Special-shaped guide self-sealing block pulling mechanism

Abstract

The present application relates to the technical field of mold processing, and relates to a special-shaped guide self-sealing pull-out block mechanism. The pull-out block mechanism comprises a pull-out block assembly, and the pull-out block assembly comprises: a fine positioning surface arranged on the pull-out block assembly and located at a parting line of a molding surface of a cavity and a bevel surface at a certain angle with a movement direction of the pull-out block; a surface contact sealing structure for forming surface contact sealing with a corresponding matching bevel surface arranged on a mold body when the pull-out block advances to a working position, so as to eliminate a matching gap between the molding surface of the pull-out block and the mold body; a transition surface connected between the fine positioning surface and a rear end of the pull-out block assembly, for forming an air flow channel between the pull-out block and the mold body when the pull-out block retreats to a non-working position; and a coarse positioning surface arranged on a side surface of the pull-out block assembly and having a matching surface parallel to the movement direction of the pull-out block, for being first contacted with the mold body and completing coarse guiding when the pull-out block advances. The present application utilizes a special-shaped structure of the pull-out block, and the relatively arranged bevel surfaces can complete fine guiding work of the pull-out block on the mold body, and the matching surface of the pull-out block can complete zero-gap fitting with the mold body and complete sealing.

Description

Technical Field

[0001] This invention relates to the field of mold processing technology, and in particular to an irregularly shaped guide self-sealing block pulling mechanism. Background Technology

[0002] In the field of precision casting and molding dies, the block-pulling structure is a key component for demolding complex curved surfaces, and its operational stability directly affects the quality of castings and production efficiency. Existing block-pulling mechanisms generally face the dual challenges of limited space and single function: on the one hand, the compact internal structure of the mold makes it difficult to install independent guiding and sealing devices; on the other hand, traditional clearance fit designs easily allow sand particles or residual material to intrude into the fit gaps, causing wear, jamming, and flash defects. Especially in automated continuous production scenarios, these problems lead to frequent downtime for cleaning and component replacement, significantly reducing production efficiency and product consistency.

[0003] Taking a hot core box mold as an example, its molding medium is coated sand, which requires overall heating. When the drawing block operates under high temperature and high pressure, the sand particles tend to penetrate the mating surface with the gas. Given the limited mold space, existing general structures cannot be designed with additional guiding mechanisms and can only rely on the planar fit between the drawing block body and the mold body. This makes it difficult to control the gap during movement, resulting in excessive flash and frequent air leakage defects. Furthermore, the hardening of accumulated sand particles can easily cause the drawing block to jam or even fail. The small gap also makes on-site cleaning inconvenient, requiring the mold to be removed from the machine for disassembly, further increasing maintenance costs and downtime.

[0004] Therefore, this application proposes an irregularly shaped guided self-sealing block extraction mechanism. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by designing a block-pulling mechanism that integrates guiding, sealing, and easy-to-clean functions. This mechanism achieves active sealing and efficient cleaning through structural innovation under conditions of limited space: on the one hand, it achieves partial sealing through the non-planar mating surface between the block-pulling body and the mold body, blocking the path of sand particles and effectively solving the industry problem of easy wear and sand accumulation in the block-pulling mechanism under space constraints; on the other hand, it utilizes an integrated airflow channel on the inner side of the sealing surface, using compressed air to blow residual sand particles away from the mating surface when the block retracts, avoiding manual disassembly and cleaning and significantly improving the convenience of mold maintenance.

[0006] The technical solution of the present invention, in its first aspect, provides an irregularly shaped guided self-sealing block-pulling mechanism, including a block-pulling assembly, the block-pulling assembly comprising: The precision positioning surface is set on the block assembly and is an inclined plane at a certain angle to the direction of block movement at the parting line of the cavity forming surface. It is used to form a surface contact seal with the corresponding mating inclined surface on the mold body when the block moves forward to the working position, so as to eliminate the mating gap between the block forming surface and the mold body. The transition surface connects the precision positioning surface and the rear end of the block assembly, and is used to form an airflow channel between the block and the mold body when the block retracts to the non-working position. The coarse positioning surface is located on the side of the block assembly and has a mating surface parallel to the direction of block movement. It is used to contact the mold body first and complete the coarse guidance when the block moves forward.

[0007] Preferably, the precision positioning surface includes two inclined planes that are opposite each other and have the same angle between them.

[0008] Preferably, the angle between the precision positioning surface and the direction of block movement is an acute angle, 15°-20°.

[0009] Preferably, the mold body has pre-machined venting channels.

[0010] Preferably, the transition surface corresponds to the pre-machined venting channel on the mold body when the block retracts, together forming an airflow channel connecting the cavity and the outside.

[0011] Preferably, when the block assembly retracts, the gap between the precision positioning surface and the mold body increases with the increase of the retraction stroke. This gap forms part of the airflow channel, allowing compressed air to blow residual sand particles away from the mating surface along the airflow channel.

[0012] Preferably, the mating clearance between the coarse positioning surface and the mold body is greater than the mating clearance between the fine positioning surface and the mold body, so as to achieve a gradual mating process of first coarse guidance and then fine positioning.

