A back gauge for a CNC bending machine

Abstract

This invention provides a back gauge for a CNC bending machine, comprising a crossbeam and a set of connecting devices installed at both ends of the crossbeam. Each connecting device includes a back gauge connecting seat, a tilting base, and a guide rod bearing. The base of the back gauge connecting seat is located below the tilting base, and the two are coaxially connected by a horizontal shaft. The tilting base can rotate about this shaft, and the guide rod bearing is vertically fixed to the upper surface of the tilting base. A first guide rod bearing seat is fixedly provided at the bottom of one end of the crossbeam, and a second guide rod bearing seat, which can slide horizontally along the direction of the crossbeam, is provided at the bottom of the other end. The guide rod bearings of the two connecting devices are respectively inserted into the first and second guide rod bearing seats. Compared with the prior art where the back gauge is integrated and cannot be adjusted separately for height and forward / backward movement, this invention allows for direct, independent control, solving the problem of synchronization lag in synchronous belts and optimizing the high precision, synchronization accuracy, low noise, and smoother operation of the back gauge.

Description

Technical Field

[0001] This invention belongs to the field of back gauge technology for bending machines, and specifically relates to a back gauge for CNC bending machines. Background Technology

[0002] CNC bending machines use equipped molds (general or special molds) to bend cold metal sheets into workpieces of various geometric cross-sectional shapes. Designed for cold-rolled sheet metal processing, they are widely used in sheet metal bending in industries such as automobiles, aircraft manufacturing, light industry, shipbuilding, containers, elevators, and railway vehicles. Bending machines typically employ dedicated CNC systems, with the number of axes evolving from single-axis to 12-axis. The CNC system automatically controls the slider's running depth, slider tilt, back gauge movement (forward / backward / left / right), pressure tonnage, and slider approach speed. This allows the bending machine to easily perform actions such as slider downward movement, inching, continuous bending, pressure holding, return stroke, and mid-stroke stopping, completing multiple bends of the same or different angles in a single loading operation.

[0003] Traditional bending machines with 8+1 or 6+1 shafts typically use a separate, double-floor-mounted back gauge, consisting of two individual modules. This eliminates the need for a central crossbeam and employs an under-mounted Z1Z2 rail system, with each module moving left and right independently. While this individual control system is suitable for small machines and short-distance operations, it lacks a reliable control point in the middle when bending long plates, making bending prone to deviations from straightness and affecting straightness. Summary of the Invention

[0004] Objective of the invention: To overcome the shortcomings of existing technologies, this invention provides a back gauge for a CNC bending machine. This back gauge can achieve horizontal or vertical oblique pulling, has diverse adjustment functions, and offers high operating and synchronization accuracy.

[0005] Technical Solution: This invention provides a back gauge for a CNC bending machine, comprising a crossbeam and a set of connecting devices installed at both ends of the crossbeam. The connecting devices include a back gauge connecting seat, a tilting base, and a guide rod bearing. The base of the back gauge connecting seat is located below the tilting base, and the two are coaxially connected by a horizontal shaft. The tilting base can rotate about the shaft, and the guide rod bearing is vertically fixed to the upper surface of the tilting base. A first guide rod bearing seat is fixedly provided at the bottom of one end of the crossbeam, and a second guide rod bearing seat that can slide horizontally along the direction of the crossbeam is provided at the bottom of the other end. The guide rod bearings of the two connecting devices are respectively inserted into the first guide rod bearing seat and the second guide rod bearing seat.

[0006] As a preferred or improved solution:

[0007] The connecting device also includes a planar bearing located above the flip base and passing through the smooth rod bearing.

[0008] The back gauge connecting seat includes a base and vertical side walls at both ends of the base. The horizontal shaft passes through the interior of the flip base and is inserted into the side walls at both ends of the back gauge connecting seat, connecting the flip base and the back gauge connecting seat.

