Anti-abrasion bending die

Abstract

An anti-abrasion bending die comprises a lower die base, an upper die and two lower die assemblies, the upper die is arranged over the center of the lower die base, and the two lower die assemblies are the same in structure and are installed on the lower die base in a bilateral symmetry mode with respect to the upper die; the lower die assembly on the left side comprises an insert, a lower die and an accompanying base plate, the insert is installed on the left side portion of the lower die base, a first arc-shaped groove is formed in the right side portion of the upper surface of the insert, the lower die is embedded in the first arc-shaped groove in a matched mode, a plurality of second arc-shaped grooves are formed in the upper surface of the lower die, and round bars are embedded in the second arc-shaped grooves; a first reset spring is connected between the upper portion of the left side of the lower die and the upper surface of the insert, and a second reset spring is connected between the left side of the accompanying cushion plate and the left side of the upper surface of the lower die. According to the utility model, the rolling function of the round bar is not influenced, the clamping is avoided, the anti-abrasion effect is better achieved, and the outer side of a workpiece is not impressed and scratched.

Description

Technical Field

[0001] The utility model relates to the technical field of bending dies, in particular to a wear-resistant bending die. Background Art

[0002] When a traditional bending machine bends a plate, the workpiece and the edge of the lower die will move relative to each other, resulting in sliding friction, and indentations and scratches will appear on the contact part of the workpiece.

[0003] In order to solve the problem of sheet wear during bending, Chinese utility model patent CN2018218322094 discloses a scratch-free mold for bending, which includes an upper mold and a lower mold, and the lower mold is provided with a V-shaped groove, which is characterized in that: the cross-section of the lower mold is rectangular, and each surface of the lower mold is provided with traditional V-shaped grooves of different sizes and anti-scratch V-shaped grooves of different sizes, the anti-scratch V-shaped groove is provided with a circular groove, and an optical axis is installed in the circular groove, and a pressure block is provided on the optical axis, and the pressure block is connected to the lower mold by a tightening screw, and the pressure block is used to limit the optical axis in the circular groove. After adopting such a structure, the sheet contacts the optical axis at the groove, so that when the sheet is bent, the original sliding friction is replaced by rolling friction through the rolling of the optical axis, thereby avoiding wear of the sheet when the sheet is bent, and the use of the optical axis can further reduce wear. However, the above patent still has shortcomings in practical application: when the workpiece is bent, the optical axis is subjected to a large force, and as the bending deformation of the workpiece changes, the magnitude and direction of the force on the optical axis are constantly changing, the rolling function of the optical axis will be affected, and it may even get stuck, and it will not play a role in anti-wear.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the Invention

[0005] The purpose of the present invention is to address the deficiencies of the existing technology and thus provide a wear-resistant bending die. The present invention can ensure that the rolling function of the round rod is not affected, avoid jamming, better play an anti-wear role, and ensure that no indentations or scratches occur on the outside of the workpiece.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an anti-wear bending die, comprising a lower die base, an upper die and two lower die assemblies, wherein the upper die is placed directly above the center of the lower die base, and the two lower die assemblies have the same structure and are installed on the lower die base symmetrically with respect to the upper die;

[0007] The lower die assembly on the left includes an insert, a lower die and an accompanying pad. The insert is installed on the left side of the lower die base. The lower die is a semi-cylindrical structure. A first arc-shaped groove is provided on the right side of the upper surface of the insert along the front-to-back direction. The arc diameter of the first arc-shaped groove is the same as the outer diameter of the outer circumference of the lower die. The lower die is matched and embedded in the first arc-shaped groove and rotates in the first arc-shaped groove. The upper part of the lower die protrudes the first arc-shaped groove. The upper surface of the lower die is provided with several second arc-shaped grooves spaced apart left and right along the front-to-back direction. A rolling round rod is embedded in the second arc-shaped groove. The upper part of the round rod protrudes the second arc-shaped groove. The accompanying pad is flat on each round rod and in rolling contact with each round rod. A first reset spring is connected between the upper left part of the lower die and the upper surface of the insert, and a second reset spring is connected between the left side of the accompanying pad and the left side of the upper surface of the lower die.

