Clamping anti-skid rigid supporting method of small cold-drawing T-drill steel pipe and clamp

Abstract

The invention relates to a clamping anti-skid rigid supporting method of a small cold-drawing T-drill steel pipe and a clamp. The Half clamp surrounds and clamps a steel pipe (C) through a clamping inner hole (D), a 100% circumferential clamping structure for the steel pipe (C) is arranged on the Half clamp, the Half clamp controls a supporting face (E), an axial upper vertical face (F), a pipe side vertical face (G), an axial bottom vertical face (H) and a bottom side clamping vertical face (P) of the Half clamp to achieve multi-directional control composite plane positioning of a T-drill supporting plate (1) and the steel pipe (C) so as to rigidly support the T-drill supporting plate (1), a top supporting surface (E) of the Half clamp makes contact with the bottom plane of the T-drill supporting plate (1) and the bottom plane (S) of a connecting plate to realize plane supporting, and a bottom clamping force is applied in combination with a bench vice. A combined rigid structure provides a circumferential clamping contact surface for the outer wall of the steel pipe, the rigidity of a clamp clamping structure is effectively improved, the 100% circumferential clamping structure forthe steel pipe C is obtained, the position stability of the T-drill during machining is accurately kept, the yield of cold-drawing tee joints is 100%, and the clamp is particularly suitable for machining the medium-small-caliber high-precision cold-drawing tee joints.

Description

technical field [0001] The invention belongs to IPC classification B21C1 / 00, which basically uses drawing method to manufacture metal pipes without cutting, and specifically relates to a steel pipe clamping method and its fixture technology, especially a steel pipe clamping anti-slip rigid support method of a small cold-drawn tee machine and fixtures. Background technique [0002] Portable cold drawn tee machine, referred to as tee machine, is an electric tool used for drawing tees in small batches of thin-walled steel pipes with a wall thickness less than 2mm. The tee machine needs to be effectively connected to the steel pipe through the support plate and the steel pipe clamping fixture. It will not work until fixed and clamped. [0003] There are few related published patent documents. [0004] Keyue Engineering (Suzhou) Co., Ltd. disclosed a fixing device for small-diameter cold-drawn tee machines in Chinese patent application 201721825069.3, aiming to solve the proble...

AI Technical Summary

Problems solved by technology

[0008] In the existing chain method, due to the inherent flexibility of the chain structure itself, when the reaction force is large, the clamping force is insufficient and the stability is poor during the application process.

In the pipe clamp method, although this Huff pipe clamp is intended to realize a rigid pipe clamp structure, because the tooling combination structure clamps the steel pipe only at the local pipe clamp method parts at both ends of the support plate, the effective contact in the circumferential direction is insufficient. 30%, the support plate only directly contacts and clamps with the steel pipe through the V-shaped structure at the bottom, and the contact area is small and the rigidity is poor. At the same time, the clamping force of this clamp should not be too large, otherwise the steel pipe C will be deformed by compression, and there is also clamping Insufficient force, long clamping length and poor stability

[0010] 1) Easy to slide: After the support plate is fixed and clamped on the steel pipe by chains or Huff pipe clamps, when the tee machine is placed on the support plate to work, due to the large reaction force of drilling, pulling, and milling, the two methods The clamping force is small, and the friction force generated is limited. The support plate will slide in the axial and circumferential directions on the steel pipe, so that the working position of the tee machine will change, so that the axial position and circumferential position of the pulled out tee There is a deviation, and the position accuracy is not enough;

[0011] 2) Poor rigidity: Due to the flexible connection of the chain and the structure of the Huff pipe clamp, the rigidity of these two methods is relatively poor. The size and shape of the branch pipe exceed the deviation requirements, and the end face of the milled branch pipe is uneven, which is not conducive to the subsequent process - welding;

[0012] 3) Limitation: The existing two methods are only suitable for pipes with a certain length of straight pipes on both sides of the position where the tee branch is drawn, and are neither suitable for such figure 1 The situation where branch pipes 5 with different diameters are densely distributed in the main pipe 5 is also not applicable to such as figure 2 The branch pipe shown is located at the bend or near the bend, and the existing methods cannot realize the cold-drawn tee processing of these structures

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