New car longitudinal beam CNC flat punch line

Closed-bed structure SPT120-12A car longitudinal beam CNC plate punching line is an efficient and high-precision machining equipment for punching holes in flats of automobile longitudinal beams, with very high stability and long service life.

SPT120-12A car longitudinal beam CNC plate punching line is a high-efficiency and high-precision plate automatic processing equipment designed for punching the longitudinal beam slab of automobile, and the positioning and feeding of feeding, cutting, and sheet materials. The selection of the mold, the realization of the stamping process, and the failure alarm can all be accomplished automatically through the control of the CNC system.

Equipment composition

Figure 1 shows the overall assembly of the production line equipment. SPT120-12A type flat CNC punching machine is special processing equipment for automobile longitudinal beam. It consists of the following components: host components, loading components, feeding/gripping components, loading/unloading tables, centering devices, hydraulic/pneumatic/lubrication systems, electrical and foundations, etc.

Figure 1 SPT120-12A car longitudinal beam CNC plate punch line

working principle

The SPT120-12A automobile longitudinal beam CNC plate punching line is moved from the feeding side to the feeding roller by the automatic feeding electromagnetic chuck. Firstly, the plate is positioned at the plate end. After the centering device aligns the plate material, the clamp clamps the plate material to determine the position of the plate material in the machine coordinate system. The X1 direction feed mechanism drives the workpiece to move. . Then, according to the program generated by the automatic programming, the X-axis and Y1-axis coordinated movements achieve the precise positioning of the punched hole, and the Y2 axis is controlled to complete the automatic die change. The hydraulic valve punching unit controls the main valve and controls the cylinder piston. Move up and down to achieve stamping of the sheet material. The processed waste is output from the chip conveyor to the scrap car. The finished product is clamped by blanking clamps, and the X2 direction feeding mechanism drives the workpiece to reach the designated position. The material pushing device pushes the blank from the blanking roller to the material storage frame on the feeding side and is lifted by the vehicle.

Key equipment

1. Feeding trolley and sucker feeding mechanism

There is an electric trolley on the feeding side of the machine. The electric trolley can be controlled to run out of the line by pressing a button. After loading the pallets for lifting, it is then run to the automatic feeding position and is ready to execute the automatic program.

The sucking plate feeding mechanism is a C-shaped structure of the automatic feeding part. The device completes the feeding action. The suction cup holder is equipped with 10 electromagnetic chucks for holding the plate material; the serial hydraulic cylinder ensures that the suction cup frame moves synchronously and the whole sucker device Front and rear lateral movement is driven by a horizontal hydraulic cylinder. The three precision linear guides run steadily to ensure the two ends are synchronized.

Electromagnetic chuck working characteristics: forward energization, demagnetization in the reverse direction, (suddenly) to maintain the electromagnetic force, thus ensuring safety and reliability.

After the electric-feeding trolley stops at the designated working position, the suction cup lowers the sheet material from the trolley and then rises. The sheet material is transported horizontally above the upper support roller, and then the sheet material is placed on the upper support roller, and then The suction cup returns to its initial position and waits for the signal to begin the next working cycle.

2. Feeding parts

It is composed of feeding table, X axis transmission mechanism, feeding clamp and centering positioning mechanism (Figure 2).

Figure 2 Feeding components, loading trolley, sucker loading total assembly

(1) Feeding table. The feeding table (Fig. 3) consists of a feeding rack, a feeding roll, a centering device, and a feeding clamp. The feeding rack is placed on the plane below the inner side of the C-shaped open bed of the feeding part, and the structure is simple and light. The adjustment foot is installed below the loading cradle, so that even if the bed is placed, the loading table can be easily leveled.

Figure 3 Feeding table

(2) The upper and the lower feeds into the clamps. The machine feeding table and the blanking table each have a clamp feeding mechanism (Figure 4), and the two structures are symmetrical. Feeding is driven by servo gear motor. When the board is moved and centered, it is fed into the clamp and pushes the sheet to the specified position. The front end of the board is positioned on the X2 axis clamp jaw. After moving in the center, the front end of the board is in position. The centering is completed. At this time, the open X1 clamp clamps the plate and is ready to feed into the punching hole; when the sheet reaches the discharge side of the main machine, the blank feeding starts to move, and the clamp clamps the sheet material. Motor control starts to feed.

