EP0086459B1 - Rotary swaging machine - Google Patents

Abstract

This invention relates to a swaging machine comprising depth-setting wedges for the use of the machine for recess swaging. These wedges are disposed between each die and the ram for actuating the die and are displaceable parallel to the axis of the machine by means of depth-setting flange, on which said wedges are detachably mounted. The wedges are adapted to be axially inserted into the depth-setting flange so that the large end portion of each wedge is held on said flange, and spring-loaded detent pins are preferably mounted on said flange and adapted to retain said large end portions of said wedges by snapping into detent recesses provided on said large end portions on opposite sides thereof.

Description

The invention relates to a rotary hammer machine with jaw wedges for plunge hammering according to the preamble of claim 1, US-A-2433152 being used as the closest prior art.

Rotary hammers are known which, by means of radially guided hammering tools, serve to reduce the cross-section through oscillating hammering movements in the case of rod-shaped or tubular material. The material is reduced in cross-section with feed.

Furthermore, it is known for the so-called. Puncturing the oscillating hammer movement to superimpose a radial infeed movement on the hammering tools. This is done by means of wedges, which are inserted between the hammer plunger and hammer jaws in an axis-parallel direction. These wedges are displaced by means of a displaceable adjusting flange, on which they are movably suspended in order to be able to accommodate the oscillating hammer movement and, if appropriate, also the infeed movement of the hammer tools.

When changing the hammer machine to other workpieces, not only are the hammer jaws to be replaced, which can be easily removed, but in many cases the wedges for cleaning the hammer mechanism or for wedges with a different pitch are also to be replaced, which has been difficult up to now. For wedges suspended in the adjustable flange, the hammer tappets must also be removed to change them. In addition, the known designs require a larger space in the radial direction due to the clearance required for installing and removing the wedges.

The object of the invention is above all to provide an easily replaceable and space-saving wedge arrangement for rotary hammers with jaw wedges for plunge hammering. Finally, by simply removing the wedges and exchanging the hammer jaws with wedge surfaces for those without wedge surfaces, conversion to a normal hammer machine without wedge feed should also be possible.

This object is achieved according to the invention in rotary hammers according to the preamble of claim 1 by the characterizing features of claim 1.

For this purpose, the wedges on their end shoulders preferably have upright grooves on both sides, into which the spring bolts lying in its plane fall through clearance when the axles are inserted into recesses on the adjustment flange.

• Fig. 1 die Frontansicht eines Hämmerwerks,
• Fig. 2 einen Ouerschnitt vor dem Verstellflansch, teilweise aufgeschnitten,
• Fig. 3 eine Seitenansicht der Keile mit Verrastung am Verstellflansch und
• Fig. 4 eine andere Ausbildung der Verrastung nach Fig. 3.

Further details of the rotary hammer machine with jaw locking wedges according to the invention are shown in the drawing using preferred exemplary embodiments and show:

• 1 is a front view of a hammer mill,
• 2 an cross section in front of the adjustment flange, partially cut open,
• Fig. 3 is a side view of the wedges with locking on the adjustment flange and
• 4 shows another design of the latching according to FIG. 3.

As can be seen from the drawing, the hammer mechanism consists of the hammer shaft 1 with hammer plunger 2 and hammer jaws 3, which (3) form the hammer opening 4 for the workpiece 5. The jaw locking wedges 6 can then be displaced axially parallel between the hammer jaws 3 and the plungers 2. This is followed by the pressure rollers 7 in the cage 8, which (7) act on the heads 9 of the hammer jaws 2 when the shaft 1 rotates and which (7) run in the outer ring 10. In other embodiments, the outer ring 10 can rotate instead of the shaft 1 or both (1 and 10) rotate in the same direction at different speeds or in opposite directions to one another. This different rotation creates the oscillating hammer movement of the hammer plunger 2 with hammer jaws 3, which, in the case of existing jaw locking wedges 6, can be superimposed on a radial feed movement. Finally, two, three and four jaw arrangements are known.

To remove or replace, the jaw locking wedges 6 can be inserted with their shoulders on the adjusting flange 12 in the axial direction into recesses 13, for which purpose spring bolts 14 are arranged in the adjusting flange, which engage in locking recesses 15 on the side of the wedge shoulders 11. The latching depressions 15 are formed by grooves running on both sides on the wedge shoulders, into which the spring bolts 14 fall by play to limit the travel. As a result, a certain mobility of the wedge locking is achieved, as is necessary for the hammer movement which the wedges 6 join between the plungers 2 and jaws 3.

