Shrinkage-proof double-layer mold structure based on bucket tooth casting

Abstract

The utility model discloses an anti-shrinkage double-layer mold structure based on bucket tooth casting, and relates to the technical field of lost foam casting. The device comprises a pouring channel; the buffer mechanism is used for connecting the pouring channel and the to-be-poured model, and the inner wall of the buffer mechanism is fixedly connected with the outer wall of the pouring channel; the bucket tooth mechanism is used for providing a bucket tooth model, and the outer wall of the bucket tooth mechanism is fixedly connected with the outer wall of the buffer mechanism; the double-layer mold structure further comprises a collecting mechanism, the collecting mechanism is used for collecting gas generated by combustion, the outer wall of the collecting mechanism is fixedly connected with the outer wall of the pouring channel, and the gas generated after the double-layer mold structure disappears is collected through the collecting mechanism. And the phenomenon that gas generated after combustion of the lost foam enters a required workpiece to cause shrinkage porosity is prevented, so that the quality of the workpiece is improved, and the purpose of preventing the shrinkage porosity of the workpiece is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lost foam casting, in particular to an anti-shrinkage double-layer mold structure based on bucket tooth casting. Background Art

[0002] Lost foam casting is a casting process that uses foam plastic models as solid molds, combined with binder-free dry sand and vacuum technology to produce castings. This process involves bonding foam models of similar size and shape to the casting into a model cluster, brushing refractory coating and drying, and then burying them in dry quartz sand for vibration molding. The molten metal is poured under negative pressure to vaporize the foam model, and the liquid metal then occupies the model position, solidifies and cools to form a casting.

[0003] In the prior art, when lost foam is used for casting, the injected molten metal burns the lost foam due to its high temperature. When the lost foam is burned, some gas and impurities are generated. When the gas enters the molten metal of the desired workpiece, it causes shrinkage and the like when the workpiece is formed, thereby reducing the quality of the workpiece. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model solves the technical problems thereof by adopting a technical solution: a double-layer mold structure for preventing shrinkage and loosening based on bucket tooth casting, comprising: a pouring channel; a buffer mechanism, the buffer mechanism is used to connect the pouring channel and the model to be poured, the inner wall of the buffer mechanism is fixedly connected to the outer wall of the pouring channel; a bucket tooth mechanism, the bucket tooth mechanism is used to provide a bucket tooth model, the outer wall of the bucket tooth mechanism is fixedly connected to the outer wall of the buffer mechanism; the double-layer mold structure also includes: a collecting mechanism, the collecting mechanism is used to collect the gas generated by combustion, the outer wall of the collecting mechanism is fixedly connected to the pouring channel The outer wall of the double-layer mold structure is fixedly connected; the supporting mechanism is used to support the mold as a whole, and the outer wall of the supporting mechanism is fixedly connected to the outer wall of the pouring channel; the collecting mechanism includes a connecting plate, the outer wall of the connecting plate is fixedly connected to a trapezoidal block, the wall of the trapezoidal block is provided with an inclined groove, and the outer wall of the connecting plate is fixedly connected to the outer wall of the pouring channel; the outer wall of the pouring channel is fixedly connected to a connecting ring, and the inner wall of the pouring channel is fixedly connected to a pouring nozzle, so as to collect the gas generated after the disappearance of the double-layer mold structure, so as to prevent the gas generated after the combustion of the lost foam from entering the required workpiece and causing shrinkage.

[0005] Preferably, the buffer mechanism includes a buffer column, the outer wall of which is fixedly connected to a cylindrical flow channel, the bucket tooth mechanism includes a toothed foam block, a molding sand storage hole is opened in the wall of the toothed foam block, an anti-fall groove is opened in the wall of the toothed foam block, a concentrating block is fixedly connected to the bottom of the toothed foam block, the outer wall of the toothed foam block is fixedly connected to the outer wall of the cylindrical flow channel, the top of the buffer column is fixedly connected to the bottom of the connecting ring, the buffer mechanism reduces the amount of molding sand falling into the workpiece, and the bucket tooth mechanism concentrates part of the molding sand and generated debris at the position of the concentrating block to prevent shrinkage holes from occurring in the workpiece.

[0006] Preferably, the supporting mechanism includes a supporting flow channel, the outer wall of the supporting flow channel is fixedly connected to a slope block, the top of the slope block is fixedly connected to a collecting block, the outer wall of the supporting flow channel is fixedly connected to the outer surface of the pouring channel, and the supporting mechanism enables the double-layer mold structure to be stably placed in the casting box before casting. During casting, the cavity generated by the supporting mechanism can be used as a flow channel to accommodate impurities, thereby preventing some impurities from entering the desired workpiece.

