Rotary cutting die structure

Abstract

The utility model relates to a rotary cutting die structure which comprises an upper male die, a lower female die, a female die plate, a downward pressing assembly and a height fixing assembly, the lower female die is provided with an installation hole for installing a part, the installation hole is used for fixing the part, the upper male die extends into a rotary cutting position of an inner cavity of the part, a vertically-through moving track hole is formed in the female die plate, and the lower female die is located in the moving track hole. The downward pressing assembly drives the lower female die to move downwards and horizontally move in a moving track hole, so that the axis of the part and the axis of the upper male die are staggered for rotary cutting, the part is placed in the mounting hole, the upper male die stretches into the upper end of a stretching-in groove of the part, and the height fixing assembly is used for controlling the stretching-in amount of the upper male die, namely the rotary cutting amount. The downward pressing assembly is used for driving the lower male die to move in the moving track hole of the female die plate in four directions, so that the axis of the upper male die is staggered from the axis of the lower female die and the axis of the part, and rotary cutting is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of rotary cutting equipment, and specifically relates to a rotary cutting die structure. Background Technology

[0002] The flange edges of high-precision drawn parts require high flatness and perpendicularity. However, the height difference at the opening of the part after the drawing process will affect the flange effect. Therefore, the part needs to be flattened (as shown in the attached image). Figure 1 (As shown). Traditional processes use lathes to turn the parts to create a flat surface. This method has disadvantages such as large footprint, low efficiency, high processing cost, and high risk of part deformation.

[0003] Existing rotary cutting dies, when machining thin-walled drawn parts, typically require complex internal support mechanisms (such as expansion cores or multi-lobed support structures) to prevent the parts from sinking or deforming under lateral cutting forces. While this cored rotary cutting structure provides support, it results in a highly complex and bulky die structure, increases the difficulty of demolding and material handling, and limits further improvements in production efficiency. Furthermore, for certain small-diameter or specially structured parts, the design of internal support mechanisms is extremely challenging and prone to damage.

[0004] Therefore, in order to solve the above problems, we conducted research and development on the "rotary cutting" process for the flange characteristics and dimensional requirements of this type of metal parts. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a rotary cutting die structure that can perform "flat-edge treatment" on the opening of the part so that the process characteristics of the part after flat-edge treatment meet the requirements of the subsequent flanging process.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a rotary cutting die structure, including an upper punch, a lower die, a die template, a pressing component, and a height fixing component. The lower die has a mounting hole for mounting parts, and the mounting hole is used to fix the parts. The upper punch extends into the rotary cutting position of the inner cavity of the part. The die template forms a vertically penetrating movable track hole. The lower die is located in the movable track hole. The pressing component drives the lower die to move downward and horizontally within the movable track hole so that the axis of the part intersects with the axis of the upper punch for rotary cutting.

[0007] Furthermore, the lower concave die peripheral surface has two displacement protrusions spaced vertically, and guide chamfers are formed at the outer edges of the upper and lower ends of the displacement protrusions;

[0008] The moving track hole is composed of multiple sets of four-way lateral moving track holes arranged vertically. The four-way lateral moving track holes include a left lateral moving track hole, a front lateral moving track hole, a right lateral moving track hole, and a rear lateral moving track hole arranged vertically. The left, front, right, and rear lateral moving track holes have identical structures. A cross coordinate system is constructed with the moving track hole as the center in the horizontal projection, and the moving directions of the front and rear lateral moving track holes are extended lines. The extension line of the track hole coincides with the Y-axis and faces opposite directions. Taking the movement direction of the left and right transverse track holes as the extension line, the extension lines of the left and right transverse track holes coincide with the X-axis and face opposite directions. In the vertical section, the left side of the left transverse track hole forms an inclined surface that fits with the guide chamfer at the upper end of the displacement convex ring, and the right side of the right transverse track hole forms an inclined surface that fits with the guide chamfer at the lower end of the displacement convex ring. The two displacement convex rings are located in different sets of four-way transverse tracks.

[0009] Furthermore, the rotary cutting die structure also includes an upper die base, an upper fixing plate, and a lower die base. The upper fixing plate is connected to the lower surface of the upper die base, and the upper punch, the height fixing assembly, and the lower pressing assembly are connected to the lower surface of the upper fixing plate; the concave die plate is connected to the upper surface of the lower die base.

[0010] Furthermore, the concave template includes a lower fixed plate and a protrusion. The lower fixed plate has a through hole, the protrusion is located inside the through hole, and a movable track hole is formed on the protrusion.

