Universal bending method for metal plate support

Abstract

The invention discloses a universal bending method for a sheet metal support, which comprises the following steps of: counting R values at the bending parts of sheet metal support parts and a bending angle between two bending molded surfaces to form a series consisting of the R values and the bending angles, and processing a plurality of bending cutters corresponding to the R values, the method comprises the following steps: machining a bending mold cavity with a corresponding bending angle and R value on a same bending mold base, designing an unfolded shape of a sheet metal bracket part, overturning two bending molded surfaces of the sheet metal bracket part in a sheet metal bracket part drawing along a bending line until the two bending molded surfaces are coplanar to form a bending main body, and designing a positioning block and a connecting block to form a bending main body; the metal plate support part is cut and blanked according to the designed unfolded shape, then is bent through a bending tool and a bending die base, and finally is cut off at the position of a connecting block. The machining method is suitable for machining various metal plate support parts with different sizes, is particularly suitable for a multi-variety and small-batch production organization mode, and is low in machining cost and high in machining efficiency.

Description

Technical Field

[0001] The invention belongs to the field of aero-engine sheet metal forming, and in particular is a universal bending die for a sheet metal bracket and a bending method thereof. Background Art

[0002] The structure of aircraft engines is complex, and the connection methods between various structures are mainly non-detachable welding and detachable stud nut connection. Sheet metal brackets are the main accessories for threaded nut connection and are currently indispensable in aircraft engines. Their typical parts structure is as follows: Figure 1 As shown. Usually, this type of parts has many part numbers, different shapes, simple structures but high dimensional accuracy requirements. Generally speaking, there are two process solutions:

[0003] The first method is to bend the plate to the required angle of the bracket, and then use a five-axis laser cutting machine to process its shape and bottom hole. For holes with higher precision requirements, wire cutting is used to process the holes to the final required size.

[0004] The second method is to calculate the cutting size according to the size of the bracket and cut the material, and then use a special bending mold to bend it to obtain the part.

[0005] Both of the above solutions are not economical. Solution 1 involves five-axis machining, and Solution 2 requires a dedicated mold for each part number, and the processing cycle is relatively long.

[0006] In order to improve the processing efficiency of parts and reduce costs, it is urgent to study a universal processing device and method for processing radius bracket parts. Summary of the invention

[0007] The present invention aims to provide a universal bending method for sheet metal brackets, which is suitable for processing sheet metal bracket parts of various sizes, and is particularly suitable for a multi-variety and small-batch production organization mode, with low processing cost and high processing efficiency.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A universal bending method for a sheet metal bracket comprises the following steps:

[0010] S1, count the R value of the bending part of the sheet metal bracket part and the bending angle between the two bending surfaces to form a series consisting of R value and bending angle;

[0011] S2, processing bending tools and bending mold bases, processing a series of bending tools with tool head profiles equal to corresponding R values ​​according to the R value series in S1, processing multiple bending cavities with corresponding R values ​​and bending angles on the same bending mold base according to the R value series and bending angle series in S1, and processing positioning holes on the mold surface outside the bending cavity;

[0012] S3, sheet metal bracket part unfolding shape design, the sheet metal bracket part in the sheet metal bracket part drawing is flipped along the bending line until the two bending surfaces are coplanar to form a bending body, and then it is executed in the following two cases:

[0013] Case 1: If the multiple sheet metal bracket parts to be processed are exactly the same, a positioning block is added on the same side of the multiple bending bodies. The side of the positioning block corresponding to the bending body is a positioning bevel. All positioning bevels are parallel to each other. Each bending body and the positioning bevel are connected by a connecting block, and a positioning hole is opened on the positioning block.

[0014] Case 2: If the multiple sheet metal bracket parts to be processed are not exactly the same, a positioning block is added on the same side of the multiple bending bodies. The side of the positioning block corresponding to the bending body is a positioning bevel. The positioning bevel is not completely parallel, so that the bending lines of different sheet metal bracket parts are collinear. Each bending body and the positioning bevel are connected by a connecting block, and a positioning hole is opened on the positioning block.

[0015] S4, cutting and blanking of sheet metal bracket parts, cutting on the sheet metal according to the unfolded shape of the sheet metal bracket parts designed in S3, to obtain a rough material including a plurality of bending bodies, a positioning block and a plurality of connecting blocks;

[0016] S5, bending, select the corresponding bending tool and bending die base according to the R value series and bending angle series, put the rough material prepared in S4 into the bending die base, fix the rough material through the positioning holes on the bending die base and the positioning holes on the rough material positioning block, and press the tool head of the bending tool down into the bending cavity of the bending die base to complete the bending of the sheet metal bracket parts;

[0017] S6, trimming, lifting the bending tool, taking the sheet metal bracket part out of the bending die base, cutting off the connection with the positioning block from the connecting block, and obtaining the final sheet metal bracket part.

