DE2127495A1 - Shear press with opposite shear jaws - Google Patents

Description

BUZUEI MOTOH OQMPAIiY LIMITED, Kainimura - Japan SGherpresse with opposite shear jaws

The invention relates to a shearing pressure for shearing workpieces, with fine and smooth shear surfaces being obtained. In particular, the invention relates to a press with opposing cup jaws, one of which is provided with a protrusion with a flat outer bit and the other is usually arranged at a reasonable distance from the first jaw, the workpiece being sheared on such is that it is subjected to a Druckaeformation while it is held between the opposed jaws and is then cut by a refractive temple for terminating the shearing process or aborted ₀

The commonly used shearing causes the edges to be compressed (or lowered) more or less, breakage or burr formation on the sheared surface, with the conditions on the resulting edges of the product are not absolutely desirable.

Recently, fine-shear methods for obtaining smooth and beautiful sheared edges on panels have been developed that are free from crowding of the edges, burrs and other defects. Metal working machines to carry out these processes commercially

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Also developed, some of these machines are the fine punching press of the Schmidt Go ₀ and the cutting press of the Bssa Co. These two fall under the category of scuffing that is suitable for fine shearing. However, they contain greater difficulties with regard to the relatively low hardness of the shear materials and cannot appropriately regulate deburring of the workpiece during shearing. This is limited to the use of shearing pieces where the cutting depth or cutting length is very small.

k The press according to the invention overcomes these difficulties the previous shearing process and can cut panels without breaking the shear edges, but fine and smooth burr-free surfaces result.

This press is operated with higher hydrostatic pressure exerted in the whole area of the work piece that is to be subjected to plastic deformation, especially in the height of the tool edges, and by shearing with the cutting mechanism: performed.

The invention is explained with the aid of the drawings. In these Figures 1 to 4 consecutive ψ views of essential parts of the press with opposed jaws for shearing a workpiece according to the invention:

Figure 1 shows a main piston, the lower jaw, which is in contact with the workpiece, and a floating jaw support;

Figure 2 shows the tool edge of the lower jaw, which in cuts into the workpiece;

Figure 3 shows that deformed according to the pressure of the plate

Workpiece, with the jaw being incised

Has a head start; and

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Figure 4 shows a break-off stamp, the down on a point comes at which the sheared workpiece is broken off; and the

Figures 5 to 8 are sequential representations of the design and operation of the press with opposing jaws according to the invention.

Figure 5 shows the main piston, which is connected to the lower Jaw of lying workpiece is lifted ·;

Figure 6 shows that brought into contact with the upper jaw with a protrusion at its lower end Workpiece;

Figure 7 shows this further, mainly through the tool edge the lower jaw, incised workpiece; and

FIG. 8 shows the finished product ejected by the lowering of the break-off punch.

Figures 1 to 4 successively show the cupping process according to the invention.

In Figure 1, the lower jaw a is shown with a workpiece b, which is provided for machining and together with a main piston, not shown, with an upper jaw d with a gate jump, c with a flat seat is provided at its lower end, is brought into contact. There are also a stripping punch e and an ejector f is provided, which is correspondingly carried out by a snap-off piston (not shown) and an ejector piston be operated.

FIG. 2 shows that the plastic deformation in the workpiece under a pressure exerted by the main piston and the jaw a with respect to the Workpiece b is raised slightly. In this case

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is a shear deformation plane g on the line that the \ 7 tool edge of the jaw a with the 7 / tool outer edge of the 3acke d connects to the projection, and the workpiece is cut solely on the tool edge side the jaw a through the cutting mechanism ".

FIG. 3 shows the next stage shown in FIG. The distance between the upper surface of the jaw a and the lower end surface of the jaw d with the protrusion is now less than the width of the flat part h or the upper annular spot of the protrusion c. The plastic deformation of the workpiece is generally in conformity with a mechanism similar to the mechanism of pressing the flat plates _o At this point, jaw d with the protrusion as well as jaw a has already started to cut into workpiece h «

In the stage following the compression deformation of such a flat plate, the resistance of the material to plastic deformation increases so rapidly that any separation by the shear force of the piece becomes impossible. When the break-off punch e is lowered in the previous working stage, the product is easily separated is again driven down by a break-off piston (not shown) that follows the end of the plate pressure «

