Modeling method for preventing blank holder from deforming

Abstract

The invention discloses a modeling method for preventing deformation of a blank holder, and particularly relates to the technical field of casting, the blank holder comprises a blank holder body, the inner surface wall of the blank holder body is connected with a #-shaped support frame, and each intersection of the lower end face of the #-shaped support frame is fixedly connected with a support arm. The shrinkage block is arranged to form the local cavity, the problem of casting size deviation caused by the fact that the sand mold hinders solidification of molten iron is solved, the casting size can easily meet the design requirement, and the shrinkage block keeps a gap of 20 mm or above with other parts during molding, so that on one hand, in the sand mold manufacturing and molten iron pouring process, the shrinkage block is not prone to deformation; on the one hand, the phenomenon that the local part of the sand mold is damaged due to extrusion of the shrinkage block or impact during molten iron pouring can be prevented, molten iron is prevented from being poured into the shrinkage block too early, and normal formation of a sand mold cavity is ensured; and a space can be provided for shrinkage of molten iron.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a molding method for preventing a blank holder ring from deforming. Background Art

[0002] The automobile stamping die system is a complex, highly integrated tooling system designed for the stamping of automobile parts. It is a key link in the automobile manufacturing process. Its performance and quality directly affect the precision, quality and production efficiency of automobile parts. The automobile stamping die blank holder is an extremely critical component in the automobile stamping die system. It has a specific frame structure and plays an indispensable role in the stamping production process of automobile parts.

[0003] At present, in the casting process of the blank holder of automobile stamping die, due to the characteristics of thermal expansion and contraction of molten iron, three-dimensional enlargement processing during model making is a common operation, which aims to ensure that the size of the casting after pouring and solidification can accurately meet the design requirements. However, after the sand is buried, the whole dense sand mold formed in the middle area of ​​the frame structure of the blank holder seriously interferes with the normal solidification process of the molten iron, making it difficult to control the final size of the casting. At the same time, the frame structure itself has poor stability and is prone to diagonal deformation before sand burying. This not only affects the molding quality of the sand mold, but also further affects the subsequent molten iron pouring and solidification stage, resulting in a series of quality problems such as casting shape deviation and uneven size, which greatly reduces the casting qualification rate and performance reliability of the blank holder. Summary of the invention

[0004] The purpose of the present invention is to provide a molding method for preventing the blank holder from deforming, so as to solve the above-mentioned deficiencies in the technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a molding method for preventing deformation of a blank holder ring, comprising a blank holder ring body, the inner surface wall of the blank holder ring body is connected with a criss-cross support frame, the criss-cross support frame helps to guide the solidification and shrinkage direction of the molten iron so that the casting does not undergo diagonal deformation, the cross-sectional size of the criss-cross support frame is above 60*60mm, each intersection of the lower end face of the criss-cross support frame is fixedly connected with a support arm, the lower end face of the blank holder ring body is connected with a push rod connecting plate, the thickness of the push rod connecting plate is above 30mm, and four shrinkage blocks are symmetrically arranged at each intersection of the criss-cross support frame, the gap between the shrinkage block and the blank holder ring body, the criss-cross support frame, and the push rod connecting plate is above 20mm, and the size of the shrinkage block is 200*200*200mm.

[0006] Preferably, the lower end surface of the support arm is flush with the lower end surface of the top rod connecting plate, which can ensure that before shaping, the tic-tac-toe support frame will not break or fall off due to being suspended in the air. The shrinkage block is arranged inside the pressure ring body, and the pressure ring body, the tic-tac-toe support frame, the support arm, the top rod connecting plate and the shrinkage block are all made of foam material.