[0008] Based on the above, the lower mold assembly on the left also includes several adjustment pads. A rectangular groove with an open top is provided on the lower mold base. The insert is arranged on the left side of the bottom of the rectangular groove. The adjustment pads are arranged left and right and tightly pressed between the insert and the left inner wall of the rectangular groove. The left side plate of the lower mold base and the insert are fixed together by fastening screws passing through each adjustment pad.

[0009] Based on the above, the upper surface of the insert is provided with an accommodating groove on the left side of the first arc-shaped groove, and the upper left part of the lower mold is integrally formed with a reset plate horizontally placed on the upper left part of the insert, the upper surface of the reset plate is flush with the upper surface of the lower mold, and the lower surface of the reset plate is flush with the upper surface of the insert. The left edge of the upper surface of the reset plate is also integrally formed with a protrusion located on the left side of the accompanying pad, and the upper side of the protrusion is lower than the upper surface of the accompanying pad. The first reset spring is vertically placed in the accommodating groove and its two ends are respectively connected to the bottom surface of the accommodating groove and the bottom surface of the reset plate. The second reset spring is horizontally placed between the protrusion and the accompanying pad and its two ends are respectively connected to the right side of the protrusion and the left side of the accompanying pad.

[0010] Based on the above, the right edge of the first arc-shaped groove is lower than its left edge, and the upper right corner of the lower mold is provided with a bevel surface with a higher left and a lower right side on the right side of the first arc-shaped groove. The bevel surface is arranged along the radial direction of the first arc-shaped groove, and the left side of the bevel surface extends to the right edge of the first arc-shaped groove, and the right side of the bevel surface extends to the right side surface of the lower mold.

[0011] The present invention has substantial features and progress compared with the prior art. Specifically, the beneficial effects of the present invention are as follows: when the workpiece is placed on the accompanying pad for bending, the upper die presses down directly on the workpiece. As the workpiece bends and deforms, the lower die rotates in the first arc-shaped groove to adapt to the deformation of the workpiece, and the accompanying pad rotates with the lower die. The direction of the force exerted on each round rod by the accompanying pad is relatively fixed, that is, perpendicular to the accompanying pad and parallel to the accompanying pad. At the same time, the workpiece and the accompanying pad will not slide relative to each other due to the action of friction. The accompanying pad will roll with the workpiece and each round rod relative to the lower die, ensuring that the rolling function of the round rod is not affected, avoiding jamming, and better playing an anti-wear role, ensuring that no indentation or scratch occurs on the outside of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the wear-resistant bending die of the utility model before bending a workpiece.

[0013] Figure 2 It is a schematic structural diagram of the workpiece after being bent by the wear-resistant bending die of the utility model.

[0014] In the figure: 1. Lower die base; 2. Upper die; 3. Insert; 4. Adjustment pad; 5. Fastening screw; 6. Lower die; 7. Round rod; 8. First return spring; 9. Second return spring; 10. Accompanying pad; 11. Workpiece; 12. Return plate; 13. Protrusion; 14. Beveled surface; 15. Receiving groove. DETAILED DESCRIPTION

[0015] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0016] like Figure 1 and Figure 2 As shown, a wear-resistant bending die comprises a lower die base 1, an upper die 2 and two lower die assemblies. The upper die 2 is placed directly above the center of the lower die base 1. The two lower die assemblies have the same structure and are installed on the lower die base 1 symmetrically with respect to the upper die 2.

