EP0128486A1 - Lower tool-input of a stamping machine, especially for inserting a die - Google Patents

Abstract

If a lower tool holder (1) of a punching machine, in the receiving recess (2) of which a die (3) is inserted, is only open towards the top, the die must be inserted exactly in the axial direction of the punching tool or in the working direction of the punch. Even with slight tilting, it is not possible to insert the die (3) because a tight fit is provided between it and the receiving recess (2). The insertion of the die (3) is facilitated by providing a transverse stop and a longitudinal guide (23) in the region of the receiving recess (2), both of which can be formed by one and the same surface of a stop element. The latter can be a displaceable and lockable bolt (24) which interacts with a stop counter surface (25) of the die (3) with regard to the stop and also the guided insertion. When inserting the die (3), the cross stop and the longitudinal guide are above the surface of the die or the die holder, while they are located below during punching.

Description

The invention relates to an upwardly open receptacle into which a flat, disk-shaped tool part of an at least two-part tool, in particular a die of a punching machine, is inserted in a lowering manner. In punching machines, but also in nibbling machines, an at least two-part tool is used, which comprises at least one die and a punch. The latter is inserted into an upper tool holder, while the die is inserted into a lower holder. To an exact and To ensure a firm fit of the die in the lower tool holder, a tight fit between the outer contour of the die and the receiving recess is necessary. The outer contour of the natrize is often circular, but the circle can be interrupted by protrusions or notches or the like. The cross-section of the receiving recess is constant from its free upper edge to the bottom, ie there is no provision for an insertion bevel or chamfer in the level. This is mainly due to the fact that nan attaches importance to a closed support surface for the workpiece to be machined, for example a sheet metal plate, on the die and the surrounding area of the receptacle. On the other hand, this makes it difficult to insert the die into the receptacle, because even a slight tilting makes it impossible to lower or insert it in the tight fit.

If one speaks of an "upward open receptacle", it means a receptacle in which the tool part or. the die can only be moved from top to bottom in the working direction of the punch or in the axial direction of the tool. Of course, such a receptacle is also open at the bottom, but this opening is smaller and has nothing to do with the mounting of the natrize, but rather enables the punched part to pass downward. The recording itself is either directly on the machine table or the like. the Punching machine, or on a machine part, in particular a ring-shaped machine part used in this machine table. However, the latter is of minor importance in view of the present invention.

The object of the invention is now seen in designing a punching machine in the area of the lower receptacle for the lower part of an at least two-part tool such that the lower tool part, in particular a die, can be inserted more easily and more quickly.

To achieve this object, it is proposed according to the invention that the punching machine is designed in the region of the upwardly open receptacle according to the preamble of claim 1 and the die in accordance with the characterizing part of this claim. In particular, the die is brought into the flute between the upper and lower receptacle transversely to the working direction of the punch stub, for example, is moved along the upward-facing surface of the receptacle. It is held so that its counter surface hurries ahead and is moved as precisely as possible against the cross stop. As soon as the counter surface of the die has reached the cross stop, the die is located exactly above the receiving recess. If one assumes that this introduction follows up to the cross stop in the direction of the X coordinate of an XY coordinate system, one must of course take appropriate measures to ensure that a Deviation in the X direction is avoided so that this alignment of the die and the receiving recess is also reliably ensured when abutting stops. The natrize is then lowered along the longitudinal guide without tilting, that is to say inserted into the receiving recess, until it comes to rest against the base thereof. The interaction of the transverse stop with the counter-counter surface and the longitudinal guide thus achieves a rapid, cant-free insertion of the die aligned over the receiving recess in the desired manner. So that the tilt-free insertion of the die into the receiving recess is as optimal as possible, the longitudinal guide should protrude so far over the upper edge of the receiving recess that the die is guided from the start, in particular over its entire length (sodium pickle). By means of a suitable measure, care must now be taken to ensure that the upper end of the longitudinal guide, with the die lowered, that is to say completely pushed into the receiving recess, does not protrude beyond the upper ends thereof. This ensures that the workpiece resting on the die, for example a metal sheet, can be displaced in any way within the XY plane without being hindered by the longitudinal guide and, of course, also without being hindered by the transverse stop.