[0007] Specifically, first, when the blank holder body is manufactured, the criss-cross support frame and the push rod connecting plate are manufactured together with the body. Before the blank holder body is transmitted downward, the joint positions with the criss-cross support frame and the push rod connecting plate are reinforced in place to prevent breakage and falling off before molding. During molding, the shrinkage block is placed, and the shrinkage block can prevent local damage to the sand mold. When molten iron is poured, the shrinkage block is poured into the position of the shrinkage block. After molding and pouring are completed, the shrinkage block melts in the high-temperature molten iron, and a local cavity is formed in the sand mold. During the cooling and solidification process of the molten iron, it shrinks. Due to the local cavity in the sand mold, the sand mold can be squeezed and damaged during solidification and shrinkage, making it easier to cast to a compliant size.

[0008] Preferably, a limiting structure is provided on the outside of the pressure ring body, and the limiting structure includes a horizontal plate arranged at the upper end of the pressure ring body, and the lower end surface of the horizontal plate is symmetrically fixedly connected with side plates on both sides, and the lower end surface of the horizontal plate and the upper end of the shrinkage block are connected with a fixed plate.

[0009] Preferably, the lower end surface of the fixed plate is fixedly connected to a fixed column, the interior of the fixed column is connected to a T-shaped movable column, the lower end surface of the T-shaped movable column is fixedly connected to an insert block, the outside of the insert block is provided with a connecting block, and the upper end surface of the connecting block is provided with a slot adapted to the insert block.

[0010] Preferably, the connecting block is fixedly connected to the shrinking block, a T-shaped connecting rod is inserted into the interior of the fixed column, a spring is sleeved outside the T-shaped connecting rod and inside the fixed column, and the free end of the spring and one end of the T-shaped connecting rod are connected to the T-shaped movable column.

[0011] Preferably, the protruding end of the T-shaped connecting rod passes through and extends to the upper end of the fixed plate, the upper end surface of the fixed plate is provided with an embedding groove, the outer walls of the plug block and the protruding end of the T-shaped connecting rod are respectively fixedly connected with embedding blocks, the outside of the embedding block and the inner walls of the fixed plate and the connecting block are respectively provided with card grooves used in conjunction with the embedding block, and the upper end of the card groove is provided with an open groove.

[0012] Through the above technical solution:

[0013] When placing the shrinkage block, first insert the slot opened in the connecting block into the outside of the insert block connected to the T-shaped movable column, then manually press the T-shaped connecting rod downward, and use the elastic force of the spring to drive the T-shaped movable column to descend, so that the protruding end of the T-shaped connecting rod is embedded in the inside of the embedding groove, thereby driving the shrinkage block to descend, and finally screw the protruding end of the T-shaped connecting rod to screw the embedding block from one end of the slot to the other end of the slot to fix the position of the T-shaped movable column after it is lowered. This operation can ensure that the shrinkage block is accurately placed in the predetermined position, so that the gap between the shrinkage block and the pressure ring body, the well-shaped support frame and the top rod connecting plate can be strictly maintained at more than 20 mm, and there is It can effectively avoid position deviation caused by placement error or external force interference. When a part of molten iron is poured and the depth of molten iron is lower than the shrinkage block, it can effectively resist the buoyancy, impact force and flow interference of molten iron to prevent the shrinkage block from shifting. Secondly, it also ensures the stability of the position of the shrinkage block, so that the formation position and size of the sand mold cavity are more accurate. During the cooling and solidification process of molten iron, the precise cavity can guide the molten iron to shrink in a predetermined direction, thereby improving the dimensional accuracy of the casting, helping the molten iron to dissipate heat and shrink evenly during the solidification process, avoiding local heat transfer abnormalities and uneven shrinkage caused by the movement of the shrinkage block, thereby reducing the stress concentration inside the casting, making the casting less prone to defects such as deformation and cracks after cooling, and improving the quality and reliability of the casting.

[0014] Preferably, a connecting structure is provided at the connection between the limiting structure and the pressure ring body, and the connecting structure includes a threaded rod threadedly connected to the side panel, one end of the threaded rod is movably connected to a connecting disk, the end of the connecting disk away from the connecting disk is connected to a clamping block, the other end of the threaded rod is connected to an end block, and the end block is arranged on the outside of the side panel.

[0015] Preferably, a snap ring block is embedded in the outer wall of the pressure ring body, and a hole groove matched with the snap ring block is opened at the end of the snap ring block.

