Horizontal pneumatic expanding and shrinking die of numerical control plate flanging machine

Abstract

The invention discloses a horizontal pneumatic expanding and shrinking die of a numerical control plate flanging machine, and relates to the technical field of plate flanging machines. Comprising an expanding and shrinking die body and a built-in air cylinder, the air cylinder drives a connecting rod to rotate and drives a front-back moving hinge lug to move along a front-back guide groove, and a left-right moving hinge lug moves along a left-right guide groove through a built-in spring. The die adopts pneumatic horizontal expansion and contraction actions, does not need to occupy the stroke of a sliding block, is higher in efficiency, avoids relative friction with a plate during downward pressing, ensures long-term stable use, effectively controls the product percent of pass, the use cost and the processing quality, and solves the problems that a conventional rotary expansion and contraction die is long in stroke, and workpieces and dies are easy to wear.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal folding machines, in particular to a horizontal pneumatic expansion and contraction die for a numerically controlled sheet metal folding machine. Background Art

[0002] The CNC sheet metal folding machine is a very important equipment in the field of sheet metal forming. It has the function of automatic multi-edge folding of sheet metal. After years of technological development, it has been widely used in many industries such as electric power, aerospace, home appliances, curtain wall, etc. The expansion and contraction die is one of the core components in the clamping die of the CNC sheet metal folding machine. Each device contains two sets of expansion and contraction dies. The main function is to achieve automatic avoidance during the processing. At the same time, after expansion, it can assist in clamping the edge of the sheet metal and improve the processing quality. At present, the conventional expansion and contraction die structure basically adopts the swing working form, such as Figure 3 The working principle diagram of the conventional rotary hinge ear in the figure shows that when processing the same workpiece, the initial height of the conventional rotary hinge mold 6 is higher than that of the present invention, mainly because its rotary ear is a drooping structure. In order to prevent the workpiece from rotating and hitting, it can only be opened higher. This will also make the upper and lower working strokes of each processing longer, resulting in lower overall efficiency. In addition, Figure 3 It can be seen that when approaching the upper surface of the workpiece, the hinge ear contacts the plate at a certain angle and presses down, which can easily scratch the plate and cause the workpiece to be scrapped and the mold to be damaged. Summary of the Invention

[0003] The technical problem solved by the horizontal pneumatic expansion and contraction die of a numerically controlled plate folding machine of the present invention is to overcome the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a horizontal pneumatic expansion and contraction mold of a CNC sheet metal folding machine, comprising an expansion and contraction mold body and a cylinder built into the expansion and contraction mold body, the cylinder comprising a cylinder body formed by an opening on the expansion and contraction mold body, a piston rod installed inside the cylinder body, a piston sealing ring at the rear end of the piston rod that fits in contact with the cylinder body, an outer end cover and an inner pressure cover and a guide ring installed at the front end, the end of the piston rod is connected to the connecting rod through a pin shaft, the lower part of the connecting rod is connected to the forward and backward moving hinge ear at the lower part of the expansion and contraction mold component through a connecting plate, the forward and backward moving hinge ear is embedded in the guide groove on the lower side of the expansion and contraction mold body, the linear motion of the cylinder drives the connecting rod to rotate and drive the forward and backward moving hinge ear to move along the forward and backward guide groove, and the left and right moving hinge ear will push the mold to move along the left and right guide groove through the built-in spring.

[0005] Furthermore, a guide ring is installed at the connection between the guide flange and the piston rod, and an end cover sealing ring is provided between the inner pressure cover and the piston rod.

[0006] Furthermore, the two ends of the connecting plate are respectively connected to the lower part of the connecting rod and the end of the hinge ear that moves forward and backward through connecting pins.

[0007] Further, the air cylinder in the expansion and contraction mold body is connected with an external air source, and the piston rod of the air cylinder in the expansion and contraction mold body drives the connecting rod to move forward and backward through the control of an electromagnetic valve.

[0008] Further, a left fixed flange is embedded in the outer circle inside the expansion and contraction mold body, a right flange connecting shaft passes through the left and right moving hinge ears and is connected with the left fixed flange through threads, and the spring arranged on the right flange connecting shaft is arranged inside the left and right moving hinge ears.

[0009] Further, the mold assembly composed of the pneumatic expansion and contraction mold is connected with a sliding block, and the mold assembly drives the whole to move up and down through the compression of the compression transmission component, and the mold assembly is expanded to bend and form the workpiece through the left and right moving hinge ears in the expansion and contraction mold component.

