Flat squeezing barrel for eliminating concentrated stress of inner barrel and manufacturing method for flat squeezing barrel

A stress-concentrated, flat extrusion cylinder technology, used in metal extrusion, manufacturing tools, containers to be extruded, etc., can solve the problems of high local stress, damaged inserts, cracks in the middle cylinder and inner cylinder, etc. Effects of stress concentration relief, stress level reduction, good fluidity

Active Publication Date: 2014-07-23
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The upper and lower inserts are fixed on the ring of the inner cylinder by countersunk bolts, and the concentrated internal stress is transmitted to the ring of the inner cylinder more evenly, thereby reducing the stress peak value of the dangerous section; but due to processing errors and high temperature, high pressure, high In the harsh working environment such as friction, there will be a gap between the two inserts, and the extruded metal will fill the gap during work, damaging the insert and the middle barrel. At the same time, stress concentration will also occur at the thread of the inner barrel. In the case of periodic loading It is also easier to cause damage
[0006] The above-mentioned flat extruded barrel structure inevitably stress concentration at the transition fillet; under the high temperature and high pressure service environment, the average stress level of the inner barrel is close to the yield stress, and due to the influence of stress integration, the local stress is very high, which is easy to exceed the allowable Stress, causing the inner cylinder to crack in a short time
At present, the service life of the above-mentioned flat extrusion barrels is difficult to meet the industrial needs

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  • Flat squeezing barrel for eliminating concentrated stress of inner barrel and manufacturing method for flat squeezing barrel
  • Flat squeezing barrel for eliminating concentrated stress of inner barrel and manufacturing method for flat squeezing barrel
  • Flat squeezing barrel for eliminating concentrated stress of inner barrel and manufacturing method for flat squeezing barrel

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[0022] In order to make the above-mentioned objectives, features and advantages of the present invention more clearly expressed, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] The schematic diagram of the embodiment of the flat extrusion cylinder proposed by the present invention is as follows Figure 4 with Figure 5 Shown. It is composed of an outer cylinder 401, a middle cylinder 402, a soft metal layer 403, and an inner cylinder 404; the outer cylinder 401 and the middle cylinder 402 adopt interference assembly; the inner cylinder 404 and the middle cylinder 402 contain a layer of soft metal with varying thickness Layer 403; the soft metal layer 403 is enclosed in a closed cavity by interference fit at both ends, such as Figure 5 The marked part.

[0024] The manufacturing process is as follows: the outer cylinder 401 and the middle cylinder 402 can be forged or ring-rolled blanks, proces

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Abstract

The invention discloses a flat squeezing barrel for eliminating concentrated stress of an inner barrel and a manufacturing method for the flat squeezing barrel. The flat squeezing barrel consists of an outer barrel (401), a middle barrel (402), a soft metal layer (403) and the inner barrel (404), wherein the outer barrel (401) and the middle barrel (402) are in interference fit; a thickness-variable soft metal layer (403) is arranged between the inner barrel (404) and the middle barrel (402); the soft metal layer (403) is sealed in a closed cavity by two ends in an interference fit manner. The manufacturing method comprises the steps of manufacturing blanks of the outer barrel (401) and the middle barrel (402) through forging or ring rolling, performing processing through a large-size lathe, and assembling the outer barrel and the middle barrel by a hot assembling technology; casting the soft metal layer in the cavity formed in the inner barrel to guarantee the compactness of soft metal casting; after casting is finished, processing an inner cavity of the inner barrel (404) through a numerical control machine tool, and processing the outer diameter of the inner barrel through cooperative processing so as to meet the requirement on interference amounts of sealing parts at two ends. The service life of the whole flat squeezing barrel can be effectively prolonged.

Description

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Claims

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Application Information

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Owner CHONGQING UNIV
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