[0016] Specifically, after the molten iron is poured to the position of the criss-cross support frame and contacts the shrinkage block to release the connection with the limiting structure, the end block is then held and twisted to drive the threaded rod to rotate, so that the clamping block moves out of the hole groove opened by the clamping ring block, and the limiting structure can be removed from the blank holder body, which can prevent the limiting structure from being deformed or damaged due to continuous heat during the subsequent casting process, thereby ensuring the reusability of the limiting structure. Secondly, it can reduce the space it occupies inside the mold, and provide a smoother and wider spatial environment for the further flow, solidification and shrinkage of the molten iron in the blank holder body, which is conducive to the molten iron to evenly fill all corners of the mold cavity, making the overall casting quality of the blank holder more stable and reliable, reducing local casting defects caused by space obstacles, such as looseness, shrinkage holes, etc., thereby improving the performance and working reliability of the blank holder in subsequent automobile stamping processes, and extending its service life.

[0017] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0018] 1. By setting the shrinkage block to form a local cavity, the problem of casting size deviation caused by the sand mold hindering the solidification of molten iron is solved, making it easier for the casting size to meet the design requirements. The shrinkage block maintains a gap of more than 20mm with other components during molding. On the one hand, during the sand mold making and molten iron pouring process, it can prevent the sand mold from being damaged due to the extrusion of the shrinkage block or the impact during the molten iron pouring, and avoid the molten iron from pouring into the shrinkage block position too early, ensuring the normal formation of the sand mold cavity. On the other hand, under the action of high-temperature molten iron, the shrinkage block melts to form a local cavity. This cavity can provide space for the shrinkage of the molten iron during the cooling, solidification and shrinkage of the molten iron, so that the sand mold has a certain amount of concession when being squeezed, avoiding excessive resistance to the shrinkage of the casting, so that the casting is easier to reach the compliant size, and the controllability of the casting size accuracy is improved;

[0019] 2. By setting up a well-shaped support frame, the solidification and shrinkage direction of the molten iron can be effectively guided, and the diagonal deformation of the blank holder ring body during the solidification process can be prevented, thereby improving the quality of the casting. Secondly, the well-shaped support frame forms a relatively uniform heat conduction path and structural support frame inside the blank holder ring body, so that the shrinkage of various parts of the molten iron during solidification is more coordinated and consistent, reducing the stress concentration and deformation caused by uneven local shrinkage, ensuring the shape accuracy and structural stability of the casting, and improving the overall quality and performance reliability of the blank holder ring;

[0020] 3. By setting the support arm, and the support arm is flush with the top rod connecting plate, the uneven force of the well-shaped support frame due to suspension is avoided, and the stability of the well-shaped support frame is enhanced, so that it can better bear its own weight and the pressure from the sand mold before molding. During the sand mold filling process, the well-shaped support frame will not break or fall off due to local stress concentration caused by suspension, which ensures the structural integrity of the sand mold cavity, which is conducive to the formation of castings with precise size and complete shape after molten iron pouring;

[0021] 4. By using foam to make the blank holder body, tic-tac-toe support, push rod connecting plate and shrinkage block, the characteristics of foam material, such as light weight and easy processing and molding, are utilized to facilitate the shaping and assembly of various components during the manufacturing process. When the blank holder body is produced, the tic-tac-toe support and push rod connecting plate are made at the same time, and the joint position is reinforced in place before the body is transmitted down, which effectively prevents these components from breaking and falling off due to external force before molding. During the transportation and sand mold making process, the reinforced structure can withstand certain collisions and vibrations, ensuring the integrity of the entire blank holder body, and laying the foundation for subsequent precise molding and pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the present invention after the shrinkage block is placed;

[0025] Figure 3 It is a schematic diagram of the connection between the limiting structure and the blank holder body of the present invention;

[0026] Figure 4 It is a schematic diagram of the separation of the limiting structure and the blank holder body of the present invention;

[0027] Figure 5 It is an enlarged schematic diagram of the connection between the fixed plate, the fixed column and the T-shaped movable column of the present invention;

[0028] Figure 6 This is a schematic diagram of releasing the limit connection of the shrink block of the present invention;

[0029] Figure 7 It is an enlarged schematic diagram of the connection structure of the present invention.

