SU1357681A1 - Zero measuring head - Google Patents

Abstract

The invention relates to the field of technical measurements in mechanical engineering, in particular to measuring chucks for coordinate measuring chambers (CIM) and (;; G: Y:, turning machines with CIUs. The scope of the invention is a new measurement accuracy. The goal is achieved by the fact that the measuring lever 3 is guided by the middle part} ia of the membrane 2. The lever 3 carries the tip 4 at one end, and the other socket 5 on the other end. Trn of the electrical contact 6 are located on the inner surface of the second conical sockets 7, made in the housing 1. Internal The surface of the nest 7 is covered with an electron-electron core material. Between the sockets 5 and 7 there is a free contact sphere 8. Pressing the sphere 8 to the contacts 6 is removed by a spring 9. The contacts 6 are electrically connected to the block 10, including 1 logical scheme. OR The common axis of the sockets 5 and 7 may coincide with the Irodol axis of the measuring lever 3 or be its internal. 2 s. N. f-ly, 1 ill. S sl with sl Oi ac

Description

The invention relates to a measurement technique and can be used in coordinate measuring machines (CMMs) and CNC machines.

The aim of the invention is to improve the accuracy.

The drawing shows a structural diagram of the measuring head.

The null measuring head comprises a housing 1, to which the measuring lever 3 is suspended on its membrane 2, the measuring tip 4 is suspended, the measuring tip 4 at one end, and the conical socket 5 at the other end. Three electrical contacts 6 are located on the inner surface of the second conical socket 7, made on the housing 1. The inner surface of the socket 7 is covered with electrically insulating material. A contact sphere 8 is freely positioned between slots 5 and 7. The pressing of sphere B against contacts 6 is provided by spring 9. Contacts 6 are electrically connected to block 10, which includes the OR logic circuit.

The common axis of the conical sockets 5 and 7 may coincide with the longitudinal axis of the measuring lever 3 or be perpendicular to it.

Null measuring head works as follows.

During the measurement process on a CMM or a CNC wall, the head body 1 moves in the direction of the product being tested (not shown), the measuring tip 4 touches the surface of the product and deflects the measuring lever 3. In this case, the socket 5 is displaced relative to the socket 7, the contact sphere is clamped between the sockets 8 starts rolling between them and stops touching at least one of the contacts 6. As a result, at least one of the two electrical circuits is interrupted, in which contacts 6 are connected in pairs, and the OR circuit generates a signal l of touch measuring tip surface of the article. Spring 9, seeking to return the nest 5 to a stable position, in which the axis

0

five

0

five

0

five

0

the sockets coincide, create a measuring force, which coincides with the direction of displacement of the measuring tip from its initial position during the measurement, i.e., normal to the measured surface. When the measuring head is retracted from the product, the spring 9 tightens the sockets 5 and 7 until they are completely closed around the circumference with the sphere 8, which leads to the closure of the contacts 6.

The free placement of the contact sphere between the sockets eliminates sliding friction between the contacts, which improves the accuracy of the initial installation of all the moving parts and, accordingly, the measurement accuracy. The placement of the contacts 6 on the surface of the conical socket provides a greater depth of arresting the measuring.

Claims (3)

1. A null measuring head, comprising a housing, a measuring lever suspended from it on a membrane with a measuring tip at one end, a contact sphere connected to the other end of the lever, three electrical contacts rigidly attached to the housing. a sphere, and a spring for pressing the sphere against the contacts, characterized in that, in order to improve accuracy, at the second end of the measuring lever and on the body there are made conical sockets, facing each other, conical sockets, between which the contact sphere is loosely located, and electrical contacts are placed in the housing socket on its inner surface, which is covered with electrically insulating material. 2. The measuring head according to claim 1, characterized in that the circumferential axis of the conical sockets is perpendicular to the axis of the measuring lever. 3. The measuring head according to claim 1, wherein the common axis of the conical sockets coincides with the longitudinal axis of the measuring arm.