CN114126779A

CN114126779A - Ejector unit

Info

Publication number: CN114126779A
Application number: CN202080052817.7A
Authority: CN
Inventors: E·马尔科维奇
Original assignee: Fibro GmbH
Current assignee: Fibro GmbH
Priority date: 2019-11-07
Filing date: 2020-06-22
Publication date: 2022-03-01
Anticipated expiration: 2040-06-22
Also published as: CN114126779B; WO2021089201A1; US20220305545A1; EP3965979A1; KR20220090491A; DE102020116346A1; DE202019106189U1

Abstract

The invention describes a stripper unit comprising a non-circular cylindrical pressure plate, wherein in a cross-section through the pressure plate transversely the non-circular cylindrical outer contour defines its mounting space transversely to the length direction of the cylinder, and a stripper plate is provided which is placed on an end face of the pressure plate and is mounted on a spring element such that it can be moved up and down relative to the pressure plate, wherein the stripper plate is geometrically formed in such a way that it fits completely flush within the cylindrical outer contour of the pressure plate and does not protrude beyond the outer contour.

Description

Ejector unit

The following steps are described:

the invention relates to an ejector having a particularly compact construction.

In the prior art, various embodiments of mechanical strippers for punch-holding plates are known, for example, suitable solutions for standard punch-holding plates according to the automotive standards for ball locks, heavy and light loads and for the working group of shoulder punches (BAK/NAAMS).

The stripper is usually guided precisely in the housing on the shoulder and on the outer diameter throughout the stroke. Some of the solutions have stripper shells with precision drilled and smooth rolling inside to achieve good sliding and support forces.

The housing may be made of stabilized pre-cured steel and provided with corrosion protection. The critical active area can be precisely manipulated so that the optimum angle and alignment is achieved so that a longer service life can be achieved even if exposed to side thrust.

However, it is desirable to reduce the structure and therefore the external dimensions and to optimize the required installation space.

WO 2007018695A3 discloses an extractor unit comprising a precision threaded plug preloading a mechanical die spring which in turn preloads a movable or moving extractor adjacent to a punch tip. The precision threaded plug simultaneously accurately positions the stripper unit on a commercially available ball-lock punch holder. The ejector means is completely self-contained on the face of the ball-lock retainer, thereby minimizing the space required on the pressure plate.

A disadvantage of the embodiments known from the prior art is the fact that the ejector unit protrudes from the punch holder plate, which requires additional installation space and is not an optimal force distribution.

Therefore, an object of the present invention is to provide a stripper in which an installation space is optimized.

This object is achieved by combining the features according to claim 1.

To this end, according to the invention, a non-circular cylindrical pressure plate is proposed, wherein in a cross-section through the pressure plate transversely, the non-circular cylindrical outer contour defines its mounting space transversely to the length direction of the cylinder, and a stripper plate is provided which is placed on an end face of the pressure plate and is mounted on a spring element such that it can be moved up and down relative to the pressure plate, wherein the stripper plate is geometrically formed in such a way that it fits completely flush within the cylindrical outer contour of the pressure plate and does not protrude beyond the outer contour.

In a preferred embodiment of the invention, a punch holder plate is also provided, on which the stripper unit is mounted, and which stripper plate and punch holder plate are geometrically arranged with respect to one another and are formed in such a way that the stripper plate in the mounted state fits completely flush within the cylindrical outer contour of the punch holder plate and does not protrude beyond the outer contour.

Particularly advantageous is a solution in which the stripper plate has the same cross section as the pressure plate and further advantageously the same cross section as the die plate for mounting in a tool.

In a particularly advantageous embodiment of the invention, it is therefore provided that the stripper plate has a cylindrical recess into which the stripper shoe is inserted, wherein the shoe preferably has an open receptacle on one side for, for example, a punch.

It is particularly advantageous if the stripper plate is formed with a stepped end face at the end face, so that the end face is divided by a step into two partial surfaces lying in different planes.

Another preferred embodiment of the present invention provides that the recess for the ejector socket is arranged in the first partial surface, and the second partial surface opposite to the first partial surface protrudes in the length direction of the cylinder.

Another equally preferred embodiment of the invention provides that the top of the stripper socket is located in a common plane with the top of the second partial surface or set back with respect to the plane defined by the second partial surface.

A preferred design provides that the stripper shoe has a top plate formed with a collar, the top plate being formed on the side having a linearly extending side edge surface that abuts a corresponding side edge surface on the stripper plate.

Also advantageous is a configuration in which the corresponding side edge surfaces are formed on the stripper plate by the steps.

More preferably an embodiment in which the stripper plate has a partly circular cross-section in the region of the first partial surface, which in each case converge into a linear course at the end of the partly circular cross-section, and which preferably extends symmetrically in each case with respect to the axis of extension of the cylinder almost up to the step.

