DE3637760A1 - Arrangement for checking and measuring threads and their rotationally symmetric, coaxial profile as well as their flatness relative to all other diameters, surfaces, tapers, threads and bores on one and the same turned part in one clamping operation - Google Patents

Abstract

A thread ring gauge, divided by 3 x 120@ for example, as a GO ring with maximum size in the outside, effective and minor diameter of the thread is mounted and adjusted together with the exactly matching thread plug gauge on a high-precision, for example pneumatically actuated, three-jaw chuck in such a way that the axis of the thread segments adjustable with the three-jaw chuck and the axis of the three-jaw chuck are exactly in alignment. The end faces and outside diameter of the three-jaw chuck as well as those of the thread segments are ground exactly at right angles to or in alignment with the thread axis. In addition, the three-jaw chuck with the mounted thread segments can be adjusted by 360@ in the axis of rotation with appropriate passage, for example in a step-wise controlled manner by a stepping motor. To position the threaded test pieces, narrow, flexible centring elements which are at the specified thread size are arranged in the webs remaining free between the thread segments. The centring elements have the same thread pitch as the thread to be checked but are rounded off at the thread crests so that the test piece can be put into the arrangement with light pressure as if via a "ratchet". A flexible stop which can be set to the weight of the test piece forms the lower limit. The stop carries out vertical predispositioning and at the same time also serves as an ejector. In this way, the entire arrangement enables the threaded test pieces ... virtually in one operation ... Original abstract incomplete.

Description

The internal and external measurement of threads on turned parts usually done with ring or mandrel thread gauges shape, mainly due to the "threadability" of the value in turned parts manufactured in series production becomes.

To the "good measure", d. H. still permitted maximum and minimum dimensions To determine, must work with two limit gauges or checked, or via so-called thread limit roller and thread limit gauges.

It is also known that other diameters, flat surfaces, Cones, threads, holes, etc. on the same turned part via ko African thread adapters (attached to the thread to be measured) are also checked, but with a relatively high degree of inaccuracy speed, as this can cause tilting of the turned part nen.

If you want to determine individual parameters of threads on turned parts such as core, flank and outer diameter, this will be carried out separately via two or multi-point measurement, or the entire thread profile is drawn with a pre position compared in the "profile projector" compared.

Complex "thread measuring machines" have also become known the one via measuring probes (mechanical, optical, inductive etc.) and corresponding display instruments (e.g. dial indicators) in one the flank, outside and core diameter of the Ge measure the wind.

While in the latter two cases the machine is on wall and the preparation times are very high and the thread is not checked for "smoothness", are very involved in thread testing with ring gauges and mandrels high manual workload when checking turned parts with threads without capturing other individual parameters.

The measuring method is complicated and up to now  several test stations distributed if next to the thread measurement solution in itself, the rotationally symmetrical coaxial course and the flatness of the measured thread to other through knives, surfaces, cones, threads and holes of the same Workpiece is to be determined simultaneously, - one Requirement from the manufacturing industry Precision parts is increasingly being made.

Simplification of thread measurement and rationalization tion in the sense of saving time while at the same time eng increase the precision of mass-produced Turned parts with other reference surfaces, holes, cones, ge winds etc. should therefore be aimed at.

The object of the invention is to use it of a segmentally multiply divided, over a precise Multi-jaw chuck with adjustable thread ring gauge or -Thorns, in a single device and in a single Clamping process, both the thread measurement itself on their goose ability taking into account the permissible "plus and mi tolerance ", as well as the precise course the measured thread to other diameters, areas, Cones, threads and bores of the respective workpiece to determine.

It also becomes another cost-saving automatic Equipped the measuring device made possible by the knife result of coincidences and shortcomings, such as tiredness, inattentiveness etc. of the test person, largely makes you independent.

The measurement result can also by the invention order of known electro-electronic scanning and measurement methods directly digitally displayed or saved and documented on demand for "expression".

Fig. 1 to 5 basically show the mechanical solution in an example on a turned part with an external thread.

All other extensions and modifications, such as "auto automatic assembly ", decrease in measurement, conversion, transfer carry, "measurement documentation" etc. with be known means, go adequately from the description forth.

description

In peculiarity of the invention 1, an example of pneumatically actuated multi chuck (1) according to Fig. Fitted with the manufactured from one piece of segments of a thread gauge ring (2), the thread dimensions preference example (and is related to the measured external thread) in ge rade still permissible maximum dimension.

