Wear-resistant structure of a mold

Abstract

The application provides a wear-resistant structure of a mold, and belongs to the technical field of molds. The technical problem of bolt fracture and falling in the existing wear-resistant structure of a mold is solved. The wear-resistant structure of the mold comprises a wear-resistant sheet, a fastening bolt and a positioning pin. The wear-resistant sheet has an installation hole in the middle. The fastening bolt comprises a head and a screw rod. The screw rod passes through the installation hole and is fixed to the mold. The positioning pin is arranged in parallel with the fastening bolt. One end of the positioning pin is fixed to the wear-resistant sheet. The mold has a plug hole. The other end of the positioning pin is inserted into the plug hole. The gap size between the outer periphery of the screw rod and the inner wall of the installation hole is smaller than the gap size between the outer periphery of the positioning pin and the inner wall of the plug hole. The application can effectively avoid the bolt fracture and falling into the mold cavity.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a wear-resistant structure of a mold. Background Art

[0002] In mold design, especially for large parts, these molds are difficult to machine and expensive to replace. Therefore, wear-resistant plates are often designed in areas such as the jaws to extend the mold's life. After wear, only the plate needs to be replaced, reducing maintenance and replacement costs. However, wear-resistant plates are typically secured with fastening bolts. Under the loads of mold production, these bolts are susceptible to shear loads and breakage, causing them to fall into the mold and affect production.

[0003] The patent with authorization announcement number CN202667267U discloses a roughing mill main shaft flat head sleeve wear-resistant plate positioning device, which is characterized in that it includes a flat head sleeve, a wear-resistant plate, bolts, and positioning pins. The wear-resistant plate is fixed to the flat head sleeve by 4 bolts and 2 positioning pins.

[0004] The above-mentioned device increases the connection strength between the flat head sleeve and the wear-resistant plate by setting multiple bolts and locating pins to reduce the probability of bolt breakage, but the bolts may still break and fall into the mold. In order to solve the above problems, general technicians in this field may more easily consider the following: 1. Setting higher strength bolts to connect the wear-resistant plate and the mold to make it difficult for the bolts to break; 2. Adding an additional covering structure to the wear-resistant plate to seal the bolts inside. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention provides a wear-resistant structure of a mold. The technical problem to be solved by the present invention is: how to prevent the bolt from falling when it breaks.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A wear-resistant structure of a mold, the wear-resistant structure includes a wear-resistant plate, a fastening bolt and a positioning pin, the wear-resistant plate has a mounting hole in the middle, the fastening bolt includes a head and a screw, the screw passes through the mounting hole and is fixedly connected to the mold, the positioning pin is arranged parallel to the fastening bolt, and is characterized in that one end of the positioning pin is fixedly connected to the wear-resistant plate, the mold has a socket, the other end of the positioning pin is inserted into the socket, and the gap size between the outer periphery of the screw and the inner wall of the mounting hole is smaller than the gap size between the outer periphery of the positioning pin and the inner wall of the socket.

[0008] The wear-resistant sheet is mostly arranged obliquely at the friction position of the mold opening and closing, which can reduce the wear of the mold itself during the production process and improve the life of the mold. The screw of the fastening bolt passes through the mounting hole to accurately fix the wear-resistant sheet on the mold. The positioning pin is arranged parallel to the fastening bolt and inserted into the mold to assist in positioning the wear-resistant sheet; by setting one end of the positioning pin to be fixed to the wear-resistant sheet, and the other end of the positioning pin to be inserted into the socket, and making the gap between the outer periphery of the screw and the inner wall of the mounting hole smaller than the gap between the outer periphery of the positioning pin and the inner wall of the socket, when the screw bears the impact load on the wear-resistant sheet, the gap between the outer periphery of the positioning pin and the inner wall of the socket is less than the gap between the outer periphery of the positioning pin and the inner wall of the socket. There is no contact between the two, that is, the locating pin does not bear any load under normal conditions, and at the same time, the movement of the entire wear-resistant sheet will directly drive the movement of the locating pin. When the screw is subjected to shear load and breaks, the movement space of the wear-resistant sheet is constrained by the jack due to the locating pin, avoiding large-scale movement of the wear-resistant sheet. At the same time, since the locating pin has never been subjected to shear load before, its shape is guaranteed to be stable, and the wear-resistant sheet is firmly connected to one end of the locating pin, so that the wear-resistant sheet will not flip over, so that the broken fastening bolt can always be stably maintained on the wear-resistant sheet, avoiding the fastening bolt from suddenly breaking and falling into the mold cavity to cause production accidents.