Figure 4 feeding into the clamp (in the opposite direction of the clamp)

(3) Fix the alignment device. There are 5 sets of fixed centering positioning devices (Figure 5). Each set consists of a base plate, a motor transmission device, a two-way screw, a centering positioning column, a middle positioning hole pin and a scale. After the suction cup sucks the sheet onto the table, the fixed centering device and the moving centering device come into play.

Figure 5 Fixed centering device

The fixed centering device is fixed in the punching process of the workpiece (sheet material), and in order to meet the alignment requirements of different lengths of sheet material, we provide the user with five sets of centering positions that meet the customer's requirements. Reserve two sets of alignment stations for customers. The 5 sets of fixed centering devices are installed with independent control lines. According to the different lengths of the plates, the corresponding centering device is selected to match the movement of the front end of the plate material to perform the centering operation.

When it is centered, the motor controls the bidirectional screw to rotate, thereby driving the positioning column to move to the middle and complete alignment. The middle positioning hole pin is used for positioning when there is a positioning hole on the board, and the lower end scale is used as an auxiliary. After the alignment is completed, after the clamp clamps the sheet material, the fixed centering device is released and the original state is restored.

(4) Move the centering device. The structure and working principle of the centering part of the moving centering device (Fig. 6) is basically the same as the centering part of the fixed centering device, except that there is an additional cylinder and slider on the structure.

Figure 6 Mobile centering device

When the sheet material is in position, the centering and the fixed centering work at the same time. When the centering is completed, the fixed centering is restored to the original state, and the centering and holding state of the movable body remains unchanged. The moving centering device moves in the punching stage following the clamp feeding device, and after the two clamps clamp the plate material to perform pressing work, the centering portion of the moving centering device is restored to the original separated state and is dragged by the air cylinder. Back to the original position.

3. Host components

The main part of the SPT120-12A type is the closed hydraulic press (Fig. 7), which is mainly to complete the core function of the machine tool - punching. It consists of a closed bed, a mold magazine (Figure 8), a waste disposal device, and front and rear guides.

Figure 7 Host

Figure 8 mold assembly

The high strength of the closed bed ensures the accuracy and stability required for stamping.

As shown in Fig. 7, the middle part is the main oil cylinder, which is connected with the lead screw and the guide rail, and the lower end is connected with the combat head. The servo motor (Y1 axis) is connected to one end of the lead screw. The servo motor drives the main oil cylinder and the combat head to move on the guide rail. , select the lower die position, ready to punch.

Below the head is a die library, which is driven by a Y2 axis servo motor to position the die position. It is used in conjunction with the X-direction sheet feed to position and complete the hole position. After positioning, stamping work can be performed.

The bottom hopper is located in the bed, and the waste lands on the lower conveyor belt of the chip conveyor. The chip conveyor collects the waste into the waste trolley outside the bed.

4. Mold Library

The mold library is composed of upper and lower mold bases and 20 sets of molds, and the mold selection, punching position and punching work are completed through 3 movements. The first is the Y2 direction movement of the mold library. This movement completes the positioning of the mold along the width of the plate; then the Y1 direction of the host cylinder moves to move the main cylinder above the selected mold to prepare for punching; the mold selection is finally performed. Before and after a total of 2 rows of molds, each with a selection of cylinders and mold selection pad. Each time a mold is selected, only one mold selection block protrudes above one upper mold, indicating that the mold is selected.

The mold assembly is mainly composed of striking punches, upper and lower mold bases for mounting upper and lower molds, motors, guide rails, screw shafts, and mounting frames for carrying these parts. The connection between the upper and lower die holders is rigid, they can be moved together with the upper and lower molds; the gap between the lower die holders and the base is kept, the lower die holders are connected with the sliders through the connecting plates, and the bases are connected with the guide rails. In this way, relative sliding between the base and the lower mold base is achieved by sliding the slider and the guide rail. The punching force is borne by the pedestal, and the guide rail and the slider do not withstand the punching force to protect the guide rail and the slider from damage.

