A method for manufacturing a u-beam of a skid loader lift arm

Abstract

The application discloses a manufacturing method of a U-shaped beam of a lifting arm of a skid loader, and belongs to the technical field of mechanical manufacturing. The method can efficiently manufacture the U-shaped beam of the lifting arm of the skid loader, and has the characteristics of simple operation, high manufacturing efficiency and low production cost. The method comprises the following steps: (1) cutting and flattening a material plate according to a drawing; (2) bending and flanging the material plate by using a bending machine, and pressing the material plate; (3) after the two sides of the material plate after pressing are fixed, the two side flanges are aligned and welded, and the U-shaped beam of the lifting arm of the skid loader is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical manufacturing, more particularly to a manufacturing method of a U-shaped beam of a lifting arm of a skid steer loader. BACKGROUND

[0002] With the development of economy, people's demand for multifunctional engineering machinery is strong, and domestic demand is showing a rapid growth trend. Multifunctional skid steer loaders will become the products of large-scale production of major manufacturers around the world, and the competition will become more and more fierce. As a main structural part of the skid steer loader, the structure and production forming process of the U-shaped beam of the lifting arm are various. The structure of the U-shaped beam of the lifting arm of each brand of skid steer loader has its own characteristics and advantages. It has become a development trend to manufacture the U-shaped beam of the lifting arm with a beautiful and simple structure.

[0003] One of the existing U-shaped beams of the lifting arm has a shape as shown in Figure 1 The upper section of the U-shaped beam of the lifting arm is a U-shaped groove 1, and the depth of the groove gradually decreases from one end to the other end. The lower section is an arc-shaped groove 2 with a circular arc. Generally, the U-shaped groove and the arc-shaped groove are manufactured according to the size of the part, and then the U-shaped groove and the arc-shaped groove are welded to obtain the finished product. The U-shaped groove and the arc-shaped groove are usually punched out by using an oil press. However, due to the large size of the U-shaped groove and the arc-shaped groove, it is difficult to process these parts by using an oil press, and the equipment cost is high. The operator needs to align and fix the positions of the U-shaped groove and the arc-shaped groove before welding. It is difficult to align the U-shaped groove and the arc-shaped groove, and other fixtures need to be used for welding, which is low in working efficiency. In the welding process, displacement is easy to occur, which affects the welding precision. This makes the labor intensity of the operator large, and requires the operator to have high welding skills. The part can also be manufactured by making a mold according to the size of the part and then casting. However, such a manufacturing method requires a large amount of mold investment, which is not conducive to cost control.

[0004] Therefore, how to more efficiently manufacture the U-shaped beam of the lifting arm of the skid steer loader and control the cost is a new direction for future research. SUMMARY

[0005] The present application aims to provide a manufacturing method of a U-shaped beam of a lifting arm of a skid steer loader, which can efficiently manufacture the U-shaped beam of the lifting arm of the skid steer loader and has the characteristics of simple operation, high manufacturing efficiency and low production cost.

[0006] The technical scheme of the present application is as follows:

[0007] A manufacturing method of a U-shaped beam of a lifting arm of a skid steer loader, comprising the following steps:

[0008] (1) cutting and flattening the material plate according to the drawing;

[0009] (2) using a bending machine to bend and turn up the material plate, and press together;

[0010] (3) after the two sides of the material plate after pressing are fixed, the two side turn-ups are aligned and welded, and the material plate is obtained.

[0011] Further, in the step (1), the material plate is cut and blanked by using a laser cutting machine, and the material plate is flattened by using a leveling machine.

[0012] Further, in the step (2), the material plate is bent and turned up on both sides by using a bending machine, and then the bending upper die of the bending machine is replaced by an R20 bending upper die to press together the material plate along the center line of the material plate, and the inclined angle of the pressing is 10°.

[0013] Further, the angle of bending and turning up the material plate on both sides by using the bending machine is 90°.

[0014] Further, before the material plate is pressed by using the bending machine, the bending lower die is replaced by a bending lower die with an R20 accommodating groove at the center position.

[0015] Further, in the step (3), when the two sides of the material plate after pressing are fixed, one side of the material plate is fixed by a positioning surface, and the other side is fixed by a pressing device, and when the two side turn-ups of the material plate are welded, a hydraulic oil cylinder is used to press and position the two side turn-ups, and an automatic welding trolley is used for welding.

