Upsetting and extruding precision die-forging forming method for large titanium alloy deep tube parts

Abstract

The invention discloses an upsetting and extruding precision die-forging forming method for large titanium alloy deep tube parts. The method includes that: firstly, enabling draft of a tube body die to range from 1 degree to 3 degrees, enabling the outer diameter of a blank to be 50% to 98% of that of a die tube body, enabling the height of the blank to be 60% to 150% of that of the tube body; spraying a protective lubricating layer with thickness ranging from 0.2mm to 3mm on the blank; heating the blank in an electric furnace under 5 DEG C to 50 DEG C of the temperature phase-transition point (alpha +beta / beta), enabling the heating coefficient to be larger than or equal to 0.6 min / mm, simultaneously preheating the die for 6h to 24h at a temperature ranging from 200 DEG C to 450 DEG C; finally, installing the die on a pressure machine, a die forging hammer or a counter-blow hammer, and forging the diathermal blank inside a die cavity. The upsetting and extruding precision die-forging forming method for producing the large titanium alloy deep tube parts is simple in procedure operation, stable and reliable in performance, and is easy to control quantity and to realize large-batch industrialized production of products.

Description

technical field [0001] The invention belongs to the field of thermal processing and forming of metal materials, and relates to a forming method of a titanium alloy deep cylinder, in particular to an upsetting and extrusion precision die forging forming method of a large titanium alloy deep cylinder. Background technique [0002] The so-called large titanium alloy deep cylinder refers to a cylinder with an inner diameter (d) greater than 160mm, an outer diameter (D) greater than 200mm, a height (H) greater than 200mm, and H / D≥1, h(h1+h2) / d≥1 type rotary components, the main product shape see Figure 1-1 to Figure 1-4 . [0003] Large titanium alloy deep tube parts are widely used in aviation, aerospace, navigation, chemical industry and other fields, but because titanium alloy is a rare and difficult-to-machine metal material, the forming problem of large titanium alloy deep tube parts is currently faced by many manufacturers A major technical problem. There are currently t...

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Problems solved by technology

[0004] The first method is directly machined from large-scale bar stock. This method has the disadvantages of low material utilization rate and high production cost in the production of large-scale titanium alloy deep tube parts, and because the product flow line is cut off during the machining process. Product performance is low

[0005] The second method is to use casting technology to produce large titanium alloy deep cylinder parts. Due to many casting defects and low mechanical properties, the large titanium alloy deep cylinder parts can only be used in some occasions with relatively low requirements, and cannot meet the requirements of aviation. , aerospace and other high-end industrial sectors

[0007] ①. The reverse extrusion molding technology of the extruder belongs to the one-time, one-time molding method. After the extrusion deformation is completed, the product specification and size are often unqualified and cannot be refurbished, which directly leads to product scrapping and low product qualification rate.

[0008] ②. Due to the static pressure forming of the reverse extrusion molding technology of the extruder, the lower mold cavity and the upper punch are always in contact with the hot billet during the entire molding process, resulting in a sharp drop in the surface temperature of the billet and the characteristics of titanium alloy sticky molds, etc., thus During the deformation process, cracks are formed on the inner and outer surfaces of the shell. If the lubrication conditions are not good, the cracks are too deep and exceed the machining allowance at this place, which will cause the product to be scrapped.

[0009] ③. In the reverse extrusion molding technology of the extruder, the billet is in constant contact with the mold during the extrusion process, so the billet is easy to lock the upper punch, it is difficult to demould, the production efficiency is low, and even the billet or the punch is scrapped.

This will cause: after machining, the product streamlines cannot be completely distributed according to the shape, and some parts will be cut off by machine, resulting in the reduction of the performance and life of the final parts; in addition, it will cause disadvantages such as low material utilization rate and high production cost.

[0011] ⑤. Extruder reverse extrusion molding technology has high requirements on billet and mold lubrication, poor process stability and complicated process operation, which is not suitable for mass production and industrial production

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