[0030] Description of reference numerals:

[0031] 1. The pressure ring body; 2. The cross-shaped support frame; 3. The support arm; 4. The top rod connecting plate; 5. The shrinkage block; 6. The limiting structure; 61. The horizontal plate; 62. The side plate; 63. The fixed plate; 64. The fixed column; 611. The T-shaped movable column; 612. The spring; 613. The T-shaped connecting rod; 614. The embedded groove; 615. The plug-in block; 616. The connecting block; 617. The slot; 7. The connecting structure; 71. The threaded rod; 72. The connecting plate; 73. The clamping block; 74. The clamping ring block; 75. The end block. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The present invention provides Figure 1-Figure 4 A molding method for preventing a blank holder from deforming as shown, comprising:

[0034] A blank holder body 1, the inner surface wall of the blank holder body 1 is connected with a tic-tac-toe support frame 2, the tic-tac-toe support frame 2 helps to guide the solidification and shrinkage direction of the molten iron so that the casting does not undergo diagonal deformation, the cross-sectional size of the tic-tac-toe support frame 2 is more than 60*60mm, and the lower end faces of the tic-tac-toe support frame 2 are fixedly connected with support arms 3, the lower end face of the blank holder body 1 is connected with a push rod connecting plate 4, the thickness of the push rod connecting plate 4 is more than 30mm, and four shrinkage blocks 5 are symmetrically arranged at each intersection of the tic-tac-toe support frame 2, the gap between the shrinkage block 5 and the blank holder body 1, the tic-tac-toe support frame 2, and the push rod connecting plate 4 is more than 20mm, and the size of the shrinkage block 5 is 200*200*200mm;

[0035] The lower end surface of the support arm 3 is flush with the lower end surface of the top rod connecting plate 4, which can ensure that before shaping, the criss-cross support frame 2 will not break or fall off due to being suspended in the air. The shrinkage block 5 is arranged inside the pressure ring body 1. The pressure ring body 1, the criss-cross support frame 2, the support arm 3, the top rod connecting plate 4 and the shrinkage block 5 are all made of foam material.

[0036] Specifically, first, when the blank holder body 1 is manufactured, a criss-cross support frame 2 and a push rod connecting plate 4 are manufactured together with the body. Before the blank holder body 1 is transmitted downward, the joint position with the criss-cross support frame 2 and the push rod connecting plate 4 is reinforced in place to prevent breakage or falling off before molding. During molding, a shrinkage block 5 is placed. The shrinkage block 5 can prevent local damage to the sand mold. When molten iron is poured, the shrinkage block 5 is poured into the position. After molding and pouring are completed, the shrinkage block 5 melts in the high-temperature molten iron, and a local cavity is formed in the sand mold. During the cooling and solidification process of the molten iron, it shrinks. Due to the local cavity in the sand mold, the sand mold can be squeezed and damaged during solidification and shrinkage, making it easier for the casting to reach a compliant size.

[0037] The present invention provides Figure 3-Figure 6 A shaping method for preventing a blank holder ring from deforming is shown, wherein a limiting structure 6 is provided on the outside of the blank holder ring body 1, and the limiting structure 6 includes a horizontal plate 61 provided on the upper end of the blank holder ring body 1, and side plates 62 are symmetrically fixedly connected to the lower end surface of the horizontal plate 61 on both sides, and a fixed plate 63 is connected to the lower end surface of the horizontal plate 61 and located at the upper end of the shrinkage block 5.

[0038] The lower end face of the fixed plate 63 is fixedly connected to a fixed column 64, the interior of the fixed column 64 is connected to a T-shaped movable column 611, the lower end face of the T-shaped movable column 611 is fixedly connected to an insert block 615, the outside of the insert block 615 is provided with a connecting block 616, and the upper end face of the connecting block 616 is provided with a slot 617 adapted to the insert block 615.