In a similarly preferred solution for optimizing the installation space, it is also provided that the stripper plate has a partially circular cross section in the region of the second partial surface and has the same cross section as the pressure plate.

Furthermore, it is advantageous if the stripper shoe has a top plate formed with a collar, the top plate being formed with a partially rounded side edge surface which is flush with or set back relative to the side surface of the stripper plate.

Furthermore, it has proven to be advantageous if the stripper plate has a symmetrical cross section in the region of the second partial surface, which cross section is delimited on one side edge by the step and by two part-circular cross sections which are each interconnected by a linear intermediate region.

It is also advantageous when the printing plate and the stripper plate in the mounted state each have a flush centering opening into which a guide pin is inserted, wherein the guide pin preferably has a thread at its one end face, which thread protrudes from the lower plane of the pressure plate.

Further advantageous developments of the invention are characterized in the dependent claims and are described in more detail below together with the description of preferred embodiments of the invention with reference to the drawings.

Figure 1 shows a plan view of a disadvantageous solution of the prior art;

fig. 2 shows an isometric view of an exemplary embodiment of an ejector unit according to the present invention;

FIG. 3 shows a cross-sectional view through FIG. 2;

FIG. 4 shows a plan view on FIG. 2;

FIG. 5 shows an isometric view of a pressure plate;

figure 6 shows an isometric view of a stripper plate; and

fig. 7 shows an isometric view of the stripper socket.

The invention will be explained in more detail below with reference to fig. 1 to 6, in which like reference numerals indicate like structural and/or functional features.

To better illustrate the disadvantages of the prior art, fig. 1 shows a non-installation space-optimized solution in which the ejector protrudes beyond the pressure plate or punch holder plate.

Fig. 2 shows an isometric view of an exemplary embodiment of an ejector unit 1 according to the present invention, and fig. 3 shows a cross-sectional view and fig. 4 shows a top view thereof.

The ejector unit 1 has a non-circular cylindrical pressure plate 10, as shown in detail in fig. 4. The outer contour is clearly visible in the view of fig. 3, which shows a cross section through the pressure plate 10 transversely to the longitudinal direction of the cylinder to define its installation space.

Furthermore, the stripper unit 1 has a stripper plate 20 which is mounted on an end face of the pressure plate 10 to a defined distance and on a spring element 40, so that the stripper plate 20 can be moved up and down relative to the pressure plate 10.

The stripper plate 20 is geometrically formed in such a way that it fits completely flush within the cylindrical outer contour of the pressure plate 10 and does not protrude beyond the outer contour, as shown in the example of fig. 1. Such a flush profile is achieved because the spring elements 40 (such as, for example, compression springs or elastomeric springs) are not arranged within the socket profile of the stripper socket 30. This separation provides the advantage that the stripper shoe 30 is also located completely within the outline of the stripper plate 20 and stripper unit 1.

Also not shown is a punch holder plate, on which the stripper unit 1 is or can be mounted, and the stripper plate 20 and the punch holder plate are geometrically arranged with respect to one another and are formed in such a way that the stripper plate 20 in the mounted state fits completely flush within the cylindrical outer contour of the punch holder plate and does not protrude beyond the outer contour.

As already explained, for this purpose, spring elements (e.g. compression springs 40) are arranged in the stripper plate 20 adjacent to the stripper sockets 30 and are thus separated from them.

The stripper plate 20 has a cylindrical recess into which a stripper socket 30 (shown in detail in figure 6) is inserted. The stripper shoe 30 has an annular circumferential groove 35 in which a retaining ring 37 engages in order to secure the stripper shoe 30 at the stripper plate 20.

At the end face directed upwards in the figure, the stripper plate 20 has a stepped end face 21, wherein the end face 21 is divided by the step 21 into two

partial surfaces

21a, 21b which are thus in different planes. Said recess 25 for the extractor socket 30 is expediently arranged in the first partial surface 21a in a manner optimized for the installation space. In the mounted state, the top of the stripper socket 30 forms a common plane or surface plane with the top of the second partial surface 21 b.

As can also be seen from fig. 2 and 3, the stripper socket 30 has a top plate 32 formed with a collar 31, which top plate 32 is formed on the side with a linearly extending side edge surface 34 which bears in a form-fitting manner against a corresponding side edge surface at the stripper plate 20 (the side pointing to the right in the plane of the drawing). The corresponding side edge surface on the stripper plate 20 is realized by a step 21.

In summary, the ejector unit 1 has an optimized shape and thus an optimized installation space. For this purpose, the stripper plate 20 has, in the region of the first partial surface 21a, a partially circular cross section (section TQ) which merges at the end of the partially circular cross section into a linear course (LV), and which preferably extends in each case symmetrically with respect to the axis of extension of the cylinder almost up to the step 21.