[0011] Furthermore, an upper pad is provided between the upper mold base and the upper fixed plate, and a lower pad is provided between the concave mold plate and the lower mold base.

[0012] Furthermore, the pressing assembly includes a pressing rod, which is fixedly mounted on the upper fixed plate and has its pressing end extending out of the lower surface of the upper fixed plate.

[0013] Furthermore, the height-fixing component includes a height-fixing rod, which is located in the middle of the upper punch and extends out of the lower surface of the upper punch.

[0014] Furthermore, the lower die base has a clearance hole, and the rotary cutting die structure also includes a demolding assembly and a push-off assembly. The demolding assembly includes a force transmission cylinder, an inner release spring seat, and an ejector pin. The force transmission cylinder is located in the clearance hole and its upper end extends into the moving track hole. The inner release spring seat is located inside the force transmission cylinder and is fixedly connected. The upper surface of the inner release spring seat has a sliding groove. The ejector pin is located in the sliding groove and its upper end extends into the mounting hole of the lower die. A return spring is provided between the ejector pin and the bottom of the sliding groove. The push-off assembly is used to apply an upward push-off force to the force transmission cylinder.

[0015] Furthermore, the abutting component includes a nitrogen spring, the output end of which abuts against the bottom surface of the force transmission cylinder.

[0016] Furthermore, the output end of the nitrogen spring is connected to a force transmission pad, which abuts against the bottom surface of the force transmission cylinder, and the horizontal projection of the force transmission pad covers the horizontal projection of the clearance hole.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The part of this invention is placed in the mounting hole, and the upper punch extends into the upper end of the extension groove of the part. The height fixing component is used to control the extension amount of the upper punch, that is, the amount of rotary cutting. The lower pressing component is used to drive the lower punch to move in four directions in the moving track hole of the die plate, so that the axis of the upper punch is misaligned with the axis of the lower die and the part, thereby realizing rotary cutting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the principle of the flat-edge treatment mentioned in the background art of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a cross-sectional view of the lower die and the protrusion in this utility model.

[0022] The markings in the diagram are: 1. Upper punch; 2. Lower die; 21. Displacement ring; 3. Die plate; 31. Lower fixed plate; 32. Thrust; 33. Moving track hole; 4. Upper mold base; 41. Upper fixed plate; 42. Upper pad; 5. Lower mold base; 51. Lower pad; 6. Lower pressure rod; 7. Height-keeping rod; 8. Force transmission cylinder; 81. Inner release spring seat; 82. Ejector column; 9. Nitrogen spring; 91. Force transmission pad. Detailed Implementation

[0023] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0024] The parts processed by this solution are cylindrical with an insertion groove formed on the upper surface.

[0025] like Figures 1-3 As shown, this embodiment provides a rotary cutting die structure, including an upper punch 1, a lower die 2, a die plate 3, an upper die base 4, an upper fixing plate 41, an upper pad plate 42, a lower pad plate 51, a lower die base 5, a pressing component, a height fixing component, a demolding component, and a pushing component.

[0026] The lower surface of the upper mold base 4 is connected from top to bottom to an upper pad plate 42 and an upper fixed plate 41. The upper punch 1, the height fixing component and the lower pressing component are connected inside the upper fixed plate 41. Specifically, the upper punch 1 is located in the middle of the upper pad plate 42 and its end extends out of the lower surface of the upper fixed plate 41. The diameter of the upper punch 1 is matched with or slightly smaller than the diameter of the insertion groove (less than 1 mm). The height fixing component includes a height fixing rod 7. The diameter of the height fixing rod 7 is less than or equal to half the diameter of the insertion groove. The height fixing rod 7 is located in the middle of the upper punch 1 and its lower end extends out of the lower surface of the upper fixed plate. The lower pressing component includes a lower pressing rod 6. The lower pressing rod 6 is fixedly mounted on the upper fixed plate 41 and its lower pressing end extends out of the lower surface of the upper fixed plate 41.

