DD158749A1 - LOWER HOLDERS AND EQUIPMENT FOR FORMING AND CUTTING TOOLS - Google Patents

Abstract

The aim of the invention is to eliminate the high expenditure of time when changing tools and in particular the weakening of the lower tools and press tables. OBJECT OF THE INVENTION: Changing the arrangement of the spring elements in conjunction with the design of the components used to support the spring elements. According to the invention, this object is achieved by arranging in a tool base plate in a lower recess a disc nut with a sliding ring and in an upper recess of the Aushebering, between compression springs and attached to the slide ring pins provided and both a lower same level and an upper same level respectively at the Tool base plate are formed.

Description

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Title of the invention

Hold-down and ejector device for contouring and cutting tools

Field of application of the invention

The invention relates to a hold-down and ejector for holding down a sheet metal part during the forming process and for ejecting a finished sheet metal part from the lower tool insert, consisting of ejector ring. Compression springs and for supporting the compression springs components,

Characteristic of the known technical solutions

After Romanowski, WPs "Handbook of punching technology", 5th edition, VEB Verlag Technik, 1965, pp. 409 to 413, in particular pictures 409 to 411 and after Oehler / Kaiser: "cutting, punching and bending tools", 5th edition Springer-Verlag Berlin / Heidelberg / New York, 1966, pp. 195 to 196, in particular image 201, tool-bound hold-down and ejection devices in the form of spring-pressure apparatuses and die cushions serving the same purpose are known.

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Spring pressure devices consist essentially of a Aushebering, one or more successively arranged spring elements, a Abstützteller and a threaded bolt with lock nuts. Spring pressure devices are attached to the base plate of the tool or tools and protrude into corresponding openings of the press table. According to the above-mentioned manual Romanowski (Fig. 408b), also short-stroke cutting tools with die cushion are known, which have a flat pressure chamber with diaphragm and operate on a pneumatic basis. "The disadvantages of these solutions are time consuming for disassembly and assembly of hold-down and ejector devices or after the factory. tool change, large required breakthroughs in the press table, difficult accessibility to the located in the table breakthrough Niederhalter- and ejector devices and risk of accidents and the necessary for each tool change readjustment of Niederhalter- or Auswerferkraft. The disadvantages of working with membrane tools are the low possible stroke, low stability of the lower tools by large cavities and insufficient due to their inertness pneumatic pressure medium for very fast-running operations.

Because of these disadvantages, the known hold-down and Auswerfersinrichtungen, especially with multiple arrangement of forming and cutting tools in the form of total composite tools on presses for Emballagenherstellung not or only with low effectiveness used.

Object of the invention

The objectives of the invention are to eliminate the mentioned disadvantages of the high time spent on tool change, the risk of accidents and the weakening of the lower tools and press tables.

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Explanation of the essence of the invention

The invention has for its object to change in a device of the type described above, the arrangement of the spring elements in connection with the formation of serving to support the spring elements components.

According to the invention the object is achieved in that in a lower recess of the tool base plate a disc nut with sliding ring and in an upper recess of the tool base plate a Aushebering are arranged, and large and small holes in the tool base plate between slide ring and Aushebering are formed by the compression springs and on Slide ring fixed pins are inserted, which protrude into the release ring »The lower surfaces of the movement ·? tool base plate and a threaded insert on the one hand form a lower same level and the upper surfaces of the tool base plate, an insert and the Ausheberbestellung Ausheberinges form on the other hand, an upper same level, the Aushebering abuts with his collar on the insert ·

A feature of the solution according to the invention is that the disk nut on the housing side contains a number of Verstellnuten whose pitch angle are smaller than a tunnel-shaped recess in the tool base plate ·

The solution according to the invention is also configured in that the tool base plate relative to the Verstellnuten the disc nut has a recess with inserted spring and directed at the Verstellnuten locking slide.

Another feature of the solution according to the invention is located in the tool base plate below the mounting plate of the lower tool insert and in use compressed air channel, from an inner compressed air bore to the side

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extends outside the mounting plate of the lower tool insert and which is closed by the Ausheberbestellung designed as a sealing element Aushebering. A final feature of the solution according to the invention is that the tool base plate is at the same time the base plate of a guide frame.

The device of the invention has the consequence that during downwards movement of the press ram a defined hold-down force on the reshaped sheet metal part acts and wrinkles is avoided and that the return of the press ram the ejector ring back to its original position and thus ejector pins an ejector also in its initial position is returned, wherein the deformed sheet metal part is ejected from the lower tool insert. This starting position of the ejector, Auswerferstiften and Auswerferring corresponds to the Auswerferstellung the described device · Particular advantages are that »serving for spring support plate formed as a sliding ring and the voltage applied to it disc nut in the axial direction of the springs is adjustable. As a result, the spring force can be adjusted depending on the required Niederhalter- and Auswerferkraft and secure the disc nut in conjunction with a slide against self-adjustment depending on the tool base plate inserted lower tool insert · The springs including slide ring, disc nut and Aushebering are housed within the tool base plate that a sufficiently large stroke of the lifting and Auswerferringes is possible »The lower tool inserts have no large-scale cavities · Finally, the press table by the inventive solution on a closed flat surface

Another advantage of the invention is that the self-contained in the starting position Aushebering seals a compressed air channel so that the tool base plate supplied externally processed compressed air

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Escapes through the compressed air holes in the active part, while the active parts cleans, lubricates and cools and contributes to the easier ejection of the formed sheet metal part. Whereas in the area of the lower plunger position, by the pressed down Aushebering, the supplied compressed air and between the sheet metal part and the active parts of the lower mold insert during the forming forming compressed air, through the now released compressed air channel, can escape into the Fres

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embodiment

The invention will be explained below using an exemplary embodiment.

