Closed-loop punching die with sawtooth blade and gradually-changed blade

Abstract

The invention discloses a closed-loop punching die with a sawtooth blade and a gradually-changed blade. The closed-loop punching die comprises a bottom plate. The stamping knife is vertically assembled on the upper surface of the bottom plate, and the stamping knife is a metal knife strip which is connected end to end and forms a closed loop shape; the stamping knife blade comprises an inner single-edge blade and an outer single-edge blade, and a V-shaped blade is arranged between the inner single-edge blade and the outer single-edge blade of the stamping knife blade; the head and the tail of the metal blade form an overlapping section, and the tops of an inner single-edge blade and an outer single-edge blade of the overlapping section are attached to each other. The overlapping section comprises an outer lamination and an inner lamination which are attached to each other, and the top of each of the outer lamination and the inner lamination is provided with a sawtooth blade and a straight blade; by means of bending deformation of the middle of the stamping knife, the outer lamination and the inner lamination have mutually staggered and parallel linear translation freedom degrees in the direction of the end of the stamping knife. By the adoption of the closed-loop stamping knife, the problem that butt joint at the end-to-end connecting position of the closed-loop stamping knife is not tight is solved, and meanwhile the hidden danger that a punched object is disconnected and connected during punching due to the fact that two knife edges are arranged at the overlapping section is reduced.

Description

Technical Field

[0001] The invention relates to the field of punching dies, in particular to a closed-loop punching die with a serrated edge and a gradient blade. Background Art

[0002] Punching die is a type of punching die, which uses a closed-loop punching knife to punch out a sheet of material with a desired outline. The punching knife is generally made by bending a strip of steel, so there must be a joint between the head and the tail of the punching knife. If the head and tail are not tightly connected, or the punching knife itself expands and contracts due to heat and cold, it will cause adhesion here during punching, that is, incomplete punching and unsmooth material removal. Therefore, the key point of manufacturing the punching knife is to ensure that it forms a closed-loop blade.

[0003] The Chinese utility model patent with the publication number "CN217474566U" discloses "a punching die with a gradient blade". It includes a base plate; a punching knife, which is vertically mounted on the upper surface of the base plate, with the punching knife blade facing upwards, and the punching knife is a metal blade strip connected end to end and forming a closed loop; the punching knife blade includes an inner single-edged blade and an outer single-edged blade, and the punching knife blade has a V-shaped blade between the inner single-edged blade and the outer single-edged blade; the inner single-edged blade, the outer single-edged blade, and the V-shaped blade have their tops overlapped on the same spatial horizontal plane, and the top of the V-shaped blade is connected to the inner single-edged blade and the outer single-edged blade at an obtuse angle; the head and tail of the metal blade strip form an overlapping section, and the tops of the inner single-edged blade and the outer single-edged blade of the overlapping section fit each other. The use of this utility model solves the problem of loose docking of the closed-loop punching knife at the connection point between the head and tail. At the same time, the blades of the overlapping section are finely combined into one, and finally form another closed-loop punching knife blade with a coherent form. At the same time, the transition and processing issues between different cutting edges are also considered.

[0004] The above patented technology solves many problems with its ingenious design. However, the overlapping section is composed of two blades, and the blades are theoretically thickened, which may easily lead to the theoretical hidden danger of the label paper being stuck after punching. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a closed-loop punching die with a serrated blade and a gradient blade, which solves the problem of loose connection between the end and end of the closed-loop punch, and also reduces the hidden danger of the punched object being connected during punching due to the two blades at the overlapping section.