[0016] Further, when the material plate is fixed, a buffer rubber pad is placed between the positioning surface and the material plate and between the pressing device and the material plate.

[0017] Further, it further comprises a step (4) of cleaning the welding slag of the lifting arm U-shaped beam after welding.

[0018] Compared with the prior art, the present application has the beneficial effects that:

[0019] The manufacturing method of the present application can be completed only by using a bending machine, a hydraulic oil cylinder and an automatic welding trolley, the equipment investment cost is low, and the manufacturing cost is also reduced.

[0020] The whole manufacturing process is simple in operation, high in production efficiency and low in labor intensity of the operator.

[0021] Compared with the traditional manufacturing method of the lifting arm U-shaped beam, when the lifting arm U-shaped beam is manufactured by using the present manufacturing method, only the two side turn-ups of the material plate after pressing are fixed to align the two side turn-ups, and the alignment problem between the two plates during the welding process is not considered, which greatly reduces the operation difficulty and reduces the alignment time of the welding points and the use of tooling.

[0022] The lifting arm U-shaped beam manufactured by the manufacturing method has only one weld, and the structural strength is better; the welding of the flanges on both sides of the pressed material plate is completed by an automatic welding trolley, and there is no joint in the welding process, the material is more uniform, the comprehensive mechanical properties of the welding are effectively improved, the quality of the welding is more stable, the deformation of the lifting arm U-shaped beam is effectively controlled, and the manufactured lifting arm U-shaped beam has better quality.

[0023] The manufacturing method does not require workers to have high welding skills, reduces the manufacturing difficulty, and can better mass-produce. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 is a structural schematic view of a lifting arm U-shaped beam;

[0026] Figure 2 is a structural schematic view of a material plate cut during manufacturing of the lifting arm U-shaped beam;

[0027] Figure 3 is a structural schematic view of a material plate that has been flanged and pressed during manufacturing of the lifting arm U-shaped beam. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be further described in detail below in combination with specific embodiments, but do not constitute any limitation on the present application.

[0029] A manufacturing method of a lifting arm U-shaped beam of a skid loader, comprising the following steps:

[0030] (1) cutting and flattening a material plate according to a drawing.

[0031] The laser cutting machine is used for cutting, and the specific operation is as follows: according to the size specifications of the drawing, the shape to be cut is set in the laser cutting machine, and then the laser cutting machine is started to cut the desired shape in the metal plate according to the set cutting route. The shape of the cut material plate is as shown in Figure 2 The leveling machine is used to flatten the cut material plate, and the specific operation is as follows: the cut material plate is placed in the leveling machine for plate surface leveling.

[0032] (2) using a bending machine to bend and flange the material plate.

[0033] In this process, the material plate is bent and folded on both sides using a bending machine. Then, the bending upper die of the bending machine is replaced with an R20 bending upper die, and the material plate is pressed along the center line of the material plate. The pressing angle is 10° to facilitate the removal of the bending upper die.

[0034] from Figure 2 As can be seen, the cut material plate consists of two symmetrical trapezoids. During processing, each trapezoid is first pressed and flanged along the bending line near the outer hypotenuse of the trapezoid using a bending machine. Then, the two trapezoids are pressed together along the connecting line using another bending machine. The structure after pressing is as follows: Figure 3 As shown.

[0035] The material plate is bent and folded at an angle of 90° using a bending machine.

[0036] Before pressing the sheet metal with a bending machine, replace the lower bending die with a lower bending die that has an R20 accommodating groove in the center. When the upper bending die presses the sheet metal, the lower bending die can help press and position the sheet metal to prevent tearing during the deformation process.

[0037] (3) After pressing and fixing the two sides of the pressed material plate, make the two sides of the flange close together and align them. Then weld the two sides of the flange of the material plate to obtain the final product.

[0038] When pressing and fixing the two sides of the pressed material plate, one side of the material plate is fixed against the positioning surface and the other side is fixed against the pressing device. When welding the two sides of the material plate, the hydraulic cylinder is used to press and limit the side against the pressing device. By using the positioning surface and the hydraulic cylinder, the pressed material plate can be pressed and fixed so that the two sides of the flange are close and aligned. When welding, the welding gun angle and parameters are adjusted by the automatic welding carriage and then the welding is performed. The welding point of the automatic welding carriage is set at the point where the two sides of the flange of the material plate are close together.

