A method for automatically bending non-rectangular plates

Abstract

The present invention discloses an automatic bending processing method for non-rectangular plates. The method comprises the following steps: 1) inputting the geometric information of the slab into the system; 2) selecting the bending processing technology and processing size in the system interface; 3) placing the slab on a workbench and positioning it; 4) clamping the slab with a fixture, and the servo system driving the feeding mechanism to send the slab to the bending position, and automatically bending one edge thereof; 5) calculating the feeding distance and processing the other edges to be processed in turn until all edges are processed. An automatic bending processing method for non-rectangular plates in the present invention only needs to input the geometric data on the drawing into the system, and the feeding distance and bending size can be automatically calculated, and the processing can be completed in one positioning. Compared with the previous processing method of manually calculating the bending size or feeding distance, it not only greatly improves the processing efficiency, but also reduces the difficulty of operation, and is suitable for batch automated processing.

Description

Technical Field

[0001] The present invention relates to the field of bending processing, and in particular to an automatic bending processing method for non-rectangular plates. Background Art

[0002] Non-rectangular plates generally refer to plates with a non-rectangular main contour or a non-rectangular bottom surface after bending. Generally speaking, these products are usually processed using ordinary electro-hydraulic bending machines combined with forming molds. After bending once, they need to be manually flipped or offset to complete the processing. Different types of products often require molds of different specifications. In the existing technology, the corresponding mechanisms (such as the material stop mechanism) usually need to be positioned multiple times during the processing to complete the process.

[0003] In addition, when using a bending center to process non-rectangular plates, it is impossible to perform fully automatic bending processing on non-rectangular plates because the feed size cannot be calculated.

[0004] Therefore, the non-rectangular plate bending processing method in the existing technology cannot achieve automatic calculation and fully automatic bending, and requires multiple positioning to complete. Not only does it require a large amount of manual participation, resulting in low production and processing efficiency, but it also has high programming difficulty and is not suitable for batch processing. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides an automatic bending processing method for non-rectangular plates.

[0006] According to one aspect of the present invention, there is provided a method for automatically bending a non-rectangular plate, comprising the following steps:

[0007] 1) Input the geometric information of the slab into the system;

[0008] 2) Select the bending process and processing size in the system interface;

[0009] 3) Place the slab on the workbench and position it;

[0010] 4) Use a fixture to clamp the slab, the system automatically calculates the feeding distance, and automatically bends one edge;

[0011] 5) Calculate the feeding distance and process the other edges to be processed in turn until all edges are processed;

[0012] Among them, when the angle between the edge to be processed and other edges is not 90°, the feeding distance is K=OM-S; when the angle between the edge to be processed and other edges is 90°, the feeding distance is K=L / 2-S or W / 2-S.

[0013] An automatic bending processing method for non-rectangular plates in the present invention only needs to input the geometric data on the drawing into the system, and it can automatically calculate the feeding distance and bending size, and can complete the processing in one positioning. Compared with the previous processing method of manually calculating the bending size or feeding distance, it not only greatly improves the processing efficiency, but also reduces the operation difficulty, and is suitable for batch automated processing.

[0014] In some embodiments, in step 1), the geometric information of the slab is input according to the information provided by the processing drawing. This is beneficial in that it describes the specific basis for inputting the geometric information of the slab into the system.

[0015] In some embodiments, in step 1), the input geometric information includes the total length, length of each side, and tilt angle of the slab. This is beneficial in that it describes the specific type of the input geometric information of the slab.

[0016] In some embodiments, in step 2), the bending process includes ordinary bending, arc bending, and dead edge bending. The benefit is that it describes the specific types of bending processes that can be selected.

[0017] In some embodiments, each bending process includes two types: upward bending and downward bending. This is beneficial in that it further describes the selection types of bending processes.

[0018] In some embodiments, in step 4), when the system automatically calculates the feeding distance, the feeding mechanism is driven to feed the slab to the bending position. This is beneficial in that feeding the slab to the bending position facilitates the bending process.

[0019] In some embodiments, in step 5), a rotating device is used to rotate the slab so that the feeding distance is calculated and the other edges to be processed are processed in sequence. This is beneficial in that a method for processing each edge of the slab in sequence is described.

[0020] In some embodiments, when the angle between the edge to be processed and the other edge is not 90°, the calculation process of the feeding distance is:

[0021] ON = L / 2 - (L - AF);

[0022] AO = sqrt(EF*EF / 4+ON*ON);

[0023] ∠AON=arcTan(EF / 2*NO);

[0024] ∠AOM=∠AON-α;

[0025] OM=AO*cos∠AOM;

[0026] K=OM-S.

[0027] The benefit thereof lies in that the specific calculation process of the feeding distance is described. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of plate geometry information for an automatic bending process of a non-rectangular plate according to an embodiment of the present invention;

[0029] Figure 2 for Figure 1 The diagram shows a plate information input interface for an automatic bending processing method for non-rectangular plates;

[0030] Figure 3 for Figure 1 A schematic diagram of calculating the feeding distance of a plate in an automatic bending process of a non-rectangular plate according to an embodiment is shown. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Figure 1 The figure schematically shows the plate geometry information of a non-rectangular plate automatic bending processing method according to an embodiment of the present invention. Figure 2 Shows Figure 1 A plate information input interface for automatic bending processing of non-rectangular plates, Figure 3 Shows Figure 1 In one embodiment of the present invention, a non-rectangular plate automatic bending processing method is used to calculate the feeding distance of the plate. Figure 1-3 As shown in the figure, this processing method is achieved through the coordination of the bending machine, workbench, fixture and rotating device, as well as the use of a specially designed feeding distance calculation method.