[0006] In order to solve the above problems, the present invention provides a closed-loop punching die with a serrated blade and a gradient blade. In order to achieve the above objects, the technical solution adopted by the present invention to solve the technical problems is:

[0007] A closed-loop punching die with a serrated blade and a gradient blade comprises: a base plate; a punching knife, which is vertically mounted on the upper surface of the base plate, with the punching knife blade facing upward, and is a metal blade strip connected end to end and forming a closed-loop shape; the punching knife blade comprises an inner single-edged blade and an outer single-edged blade, and the punching knife blade has a V-shaped blade between the inner single-edged blade and the outer single-edged blade; the inner single-edged blade, the outer single-edged blade, and the V-shaped blade have their tops overlapped on the same spatial horizontal plane, and the top of the V-shaped blade is connected to the inner single-edged blade and the outer single-edged blade at an obtuse angle; the head and tail of the metal blade strip form an overlapping section, and the inner single-edged blade and the outer single-edged blade of the overlapping section each have their tops fitted with each other. The overlapping section includes outer laminations and inner laminations which fit each other, and the tops of the outer laminations and inner laminations are serrated edges and straight edges respectively; with the help of the bending deformation of the middle part of the punch, the outer laminations and inner laminations have the freedom of mutually staggered and parallel linear translation along the direction of the punch end; the outer ring surfaces of the outer laminations and inner laminations are integrally protruded with lugs, and the two lugs are driven by a linear power member to move toward or away from each other.

[0008] The beneficial effect of adopting the above technical solution is that the technical solution solves the problem of loose butt joint at the end of the closed-loop punching knife by overlapping the section. At the same time, the technical means of fitting two single-edged blades in the overlapping section is used to make the blades of the overlapping section merge into one, which also forms the effect of one blade, rather than the effect of two precise parallel blades. The two single-edged blades in the overlapping section form a blade shape similar to a V-shaped blade.

[0009] The V-shaped blade also serves as a transition between the two single-edged blades, reducing the processing difficulty of the entire punch. The obtuse angle shape ensures the continuity of the blades and also defines the range for different blades.

[0010] In addition, in order to avoid the hidden danger of the punched object being connected after punching due to the two blades in the overlapping section, the two blades here are changed to a combination of straight blade and serrated blade. At the same time, with the help of the staggered parallel freedom, the serrated blade has mutual shearing ability relative to the straight blade, thereby sawing off the possible connection of the punched object.

[0011] As a further improvement of the present invention, the top tip of each sawtooth of the serrated blade is located at a height higher than that of the straight blade, and the root of each sawtooth of the serrated blade is located at a height lower than that of the straight blade.

[0012] The beneficial effect of adopting the above technical solution is that it is convenient for the sawtooth blade to do work.

[0013] As a further improvement of the present invention, a limit groove is recessed on the top of the bottom plate, and the bottom surface of the limit groove is provided for movable contact with the bottom surface of the punching knife, and a section of the punching knife in the limit groove is in elastic swinging motion; when the two lugs are in the farthest or closest limit position, the side surfaces of the punching knife are in contact with the side surfaces of the limit groove; one end of the punching knife is connected to an integral circular arc segment through an integral straight line segment, and one end of the circular arc segment is in tangential contact with the side surface of the limit groove.

[0014] The beneficial effect of adopting the above technical solution is that only a part of the punch has elastic swing freedom, and the limit groove provides freedom and limit for this part. In addition, the tangent arc segment is just the center of the entire elastic swing of the punch, but it is not easy to form fatigue folds.

[0015] As a further improvement of the present invention, the linear power member is a linear reciprocating cylinder connected between the two lugs.

[0016] The beneficial effect of adopting the above technical solution is that the linear cylinder provides kinetic energy.

[0017] As a further improvement of the present invention, the cross-sectional profile of the punching knife at the V-shaped blade is an axisymmetric figure, and the cross-sectional profile of the punching knife at the overlapping section is also an axisymmetric figure.

[0018] The beneficial effect of adopting the above technical solution is that the final blade effect of the overlapping section and the V-shaped blade is similar.

[0019] As a further improvement of the present invention, the overlapping section has a through hole, a bolt is passed through the through hole, and the bolt is threadedly fixed to the bottom plate.

[0020] The beneficial effect of adopting the above technical solution is that the bolts ensure that the overlapping sections fit closely to each other, and ensure that the tops of the inner single-edged blade and the outer single-edged blade are almost fitted together.