A preferred embodiment of the invention provides that the transverse stop and the longitudinal guide are arranged on a displaceable Elerent, which when the die is struck occupies a raised and, when the die is lowered, a lower displacement position. Before the die is inserted into the receiving recess, the displaceable element is brought into its raised position, so that both the transverse stop and the longitudinal guide assume the position required for the guided insertion. This also means that the longitudinal guide is preferably at least twice as long as the die. In addition, the stop counter surface of the die preferably extends over the entire die height. fold the insertion of the die, you can also slide the sliding element in the same direction down. It is basically without disadvantage if both the die and the displaceable element are lowered together.

In a further development of the invention it is proposed that the stop element is designed as a displaceable and lockable bolt, the partial surface of the jacket assigned to the receiving recess of which forms or receives the transverse stop and the longitudinal guide. In the former case, the bolt preferably has a circular cross-section, but other types of cross-sections can also be used and can be quite advantageous. In the second variant, the transverse stop and the longitudinal guide are, as it were, attached on the inside, as a result of which the cross section of the stop element does not form a complete circular area. In both cases, the transverse stop advantageously also forms the longitudinal guide.

In the case of a tool holder with a transverse stop and longitudinal guide formed by a partial jacket surface, it is proposed in a further embodiment of the invention that the stop counter surface is formed by a longitudinal groove-like recess in the natrize. However, it is not necessary for the longitudinal groove-like recess to be delimited by an arc; other cross-sectional shapes, in particular angular cross-sections, can also be used. In the case of an arcuate cross section of the longitudinal groove-like recess, however, the bolt is of a particularly simple shape and is therefore easy to manufacture. The same also applies to the hole in which the bolt is moved from its working position to a lowered sliding position and vice versa.

Another variant of the invention provides that the bolt can be locked at least in its lower displacement position by means of a locking device. The locking can be carried out, for example, in such a way that the die is at the same time secured against lifting out, for example by friction. For this purpose, the locking device, for example a set screw, can act on the latter along the longitudinal axis of the bolt and thereby press it firmly against the entire surface of the die, which then creates the pressure that can be used for securing at this point.

Another preferred embodiment is by an intermediate the longitudinal guides and the die are connected, in the lowering direction displaceably mounted intermediate member, on which the transverse stop and a driving surface pointing against the direction of insertion are located for the natrize. The die is not lowered directly here, but with the interposition of the intermediate member along the longitudinal guide, that is, inserted into the receiving recess. The striking of the die introduced in the transverse direction takes place at the intermediate link, ie the transverse stop and the longitudinal guide are two separate surfaces in this variant, whereas in the embodiment described above they can be formed by one and the same surface. When the intermediate link is raised, its driving surface is approximately at the level of the upward-facing surface of the receptacle. You can thus move the die along this surface against the cross stop. As soon as the stop counter surface of the die has hit the latter, the die is also on or possibly slightly above the driving surface. However, Fs is more advantageous if the height of the intermediate link is selected so that the die rests on the driving surface when it is slightly above the receiving recess. This means that the pick-up area can also be slightly above the surface of the tool holder.

In a further development of the invention it is proposed that the intermediate member has an essentially bolt-like shape and the longitudinal guide is a bore of the tool holder corresponding to the roller cross section. The hole axis runs parallel to the die axis and thus also parallel to the working direction of the punch. So that the driving surface and the cross stop always assume a correct assignment compared to the tool receiving, it is advantageous if the intermediate link is displaceable but non-rotatably supported. If the tool holder is in a removable machine part, the bearing hole for the intermediate link can also be provided therein.

Another variant of the invention provides that the cross sections of the receiving recess and the Länqsführung overlap and the intermediate member to form the transverse stop and the driving surface has an opening at its upper end, the base of which approximately corresponds to the overlap surface and the height of which approximately corresponds to the die thickness. This recess can be easily made, for example, with the help of a roller-type milling cutter or a disk milling cutter. Something he aufwendi- ^g, however, when the die wears, according to another embodiment of the invention on its outer surface a strip-shaped projection and the recess of the intermediate member comprising the manufacture of a longitudinal groove of corresponding cross section. Nevertheless, this design is very advantageous, because in addition to the cuer stop, this also gives you two side stops, which make it particularly easy to center the die above the receiving recess.