In the press according to the invention, shearing takes place in four stages of work. When one cycle follows one another, the ejector f is raised, the Break-off punch e pressed and lifted after punch e has gone up «At the same time, the lower

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The cheek is lowered and the pieces and waste become taken out. Then a new workpiece is placed on the top surface of the lower jaw and the process repeated"

The press with opposite jaws according to the invention thus causes shearing when passing through four levels, these are:

1. Dps placing a workpiece on the lower jaw and Hold this under a certain pressure between the two jaws;

2. the plastic deformation of the workpiece by a cutting mechanism;

3. the plastic deformation at the base of the mechanism with flat pressure plate; and

4. Breaking out the finished product.

Thus, the press according to the invention has a structure and a mode of operation that completely and correctly carries out the four listed process steps.

Better about the press with opposite jaws according to the invention to be able to show, it is with a hydraulically operated main piston in a pressure cylinder Shown next to the press table, with a main jaw carrier carrying the lower jaw and attached to this piston is, a hydraulically operated ejector is arranged coaxially in the main piston, a floating jaw carrier, similar to a piston that carries a jaw with a protrusion opposite the lower jaw and vertical and can be moved axially over this Sbrecke, at the bottom iinde the upper part of the press is attached and a hydraulically operated break-off ram is coaxially attached to the press floating jaw carrier is located.

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Figures 5 to 8 are sectional views of essential parts of a press according to the invention in different Work stages. The press table 2 forms the lower limit of the working space in the press housing 1 and contains a master cylinder 4 and a master piston 5 in the cylinder 4 can slide vertically «The main jaw carrier 6 is held by the main piston and is located on it the lower jaw 7 · The main piston. 5 carries coaxially an ejector 8. in the axis of the main piston there is a passage 11 through which hydraulic oil flows to against the bottom surface of the ejector 8 to act »For the hydraulic oil that presses against the bottom surface of the main piston 5, there is an inlet 9 intended. Another inlet 10 for the hydraulic oil applies hydraulic pressure to the space via a flange 12 of the main piston 5 · To limit the waiting movement of the main piston 5, a stop is provided on the piston.

The upper part of the press 3, which determines the upper limit of the working space of the press, carries a floating one coaxially Jaw carrier 14, which can be moved up and down a short distance similar to a piston, which is located opposite the main jaw carrier 6. Located between the carrier 14 and the upper part 3 of the press a pressure chamber 18 through which the upper surface of the floating beam 14 is kept under hydraulic pressure can be. The upper jaw, which is provided with a protrusion, extends from its underside opposite the lower jaw Jaw 7 · Coaxially to the floating support 14 and the upper jaw 15, a break-off punch 16 is inserted which be moved up and down by a piston 15 can. The ports 2o and 21 let hydraulic oil either flow into the upper or lower space around the piston 17. Another opening 19 supplies hydraulic oil in the pressure chamber 18 of the floating carrier 14,

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The path of the break-off piston 17 is through a stop 22 limited.

Figure 5 shows to explain the operation of the press according to the invention, a workpiece on the lower Jaw 7 rests on it, i.e. the product obtained through the press cycle is passed through together with the waste the ejector, which is lifted by the hydraulic oil supplied via the passage 11, is pushed out and that The next workpiece to be treated is placed on the lower jaw.

The hydraulic oil flows through openings 9 and 19 in the cylinder 4 or «, in the pressure chamber 18 and places on the main piston 5 and the floating carrier 14 a upward or downward pressure, whereby the main piston 5 is raised and the carrier 14 on the reaches the bottom of its path.

The main piston 5 is together with the workpiece 23, such as Figure 6 shows raised so that the front piece 23 comes into contact with the upper jaw 15 with the projection and the floating support 14- is raised in spite of its compressive force until the floating unit touches and opens in this way the workpiece 23 is kept under pressure between the two jaws. This state corresponds to of Figure 1, which shows the operation of the press according to the invention.