[0033] The operation of this processing method mainly includes the following steps.

[0034] First, according to the processing drawing, the relevant geometric information of the slab to be processed is input into the operating system of the bending machine, where the input geometric information includes the total length of the slab, the length of each side and the corresponding inclination angle, etc.

[0035] like Figure 1 As shown, taking the non-rectangular slab to be processed as polygon ABCDEF as an example, it can be seen that the total width of the slab is W=EF=AD, and the distance from the oblique edge to the bottom edge of the slab is AF or ED.

[0036] Assume that the total length of the slab, that is, the distance from the BC side to the EF side, is L. During processing, the angle between the side to be processed and the horizontal line is α. When the angle between the side to be processed and the other sides is 90°, α=0.

[0037] And as Figure 2 As shown, in order to facilitate the operator's understanding, angle α is renamed as angle 1 or angle 2 in the input interface, and the length of the distance ED from the bevel to the bottom edge of the slab, the length of the total width EF of the slab, and the angle of angle 1 or angle 2 and other data can be entered in the information input interface.

[0038] Next, select the bending process and processing size in the system interface. Among them, the bending process includes normal bending, arc bending and dead edge bending, and each includes upward bending and downward bending.

[0039] The next step is to place the slab on the workbench of the bending machine and use positioning blocks to position it. When positioning, two axially symmetrically distributed L-shaped positioning blocks are used to clamp both sides of the slab, so that the plate can be located in the center of the largest enveloping rectangle for clamping.

[0040] In the next step, the slab is clamped with a fixture and each edge is automatically bent in turn.

[0041] Taking one of the edges as an example, the feeding distance needs to be calculated according to the algorithm program set up before processing. Among them, when the angle between the edge to be processed and other edges is 90° or not 90°, the method of calculating the feeding distance is different.

[0042] The calculation method of the feeding distance in the present invention is as follows.

[0043] like Figure 3 As shown, when calculating the feeding distance of side AB (the angle with other sides is not 90°), let the midpoint of L be O and the intersection of L and AD be N, then the distance between point O and point N is:

[0044] ON = L / 2 - (L - AF);

[0045] According to the Pythagorean theorem, we have:

[0046] AO = sqrt(EF*EF / 4+ON*ON);

[0047] Then ∠AON=arcTan(EF / 2*NO);

[0048] Draw a perpendicular line MO through point O, let ∠MON=β,

[0049] Then ∠AOM = ∠AON-β = ​​∠AON-α;

[0050] We can get OM = AO * cos ∠ AOM;

[0051] Assuming the expected bending length, that is, the size after bending, is S, then:

[0052] Feeding distance K = OM-S.

[0053] After calculating the feeding distance, the slab is transported to the designated position according to the feeding distance to complete the next bending process, that is, the AB edge is rotated to the position facing the bending knife. The rotation angle is α or α+n*90°, and the value of n needs to be determined according to which edge faces the bending knife during positioning.

[0054] In addition, when the angle between the calculated edge and other edges is 90°, the feeding distance = half of the slab length (width) - expected bending length, that is:

[0055] K = L / 2-S or W / 2-S.

[0056] After the processing of one edge is completed, the slab is rotated to the next specified edge using a rotating device, and the feeding distance of the edge is calculated again according to the feeding distance calculation method for bending processing. Finally, the feeding distance is calculated and processed for each edge to be processed of the slab in turn.

[0057] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A non-rectangular plate automatic bending processing method, characterized by: The following steps are included 1) Input the geometric information of the slab into the system, where the geometric information input includes the total length, length of each side and inclination angle of the slab; 2) Select the bending process and processing size in the system interface; 3) Place the slab on the workbench and position it; 4) Use a fixture to clamp the slab, the system automatically calculates the feeding distance, and automatically bends one edge of it; 5) Calculate the feeding distance and process the other edges to be processed in turn until all edges are processed; Among them, the slab is a polygon ABCDEF, W is the total width of the slab, that is, the length of AD and EF, L is the total length of the slab, that is, the distance from BC to EF, the midpoint of L is O, and the perpendicular line from point O to one side AB of the slab is OM, S is the expected bending length, the intersection of L and AD is N, and the angle between the side to be processed and the horizontal line is α; When the angle between the edge to be processed and other edges is not 90°, the calculation process of the feeding distance is: ON=L / 2 - (L - AF), AO=sqrt(EF*EF / 4+ON*ON), ∠AON=arcTan(EF / 2*NO), ∠AOM=∠AON-α, OM=AO*cos∠AOM, K = OM-S; When the angle between the edge to be processed and other edges is 90°, the feeding distance is K=L / 2-S or W / 2-S.

2. The method for automatically bending a non-rectangular plate according to claim 1, characterized in that: In step 1), the geometric information of the slab is input according to the information provided by the processing drawing.

3. The method for automatically bending a non-rectangular plate according to claim 1, characterized in that: In step 2), the bending process includes ordinary bending, arc bending and dead edge bending.

4. The method for automatically bending a non-rectangular plate according to claim 3, characterized in that: Each bending process includes two types: upward bending and downward bending.

5. The method for automatically bending a non-rectangular plate according to claim 3, characterized in that: In step 4), when the system automatically calculates the feeding distance, it drives the feeding mechanism to send the slab to the bending position.

6. The method for automatically bending a non-rectangular plate according to claim 1, characterized in that: In step 5), the slab is rotated by using a rotating device, so that the feeding distance and processing of other edges to be processed are calculated in turn.

Images