SU1227933A1 - Measuring contact head - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to expand the technological capabilities of the head by increasing the free stroke of the measuring rod. The measuring touch head contains three pairs of contact cylinders mounted on the body, two of which are aligned, and one is perpendicular to it, a disk with a measuring rod at an angle to the disk of less than 90 °. The disk has three spherical contacts. To control the shape of the curved surface, a set of heads are used, the tips of which are mounted in one reference plane. When the measuring surface touches the measuring tip, the measuring rod rotates around an axis passing through the contacts of two coaxial pairs of cylinders, and a third of the contact group opens. Upon further movement of the head, the tip rotates freely around this axis, and the tips of the other heads touch the measured surface, determining its shape. 1 hp f-ly, 3 ill. with ate ND Yu CO 00 00

Description

The invention relates to a measuring technique and can be used, in particular, in the process of controlling curved surfaces.

The purpose of the invention is to expand the technological capabilities of the head by increasing the free stroke of the measuring rod.

Ma FIG. 1 shows a structural diagram of the head; in fig. 2 - section AA on (|) u. 1 (on the third spherical contact); in fig. 3 is a measurement scheme on a reference measurement; 1 machine (CMM) using a set of touch heads.

The measuring contact head includes a housing 1, two bunks of contact cylinders 2, the axes of which are parallel to the axis passing through two spherical contacts 3, each interacting with its pair of cylinders 2 and a third pair of contact cylinders 4 interacting with the third spherical contact 5. Axes of cylinders 4 are perpendicular to cylinder bores 2.

The spherical contacts 3 and 5 are placed osmymmetrically in the same plane on the disk 6, which is rigidly connected to the measuring rod 7. The rod 7 is spring-loaded to the body 1 by the spring 8 and has a measuring accumulator |; to 9. The axis of the measuring rod 7 has with the plane of the Kogggakts 3 and 5, the angle is less than 90 °. In the upper part of the rod 7, a protrusion 10 is made, which interacts with the ends 1 of both pairs of cylinders 2. From the case 1, the contact cylinders 2 and 3 are electrically insulated by a strip 12.

Before starting to control the shape of the curved surface 13 with a set of heads, the tips 9 of the clip 7 and 7 of all heads are installed in one reference plane 14 (Fig. 3).

Measuring; 1 touch works as follows.

The movement S (Fig. 3) of the housing 1 of the operating unit CMM is recorded, for example, by a computer. At a certain interval of movement (e.g., through 0.01 mm), the state of the contacts of all heads is queried.

When the first of ycTBHOBj ieHUbix touches the body 1 of the heads with its measuring tip 9 at the highest point of the surface 13, the rod 7 together with the disk 6 is pivoted around the axis passing through the spherical contacts 3, and the contacts 4 and 5 open. The circuit of the electronic relay (but not shown) opens, and the register of the computer device receives a sigal associated with the corresponding 1, by interchanging S of the housing 1.

When measuring the surface 13 of the double curvature, the lateral component of the force from the interaction of the tip 9 with the top

13 may be greater than the component acting in the plane of the rod 7. Then, under the action of the side component, one of the spherical contacts 3 moves away from at least one of the contact cylinders 2, and the electronic relay circuit also opens.

Further, the action of the lateral component through the protrusion 10 of the rod 7 is extinguished at the inner ends 11 of the corresponding pair of cylinders 2, therefore the rod 7 further rotates around the axis passing through the spherical contacts 3 for the whole free stroke and opens contact 5 with the cylinders 4 Due to the presence of the protrusion 10, the contacts 3 are constantly in the zone of interaction with the cylinders 2, and the rod 7, when removing the measurement load, stably returns to and from; X one position.

Upon further movement of the housing 1 in the direction S, the rod 7 of the nerve head of the noo.Objects rotation around the axis, the passage of phey through the spherical contacts 3, and the following heads enter into interaction with the surface 13 (Fig. 3). The magnitude of the deflection of the measured surface 13 and the corresponding movement S of the body 1 are determined by the size of the free run. 1 measurement ends after the last head of the opening.

rod /. 1 actuation

0

five

0

five

their number in the set.

Claims (2)

 Invention Formula The measuring head of the touch, comprising a housing, three parallel and one para. pairs of contact cylinders mounted on the housing, a spring-loaded measuring rod, a measuring tip installed on the single end of the measuring rod, mounted on the other side of the measuring rod, a disk with three spherical contacts located 3 axis of the same plane and each with its bore contact cylinders, which is different with -I eM, which, in order to expand the technological capabilities, the two bunk cylinders are located parallel to the axis It through two spherical contacts, the axes of the third pair of cylinders are perpendicular to this axis, and the axis of the measuring rod is located at an angle of less than 90 ° to the plane of the spherical contacts. 2. The measuring head according to claim 1, characterized in that, in order to increase the rigidity, the measuring rod is provided with a protrusion constantly interacting with coaxial pairs of coaxial pairs of cylinders. fzg.2 Vui.3 one Compiled by M. Kirillov Editor T. ParfenovaTehred I. VeresKorrektor DA. UJapoiuH Order 2004/41 Circulation 670 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Branch PPP "Patent, Uzhgorod, st. Project, 4