In a universal material testing machine, the fixture plays a decisively important role in the entire testing process. According to different test methods, fixtures can be divided into tension, compression, shear, bending, peeling, etc. fixtures, among which tension fixtures account for the largest proportion.
The magnitude of the test force that the fixture can withstand is an important indicator of the fixture. It determines the size of the fixture structure and the strength of the fixture during operation. During the test, the material is divided into metal and non-metal, the shape is divided into size, and the composition of the material is also varied. The test force of the product sample tested in the test is also different. As large as tens of tons, as small as tens of centimeters of cattle. Therefore, when choosing a fixture, it is necessary to design suitable fixtures according to different test forces, tested product samples and shapes and sizes.
Generally speaking, for metal and non-metal test product samples, the jaws of the fixture are in direct contact with the sample. Generally, high-quality alloy structural steel and low-carbon alloy steel are selected. Cold work die steel, etc. Through appropriate heat treatment process to increase its strength and wear resistance. Sometimes special steel is also installed on the jaws, or the surface of the jaws is coated with emery. For some fixtures with small test force, such as plastic film, fiber wire and other sample fixtures, the surface that is in contact with the sample is made of sticky soft rubber. The whole fixture is generally made of high-quality medium carbon steel and alloy structural steel. Through appropriate heat treatment process to increase its mechanical properties. Sometimes, non-ferrous metals such as aluminum alloy and special metals are used to reduce weight.
According to the needs of customers, Shanghai Qingji Company develops fixtures and test equipment with different functions. Everything for customers to provide the best quality technology and service. Our company specializes in R & D, production, sales and service of well-known enterprises engaged in testing instruments, research and development of various electronic universal testing machines, tensile testing machines, three-point / four-point bending testing machines, strength testing machines, peel testing machines, tensile strength Testing and testing equipment such as testing machines and environmental testing chambers.
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