Hydraulic die for one-time forming of medium-thickness steel plate U-shaped ring

Abstract

The utility model relates to the technical field of steel structure bridges, in particular to a hydraulic die for one-step forming of a medium-thickness steel plate U-shaped ring, which comprises an upper die, a base and a movable force arm, and the bottom corner part of the upper die is a round corner, protrudes in an acute angle and is matched with a cavity of the base for extrusion forming; the two pairs of movable force arms are installed on the base through rotating shafts and used for inwards extruding the steel plate workpiece and limiting the movable force arms. Angle interference processing can be carried out on a steel plate in the bending later process, the right-angle interference of the steel plate is an acute angle, the steel plate can automatically rebound to be a right angle during drawing, demolding is convenient, demolding difficulty caused by mold expansion after U-shaped ring production is completed is effectively avoided, and mold damage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structure bridges, in particular to a hydraulic die for one-step forming of a U-shaped ring of a medium-thick steel plate. Background Art

[0002] With the development of steel structure bridges in China, the processing technology of steel structure bridges is becoming more and more mature. At present, the existing U-shaped ring processing technology for medium and thick steel plates mostly adopts a straight-up and straight-down integrated mold, which relies on a press for stamping. However, this type of mold does not handle the rebound deformation of the steel plate. During the demolding process, the steel plate will cause the U-shaped structure that should be a right-angle structure to become an obtuse angle structure that does not meet the requirements due to its own rebound deformation, which affects the subsequent installation. At the same time, it is difficult to demold due to the expansion of the mold. Utility Model Content

[0003] In order to solve the above technical problems, the utility model discloses a hydraulic die for one-step forming of a U-shaped ring of a medium-thick steel plate.

[0004] The specific technical solutions are as follows:

[0005] A hydraulic mold for one-time forming of U-shaped rings of medium and thick steel plates, used for U-shaped processing of steel plate workpieces, comprises an upper mold, a base and a movable lever; the bottom corner of the upper mold is rounded and protrudes at an acute angle, and a lever arm loading baffle is horizontally welded on the front and rear sides respectively; the interior of the base is a cavity matching the shape of the bottom of the upper mold, and two long through holes are provided in parallel on both sides of the cavity; there are two pairs of movable levers, which are installed on the base through a rotating shaft, and one side of the movable lever has an inwardly recessed recess, a mounting hole is provided at the upper end of the recess, and an abutment bearing is installed at the lower end; a group of feed bearings are installed in the mounting holes on the same side, which are used to push the steel plate workpiece inward to form an acute angle for interference fit; the initial position of the abutment bearing is located on the downward pressure path of the upper mold and corresponds to the lever arm loading baffle, the lower edge of the movable lever is processed into a certain angle, and the lower edge is flush with the base when the movable lever swings inward around the rotating shaft at the extreme position.

[0006] A sliding sleeve matching the rotating shaft is installed in the long through hole, and the movable force arm is fixed to the rotating shaft.

[0007] The steel plate workpiece is placed on two feed bearings in the initial position.

[0008] The sharp-angle protrusion of the upper die ensures that after the upper die is released, the steel plate workpiece rebounds to a right angle by itself.

[0009] The upper die is connected to a hydraulic device, and the hydraulic device controls the vertical up and down reciprocating motion and pressure maintenance.

[0010] The feeding bearing is a sliding bearing.

[0011] Compared with the prior art, the utility model has the following beneficial technical effects:

[0012] The utility model solves the shortcomings of the prior art that the U-shaped ring angle is not compliant due to the influence of the mold when making the steel plate U-shaped ring, which leads to difficulty in demoulding. The hydraulic mold can perform angle interference processing on the steel plate in the later process of bending, so that the right angle interference of the steel plate is an acute angle, and the steel plate will rebound to a right angle by itself when demoulding. In addition, the hydraulic mold is easy to demould, which effectively avoids the difficulty of demoulding caused by mold expansion after the U-shaped ring is produced, and avoids damage to the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the hydraulic mold of the utility model;

[0014] Figure 2 This is a schematic diagram of the initial position when the utility model is used;

[0015] Figure 3 This is a schematic diagram of the downward pressing state when the utility model is in use;

[0016] Figure 4 This is a schematic diagram of the rebound state when the utility model is in use;

[0017] In the figure, 1, upper die; 2, base; 3, movable lever arm; 4, lever arm loading baffle; 5, rotating shaft; 6, feed bearing; 7, abutment bearing; 8, lower edge; 9, steel plate workpiece; 10, notch. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the accompanying drawings and specific embodiments.