Fine development of the invention provides that the intermediate member can be lowered against the resistance of a return spring. If you hold the inserted die firmly, this also causes the pontic to be held down continuously. Of course, lifting of the inserted die is prevented by holding the inserted intermediate member in a suitable manner. The force of the spring can also be used, at least in a supportive manner, to lift the die out of the receiving recess. Otherwise, the rolling mentioned in claim 3 can be slidably supported against the resistance of a return spring.

The intermediate member can be locked in a very advantageous manner, at least in its lower displacement position, by means of a holding device, which can be, for example, a screw.

• Figur 1 einen Vertikalschnitt durch eine Aufnahme einer Stanzmaschine mit der Matrize in einer für das Absenken geeigneten Zuordnung zur Aufnahmeausnehmung,
• Figur 2 eine der Fig. 1 entsgrechende Darstellung mit eingeschobener Matrize,
• Figur 3 eine Draufsicht auf Fig. 2,
• Figur 4 in einen Vertikalschnitt und etwas kleinerer Parstellung eine zweite Variante der Frfindung mit abgesenkter Matrize,
• Figur 5 eine Draufsicht auf Fig. 4.

The invention is explained in more detail below using two exemplary embodiments. The drawing shows these exemplary embodiments. Here represent:

• FIG. 1 shows a vertical section through a receptacle of a punching machine with the die in an association with the receptacle recess that is suitable for lowering,
• FIG. 2 shows a representation corresponding to FIG. 1 with the die inserted,
• FIG. 3 shows a top view of FIG. 2,
• FIG. 4 shows, in a vertical section and somewhat smaller position, a second variant of the invention with the die lowered,
• FIG. 5 is a top view of FIG. 4.

A tool holder 1 of a punching machine, which can be made in one piece with the machine table of the latter or manufactured separately and inserted into the machine table, has a receiving recess 2 for inserting a die 3, in particular flush, in the direction of the arrow 4. The die is the lower part of at least one two-part punching tool comprising at least one punch. According to FIG. 3, the receiving recess is circular in shape and, according to FIG. 2, its depth corresponds to the height or thickness of the die 3. The receptacle is only open at the top, which is why the die has been aligned exactly in the longitudinal direction of the receiving recess after prior alignment Tool axis 5 must be inserted. Even if the natrize is slightly tilted, it is not possible to push it in because the fit is relatively tight.

In order to be able to quickly align the die with respect to the latter before being inserted into the receiving recess 2, a cuer stop 6 is provided against which a stop counter surface 7 of the die can be brought into contact. Nieraus follows that the die is first brought in the direction of arrow 8 over the receiving recess 2 until the two surfaces mentioned abut each other. Subsequently, a guided lowering takes place with the aid of a longitudinal guide 9. In the exemplary embodiment in FIGS. 1 to 3, the transverse stop and the longitudinal guide 9 are locally separated from one another. This is due to the fact that, in this variant, an intermediate member 10 is connected between the longitudinal guide 9 and the die 3, on which the transverse stop 6 is located, and which is also displaceably mounted in the direction of arrow 4 in the tool holder or at least displaceably in the area thereof . In addition, a nit-taking surface 11 is provided on this intermediate member, which faces counter to the insertion direction 4 and on which the die introduced in the direction of arrow 8 rests before insertion into the receiving recess 2.

The intermediate member 10 has an essentially bolt-shaped shape and accordingly the longitudinal guide 9 is a pipe in the receptacle 1, the cross section of which corresponds to that of the intermediate member. The intermediate link is, however, provided on about half its length with a central blind hole 12, which receives a screw pressure fecer 13, which the intermediate limb in its raised position shown in Fig. 1 holds. After that, the intermediate member is brought via the die 3 against the resistance of the helical compression spring 13 into the displacement end position shown in FIG. 2, in which the die has also reached its final assembly position. This final assembly position of the intermediate link and indirectly via this also of the die can be fixed and secured with Nilfe a holding device 14, in particular a screw.

The die 3 carries on its outer surface a strip-shaped extension 15 which engages in a longitudinal portion 16 of the intermediate member 10. The longitudinal groove is located at the inner end of a recess 17 at the upper end of the intermediate member 10, and it extends in the same direction as the strip-shaped extension 15, in the direction of the slide 4. In this direction, the height of the recess 17 and the longitudinal groove 16 is equal to the height or thickness of the die 3. The cross-sectional shape of the recess 17 corresponds to the overlap of the cross-sections of the receiving recess 2 and the longitudinal guide 9. Each embodiment is a circular cross-section. Through the use of the strip-shaped extension 15 of the natrice 3 and the longitudinal groove 16 of the intermediate member 10 with the same cross-section, not only can the natrize 3 be quickly and securely aligned with respect to the receiving recess 2 in the direction of the X axis 18, but also in the direction of the Y. -Axis 19. The two side flanks 20 and 21 namely form side stops for the Die 3.