[0007] The beneficial effects of the utility model are as follows:

[0008] 1. The utility model collects the gas generated after the double-layer mold structure disappears by arranging a collecting mechanism, thereby preventing the gas generated after the lost foam burns from entering the required workpiece to cause shrinkage, thereby improving the quality of the workpiece.

[0009] 2. The utility model provides a bucket tooth mechanism and a buffer mechanism. The buffer mechanism reduces the amount of fallen molding sand entering the workpiece, and the bucket tooth mechanism concentrates part of the entering molding sand and generated debris at the concentrated block position to prevent shrinkage holes from forming in the workpiece. At the same time, the double-layer setting increases the number of workpieces produced in a single casting.

[0010] 3. The utility model provides a supporting mechanism so that the double-layer mold structure can be stably placed in the casting box before casting. During casting, the cavity generated by the supporting mechanism can be used as a flow channel to accommodate impurities, thereby preventing some impurities from entering the desired workpiece, thereby achieving the purpose of improving the integrity of the workpiece by shifting the position of the impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the front view of the utility model;

[0012] Figure 2 It is a schematic diagram of the local structure of the pouring channel of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the bucket tooth mechanism of the utility model;

[0014] Figure 4It is a schematic diagram of the structure of the utility model at A;

[0015] Figure 5 It is a structural schematic diagram of B of the utility model.

[0016] In the figure: 1. pouring channel; 2. buffer mechanism; 3. bucket tooth mechanism; 4. collecting mechanism; 5. supporting mechanism; 6. connecting ring; 7. pouring nozzle; 21. buffer column; 22. cylindrical flow channel; 31. toothed foam block; 32. molding sand storage hole; 33. anti-fall groove; 34. centralizing block; 41. trapezoidal block; 42. connecting plate; 43. inclined groove; 51. supporting flow channel; 52. slope block; 53. collecting block. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

[0018] Example: See Figure 1 - Figure 5The utility model provides a technical solution: a double-layer mold structure for preventing shrinkage and loosening based on bucket tooth casting, comprising: a pouring channel 1; a buffer mechanism 2, the buffer mechanism 2 is used to connect the pouring channel 1 and the model to be poured, and the inner wall of the buffer mechanism 2 is fixedly connected to the outer wall of the pouring channel 1; a bucket tooth mechanism 3, the bucket tooth mechanism 3 is used to provide a bucket tooth model, and the outer wall of the bucket tooth mechanism 3 is fixedly connected to the outer wall of the buffer mechanism 2; the double-layer mold structure also includes: a collecting mechanism 4, the collecting mechanism 4 is used to collect the gas generated by combustion, and the outer wall of the collecting mechanism 4 is fixedly connected to the outer wall of the pouring channel 1; a supporting mechanism 5, the supporting mechanism 5 is used to support the mold as a whole, and the outer wall of the supporting mechanism 5 is fixedly connected to the outer wall of the pouring channel 1; the collecting mechanism 4 includes a connecting plate 42, the outer wall of the connecting plate 42 is fixedly connected with a trapezoidal block 41, and the wall of the trapezoidal block 41 is provided with an inclined surface The outer wall of the groove 43 and the connecting plate 42 are fixedly connected to the outer wall of the pouring channel 1; the outer wall of the pouring channel 1 is fixedly connected with a connecting ring 6, and the inner wall of the pouring channel 1 is fixedly connected with a pouring nozzle 7. The molten metal liquid is poured into the pouring channel 1 through the pouring nozzle 7. Due to the high temperature of the molten metal, the part of the mold structure that contacts the molten metal burns violently to produce gas. The gas floats upward due to the hot gas and its own weight, and the molten metal naturally falls due to gravity. At this time, the gas follows the flow channel after the pouring channel 1 disappears to the vicinity of the pouring nozzle 7. At this time, the gas passes through the cavity where the connecting plate 42 was previously located and enters the position of the trapezoidal block 41. Due to the setting of the inclined groove 43 of the trapezoidal block 41 itself, the cavity generated after the disappearance of the trapezoidal block 41 has an inclined surface. The gas will enter the cavity generated after the disappearance of the trapezoidal block 41 along the inclined surface, and collect excess gas.