[0021] As a further improvement of the present invention, the through hole is a waist-shaped hole, and the length direction of the waist-shaped hole itself is parallel to the length direction of the punching knife itself.

[0022] The beneficial effects of adopting the above technical solution are: the waist-shaped hole is convenient for fine-tuning the installation position, and the processing deformation of the punch itself is taken into consideration.

[0023] As a further improvement of the present invention, the bottom plate is provided with a hollow hole, the bolt is located in the hollow hole, and the inner wall of the hollow hole is provided with an internal threaded hole assembled with the bolt.

[0024] The beneficial effects of adopting the above technical solution are: the hollow hole facilitates the layout of the internal threaded hole, and the hollow hole also leaves operating space for the bolt knob.

[0025] As a further improvement of the present invention, the inner ring of the punch is in contact with the inner wall of the hollow hole, and the bolt is an external hexagonal bolt.

[0026] The beneficial effect of adopting the above technical solution is that the inner circle of the punch is contacted and squeezed by the inner wall of the hollow hole, ensuring that the head and tail of the punch are squeezed.

[0027] As a further improvement of the present invention, the intersections between the first and last ends of the punching knife and the inner single-edge blade or the outer single-edge blade are provided with rounded corners.

[0028] The beneficial effects of adopting the above technical solution are: the rounded corner eliminates the sharp top angle here, prevents this place from being slightly protruding and affecting the blanking effect, and ensures that the blades are smooth and overlap on the same horizontal plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 is a top view of an embodiment of the present invention;

[0031] Figure 2 It is a partial enlarged view of point A of one embodiment of the present invention;

[0032] Figure 3 is a perspective view of an embodiment of the present invention;

[0033] Figure 4 It is a partial enlarged view of point B of an embodiment of the present invention;

[0034] Figure 5 is a perspective view of an embodiment of the present invention;

[0035] Figure 6 It is a partial enlarged view of position C of an embodiment of the present invention;

[0036] Figure 7 It is a partial enlarged view of position D of an embodiment of the present invention;

[0037] Figure 8 is a perspective view of an embodiment of the present invention;

[0038] Fig. 9 It is a partial enlarged view of point E of an embodiment of the present invention.

[0039] 1-base plate; 2-punch; 3-hollow hole; 4-bolt; 5-waist hole; 6-inner single-edge blade; 7-outer single-edge blade; 8-V-shaped blade; 9-broken line segment; 10-overlap segment; 11-straight segment; 12-outer fillet; 13-outer lamination; 14-inner lamination; 15-straight blade; 16-serrated blade; 17-lug; 18-fixing hole; 19-limiting groove; 20-arc segment. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments:

[0041] In order to achieve the purpose of the present invention, a closed-loop punching die with a serrated blade and a gradient blade comprises: a base plate 1; a punching blade 2, which is vertically fixed on the upper surface of the base plate 1, with the blade of the punching blade 2 facing upward, and the punching blade 2 is a metal blade strip connected end to end and forming a closed-loop shape; the blade of the punching blade 2 comprises an inner single-edge blade 6 and an outer single-edge blade 7, and the blade of the punching blade 2 has a V-shaped blade 8 between the inner single-edge blade 6 and the outer single-edge blade 7; the tops of the inner single-edge blade 6, the outer single-edge blade 7, and the V-shaped blade 8 overlap on the same spatial horizontal plane, and the top of the V-shaped blade 8 is connected to the inner single-edge blade 6 and the outer single-edge blade 7 at an obtuse angle; the head and tail of the metal blade strip constitute an overlapping section 10, and the tops of the inner single-edge blade 6 and the outer single-edge blade 7 of the overlapping section 10 fit each other.

[0042] like Figure 2 , Figure 7 As shown, both ends of the folded line segment 9 are integrally connected with straight line segments 11 , the two straight line segments 11 are parallel to each other, and the straight line segments 11 intersect the folded line segment 9 at an obtuse angle.

[0043] The root of the entire punch blade 2 is half-buried in the base plate 1 .