[0009] In the aforementioned mold's wear-resistant structure, the wear-resistant sheet is a rectangular, long plate and is arranged horizontally on the mold. The outer periphery of the locating pin, near the lower edge of the wear-resistant sheet, has a flat surface parallel to the lower edge of the sheet. This allows the wear-resistant sheet to move downward without the restraint of the bolt if the fastening bolt breaks. Because the radial dimension of the socket is larger than that of the locating pin, the flat surface on the locating pin increases the stability of the locating pin's support against the inner wall of the socket, minimizing the lateral movement of the wear-resistant sheet after downward movement and ensuring the stable position of the broken fastening bolt.

[0010] In the wear-resistant structure of the mold described above, the length of the locating pin extending from the locating hole is greater than the length of the screw extending from the mounting hole. Thus, if the fastening bolt breaks, even if the wear-resistant plate is subjected to vertical pressure load, the longer locating pin will, with the end of the socket serving as a fulcrum, cause the angle of the wear-resistant plate to change very slightly after the other end of the locating pin abuts against the inner wall of the socket. This means that the wear-resistant plate's tilting angle will be smaller, ensuring that the broken fastening bolt will not fall off the wear-resistant plate.

[0011] In the wear-resistant structure of the mold, the radial dimension of the positioning pin is larger than the radial dimension of the screw. This helps ensure that the positioning pin can bear sufficient load when the wear-resistant sheet is affected by load, ensuring that the state can be maintained stable before maintenance.

[0012] In the aforementioned mold's wear-resistant structure, there are at least two mounting holes and two fastening bolts. These fastening bolts are spaced apart along the length of the wear plate, and the locating pins are located between adjacent fastening bolts. This allows the wear plate to be fastened in the same horizontal direction by multiple fastening bolts, facilitating the distribution of vertical loads. Even if one fastening bolt breaks, the remaining fastening bolts ensure the overall positional stability of the wear plate, preventing the broken fastening bolt from falling.

[0013] In the aforementioned mold's wear-resistant structure, the positioning pin is positioned adjacent to the fastening bolt. Thus, when the fastening bolt breaks, the wear-resistant sheet's position changes the most at that location, and the positioning pin provides support nearby, thereby preventing the wear-resistant sheet from excessively moving and potentially causing the broken fastening bolt to fall off.

[0014] In the aforementioned mold's wear-resistant structure, the wear-resistant sheet has a groove on the side facing away from the mold, directly opposite and connected to the mounting hole. The groove has a larger radial dimension than the mounting hole. The mounting hole is located on the bottom surface of the groove, and the head is located within the groove and abuts against the bottom surface. This allows the head to be hidden within the groove, preventing the head of the fastening bolt from scratching the mold during production.

[0015] In the aforementioned mold's wear-resistant structure, the inner wall of the mounting hole, near the lower side of the wear-resistant plate, has a clearance notch. The screw can be positioned and embedded in the clearance notch while the outer peripheral surface of the head abuts against the inner wall of the receiving groove. In this way, if the screw breaks, the portion of the screw connected to the head can be positioned downward into the clearance notch, while the head is supported on the inner wall of the receiving groove. This allows the wear-resistant plate to maintain a stable position of the broken fastening bolt within the receiving groove and positioning hole, significantly reducing the probability of the broken fastening bolt falling due to external forces.

[0016] In the aforementioned mold's wear-resistant structure, the wear-resistant sheet has a strip-shaped oil groove on the side facing away from the mold. This allows the inner wall of the oil groove to be coated with oil, which can absorb iron powder generated by friction to a certain extent, preventing it from intruding and scratching the product or connection points.

[0017] In the wear-resistant structure of the mold, the oil groove is provided along the length of the wear-resistant sheet and below the positioning hole, which helps to increase the effective range of the oil groove in absorbing friction iron powder at various locations on the wear-resistant sheet.