[0039] The connecting block 616 is fixedly connected to the shrinking block 5, a T-shaped connecting rod 613 is inserted into the interior of the fixed column 64, a spring 612 is sleeved outside the T-shaped connecting rod 613 and inside the fixed column 64, and the free end of the spring 612 and one end of the T-shaped connecting rod 613 are connected to the T-shaped movable column 611.

[0040] The protruding end of the T-shaped connecting rod 613 passes through and extends to the upper end of the fixed plate 63. The upper end surface of the fixed plate 63 is provided with an embedding groove 614. The outer wall of the plug block 615 and the protruding end of the T-shaped connecting rod 613 are respectively fixedly connected with the embedding blocks. The outside of the embedding block and the inner wall of the fixed plate 63 and the connecting block 616 are respectively provided with a slot used in conjunction with the embedding block, and the upper end of the slot is provided with an open groove.

[0041] Through the above technical solution:

[0042] When placing the shrink block 5, first insert the slot 617 provided in the connecting block 616 into the outside of the insert block 615 connected to the T-shaped movable column 611, then manually press down the T-shaped connecting rod 613, and use the elastic force of the spring 612 to drive the T-shaped movable column 611 to descend, so that the protruding end of the T-shaped connecting rod 613 is embedded in the inside of the embedding groove 614, so as to drive the shrink block 5 to descend, and finally screw the protruding end of the T-shaped connecting rod 613 to screw the embedding block from one end of the slot to the other end of the slot, and fix the position of the T-shaped movable column 611 after it is descended. This operation can ensure that the shrink block 5 is accurately placed in the predetermined position, so that the gap between the shrink block 5 and the pressure ring body 1, the well-shaped support frame 2 and the top rod connecting plate 4 can be strictly maintained at 20 mm. As described above, position deviation caused by placement error or external force interference is effectively avoided. When a portion of molten iron is poured and the depth of the molten iron is lower than the shrinkage block 5, it can effectively resist the buoyancy, impact force and flow interference of the molten iron to prevent the shrinkage block 5 from shifting. Secondly, the stability of the position of the shrinkage block 5 is also guaranteed, so that the formation position and size of the sand mold cavity are more accurate. During the cooling and solidification process of the molten iron, the precise cavity can guide the molten iron to shrink in a predetermined direction, thereby improving the dimensional accuracy of the casting, and helping the molten iron to dissipate heat and shrink evenly during the solidification process, avoiding local heat transfer abnormalities and uneven shrinkage caused by the movement of the shrinkage block 5, thereby reducing the stress concentration inside the casting, making the casting less prone to defects such as deformation and cracks after cooling, thereby improving the quality and reliability of the casting.

[0043] Further, see Figure 4 and Figure 7 As shown, a connecting structure 7 is provided at the connection between the limiting structure 6 and the pressure ring body 1, and the connecting structure 7 includes a threaded rod 71 threadedly connected to the side plate 62, one end of the threaded rod 71 is movably connected to a connecting disk 72, the end of the connecting disk 72 away from the connecting disk 72 is connected to a clamping block 73, and the other end of the threaded rod 71 is connected to an end block 75, and the end block 75 is arranged on the outer side of the side plate 62.

[0044] A snap ring block 74 is embedded in the outer wall of the blank holder body 1 , and a hole groove matched with the snap ring block 73 is formed at the end of the snap ring block 74 .

[0045] Specifically, after the molten iron is poured to the position of the cross-shaped support frame 2 and the contact shrinkage block 5 is disconnected from the limiting structure 6, the end block 75 is then held and screwed to drive the threaded rod 71 to rotate, so that the clamping block 73 moves out of the hole groove opened by the clamping ring block 74, and the limiting structure 6 can be removed from the blank holder body 1, which can prevent the limiting structure 6 from being deformed or damaged due to continuous heating during the subsequent casting process, thereby ensuring the reusability of the limiting structure 6. Secondly, it can reduce the space it occupies inside the mold, and provide a smoother and wider spatial environment for the further flow, solidification and shrinkage of the molten iron in the blank holder body 1, which is conducive to the molten iron evenly filling all corners of the mold cavity, making the overall casting quality of the blank holder more stable and reliable, reducing local casting defects caused by space obstacles, such as looseness, shrinkage holes, etc., thereby improving the performance and working reliability of the blank holder in subsequent automobile stamping processes, and extending its service life.