[0044] The beneficial effect of adopting the above technical solution is: this technical solution solves the problem of loose docking of the closed-loop punching cutter at the end where it is connected through the overlapping section. At the same time, the technical means of fitting two single-edged blades in the overlapping section are used to make the blades of the overlapping section merge into one, which also forms the effect of one blade, rather than the effect of two precise parallel blades. The two single-edged blades in the overlapping section form a blade shape similar to a V-shaped blade. The V-shaped blade also plays a transitional role between the two single-edged blades, reducing the processing difficulty of the entire punching cutter. The shape connected at an obtuse angle ensures the continuity of the blade and also defines intervals for different blades.

[0045] In some other embodiments of the present invention, the cross-sectional profile of the punching blade 2 at the V-shaped blade 8 is an axisymmetric figure, and the cross-sectional profile of the punching blade 2 at the overlapping section 10 is also an axisymmetric figure.

[0046] The beneficial effect of adopting the above technical solution is that the final blade effect of the overlapping section and the V-shaped blade is similar.

[0047] In some other embodiments of the present invention, the overlapping section 10 has a through hole, and a bolt 4 is inserted into the through hole, and the bolt 4 is threadedly fixed to the bottom plate 1.

[0048] The beneficial effect of adopting the above technical solution is that the bolts ensure that the overlapping sections fit closely to each other, and ensure that the tops of the inner single-edged blade and the outer single-edged blade are almost fitted together.

[0049] In some other embodiments of the present invention, the through hole is a waist-shaped hole 5 , and the length direction of the waist-shaped hole 5 is parallel to the length direction of the punching knife 2 .

[0050] The beneficial effects of adopting the above technical solution are: the waist-shaped hole is convenient for fine-tuning the installation position, and the processing deformation of the punch itself is taken into consideration.

[0051] In some other embodiments of the present invention, the bottom plate 1 is provided with a hollow hole 3 , the bolt 4 is located in the hollow hole 3 , and the inner wall of the hollow hole 3 is provided with an internal threaded hole assembled with the bolt 4 .

[0052] The beneficial effects of adopting the above technical solution are: the hollow hole facilitates the layout of the internal threaded hole, and the hollow hole also leaves operating space for the bolt knob.

[0053] In some other embodiments of the present invention, the inner ring of the punch 2 contacts the inner wall of the hollow hole 3, and the bolt 4 is an external hexagonal bolt.

[0054] The beneficial effect of adopting the above technical solution is that the inner circle of the punch is contacted and squeezed by the inner wall of the hollow hole, ensuring that the head and tail of the punch are squeezed.

[0055] In other embodiments of the present invention, Figure 6 As shown, the intersections between the two ends of the punching blade 2 and the inner single-edge blade 6 or the outer single-edge blade 7 are provided with outer rounded corners 12.

[0056] The beneficial effects of adopting the above technical solution are: the rounded corner eliminates the sharp top angle here, prevents this place from being slightly protruding and affecting the blanking effect, and ensures that the blades are smooth and overlap on the same horizontal plane.

[0057] The overlapping section 10 includes an outer laminate 13 and an inner laminate 14 which are fitted together, and the outer laminate 13 and the inner laminate 14 have a serrated edge 16 and a straight edge 15 at the top respectively; the outer laminate 13 and the inner laminate 14 are allowed to have the freedom of mutually staggered and parallel linear translation along the end direction of the punch 2 by means of the bending deformation of the middle part of the punch 2; the outer laminate 13 and the inner laminate 14 each have a lug 17 protruding from the surface where the outer circle is located, and the two lugs 17 are driven by a linear power member to move toward or away from each other.

[0058] In some other embodiments of the present invention, the top tip of each sawtooth of the serrated blade 16 is located at a height higher than that of the straight blade 15 , and the root of each sawtooth of the serrated blade 16 is located at a height lower than that of the straight blade 15 .