[0018] Compared with the prior art, the advantages of the present invention are as follows:

[0019] In the wear-resistant structure of this mold, when the screw bears the impact load of the wear-resistant plate, there is no contact between the outer periphery of the locating pin and the inner wall of the socket, that is, the locating pin does not bear the load under normal conditions, and at the same time, the movement of the entire wear-resistant plate will directly drive the movement of the locating pin. When the screw is subjected to shear load and breaks, the movement space of the wear-resistant plate is constrained by the locating pin and the socket, avoiding large-scale movement of the wear-resistant plate. At the same time, since the locating pin has never been subjected to shear load before, its shape is guaranteed to be stable, and the wear-resistant plate is fixedly connected to one end of the locating pin, so that the wear-resistant plate will not flip over, so that the broken fastening bolt can always be stably maintained on the wear-resistant plate, avoiding the fastening bolt from suddenly breaking and falling into the mold cavity to cause production accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the wear-resistant plate, the fastening bolt and the positioning pin in the first embodiment.

[0021] Figure 2 It is a schematic cross-sectional structural diagram of embodiment 1.

[0022] Figure 3 yes Figure 2 Enlarged view of part A in .

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the wear-resistant plate, the fastening bolt and the positioning pin in embodiment 1 from another angle.

[0024] Figure 5 It is a front view of the wear-resistant plate in Example 1.

[0025] Figure 6 It is a rear view of the matching structure of the wear-resistant plate, the fastening bolt and the positioning pin in the second embodiment.

[0026] Figure 7 yes Figure 6 Enlarged view of part B in .

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the fastening bolt in the second embodiment.

[0028] In the figure, 1, wear-resistant sheet; 11, mounting hole; 111, clearance notch; 12, positioning hole; 13, receiving groove; 14, oil tank;

[0029] 2. Mold; 21. Jack;

[0030] 3. Fastening bolt; 31. Head; 32. Screw;

[0031] 4. Positioning pin; 41. Flat section. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0033] Example 1:

[0034] like Figure 1-5As shown, the wear-resistant structure of the mold includes a wear-resistant plate 1, a fastening bolt 3 and a positioning pin 4. The wear-resistant plate 1 can be made of existing wear-resistant material, and the basic structure of the mold 2 can be existing technology. The wear-resistant plate 1 has a mounting hole 11 and a positioning hole 12 in the middle part, and the fastening bolt 3 is perpendicular to the wear-resistant plate 1. The fastening bolt 3 is inserted in the mounting hole 11 and fixes the wear-resistant plate 1 to the mold 2. The fastening bolt 3 includes a head 31 and a screw 32. The positioning pin 4 is arranged parallel to the fastening bolt 3. One end of the positioning pin 4 is fixed in the positioning hole 12. The mold 2 has a socket 21 arranged opposite to the positioning hole 12. The other end of the positioning pin 4 is inserted in the socket 21. The gap size between the outer periphery of the screw 32 and the inner wall of the mounting hole 11 is smaller than the gap size between the outer periphery of the positioning pin 4 and the inner wall of the socket 21. The wear-resistant sheet 1 is arranged obliquely at the friction position of the tiger's mouth when the mold 2 is opened and closed. The outer surface of the wear-resistant sheet 1 is inclined upward. The wear-resistant sheet 1 can reduce the wear of the mold 2 itself during the production process and improve the life of the mold 2. The fastening bolt 3 passes through the mounting hole 11 to accurately fix the wear-resistant sheet 1 on the mold 2. The positioning pin 4 passes through the positioning hole 12 and is arranged parallel to the fastening bolt 3 and inserted into the mold 2 to assist in positioning the wear-resistant sheet 1; by setting one end of the positioning pin 4 to be fixed in the positioning hole 12, the other end of the positioning pin 4 is inserted in the socket 21, and the gap size between the outer periphery of the screw 32 and the inner wall of the mounting hole 11 is smaller than the gap size between the outer periphery of the positioning pin 4 and the inner wall of the socket 21, so that the screw 32 can bear the impact of the wear-resistant sheet 1. When the load is applied, there is no contact between the outer periphery of the locating pin 4 and the inner wall of the socket 21, that is, the locating pin 4 will not bear the load under normal conditions, and at the same time, the movement of the entire wear-resistant plate 1 will directly drive the movement of the locating pin 4. When the screw 32 is subjected to the shear load and breaks, the movement space of the wear-resistant plate 1 is constrained by the socket 21 due to the locating pin 4, avoiding the wear-resistant plate 1 from making large movements. At the same time, since the locating pin 4 has never been subjected to the shear load before, its shape is guaranteed to be stable, and the wear-resistant plate 1 is fixedly connected to one end of the locating pin 4, so that the wear-resistant plate 1 will not flip over, so that the broken fastening bolt 3 can always be stably maintained on the wear-resistant plate 1, avoiding the fastening bolt 3 from suddenly breaking and falling into the mold 2 cavity to cause a production accident. Specifically, the wear-resistant plate 1 is in the shape of a rectangular long plate and is arranged horizontally on the mold 2. The outer periphery of the locating pin 4 has a flat cut surface 41 on the side close to the lower length side of the wear-resistant plate 1, and the flat cut surface 41 is parallel to the lower length side of the wear-resistant plate 1. In this way, when the fastening bolt 3 breaks, the wear-resistant plate 1 loses the restraint of the fastening bolt 3 and moves downward. Since the radial dimension of the insertion hole 21 is larger than the radial dimension of the positioning pin 4, the flat cut surface 41 on the positioning pin 4 can increase the stability of the positioning pin 4 on the inner wall of the insertion hole 21, which helps to reduce the lateral movement space of the wear-resistant plate 1 after downward movement, and ensures the stable position of the broken fastening bolt 3. The length of the positioning pin 4 extending from the positioning hole 12 is nearly twice the length of the screw 32 extending from the mounting hole 11.In this way, when the fastening bolt 3 breaks, even if the wear-resistant plate 1 is subjected to a vertical pressure load, due to the long length of the locating pin 4, with the end of the socket 21 as the fulcrum, the other end of the locating pin 4 will be against the inner wall in the socket 21, and the change in the angle of the wear-resistant plate 1 will be very small, that is, the flipping angle of the wear-resistant plate 1 will be smaller, ensuring that the broken fastening bolt 3 will not fall from the wear-resistant plate 1. The radial dimension of the locating pin 4 is larger than the radial dimension of the screw 32. This is conducive to ensuring that the locating pin 4 can bear sufficient load when the wear-resistant plate 1 is affected by the load, and ensuring that the state can be maintained stable before maintenance. The side surface of the wear-resistant plate 1 away from the mold 2 has a receiving groove 13 that is directly connected to the mounting hole 11. The radial dimension of the receiving groove 13 is larger than the radial dimension of the mounting hole 11. The mounting hole 11 is located on the bottom surface of the receiving groove 13, and the head 31 is located in the receiving groove 13 and is against the bottom surface of the receiving groove 13. In this way, the head 31 can be hidden in the accommodating groove 13 , thereby preventing the head 31 of the fastening bolt 3 from scratching the mold 2 during the production process of the mold 2 .

[0035] like Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 As shown, there are three mounting holes 11 and three fastening bolts 3, and two locating pins 4. The fastening bolts 3 are spaced apart along the length of the wear-resistant plate 1, with the locating pins 4 located between adjacent fastening bolts 3. This allows the wear-resistant plate 1 to be secured in the same horizontal direction by multiple fastening bolts 3, which helps distribute the vertical load. Even if a fastening bolt 3 breaks, the other fastening bolts 3 can maintain the overall positional stability of the wear-resistant plate 1, thereby preventing the broken fastening bolt 3 from falling. The locating pins 4 are arranged adjacent to the fastening bolts 3 near the ends of the wear-resistant plate 1. In this way, when a fastening bolt 3 breaks, the position and size of the wear-resistant plate 1 at these ends change the most, and the locating pins 4 provide support nearby, thereby preventing the wear-resistant plate 1 from excessive displacement and causing the broken fastening bolt 3 to fall. The surface of the wear-resistant plate 1 facing away from the mold 2 has a strip-shaped oil groove 14. The inner wall of the oil groove 14 can be coated with oil, which can absorb iron powder generated by friction to a certain extent, preventing the iron powder from invading and scratching the product or connection points. The oil groove 14 is provided along the length direction of the wear-resistant sheet 1 and is located below the positioning hole 12. This is conducive to increasing the range of the oil groove 14 to absorb friction iron powder on various parts of the wear-resistant sheet 1, and is conducive to making the iron powder falling from the top be absorbed by the inner wall of the oil groove 14 as much as possible.

