A lower cutting die

Abstract

The utility model discloses a lower cutter die, including cutter seat, the cutter seat upper end surface middle part is provided with the cutter groove along the transverse, the both sides of cutter groove bottom are provided with the mounting hole symmetry respectively, two mounting holes all are fixedly installed with cutter, and the fixed part of cutter bottom is adapted with the mounting hole, and the cutter side surface is closely combined with the side wall in the cutter groove inner chamber, and the cutter top end extends the cutter groove upper along. The utility model overcomes the deficiency of prior art, through the modularization and adjustable design of cutter, has solved the problem of traditional cutter maintenance difficult, short life, low precision, has improved production continuity and economy significantly.

Description

Technical Field

[0001] This utility model relates to the field of mold processing technology, specifically to a lower cutting die. Background Technology

[0002] In the field of mold processing for flexible or thin sheet materials such as sheet metal, film, and composite materials, the lower cutting die is a key punching component. Its performance directly affects the cutting quality of the product, production efficiency, and mold maintenance costs.

[0003] Currently, the traditional cutting die widely used in the industry typically fixes the cutting blade to the cutting blade holder through welding, integral embedding, or a non-adjustable fastening method. However, during long-term, high-intensity operation, the cutting edge, especially at corners used to form contours, is prone to wear or chipping. Because the cutting blade in traditional structures is fixed, once a local cutting edge is damaged, its position cannot be adjusted or flipped for reuse. Usually, the entire cutting blade module, or even the cutting blade holder, needs to be removed from the die and replaced. This method not only results in low utilization of expensive cutting blade materials and a short overall blade lifespan, but also involves a cumbersome replacement process, causing long production downtime and significantly increasing maintenance costs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a lower cutting die, which overcomes the shortcomings of the existing technology. It is reasonably designed and solves the problems of difficult maintenance, short life and low precision of traditional cutting dies through modular and adjustable design, which significantly improves production continuity and economy.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lower cutting die includes a cutting die holder. A cutting groove is formed in the middle of the upper surface of the cutting die holder along the horizontal direction. Mounting holes are symmetrically formed on both sides of the bottom of the cutting groove. A cutting die is fixedly installed in each of the two mounting holes. The bottom of the cutting die is provided with a fixing part that matches the mounting hole. The side of the cutting die is tightly fitted with the inner wall of the cutting groove. The top of the cutting die extends out of the upper edge of the cutting groove.

[0007] Preferably, an adjustment pad is installed between the lower end face of the fixing part and the bottom of the inner cavity of the mounting hole.

[0008] Preferably, ventilation holes are symmetrically provided on both sides of the bottom of the mounting hole cavity along the transverse direction.

[0009] Preferably, the upper end face of the cutter holder is provided with positioning steps symmetrically on both sides of the cutter groove, and the positioning steps are integrally formed with the cutter holder.

[0010] Preferably, the cutter holder has symmetrical through holes on both sides, and the cutter surface has threaded holes corresponding to the through holes. A fastening screw is provided in the through hole, and the end of the fastening screw passes through the through hole and is threadedly connected to the threaded hole.

[0011] Preferably, the through hole is a strip-shaped through hole, and the length direction of the through hole is set along the vertical direction of the cutter seat.

[0012] This invention provides a lower cutting die mold with the following advantages: When a specific cutting edge of the cutter wears or chipps due to prolonged use, maintenance personnel can remove the cutter from the mounting hole, adjust its vertical position or flip it, and then reinstall it. This operation allows the sharp cutting edges that were not involved in cutting or were only slightly worn to be moved to the working position, thus achieving bidirectional or even multidirectional reuse of a single cutter, greatly maximizing the potential of the tool material and significantly extending its effective service life. Furthermore, when all cutting edges of the cutter reach their wear limit, there is no need to replace the expensive cutter holder; only the individual cutter needs to be replaced as an independent module. This modular replacement method significantly reduces spare parts costs and inventory pressure compared to replacing the entire die or large module. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0014] Figure 1 A schematic diagram of the structure of this utility model;

[0015] Figure 2 A schematic diagram of the structure of this utility model;

[0016] Figure 3 A schematic diagram of the cross-sectional structure of this utility model;

[0017] Explanation of the labels in the diagram:

[0018] 1. Cutter holder; 2. Cutter groove; 3. Mounting hole; 4. Cutter; 5. Height adjustment pad; 6. Vent hole; 7. Positioning step; 8. Through hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1, as Figure 1-3As shown, a lower cutting die includes a cutting die holder 1. A cutting groove 2 is provided in the middle of the upper end face of the cutting die holder 1 along the transverse direction. Mounting holes 3 are symmetrically provided on both sides of the bottom of the cutting groove 2. A cutting die 4 is fixedly installed in each of the two mounting holes 3. The bottom of the cutting die 4 is provided with a fixing part that matches the mounting hole 3. The side of the cutting die 4 is tightly fitted with the inner wall of the cutting groove 2. The top of the cutting die 4 extends out of the upper edge of the cutting groove 2.