[0019] The buffer mechanism 2 includes a buffer column 21, the outer wall of which is fixedly connected to a cylindrical flow channel 22, the bucket tooth mechanism 3 includes a toothed foam block 31, a molding sand storage hole 32 is provided in the wall of the toothed foam block 31, an anti-fall groove 33 is provided in the wall of the toothed foam block 31, a centralizing block 34 is fixedly connected to the bottom of the toothed foam block 31, the outer wall of the toothed foam block 31 is fixedly connected to the outer wall of the cylindrical flow channel 22, the top of the buffer column 21 is fixedly connected to the bottom of the connecting ring 6, due to the setting of the buffer column 21, when the molten metal refluxes to impact the molding sand, the fallen molding sand will fall to the buffer column 21 disappears and then produce In the generated cavity, after the reflux impact buffering through this cavity, the molten metal will enter the bucket tooth mechanism 3 through the cylindrical flow channel 22. Since the sand receiving hole 32 fixes the tooth-shaped foam block 31, the molten metal falling into the bucket tooth mechanism 3 is difficult to impact the tooth-shaped foam block 31, preventing the tooth-shaped foam block 31 from falling off due to vibration. Even if a small amount of molding sand falls and impurities generated after the combustion of the double-layer mold structure are flushed into the cavity generated by the concentrated block 34 by the flowing molten metal. The position of the concentrated block 34 does not belong to the necessary structure of the bucket tooth, so it is directly cut after casting.

[0020] The supporting mechanism 5 includes a supporting channel 51, the outer wall of which is fixedly connected with a slope block 52, the top of which is fixedly connected with a collecting block 53, the outer wall of the supporting channel 51 is fixedly connected to the outer surface of the pouring channel 1, and when the double-layer mold structure is placed in the casting box, the supporting mechanism 5 at the bottom of the pouring channel 1 is able to support the double-layer mold to be placed vertically due to the four extended supporting channels 51. When pouring begins, the double-layer mold structure, due to its lost foam nature, causes the original lost foam position to be replaced by molten metal, and impurities will rush to the bottom of the bottom pouring channel 1 with the flow of molten metal. The impurities eventually pass through the cavity formed by the supporting channel 51 and enter the cavity position generated by the slope block 52 and the collecting block 53. Due to the inclined surface setting of the slope block 52, the impurities floating on the molten metal are pushed to the collecting block 53.

[0021] Working principle:

[0022] When in use, the double-layer mold structure is placed vertically in the casting box, and the mold is covered with molding sand. By setting a collecting mechanism 4, the molten metal is poured into the pouring channel 1 through the pouring nozzle 7. Due to the high temperature of the molten metal, the part of the mold structure that contacts the molten metal burns violently to generate gas. Since the molten metal itself is heavy, the generated gas is lighter. In the flow channel generated after the pouring channel 1 disappears, the gas floats upward due to the heat and its own weight, and the molten metal naturally falls due to gravity. At this time, the gas flows along the flow channel after the pouring channel 1 disappears. The gas reaches the vicinity of the pouring nozzle 7. Due to the continuous high temperature near the pouring nozzle 7 when the molten metal is poured, the collecting mechanism 4 burns as a whole and generates a cavity. At this time, the gas passes through the cavity before the connecting plate 42 and enters the position of the trapezoidal block 41. Due to the setting of the inclined groove 43 of the trapezoidal block 41 itself, the cavity generated after the disappearance of the trapezoidal block 41 has an inclined surface. The gas will follow the inclined surface and enter the cavity generated after the disappearance of the trapezoidal block 41. By collecting excess gas, the gas is prevented from entering the bucket tooth mechanism 3, which causes the cast bucket teeth to shrink.

[0023] A bucket tooth mechanism 3 and a buffer mechanism 2 are provided. When the molten metal is poured into the pouring channel 1 and accumulates, the molten metal will pass through the buffer mechanism 2. When the molten metal reaches the bottom of the pouring channel 1, it will generate impact reflux, thereby causing the molding sand to fall, which is likely to cause shrinkage holes on the surface of the casting. Due to the provision of the connecting ring 6, the position of the buffer column 21 is not easy to shake, and due to the provision of the buffer column 21, when the molten metal refluxes to impact the molding sand, the fallen molding sand will fall into the cavity generated after the buffer column 21 disappears. After the reflux impact buffering through this cavity, the molten metal will enter the bucket tooth mechanism 3 through the cylindrical flow channel 22. Since the molding sand receiving hole 32 fixes the tooth-shaped foam block 31, The molten metal produced by falling into the bucket tooth mechanism 3 is difficult to impact the tooth-shaped foam block 31, thereby preventing the tooth-shaped foam block 31 from causing the molding sand to fall off due to vibration. The anti-fall groove 33 is arranged to contact the molding sand to have a slope, so that when the molten metal falls in, the molding sand is difficult to be hung by the corners of the tooth-shaped foam block 31. Even if a small amount of molding sand falls and impurities generated after the combustion of the double-layer mold structure are flushed into the cavity generated by the concentration block 34 by the flowing molten metal. The position of the concentration block 34 is not a necessary structure of the bucket tooth, so it is directly cut after casting to obtain a workpiece with a complete surface and no shrinkage holes. The double-layer bucket tooth mechanism 3 setting also enables more workpieces to be obtained in a single casting within a limited space.