[0036] Example 2:

[0037] like Figure 6-8As shown, this embodiment is basically the same as the first embodiment, except that: the inner wall of the mounting hole 11 has a clearance notch 111 on one side of the length side near the lower side of the wear-resistant plate 1. The clearance notch 111 can adapt to the outer peripheral shape of the screw 32, and the screw 32 can be embedded in the clearance notch 111 while the outer peripheral surface of the head 31 abuts against the inner wall of the receiving groove 13. In this way, when the screw 32 breaks, the part of the screw 32 connected to the head 31 can be positioned downward in the clearance notch 111, while the head 31 is supported on the inner wall of the receiving groove 13. In this way, for the wear-resistant plate 1, a section of the broken fastening bolt 3 can be stably positioned in the receiving groove 13 and the positioning hole 12, greatly reducing the probability of the broken fastening bolt 3 falling due to external force.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A wear-resistant structure of a mold, comprising a wear-resistant plate (1), a fastening bolt (3) and a positioning pin (4), wherein the wear-resistant plate (1) has a mounting hole (11) in the middle thereof, the fastening bolt (3) comprises a head (31) and a screw (32), the screw (32) passes through the mounting hole (11) and is fixedly connected to the mold (2), the positioning pin (4) is arranged in parallel with the fastening bolt (3), and is characterized in that: One end of the positioning pin (4) is fixedly connected to the wear-resistant sheet (1), and the mold (2) has a socket (21). The other end of the positioning pin (4) is inserted into the socket (21). The gap between the outer periphery of the screw (32) and the inner wall of the mounting hole (11) is smaller than the gap between the outer periphery of the positioning pin (4) and the inner wall of the socket (21). The wear-resistant sheet (1) is in the shape of a rectangular long plate and is arranged horizontally on the mold (2). The outer periphery of the positioning pin (4) has a flat section (41) on one side close to the lower side of the wear-resistant sheet (1). The flat section (41) is parallel to the lower side of the wear-resistant sheet (1). The middle part of the wear-resistant sheet (1) also has a positioning hole (12). One end of the positioning pin (4) is fixed in the positioning hole (12), and the other end of the positioning pin (4) extends out of the positioning hole (12). The length dimension of the positioning hole (12) is greater than the length dimension of the screw (32) extending out of the mounting hole (11); the surface of the wear-resistant plate (1) away from the mold (2) has a receiving groove (13) that is directly connected to the mounting hole (11); the radial dimension of the receiving groove (13) is greater than the radial dimension of the mounting hole (11); the mounting hole (11) is located on the bottom surface of the receiving groove (13); the head (31) is located in the receiving groove (13) and abuts against the bottom surface of the receiving groove (13); the inner wall of the mounting hole (11) is close to the side of the lower side of the wear-resistant plate (1) and has a clearance notch (111); the screw (32) can be positioned and embedded in the clearance notch (111) and at the same time make the outer peripheral surface of the head (31) abut against the inner wall of the receiving groove (13).

2. The wear-resistant structure of the mold according to claim 1, characterized in that: The radial dimension of the positioning pin (4) is greater than the radial dimension of the screw (32).

3. The wear-resistant structure of the mold according to claim 1, characterized in that: There are at least two mounting holes (11) and at least two fastening bolts (3). The fastening bolts (3) are arranged at intervals along the length direction of the wear-resistant plate (1), and the positioning pins (4) are located between adjacent fastening bolts (3).

4. The wear-resistant structure of the mold according to claim 3, characterized in that: The positioning pin (4) is arranged adjacent to the fastening bolt (3).

5. The wear-resistant structure of the mold according to claim 1, characterized in that: A strip-shaped oil groove (14) is provided on a surface of the wear-resistant sheet (1) away from the mold (2).

6. The wear-resistant structure of the mold according to claim 5, characterized in that: The oil groove (14) is arranged along the length direction of the wear-resistant plate (1) and is located below the positioning hole (12).

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