SU1286349A1 - Blank cutoff assembly to automatic presses - Google Patents

Abstract

The invention relates to the processing of metals by pressure, specifically to a tool for cutting and transferring blanks in automatic presses. The aim of the invention is to improve the quality of the cut blanks and increase productivity. In the shaped hole 10 of part 2 of the rezush, its element serves the bar until it stops. The tool body 1 is provided with a working movement (along the arrow), which is transmitted through levers 3 to the part 2 of the cutting element. Part 2, shuffled, and ed, act on the cut-off part of the rod and shift it relative to the rest of the rod. Under the action of the force of resistance of the processed material to the shear of the cutting part 2 of the cutting element, they move relative to the body 1 in the direction opposite to the working stroke, the levers 3 rotate, while the parts 2 close and act on the cut part of the rod in the radial direction proportional to the cutting force. Depending on the technological modes, cutting can be performed simultaneously with. by changing the cut part of the rod or with a differentiated clamp. After separation of the workpiece, body 1 continues to move in the same direction, transferring the workpiece to the stamping position. 1 hp f-ly, 5 ill. i (L

Description

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The invention relates to the processing of metals by pressure, in particular, to a tool for cutting pieces, and can be used for the production and transfer of dimensional blanks in automatic presses.

The purpose of the invention is to improve the quality of the blanks cut by the tool and the productivity by allowing the cut blanks to be transferred to the stamping of the press machine.

FIG. 1 shows a tool for cutting the blanks to the press machines, general view; in fig. 2 - punching position of the press machine; in fig. 3 is a view A of FIG. 2; in fig. 4 - tool for cutting with its backmix; in fig. 5 - the same, when closing parts of the cutting element with the transfer.

The tool for cutting the blanks comprises a housing, parts 2 of the cutting element that are pivotally connected to the levers 3. The levers 3 are pivotally connected to the crackers 4 located in the housing 1 in the direction of rotation. The crackers 4 are held in the housing 1 by adjusting screws 5. In the housing there are screw stops 6 against which the cutting part 2 rests when they are fully closed. Spring-loaded pushers 7 with adjusting screws 8 are also placed in the housing. The return springs 9 are connected at one end with the housing 1, and the other with parts 2 of the cutting element. Position 10 denotes a profiled hole in parts 2 of the cutting element.

The stamp punch 11 is located on the slider 12 of the press machine, the ejector 13 is housed in the chip adapter board 11. The stamp matrix 14 is mounted in the casing 15 of the press machine, and the case 1 of the cutting tool is mounted on the knife rod 16.

The tool works as follows.

In the shaped hole 10 of part 2 of the cutting element serves the bar until it stops (not shown). The tool body 1 connects the working movement (in Fig. 1, the working movement is shown by an arrow), which is transmitted through levers 3 to parts 2 of the cutting element. Parts 2, moving, act on the cut part of the rod and shift it relative to the rest of the rod. Under the action of the force of resistance of the processed material to the shear of the cutting element part 2 relative to the tool body 1 in the direction opposite to the working stroke, the arms 3 pivotally connected to the parts 2 rotate (the direction of rotation is opposite to the working stroke), while the parts 2 are closed and act on the cut part of the rod in the radial (but transverse) direction with a force proportional to the cutting. Depending on the process conditions, cutting can be performed simultaneously with the shaping of the cut part of the bar or differential clamp, the difference is only in the shape of the shaped hole 10 and the size of the original bar, and the principle of operation of the device does not change. As the tool moves and the cutting force grows, the cutting element parts 2 further move and the levers 3 rotate, which causes the parts 2 to close, and as a result, the plastic shape changes in the radial direction of the cut piece (when cutting with the shape cut) or the clip of the cut piece ( when cutting with a differentiated clamp). The angle a is chosen in such a way that at the moment of the occurrence of the maximum cutting force, parts 2 are fully closed, i.e. the force of shaping (clamping) also reaches the maximum value, llocjic section 1b of the workpiece tool body 1 continues to shift billet for stamping position. Parts 2 hold the cut billet, remaining closed under the action of return springs 9. The rotary extractor 13 of the shtampovy punch II pushes the workpiece into the working cavity of the matrix 14 and the tool body 1 is informed by the reverse movement (in Fig. 3 and 4 the reverse movement is shown by an arrow ). When moving in the opposite direction of the part 2, pushing on the ejector 3 of the die-shaped poopsop 11, opens, and the tool freely returns to its original position. After the tool moves back in the direction so much that the ejector 13 leaves the zone of the parts 2, the latter joins under the action of the return springs 9. When the tool returns to the position, the pushers 7 abut against the stops placed on the press-car body 15. mata

0 (not Gukazano), and disconnecting part 2 of the cutting element to the PA magnet, sufficient for the length of free pushing the bar into the working cavity of the knife (practically the size of the gap is in the range of 0.03-0.08d, where d is the diameter of the bar). During operation, the stops located on the body 15 of the press automaton do not act on the pushers 7, therefore the pushers 7 are embedded in the body 1 of the tool under the action of the spring and do not prevent the closure of the parts 2. The adjustable stops 6 are designed to eliminate 1 skew when closing parts 2 of the cutting element (schematically the skew shown pa Fig. 5).

By adjusting the angle a, 5 approaching or expanding the crackers 4 placed in the housing 1 are performed. The approaching of the crackers 4 is carried out by rotating the adjusting screws 5 located in

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Case 1. As the crackers 4 approach, the angle between the axes of the levers 3 and the longitudinal axis of the tool decreases, and as they move apart, they increase.

Claims (2)

1. An assembly of pieces of blanks for automatic press machines, comprising a housing mounted in guides with the possibility of working and returning movement and a cutting element with a shaped hole placed in the housing, characterized in that, in order to improve the quality of the obtained blanks and increase productivity The cutting element is made detachable in a plane that passes through the axis of the hole and is parallel to the direction of movement of the housing; the housing is provided with interacting parts of the cutting element. screw stops and spring-loaded pushers with adjusting screws, and each part of the cutting element is spring-loaded to the body in the direction opposite to the direction of its working movement, and is connected to the body by equal and parallel levers, each of which is connected by means of hinges to the body and the corresponding part of the cutting element. 2. The assembly according to claim 1, characterized in that, in order to improve the performance characteristics by providing the possibility of adjusting the clamping force, the body is made with guides perpendicular to the plane of the connector of the cutting element, and is provided with adjustable movement relative to the body dryers, and the hinge connection of the levers with the body is located on the crackers. 1B ipus.2 F /four 12 In id FIG. 3 fi.5