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Measuring the quality of bent steel parts-from angle rings to steel pipes

Measuring the quality of bent steel parts-from angle rings to steel pipes

The steel pipe bent into a "U" shape is inserted into the connection of the tractor; the valve stem is tee welded on the curved plate as a reinforcement of the storage tank. These parts are usually provided by companies specializing in military bending and bending steel. Original equipment manufacturers (OEMs) turn to such specialized manufacturers because pipe benders/rollers usually provide better quality, better response time, better service and Higher value. Perhaps the greatest demand of OEMs is quality. This raises the question, how should we measure the quality of bent steel parts?

A good definition of quality is to meet customer specifications. For curved steel, the size specifications usually include the following:

Material type: hot rolled, stainless steel, aluminum, etc.

Section type: angle steel, channel steel, rod, tee, pipe, pipe, guide rail, etc.

Direction: "hard road" is prohibited, inward tilt angle, tilt angle to tee, etc.

Radial: inside, outside, centerline, etc.

Arc or arc length

Tangent length (if any)

Special specifications for off-axis, spiral, multi-radius, compound elbow, etc.

For example, some common items, such as standard angle rings with a diameter from 3in to 72in, usually have an inner diameter tolerance of +/- 1 / 6in, but for some applications, this tolerance is +/- 1/32 inch. In the jack, the outer TIR (total reading tolerance indicated) of the largest steel ring is +/- 1/8 inch. The tolerance is + 0 / -1 / 8in.

Many other tolerances may be specified, such as flatness, welding quality, hole size and location, and manufacturing tolerances (for example, welded anchor plates on tunnel supports).

Benders/rollers usually have their own internal standards and meet the needs of most OEMs.

In addition to dimensional tolerances, there may also be specifications for surface finish, packaging, coating, etc.

Many OEMs provide quality scorecards to their suppliers to indicate the percentage of parts received that meet their quality standards. Many suppliers track their own quality records. , And determine the root cause of the problem. Analysis of the root cause of the problem led to its elimination. The global standard for company quality is the cost of nonconforming parts (labor, materials, credits) divided by the total cost. This size can indicate the percentage of the company's quality improvement and the success rate of meeting customer needs.