[0059] In some other embodiments of the present invention, a limit groove 19 is recessed at the top of the base plate 1, and the bottom surface of the limit groove 19 is provided for movable contact with the bottom surface of the punching knife 2, and a section of the punching knife 2 in the limit groove 19 is in elastic swinging motion; when the two lugs 17 are in the farthest or closest limit position, the side surfaces of the punching knife 2 are in contact with the side surfaces of the limit groove 19; one end of the punching knife 2 is connected to an integral circular arc segment 20 through an integral straight line segment 11, and one end of the circular arc segment 20 is in tangential contact with the side surface of the limit groove 19.

[0060] In some other embodiments of the present invention, the linear power member is a linear reciprocating cylinder connected between the two lugs 17 .

[0061] In order to facilitate the presentation of the structure, Figures 5 to 7 The bottom plate 1 is hidden in FIG.

[0062] The two lugs 17 are provided with fixing holes 18 which are coaxial with each other.

[0063] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. Closed loop punching die with serrated blade and gradient blade, It is characterized in that include: Base plate; The punching knife is vertically mounted on the upper surface of the bottom plate, the blade of the punching knife faces upward, and the punching knife is a metal blade connected end to end to form a closed loop; The punch blade comprises an inner single-edge blade and an outer single-edge blade, and the punch blade has a V-shaped blade between the inner single-edge blade and the outer single-edge blade; The tops of the inner single-edged blade, the outer single-edged blade and the V-shaped blade overlap on the same horizontal plane, and the top of the V-shaped blade is connected to the inner single-edged blade and the outer single-edged blade at an obtuse angle; The head and tail of the metal blade form an overlapping section, and the tops of the inner single-edged blade and the outer single-edged blade of the overlapping section are in contact with each other; The overlapping section comprises an outer lamination and an inner lamination which are attached to each other, and the tops of the outer lamination and the inner lamination are respectively a serrated edge and a straight edge; By means of the bending deformation of the middle part of the punch, the outer laminations and the inner laminations are given the freedom of mutually staggered and parallel linear translation along the direction of the punch end; The outer ring surfaces of the outer laminations and the inner laminations are integrally protruded with lugs, and the two lugs are driven by a linear power member to move toward or away from each other.

2. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: The top tip of each sawtooth of the serrated blade is located at a height higher than that of the straight blade, and the root of each sawtooth of the serrated blade is located at a height lower than that of the straight blade.

3. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: A limiting groove is recessed on the top of the bottom plate, and the bottom surface of the limiting groove is in movable contact with the bottom surface of the punching knife, and a section of the punching knife in the limiting groove is in elastic swinging motion; when the two lugs are in the farthest or closest limiting position, the side surfaces of the punching knife are in contact with the side surfaces of the limiting groove; one end of the punching knife is connected to an integral circular arc segment through an integral straight line segment, and one end of the circular arc segment is in tangential contact with the side surface of the limiting groove.

4. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: The linear power member is a linear reciprocating cylinder connected between two lugs.

5. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: The cross-sectional profile of the punching knife at the V-shaped blade is an axisymmetric figure, and the cross-sectional profile of the punching knife at the overlapping section is also an axisymmetric figure.

6. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: The overlapping section is provided with a through hole, a bolt is passed through the through hole, and the bolt is threadedly fixed to the bottom plate.

7. The closed-loop punching die with serrated blade and gradient blade according to claim 6, Features: The through hole is a waist-shaped hole, and the length direction of the waist-shaped hole itself is parallel to the length direction of the punching knife itself.

8. The closed-loop punching die with serrated blade and gradient blade according to claim 7, Features: The bottom plate is provided with a hollow hole, the bolt is located in the hollow hole, and the inner wall of the hollow hole is provided with an internal threaded hole assembled with the bolt.

9. The closed-loop punching die with serrated blade and gradient blade according to claim 8, Features: The inner ring of the punch is in contact with the inner wall of the hollow hole, and the bolt is an external hexagonal bolt.

10. The closed-loop punching die with serrated blade and gradient blade according to claim 1, Features: The intersections of the two ends of the punching knife and the inner single-edge blade or the outer single-edge blade are provided with rounded corners.

Images