[0009] Alternatively, the back gauge connecting seat includes a base and vertical sidewalls at both ends of the base. There are two horizontal shafts, one end of which is inserted into the sidewall at one end of the back gauge connecting seat, and the other end is inserted into the sidewall of the flip base, connecting the flip base and the back gauge connecting seat.

[0010] Alternatively, the back gauge connecting seat includes a base and vertical side walls at both ends of the base. There are two horizontal shafts, one end of which is fixed to one of the two side walls of the flip base, or is integral with the two side walls. The other end of each horizontal shaft is inserted into the side walls at both ends of the back gauge connecting seat to connect the flip base and the back gauge connecting seat.

[0011] Alternatively, the back gauge connecting seat includes a base and vertical side walls at both ends of the base. There are two horizontal shafts, one end of which is fixed to one of the two side walls of the back gauge connecting seat, or is integral with the two side walls. The other end of each horizontal shaft is inserted into one of the two side walls of the flip base, connecting the flip base and the back gauge connecting seat.

[0012] The bottom surface of the flip base has an arc-shaped structure.

[0013] The first optical rod bearing seat is vertically inserted into the bottom of one end of the crossbeam; the bottom of the other end of the crossbeam is provided with an open groove, and the top is provided with a linear guide rail. Above the linear guide rail is a connecting plate that can slide along the guide rail. The second optical rod bearing seat is located in the groove, and its top is fixedly connected to the lower surface of the connecting plate.

[0014] At the top of this end of the crossbeam, a connecting sliding groove can be provided in the middle of the linear guide rail. The connecting piece between the second guide rod bearing seat and the connecting plate can slide in the connecting sliding groove, thereby enabling the connecting plate to drive the second guide rod bearing seat to slide.

[0015] The optical shaft bearing is fixed to the upper surface of the flip base by screws.

[0016] Several stop fingers are installed on the crossbeam.

[0017] When in use, the back gauge is fixedly installed through the back gauge connecting seat. Each back gauge connecting seat can be connected to a separate control device to control the movement of the two back gauge connecting seats respectively. This allows for asynchronous movement, thereby enabling the crossbeam to be pulled diagonally in the horizontal or vertical direction.

[0018] Beneficial effects: Compared with the existing technology where the back gauge is integrated and cannot be adjusted separately in height and forward / backward, the present invention can be directly separated from the control, which not only solves the problem of synchronization lag of the synchronous belt, but also optimizes the high precision and synchronization accuracy of the back gauge operation, and makes it smoother with low noise. Attached Figure Description

[0019] Figure 1 This is an overall installation diagram of the back gauge of the CNC bending machine of the present invention.

[0020] Figure 2 This is a schematic diagram of the back gauge structure of the CNC bending machine of the present invention.

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the other end of the crossbeam in the back gauge of the CNC bending machine of the present invention.

[0022] Figure 4 This is a perspective view of the back gauge of the CNC bending machine of the present invention. Detailed Implementation

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Example 1

[0025] A back gauge for a CNC bending machine, such as Figure 1-4 As shown, it includes a crossbeam 1 and a set of connecting devices installed at both ends of the crossbeam 1.

[0026] The connecting device includes a back gauge connecting seat 2, a tilting base 3, a plane bearing 4, and a smooth rod bearing 5. The base of the back gauge connecting seat 2 is located below the tilting base 3, and the two are coaxially connected by a horizontal shaft. The tilting base 3 can rotate around the horizontal shaft. The smooth rod bearing 5 is vertically fixed to the upper surface of the tilting base 3 by screws. The plane bearing 4 is located above the tilting base 3 and passes through the smooth rod bearing 5. The back gauge connecting seat 2 includes a base and vertical sidewalls at both ends of the base. The horizontal shaft passes through the interior of the tilting base 3 and its two ends are respectively inserted into the sidewalls at both ends of the back gauge connecting seat 2, connecting the tilting base 3 and the back gauge connecting seat 2. The bottom surface of the tilting base 3 has an arc-shaped structure.