[0021] Working principle:

[0022] During operation, the cutter holder 1 is quickly and accurately positioned and installed with the lower die. As the press slide moves downward, the entire lower die moves upward. At this time, the cutting edge of the cutter 4 extending from the upper edge of the cutter groove 2 interacts with the corresponding cutting edge installed on the upper die to complete the precision punching of materials such as sheet metal or film.

[0023] Since the corners or localized edges of the cutter 4 are the areas that wear out the fastest, in this invention, when a specific edge of the cutter 4 (such as a corner) wears out or chipps due to prolonged use, maintenance personnel can remove the cutter 4 from the mounting hole 3, adjust its vertical position, or rotate it 180 degrees before reinstalling it. This operation moves the previously non-cutting or lightly worn sharp edges to the working position, thus achieving bidirectional or even multidirectional reuse of a single cutter 4, greatly maximizing the potential of the tool material and significantly extending its effective service life. Furthermore, when all edges of the cutter 4 reach their wear limit, there is no need to replace the expensive cutter holder 1; only the single cutter 4 needs to be replaced as an independent module. This modular replacement method significantly reduces spare parts costs and inventory pressure compared to replacing the entire mold or large module.

[0024] In Embodiment Two, as a further preferred embodiment of Embodiment One, an adjusting shim 5 is installed between the lower end face of the fixing part and the bottom of the inner cavity of the mounting hole 3. The adjusting shim 5 provides a variable reference surface for the installation of the cutter 4. By selecting adjusting shims of different thicknesses, or by combining shims of different thicknesses, the amount of sinking of the fixing part of the cutter 4 in the mounting hole 3 can be precisely and steplessly controlled, thereby accurately setting the final height of the cutter 4 extending out of the blade groove 2. This ensures that the relative height between the cutting edge of the cutter 4 and the upper die cutting edge is always kept within the optimal working range, effectively avoiding quality problems such as insufficient cutting, roughening, or increased local wear caused by height deviation. At the same time, in traditional molds, the cutting edge height decreases after the cutter is sharpened, rendering it unusable. However, in this invention, after the cutting edge of the cutter 4 is slightly worn, it can be disassembled and offline sharpened to restore its sharpness. The loss of cutting edge height caused by sharpening can be precisely compensated by increasing or decreasing the thickness of the height adjustment pad 5, so that a single cutter 4 can be sharpened and repaired multiple times until its structural strength no longer meets the requirements, thereby maximizing the material utilization rate of a single cutter.

[0025] In Example 3, as a further preferred embodiment of Example 1, vent holes 6 are symmetrically provided on both sides of the bottom of the mounting hole 3 along the transverse direction. When the fixing part of the cutter 4 is pressed into the mounting hole 3, a tightly fitting blind or quasi-blind hole, the air inside the hole is rapidly compressed, forming a strong air pressure, i.e., the "air cushion effect." This effect generates a force opposite to the installation direction, preventing the cutter 4 from falling completely to the bottom reference surface of the mounting hole 3. In this embodiment, the vent holes 6 provide a unique pressure relief channel for the compressed air, allowing the air to be discharged in time, thereby ensuring that the lower end face of the fixing part of the cutter 4 can achieve a tight, interference-free fit with the bottom of the mounting hole 3 (or the upper surface of the height adjustment pad 5), ensuring the accuracy and reliability of the installation position. Meanwhile, when disassembling the cutter 4, the vent hole 6 can effectively prevent the "vacuum adsorption" effect between the cutter 4 and the bottom of the mounting hole 3, which would make the cutter extremely difficult to remove and often require a strong knock. This avoids damage to the cutter blade, deformation of the fixing part, or even damage to the cutter seat. It effectively balances the internal and external air pressure, eliminates the vacuum adsorption force, and allows the cutter 4 to be easily, smoothly, and without damage.