If the hydraulic oil is supplied further as described, a plastic deformation takes place on the workpiece, which is located between the vertically opposite jaws 7 and 15, as FIG. 7 shows. First, a shear deformation plane on the physical line is created corresponding to the Figure 2, the tool edge of the lower jaw 7 r ä ^e outer edge of the tool

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Jaw 15 connects to the projection. According to the cutting mechanism, the cutting is made from the tool edge of the lower jaw 7. Further, as the distance between the two jaws 7 and 15 decreases to a value smaller than the width of the upper annular part of the protrusion, plastic deformation occurs at the base of the flat pressure plate mechanism At this value, the stop 15 screwed to the main piston 5 is brought into contact with the press table 2 so that the main piston W cannot rise any further. During the plastic deformation, the ejector 8 lowers relative to the main piston while it keeps the workpiece 23 under constant pressure.

FIG. 8 shows a product which is separated into the lower jaw 7 by the downward movement of the break-off punch 16 while the described state continues. When the workpiece has been compressed by a mechanism practically corresponding to the mechanism of pressure of the flat plate to a value shown in Figure 3 , hydraulic oil is supplied through the opening 2o, so that the product 24- from the remainder of the workpiece through the * break-off punch 16 is separated out under the action of the snap-off piston 17. Figure 4- shows this state. The downward travel of the break-off punch 16 is not limited by the stop 22.

The press according to the invention delivers stamped parts through the working steps explained. The hydraulic oil will given through the openings 9 and 2o, while hydraulic oil also flows through the openings 1o and 21. Through this the main cylinder 5 is lowered and at the same time the break-off punch 16 moves away from the product 24- up. 7 / meanwhile the ejector 8 goes up

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■ and presses the product 24- out of the lower jaw 7, that can be taken out of the press, thus completing the work cycle.

As already explained, the press with opposing jaws according to the invention holds the workpiece between the two jaws under pressure, causes the plastic deformation on the workpiece on the basis of the cutting mechanism and the printing mechanism and finally cuts the product with the break-off die to an object the desired shape to be obtained. For this purpose, a jaw carrier is necessary in the upper part of the press is freely movable in the axial direction over its entire path. In the illustrated embodiment, the jaw carrier can be applied to the pressure chamber by applying hydraulic oil be moved over two millimeters up or down, creating a compressive force. Instead of hydraulic oil, an annular leaf spring or the like. In the pressure chamber can be used to the same Effect "au achieve.

If possible, cut enough through the top and bottom jaws to get the length The hydraulically operated workpiece can also be used to shorten the workpiece to be cut off by the break-off punch Snap-off piston, as it is used in the described embodiment, by a spring with the necessary Extensibility or replaced by an elastic material such as rubber.

The arrangement according to the illustrated embodiment can also be modified so that the with the projection provided jaw assigned to the main jaw carrier and the other jaw is attached to the floating Baokträger. It is also possible to break the ejector 8

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chen and the break-off punch 16 the finished to be pushed out.

Since the use of a shear press after the invention it reduces crowding and enables fine shearing without breakage and burr formation significant improvement in fine pressing.

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Claims (2)

Berlin 33 (Grunewald) £ I £ / ^ 3 Q HertJertstr. 22, Tet8BZ723t 46-1oo3 SUZUKI MOTOR GQLIPAITY LILlITiüD, Kamimura - Japan Claims Shear press with opposite jaws and a press table, as the lower limit of the working area of the Shear action, a pressure cylinder in this table, a hydraulically operated main piston in this cylinder, a main jaw carrier in connection with a lower jaw on the piston, a hydraulically operated ejector coaxial to the center of the main piston, a press upper part for determining the upper working space, characterized in that, that a floating jaw carrier (14) presses against the main jaw carrier (6) against this and over can swim a short distance under hydraulic pressure that an upper jaw provided with a protrusion (15) With a flat part at its lower edge at the Underside of the floating jaw carrier (14) opposite the lower jaw (7) is attached, and that a hydraulic actuated break-off ram (16) coaxial with the floating one Jaw carrier (14) and is arranged to run through its center. 2. Shear press according to claim 1, characterized in that the floating jaw carrier (14) in the upper part of the press (3) is fitted over elastic material and over a short distance with respect to the. Main jaw carrier (6) one can be moved up and down a short distance 3 shear press according to claim 1, characterized by Afceneieichnet, that the break-off stamp (16) via elastiaopeeelaterial in the The upper part of the press is fitted and thru the table Material can be operated. Ki Tuesday 109850/1346 OWGiNAt INSPECT5D Blank page