[0017] The lower die assembly on the left includes an insert 3, a lower die 6 and an accompanying pad 10. The insert 3 is installed on the left side of the lower die base 1. The lower die 6 is a semi-cylindrical structure. A first arc-shaped groove is provided on the right side of the upper surface of the insert 3 along the front-to-back direction. The arc diameter of the first arc-shaped groove is the same as the outer diameter of the outer circumference of the lower die 6. The lower die 6 is matched and embedded in the first arc-shaped groove and rotates in the first arc-shaped groove. The upper part of the lower die 6 protrudes from the first arc-shaped groove. The upper surface of the lower die 6 is provided with several second arc-shaped grooves spaced apart left and right along the front-to-back direction. A rolling round rod 7 is embedded in the second arc-shaped groove. The upper part of the round rod 7 protrudes from the second arc-shaped groove. The accompanying pad 10 is flat on each round rod 7 and in rolling contact with each round rod 7. A first reset spring 8 is connected between the upper left part of the lower die 6 and the upper surface of the insert 3, and a second reset spring 9 is connected between the left side of the accompanying pad 10 and the left side of the upper surface of the lower die 6.

[0018] In this embodiment, the left lower die assembly further includes several adjustment pads 4. A rectangular groove with an open top is defined on the lower die base 1. The insert 3 is disposed on the left side of the inner bottom of the rectangular groove. The adjustment pads 4 are arranged horizontally and tightly pressed between the insert 3 and the left inner wall of the rectangular groove. The left side plate of the lower die base 1 and the insert 3 are fixedly connected together by fastening screws 5 that pass through each of the adjustment pads 4. A threaded blind hole is defined in the middle of the left side surface of the insert 3. Through holes corresponding to the left and right sides of the threaded blind hole are defined in the middle of the adjustment pad 4 and the middle of the left side plate of the lower die base 1. The fastening screws 5 are installed in the through holes on the left side plate of the lower die base 1. The threaded shanks of the fastening screws 5 pass through the through holes on each of the adjustment pads 4 and are threadedly connected to the threaded blind holes in the insert 3.

[0019] In this embodiment, a receiving groove 15 is provided on the upper surface of the insert 3 on the left side of the first arc-shaped groove, and a reset plate 12 is integrally formed on the upper left side of the lower mold 6 and horizontally placed on the upper left side of the insert 3. The upper surface of the reset plate 12 is flush with the upper surface of the lower mold 6, and the lower surface of the reset plate 12 is flush with the upper surface of the insert 3. The left edge of the upper surface of the reset plate 12 is also integrally formed with a protrusion 13 located on the left side of the accompanying pad 10, and the upper side of the protrusion 13 is lower than the upper surface of the accompanying pad 10. The first reset spring 8 is vertically placed in the receiving groove 15 and its two ends are respectively connected to the bottom surface of the receiving groove 15 and the bottom surface of the reset plate 12. The second reset spring 9 is horizontally placed between the protrusion 13 and the accompanying pad 10 and its two ends are respectively connected to the right side of the protrusion 13 and the left side of the accompanying pad 10.

[0020] In this embodiment, the right edge of the first arc-shaped groove is lower than its left edge, and the upper right corner of the lower mold 6 is provided with a beveled surface 14 with a higher left side and a lower right side on the right side of the first arc-shaped groove. The beveled surface 14 is arranged along the radial direction of the first arc-shaped groove, and the left side of the beveled surface 14 extends to the right edge of the first arc-shaped groove, and the right side of the beveled surface 14 extends to the right side surface of the lower mold 6.

[0021] The working principle of this embodiment is as follows: when in use, according to the bending size of the workpiece 11, the number of the adjusting pads 4 is changed, and then the spacing between the two inserts 3 is adjusted, the workpiece 11 is placed on the two accompanying pads 10, and the upper die 2 presses the workpiece 11 downward to bend it. The workpiece 11 is bent and deformed and acts on the two accompanying pads 10, while forcing the two lower dies 6 to rotate toward the center bottom of the lower die base 1 in the corresponding first arc-shaped groove, so that the two lower dies 6 adapt to the deformation of the workpiece 11, and the accompanying pads 10 rotate with the lower die 6, so that each round rod 7 is affected by the accompanying pads 10. The direction of the force of the pad 10 is relatively fixed, and the workpiece 11 and the accompanying pad 10 will not slide relative to each other due to the friction force. The accompanying pad 10 will roll relative to the lower mold 6 along with the workpiece 11 and each round rod 7 until the upper mold 2 is pressed down to the limit position set by the upper mold 2. At this time, the first return spring 8 and the second return spring 9 are both in a stretched state. Then, the upper mold 2 returns to the starting position upward and takes out the workpiece 11. The lower mold 6 is reset under the action of the first return spring 8, and the accompanying pad 10 is reset under the action of the second return spring 9.

