Search

CN-122007212-A - Adjustable lower die for bending machine

CN122007212ACN 122007212 ACN122007212 ACN 122007212ACN-122007212-A

Abstract

The present invention provides an adjustable lower mold for a bending machine, which relates to the field of metal sheet plastic processing and forming technology. It includes a mold shell, a module spacing adjustment mechanism, set inside the mold shell, and two sets of adjustment modules that are single blocks and slide connected to the top of the mold shell. The present invention controls the lifting of the tooth plate through an electric telescopic rod to adaptively engage the pointed tooth block with the tooth groove, providing independent rigid locking to protect the transmission screw from lateral pressure wear, and using the difference in aperture between the circular rod and the through-hole to achieve dynamic fine adjustment to completely eliminate accumulated tolerances and ensure bending accuracy. At the same time, the trapezoidal block is driven by a cylinder to lift and achieve flexible adjustment of the bottom height to adapt to different thicknesses of plates. A flexible support mechanism is introduced between the support platform and the lower mold cushion block, By utilizing the deformation of elastic components and the rotation of damping rods, the vertical downward pressure impact can be effectively absorbed and buffered, thereby significantly extending the overall life of the mold and improving the safety and stability of the system.

Inventors

  • LIU PING
  • LIU HUA
  • XU LEI

Assignees

  • 南京金球数控机床股份有限公司

Dates

Publication Date
20260512
Application Date
20260407

Claims (10)

