Lost foam mold

Abstract

The utility model provides an evanescent mode mould which comprises an upper mould, a lower mould, a demoulding plate and a demoulding mechanism, the demolding mechanism comprises a guide seat fixed on the lower mold, a pull rod of which the top end is fixed with the demolding plate and which vertically extends downwards into the lower mold, an ejector rod obliquely arranged in the guide seat in a penetrating manner, a movable block fixed at the top of the ejector rod, and a sliding rod for connecting the ejector rod and the pull rod. The ejector rod penetrates through the demolding plate, the top of the ejector rod extends to the position above the demolding plate and is fixed to the movable block, and the bottom of the ejector rod extends into the lower mold and is connected with the bottom of the pull rod through a sliding rod. When the lower mold is demolded, the demolding plate moves upwards and drives the pull rod to move upwards, so that the ejector rod is driven by the sliding rod to obliquely move upwards under the support of the guide seat, the loose piece is controlled to obliquely move, and the inner buckling part of the lost foam pattern corresponding to the loose piece can be smoothly and completely demolded, so that the mold is simplified, and the mold is applicable and efficient; the problem that in the prior art, an evanescent mode with a buckle cannot be automatically demolded is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mold demoulding, in particular to a lost foam mold. Background Art

[0002] Lost foam casting, also known as negative pressure solid mold casting (EPC), uses expandable polystyrene (EPS) as raw material to make a foam pattern (foam white mold) for casting. It is the main way of green intensive casting and will occupy an increasingly important position in casting production. As a new manufacturing process, the advantages of lost foam casting are becoming increasingly apparent in today's society, especially in terms of energy conservation and environmental protection, reducing energy consumption and production costs, which will have a far-reaching impact on the manufacturing industry.

[0003] At present, although the lost foam mold industry has been widely developed in recent years and has gradually become an important part of the manufacturing industry, there are still some problems and challenges. The existing lost foam molds on the market have low automation and low production efficiency, resulting in high costs and unstable quality. Especially when encountering demoulding with inner buckle patterns, most of them are currently manually taking out the lost foam mold pattern and the inner buckle insert inside and then peeling it off, resulting in low production efficiency. Some manufacturers will externally connect the lower mold ejection mechanism to the above situation, but the ejection movement is often unbalanced, resulting in deformation or damage of the lost foam pattern and increased mold opening costs.

[0004] Therefore, it is necessary to provide a lost foam mold to overcome the above-mentioned defects. Utility Model Content

[0005] The utility model aims to provide a lost foam mould.

[0006] According to one aspect of the utility model, there is provided a lost foam mold, comprising:

[0007] upper mold;

[0008] Lower mold;

[0009] A stripping plate, the stripping plate being located between the upper die and the lower die;

[0010] A demoulding mechanism, the demoulding mechanism comprising a guide seat fixed on the lower mold, a pull rod whose top end is fixed to the demoulding plate and vertically extends downward into the lower mold, a push rod obliquely inserted into the guide seat, a loose block fixed to the top of the push rod, and a sliding rod connecting the push rod and the pull rod;

[0011] The ejector rod passes through the stripping plate, the top of the ejector rod extends to the top of the stripping plate and is fixed to the loose block, and the bottom of the ejector rod extends into the lower die and is connected to the bottom of the pull rod through a sliding rod;

[0012] When the lower mold is demoulded, the demoulding plate moves upward, driving the pull rod to move upward, thereby driving the ejector rod to move obliquely upward under the support of the guide seat through the slide rod, thereby controlling the oblique movement of the movable block.

[0013] Preferably, the lower mold includes an upper panel and a side wall located on the periphery of the upper panel and extending downward, the guide seat is fixed on the upper panel and located below the stripping plate, the guide seat includes an inclined guide rail, the push rod is inclined in the guide rail and can move along the extension direction of the rail.

[0014] Preferably, the pull rod comprises a fixing seat fixed to the stripping plate and a pull rod body vertically extending downward from the fixing seat, the pull rod body passes through the upper panel, and a sliding hole for the sliding rod to pass horizontally is provided at the bottom of the pull rod body.