[0013] Preferably, a cylinder connection assembly is provided at the tail end of the block extraction assembly; The block-pulling assembly is connected to the cylinder via a cylinder connection assembly and moves within the mold body under the drive of the cylinder.

[0014] A second aspect of the present invention provides a mold comprising the above-described irregularly shaped guide self-sealing block pulling mechanism.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The irregular structure of the drawing block and the relatively arranged inclined surfaces can be used to complete the precise guiding work of the drawing block on the mold body.

[0016] 2. The irregular shape of the pull-out blocks can be utilized to achieve zero-gap fit between the mating surfaces of the pull-out blocks and the mold body, thus achieving a sealing effect.

[0017] 3. The irregular shape of the pump block can be utilized, which will form an airflow channel with a relatively large gap when the pump block retracts, which facilitates the cleaning of compressed air.

[0018] 4. The irregular shape of the drawing block can be used to reduce the friction interface between the drawing block and the mold body, thereby reducing the relative friction between the two and effectively improving the service life of the drawing block. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the block-pulling component in an embodiment of the present invention; Figure 2 This is a schematic diagram of the block extraction assembly and the mold in a closed state in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section in part E; Figure 4 This is a schematic diagram of the structure of the block-pulling assembly and the mold in the retracted state in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of a section of part F in the middle; Figure 6 This is a comparison chart of the normal block extraction and the modified block extraction rollback states.

[0020] Reference numerals: 1. Pull-out block assembly; 11. Cavity forming surface; 12. Fine positioning surface; 13. Transition surface; 14. Cylinder connecting assembly; 15. Coarse positioning surface; 2. Cylinder; 3. Exhaust channel; 4. Ordinary pull-out block; 5. Mold body. Detailed Implementation Example 1

[0021] like Figure 2-3 As shown, in order to ensure guiding accuracy and avoid mold wear, ordinary guide blocks 4 typically use quick-change, relatively mounted, high-hardness, wear-resistant standard parts for guidance. However, wear-resistant standard parts have size limitations for ease of processing and strength assurance. Furthermore, to ensure mold strength, the width of the guide block generally needs to be greater than 40mm for normal use. However, with technological innovation and development, many products require the machining of small holes, resulting in smaller guide block structures and making it impossible to use wear-resistant standard parts. In such cases, the guide block must directly contact the mold body 5 for guidance. The friction between the guide block and the mold body 5 causes wear on both, severely affecting quality stability and mold life.

[0022] To address the aforementioned problems, this embodiment proposes an irregularly shaped guiding self-sealing block-pulling mechanism, taking a hot core box mold as an example. Figure 1 As shown, it includes a block extraction component 1, which includes: The precision positioning surface 12 is set on the block assembly 1 and is an inclined plane at a certain angle to the direction of block movement at the parting line of the cavity forming surface 11. It is used to form a surface contact seal with the corresponding mating inclined surface on the mold body 5 when the block moves forward to the working position, so as to eliminate the mating gap between the block forming surface and the mold body 5. The precision positioning surface 12 includes two inclined planes that are opposite each other and have the same angle between their opposite surfaces. The angle between the precision positioning surface 12 and the direction of block movement is an acute angle of 15°-20°. At this angle, the strength of the mold body 5 will not be affected.

[0023] The transition surface 13 connects the precision positioning surface 12 and the rear end of the block-pulling assembly 1, and is used to form an airflow channel between the block-pulling assembly 1 and the mold body 5 when the block-pulling assembly retracts to the non-working position. An exhaust channel 3 is pre-machined on the mold body 5. When the block-pulling assembly retracts, the transition surface 13 corresponds to the exhaust channel 3 pre-machined on the mold body 5, and together they form an airflow channel connecting the cavity and the outside. The height of the airflow channel when the block-pulling assembly retracts is greater than the fit clearance of the precision positioning inclined surface when it is in the working position, so that compressed air can blow residual sand particles away from the mating surface along the airflow channel.

[0024] The coarse positioning surface 15 is located on the side of the block-pulling assembly 1 and has a mating surface parallel to the direction of block movement. It is used to contact the mold body 5 first and complete the coarse guidance when the block moves forward. The mating clearance between the mating surface of the coarse positioning surface 15 and the mold body 5 is greater than the mating clearance between the fine positioning surface 12 and the mold body 5, so as to achieve the step-by-step mating of coarse guidance and fine positioning.

[0025] During mold production, the product is pulled forward. The coarse positioning surface 15 first contacts the mold body 5 to complete the coarse guidance of the pulling block. Then, when the fine positioning surface 12 of the pulling block contacts the mold body 5, the cavity forming surface 11 at the front end of the pulling block automatically corrects its position, completing the fine positioning and sealing action between the pulling block and the mold body 5.

[0026] like Figure 4-5 As shown, when product production is finished, the pull block retracts first, and the product is demolded. When the pull block retracts, only the rough positioning surface 15 rubs against the mold body 5; other parts of the pull block do not experience friction. Simultaneously, a large channel is formed between the fine positioning slope and the mold body. When cleaning the mold cavity with compressed air, the compressed air blows out residual sand and impurities from the cavity along the venting channels formed between the fine positioning slope and the mold body, and along the pre-machined venting channels on the mold body, completing the cleaning process.