The stripper shoe 30 has a top plate 32 formed with a collar 31, the top plate 32 (in addition to the side edge contact surface 34 described above) being formed with a partially rounded side edge surface that is flush with the side surface TQ of the stripper plate 20.

In the region of the second partial surface 21a, the stripper plate 20 has a symmetrical cross section which is delimited on one side edge by the step 21 and by two part-circular sections 26, which are interconnected by a linear intermediate region 27 which is clearly visible in the view of fig. 4.

Next, it can be seen from the figures that the pressure plate 10 and the stripper plate 20 in the mounted state each have a flush centering opening 19, 29, into which a guide pin 50 is inserted, wherein the guide pin has a thread at its one end face, which thread protrudes from the lower plane of the pressure plate 10.

The practice of the invention is not limited to the preferred exemplary embodiments specified above. On the contrary, even in the case of fundamentally different embodiments, a plurality of variants using the solution shown are conceivable.

Claims

1. A stripper unit (1) comprising a non-circular cylindrical pressure plate (10), wherein in a cross-section through the pressure plate (10) transversely, the non-circular cylindrical outer contour defines its mounting space transversely to the length direction of the cylinder, and a stripper plate (20) is provided which is placed on an end face of the pressure plate (10) and is mounted on a spring element (40) such that it can be moved up and down relative to the pressure plate (10), wherein the stripper plate (20) is geometrically formed in such a way that it fits completely flush within the cylindrical outer contour of the pressure plate (10) and does not protrude beyond the outer contour.

2. The stripper unit (1) according to claim 1, characterised in that a punch holder plate is also provided, on which the stripper unit (1) is mounted, and that the stripper plate (20) and the punch holder plate are geometrically arranged with respect to one another and are formed in such a way that the stripper plate (20) in the mounted state fits completely flush within the cylindrical outer contour of the punch holder plate and does not protrude beyond the outer contour.

3. The stripper unit (1) according to claim 1 or 2, characterised in that the stripper plate (20) has the same cross section as the pressure plate (10).

4. The stripper unit (1) according to any of the preceding claims, characterised in that the stripper plate (20) has a cylindrical recess (a) into which the stripper socket (30) is inserted.

5. The stripper unit (1) according to claim 4, characterised in that the stripper plate (20) forms a stepped end surface (21) at the end surface, dividing the end surface (21) by the step (21) into two partial surfaces (21a, 21b) lying in different planes.

6. A stripper unit (1) according to claim 4 or 5, characterised in that the recess (A) is arranged in the first partial surface (21a), the second partial surface (21b) opposite the first partial surface (21a) projecting in the length direction of the cylinder.

7. The stripper unit (1) according to claim 6, characterised in that the top of the stripper socket (30) is located in a common plane together with the top of the second partial surface (21b) or is set back with respect to the plane defined by the second partial surface (21 b).

8. The stripper unit (1) according to any of claims 4-7, characterised in that the stripper socket (30) has a top plate (32) formed with a collar (31), which top plate (32) is formed on one side with a linearly extending side edge surface (34) abutting against a corresponding side edge surface on the stripper plate (20).

9. The stripper unit (1) according to claim 8, characterised in that the corresponding side edge surface is formed on the stripper plate (20) by the step (21).

10. The stripper unit (1) according to any of the preceding claims, characterised in that the stripper plate (20) has a partly circular cross-section in the region of the first partial surface (21a), which cross-section converges into a linear course at the end of the partly circular cross-section, and which linear course preferably extends in each case symmetrically with respect to the extension axis of the cylinder almost as far as the step (21).

11. The stripper unit (1) according to any of the preceding claims, characterised in that the stripper plate (20) has a partly circular cross-section in the area of the second partial surface (21a), with the same cross-section as the pressure plate (10).

12. The stripper unit (1) according to any of claims 4-11, characterised in that the stripper socket (30) has a top plate (32) formed with a collar (31), the top plate (32) being formed with a partially rounded side edge surface (34), the partially rounded side edge surface (34) being flush with or set back relative to a side surface of the stripper plate (20).

13. The stripper unit (1) according to any of claims 5-12, characterised in that the stripper plate (20) has a symmetrical cross-section in the region of the second partial surface (21a), which cross-section is delimited on one side edge by the step (21) and by two part-circular cross-sections (26) interconnected by a linear intermediate region (27).

14. The stripper unit (1) according to any of the preceding claims, characterised in that the pressure plate (10) and the stripper plate (20) in the mounted state each have a flush centring opening (19, 29), into which flush centring openings (19, 29) guide pins (50) are inserted, wherein the guide pins (50) preferably have a thread at one end face thereof, which thread protrudes from the lower plane of the pressure plate (10).