as limiting the scope of protection covered by the present invention. Any equivalent modifications should be regarded as falling within the scope of protection covered by the present invention.

Claims

1. An internal demolding structure for a cage-type wax mold making mold with a demolding interference surface, comprising a base (1) and an inner mold mechanism, characterized in that: The inner mold mechanism includes an inner mold body (31), a telescopic mold body (32), and a telescopic mechanism for pushing the telescopic mold body (32) to extend and retract. The inner mold mechanism is fixed on the chassis (1). The telescopic mold body (32) is installed on the inner mold body (31) in a radially extendable manner. The outer end of the telescopic mold body (32) has an outer mold surface (323) that is consistent with the shape of the inner recessed surface (1112) of the surrounding column (111). When extended, it forms a complete inner mold (3) with the inner mold body (31). The telescopic mechanism is located inside the inner mold body (31) and applies radial force to the telescopic mold body (32). Outward thrust and retraction force; the inner mold body (31) is provided with a window (311) corresponding to the inner recessed surface (1112) of the surrounding column (111), the telescopic mold body (32) is installed in the window (311) and can only be radially telescopic within the window (311); the telescopic mechanism includes a guide body (4) that can move up and down, and its circumferential arrangement is provided with a number of guide surfaces (41) corresponding to the number of telescopic mold bodies (32), the guide surfaces (41) are downward and radially inward, so that the guide body (4) forms a cone-shaped guide body (4) that is larger at the top and smaller at the bottom, the... The guide surface (41) has a guide groove (42), which includes a cavity (421) and an opening (422). The width of the cavity (421) is greater than the width of the opening (422). The rear end of the telescopic mold (32) is provided with a guide block (322) located in the cavity (421) and capable of sliding along the cavity (421). There is a connecting block (321) between the guide block (322) and the telescopic mold (32) located in the opening (422) and capable of sliding in the opening (422). The telescopic mold (32) is provided with a hot pressing cavity (324). The outer mold surface of the telescopic mold (32) and the hot pressing cavity (324) have a heat-conducting wall (3241) that can conduct heat. The guide block (322) and the connecting block (321) are provided with bolt holes (325) that radially penetrate the outside of the guide block (322) and the hot pressing cavity (324). The hot pressing cavity (324) is provided with a hot pressing airbag (8). The bolt hole (325) is provided with a pressure bolt (9) that can slide along the bolt hole (325). The hot pressing airbag (8) contains gas. When heated and expanded, it can push the pressure bolt (9) out of the bolt hole (325) and press it against the bottom of the groove cavity (421).

2. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 1, characterized in that: The telescopic mechanism also includes a lifting column (5) that can be raised and lowered, the upper end of which is fixed to the guide body (4).

3. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 2, characterized in that: The telescopic mechanism also includes a column spring (6), which is mounted on a lifting column (5) under the guide body (4). The lifting column (5) presses on the upper end of the column spring (6), and the lower end of the column spring (6) presses directly or indirectly on the chassis (1).

4. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 2, characterized in that: The telescopic mechanism also includes a pressing member (12), which presses against the guide body (4).

5. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 3, characterized in that: The telescopic mechanism also includes a guide cup (7) with a hole (71) at the bottom through which the lifting column (5) can pass. The inner mold body (31) has a horizontal partition (312) inside. The center of the partition (312) has a hole (2) that is the same size as the cup opening of the guide cup (7) and allows the column spring (6) to pass through. The cup opening of the guide cup (7) is fixed upward on the lower bottom surface of the center of the partition (312). The lower section of the lifting column (5) passes downward through the partition (312) and the guide cup (7). The lower end of the column spring (6) presses on the bottom of the guide cup (7) through the hole (2).

6. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 1, characterized in that: There is an adhesive point (10) between the hot-pressing airbag (8) and the heat-conducting wall (3241), and there is an adhesive point between the hot-pressing airbag (8) and the pressure plug (9). When the hot-pressing airbag (8) is heated and retracted, it can completely pull the pressure plug (9) back into the plug hole (325).

7. The internal demolding structure of the cage-type wax model making mold with a demolding interference surface according to claim 1, characterized in that: The gas introduced into the thermocompression chamber (324) is nitrogen.

Images