Steel pipe cold-drawing mould with twice-reducing and twice-shaping functions
A steel pipe and functional technology, which is applied in the field of molds for producing cold-drawn steel pipes, can solve the problems of low output, high cost of cold drawing, and many cold-drawing passes, and achieve the goals of reducing production costs, good plasticity, and improving dimensional accuracy and smoothness Effect
Active Publication Date: 2014-11-26
XCMG HYDRAULICS CO LTD
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Problems solved by technology
[0007] It can be seen that there are many cold drawing passes, resulting in high cost of cold drawing and low output
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[0018] Such as figure 1 , figure 2 , image 3 Shown: a cold drawing die for steel pipes with double-diameter-reducing and twice-setting functions, which consists of two parts: an inner die 5 and an outer die 4 . The outer mold 4 is installed on the cold drawing machine through the outer mold holder 7 of the cold drawing machine, the front end of the inner hole of the outer mold 4 is a tapered hole reducing belt 4-1, and the rear end of the inner hole of the outer mold 4 is a circular hole shaped Take 4-2. The inner mold 5 is inserted into the hole of the outer mold 4 , and the inner mold 5 is connected with the drawing machine tie rod holder 1 through the tie rod 2 and the nut washer assembly 6 . The blank 3 to be drawn passes through the gap between the inner die 5 and the outer die 4 . It is characterized in that: the first tapered surface reducing belt 5-1, the first cylindrical shaped belt 5-2, the second tapered surface reducing belt 5-3 and the second tapered su...
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The invention discloses a steel pipe cold-drawing mould with twice-reducing and twice-shaping functions, which belongs to machining moulds and comprises an inner mould and an outer mould. Conical reducing belts are arranged at the front end of an inner hole of the outer mould, and cylindrical shaping belts are arranged at the rear end of the inner hole of the outer mould. The inner mould is inserted into the hole of the outer mould and is connected with a pull rod holder of a cold-drawing machine through a pull rod and a nut collar component, and a blank to be drawn passes through the gap between the inner mould and the outer mould. The steel pipe cold-drawing mould is characterized in that a first conical reducing belt, a first cylindrical shaping belt, a second conical reducing belt and a second cylindrical shaping belt are sequentially manufactured on the outer circumferential surface of the inner mould. Past two-pass cold-drawing production is completed by one pass, production efficiency is doubled at least, and manufacturing cost is saved. Secondary deformation belongs to warm drawing, plasticity of steel pipes is better, linearity, dimensional precision and glossiness of the drawn steel pipes can be greatly improved, and the quality of the cold-drawn steel pipes is higher than that of steel pipes produced by two passes.
Description
technical field [0001] The invention relates to a steel material processing die, in particular to a die for producing cold-drawn steel pipes. technical background [0002] With the rapid development of my country's oil cylinder manufacturing industry, cold-drawn steel pipes have been widely used in the manufacture of oil cylinder barrels. The cold drawing die used in the traditional steel pipe cold drawing process uses two sets of dies to perform cold drawing twice, which is cumbersome in process and low in production efficiency. Taking the cold-drawn tube of Φ185*12.5 processed by using a hot-rolled tube blank with an outer diameter of 194 mm and an inner diameter of 162 mm as an example, the production process is as follows: [0003] Before cold drawing, the hot-rolled tube blank is annealed, then surface lubricated and one end of the tube is turned so that it can pass through the inner and outer dies. [0004] The first cold drawing reaches an outer diameter of 185mm an...
Claims
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IPC IPC(8): B21C3/02B21C1/24
Inventor 王家聪刘庆教生敏
Owner XCMG HYDRAULICS CO LTD