[0027] The lower mold base 5 is connected to the lower pad 51 and the concave mold plate 3 from bottom to top. The concave mold plate 3 has a through-hole 33. The lower mold 2 is located in the through-hole 33. Specifically, the concave mold plate 3 includes a lower fixing plate 31 and a boss 32. The lower fixing plate 31 has a through hole, and the boss 32 is located in the through hole. The boss 32 has a through-hole 33. The lower die 2 has mounting holes for placing parts. Specifically, the lower die 2 has two vertically spaced displacement protrusions 21 on its circumference. The two displacement protrusions 21 achieve two-point positioning. Guide chamfers are formed at the outer edges of the upper and lower ends of the displacement protrusions 21. The moving track hole 33 is composed of multiple sets of four-way transverse track holes arranged vertically. The four-way transverse track holes include a left transverse track hole, a front transverse track hole, a right transverse track hole, and a rear transverse track hole arranged vertically. The left transverse track hole, the front transverse track hole, the right transverse track hole, and the rear transverse track hole have the same structure and are positioned in the horizontal projection as the moving track holes. Using 33 as the center, draw a cross coordinate system. Extend the lines along the movement directions of the front and rear transverse track holes. These extension lines coincide with the Y-axis and face opposite directions. Extend the lines along the movement directions of the left and right transverse track holes. These extension lines coincide with the X-axis and face opposite directions. In the vertical section, a slope is formed on the left side of the left transverse track hole that fits with the guide chamfer at the upper end of the displacement convex ring 21. In the vertical section, a slope is formed on the right side of the right transverse track hole that fits with the guide chamfer at the lower end of the displacement convex ring 21. The two displacement convex rings 21 are located in different sets of four-way transverse tracks.

[0028] The lower mold base 5 has a clearance hole. The rotary cutting die structure also includes a demolding assembly and a push-off assembly. The demolding assembly includes a force transmission cylinder 8, an inner release spring seat 81, and an ejector pin 82. The force transmission cylinder 8 is located in the clearance hole and its upper end extends into the moving track hole 33. The inner release spring seat 81 is located inside the force transmission cylinder 8 and is fixedly connected. The upper surface of the inner release spring seat 81 has a sliding groove. The ejector pin 82 is located in the sliding groove and its upper end extends into the mounting hole of the lower die 2. A reset spring is provided between the ejector pin 82 and the bottom of the sliding groove. The push-off assembly is used to apply an upward push-off force to the force transmission cylinder 8. Specifically, the push-off assembly includes a nitrogen spring 9. The output end of the nitrogen spring 9 pushes against the bottom surface of the force transmission cylinder 8. The output end of the nitrogen spring 9 is connected to a force transmission pad 91. The force transmission pad 91 pushes against the bottom surface of the force transmission cylinder 8. The horizontal projection of the force transmission pad 91 covers the horizontal projection of the clearance hole.

[0029] Working principle: The part is placed in the mounting hole, and the bottom of the part is supported by the ejector pin 82. When spin cutting is to be performed, the upper die holder 4 drives the upper punch 1, the height-fixing rod 7 and the lower pressure rod 6 to move downward. The height-fixing rod 7 extends into the bottom of the part insertion groove, and the upper punch 1 extends into the upper end of the insertion groove. The distance that the upper punch 1 extends into the insertion groove is the height of the upper end of the part that needs to be spin-cut. The lower pressure rod 6 abuts against the surface of the lower die 2, and then the upper die holder 4 continues to move downward. Under the action of the lower pressure rod 6, the displacement ring 21 of the lower die 2 moves along the four-way transverse track hole in the moving track hole 33. The left transverse track hole, the front transverse track hole, the right transverse track hole and the rear transverse track hole are arranged vertically. The lower die 2 realizes left, forward, right and backward movement, realizing four-way movement. During the movement, the axis of the part and the axis of the upper punch 1 are misaligned, realizing spin cutting. During the downward pressing of the lowering rod 6, the force transmission cylinder 8 and the force transmission pad 91 will move along with the downward pressing of the lowering rod 6, and the nitrogen spring 9 will always generate an upward resisting force on the force transmission pad 91 to ensure the effectiveness of the rotary cutting process.

[0030] Preferably, this solution achieves rotary cutting by intersecting the axes of the upper punch 1 and the lower die 2 during their downward movement. Therefore, the materials of the upper punch 1 and the lower die 2 must have high strength. The upper punch 1 and the lower die 2 can be made of steel with the following materials, such as SKD11, SKH-9, DC53, SKH-51, DC337, or MT312RM, with SKH-9 being the most preferred material.

[0031] Furthermore, it was found during the rotary cutting process that the surface coating treatment of the upper punch 1 and the lower die 2 would affect the rotary cutting effect. Therefore, the surface coating treatment parameters of the upper punch 1 and the lower die 2 in this scheme are as follows: using the "physical vapor deposition (PVD)" method, the coating "titanium carbonitride (TiCN) - gray-black" is applied, with a single-sided coating thickness of 0.002-0.003mm; the roughness after coating is ≤Ra0.2; the coating shall not have defects such as pits, scratches, peeling, blistering, or wrinkling.

