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CN-122016509-A - Bending test device for metal material

CN122016509ACN 122016509 ACN122016509 ACN 122016509ACN-122016509-A

Abstract

The invention discloses a metal material bending test device, relates to the technical field of metal material bending, and aims to solve the technical problem that a metal piece to be tested of the existing metal material bending test device is easy to deviate on a supporting point to influence a test result, and comprises a supporting frame; according to the invention, the two symmetrically arranged limiting frames are driven to be close to each other, the metal piece to be detected is corrected and limited, the metal piece to be detected is reduced to slide greatly in the horizontal direction, after correction, the two limiting frames distributed in a V shape are controlled to be opened and closed by matching with the springs and the adjusting piece, a certain elastic allowance is formed in the opening and closing direction, the obstruction of the transverse deformation of the sample under pressure is reduced, the rolling balls on the inner side wall of the limiting frames are matched, the sliding friction force between the clamp and the side face of the sample is converted into rolling friction force, and further, the two limiting frames are distributed in the V shape, the two ends of the sample can be rapidly separated from the limiting frames after being lifted, the two ends of the sample are prevented from being lifted naturally in the bending process, and the test precision is improved.

Inventors

  • Zhang Haohang

Assignees

  • 郑州大学

Dates

Publication Date
20260512
Application Date
20260304

Claims (8)

  1. 1. The metal material bending test device is characterized by comprising a support frame (1); The three-point bending test piece (2) is arranged on the inner side wall of the support frame (1) and comprises two groups of support pieces (202) which are symmetrically arranged and a pressing component (201) which is positioned right above the middle point between the two groups of support pieces (202); The limiting pieces (3) are arranged at two ends of the three-point bending test piece (2) symmetrically, each group comprises two symmetrically arranged clamping frames (301), limiting frames (302) are hinged to opposite surfaces of the clamping frames (301), the two limiting frames (302) are distributed in a V shape and are symmetrically arranged, and the two limiting frames (302) can be driven by the self-locking driving piece (5) through the bidirectional wire rod piece (4) to be mutually close to or far from each other; The spring (303) is detachably connected between the clamping frame (301) and the limiting frame (302) and is positioned above the hinge joint; the adjusting piece (304) penetrates through the outer side wall of the clamping frame (301) and can be matched with the spring (303) to adjust the opening and closing angles of the two limiting frames (302) which are distributed in a V shape.
  2. 2. The metal material bending test device according to claim 1, wherein the supporting member (202) comprises a first frame body (2021), a first round hole (2022) is formed in the outer side wall of the first frame body (2021), a bearing (2023) is mounted on the inner side wall of the first round hole (2022), and a supporting roller (2024) is rotatably connected through the bearing (2023).
  3. 3. The metal material bending test device according to claim 2, wherein the clamping frame (301) comprises a second frame body (3011), a second round hole (3012) capable of being matched with the adjusting piece (304) is formed in the outer side wall of the second frame body (3011), a scale ring (3013) is mounted on the outer side wall of the second frame body (3011), and the scale ring (3013) is arranged around the second round hole (3012).
  4. 4. A metal material bending test device according to claim 3, wherein the limiting frame (302) comprises a frame body (3021), a plurality of balls (3022) are rotationally connected to the outer side wall of the frame body (3021) along the side line of the frame body at equal intervals, and a third frame body (3023) is mounted on the inner side wall of the frame body (3021).
  5. 5. The metal material bending test device according to claim 4, wherein the adjusting piece (304) comprises a screw rod (3041) capable of penetrating through the second round hole (3012) and the third frame body (3023), a limiting piece (3042) is fixed at one end of the screw rod (3041), a nut (3043) is connected to the other end of the screw rod (3041) in a threaded mode, and an indication tip strip (3044) capable of being matched with the scale ring (3013) is arranged on the outer side wall of the nut (3043).
  6. 6. The bending test apparatus for a metal material according to claim 5, wherein the outer side wall of the nut (3043) is provided with a knob.
  7. 7. The metal material bending test device according to claim 6, wherein the bidirectional screw rod piece (4) comprises a limiting shell (401), a bidirectional threaded screw rod (402) is rotatably connected to the inner side wall of the limiting shell (401), left-handed threads and right-handed threads are respectively formed at two ends of the bidirectional threaded screw rod (402), and a screw rod sleeve (403) is respectively connected to the left-handed thread end and the right-handed thread end in a threaded manner.
  8. 8. The bending test device for the metal material according to claim 7, wherein the self-locking driving piece (5) comprises a worm wheel (501) fixed at the end part of the bidirectional threaded screw rod (402), a worm (502) is connected to the outer side wall of the worm wheel (501) in a meshed mode, the worm (502) is rotatably connected to the outer side wall of the support frame (1), and a hand wheel (503) is arranged at the top of the worm (502).