  1. 1. An adjustable lower die for a bending machine, comprising: A mold outer case (100); A module pitch adjustment mechanism (400) provided inside the mold outer case (100); Two groups of adjusting module single blocks (300) are slidably connected to the top of the die outer shell (100) and are in transmission connection with the module spacing adjusting mechanism (400) so as to adjust the horizontal spacing between the two groups of adjusting module single blocks (300) through the driving of the module spacing adjusting mechanism (400); The base adjusting mechanism (500) is arranged in the die outer shell (100) and positioned below the two groups of adjusting module single blocks (300) and is used for adjusting the lifting height of the base adjusting mechanism, and the top of the base adjusting mechanism and the inner side walls of the two groups of adjusting module single blocks (300) form a V-shaped lower die cavity for bending together; And the module supporting mechanism (200) is arranged on the die outer shell (100) and is positioned under the adjusting module single block (300) and is used for being selectively spliced and clamped with a tooth-shaped structure at the bottom of the adjusting module single block (300), so that positioning and supporting are provided for the adjusting module single block (300) after the distance adjustment is completed.
  2. 2. The adjustable lower die for the bending machine according to claim 1, wherein the die outer shell (100) comprises an outer support shell (101) and an annular upper cover (102) fixedly connected to the top of the outer support shell (101), the adjusting module single block (300) comprises a lower die single block (301), the lower die single block (301) is slidably arranged in an inner notch at the top of the annular upper cover (102), a plurality of groups of pointed tooth blocks (303) are fixedly connected to the bottom of the lower die single block (301) at equal intervals along the length direction of the lower die single block, the bottom ends of the pointed tooth blocks (303) are in a triangular structure, and first through holes (302) are vertically formed in the lower die single block (301) and are used for establishing transmission connection with the module spacing adjusting mechanism (400).
  3. 3. The adjustable lower die for the bending machine according to claim 2, wherein the module supporting mechanism (200) comprises two groups of first long plates (201) fixedly connected to a notch at the bottom of the annular upper cover (102), a plurality of racks (202) are fixedly connected to the top of the first long plates (201) at equal intervals along the horizontal direction, tooth grooves (203) matched with the pointed tooth blocks (303) are formed between two adjacent groups of racks (202), the pointed tooth blocks (303) can be naturally inserted downwards into the inner sides of the tooth grooves (203), and self-adaptive guiding is realized in the inserting process through a triangular structure at the bottom end of the pointed tooth blocks, so that assembly tolerance generated in the process of adjusting the spacing is eliminated while locking.
  4. 4. The adjustable lower die for the bending machine of claim 3, wherein the first long plate (201) is provided with toothed plate slots (204) communicated with the upper side and the lower side of the first long plate, the module supporting mechanism (200) further comprises an electric telescopic rod (205) arranged below the first long plate (201), the output end of the electric telescopic rod (205) is fixedly connected with a connecting plate (206), the top of the connecting plate (206) is fixedly provided with a second long plate (207), and the top of the second long plate (207) is fixedly connected with a plurality of groups of toothed plates (208) corresponding to the positions of the toothed plate slots (204) one by one.
  5. 5. An adjustable lower die for a bending machine according to claim 4, wherein when two groups of the adjusting module single blocks (300) are in a space adjusting state, the electric telescopic rods (205) are contracted to drive the toothed plates (208) to pass through the toothed plate slots (204) upwards and enter the toothed grooves (203), so that the pointed tooth blocks (303) inserted into the toothed grooves (203) are jacked upwards, only the bottom ends of the pointed tooth blocks (303) remain above the toothed grooves (203) to slide, the lower die single blocks (301) are unlocked and are in a free state capable of horizontally translating, when the two groups of the adjusting module single blocks (300) are in a fixed operation state, the electric telescopic rods (205) are elongated, the toothed plates (208) are separated from the toothed grooves (203) downwards, and the pointed tooth blocks (303) are completely dropped back and inserted into the toothed grooves (203) to complete support and fixation.
  6. 6. An adjustable lower die for a bending machine according to claim 3, wherein the module spacing adjusting mechanism (400) comprises a servo motor (401) fixed on the side wall of the outer support shell (101), an output shaft of the servo motor (401) penetrates into the inner part and is connected with a first threaded rod (402), two groups of converters (403) are connected to the first threaded rod (402) in a transmission mode, and two sides of each group of converters (403) are connected with a second threaded rod (404) in a transverse arrangement in a synchronous transmission mode.
  7. 7. The adjustable lower die for the bending machine according to claim 6, wherein two pairs of symmetrical inner guide plates (104) parallel to the second threaded rods (404) are fixed on the inner bottom surface of the outer support shell (101), a plurality of groups of the second threaded rods (404) are connected with sliding blocks (405) in a threaded manner, the sliding blocks (405) are clamped on the inner sides of the inner guide plates (104) to obtain translational guiding, round rods (406) extending upwards and penetrating through the first through holes (302) are vertically and fixedly connected to the tops of the sliding blocks (405), so that when the sliding blocks (405) are driven transversely, the lower die single blocks (301) are shifted to move synchronously, the aperture of the first through holes (302) is slightly larger than the outer diameter of the round rods (406), and the triangular ends of the pointed tooth blocks (303) are matched, so that a transverse play allowance is reserved for self-adaptive fine-tuning action when the tooth grooves (203) fall into.
  8. 8. The adjustable lower die for the bending machine of claim 1, wherein the base adjusting mechanism (500) comprises a cylinder (501) horizontally arranged on the inner bottom surface of the die outer shell (100), an output shaft of the cylinder (501) is fixedly connected with a first trapezoid block (502), a second trapezoid block (504) is slidably connected above an inclined plane of the first trapezoid block (502), a supporting table (503) is horizontally and fixedly connected to the top of the second trapezoid block (504), a lower die cushion block (505) is arranged above the supporting table (503), the cylinder (501) pushes the first trapezoid block (502) to horizontally displace, and the inclined plane is utilized to squeeze the second trapezoid block (504), so that the supporting table (503) and the lower die cushion block (505) are driven to integrally perform lifting adjustment in the vertical direction.
  9. 9. The adjustable lower die for the bending machine as claimed in claim 8, wherein a lower guide plate (103) is fixedly connected to the inside of the die outer shell (100), and the inner wall of the lower guide plate (103) is matched with the outer contour of the lower die cushion block (505) so as to conduct limit guide in the vertical direction on the lifting track of the lower die cushion block (505).
  10. 10. The adjustable lower die for the bending machine of claim 8, wherein a flexible supporting mechanism (600) is arranged between the supporting table (503) and the lower die cushion block (505), the flexible supporting mechanism (600) comprises a plurality of groups of rotating bases (601) fixed at the tops of the supporting table (503), a first horizontal damping rod (602) is hinged to the rotating bases (601), the other end of the first damping rod (602) is rotatably connected with a middle block (603), an elastic piece (604) is sleeved outside the first damping rod (602), two ends of the elastic piece (604) are fixedly connected with two ends of the corresponding first damping rod (602) respectively, a second vertical damping rod (605) is connected to the bottoms of the middle block (603), a supporting block (606) is fixed at the tops of the second vertical damping rod, and the top surface of the supporting block (606) is abutted to the bottom surface of the lower die cushion block (505) so that when the lower die cushion block (505) is matched for bending operation, impact force is buffered by the damping rod and the elastic piece (604).