[0019] The utility model hydraulic mold is used for U-shaped processing of steel plate workpiece 9, including upper mold 1, base 2 and active force arm 3; the bottom corner of the upper mold 1 is rounded and protrudes at an acute angle to ensure that the steel plate workpiece 9 rebounds to a right angle by itself after the upper mold 1 is demoulded; a force arm loading baffle 4 is horizontally welded on the front and rear sides of the upper mold 1, and the upper mold 1 is connected to the hydraulic device, which controls the vertical up and down reciprocating motion and pressure maintenance; the interior of the base 2 is a groove matching the shape of the bottom of the upper mold 1, and two long through holes are parallelly opened on both sides of the groove, and sliding sleeves matching the rotating shaft 5 are installed in the long through holes, and the active force arm 3 is fixed to the rotating shaft 5; there are two pairs of active force arms 3, It is installed on the base 2 through the rotating shaft 5, and one side of the movable lever 3 has an inwardly recessed recess 10, an installation hole is provided at the upper end of the recess 10, and an abutment bearing 7 is installed at the lower end; a group of feed bearings 6 are installed in the installation holes on the same side, which are used to push the steel plate workpiece 9 inward to form an acute angle for interference fit, and the feed bearing 6 is a sliding bearing; the initial position of the abutment bearing 7 is located on the downward pressure path of the upper mold 1 and corresponds to the lever loading baffle 4, and the lower edge 8 of the movable lever 3 is processed into a certain angle. When the movable lever 3 swings inward around the rotating shaft 5 at the extreme position, the lower edge 8 is flush with the base 2, and the steel plate workpiece 9 is placed on two feed bearings 6 at the initial position.

[0020] Before use, the upper die 1 is tested to determine the appropriate acute angle protrusion to ensure that after the upper die 1 is removed, the steel plate workpiece 9 rebounds to a right angle. When in use, first place the steel plate workpiece 9 on the two feeding bearings 6 and symmetrically on both sides. At this time, the abutment bearing 7 is located on the downward pressure path of the upper die 1 and below the force arm loading baffle 4. This is the initial position. Figure 2 Then the hydraulic device is turned on to drive the upper die 1 to press down. During the pressing process, the arm loading baffle 4 contacts the abutment bearing 7 of the active arm 3, thereby driving the active arms 3 on both sides to swing and rotate inward around the rotating shaft 5. This is the pressing state. Figure 3 As shown in the figure, when the rotation occurs, the feed bearing 6 of the active arm 3 pushes the steel plate workpiece 9 back inward, so that the steel plate workpiece 9 becomes an acute angle for interference, and the pressure is maintained. After the pressure is maintained, the upper die 1 is driven by the hydraulic device to lift the die upward, and the steel plate workpiece 9 will rebound by itself, from the acute angle to a right angle, and a medium-thick steel plate U-shaped ring with a right-angle structure is obtained. This is the rebound state, as shown in the figure. Figure 4 The utility model can not only ensure that the angle of the U-shaped ring of the produced medium and thick steel plate is unified as a compliant right angle, which is convenient for later installation and use, but also can avoid the expansion of the mold caused by rebound deformation, facilitate demoulding, effectively protect the mold, and extend the service life of the mold.

Claims

1. A hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates, used for U-shaped processing of steel plate workpieces, characterized by: It includes an upper mold, a base and a movable lever; the bottom corner of the upper mold is rounded and protrudes at an acute angle, and a lever loading baffle is horizontally welded on the front and rear sides respectively; the interior of the base is a cavity matching the shape of the bottom of the upper mold, and two long through holes are opened in parallel on both sides of the cavity; there are two pairs of movable levers, which are installed on the base through a rotating shaft, and one side of the movable lever has an inward recess, an installation hole is opened at the upper end of the recess, and an abutment bearing is installed at the lower end; a group of feed bearings are installed in the installation holes on the same side, which are used to push the steel plate workpiece inward to form an acute angle for interference fit; the initial position of the abutment bearing is located on the downward pressure path of the upper mold and corresponds to the lever loading baffle, the lower edge of the movable lever is processed into a certain angle, and the lower edge is flush with the base when the movable lever swings inward around the rotating shaft at the extreme position.

2. The hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates according to claim 1 is characterized in that: A sliding sleeve matching the rotating shaft is installed in the long through hole, and the movable force arm is fixed to the rotating shaft.

3. The hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates according to claim 1 is characterized in that: The steel plate workpiece is placed on two feed bearings in the initial position.

4. The hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates according to claim 1 is characterized in that: The sharp-angle protrusion of the upper die ensures that after the upper die is released, the steel plate workpiece rebounds to a right angle by itself.

5. The hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates according to claim 1 is characterized in that: The upper die is connected to a hydraulic device, and the hydraulic device controls the vertical up and down reciprocating motion and pressure maintenance.

6. The hydraulic die for one-step forming of U-shaped rings of medium and thick steel plates according to claim 1 is characterized in that: The feeding bearing is a sliding bearing.

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