[0010] Further, the left and right moving hinge ears are provided with a wedge surface on the side close to the front and rear moving hinge ears, the front end of the front and rear moving hinge ears is provided with a matching inclined surface, and when the front and rear moving hinge ears move to the front side working position, the inclined surface is matched with the wedge surface and pushes the left and right moving hinge ears to move along the left and right guide grooves against the spring elastic force.

[0011] Further, the front and rear guide grooves are T-shaped groove structures, the upper part of the front and rear moving hinge ears is provided with a protruding part matched with the T-shaped groove, the protruding part is embedded in the T-shaped groove and can slide along the groove length direction, and the displacement of the front and rear moving hinge ears in the up and down direction is limited.

[0012] The horizontal expansion and contraction action of the pneumatic horizontal expansion and contraction action not only does not need to occupy the sliding block stroke, but also has higher efficiency, and the relative friction action with the plate is avoided when being pressed down, so that the long-term stable and damage-free use of the user can be ensured, and the product qualified rate, use cost and processing quality are effectively controlled; the horizontal expansion and contraction mold adopted by the present application can realize the horizontal translation of the hinge ear, and the plate has no relative friction during the up and down operation of the sliding block, so that the long-term operation loss of the mold is effectively reduced, and the service life of the mold is greatly improved; since the horizontal pneumatic expansion and contraction mold moves in the horizontal direction and does not affect the up and down stroke, the processing efficiency is also greatly improved compared with the conventional rotary movable ear structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic view of the structure of the present application installed on a flanging machine; Figure 2 It is a schematic view of the expansion and contraction mold processing action of the structure of the present application; Figure 3 It is a schematic view of the conventional rotary hinge ear; Figure 4 It is a schematic view of the expansion and contraction mold avoiding state of the structure of the present application; Figure 5 It is Figure 4The middle K to the expansion and contraction state diagram shows that the state is avoided; Figure 6 The expansion and contraction mold of the structure of the present application is shown in the working state diagram; Figure 7 For Figure 6 The middle M working state diagram shows that the state is avoided; Figure 8 The expansion and contraction mold of the structure of the present application is shown in the working state diagram; Figure 9 The expansion and contraction mold of the structure of the present application is shown in the working state diagram;

[0014] In the figure: 1, expansion and contraction mold part; 2, mold assembly; 3, compression transmission part; 4, slider; 5, workpiece; 6, conventional rotary hinge mold; 7, expansion and contraction mold body; 8, left fixed flange; 9, spring; 10, right flange connecting shaft; 11, left and right moving hinge ear; 12, front and rear moving hinge ear; 13, end cover sealing ring; 14, guide ring; 15, piston rod; 16, pin shaft; 17, connecting rod; 18, connecting plate; 19, connecting pin; 20, outer end cover; 21, inner pressure cover; 22, guide flange; 23, piston sealing ring; 24, left and right direction guide groove. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] Reference Figures 1-9 The embodiment provides a numerical control plate flanging machine horizontal pneumatic expansion and contraction mold, which comprises an expansion and contraction mold body 7 and a cylinder built in the expansion and contraction mold body 7. The cylinder comprises a cylinder body formed by a hole arranged on the expansion and contraction mold body 7, a piston rod 15 installed in the cylinder body, a piston sealing ring 23 attached to the cylinder body at the rear end position of the piston rod 15, an outer end cover 20 and an inner pressure cover 21 installed at the front end, and a guide ring 14. The end of the piston rod 15 is connected with a connecting rod 17 through a pin shaft 16. The lower part of the connecting rod 17 is connected with the lower part of the expansion and contraction mold part through a connecting plate 18. The front and rear moving hinge ear 12 is embedded in the guide groove on the lower side of the expansion and contraction mold body. The linear motion of the cylinder drives the connecting rod 17 to rotate and drive the front and rear moving hinge ear 12 to move along the front and rear direction guide groove. The left and right moving hinge ear 11 is pushed along the left and right direction guide groove 24 by the built-in spring to move the mold.

[0017] The guide ring 14 is installed at the connection between the guide flange 22 and the piston rod 15. The end cover sealing ring 13 is arranged between the inner pressure cover 21 and the piston rod 15.

[0018] The connecting plate 18 is connected with the lower part of the connecting rod 17 and the end of the front and rear moving hinge ear 12 through the connecting pin 19.

[0019] The cylinder inside the expansion and contraction die body 7 is connected with the external air source, and the piston rod 15 of the built-in cylinder in the expansion and contraction die body 7 drives the connecting rod 17 to move forward and backward through the control of the electromagnetic valve.