According to FIG. 2, the spring bolts 14 are guided on both sides of the recesses 13, which lie radially in the adjustment flange 12, for receiving the wedge shoulders 11 in a way that limits them. These spring bolts 14 can, as shown in FIG. 3, be hemispherical on the head 14a and, moreover, be designed as a square with a corresponding round groove 15a as a recess in the wedge shoulder 11. These spring bolts 14 can be on the head 14b, as in FIG. 4, but also be of an angular design, the insertion side to the wedge shoulder 11 preferably being flatter than the pull-out side and which then engage in an angular groove 15b as a locking recess on the wedge shoulder 11. The travel of the spring bolts 14 can be achieved by means of an elongated hole pin guide 16 or by means of an abutment shoulder, which is not shown.

Finally, a leg spring 17 is arranged on each side of the spring bolt 14 for insertion into the side grooves 15, whereby in the case of a three- and four-jaw arrangement, each leg spring 17 with each leg 17a, 17b can engage in a spring bolt 14 of adjacent wedge shoulders 11, so that Fig. 2 to allow a space-saving arrangement. The receiving plate 18 for the spring bolt 14 with springs 17 is in 3, screwed to the adjustment flange 12 and the wedges 6 have holes 19 on their tongue side opposite the wedge shoulder 11 for pulling them out of the catch. The latter can be done simply by inserting a rod when the wedges 6 are extended and then the wedges 6 are retracted and thus disengaged; the engagement can be effected by manual insertion.

Claims (10)

1. A circular swaging machine comprising dieclosing wedges (6) for a forging of recesses wherein said wedges (6) are di-sposed between die-actuating rams (2) and dies (3) and are detachably mounted on an adjusting flange (12) and are adapted to be displaced parallel to the axis and in a radial direction by said flange, characterized in that shoulders (11) at the wedge ends of the dieclosing wedges (6) are adapted to be inserted into radial recesses (13) of the adjusting flange (12) and springloaded pins (14) protrude fron the side faces of the recesses (13) and snap into and out of detent recesses (15) disposed laterally of the wedge shoulders (11) as the die-closing wedges (6) are slidably inserted and pulled out, respectively, in an axial direction.

2. A circular swaging machine according to claim 1, characterized in that the detent recesses (15) consist of grooves (15), which extend on edge relative to the longitudinal direction of the die-closing wedges (6).

3. A circular swaging machine according to claim 1 or 2, characterized in that the pins (14) are guided for a limited movement on both sides of the recesses (13).

4. A circular swaging machine according to claim 3, characterized in that the pins (14) have a hemispherical head (14b) and are square elsewhere, and in a preferred arrangement the side which is engaged during the insertion extends at a flat ängle to the wedge shoulder (11), whereas the side which is engaged during the extraction extends at a steep angle and the wedge is formed with a corresponding groove (15b) at its shoulder (11).

5. A circular siaging machine according to claim 3, characterized in that the pins (14) are roof-shaped at their heads (14b) and are square elsewhere and preferably have a flat angle toward the wedge shoulder on the insertion side and a steep angle on the extraction side, and the angle groove (15b) on the wedge shoulder (11) is shaped correspondingly.

6. A circular swaging machine according to any of claims 3 to 5, characterized in that the pins (14) are guided for a limited movement by means of a slot-pin guide (16) or by means of a stop shoulder.

7. A circular swaging machine according to any of claims 1 to 6, charactarized in that a coiled torsion spring (17) extends laterally into each of the pins (14).

8. A circular swaging machine according to claim 7, cüaracterized in that in a machine comprising more than two dies the coiled torsion spring (17) extends with each of its legs (17a, 17b) into a pin (14) which is associated with adjacent recesses (13) of the adjusting flange (12).

9. A circular swaging machine according to any of the preceding claims, charactarized in that the springloaded pins (14) are mounted in a receiving plate (1a), which is screw-connected to tha adjusting flange (12).

10. A circular swaging machine according to any of the preceding claims, characterized in that the wedges (6) have a tongue end opposite to wedge shoulder wedge shoulder (11) and at said tongue end are provided with perforations (19), which are engageable when twe die-closing wedge (6) are to be extracted from the locked position.

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