First, the three iron press JB / T8047-95 standards for manufacturing, also known as V-frame of three or three V -shaped iron. HT200-250 using high-quality materials, paired supply, mainly used for the detection precision shaft parts, crossed, given instrument clamping and machining .
Second, the three iron precision : divided into one, two, three .
Third, the three V -shaped frame is mainly used to place a circular piece shaft sleeve, disc, etc., in order to find the center line and draw the centerline. Usually a pair of V -shaped frame is two, two flat and V- grooves are milled in a single installation. parallelism precision V-frame size of each other between the surfaces, vertical error within 0.01 mm, the center line of the V -grooves must be within the plane of symmetry and the V -shaped frame the bottom surface parallel error concentricity, parallelism is also within 0.01 mm of, V -groove half-angle error is within ± 30 ~ ± 1 range. precision V-frame also can dash, V -type frame with clamping bow planes, cylindrical workpieces can be clamped firmly in a V- rack, flip to various locations crossed.
Four, three parallel iron common specifications related parameters :