[0027] like Figure 6 As shown, when using a standard pull block, because the structure of the standard pull block is horizontal, it is parallel to the surface of the mold body 5, forming an assembly gap between them; without considering wear, this assembly gap remains constant; in the retracted state, because the mating gap of the mating surfaces is very small, waste sand cannot be discharged; and Figure 5When the extraction block in this embodiment is used, in the retracted state, the gap between the mold body 5 and the inclined surface of the extraction block is proportional to the stroke of the extraction block. The larger the stroke, the larger the gap of the inclined surface. This gap constitutes part of the airflow channel, so that compressed air can blow the residual sand particles away from the mating surface along the airflow channel; therefore, sand can be discharged quickly under the action of airflow.

[0028] Finally, in this embodiment, a cylinder connecting component 14 is provided at the tail of the block-pulling assembly 1; the block-pulling assembly 1 is connected to the cylinder 2 through the cylinder connecting component 14, and moves in the mold body 5 under the drive of the cylinder 2. This embodiment provides a solution that can eliminate the gap between the forming surfaces to improve the sealing effect of the mold cavity. In addition to eliminating flash on the product surface and improving product quality, it also facilitates the integrity of the product stamping and improves the surface quality. Furthermore, a larger venting groove can be formed during the cleaning stage to facilitate the discharge of waste sand, and effective cavity cleaning can be completed simultaneously. At the same time, it eliminates the relative sliding friction between the block-pulling assembly and the mold body that was unavoidable when a standard wear-resistant block structure could not be installed, thereby improving the life of the mold and the block-pulling assembly and reducing maintenance costs. Example 2

[0029] This embodiment provides a mold that uses the irregularly shaped guide self-sealing pull-out block mechanism from Embodiment 1. When processing products using this mold, a partial seal is achieved through the non-planar mating surface between the pull-out block body and the mold body, blocking the path of sand particles intrusion and effectively solving the industry problem of easy wear and sand jamming of the pull-out block under limited space. On the other hand, by utilizing the integrated airflow channel on the inner side of the sealing surface, compressed air is sprayed out through the airflow channel when the pull-out block retracts, blowing residual sand particles away from the mating surface, avoiding manual disassembly and cleaning, and significantly improving the convenience of mold maintenance.

[0030] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A non-circularly shaped, self-sealing block-pulling mechanism, comprising a block-pulling assembly (1), characterized in that, The block extraction component (1) includes: The precision positioning surface (12) is set on the block assembly (1) and is an inclined plane at a certain angle to the direction of block movement at the parting line of the cavity forming surface (11); it is used to form a surface contact seal with the corresponding mating inclined surface on the mold body (5) when the block moves forward to the working position, so as to eliminate the mating gap between the block forming surface and the mold body (5). The transition surface (13) is connected between the precision positioning surface (12) and the rear end of the block assembly (1) to form an airflow channel between the block and the mold body (5) when the block retracts to the non-working position. The coarse positioning surface (15) is set on the side of the block assembly (1) and has a mating surface parallel to the direction of block movement. It is used to contact the mold body (5) first and complete the coarse guidance when the block moves forward.

2. The irregularly shaped guide self-sealing block pulling mechanism according to claim 1, characterized in that, The precision positioning surface (12) includes two inclined planes that are opposite each other and have the same angle between them.

3. The irregularly shaped guide self-sealing block pulling mechanism according to claim 1, characterized in that, The angle between the precision positioning surface (12) and the direction of block movement is an acute angle, which is 15°-20°.

4. The irregularly shaped guide self-sealing block pulling mechanism according to claim 1, characterized in that, The mold body (5) has a pre-machined venting channel (3).

5. The irregularly shaped guide self-sealing block pulling mechanism according to claim 4, characterized in that, The transition surface (13) corresponds to the pre-machined exhaust channel (3) on the mold body (5) when the block assembly (1) retracts, and together they form an airflow channel connecting the cavity and the outside.

6. The irregularly shaped guide self-sealing block pulling mechanism according to claim 5, characterized in that, When the block assembly (1) retracts, the gap between the precision positioning surface (12) and the mold body (5) increases with the increase of the retraction stroke. This gap forms part of the airflow channel, allowing compressed air to blow residual sand particles away from the mating surface along the airflow channel.

7. The irregularly shaped guide self-sealing block pulling mechanism according to claim 1, characterized in that, The mating clearance between the rough positioning surface (15) and the mold body (5) is greater than the mating clearance between the fine positioning surface (12) and the mold body (5) to achieve a gradual fit of rough guidance followed by fine positioning.

8. The irregularly shaped guide self-sealing block pulling mechanism according to claim 1, characterized in that, The tail end of the block-pulling assembly (1) is provided with a cylinder connection assembly (14). The block-pulling assembly (1) is connected to the cylinder (2) via the cylinder connection assembly (14) and moves in the mold body (5) under the drive of the cylinder (2).

9. A mold, characterized in that, Includes the irregularly shaped guide self-sealing block pulling mechanism as described in any one of claims 1 to 8.

Images