[0020] The left fixed flange 8 is embedded in the expansion and contraction die body 7 through external circle positioning, the right flange connecting shaft 10 is connected with the left fixed flange 8 through the thread connection of the left and right moving hinge ear 11, and the spring 9 placed on the right flange connecting shaft 10 is installed inside the left and right moving hinge ear 11.

[0021] The mold assembly 2 composed of the pneumatic expansion and contraction die is connected with the sliding block 4, and the whole is driven to move up and down by the compression transmission part 3 to work, the mold assembly 2 is expanded to bend and form the workpiece 5 through the left and right moving hinge ear 11 in the expansion and contraction die part 1.

[0022] The left and right moving hinge ear 11 is provided with a wedge surface close to the side of the front and rear moving hinge ear 12, the front end of the front and rear moving hinge ear 12 is provided with a matching inclined surface, when the front and rear moving hinge ear 12 moves to the front side working position, the inclined surface is matched with the wedge surface and pushes the left and right moving hinge ear 11 to move along the left and right direction guide groove 24 against the spring 9 elastic force.

[0023] The front and rear direction guide groove is a T-shaped groove structure, the upper part of the front and rear moving hinge ear 12 is provided with a protruding part matched with the T-shaped groove, the protruding part is embedded in the T-shaped groove and can slide along the length direction of the groove, and the displacement of the front and rear moving hinge ear 12 in the up and down direction is limited.

[0024] The mold assembly 2 is in the upper limit position, 100 mm away from the upper surface of the workpiece, the front and rear moving hinge ear 12 is in the rear limit position, 50 mm away from the front end face, the left and right moving hinge ear 11 is in the retracted position under the thrust of the spring 9, the total width is 10 mm narrower than the maximum edge of the workpiece, the cylinder is not vented, and the piston rod 15 is in the left limit position. The control system issues an instruction, the electromagnetic valve is powered to vent the left cavity of the cylinder, the piston rod 15 pushes the connecting rod 17 to rotate clockwise by 30° around the pin shaft 16, and drives the front and rear moving hinge ear 12 to move forward along the front and rear guide groove through the connecting plate 18; at this time, the inclined surface of the front and rear moving hinge ear 12 is in contact with the wedge surface of the left and right moving hinge ear 11, and the left and right moving hinge ear 11 is driven to move outward along the left and right guide groove 24 against the elastic force of the spring 9. The compression transmission component 3 drives the sliding block 4 to drive the mold assembly 2 to move downward, and stops when it is 1 mm away from the upper surface of the workpiece; at this time, the lower surface of the left and right moving hinge ear 11 is in contact with the edge of the workpiece 5, so that the plate material is ensured to have no slip; the workpiece is driven by the flanging machine to complete the 90°-160° flanging action, and the mold has no transverse displacement in the process. After the flanging is completed, the sliding block 4 drives the mold assembly 2 to move upward, the electromagnetic valve is reversed to vent the right cavity of the cylinder, the piston rod 15 is reset to the left, the connecting rod 17 is counterclockwise rotated, and the front and rear moving hinge ear 12 is retreated backward; the left and right moving hinge ear 11 is reset to the retracted position under the thrust of the spring 9, and the total width of the mold returns to the initial value, and is ready for the next cycle.

[0025] As shown in Figure 1 , the mold assembly 2 is connected with the sliding block 4, and the whole is driven to move up and down by the compression transmission component 3.

[0026] As shown in Figure 1 and Figure 2 , it can be seen that after the workpiece 5 is bent and formed left and right, the mold assembly 2 is retracted by the left and right moving hinge ear 11 in the expansion and contraction mold component 1, so that the total length of the whole mold assembly 2 is shortened, and then the mold assembly 2 is pressed downward, at this time, the part of the workpiece 5 which has been bent does not interfere with the mold assembly 2, and when the mold assembly 2 approaches the upper surface of the workpiece, the hinge ear 11 is expanded to prepare for processing; As shown in Figure 6 and 7 , the main working principle is that the piston rod 15 in the expansion and contraction mold body 7 drives the connecting rod 17 to move forward and backward through the electromagnetic valve control, the hinge point is connected through the pin shaft 16, the lower part of the connecting rod is connected with the connecting plate 18 through the connecting pin 19, the connecting plate 18 is connected with the front and rear moving hinge ear 12 through the pin, Figure Five The right side K view is the hinge ear expansion and contraction avoidance state, the main action is that the piston rod 15 is vented on the left side, the front and rear moving hinge ear 12 is driven to move along the Figure 8The front and rear guide slots on the middle expansion and contraction die body 7 move to the designated position on the rear side, the built-in cylinder seal is ensured by the cooperation of the inner pressure cover 21 and the outer end cover with the seal ring, and the guide ring 14 ensures the smoothness of the left and right movement of the piston rod.