[0015] Preferably, the push rod is arranged obliquely from bottom to top away from the pull rod body, and the angle formed by the push rod and the pull rod body is an acute angle.

[0016] Preferably, one end of the sliding rod is fixed to the bottom of the top rod, and the other end of the sliding rod passes through the sliding hole. The sliding rod is horizontally extended and can slide in the sliding hole.

[0017] Preferably, the guide seat comprises a through opening communicated with the guide rail, and the provision of the through opening can avoid interference between the slide rod and the guide seat during the upward movement of the push rod.

[0018] Preferably, a top protrusion is provided on the stripping plate, and a molding portion is provided on the upper panel. When the stripping plate does not move upward, the movable block, the top protrusion and the molding portion are combined to form an inner cavity structure of the lost foam. When the stripping plate moves upward, the top protrusion and the movable block are driven to move upward synchronously and the movable block moves obliquely upward, and the molding portion remains stationary.

[0019] Preferably, the guide rail is connected to the through opening to form a T-shaped groove.

[0020] Compared with the prior art, the lost foam mold provided by the utility model has the following beneficial effects:

[0021] Due to the adoption of the above technical scheme, the utility model has the advantages of simple structure, ingenious design and low cost. When the lower demoulding is performed, the pull rod installed on the demoulding plate drives the sliding rod to move in the sliding hole, and then drives the ejector rod to move obliquely upward along the guide rail in the guide seat, so that the movable block on the top of the ejector rod retreats, and then the inner buckle part of the lost foam pattern corresponding to the movable block can be smoothly and completely demoulded; the demoulding mechanism is linked with the demoulding plate to achieve oblique movement, so that the lost foam pattern can be automatically demoulded, which simplifies the complex and is applicable and efficient. It effectively solves the problems of the lost foam with buckles in the prior art that cannot be automatically demoulded and the low production efficiency, as well as other existing problems of unbalanced and unstable ejection movement using an external lower mold ejection mechanism, avoids deformation and damage of the lost foam pattern, and reduces the mold opening cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 It is a three-dimensional diagram of the lost foam mold of the utility model;

[0024] Figure 2 It is a front view of the lost foam mold of the utility model in the mold closing state;

[0025] Figure 3 for Figure 2 The cross-sectional view of the AA surface;

[0026] Figure 4 This is the main view of the lost foam mold of the utility model in the mold opening state;

[0027] Figure 5 for Figure 4 A cross-sectional view of the BB surface;

[0028] Figure 6 It is a partial cross-sectional view of the lost foam mold of the utility model;

[0029] Figure 7 A three-dimensional diagram of the guide seat of the utility model;

[0030] Figure 8 It is a schematic diagram of the stripping plate of the lost foam mold of the utility model in a state where the stripping plate has not been moved upward;

[0031] Fig. 9 It is a schematic diagram of the state after the stripping plate of the lost foam mold of the utility model is moved upward.

[0032] Among them, 1. upper mold, 11. first connecting seat, 2. demoulding plate, 21. second connecting seat, 22. third connecting seat, 23. top protrusion, 3. lower mold, 31. fourth connecting seat, 32. upper panel, 321. forming part, 33. side wall, 4. demoulding mechanism, 41. guide seat, 411. guide rail, 412. through port, 42. pull rod, 421. fixed seat, 422. pull rod body, 4221. sliding hole, 43. ejector rod, 44. movable block, 45. sliding rod, 46. first connecting rod, 47. second connecting rod, 5. lost foam pattern. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0039] See also Figure 1 The present embodiment discloses a lost foam mold, comprising an upper mold 1, a lower mold 3, a stripper plate 2 and a stripper mechanism 4. The lower mold 3 is located below the upper mold 1, and the stripper plate 2 is located between the upper mold 1 and the lower mold 3. The upper mold 1 includes four first connecting seats 11 located at four corners on both sides thereof. The stripper plate 2 includes a second connecting seat 21 arranged in correspondence with the first connecting seat 11. Four third connecting seats 22 are arranged on the circumferential side of the stripper plate, and a fourth connecting seat 31 is arranged in correspondence with the third connecting seat 22 on the side of the lower mold 3.

