High temperature box testing machine High temperature furnace testing machine Testing machine price
1. Features of the fixture
a. We know that the sample (or product) is clamped by the clamp to add force to the sample. The magnitude of the test force that the clamp can withstand is an important indicator of the clamp. It determines the size of the clamp structure and the labor intensity of the clamp operation. The sample material is divided into metal and non-metal, and the shape is divided into sizes. The composition of the material is various, and the test force that the sample can withstand is as small as tens of centimeters of cattle (such as spandex for textile), and as large as tens of tons (such as ordinary steel
b. Requirements for fixture materials:
â‘ . For general metal and non-metal samples, the jaws of the fixture directly contact the sample. Generally, high-quality alloy structural steel, alloy high carbon steel (or low carbon alloy steel), cold work die steel, etc. are selected. The heat treatment process (quenching and tempering, carburizing and quenching, etc.) increases its strength and wear resistance
â‘¡. For some fixtures with small test force, sticky soft rubber is used for the surface in contact with the sample. (For example: plastic film, fiber wire and other specimen clamping surface.)
â‘¢The clamp is generally made of high-quality medium-carbon steel and alloy structural steel, and its mechanical properties are increased through an appropriate heat treatment process. Sometimes non-ferrous metals such as aluminum alloys and special metals are used to reduce weight. Sometimes cast structures are also used (cast steel, cast aluminum, etc.)
c. Requirements for fixture structure:
â‘ . The design of the fixture is mainly based on the test standard of the material and the shape and material of the sample (specifically the finished product and semi-finished product). The test standards mentioned above refer to ISO, ASTM, DIN, GB, BS, JIS, etc., as well as enterprise standards, industry standards, etc. These standards are generally tested
â‘¡. The fixture itself does not have a fixed structure (such as the wire can be clamped by winding, or two flat plates, and the thin metal sample can be clamped by wedge or by clamping), which There is a clear difference from the host. Hosts at home and abroad
American TestResources mechanical testing system, all-electric servo static tensile, compression, torsion testing machine, dynamic & fatigue series testing machine, equipped with various professional fixtures, can also be used for other brand testing machines â‘¢. The fixture itself is a locking mechanism, we know the machinery The locking structures on the top are: thread patterns (that is, threads, screws, nuts), inclined planes, eccentric wheels, levers, etc. The fixture is a combination of these structures. There is no fixed pattern in the structure of the test machine fixture, according to different
2. Current status and development trend of fixtures
a. The development direction of the testing machine is from sample preparation testing to product (i.e., finished and semi-finished products) testing, which requires that the corresponding jig be changed from the jig originally used for standard sample testing to the jig used for product testing development of.
b. The use of fixtures is developing in the direction of high efficiency and low labor intensity. In the past, fixtures were generally mechanically locked, which was time-consuming and labor-intensive, labor-intensive, and inefficient. With the improvement of the working environment and the need for large-scale testing (random random inspection of the production line), the clamping method of the fixture
c. Fully automatic fixture: from the measurement of the sample size to the clamping, to the start of the test, and finally the test report is completed at one time. Such fixtures are very costly and are only suitable for testing and inspection of large quantities of the same samples or finished products.
d. The increase of environmental tests (high and low temperature tests), the increase in the use of high and low temperature fixtures. The increase in environmental tests (high and low temperature boxes) makes it more difficult to design fixtures. We know that the national standards for high-temperature tensile testing have provisions: threads for round specimens and holes in plate specimens. by
e. Increased number of continuous test fixtures. In the past, samples were generally tested for testing, and the stretching and compression of the samples were carried out separately (that is, the stretching and compression were performed with different fixtures), but now more and more finished products are tested, and the samples are in the same test To be stretched and compressed,
f. Increased test fixtures for special industries. With the development of science and technology, some emerging industries have put forward new requirements for test fixtures, such as the requirement that the fixture structure is small, non-magnetic, and corrosion-resistant (tested in solution) and so on.
Suzhou high-quality testing instrument mechanical test system all-electric servo static tensile, compression and torsion testing machine, dynamic & fatigue series testing machine, equipped with various professional fixtures, can also be used for other brand testing machines. Due to the particularity of the fixture used in the testing machine and the continuous emergence of new materials, the fixture design has been in a passive situation. We encounter new materials every day and need to design new fixtures. We constantly sum up the past successful experience to adapt to the new development trend.
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