[0018] As an option, in S2, the bending mold base is a cube, and the four surfaces of the cube are processed with bending cavities.

[0019] As an option, in S2, a handle ear is connected to the surface of the bending mold base without the bending cavity.

[0020] As an option, in S4, laser cutting is adopted, and burrs on the edge of the rough material are removed after cutting.

[0021] As an option, in S6, the connection block is removed by grinding.

[0022] Compared with the prior art, the processing method provided by the present invention can process several completely identical or non-completely identical parts at one time. All parts can be processed by simply changing the shape and size of the sheet metal bracket parts in the unfolded shape design process. When processing different sheet metal bracket parts, no additional new molds are required, and no five-axis processing is involved, which can greatly reduce the tooling cost and processing cycle of sheet metal bracket parts development. In the case that only one sheet metal bracket part is needed for each sheet metal bracket part, it is even possible to process several different sheet metal bracket parts at one time, making full use of each piece of material and reducing material costs. The present invention is particularly suitable for a multi-variety and small-batch production organization model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a typical structural diagram of sheet metal bracket parts;

[0024] Figure 2 It is a schematic diagram of a universal bending die base and a bending tool;

[0025] Figure 3 It is a schematic diagram of a mechanical bending device for a universal bending die;

[0026] Figure 4 This is a schematic diagram of blank cutting when multiple sheet metal bracket parts are exactly the same;

[0027] Figure 5 This is a schematic diagram of blank cutting when multiple sheet metal bracket parts are not exactly the same;

[0028] In the figure, 1-connecting block, 2-positioning block, 3-bent body, 4-positioning bevel, 5-positioning hole. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0030] like Figures 2-3 As shown, the universal bending device designed for the present invention includes a bending mold base, a bending tool and a mechanical bending device.

[0031] The basic idea of ​​the universal bending method of the sheet metal bracket of the present invention is as follows:

[0032] 1. Count the R value and bending angle of the bent sheet metal bracket parts;

[0033] 2. According to the statistical R value and angle size, press Figure 2As shown, bending tools with different R values ​​(the tool head contour corresponds to the R pointer) and bending die bases are processed;

[0034] 3. Design the shape and size of the raw material for the bent sheet metal bracket part drawing (i.e. Figure 1 The unfolded view in the lower right middle, at this time, the two bending surfaces have been flattened into a plane), and the rough material is referenced Figure 4 or Figure 5 There are two ways to draw the raw material cutting diagram;

[0035] 4. Cut the material along Figure 4 , Figure 5 Cut the outline according to the dimensions shown and remove the machining burrs;

[0036] 5. According to the R value of the sheet metal bracket parts and the bending angles of the two bending surfaces, select the corresponding bending mold base and bending tool, press Figure 3 As shown, the bending die base is clamped to the base of the mechanical bending equipment (i.e., the press), the sheet metal bracket parts are clamped to the bending die base, the screws at the positioning holes are tightened, the bending tool is installed to the actuating mechanism of the mechanical bending equipment, and then the sheet metal bracket parts are bent using the mechanical bending equipment;

[0037] 6. Remove the sheet metal bracket parts from the positioning edge of the rough material, then cut off the connecting block part and keep the sheet metal bracket parts.

[0038] A more detailed processing method implementation process is given below:

[0039] 1. Count the R value of the bending part of the sheet metal bracket and the bending angle between the two surfaces of the bending bracket (commonly used R values ​​are 4mm, 6mm and 10mm, and the angles are 90° and 82°).

[0040] 2. According to the statistical R value of the bending part of the sheet metal bracket parts and the angle size between the two bending surfaces, process bending tools of different sizes (i.e. three types of bending tools with R values ​​of 4mm, 6mm and 10mm respectively) and bending mold bases (i.e. a total of 6 bending cavities including [4mm, 90°], [4mm, 82°], [6mm, 90°], [6mm, 82°], [10mm, 90°], [10mm, 82°] are processed on one mold base, and the 6 bending cavities are distributed in a straight line), and mark the bending tool and the bending mold base (i.e. the corresponding R value and bending angle). The bending mold base is a cube, and the bending cavity can be processed on all four sides, so it is suitable for the bending of sheet metal brackets of different sizes, saving investment costs. Handle ears are added on both sides of the bending mold base for easy use, and positioning holes are processed outside the surface of the bending cavity to fix the parts.

