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Huaqiang, Director of the General Manager Office of Huzhou Machine Tool Works Co., Ltd.
High pressure forming technology in pipe fittings
Internal high pressure forming is a special forming in the field of metal stamping. The liquid pressure is used to shape the shaped pipe fittings in the preset cavity, which improves the strength and impact resistance of the parts, reduces the weight of the parts, and improves the competitiveness of the products.
The numerical control internal high pressure forming hydraulic press has a clamping force of 50,000 kN and a maximum pressure of 300 MPa of the supercharger, which fills the blank of domestic high pressure forming technology and equipment manufacturing. The main performance is: electro-hydraulic proportional control technology is adopted to realize synchronous pressing of left and right side cylinders, and the precision is controlled within 0.2mm; with pre-bending and pre-pressing function of pipe fittings; punching holes in inner high-pressure die; sealing of high-pressure liquid in pipe And control (patent pending).
The equipment is mainly used in automobile sub-frames, roof frames, transverse rails and exhaust pipes, and three-way interfaces in the petrochemical industry. It can reduce the number of molds, reduce mold costs, improve product quality, reduce product weight and reduce parts. The process of forming.
High-strength steel plate hot stamping forming hydraulic press
The technologies that the hydraulic press needs to study are:
1 The steel plate with a temperature of about 900 °C is rapidly formed in the hydraulic press mold and rapidly cooled to room temperature to achieve the purpose of strengthening quenching. 2 Sealing technology of sliding friction pair during rapid movement. 3 The generation of high-flow high-pressure working fluid in the case of fully reducing the power configuration. 4 large flow working liquid energy release control. 5 The mold is fully cooled to the corresponding structural design. 6 Control of slider positioning accuracy during fast motion. 7 High-speed hydraulic machine speed control, reasonable output pressure according to the size of the load. 8 Joint control with the loading and unloading robot.
The high-strength steel plate hot stamping forming hydraulic press (National 2010 major special project) part of the parameters: pressure 8000kN, slider stroke 1000mm, closing speed 700mm / s, work surface 3000mm × 2200mm, with high-speed movement of the material conveying mechanism. The fuselage adopts prestressed frame structure, side shifting table and upper power tank. Meet the application requirements of the stamping industry for ultra-high-strength steel parts. After hot forming, the strength of the steel plate can reach 1400MPa or more, and the weight loss and impact resistance are improved.
Fine punching hydraulic press
The characteristics of fine punching technology are:
1 When the fine punching is performed, the sheared surface is plastically deformed under the condition of three-direction compressive stress. 2 The precision of the inner shape of the fine punching can reach IT6~IT9, the dimensional accuracy can reach IT7~IT10; the hole pitch tolerance is generally 0.01~0.05mm, the surface roughness value of the shear surface is R a=0.4~1.6mm, shearing The surface is clean and complete, and the bright belt can reach the material thickness of 90%~100%. 3 The hydraulic press selected for fine punching is mainly “lower top†and requires strong anti-offset capability.
Advantages of fine punching technology:
1 parts have high dimensional accuracy. 2 The flatness and surface quality of the parts are high, and the disposable product has high productivity. 3 The work hardening phenomenon occurs during the fine punching process to improve the mechanical properties of the parts.
4 mass production, fine punch can reflect its economy. The disadvantage is that: 1 fine punching process has certain limitations on shape and material. 2 During the entire fine scouring process, the mold is subjected to high temperature and high pressure, and the working environment is bad. 3 Compared with ordinary blanking, the precision punching die has high precision and high manufacturing cost.
At present, the development direction of fine punching technology is:
1 Fine punching of high strength, thick plate and large parts. 2 fine punching composite process application. 3 multi-station continuous fine punching, can quickly load and unload the mold, realize single machine automation, so that no material is not washed, and the scrap is cleaned and then finely rushed. 4 high-efficiency, high-precision fine punching machine. 5 fine-punching hydraulic press with 5 forces.
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Zhejiang Philic Fluid Control Co.,LTD , https://www.philicflow.com