Manufacturing method for zero-length spring and zero-length spring

Abstract

The invention provides a manufacturing method for a zero-length spring and the zero-length spring, and relates to the field of sea-air gravity meters. The manufacturing method for the zero-length spring comprises the steps that a microstructure of a wire material is adjusted through a solid solution strengthening treating process, wherein the wire material is a constant elastic wire material; molding treatment is conducted on the solid solution wire material; pretension force is applied to a first spring through a reverse rotation mode; and tempering treating is conducted on a second spring. The manufacturing method for the zero-length spring is more systematic and scientific and high in precise so that the zero length error delta l of the zero-length spring is less than or equal to 1 millimeter, the drifting amount delta is less than or equal to 10<2>[mu] per day, the rigidity error k is less than or equal to 0.01 gram force per millimeter, and the difficult problem of physical zero length which cannot be solved by a traditional process is solved.

Description

technical field [0001] The invention relates to the field of sea-air gravimeters, in particular to a method for manufacturing a zero-length spring and the zero-length spring. Background technique [0002] Acceleration of gravity is a basic physical constant, and accurate measurement of acceleration of gravity is of great significance in the fields of earth science and resource exploration. [0003] With the rapid development of modern technology, springs are widely used in precision scientific instruments as important elastic components. However, ordinary positive-length springs have disadvantages such as low sensitivity, difficulty in overcoming lateral acceleration disturbance as a dynamic measurement sensitive element, and large creep relaxation, which limit their application in the field of microgravity measurement. As the sensitive core element of micro-displacement measurement, the metal zero-length spring has the advantages of simple structure, reliability, small rel...

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Problems solved by technology

The only research in China is also limited to Chen Zhiyuan and others from the Seismological Research Institute of the National Seismological Bureau. Around 1990, they studied the equivalent zero-length spring (essentially a negative-length spring, with two ends The connection drawing is equivalent to a zero-length state, not a true zero-length spring), the spring material used in its development process is an elastic alloy with a high elastic modulus (code-named 3J53), and the elastic modulus temperature coefficient of the alloy material is Narrower, which limits the ambient temperature used by the gravimeter, which is obviously not tolerated by the dynamic sea-air gravimeter

At the same time, the spring obtained after the spring turning process is a negative-length spring, which does not have the ability to overcome lateral disturbances (the acceleration of lateral disturbances will cause the spring to deviate from the vertical position by a certain angle, resulting in a change in the length of the vertical direction, thereby introducing gravity measurement errors. Much larger than the 1 milligal accuracy design of the sea-air gravimeter), so it cannot be practically applied in dynamic gravimeters and portable gravimeters

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