[0027] As shown in Figure 4 and 5 , the main action principle is that the piston rod 15 is ventilated on the right side, and the front and rear moving hinge ears 12 are moved to the front side by the connecting rod 17 and the connecting plate 18.

[0028] As shown in Figure 8 , the left fixed flange 8 is embedded in the expansion and contraction die body 7 through the outer circle positioning, and the right flange connecting shaft passes through the left and right moving hinge ears and is connected with the left fixed flange 8 through threads, the spring 9 is installed inside the left and right moving hinge ears, and when the front and rear moving hinge ears 12 are in the expansion and contraction avoidance position, the left and right moving hinge ears are pushed to the inner contraction position along the Figure 4 middle left and right guide slots by the spring Figure 8 , and when the front and rear moving hinge ears move to the front side working position, the left and right moving hinge ears are pushed to the rightmost end by the spring resistance against the cylinder thrust, and the mold realizes the expansion state.

[0029] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A horizontal pneumatic expansion and contraction die for a CNC sheet metal folding machine, characterized by: The invention comprises a telescopic mold body (7) and a cylinder built into the telescopic mold body (7), wherein the cylinder comprises a cylinder body formed by an opening on the telescopic mold body (7), a piston rod (15) installed inside the cylinder body, a piston sealing ring (23) at the rear end of the piston rod (15) in contact with the cylinder body, an outer end cover (20) and an inner pressure cover (21) installed at the front end, and a guide ring (14), wherein the end of the piston rod (15) is connected to the connecting rod (17) through a pin shaft (16), and the lower part of the connecting rod (17) is connected to the front-rear moving hinge ear (12) of the lower part of the telescopic mold component through a connecting plate (18), and the front-rear moving hinge ear (12) is embedded in the guide groove on the lower side of the telescopic mold body, and the linear motion of the cylinder drives the connecting rod (17) to rotate and drive the front-rear moving hinge ear (12) to move along the front-rear guide groove, and the left-right moving hinge ear (11) is pushed by the built-in spring to move the mold along the left-right guide groove (24).

2. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 1, characterized in that: A guide ring (14) is installed at the connection between the guide flange (22) and the piston rod (15), and an end cover sealing ring (13) is provided between the inner pressure cover (21) and the piston rod (15).

3. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 2, characterized in that: The two ends of the connecting plate (18) are respectively connected to the lower part of the connecting rod (17) and the end of the hinge ear (12) that moves forward and backward through the connecting pin (19).

4. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 3, characterized in that: The cylinder built into the expansion and contraction mold body (7) is connected to an external air source, and the piston rod (15) of the built-in cylinder on the expansion and contraction mold body (7) is controlled by a solenoid valve to drive the connecting rod (17) to move forward and backward.

5. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 4, characterized in that: A left fixed flange (8) is embedded in the expansion and contraction mold body (7) through an outer circle positioning, and a right flange connecting shaft (10) passes through the left and right movable hinge ears (11) and is connected to the left fixed flange (8) through a thread, and a spring (9) passing through the right flange connecting shaft (10) is installed on the inner side of the left and right movable hinge ears (11).

6. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 5, characterized in that: The mold assembly (2) formed by the pneumatic expansion and contraction mold assembly is connected to the slider (4), and the compression transmission component (3) drives the entire assembly to move up and down. The mold assembly (2) is expanded by moving the hinge ears (11) left and right in the expansion and contraction mold component (1) to bend and form the workpiece (5).

7. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 6, characterized in that: The left-right movable hinge ear (11) is provided with a wedge-shaped surface on one side close to the front-back movable hinge ear (12), and the front end of the front-back movable hinge ear (12) is provided with a matching inclined surface. When the front-back movable hinge ear (12) moves toward the front working position, the inclined surface abuts against the wedge-shaped surface and pushes the left-right movable hinge ear (11) to overcome the elastic force of the spring (9) and move along the left-right guide groove (24).

8. The horizontal pneumatic expansion and contraction die of a CNC sheet metal folding machine according to claim 7, characterized in that: The front-to-back guide groove is a T-slot structure. The upper portion of the front-to-back movable hinge ear (12) is provided with a protrusion adapted to the T-slot. The protrusion is embedded in the T-slot and can slide along the length of the slot, thereby limiting the displacement of the front-to-back movable hinge ear (12) in the up-down direction.

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