[0024] A support mechanism 5 is provided. When the double-layer mold structure is placed in the casting box, the support mechanism 5 at the bottom of the pouring channel 1 is supported to be placed vertically due to the four extended support channels 51, so that the double-layer mold structure does not need to be fixed when the molding sand is placed in the casting box. When the casting starts, the double-layer mold structure, due to its lost foam nature, causes the original lost foam position to be replaced by molten metal. Since the lost foam is burned, gas and impurities are generated. The gas moves upward due to its light weight and the characteristics of intensified molecular motion caused by high temperature and is collected at the pouring nozzle 7 and the trapezoidal block 41. The impurities rush to the bottom of the bottom pouring channel 1 with the flow of molten metal. The impurities eventually pass through the cavity formed by the support channel 51 and enter the cavity position formed by the slope block 52 and the collecting block 53. Due to the inclined surface setting of the slope block 52, the impurities floating on the molten metal are pushed to the collecting block 53. Since the pouring channel 1 and the support mechanism 5 are not the required workpieces, the workpiece quality of the required bucket tooth is improved by transferring the position of the impurities.

[0025] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A double-layer mold structure for preventing shrinkage and porosity based on bucket tooth casting, comprising: Casting channel (1); A buffer mechanism (2), the buffer mechanism (2) being used to connect the pouring channel (1) and the model to be poured, the inner wall of the buffer mechanism (2) being fixedly connected to the outer wall of the pouring channel (1); A bucket tooth mechanism (3), the bucket tooth mechanism (3) being used to provide a bucket tooth model, the outer wall of the bucket tooth mechanism (3) being fixedly connected to the outer wall of the buffer mechanism (2); Characterized in that the double-layer mold structure also includes: A collecting mechanism (4), the collecting mechanism (4) is used to collect the gas generated by combustion, and the outer wall of the collecting mechanism (4) is fixedly connected to the outer wall of the pouring channel (1); A supporting mechanism (5), the supporting mechanism (5) being used to support the entire mold, the outer wall of the supporting mechanism (5) being fixedly connected to the outer wall of the pouring channel (1); The collecting mechanism (4) comprises a connecting plate (42), the outer wall of the connecting plate (42) is fixedly connected to a trapezoidal block (41), a bevel groove (43) is provided in the wall of the trapezoidal block (41), and the outer wall of the connecting plate (42) is fixedly connected to the outer wall of the pouring channel (1); The outer wall of the pouring channel (1) is fixedly connected to a connecting ring (6), and the inner wall of the pouring channel (1) is fixedly connected to a pouring nozzle (7).

2. The double-layer mold structure for preventing shrinkage and porosity based on bucket tooth casting according to claim 1, characterized in that: The buffer mechanism (2) comprises a buffer column (21), and the outer wall of the buffer column (21) is fixedly connected to a cylindrical flow channel (22).

3. The double-layer mold structure for preventing shrinkage and porosity based on bucket tooth casting according to claim 2 is characterized in that: The bucket tooth mechanism (3) comprises a tooth-shaped foam block (31), a molding sand storage hole (32) is provided in the wall of the tooth-shaped foam block (31), an anti-fall groove (33) is provided in the wall of the tooth-shaped foam block (31), and a centralizing block (34) is fixedly connected to the bottom of the tooth-shaped foam block (31).

4. The double-layer mold structure for preventing shrinkage and porosity based on bucket tooth casting according to claim 3 is characterized in that: The outer wall of the toothed foam block (31) is fixedly connected to the outer wall of the cylindrical flow channel (22), and the top of the buffer column (21) is fixedly connected to the bottom of the connecting ring (6).

5. The double-layer mold structure for preventing shrinkage and porosity based on bucket tooth casting according to claim 1, characterized in that: The support mechanism (5) comprises a support flow channel (51), the outer wall of the support flow channel (51) is fixedly connected to a slope block (52), the top of the slope block (52) is fixedly connected to a collecting block (53), and the outer wall of the support flow channel (51) is fixedly connected to the outer surface of the pouring channel (1).

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