[0027] A first guide rod bearing seat 6 is fixedly installed at the bottom of one end of the crossbeam 1, and a second guide rod bearing seat 7, which can slide horizontally along the beam direction of the crossbeam 1, is installed at the bottom of the other end. The guide rod bearings 5 ​​of the two connecting devices are respectively inserted into the first guide rod bearing seat 6 and the second guide rod bearing seat 7. Several stop fingers are also installed on the crossbeam 1.

[0028] The first guide rod bearing seat 6 is vertically inserted into the bottom of one end of the crossbeam 1. The other end of the crossbeam 1 has an open groove 8 at the bottom and a linear guide rail 9 at the top. Above the linear guide rail 9 is a connecting plate 10 that can slide along the guide rail. The second guide rod bearing seat 7 is located in the groove 8, and its top is fixedly connected to the lower surface of the connecting plate 10. At the top of this end of the crossbeam 1, a connecting member sliding groove penetrating the groove 8 can be provided in the middle of the linear guide rail 9. The connecting member between the second guide rod bearing seat 7 and the connecting plate 10 can slide within the connecting member sliding groove, thereby enabling the connecting plate 10 to drive the second guide rod bearing seat 7 to slide.

[0029] When the back gauge of the aforementioned CNC bending machine is in use, it is fixedly installed via the back gauge connecting seat 2, which is responsible for the overall horizontal or vertical movement of the back gauge. Each back gauge connecting seat 2 can be connected to a separate control device to control the movement of the two back gauge connecting seats 2 respectively.

[0030] When the rear gauge connecting seat 2 at one end moves upward while the other end remains stationary, the rotation of the flipping base 3 and the sliding of the second smooth rod bearing seat 7 along the beam of the crossbeam 1 caused by the connecting plate 10 adjust the center and achieve a slanted pull with one end higher than the other.

[0031] When the rear gauge connecting seat 2 at one end moves horizontally while the other end remains stationary, the smooth rod bearing 5 can rotate in the first smooth rod bearing seat 6 and the second smooth rod bearing seat 7. At the same time, the connecting plate 10 drives the second smooth rod bearing seat 7 to slide along the beam of the crossbeam 1, thereby adjusting the center and achieving a horizontal displacement at one end and a stationary position at the other end.

[0032] Therefore, the two ends of the back gauge can move asynchronously, thereby achieving the diagonal tension of the crossbeam in the horizontal or vertical direction.

[0033] The dual-drive back gauge servo motors drive the left and right back gauges respectively, and the dual-drive servo motors control the height. Because the center of the crossbeam is adjusted by the linear guide rail 9 at one end, combined with the design of the flip base 3, the smooth rod bearing 5 and the smooth rod bearing seat, the back gauge crossbeam 1 can achieve diagonal pulling and can be controlled independently.

[0034] This new type of back gauge retains the original crossbeam design, and can add stop fingers in the middle at any time. It has obvious advantages for long plates. It can be servo controlled separately by X1, X2, R1, and R2. The parallelism of the crossbeam with the bending die can be adjusted arbitrarily. It can bend irregular triangles and can also correct the distance between the left and right stop fingers and the die.

[0035] Example 2

[0036] Same as Example 1, except that:

[0037] The back gauge connecting seat 2 includes a base and vertical sidewalls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is inserted into the sidewall at one end of the back gauge connecting seat 2, and the other end is inserted into the sidewall of the flip base 3, connecting the flip base 3 and the back gauge connecting seat 2.

[0038] Example 3

[0039] Same as Example 1, except that:

[0040] The back gauge connecting seat 2 includes a base and vertical side walls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is fixed to one of the two side walls of the flip base 3, or is integral with the two side walls. The other end of each horizontal shaft is inserted into the side walls at both ends of the back gauge connecting seat 2 to connect the flip base 3 and the back gauge connecting seat 2.