[0032] In another embodiment, depending on the wall thickness and diameter of the part, the four-way transverse track hole can also be set as a three-way transverse track hole or a two-way transverse track hole, with the same principle as the four-way transverse track hole described above.

[0033] The foregoing has shown and described the basic principles and main features of this invention, as well as its advantages. Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this invention. Various changes and modifications can be made to this invention without departing from its spirit and scope. All such changes and modifications fall within the scope of this invention as defined by the appended claims and their equivalents.

Claims

1. A rotary cutting die structure, characterized in that: The device includes an upper punch, a lower die, a die template, a pressing assembly, and a height-fixing assembly. The lower die has a mounting hole for mounting parts, which is used to fix the parts. The upper punch extends into the cutting position inside the part's cavity. The die template forms a vertically penetrating movable track hole. The lower die is located in the movable track hole. The pressing assembly drives the lower die to move downward and horizontally within the movable track hole, causing the part's axis to intersect with the upper punch's axis for cutting.

2. The rotary cutting die structure according to claim 1, characterized in that: The lower concave die peripheral surface has two displacement protrusions spaced vertically, and guide chamfers are formed at the outer edges of the upper and lower ends of the displacement protrusions; The moving track hole is composed of multiple sets of four-way lateral moving track holes arranged vertically. The four-way lateral moving track holes include a left lateral moving track hole, a front lateral moving track hole, a right lateral moving track hole, and a rear lateral moving track hole arranged vertically. The left, front, right, and rear lateral moving track holes have identical structures. A cross coordinate system is constructed with the moving track hole as the center in the horizontal projection, and the moving directions of the front and rear lateral moving track holes are extended lines. The extension line of the track hole coincides with the Y-axis and faces opposite directions. Taking the movement direction of the left and right transverse track holes as the extension line, the extension lines of the left and right transverse track holes coincide with the X-axis and face opposite directions. In the vertical section, the left side of the left transverse track hole forms an inclined surface that fits with the guide chamfer at the upper end of the displacement convex ring, and the right side of the right transverse track hole forms an inclined surface that fits with the guide chamfer at the lower end of the displacement convex ring. The two displacement convex rings are located in different sets of four-way transverse tracks.

3. The rotary cutting die structure according to claim 1, characterized in that: The rotary cutting die structure also includes an upper die base, an upper fixed plate, and a lower die base. The upper fixed plate is connected to the lower surface of the upper die base, and the upper punch, the height fixing assembly, and the lower pressing assembly are connected to the lower surface of the upper fixed plate. The concave die plate is connected to the upper surface of the lower die base.

4. The rotary cutting die structure according to claim 3, characterized in that: The concave template includes a lower fixed plate and a protrusion. The lower fixed plate has a through hole, the protrusion is located in the through hole, and a movable track hole is formed on the protrusion.

5. The rotary cutting die structure according to claim 3, characterized in that: An upper pad is provided between the upper mold base and the upper fixed plate, and a lower pad is provided between the concave mold plate and the lower mold base.

6. The rotary cutting die structure according to claim 3, characterized in that: The pressing assembly includes a pressing rod, which is fixedly mounted on the upper fixed plate and has its pressing end extending out of the lower surface of the upper fixed plate.

7. The rotary cutting die structure according to claim 3, characterized in that: The height-fixing component includes a height-fixing rod, which is located in the middle of the upper punch and extends out of the lower surface of the upper punch.

8. The rotary cutting die structure according to claim 3, characterized in that: The lower die base has a clearance hole. The rotary cutting die structure also includes a demolding assembly and a push-off assembly. The demolding assembly includes a force transmission cylinder, an inner release spring seat, and an ejector pin. The force transmission cylinder is located in the clearance hole and its upper end extends into the moving track hole. The inner release spring seat is located inside the force transmission cylinder and is fixedly connected. The upper surface of the inner release spring seat has a sliding groove. The ejector pin is located in the sliding groove and its upper end extends into the mounting hole of the lower die. A return spring is provided between the ejector pin and the bottom of the sliding groove. The push-off assembly is used to apply an upward push-off force to the force transmission cylinder.

9. The rotary cutting die structure according to claim 8, characterized in that: The abutting component includes a nitrogen spring, the output end of which abuts against the bottom surface of the force transmission cylinder.

10. A rotary cutting die structure according to claim 9, characterized in that: The output end of the nitrogen spring is connected to a force transmission pad, which abuts against the bottom surface of the force transmission cylinder. The horizontal projection of the force transmission pad covers the horizontal projection of the clearance hole.

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