CN104493035A - Rotary swaging method for processing pull rods - Google Patents

Abstract

The invention provides a rotary swaging method for processing pull rods. The rotary swaging method includes the steps of 1, selecting a pipeline with great wall thickness and diameter as raw material, to be specific, with the cross sectional area of the raw material being greater than that of ends of the pull rods, and inner diameter of the raw material being greater than that of the middles of the pull rods; selecting a mandrel with diameter equal to the inner diameter of the middle of the pull rod; selecting a rotating swaging die with diameter equal to outer diameter of the middle of the pull rod; 2, inserting the mandrel into the pipeline with position in consistence with that of the middle of the pull rod, and subjecting the outside of the pipeline to cold rotary swaging for processing, thus the wall thickness of the middle is decreased and requirements on the inner and outer diameters of the parts are met; 3, subjecting two ends of the pull rod to the mandrel-free cold rotary swaging, accordingly reducing the diameters to obtain the shape and the size required by the pull rod. The rotary swaging method is convenient, simple, efficient and stable and allows non-chip cold working, accordingly remarkably improving comprehensive mechanical properties of the pull rod.

Description

By the method for processes pull rod type part of swaging

Technical field

The invention belongs to mechanical processing technique field.

Background technology

Aircraft pull bar is used for aircraft handling, and general shape is the reducing of pipe two ends, and material is generally aluminium or stainless steel.The feature of aircraft pull bar is generally: in the middle part of pipe, tube wall is thin, and reducing position, two ends tube wall is very thick, and wall thickness variation is large, and mid portion is thin is in order to loss of weight, and two ends are thick is need machining screw.As a typical part, the cross-sectional area of middle part material is less than the cross-sectional area of reducing end material.Require mid portion wall thickness 1mm, two ends wall thickness >4mm, external diameter 25mm in the middle part of part, two ends external diameter 16mm.Differ too large with end wall thickness in the middle part of part.

Under normal conditions, select wall thickness to equal the light-wall pipe of mid portion, after reducing is carried out at two ends, wall thickness can increase, but does not reach part requirements.Such as typical part described above, adopt the light-wall pipe of wall thickness 1mm, when external diameter tapers to 16mm from 25mm time, the wall thickness at two ends can only be increased to 1.7mm.According to traditional technique, this part mainly adopts the mode of hot extrusion to process.The light-wall pipe raw material selecting 1mm thick, then heat part (or mould), then from end hot extrusion, are shortened by material, make material stacking to end, thus increase wall thickness.But hot extrusion technique exists processing technology complexity, inefficiency, during hot-working, poor quality controls, and yield rate is low, and the shortcoming such as hot-working material property is not good.

How efficiently the problem to be solved in the present invention is, realizes the problem of the particular/special requirement (two ends reducing part, end wall thickness is much larger than middle part wall thickness) of aircraft pull rod type part with high reliability.

Summary of the invention

The object of this invention is to provide a kind of method by processes pull rod type part of swaging, the method is easy, efficient, stable, and chipless cold working can significantly improve the comprehensive mechanical performance of part.

Technical scheme of the present invention is: a kind of method by processes pull rod type part of swaging, comprises the following steps:

(1) first select the tubing that wall thickness, caliber are all larger as raw material, require that raw-material material cross-section amasss the material cross-section being greater than part end and amasss, and the internal diameter of mother tube is greater than the internal diameter in the middle part of part; Select a plug, its diameter equals the internal diameter in the middle part of part; Select one pair of mould of swaging, its diameter equals the external diameter in the middle part of part.

(2) plug is inserted the inside of raw material tubing, position consistency in the middle part of its position and part, then the cold technique of swaging of outside employing is processed, make the wall thickness reduction at middle part, reach the inside/outside diameter size requirement of part, simultaneously the wall thickness at raw material two ends and size all constant, then plug is taken out.

(3) adopt the cold processing of swaging without plug respectively at the two ends of part, the appearance and size needed for tube reducing to part of being swaged at raw material two ends because raw-material wall thickness is thicker, therefore now two ends shaping after material wall thickness naturally reach requirement.

Advantage of the present invention:

1, efficiency is high, adopts cold technique of swaging, only needs three process, and every procedure only needs general 20 seconds, does not also need extra time.And the hot extrusion technique adopted at present, only heating mould just needs more than 2 hours.

2, easy to process, without the need to devices such as heating, adopt raw material directly to process, and automation degree of equipment is high.

3, accessory size is controlled well, finds in practice, when adopting hot extrusion technique, and the size of part and the bad control of uniformity, and there is not these problems in cold swaging.

4, part performance is improved, because cold the swage flow harden that causes and high frequency forge, the crystal grain of material is smashed, formative tissue fiber, the part that the comprehensive mechanical performance such as intensity, resistance to torsion, pull resistance of cold working out part is gone out compared with hot-working obviously promotes.

Accompanying drawing explanation

Fig. 1 is raw material schematic diagram.

Fig. 2 subtracts wall process schematic representation.

Fig. 3 is bottling technique schematic diagram.

Fig. 4 is finished product schematic diagram.

Detailed description of the invention

Below in conjunction with example, the present invention will be further described, and the shape of a typical aircraft pull bar part as shown in Figure 4.Material is stainless steel, mid portion wall thickness 1mm, two ends wall thickness >4mm, external diameter 25mm in the middle part of part, two ends external diameter 16mm.

Process by technique of swaging below, comprise the following steps:

1, wall thickness, raw material that caliber is larger are adopted.For above-mentioned part, we select external diameter 28mm, the light-wall pipe of wall thickness 2mm, as shown in Figure 1.

2, inserting diameter is the core bar of 23mm, then in the middle part of cold raw material of swaging, makes its reduced outer diameter be 25mm, and internal diameter ensures as 23mm simultaneously.That is, reduced by 2mm by the middle part wall thickness of material and become 1mm, material extends, and meanwhile, inside/outside diameter size also all reaches requirement, as shown in Figure 2.

3, swager is adopted at two ends to carry out necking forming respectively, as shown in Figure 3.

4, swage shaping after, two ends wall thickness reaches 4.5mm, meets the requirement of part, as shown in Figure 4.

The present invention is applicable to each metalloid materials such as aluminium, aluminium alloy, stainless steel, carbon steel, titanium, titanium alloy, the shape of pull bar is the tubing of two ends reducing, and midfeather is thin, two ends reducing place wall thickness, the material cross-section at both ends amasss the cross-sectional area being greater than middle part material.

Claims (1)

1., by the method for processes pull rod type part of swaging, it is characterized in that: comprise the following steps:

(1) first select the tubing that wall thickness, caliber are all larger as raw material, require that raw-material material cross-section amasss the material cross-section being greater than part end and amasss, and the internal diameter of mother tube is greater than the internal diameter in the middle part of part; Select a plug, its diameter equals the internal diameter in the middle part of part; Select one pair of mould of swaging, its diameter equals the external diameter in the middle part of part;

(2) plug is inserted the inside of raw material tubing, position consistency in the middle part of its position and part, then the cold technique of swaging of outside employing is processed, make the wall thickness reduction at middle part, reach the inside/outside diameter size requirement of part, simultaneously the wall thickness at raw material two ends and size all constant, then plug is taken out;

(3) adopt the cold processing of swaging without plug respectively at the two ends of part, the appearance and size needed for tube reducing to part of being swaged at raw material two ends because raw-material wall thickness is thicker, therefore now two ends shaping after material wall thickness naturally reach requirement.