How to extend the life of lead screw trapezoidal screw due to the use of the sliding surface at runtime to support the load, it will generate friction and heat phenomenon, the process, the sliding surface will be some wear and tear. PV curves define the safe operation of the load and speed limits. When the load increases, the need to reduce speed, trapezoidal screw production, to prevent overheating and wear; and vice versa. Thus, when the load is small to achieve high screw rotation speed, and the load is large, processing trapezoidal screw, the screw needed to run slowly. It should be noted that, under the premise of not increasing the speed, by increasing the screw lead screw to increase straight line speed. This method can be used to extend the service life of the screw trapezoidal screw workmanship standards acme screw thread requiring precise movement as a key component in the movement, mainly high-quality alloy steel processing, trapezoidal screw, after heat treatment, to ensure its excellent mechanical properties, in the manufacturing process, coarse and fine step apart, effectively ensure a reasonable distribution of stress components, the key processes in a constant temperature processing workshop, a stable temperature, high precision lead screw to ensure that all indicators meet the national standard JB / T 2886- 1992 Machine acme screw, nut acceptance criteria technological conditions. Ball trapezoid accuracy class and acceptance criteria: R logo screw, right-handed screw is generally not marked. 7 Screw - For precise drive, precision screw lathes, exon grinder, surface grinder feed motion and so on. Trapezoidal screw Conversion Table 1, tooth type angle trapezoidal thread is generally α = 30 °, the pitch P is determined by the thread standard, different standards, different pitches; 2, crest clearance ac: when P = 1.5 ~ 5 时, ac = 0.25; P = 6 ~ 12 when 时, ac = 0.5; P = 14 ~ 44 when when ac = 1; 3, external thread large diameter d: the diameter d2 = d-0.5P; small diameter d3 = d-2h3; tooth High h3 = 0.5P + ac; 4, internal thread: large diameter D4 = d + 2ac; the diameter D2 = d2; trails D1 = dP; tooth height H4 = h3; tooth top width f = 0.366P; alveolar bottom width . w = 0.366P-0.563ac has imported CNC lathes, Taiwan Shi-wen trapezoidal screw, milling machines, lathes, centerless grinding machines, table lathes and other specialized equipment. Professional manufacturing acme screw / square screw / long screw / to cover screw / screw conveyor / roller screw / special screw / worm and all kinds of ancillary and other nuts. Products applicable to satellite antenna drive equipment, massage fitness equipment, open windows equipment, woodworking machinery, packaging machinery, printing machinery, machinery, paper machinery, pipe cutting machine, pipe machinery, reducer ﹑ screw lifter motor axis, lathe lead screw, milling machine, valves, etc. acme screw, acme screw manufacturers, Korea and Taiwan transmission machinery (certified merchants) provided by the Dongguan City, South Korea Taiwan Transmission Machinery Co. Dongguan City, South Korea Taiwan Transmission Machinery Co., Ltd. (www.dghantai.com) (www.hantai168.com) is specialized in "chrome rods, bearing steel, hollow axis, linear bearings HIWIN, PMI, TBI" of enterprises, companies adhering to the " honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr Mei.