[0040] See also Figures 2 to 5 The lower mold 3 includes an upper panel 32 and a side wall 33 located on the periphery of the upper panel 32 and extending downward. The demoulding mechanism 4 includes a guide seat 41, a pull rod 42, a push rod 43, a loose block 44 and a slide rod 45. The guide seat 41 is fixed on the upper panel 32 and is located below the demoulding plate 2. The top end of the pull rod 42 is fixed to the demoulding plate 2 and extends vertically downward into the lower mold 3. The push rod 43 is obliquely inserted into the guide seat 41, the loose block 44 is fixed to the top of the push rod 43, and the slide rod 45 is arranged below the upper panel 32 and connects the push rod 43 and the pull rod 42.

[0041] See also Figure 6 and Figure 7 The guide seat 41 includes an inclined guide rail 411 and a through-port 412 connected to the guide rail 411. The width of the guide rail 411 is wider than the width of the through-port 412, and the guide rail 411 and the through-port 412 are connected to form a T-slot. The opening of the through-port 412 faces the side where the pull rod 42 is located. The ejector rod 43 is inclinedly arranged in the guide rail 411 and can move along the extension direction of the guide rail 411. The ejector rod 43 passes through the stripping plate 2, the top of the ejector rod 43 extends to the top of the stripping plate 2 and is fixed to the movable block 44, and the bottom of the ejector rod 43 extends into the lower mold 3 and is connected to the bottom of the pull rod 42 through the slide rod 45.

[0042] See also Figure 3The pull rod 42 includes a fixing seat 421 fixed to the stripping plate 2 and a pull rod body 422 extending vertically downward from the fixing seat 421. The top rod 43 is tilted away from the pull rod body 422 from bottom to top, and the angle a formed by the top rod 43 and the pull rod body 422 is an acute angle. The pull rod body 422 passes through the upper panel 32, and a sliding hole 4221 is provided at the bottom of the pull rod body 422 for the sliding rod 45 to pass horizontally. One end of the sliding rod 45 is fixed to the bottom of the top rod 43, and the other end of the sliding rod 45 passes through the sliding hole 4221. The sliding rod 45 is horizontally extended and can slide in the sliding hole 4221 during the upward movement of the stripping plate 2.

[0043] See also Figure 8 and Fig. 9 A top protrusion 23 is provided on the stripper plate 2, and a forming portion 321 is provided on the upper panel 32. When the stripper plate 2 does not move upward, the movable block 44, the top protrusion 23 and the forming portion 321 are combined to form an inner cavity structure of the lost foam. When the stripper plate 2 moves upward, the top protrusion 23 and the movable block 44 are driven to move upward synchronously, and the movable block 44 moves obliquely upward, and the forming portion 321 remains stationary.

[0044] See also Figure 1 The demoulding mechanism 4 further includes a first connecting rod 46 connecting the upper mold 1 and the demoulding plate 2 and a second connecting rod 47 connecting the demoulding plate 2 and the lower mold 3. The top of the first connecting rod 46 is connected to the first connecting seat 11, and the bottom of the first connecting rod 46 is connected to the second connecting seat 21. The top of the second connecting rod 47 is connected to the third connecting seat 22, and the bottom of the second connecting rod 47 is connected to the fourth connecting seat 31. The first connecting rod 46 can slide up and down in the second connecting seat 21, and the second connecting rod 47 can slide up and down in the fourth connecting seat 31.