Description

Adjustable lower die for bending machine Technical Field The invention relates to the technical field of plastic processing and forming of metal plates, in particular to an adjustable lower die for a bending machine. Background In the field of sheet metal processing, bending machines are indispensable core plastic forming devices. In practical production line operation, in order to adapt to metal plates with different thicknesses and various bending angle requirements, operators are usually required to frequently change the opening width of the V-shaped groove of the lower die. The traditional integrally-replaced lower die not only consumes a great deal of labor and downtime, but also has great potential safety hazard in the process of carrying the large die, so that the lower die with adjustable spacing is gradually and widely adopted in the industry. The adjustable lower die mainly utilizes an internal driving transmission system to control the horizontal transverse movement of die stop blocks at two sides, so that a bending cavity with a required opening size is spliced. However, since the stamping load generated by the upper die pressing the sheet material downward at the moment of bending is extremely large, the sheet metal material in the stage of yielding deformation can generate extremely strong lateral expansion separating force and vertical downward severe impact force on the inner side wall of the lower die. The adjustable lower die is strictly required to have an automatic adjusting function, and meanwhile, absolute stable rigid support and locking shaping capability are required to be provided after width positioning is completed, so that the die is prevented from generating a milli-displacement under heavy-load stamping, and the angle consistency and the dimensional accuracy of batch processing products are ensured. The existing conventional adjustable lower die mostly utilizes a servo motor to drive a bidirectional screw rod to rotate, and drives nut sliding blocks and lower die stop blocks at two sides to synchronously move in opposite directions or back to adjust the width of a V-shaped opening. Although the prior art realizes convenient adjustment of the width of the lower die, the prior art has the fatal defect of precision loss in the actual high-frequency heavy-load processing scene. The horizontal position fixing of the lower die stop block is completely dependent on the thread engagement self-locking force between the screw rod and the nut, so that the huge lateral extrusion force which bursts to two sides when the plate is bent is resisted hard. Such a structure, in which the transmission member is directly subjected to extreme load, causes serious mechanical wear of the screw thread pair in a short time, and thus a large transmission clearance error is inevitably accumulated. Due to the lack of a bottom rigid bearing and secondary locking structure independent of the transmission system, once the lower die stop is stressed, the accumulated assembly tolerance and wear clearance can be directly converted into transverse yielding deflection of the lower die stop, so that the actually processed bending angle is deviated, and the yield of the same batch of products is suddenly reduced. Meanwhile, the design of taking the driving mechanism as the only stress point is extremely easy to cause fatigue deformation and even tooth breakage of the whole screw transmission assembly when facing to vertical rigid impact lacking buffering. Disclosure of Invention The invention aims to solve the problem that in the prior art, a screw thread pair is easy to generate serious mechanical abrasion during use, so that abrasion tolerance is caused, and provides an adjustable lower die for a bending machine. In order to achieve the purpose, the adjustable lower die for the bending machine comprises a die outer shell, a die space adjusting mechanism, two groups of adjusting die single blocks, a base adjusting mechanism and a die supporting mechanism, wherein the die space adjusting mechanism is arranged inside the die outer shell, the two groups of adjusting die single blocks are connected to the top of the die outer shell in a sliding mode and are in transmission connection with the die space adjusting mechanism so as to adjust the horizontal space between the two groups of adjusting die single blocks through driving of the die space adjusting mechanism, the base adjusting mechanism is arranged in the die outer shell and is located below the two groups of adjusting die single blocks and used for adjusting the lifting height of the base adjusting mechanism, the top of the base adjusting mechanism and the inner side walls of the two groups of adjusting die single blocks form a V-shaped lower die cavity for bending together, and the die supporting mechanism is arranged on the die outer shell and located right below the adjusting die single blocks and is used for being selectively spliced and clamped with a toot