[0041] 3. Design and expand the rough material shape and size for sheet metal bracket parts of a single specification, and refer to the rough material Figure 4 The method is to use two 2mm wide connection blocks 1 to connect with the positioning block 2. If the sheet metal bracket parts are of different specifications, Figure 5 In the manner shown, the front and rear positions and rotation angles of each bending body 3 (i.e., the final sheet metal bracket parts) need to be adjusted so that Figure 5 The bending lines of each bending body 3 are adjusted to be collinear (or at a uniform horizontal height) and consistent with the bending lines in the bending cavity of the bending mold base. The length of the positioning bevel 4 and the aperture of the positioning hole 5 on the positioning block are fixed sizes, which makes it easy to replace parts.

[0042] 4. Use laser cutting to cut materials, such as Figure 4 , Figure 5 As shown, laser cutting is performed according to the contour lines in the figure and the burrs generated by laser cutting are removed.

[0043] 5. According to the R value of the sheet metal bracket parts to be processed and the bending angles of the two bending surfaces, select the corresponding bending mold base and bending tool, press Figure 3 As shown, the bending die base is clamped to the base of the mechanical bending equipment and fixed, the rough material is clamped to the bending die base, the screws of the three positioning holes 3 are tightened, and the three bending tools are installed to the actuating mechanism of the mechanical bending equipment (hydraulic press) through the tool holder. The three bending tools are clamped in a straight line, and the actuating mechanism of the mechanical bending equipment is operated, that is, it moves downward to bend the rough material.

[0044] 6. After the bending is completed, remove the sheet metal bracket part (bending body 3) and the positioning block 2 from the bending mold base, and then grind off the connecting block part to obtain the sheet metal bracket part.

[0045] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For ordinary technicians in the field of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept of the present invention are protected.

Claims

1. A universal bending method for a sheet metal bracket, characterized in that: The following steps are involved: S1, count the R value of the bending part of the sheet metal bracket part and the bending angle between the two bending surfaces to form a series consisting of R value and bending angle; S2, processing bending tools and bending mold bases, processing a series of bending tools with tool head profiles equal to corresponding R values ​​according to the R value series in S1, processing multiple bending cavities with corresponding R values ​​and bending angles on the same bending mold base according to the R value series and bending angle series in S1, and processing positioning holes on the mold surface outside the bending cavity; S3, sheet metal bracket part unfolding shape design, the sheet metal bracket part in the sheet metal bracket part drawing is flipped along the bending line until the two bending surfaces are coplanar to form a bending body, and then it is executed in the following two cases: Case 1: If the multiple sheet metal bracket parts to be processed are exactly the same, a positioning block is added on the same side of the multiple bending bodies. The side of the positioning block corresponding to the bending body is a positioning bevel. All positioning bevels are parallel to each other. Each bending body and the positioning bevel are connected by a connecting block, and a positioning hole is opened on the positioning block. Case 2: If the multiple sheet metal bracket parts to be processed are not exactly the same, a positioning block is added on the same side of the multiple bending bodies. The side of the positioning block corresponding to the bending body is a positioning bevel. The positioning bevel is not completely parallel, so that the bending lines of different sheet metal bracket parts are collinear. Each bending body and the positioning bevel are connected by a connecting block, and a positioning hole is opened on the positioning block. S4, cutting and blanking of sheet metal bracket parts, cutting on the sheet metal according to the unfolded shape of the sheet metal bracket parts designed in S3, to obtain a rough material including a plurality of bending bodies, a positioning block and a plurality of connecting blocks; S5, bending, select the corresponding bending tool and bending die base according to the R value series and bending angle series, put the rough material prepared in S4 into the bending die base, fix the rough material through the positioning holes on the bending die base and the positioning holes on the rough material positioning block, and press the tool head of the bending tool down into the bending cavity of the bending die base to complete the bending of the sheet metal bracket parts; S6, trimming, lifting the bending tool, taking the sheet metal bracket part out of the bending die base, cutting off the connection with the positioning block from the connecting block, and obtaining the final sheet metal bracket part.

2. A universal bending method for a sheet metal bracket according to claim 1, characterized in that: In S2, the bending mold base is a cube, and the four surfaces of the cube are processed with bending cavities.

3. A universal bending method for a sheet metal bracket according to claim 2, characterized in that: In S2, the surface of the bending mold base without the bending cavity is connected with a handle hanging ear.

4. A universal bending method for a sheet metal bracket according to claim 1, characterized in that: In S4, laser cutting is adopted, and burrs on the edge of the rough material are removed after cutting.

5. A universal bending method for a sheet metal bracket according to claim 1, characterized in that: In S6, the connection block is removed by grinding.

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