In the variant shown in FIGS. 4 and 5, the transverse stop 22 and the longitudinal groove 23 are arranged on a pole 24 that can be displaced in the lowering direction 4, more precisely, formed by its outer jacket. The stop counter surface is designated by 25 and it consists of a longitudinal groove-like recess 26 incorporated into the edge region of the die 3.

The pole 24 is displaceable in a bore 27 of the tool holder 1 in the sense of the double arrow 28. It is a continuous hole, so that the Polzen can be transferred from below by an actuator or in any other way to a raised position. The transverse stop 22 formed by the upper bolt end and the longitudinal guide 23 formed by the same bolt surface are then located above the upper surface 29 of the tool holder 1. The bolt looks at least by an amount corresponding to the thickness or height of the die 3 through its bore 27 out at the top. It can be held in this position by friction. The lowering of the bolt is achieved either by taking it over the die 3 or by moving it separately after the die 3 has been pushed in completely. A holding device 30, again preferably designed as a screw, not only secures the pin 24, but indirectly also the inserted die 3 via it. From Fig. 5 it can be seen that the cross sections of the receiving Overlap recess 2 of die 3 and bore 27. The inner contour of the die can be shaped in any manner, for example, breisrung according to FIG. 3 or square according to FIG. 5.

Claims (11)

1. Upwardly open receptacle, into which a flat, disk-shaped tool part of an at least two-part tool, in particular a die of a punching machine, is inserted in a lowering manner, characterized by an area extending in the direction of the lowering movement (4) of the die (3) (1) arranged cross stop (6, 22) and a longitudinal guide (9, 23) for the die (3), the cross stop cooperating with an overlying stop counter surface (7, 25) of the die (3) and the die along the The longitudinal guide can be lowered into the receiving recess (2), and that the lowered die (3) runs approximately flush with the upper end of the longitudinal guide or slightly projects above it. 2. Tool holder according to claim 1, characterized in that the transverse stop (22) and the longitudinal guide (23) are arranged on a displaceable element (24) which, when the die is struck, assumes a raised and when the die (3) is lowered, a lower displacement position . 3. Tool holder according to claim 2, characterized in that the stop element is designed as a displaceable and lockable bolt (24), the jacket partial surface of the receiving recess (2) forming or receiving the transverse stop (22) and the longitudinal guide (23). 4. Tool holder according to claim 3, with a transverse stop and longitudinal guide formed by a partial surface, characterized in that the stop counter surface (25) is formed by a longitudinal groove-like recess (26) of the die (3). 5. Tool holder according to claim 3 or 4, characterized in that the bolt (24) can be locked at least in its lower displacement position by means of a holding device (30). 6. Tool holder according to claim 1, characterized by an intermediate member (10) connected between the longitudinal guide (9) and the die (3) and displaceable in the lowering direction (4) in the region of the holder (1), on which the transverse stop (6 ) as well as a driving surface (11) for the die (3) which is directed against the direction of insertion (4). 7. Tool holder according to claim 6, characterized in that the intermediate member (10) has a substantially bolt-shaped shape and the longitudinal guide (9) is a hole corresponding to the pole cross-section of the receptacles (1). 8. Tool holder according to claim 7, characterized in that the cross sections of the receiving recess (2) and the longitudinal guide (9) overlap and the intermediate member (10) to form the transverse stop (6) and the driving surface (11) at its upper end Has recess (17) whose base corresponds approximately to the overlap area and whose height approximately corresponds to the die thickness. 9. Tool holder according to claim 8, characterized in that the die (3) carries on its outer surface a strip-shaped projection (15) and the recess (17) of the intermediate member (10) has a longitudinal groove (16) corresponding cross-section. 10. Tool holder according to at least one of claims 6 to 9, characterized in that the intermediate member (10) can be lowered against the resistance of a return spring (13). 11. Tool holder according to at least one of claims 6 to 10, characterized in that the intermediate member (10) can be locked at least in its lower displacement position by means of a holding device (14).

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