In the normal state (non-stamped state), the gap between the connecting plate and the transition plate is maintained by the tension of the disc spring and is greater than the gap between the base and the lower die holder. At the moment of punching, when the downward pressure increases to a degree sufficient to offset the tension of the disc spring, the gap between the base and the lower die seat is eliminated, and the gap between the connecting plate and the transition plate is greatly reduced; when the lower pressure becomes smaller and disappears, the die The seat rises under the tension of the disc spring until the gap between the connecting plate and the transition plate becomes small, and the gap between the base and the lower die seat recovers. This structure allows the punching force to be absorbed by the base, and the guide rail and the slider do not withstand the punching force. This structure facilitates automatic mold selection and also protects the rails and sliders from damage.

5. Model selection and stamping

As shown in FIG. 9 , two rows of screws and one positioning pin in the middle part connect the lifting die and the cylinder piston rod together, and the lifting die stamping block is connected with the lower pressing cylinder. The current position is the upper limit of the cylinder.

Figure 9 punching instructions

During punching, the mold library is driven by Y2 to the designated position, the power head also moves this position, the mold on one side pushes the pressing pad out of the mold handle, and the cylinder piston rod extends to drive the stamping block and pressing material. The cylinder moves downwards, so that the pad pushes the upper die downwards. When the punch reaches the lower limit, the small step of the punching block lifts the mold handle to pull up the mold when the punch reaches the lower limit and returns to the top dead point or selection. Die dead point, thus completing a punching action. Due to the mold library before and after the two rows, the selection of cylinders before and after the layout, respectively, to promote the movement of two pads to improve the combat efficiency.

6. Mold structure and installation

The upper mold used for this machine is a hanging upper mold. The mold is assembled in the mold handle, and the mold handle is assembled in the mold sleeve of the mold base. The mold handle has a built-in groove, and when the mold shank is moved up and down and positioned at the groove position, the mold handle can be tightly fixed here (the main oil tank changes the die top dead point). During work, after the mold is selected, the mold handle is pressed by the stamping block to break away from the upper die point of the mold change, and after flushing through the sheet material, it is sent back to the work dead point to return until the mold handle is returned to the upper dead point of the mold change and is positioned by the groove. Afterwards, you can continue to select models and other actions.

7. Guide device

The guiding device consists of guide posts, brackets, cylinders, and upper and lower rollers.

During the entire workpiece feeding process, the feeding roller of the material feed cylinder presses the upper and lower surfaces of the sheet material before the feed side clamp feed operation ends. In this way, the sheet material is clamped by the guide roller and the blanking clamp to ensure the continuity and smoothness of the punching action.

8. Blanking table and receiving rack

The blanking workbench consists of blanking table, blanking roller, blanking clamp, guiding device, automatic pushing device and receiving device. The feeding table is placed on the blanking base, and about 20 sets of blanking rollers are installed on the blanking table to form the worktable surface for conveying the blanks. The clamp feeding mechanism is installed here, and the rack and pinion transmission method is adopted. Guide rails. After the sheet has been processed, the clamps will automatically run to the proper loading position. At this point, the blanking jaws stop moving, the jaws open, and the pushing device moves to smoothly push the plate material into the receiving frame. The blanking table mainly provides a carrier for the installation of the clamp feeding device and the operation of the sheet material.

Hydraulic system

The hydraulic system oil of the machine is composed of two small hydraulic system oil circuits, namely the hydraulic system of the power head and the hydraulic system of the upper and the lower material. The main hydraulic cylinder of the power head hydraulic system is a compound cylinder with double speed and double force function, which not only improves punching efficiency, but also saves energy consumption. The main cylinder control valve is a German hydraulic servo control valve and position sensor, which can adjust the upper and lower running position of the slider to reduce the noise during stamping. This valve is equipped with a special control card. The position of the slider's rise and fall can be adjusted by adjusting the parameters on the control card.

The hydraulic system for loading and unloading consists of two clamp cylinder oil paths, one feeding oil path, and one auxiliary material oil path. The tandem cylinders form synchronized cylinders to ensure that the two lift cylinders move synchronously.

In the main hydraulic circuit of both sets of hydraulic systems, pressure detection switches and liquid level control relays are included. When the pressure of the system is high or the liquid level is lower than the bottom, the CNC system warns to protect the hydraulic system.

Conclusion

SPT120-12A automobile longitudinal beam CNC flat plate punching line is one of the most efficient numerical control flattened punching lines of the same type of sheet metal processing in China. It is easier to manufacture and assemble than the current open type bedding equipment. Closed bed It can guarantee the stability of equipment accuracy and the long-term life.