[0046] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A molding method for preventing the blank holder from deforming, characterized in that: include: A blank holder ring body (1), the inner surface wall of the blank holder ring body (1) is connected to a tic-tac-toe-shaped support frame (2), each intersection of the lower end surface of the tic-tac-toe-shaped support frame (2) is fixedly connected to a support arm (3), the lower end surface of the blank holder ring body (1) is connected to a push rod connecting plate (4), and four contraction blocks (5) are symmetrically provided at each intersection of the tic-tac-toe-shaped support frame (2); The lower end surface of the support arm (3) is flush with the lower end surface of the push rod connecting plate (4); the shrinkage block (5) is arranged inside the pressure ring body (1); the pressure ring body (1), the well-shaped support frame (2), the support arm (3), the push rod connecting plate (4) and the shrinkage block (5) are all made of foam material.

2. A molding method for preventing the blank holder from deforming according to claim 1, characterized in that: A limiting structure (6) is provided on the outside of the pressure ring body (1), and the limiting structure (6) includes a horizontal plate (61) provided on the upper end of the pressure ring body (1), and the lower end surface of the horizontal plate (61) is symmetrically fixedly connected with side plates (62) on both sides, and the lower end surface of the horizontal plate (61) and the upper end of the shrinkage block (5) are connected with a fixed plate (63).

3. A molding method for preventing the blank holder from deforming according to claim 2, characterized in that: The lower end surface of the fixed plate (63) is fixedly connected to a fixed column (64), the interior of the fixed column (64) is connected to a T-shaped movable column (611), the lower end surface of the T-shaped movable column (611) is fixedly connected to an insert block (615), the outside of the insert block (615) is provided with a connecting block (616), and the upper end surface of the connecting block (616) is provided with a slot (617) adapted to the insert block (615).

4. A molding method for preventing the blank holder from deforming according to claim 3, characterized in that: The connecting block (616) is fixedly connected to the contraction block (5); a T-shaped connecting rod (613) is inserted into the interior of the fixed column (64); a spring (612) is sleeved outside the T-shaped connecting rod (613) and inside the fixed column (64); the free end of the spring (612) and one end of the T-shaped connecting rod (613) are connected to the T-shaped movable column (611).

5. A molding method for preventing the blank holder from deforming according to claim 4, characterized in that: The protruding end of the T-shaped connecting rod (613) penetrates and extends to the upper end of the fixing plate (63); the upper end surface of the fixing plate (63) is provided with an embedding groove (614); the outer wall of the insert block (615) and the protruding end of the T-shaped connecting rod (613) are respectively fixedly connected with the embedding block; the outside of the embedding block and the inner wall of the fixing plate (63) and the connecting block (616) are respectively provided with a clamping groove used in conjunction with the embedding block; the upper end of the clamping groove is provided with an open groove.

6. A molding method for preventing the blank holder from deforming according to claim 5, characterized in that: A connecting structure (7) is provided at the connection between the limiting structure (6) and the pressure ring body (1), and the connecting structure (7) includes a threaded rod (71) threadedly connected to the side plate (62), one end of the threaded rod (71) is movably connected to a connecting disk (72), one end of the connecting disk (72) away from the connecting disk (72) is connected to a clamping block (73), and the other end of the threaded rod (71) is connected to an end block (75), and the end block (75) is arranged on the outer side of the side plate (62).

7. A molding method for preventing the blank holder from deforming according to claim 6, characterized in that: A snap ring block (74) is embedded in the outer wall of the pressure ring body (1), and a hole groove matching the snap ring block (73) is opened at the end of the snap ring block (74).

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