A clamping method of a micro-sample clamping device

Abstract

The invention provides a miniature specimen clamping device and method. The clamping device comprises a clamping component, an adjusting component, a suction component and a vacuum pump. The clamping component is an internally threaded sleeve, wherein the upper portion of the internally threaded sleeve is open, and a hole is formed in the lower portion of the internally threaded sleeve. The adjusting component is an externally threaded sleeve, and the middle of the externally threaded sleeve is through. The clamping component and the adjusting component are in threaded connection in a matched mode to form a cavity in an enclosing mode. The adjusting component is internally provided with a step. The suction component comprises a hollow core rod. The bottom of the hollow core rod is sleeved with a suction cup used for sucking a miniature specimen. A boss matched with the step is arranged on the lower portion of the hollow core rod. The suction component penetrates through the cavity and is connected with the vacuum pump through an air pipe. According to the clamping device, fixation and height adjustment of the suction component are achieved through the clamping component and the adjusting component; meanwhile, the double-layer suction cup on the suction component clamps the miniature specimen stably so that the miniature specimen can be machined on a metallographic grinder; operation is easy, efficiency and accuracy are improved, and the specimen cannot deform or be damaged.

Description

technical field [0001] The invention belongs to the field of sample mechanical performance testing, and in particular relates to a clamping method of a micro-sample clamping device for clamping a micro-sample for metallographic grinding. Background technique [0002] There are a large number of in-service pressure vessels and pipelines in thermal power, nuclear power, petrochemical and metallurgical industries. The materials of these pressure vessels and pipelines will be damaged to varying degrees after long-term service in a certain environment (high temperature, corrosion, etc.). To evaluate the safety of equipment and predict the remaining life of equipment, it is necessary to accurately obtain the mechanical properties of its materials. The most effective and accurate method is to cut the damaged samples of the equipment, and then test and evaluate various properties of materials according to conventional methods, but this method has obvious damage and destruction to th...

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Problems solved by technology

Compared with the general manual saw blade or grinding wheel cutting, the wire cutting method has the advantage that not only the cutting surface is relatively flat and smooth, but also the cutting affected layer is very thin in general materials and cutting environments, only about 0.01-0.02mm, and this The defect of the processing method is that it can only process samples with a small diameter and a large thickness. For example, when preparing a 0.5mm thick sample in the small punch test, the bar must be cut into 0.6mm thin slices first. For some stainless steel materials, there are problems of poor thermal conductivity and large linear expansion coefficient. Therefore, grinding with a grinding machine is prone to deformation, so it can only be manually ground with water sand until the required thickness. This not only greatly increases labor intensity but also reduces processing accuracy. less than guaranteed

[0006] In the past, the traditional small sample clamping device often used micro-movement connection, such as slotting on the side of the tooling and fastening with bolts. This method requires high bolt fastening force, and small fastening force leads to unstable clamping. Excessive fastening force will cause bending deformation of the sample after thinning

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