[0026] In Example 4, as a further preferred embodiment of Example 1, positioning steps 7 are symmetrically arranged on both sides of the cutter groove 2 on the upper end face of the cutter holder 1, and the positioning steps 7 are integrally formed with the cutter holder 1. In traditional mold assembly, the positioning of the cutter holder on the mold base often relies on the experience of technicians for manual alignment and adjustment, which is a time-consuming and inaccurate process. However, the positioning steps 7 of this invention act as a built-in, physical, and mechanical positioning reference. This ensures that the trajectory formed by the cutting edges of all lower cutter molds is completely consistent with the theoretical contour of the mold design, fundamentally eliminating quality problems such as product size errors, incomplete cutting, or misalignment caused by installation deviations of individual cutter holders.

[0027] In Example 5, as a further preferred embodiment of Example 1, through holes 8 are symmetrically provided on both sides of the cutter holder 1. A threaded hole corresponding to the through hole is provided on the surface of the cutter 4. A fastening screw is installed in the through hole 8, with the end of the screw passing through the through hole 8 and threadedly connected to the threaded hole. The fastening screw tightly presses the side of the cutter 4 against the inner wall of the cutter groove 2. During the cutting process, the cutter 4 mainly bears the lateral force caused by the material resistance, and its direction is highly consistent with the direction of the tightening force of the fastening screw. This allows the force on the cutter 4 to be directly transmitted to the structurally robust cutter holder 1 body, resulting in a short and reasonable force flow path. This avoids unfavorable stress states such as cantilever or compressive stress concentration, thus achieving an extremely stable fixing effect and effectively preventing the cutter from loosening or shifting under impact. This connection method makes the disassembly of the cutter 4 very simple and standardized. Simply use a standard tool (such as an Allen wrench) to loosen the fastening screws on both sides to release the lock on the cutter 4, and then it can be removed from the mounting hole 3. This provides the most fundamental structural guarantee for a series of operations that extend the service life and enable rapid maintenance, such as blade flipping, vertical position adjustment, and complete replacement.

[0028] In Example Six, as a further preferred embodiment of Example Five, the through hole 8 is a strip-shaped through hole, with its length direction set along the vertical direction of the cutter holder. By setting the through hole 8 as a strip-shaped through hole structure, a vertical travel stroke is provided for the fastening screw. When it is necessary to adjust the extension height of the cutter 4, it is not necessary to completely disassemble the screw; simply loosening it allows the cutter 4 to move freely and continuously up and down within the length range of the strip-shaped hole. This achieves stepless fine adjustment of the cutter height, enabling the height setting to reach the optimal state. The height adjustment shim 5 achieves "step-like" coarse adjustment or large-range adjustment of the height by changing the shim thickness. The strip-shaped through hole 8 provides "continuous" fine adjustment capability on this basis. The two work together to form a functionally complementary composite adjustment system, enabling the cutter height control to achieve extremely high precision and flexibility. For example, the height can be adjusted to near the target value first using the height adjustment shim 5, and then the strip-shaped through hole can be used for final, fine, and precise positioning. When the cutter height needs to be finely adjusted online due to thermal expansion or slight wear of the mold, the strip-shaped through-hole design allows this operation to be completed directly and quickly on the mold without removing the cutter holder or even the entire mold, minimizing downtime.

[0029] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lower cutting die, characterized in that: The device includes a cutter holder (1), a cutter groove (2) is provided in the middle of the upper end face of the cutter holder (1) along the horizontal direction, and mounting holes (3) are symmetrically provided on both sides of the bottom of the cutter groove (2). A cutter (4) is fixedly installed in each of the two mounting holes (3). The bottom of the cutter (4) is provided with a fixing part that matches the mounting hole (3). The side of the cutter (4) is tightly fitted with the inner wall of the cutter groove (2). The top of the cutter (4) extends out of the upper edge of the cutter groove (2).

2. The lower cutting die according to claim 1, characterized in that: An adjustment pad (5) is installed between the lower end face of the fixing part and the bottom of the inner cavity of the mounting hole (3).

3. The lower cutting die according to claim 1, characterized in that: Ventilation holes (6) are symmetrically opened on both sides of the bottom of the mounting hole (3) along the transverse direction.

4. The lower cutting die according to claim 1, characterized in that: The upper end face of the cutter seat (1) is symmetrically provided with positioning steps (7) on both sides of the cutter groove (2), and the positioning steps (7) are integrally formed with the cutter seat (1).

5. A lower cutting die according to claim 1, characterized in that: The cutter holder (1) has through holes (8) symmetrically opened on both sides. The cutter (4) has a threaded hole corresponding to the through hole on its surface. A fastening screw is provided in the through hole (8). The end of the fastening screw passes through the through hole (8) and is threadedly connected to the threaded hole.

6. A lower cutting die according to claim 5, characterized in that: The through hole (8) is a strip-shaped through hole, and the length direction of the through hole (8) is set along the vertical direction of the cutter seat.

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