[0041] Example 4

[0042] Same as Example 1, except that:

[0043] The back gauge connecting seat 2 includes a base and vertical side walls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is fixed to one of the two side walls of the back gauge connecting seat 2, or is integral with the two side walls. The other end of each horizontal shaft is inserted into one of the two side walls of the flip base 3, connecting the flip base 3 and the back gauge connecting seat 2.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A back gauge for a CNC bending machine, characterized in that, The device includes a crossbeam (1) and a set of connecting devices installed at both ends of the crossbeam (1). The connecting devices include a back gauge connecting seat (2), a flip base (3), and a smooth rod bearing (5). The base of the back gauge connecting seat (2) is located below the flip base (3). The two are coaxially connected by a horizontal axis, and the flip base (3) can rotate about the horizontal axis. The smooth rod bearing (5) is vertically fixed to the upper surface of the flip base (3). A first smooth rod bearing seat (6) is fixedly provided at the bottom of one end of the crossbeam (1), and a second smooth rod bearing seat (7) is provided at the bottom of the other end, which can slide horizontally along the beam direction of the crossbeam (1). The smooth rod bearings (5) of the two connecting devices are respectively inserted into the first smooth rod bearing seat (6) and the second smooth rod bearing seat (7).

2. The back gauge of the CNC bending machine according to claim 1, characterized in that, The connecting device also includes a planar bearing (4) located above the flip base (3) and passing through the light rod bearing (5).

3. The back gauge of the CNC bending machine according to claim 1, characterized in that, The back gauge connecting seat (2) includes a base and vertical side walls at both ends of the base. The horizontal shaft passes through the interior of the flip base (3) and is inserted into the side walls at both ends of the back gauge connecting seat (2) to connect the flip base (3) and the back gauge connecting seat (2).

4. The back gauge of the CNC bending machine according to claim 1, characterized in that, The back gauge connecting seat (2) includes a base and vertical side walls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is inserted into the side wall at one end of the back gauge connecting seat (2), and the other end is inserted into the side wall of the flip base (3), connecting the flip base (3) and the back gauge connecting seat (2).

5. The back gauge of the CNC bending machine according to claim 1, characterized in that, The back gauge connecting seat (2) includes a base and vertical side walls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is fixed to the two side walls of the flip base (3) or is integral with the two side walls of the flip base (3). The other end of each horizontal shaft is inserted into the side walls at both ends of the back gauge connecting seat (2) to connect the flip base (3) and the back gauge connecting seat (2).

6. The back gauge of the CNC bending machine according to claim 1, characterized in that, The back gauge connecting seat (2) includes a base and vertical side walls at both ends of the base. There are two horizontal shafts. One end of each horizontal shaft is fixed to the two side walls of the back gauge connecting seat (2) or is integral with the two side walls of the back gauge connecting seat (2). The other end of each horizontal shaft is inserted into the two side walls of the flip base (3) to connect the flip base (3) and the back gauge connecting seat (2).

7. The back gauge of the CNC bending machine according to claim 1, characterized in that, The bottom surface of the flip base (3) has an arc-shaped structure.

8. The back gauge of the CNC bending machine according to claim 1, characterized in that, The first optical rod bearing seat (6) is vertically inserted into the bottom of one end of the crossbeam (1); the other end of the crossbeam (1) has an open groove (8) at the bottom and a linear guide rail (9) at the top. A connecting plate (10) that can slide along the guide rail is provided above the linear guide rail (9). The second optical rod bearing seat (7) is located in the groove (8) and its top is fixedly connected to the lower surface of the connecting plate (10). At the top of the other end of the crossbeam (1), a connecting sliding groove with a through groove (8) is provided in the middle of the linear guide rail (9). The connecting parts of the second light rod bearing seat (7) and the connecting plate (10) can slide in the connecting sliding groove, thereby enabling the connecting plate (10) to drive the second light rod bearing seat (7) to slide.

9. The back gauge of the CNC bending machine according to claim 1, characterized in that, The smooth shaft bearing (5) is fixed to the upper surface of the flip base (3) by screws.

10. The back gauge of the CNC bending machine according to claim 1, characterized in that, Several stop fingers are installed on the crossbeam (1).

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