[0045] During the mold opening process, when the upper mold 1 moves upward, while the upper mold 1 is demoulded, the first connecting rod 46 is driven upward through the first connecting seat 11, and then the demoulding plate 2 is driven upward through the second connecting seat 21 to demould the lower mold 3, and the second connecting rod 47 is driven upward in the fourth connecting seat 31 through the third connecting seat 22. The first connecting rod 46 and the second connecting rod 47 play a guiding and limiting role during mold opening and mold closing, which facilitates accurate and rapid mold opening and mold closing, and at the same time, ensures that the entire demoulding plate 2 moves smoothly, with low manufacturing cost, and the overall mold demoulding linkage is strong and the stability is high.

[0046] For the lost foam pattern 5 containing an inward buckle shape, it is necessary to set a movable block 44 corresponding to the structure on the mold to cooperate with the model to form the structure. The demoulding structure in this embodiment can well solve the problem of difficulty in automatic demoulding. During the mold opening process, when the lower mold 3 is demoulded, the demoulding plate 2 moves up, driving the pull rod 42 to move up, and while the pull rod body 422 moves up, the push rod 43 is driven by the slide rod 45 to move obliquely upward along the guide rail 411, thereby controlling the movable block 44 to move obliquely. At the same time, the slide rod 45 slides in the sliding hole 4221 toward the side where the push rod 43 is located. During the upward movement of the push rod 43, the setting of the through port 412 can avoid interference and collision between the slide rod 45 and the guide seat 41, and the slide rod 45 can move up to the through port 412, so that its movement stroke is larger.

[0047] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A lost foam mold, characterized in that: include: upper mold; Lower mold; A stripping plate, the stripping plate being located between the upper die and the lower die; A demoulding mechanism, the demoulding mechanism comprising a guide seat fixed on the lower mold, a pull rod whose top end is fixed to the demoulding plate and vertically extends downward into the lower mold, a push rod obliquely inserted into the guide seat, a loose block fixed to the top of the push rod, and a sliding rod connecting the push rod and the pull rod; The ejector rod passes through the stripping plate, the top of the ejector rod extends to the top of the stripping plate and is fixed to the loose block, and the bottom of the ejector rod extends into the lower die and is connected to the bottom of the pull rod through a sliding rod; When the lower mold is demoulded, the demoulding plate moves upward, driving the pull rod to move upward, thereby driving the ejector rod to move obliquely upward under the support of the guide seat through the slide rod, thereby controlling the oblique movement of the movable block.

2. The lost foam mold according to claim 1, characterized in that: The lower mold includes an upper panel and a side wall located on the periphery of the upper panel and extending downward. The guide seat is fixed on the upper panel and located below the stripping plate. The guide seat includes an inclined guide rail. The ejector rod is inclined in the guide rail and can move along the extension direction of the rail.

3. The lost foam mold according to claim 2, characterized in that: The pull rod comprises a fixing seat fixed to the stripping plate and a pull rod body vertically extending downward from the fixing seat. The pull rod body passes through the upper panel, and a sliding hole for the sliding rod to pass horizontally is provided at the bottom of the pull rod body.

4. The lost foam mold according to claim 3, characterized in that: The push rod is arranged obliquely from bottom to top away from the pull rod body, and the angle formed by the push rod and the pull rod body is an acute angle.

5. The lost foam mold according to claim 4, characterized in that: One end of the sliding rod is fixed to the bottom of the top rod, and the other end of the sliding rod passes through the sliding hole. The sliding rod is horizontally extended and can slide in the sliding hole.

6. The lost foam mold according to claim 5, characterized in that: The guide seat comprises a through opening which is communicated with the guide rail. When the push rod moves upward, the setting of the through opening can avoid interference between the slide rod and the guide seat.

7. The lost foam mold according to claim 6, characterized in that: The stripping plate is provided with a top protrusion, and the upper panel is provided with a molding portion. When the stripping plate does not move upward, the movable block, the top protrusion and the molding portion are combined to form a lost foam inner cavity structure. When the stripping plate moves upward, the top protrusion and the movable block are driven to move upward synchronously and the movable block moves obliquely upward, while the molding portion remains stationary.

8. The lost foam mold according to claim 6, characterized in that: The guide rail is connected with the through opening to form a T-shaped groove.

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