DE3020523A1 - SPRING SLEEVE FOR HIGH PRESSURES - Google Patents

Description

Applicant; Company Emuge-Werk Richard Glimpel factory for

Precision tools formerly Moschkau & Glimpel

Title: Spring sleeve for high pressures

description

The invention relates to a spring sleeve for high pressures, with a Spring area, which runs in the circumferential direction, separated from one another by slots, with one another via hinge points connected horizontal beam-like bars is formed, the slots each consistently wide over the length are.

In a known (US-PS 26 10 066) spring sleeve of this type, the thickness of each beam measured in the axial direction is above it Length constant, both in the outer surface and in the interior of the sleeve wall, with the slots exactly parallel to each other and run only in the circumferential direction. A certain breaking load is given by the thickness of the beams which the beams break: the greater the beam thickness, the higher the load on the spring sleeve. On the other hand is the length of the spring sleeve or the spring area of the spring sleeve is also determined by the thickness of the bars. For many applications it is useful if the spring area and thus the spring sleeve is as short as possible in the axial direction.

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It is therefore an object of the invention to create a spring sleeve of the type mentioned at the outset, the spring area of which with a predetermined Breaking load and the specified number of slots or bars in the axial direction is shortened. The spring sleeve according to the invention is to solve this problem, characterized in that the measured in the axial direction of each beam increases in the middle is and decreases towards the two ends of the bar, the slots on the sleeve surface area one in the axial direction have a curved course.

By reducing the beam thickness towards the beam ends, the breaking load of the beam or the spring sleeve is not reduced, since the load on each beam is greatest in the middle and decreases towards the beam ends. However, will by reducing the beam thickness towards the beam ends, the length of the spring area is reduced, since in the axial direction next to each center of the bar does not correspond to the center of the bar

end

thick but narrow Balkerifetücke are provided. The rejuvenation the bar towards the ends does not result in a widening of the slots but a shortening of the spring area in axial direction.

It is particularly expedient and advantageous if the bend of the slots is uniformly continuous over the entire length of the slot extends. Sudden changes in the beam thickness are avoided here.

It is also particularly expedient and advantageous if the ball

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The thickness in the middle is at least 1.5 times the thickness of the beam at the end of the beam. A smaller bar taper is only in Still usable in exceptional cases.

It is particularly expedient and advantageous if the slots in the sleeve wall each run along a plane, which is arranged at an angle smaller than 90 °, preferably approx. 85 ° to the central axis. This is a slot arrangement, which on the one hand enables easy slot production and on the other hand the curved slot course on the sleeve surface area results. The bottom of the slots, which lies in two opposite points on the sleeve wall, runs usually along a straight line, which also simplifies the production of the slots.

The oblique arrangement of the flat slot plane results in connection so that two axially adjacent slots are offset from one another in the circumferential direction, one remarkable cross-sectional design of each of the horizontal diaphragms Bar. In the middle of each bar this is quite thick in the lateral surface relative to the bar ends. However, the Thickness in the axial direction, into the interior of the sleeve. The thickness of the (always measured in the axial direction) also increases Bar at the bar ends in each case from the lateral surface in the radial direction towards the inside somewhat. This effect is the greater the inclination of the plane of the slot, and the result is that the cross-section of the beam is at the end

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is not as weak as it corresponds to the thickness in the outer surface, -and in the middle in the cross-section is not as strong as it corresponds to the thickness in the lateral surface.

It is also particularly expedient and advantageous if the spring sleeve is built into a clamping device for tools or workpieces. It is particularly important with such jigs on the shortness of the spring sleeve. Here, the spring sleeve according to the invention is used to limit the clamping force, the spring sleeve into the power flow between clamping initiation and clamping sleeve is interposed.

The spring sleeve is usually made of steel, but can also be made of plastic or glass. She is used when high pressures are required with short spring deflection: high pressures are permissible loads from 50 kp up to about 3,000 kg; pressures of 500 kp to 3,000 kp are preferred; the permissible load is when the spring sleeve, without to break is maximally compressed.

As a rule, the clamping sleeve according to the invention is not designed as a slotted collet at the ends. Most of them Rather, use cases provide that the spring area is made in one piece between two fixed ends that are compact in itself Guide rings is provided. With this design, the shortened design of the spring area is a particular advantage usable.

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In the drawing is a preferred embodiment of the invention illustrated and shows

1 shows a side view of a spring sleeve for high pressures, FIG. 2 shows a section along line II-II in FIG. 1, FIG. 3 shows a section along line III-III in FIG. 4 through a Clamping device with a spring sleeve for high pressures

and
FIG. 4 is a front view of the clamping device according to FIG. 3.

The spring sleeve shown in Fig. 1 and 2 is made in one piece of steel and is at right angles to the longitudinal extension The cross-section is circular and the wall thickness is constant over the length. A spring area 1 is at both ends each limited by a compact fixed guide ring 2, the spring area and guide rings are together in one piece. the Guide rings 2 each have a cylindrical outer surface and flat end faces parallel to one another on the outside.

In the spring area slots 3 are provided, each Extend essentially in the circumferential direction, with two slots spaced one behind the other along a circumferential line are provided. Seen in the axial direction, two adjacent slots overlap each other 3 · on one side Each slot 3 has a respective bar 4, from the center of which there is an articulation point 5 between two adjacent ones Through slots creates a connection to two adjacent beams, each with one end in this joint

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place open.

As FIGS. 1 and 2 show, each of the is uniform over its length wide slots over its length evenly bent like a circular arc in the axial direction. As a result, the in Axially measured thickness of each beam 4 from its center, i.e. from its central articulation point 4 to its ends 6, i.e. from its central joint 4. H. towards its two joint points at the ends.

The clamping device according to FIGS. 3 and 4 holds a cutting tool 7, namely a milling cutter, in a two-part clamping sleeve 8, which is housed in a base body 9. A guide ring 2 presses against one end of the clamping sleeve 8 Spring sleeve 10, which is supported at the other end via a second guide ring 2 on the base body 9. On the first guide ring 2 engages a tilting ring 11, which by means of grub screws 12 in Can be moved in the axial direction in order to relieve the clamping sleeve 8 from the pressure of the spring sleeve 10. The main body 9 is in two parts and the parts are held together by screws 13. The base body 9 has bores 14 through which, not shown Screws can be inserted to screw the base body to a machine spindle, not shown.

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Claims (6)

Claims (1.) Spring sleeve for high pressures, with a spring) he calibrate, which is formed by horizontal slit-like bars running in the circumferential direction, separated from one another by slots and connected to one another via hinge points, the slots each being of the same width over the length, characterized in that, that the thickness of each beam (4) measured in the axial direction is increased in the middle and decreases towards the two beam ends (6), the slots (3) on the sleeve surface having a curve bent in the axial direction. 2. Spring sleeve according to claim 1, characterized in that the bend of the slots (3) on the sleeve jacket surface extends evenly and steadily over the entire length of the slot. 3. Spring sleeve according to claim 1 or 2, characterized in that the beam thickness in the middle is at least 1.5 times the beam thickness at the beam end (6). 4. Spring sleeve according to claim 1, 2 or 3, characterized in that the slots (3) in the sleeve wall each extend along a plane which is less than an angle 130049/0448 90 °, preferably about 85 ° to the central axis. 5. Spring sleeve according to one of the preceding claims, characterized in that it is installed in a clamping device for tools or workpieces. 6. Spring sleeve according to one of the preceding claims, characterized in that the spring region (1) is provided in one piece between two end-side fixed, compact guide rings (2). 130Ü49 / 0U8