Automatic dumbbell-shaped sampling machine

Abstract

An automatic dumbbell-shaped sampling machine comprises a machine frame; a longitudinal reciprocating moving platform and a transverse moving platform are installed on the machine frame, the longitudinal reciprocating moving platform is provided with a fixture body and an explorator, and the transverse moving platform is provided with a milling cutter; and the front portion and the rear portion ofthe transverse moving platform are provided with counter weight devices correspondingly which are the same, and the milling cutter abuts against the explorator under pressing force action of the counter weight devices. The automatic dumbbell-shaped sampling machine achieves the effects that the automation degree of the manufacturing process is high, the pressing force between the milling cutter and a sample is constant, and milling one-time forming is conducted.

Description

technical field [0001] The invention belongs to the technical field of dumbbell-shaped sample making machines, in particular to an automatic dumbbell-shaped sample making machine. Background technique [0002] Dumbbell-shaped specimens are standard specimens used to determine the tensile properties of thermoplastic pipes. In GB / T8804.1-2003 "Determination of Tensile Properties of Thermoplastic Pipes Part 1: General Principles of Test Methods", it is clearly pointed out in the clause 5.2.2.3 "Machining Methods" that "to prepare samples by mechanical processing methods, milling is required. " specific requirements. [0003] At present, there are mainly three types of dumbbell-shaped prototype machines on the market: the first type is mainly manual operation, that is, the sample is fixed in a fixture with a dumbbell-shaped master, and the motor drives the spindle to make the milling cutter rotate. The operator holds the handle on the jig with his hand, on the one hand, exerts...

AI Technical Summary

Problems solved by technology

During the processing, due to the uneven force of the operator, the uneven moving speed of the fixture, and the inconsistent moving direction, it is easy to cause problems such as poor surface quality of the sample, resulting in excessive scrap rate; at the same time, the operator The labor intensity is high and the risk is high, but due to the low price of the equipment, the application range in the market is relatively wide

The second type is the CNC dumbbell-shaped prototype machine, which uses the CNC program to control the movement trajectory of the milling cutter. Its processing efficiency and processing quality are high, but there are disadvantages such as expensive equipment, high processing cost and maintenance cost, so it is rarely used in the market.

The surface quality of the sample processed by this method is better, but the pressing force of the spring between the milling cutter and the sample changes due to the change of the stretching length of the spring during processing, and the sample cannot be milled successfully at one time, and needs to be returned to the starting point for reprocessing , resulting in processing errors

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