In the accompanying drawings:

Fig. 1: Section of the tool base plate with lower tool insert a Emballagen lid tool in Auswerfstellung

Fig _e 2: top view of FIG. 1

Fig. 3 i disc nut fuse in partial view from below

The tool base plate 1 according to FIG. 1 has in the lower recess 31 a threaded insert 8 with a screwed-on disc nut 3, in which a sliding ring 13 with three riveted pins 14 is arranged. The pins 14 are axially displaced slightly in small holes 15 of the tool base plate 1 and in holes 16 of the Ausheberinges 2. The release ring 2 is disposed in the upper recess 30 of the tool base plate to the insert 7 and axially displaceable. Oe six compression springs 4 protrude through large holes 32 of the tool base plate 1 and are uniformly arranged in existing on the circumference of the Ausheberinges sinkings 17 and 18 in the lowering of the sliding ring. According to FIG. 2, the disc nut 3 on the shell side has at equal intervals adjustment grooves 10 whose pitch angles 11 are smaller than the tunnel-shaped recesses

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in the tool base plate 1, by which an adjustment of the disc nut 3 and thus the hold-down or "ejection force of the device described in the mounted state in the press is possible. The lower surfaces of the threaded insert and the tool base plate 1 form a lower, like plane 9 in FIG. 1. The upper surfaces of the tool base plate 1, the insert 7, and the ejector ring 2 in the raised position form an upper, same plane 28. FIG the tool base plate 1 is mounted a recess in which a locking slide 22 and a spring 23 are located. During downward movement of the press ram the ejector ring 19 is effective as a hold-down to prevent wrinkling during the forming of the Emlagagen cover 20. The required holding-down force is adjusted by turning the disc nut 3. The engaging in the Verstellnuten locking slide 22 is used in conjunction with spring 23 as a safeguard against automatic adjustment of the disc nut 3. Under the action of the forming the deformation of the Emballagen lid 20j robij this takes place at the end of the forming of the active part contour of the lower tool insert. 6 applies, and it compresses the air located at the beginning of the deformation between Emballagen cover 20 and the active part contour of the lower tool insert 6 and presses through the released from the ejector ring 2 compressed air channel 24 into the open »During the return of the press ram sets by the action of the compression springs 4th the self-contained Aushebering 2 to the underside of the mounting plate 33 and thus seals the compressed air channel 24 from «At the same time the Aushebering 2 is located with its collar 27 on the insert 7 at. Characterized the supplied from the outside of the compressed air supply 26 of the tool base plate 1 compressed air is passed into the lower tool bit 6 and through internal compressed air holes 25 so that the compressed air for cleaning, lubricating and cooling of the lower tool bit 6 and easier ejection of the Emlagagen lid 20 is effective ,

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The ejector ring 2 engaging in the return of the press ram to the underside of the mounting plate 33 of the lower tool insert 6 also presses on the ejector pins 5, which in turn bring the ejector ring 19 into the initial position and thus eject the lid 20 from the lower tool insert 6.

Claims (5)

- * - 2zy b ί ι υ claim to invention 1 »Holding-down and ejecting device for forming and cutting tools, consisting of ejector ring, compression springs and components for supporting the compression springs, characterized by. a) in a lower recess (31) of a tool base plate (1) arranged disc nut (3) with a sliding ring (13), b) a release ring (2) arranged in an upper recess (30) of the tool base plate (1), c) formed large holes (32) and small holes (15 in the tool base plate (1) between slide ring (13) and Aushebering (2) through which compression springs (4) and the slide ring (13) fixed pins (14) are passed, which protrude into the ejector ring (2), d) a lower equal plane (9), which is formed by the lower surfaces of the tool base plate (1) and a threaded insert (8), and e) an upper equal plane (28) formed of the upper surfaces of the tool base plate (1), an insert (7) and the Ausheberbestellung Ausheberinges (2), with its collar (27) on the insert (7 ) is present. 2. Device according to item 1, characterized in that the disc nut (3) contains a number of adjusting grooves (10) whose pitch angles (11) are smaller than a tunnel - shaped recess (12) in the tool base plate (1). 3. Device according to item 1 and 2, characterized »that the tool base plate (1) relative to the shell side of the disc nut (3) formed Verstellnuten (10) has a recess (21) with inserted spring (23) and one on the Verstellnuten (10 ) directed locking slide (22) has. Λ. 229511 4. Device according to item 1, characterized in that in the tool base plate (1) below the inserted mounting plate (33) of the lower tool insert (6) and in the insert (7) is a compressed air channel (24) of an inner compressed air bore ( 25) extends laterally outside the mounting plate (33) of the lower tool insert (6) and is closed by the lifting position (2) formed in the lifting position as a sealing element. 5. Device according to item 1, characterized in that the tool base plate (1) is also the base plate of a guide frame. For this .... JL.Seiten drawings