DE3236212A1 - Centring chuck for rotationally symmetric parts in metrology and test engineering - Google Patents

Abstract

The centring chuck described above for rotationally symmetric parts in metrology and test engineering is especially distinguished by the fact that statically determined adjustment, support and centring is made possible by the 3-point support and 3-point clamping/centring of the test piece. At the same time, only one and the same chuck is required for internal and external mounting of the test piece so that stockkeeping and costs are considerably reduced. The type of construction is compact and can be exactly defined with regard to manufacture and mode of operation. The holding forces for the test piece are adequate and the locking is guaranteed. Adjustment in the range of the min. and max. envelope circles which define the clamping range of the chuck is quick and problem-free as a result of appropriate transmission in the drive system. Thus, in the present case, about seven turns of the key at the adjusting pinion are used in order to cover the diameter range of 20 to 120 mm, which proves to be a substantial advantage with regard to conventional manual and power-operated chucks, since the time needed there is much greater. This chuck is deliberately not conceived as a clamping chuck and primarily has a centring function with a nonetheless adequate holding force for driving the test piece during the measuring operation. At an induced torque at the adjusting pinion of about 25 daNcm, a minimum holding force at the centring and holding pins of (in the present case) about 18 daN is obtained. This force is ... Original abstract incomplete.

Description

Description:

Title: Centering chuck for rotationally symmetrical parts in measuring and Testing field of application: The invention relates to a centering and conditionally a Chuck for the rotating drive of corresponding disks or rings, which for interference factors (e.g. cracks) with corresponding non-contact measuring methods should be examined. The advantage of the feed described here (invention) lies inter alia in that there is no external or internal centering of the parts (test objects) special chucks or jaws in the chuck (similar to conventional lathe chucks) are required, so that there are no corresponding changeover times. Furthermore, Due to the corresponding gear ratio, a very large clamping or diameter range Quickly and effortlessly adjustable with absolute guarantee of the centering and holding function of the test specimen during run-up and braking of the chuck, which is steplessly A ring-dependent target speed for the test process via gear motor and control logic receives.

State of the art: With conventional chucks, indoor or external voltage, a corresponding conversion is required and the adjustment itself takes a considerable amount of time for the diameter range alone, when changing from the lower diameters to the upper diameters periodically must change. In addition, the diameter adjustment is usually radially by Socket wrench is made for what invention described herein procedurally obstructive.

Task: The invention is based on the task of a centering and conditionally to design a chuck that is light and Quickly adjustable and can be used directly for internal and external clamping without retrofitting is. The diameter ranges should be adjusted axially (on the face); by hand using a socket wrench with torque clutch. How the Feed is vertical.

Solution: The object is achieved according to the invention by instead of a known spiral or wedge bar principle of known manual and power chucks an epicyclic gear system with worm gear locking is used. By the arrangement of 3 planet gears in 1200-offset, which at the same time cam carrier are, through appropriate design of the cams is a plan support of the test object given, which by centering and holding pins inserted exactly on the cams automatic centering of the test object when clamping with a socket wrench results.

As a result of worm drive and appropriately designed bevel gear is when adjusting the sun gear and the corresponding gear ratio to the planet gears, which are directly coupled with the chuck cams, a problem-free and fast one Adjustment of the clamping ranges from min .- # to max .- # given. The diameter range adjustment occurs polar over the 1200 offset planetary gears or Chuck cams, which at the same time form the support for the test items.

The centering function takes place in a positive and negative direction of rotation equally good and gives a sufficient holding force during the start-up process or testing and braking process of the chuck. The locking of centering and Holding force is provided by the selected screw pitch as a result of self-locking. the The direction of rotation of the centering chuck during operation also has no influence here the function of the feed. The chuck body is inserted according to the tangential Drive and locking worm with bevel gear drive dynamically balanced, see above that a smooth run during the testing process - in the corresponding machine, as under claim, The generic term of the third sub-claim is guaranteed to be executed.

Advantages: The advantages that can be achieved with the invention are that a) only one chuck is required for internal and external clamping of the test objects, b) a sufficient quick adjustment of the diameter ranges is guaranteed, which is considerably above the known manual and power chucks, c) a good one Ease of use of the chuck is given d) compact design of the chuck and e) No risk of contamination of the drive system as it is completely enclosed is present, Description of function and use: Using the attached Drawing (centering chuck for rotationally symmetrical parts in measurement and testing), DIN A 4, the function is described as follows: They show: 1 chuck housing 2 chuck covers 3 setting pinion 4 setting worm drive 5 sun gear ring 6 planet gear for cams 7 Cams for centering and holding / holding pins 8 Centering and holding pin 9 test item 10 Drive flange on testing machine 11 Machine table The centering chuck is on a corresponding drive flange (10), which is mounted in the machine table (11), Via the chuck housing (1) and chuck cover (2) directly by means of a centering collar and cylinder screw.

positively and non-positively attached. The drive axis is vertical, so that the test objects (9) in a horizontal position in the test position by means of centering and retaining pins (8) directly on the cams for centering and retaining pins (7) rest and be held centrically either inside or outside. The speed of the centering chuck depends on the test diameter and is driven by a corresponding stepless drive machine (actuator) with the test unit or Test system specified.

