Method for achieving staggered reverse spinning of pairs of wheels
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A technology of reverse spinning and staggered distance, applied in the field of spinning manufacturing, it can solve the problems of deformation instability and unbalanced spinning force, and achieve the effects of consistent deformation rate, avoiding deformation instability and high single-pass deformation.
Active Publication Date: 2018-06-08
XIAN AEROSPACEMOTOR MACHINE FACTORY
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[0006] In order to overcome the disadvantages of unbalanced spinning pressure and deformation instability existing in the prior art, the present invention proposes a method of counter-spinning with staggered wheel pitch
Method used
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Embodiment 1
[0064] The staggered pitch spinning of the opposite wheels requires 2 to 4 sets of opposite wheels. n is the number of pairs of wheels, n=2~4
[0065] In this embodiment, two pairs of wheel staggered pitch spinning methods are used to process large-diameter thin-walled cylindrical parts. The concrete process of this embodiment is:
[0066] Step 1: Prepare spinning blank.
[0067] Preparation of spinning blanks for thin-walled cylindrical parts. The spinning blank is a cylindrical part of 3A21 aluminum alloy, and the wall thickness of the blank is t 0 =14mm, inner diameter D=400mm.
[0068] Step 2: Heating the spinning blank.
[0069] Before spinning, place the spinning blank in a circulating box-type heating furnace and heat it to 250°C to make the temperature of the inner and outer layers of the spinning blank uniform. Since a large amount of deformation heat will be generated during the spinning process, in order to avoid defects such as grain growth and instability ca...
Embodiment 2
[0106] In this embodiment, three pairs of wheel staggered pitch spinning methods are used to process large-diameter thin-walled cylindrical parts.
[0107] The concrete process of this embodiment is:
[0108] Step 1: Prepare a spinning blank of a thin-walled cylindrical part.
[0109] Prepare spinning blanks for 20# steel cylinders. Blank wall thickness t 0 =10mm, inner diameter D=450mm;
[0110] Step 2: Heating the spinning blank.
[0111] Before spinning, place the spinning blank in a circulating box-type heating furnace and heat it to 250°C to make the temperature of the inner and outer layers of the spinning blank uniform;
[0112] Step 3: Install the spinning blank.
[0113] During installation, the faceplate of the main shaft of the spinning machine tool is mounted on one end of the spinning blank so that one end of the spinning blank is a fixed end and the other end is a free end. Take the free end as the spin end.
[0114] The spindle speed is set to 120r / min, a...
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Abstract
The invention discloses a method for achieving staggered reverse spinning of pairs of wheels. According to the method, 2-4 pairs of spinning wheels are adopted, and the parameters including angles ofattack, working circular angles and receding angles of each pair of spinning wheels are equal; in each pair of spinning wheels, the distance between each workblank axis and a central point of a connection line between the center of the inward spinning wheel and the center of the outward spinning wheel is equal. By means of the method, the stress center of each workblank in the radial direction ispositioned at the circumference with the same radius, distortion of the workblanks due to deviated loading of a spinning force is avoided, the deformation rates of materials are unified, the materialscan flow stably, the surfaces of cylinders on which the wheels spin are smooth, and a stacking defect is avoided. Compared with traditional die spinning, spinning of the pairs of wheels has the advantages that the workblanks are processed by the inward spinning wheels and the outward spinning wheels at the same time separately, and the machining efficiency is improved. The machining efficiency ofspinning of the pairs of wheels is improved, the problems that flowing of the materials processed in staggered reverse spinning of the pairs of wheels is unstable and the spinning force is unbalancedcan be effectively solved, and the machining efficiency of spinning of the pairs of wheels can be further improved.
Description
technical field [0001] The invention relates to the spinning manufacturing industry, in particular to a stagger adjustment method belonging to the wheel spinning process. Background technique [0002] The counter-wheel spinning method is a coreless spinning technology, which is developed on the basis of strong spinning. The traditional mandrel is replaced by a rotary wheel, and a pair or several pairs of rotary wheels are used to process the inner and outer surfaces of the blank at the same time. Thinned so that it elongates into a thin-walled cylindrical part. Compared with the molded spinning forming process, the wheel spinning can flexibly form cylinders with different diameters within the processing range of the equipment. Since there is no need for molds, the cost of making molds is saved. When processing a cylinder with a diameter greater than φ2500mm, it is very difficult to use die spinning, and the wheel spinning method has unique advantages in processing large di...
Claims
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