A circular metal tube rolling die
A metal tube and calendering die technology, applied in wire drawing dies and other directions, can solve the problems of uneven longitudinal and lateral flow of metal, increase production costs, and uneven rounded corners, achieve simple design and production, save production costs, and save materials. cost effect
Active Publication Date: 2017-06-16
JIANGSU HUACHENG IND PIPES
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Problems solved by technology
[0003] As we all know, if the opening size of the drawing die and the length of the entrance section are set unreasonably, the contact area between the pipe and the die will change accordingly, and the longitudinal and lateral flow of the metal will be unbalanced, resulting in the The quality of circular tubes is poor, mainly manifested in its poor straightness (with different degrees of bending), uneven wall thickness, uneven fillet, unstable size and uneven surface, and even the drawing process. Medium steel pipe breakage and cracking phenomenon
[0004] At present, there is no uniform design standard for special-shaped tube calendering dies. The opening size and length of the inlet section are set based on experience. For each type of circular tube, the design must be repeated many times. Only through the process of testing, improving and re-testing can an ideal drawing die be obtained, which not only prolongs the processing cycle of the mold, but also increases the production cost
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[0019] A specific embodiment of a circular metal tube rolling die according to the present invention will be described in detail below with reference to the accompanying drawings.
[0020] Such as figure 1 with figure 2 As shown, a circular metal tube calendering die according to the present invention includes: an insert 1 and a mold core 2 arranged in the insert 1, the mold core 2 is provided with a calendering forming hole passing through the mold core, the calendering The forming hole includes: an inlet section 21, a sizing section 22 and an outlet section 23. One end of the insert 1 is provided with an opening for installing the mold core 2, and the mold core 2 is embedded in the insert 1 through the opening. Among them, the other end of the insert 1 is provided with an end wall 12, and the end wall 12 is provided with an outlet 121 matched with the calendering hole; the sizing section 22 is the outer diameter of the formed circular metal tube Corresponding cylindrical ...
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The invention discloses a drawing die for a square special-shaped pipe. All the relative parameters of an inlet section of the drawing die can be quantified. The drawing die comprises an insert bushing and a die core arranged in the insert bushing. A drawing forming hole is formed in the die core. The drawing forming hole comprises the inlet section and a fixed-diameter section. The fixed-diameter section is a cylindrical hole corresponding to the outer diameter of a round metal pipe. The diameter D1 of the fixed-diameter section is equal to the outer diameter of the round metal pipe. The length of the fixed-diameter section is 20.6-24.6% of the thickness L3 of the whole die core. The inlet section is an arc-shaped guiding hole which opens outwards. A guiding line on the inner surface of the arc-shaped guiding hole is a straight line which is overlapped with the center line of the drawing forming hole. The generatrix of the inner surface of the arc-shaped guiding hole is an arc. The drawing die is mainly used for drawing down the round metal pipe.
Description
technical field [0001] The invention relates to a calendering die in the technical field of metal plastic processing, in particular to a calendering die for reducing the diameter of a round steel pipe. Background technique [0002] Drawing dies (also known as calendering dies) are important tooling components for cold drawing various metal pipes, and have been widely used in the production process of diameter reduction or / and deformation of metal pipes such as steel pipes. The steel pipe is cold drawn and formed by using a drawing die, which has the characteristics of high material utilization rate, low energy consumption, excellent product performance, high production efficiency and low cost. Drawing dies can be divided into circular drawing dies and special-shaped drawing dies according to the cross-sectional shape of the drawn pipes; according to whether there is a lining mandrel in the drawing process, they can be divided into empty drawing and drawing dies. Die (referr...
Claims
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IPC IPC(8): B21C3/04
CPCB21C3/04
Inventor 韩畑州陈籽霖周金苗韩波
Owner JIANGSU HUACHENG IND PIPES