The centering of the test object is carried out via 3 points by means of a centering and retaining pins (8) compulsory and can optionally be inside or outside so that only one centering chuck can be used.

The centering and holding pins (8), which are on the cams for centering and retaining pins (7) are positioned, describe a polar circular path to the center the planet gears (6) which in turn are offset by 1200 with the sun gear rim (5) are engaged.

The test items lie directly on the cams for centering and retaining pins (7), which in turn directly form and force fit with the planetary gears (6) are connected and adjusted. The stepless test specimen - # - clamping range is through the enveloping circles around or in the centering and holding pins (8) defines which are result when the planet gears (6) accordingly over the sun gear rim (5) evenly adjusted. The centering and holding pins move over an 1800 circular path which with beams 0 to 12 on the cams for centering and retaining pins (7) are marked in the drawing. The clamping range begins practically at Strahll and ends at ray 11 with the corresponding inner and outer enveloping circles, which at the same time define the clamping range of the centering chuck in practice. The centering and retaining pins (8) are interchangeable, so that on a case-by-case basis on any test object contours (9) special consideration can be given by appropriately trained centering and retaining pins (8).

When the chuck is centered, play is automatically compensated for on the center of the axis of rotation of the centering chuck, since the Tooth flanks of the planet gears (6) each evenly on the tooth flanks of the sun gear ring (5) so that the defined and desired tooth gap play has no effect on the centering of the test item (9).

The one between the chuck housing (1) and the chuck cover (2) and centered sun gear rim (5) is via a worm gear outside directly by means of Adjusting worm drive (4) driven and locked due to self-locking of the worm pitch, so that the centering of the test object in the test operation with sufficient support is guaranteed; (Ring bracing).

The adjusting worm drive (4) is via an adjusting pinion (3) with a corresponding Translation via bevel gear set directly from above with the corresponding key that comes with Torque ratchet can be equipped, driven so that a corresponding fast and stepless adjustment of the enveloping circle diameter changes described above can be achieved.

Alternatively, a corresponding one would also be used instead of the worm drive Multi-disc clutch system with locking conceivable and should therefore be used here as a variant It should be noted which ones specifically for this purpose are to be submitted later for registration purposes can be.

The direction of rotation of the centering chuck during operation is arbitrary and has on the frictional locking and on the centering of the test object Influence.

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Claims (1)

Claims: Preamble of the centering chuck of the 1st main claim 9 Centering chucks for rotationally symmetrical parts in measuring and testing, identifiers Part of the claim: characterized in that this feed for use in non-contact measuring method for centering corresponding parts (e.g. bearing rings) is suitable and designed. The centering of the test parts is without exchanging Jaws equally well suited for internal and external clamping. The working position of the chuck axis is vertical, so that the to be tested Rings lie flat on the chuck cam. The test items are centered Via a planetary gear through the centric provision of the centering and retaining pins on a circular arc path offset by 120 °, which is passed through the planetary gears is defined. The centering and retaining pins are in the cams, which at the same time form the ring plan support, precisely arranged. The cams themselves are directly with positively connected to the planet gears. The respective centering lock takes place Self-locking via a worm drive arranged tangentially to the sun gear and easily accessible adjustment drive by means of a bevel drive vertically from above the feed. Preamble of the 1st dependent claim: 2. Centering chuck for rotationally symmetrical Parts in measuring and testing, characterizing part of the claim: characterized in, that the feed can easily be used in the corresponding test processes in single and mass production Can also be integrated retrospectively, s # '# existing non-contact test systems have it converted or retrofitted accordingly. Due to the externally arranged cams with the corresponding interchangeable ones Centering and retaining pins ensure that contamination inside the Chuck is not possible and surface grinding of the cams is possible on a case-by-case basis (support of the test items). Preamble of the 2nd dependent claim: 3. Centering chuck for rotationally symmetrical Parts in measurement and testing, characterizing part of the claim: characterized thereby, that the dimensions of the chuck are extremely compact in relation to the clamping range of the test specimen -for internal and external clamping or -centering- with one and the same chuck in certain diameter ranges (here: inside # from 20 to 130 mm and outside # from 20 to 120 mm). Chuck sizes for other diameter ranges of the test items can be achieved easily, so that the user community very diverse can be. The outside diameter of the chuck is sometimes approx. 100 mm larger than the largest Diameter of the desired test item, so that there is a meaningful size coverage can be realized with corresponding clamping 0 ~ overlaps, which is the storage can influence favorably. Preamble of the 3rd subclaim: 4. Centering chuck for rotationally symmetrical Parts in measuring and testing, characterizing part of the claim: characterized in, that with this chuck complete testing machines can be created in a modular system and can thus be tailored to the various needs. Here can a fully automatic provision of the measuring probes by means of NC -! ## <- controlled coordinate slide Program ring type-specific so that different series test items can be identified by digit code If the measuring probe is provided, manual setting of the coordinate slide is unnecessary This is then made possible and in the simplest possible way different types of rings can be checked with the feed. This would be e.g. B. in sample audits interesting for the individual series. The feed can be sensible through accordingly Transmission ratios from minimum to maximum diameter quickly and easily adjust.