Description

Bending test device for metal material Technical Field The invention relates to the technical field of metal material bending, in particular to a metal material bending test device. Background Before engineering application, metal material products such as metal plates, bars and sectional materials are required to evaluate bending plastic deformation capacity and mechanical properties by a bending test, and the current common three-point bending test machine is used for testing, wherein the principle is that two ends of a sample are freely placed on two parallel supporting rollers to form a fixed span, then concentrated load is downwards applied right above the midpoints of two fulcrums of the sample by a pressure head, the sample is gradually bent between the two fulcrums along with the increase of the load, when the tensile stress born by the bottom surface of the middle part reaches a material limit, the sample is usually broken near the midpoint of the span or reaches a specified bending angle, and in order to reduce the fact that the supporting points generate larger additional axial stress or bending moment due to friction constraint, the supporting points are generally set to be rotatable smooth cylindrical rollers, and the structure is simple and the operation is convenient. The existing metal material bending test device such as a three-point bending test method has the following defects that 1, as a supporting surface is a smooth cylindrical roller generally, when a sample is placed with slight deviation, the sample is easy to slide along the horizontal direction, the actual action path of loading force can be greatly changed due to overlarge displacement, test errors are greatly increased, 2, even if lateral clamps are applied to two ends of the sample for correction and limiting, additional transverse constraint can be formed due to sliding friction force between the clamps and the side surface of the sample, the natural extension and contraction of the sample in the bending process are directly hindered, the measured load, displacement and mechanical property parameters calculated according to the displacement are distorted, and the detection precision is also severely reduced. Disclosure of Invention The invention aims to provide a metal material bending test device which aims to solve the defects in the prior art. In order to achieve the above purpose, the invention provides the following technical scheme that the invention comprises a supporting frame; The three-point bending test piece is arranged on the inner side wall of the support frame and comprises two groups of support pieces which are symmetrically arranged and a pressing component which is positioned right above the middle point between the two groups of support pieces; the limiting parts are provided with two groups of clamping frames which are symmetrically arranged at two ends of the three-point bending test part, each group of clamping frames comprises two clamping frames which are symmetrically arranged, the opposite surfaces of the clamping frames are hinged with limiting frames, the two limiting frames are distributed in a V shape and are symmetrically arranged, and the two limiting frames can be driven by the self-locking driving part through the bidirectional wire rod piece and are mutually close to/far away from each other; the spring is detachably connected between the clamping frame and the limiting frame and is positioned above the hinge joint; the adjusting piece penetrates through the outer side wall of the clamping frame and can be matched with the spring to adjust the opening and closing angles of the two limiting frames which are distributed in a V shape. As further description of the technical scheme, the support piece comprises a first frame body, a first round hole is formed in the outer side wall of the first frame body, a bearing is mounted on the inner side wall of the first round hole, and a support roller is connected with the inner side wall of the first round hole in a rotating mode through the bearing. As further description of the technical scheme, the clamping frame comprises a second frame body, a second round hole matched with the adjusting piece is formed in the outer side wall of the second frame body, a scale ring is mounted on the outer side wall of the second frame body, and the scale ring is arranged around the second round hole. As further description of the technical scheme, the limit frame comprises a frame body, a plurality of balls are rotationally connected to the outer side wall of the frame body along the side line of the frame body at equal intervals, and a third frame body is arranged on the inner side wall of the frame body. As further description of the technical scheme, the adjusting piece comprises a screw rod which can penetrate through the second round hole and the third frame body, one end of the screw rod is fixedly provided with a limiting piece, the other end of the screw r