This ensures that, for example, 3 × 120 ° division of the thread ring gauge, at the later profit deprüflingen themselves, always a real three-surface support takes place because the permissible minus tolerances are smaller threads have dimensions than on the thread ring gauge used.

It goes without saying that the Flat surfaces and outer diameter of both the chuck, such as also that of the thread ring used beforehand exactly at right angles or in alignment with the respective axis of rotation are ground.

The adjustment of the separate segments of the threaded ring gauge is carried out with the help of a precise auxiliary thread mandrel ( 4 ), which in turn has the permissible thread size and is provided with precisely aligned reference surfaces ( 4 a , 4 b , 4 c) .

After adjustment and appropriate anchoring of the thread segments that can now be moved centrally with the three-jaw chuck, the thread under test can be checked and measured for compliance with the permissible tolerance after removal of the auxiliary thread mandrel, by deviations, for example using mechanical scanning and a dial gauge ( 3 ) over the reference surface ( 2 a) are displayed.

In order to carry out prepositioning when inserting the test specimen, a resilient stop ( 5 ) which can be adjusted with the force P is provided according to FIG .

The actual positioning of the test specimen (in order to avoid a meeting of thread tip on thread tip) is carried out according to the invention by the centering elements ( 6 ), which are arranged resiliently between the thread segments, provided with the same thread pitch and resiliently standing on the thread, when inserting and ejecting the Test specimen exert a "ratchet effect" by rounding off the threaded tips ( 7 ) of the centering elements.

Fig. 3 illustrates the principle of operation of the overall device.

The three-jaw chuck ( 1 ), which carries the threaded segments ( 2 ) and the centering elements ( 6 ), is rotatably arranged on a base plate ( 8 ) via an intermediate ring ( 9 ).

On the clamped test specimen ( 10 ) it is clear that, for example, using dial gauges ( 11 a , 11 b , 11 c , 11 d) in addition to the thread measurement itself ( 12 ), all conceivable other surfaces are also measured in relation to the measured thread of the test specimen can be.

Fig. 4 shows that if other threads are running on the same turned part, their running accuracy etc. can also be measured.

A derivation according to Fig. 5.

Before ejecting the test object and after the new one If necessary, the measuring devices will be based on Retracted (not drawn) slide rails or brought back into measuring position.

With a fully automatic execution of the thread measurement the multi-jaw chuck becomes a device, for example via a stepper motor (three-point measurement in one plane) gradually controlled in a given program, the the processes of loading, tensioning and relaxing, and the starting and extending of the measuring elements (for Clearing of the clamping area during assembly) also regulates and controls.

The measured values themselves can be made via modern, known per se Data systems saved and documented for Be expressed.

Claims (6)

1. Device for checking and measuring threads and their rotationally symmetrical coaxial course, as well as their flatness to all other diameters, surfaces, cones, threads and bores on one and the same turned part in one clamping operation, characterized in that a thread ring gauge or mandrel multiple segmental divided on a multi-jaw chuck and so ju stiert that the axes of rotation and plane surfaces are exactly aligned. 2. Device according to claim 1, characterized, that the thread ring gauge or mandrel used is a "good ring gauge or mandrel "with the largest or smallest dimensions in the outside, flank and core diameter. 3. Device according to claim 1, characterized, that the multi-jaw chuck used with appropriate central passage automatically, for example pneuma table stretched and relaxed, and in its axis of rotation gradually by 360 °, for example by hand or over a stepper motor can be adjusted. 4. The device according to claim 1, characterized, that between the thread segments on the multi-jaw chuck ter, resilient centering element standing on the nominal thread dimension elements are attached that have the same thread pitch as have the test thread, in their thread tips each are rounded, so that the thread test piece under slight pressure over a "ratchet effect" on the profit Degrees of the movable thread segments before clamping is aligned. 5. The device according to claim 1 and 3, characterized, that in the passage of the multi-jaw chuck a resilient Impact is arranged on the weight of the thread specimen set, the exact height positioning of the turned part, but at the same time also as an off throwing mechanism for the part after reopening the Ge serves wind segments.   6. The device according to claim 1 to 5, characterized, that measuring measuring devices and / or clocks (mechanical, optical, inductive, etc.) fixed or if necessary assigned on slide rails are with the tension and relaxation processes of the Multi-jaw chuck synchronously, d. H. resetting or run on, so with automatic assembly with the thread test pieces and when ejecting the Clamping range is free.