[0039] When the material plate is pressed and fixed, buffer pads are placed between the positioning surface and the material plate, and between the pressing device and the material plate, to increase the friction between the positioning surface and the material plate, and between the pressing device and the material plate, to prevent displacement during welding, and to effectively protect the material plate from deformation under pressure.

[0040] Furthermore, step (4) involves cleaning the weld slag from the U-shaped lifting arm beam after welding.

[0041] The manufacturing method of this invention only requires a bending machine, a hydraulic cylinder, and an automatic welding carriage, resulting in low equipment investment costs and reduced manufacturing costs. The entire manufacturing process is simple to operate, highly efficient, and requires minimal labor intensity for operators.

[0042] Compared with the manufacturing method of the traditional lifting arm U-shaped beam, the U-shaped groove and the arc-shaped groove are aligned and then welded to be made, the U-shaped groove and the arc-shaped groove need to be aligned before welding, the alignment is difficult, time-consuming, and other fixtures need to be used during the welding process, the operation is difficult, in order to ensure the welding quality, two groove plates need to be cut at the same time during welding, and the precision is not enough due to the cutting error, when the lifting arm U-shaped beam is manufactured by using the manufacturing method, only one plate is cut, the flanging and pressing of the bending machine are performed, the flanges of the pressed plate are pressed and fixed on both sides to make the flanges on both sides close to each other and then welded, the mutual alignment between the two plates is not considered during the welding process, the operation difficulty is greatly reduced, and the alignment time of the welding points is also reduced, the positioning surface and the pressing device are used for fixation during welding, and a special alignment and fixation fixture is not needed;

[0043] The lifting arm U-shaped beam manufactured by the traditional method has two welds, the lifting arm U-shaped beam manufactured by using the manufacturing method has only one weld, and the structural strength is better; in the manufacturing method, the flanges on both sides of the pressed plate are welded by the automatic welding trolley, the welding process has no joint, the cutting is more uniform, the weld is more beautiful, the comprehensive mechanical properties of welding are effectively improved, the welding quality is more stable, the deformation of the lifting arm U-shaped beam is effectively controlled, the quality of the manufactured lifting arm U-shaped beam is better, and the labor intensity of the operators is also reduced;

[0044] The manufacturing method does not require operators to have high welding skills, the manufacturing difficulty is reduced, the manufacturing process of the whole lifting arm U-shaped beam has relatively low mold and equipment cost allocation, and is more conducive to large-scale production and manufacturing.

[0045] The above only describes the preferred embodiments of the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing a U-shaped beam for a skid steer loader lifting arm, characterized in that, Includes the following steps: (1) Cut the material according to the drawing and flatten it to obtain the material plate; (2) Use a bending machine to bend, fold, and press the material plate; (3) After pressing and fixing the two sides of the pressed material plate, align the two side flanges together, and then weld the two side flanges of the material plate to obtain the final product. In step (2), the material plate is bent and flanged on both sides using a bending machine. Then, the bending upper die of the bending machine is replaced with an R20 bending upper die, and the material plate is pressed along the center line of the material plate. The angle of the pressing is 10°. Before pressing the sheet metal together using a bending machine, replace the lower bending die with a lower bending die that has an R20 accommodating groove in the center. In step (3), when pressing and fixing the two sides of the pressed material plate, one side of the material plate is fixed against the positioning surface and the other side is fixed against the pressing device. When welding the two sides of the material plate, the hydraulic cylinder is used to press and limit the side against the pressing device. The welding is performed by an automatic welding trolley.

2. The method for manufacturing a U-shaped beam for a skid steer loader lifting arm according to claim 1, characterized in that, In step (1), a laser cutting machine is used to cut the material, and a leveling machine is used to flatten the material plate.

3. The method for manufacturing a U-shaped beam for a skid steer loader lifting arm according to claim 1, characterized in that, The material plate is bent and folded at an angle of 90° using a bending machine.

4. A method for manufacturing a U-shaped beam for a skid steer loader lifting arm according to claim 1, characterized in that, When the material plate is pressed and fixed, buffer pads are placed between the positioning surface and the material plate, and between the pressing device and the material plate.

5. A method for manufacturing a U-shaped beam for a skid steer loader lifting arm according to any one of claims 1-4, characterized in that, It also includes step (4) cleaning the weld slag from the U-shaped lifting arm beam after welding.

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