[0022] It should be noted that the chamfered surfaces 14 are used to limit the maximum bending range of the workpiece. That is, the maximum bending angle of the workpiece is the angle formed by the two chamfered surfaces 14. When the workpiece reaches the maximum bending angle, the lower die 6 rotates until its upper surface is flush with the chamfered surfaces 14, and the accompanying pad 10 moves above the chamfered surfaces 14 and parallel to them.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A wear-resistant bending die, characterized by: It includes a lower die base, an upper die and two lower die assemblies. The upper die is placed directly above the center of the lower die base. The two lower die assemblies have the same structure and are installed on the lower die base symmetrically with respect to the upper die. The lower die assembly on the left includes an insert, a lower die and an accompanying pad. The insert is installed on the left side of the lower die base. The lower die is a semi-cylindrical structure. A first arc-shaped groove is provided on the right side of the upper surface of the insert along the front-to-back direction. The arc diameter of the first arc-shaped groove is the same as the outer diameter of the outer circumference of the lower die. The lower die is matched and embedded in the first arc-shaped groove and rotates in the first arc-shaped groove. The upper part of the lower die protrudes the first arc-shaped groove. The upper surface of the lower die is provided with several second arc-shaped grooves spaced apart left and right along the front-to-back direction. A rolling round rod is embedded in the second arc-shaped groove. The upper part of the round rod protrudes the second arc-shaped groove. The accompanying pad is flat on each round rod and in rolling contact with each round rod. A first reset spring is connected between the upper left part of the lower die and the upper surface of the insert, and a second reset spring is connected between the left side of the accompanying pad and the left side of the upper surface of the lower die.

2. The wear-resistant bending die according to claim 1, characterized in that: The lower die assembly on the left also includes several adjusting pads. A rectangular groove with an open top is provided on the lower die base. The insert is arranged on the left side of the bottom of the rectangular groove. The adjusting pads are arranged left and right and tightly pressed between the insert and the left inner wall of the rectangular groove. The left side plate of the lower die base and the insert are fixed together by fastening screws passing through each adjusting pad.

3. The wear-resistant bending die according to claim 1, characterized in that: The upper surface of the insert is provided with an accommodating groove on the left side of the first arc-shaped groove, and the upper left part of the lower mold is integrally formed with a reset plate horizontally placed on the upper left part of the insert, the upper surface of the reset plate is flush with the upper surface of the lower mold, and the lower surface of the reset plate is flush with the upper surface of the insert. The left edge of the upper surface of the reset plate is also integrally formed with a protrusion located on the left side of the accompanying pad, and the upper side of the protrusion is lower than the upper surface of the accompanying pad. The first reset spring is vertically placed in the accommodating groove and its two ends are respectively connected to the bottom surface of the accommodating groove and the bottom surface of the reset plate. The second reset spring is horizontally placed between the protrusion and the accompanying pad and its two ends are respectively connected to the right side of the protrusion and the left side of the accompanying pad.

4. The wear-resistant bending die according to claim 1, characterized in that: The right edge of the first arc-shaped groove is lower than its left edge. The upper right corner of the lower mold is provided with a beveled surface that is higher on the left and lower on the right side of the first arc-shaped groove. The beveled surface is arranged along the radial direction of the first arc-shaped groove. The left side of the beveled surface extends to the right edge of the first arc-shaped groove, and the right side of the beveled surface extends to the right side surface of the lower mold.

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