CN1022495C - Heat treatment strengthening tech. for the metal material of shuttle clamp - Google Patents

Abstract

The present invention relates to a material used for a shuttle clamp and a shuttle shell in a carrier loom and strengthening technology of heat treatment. The service life of a produced shuttle clamp is as high as more than 10000000 times, and the holding force at the tip of the shuttle clamp is more than 1.9kg. The used raw material and the technology are suitable for the national condition in China and can be also applied to plants which use and produce Sutaiyi carrier looms.

Description

Heat treatment strengthening tech. for the metal material of shuttle clamp

The invention belongs to the Metallic Materials and Heat Treatment field.

Projectile shuttle in the gripper shuttle loom is made up of the bobbin case of shuttle folder and outside, becomes one through two little pin riveted joints.The inner shuttle folder of the major decision in work-ing life of projectile shuttle, the groundwork of shuttle folder partly is two symmetric arms, open under the effect of hook on the loom right side during work, two arms are opened and closed clamp weft yarn, when projectile shuttle was invested opposite side, the hook of opening in left side was opened two arms once more, and weft yarn spues, be projectile shuttle when finishing a wefting insertion, twice of two arm folding.So it is dangerous work section that two arm roots bear maximum moment of flexure.As the A place of Fig. 1, in order to clamp weft yarn, the tip of shuttle folder should keep the holding force of 1.9-2kg, the C place among Fig. 1, so require two arms that enough intensity should be arranged, and holding force must not be less than 1.9 kgfs during with maintenance work 1,000 ten thousand times.Clamp weft yarn when shuttle and back and forth during quick travel, can produce big frictional force on loom, weft yarn can make yarn clipping face grind groove, therefore requires yarn clipping face that enough hardness will be arranged, otherwise can make shuttle can't clip yarn and lost efficacy.Some units of current China are developed projectile shuttle work-ing life is 2,000,000 times, and being used to make shuttle folder material is 50GrV and 45CrNiMoV, and its forming technology is: machine adds → 840 ℃ of quenchings of thermal treatment, and 420 ℃ of tempering → machines add → secondary processing → shot-peening.Shuttle folder with this material and craftwork manufacture exists the weak point in work-ing life, and about 2,000,000 times, shuttle jig arm root insufficient strength, the stress relaxation of shuttle jig arm is lower than 1.9 kilograms, occurs minor groove on the yarn clipping face and causes the shuttle folder to be scrapped.Switzerland's manufacturing shuttle folder is 55Cr4MoVNi(Germany grade of steel 45CrMoV67 with material in the world), the bobbin case material is 55SiCr(Germany grade of steel 67SiCr5), these materials are comparatively expensive, are not suitable for the national conditions of China.

Purpose of the present invention is developed for anxious problem to be solved in greatly developing at the current textile industry of above-mentioned situation and China, in recent years China from Switzerland and other country altogether import more than 1000 gripper shuttle loom, China is upgrading old-fashioned textile manufacturing machine, and producing high-quality projectile shuttle is a great problem.

Main points of the present invention are to be 0.3-0.72%C with Chemical Composition, 0.2-0.8%Si, 0.4-1.0%Mn, 0.1-0.3%Ni, 0.9-3.0%Cr, 0.4-1.5%Mo, the steel shuttle folder of 0.1-0.9%V carries out the highly malleablized heat treatment process by following processing method, grain refining: after shuttle folder base forges, be heated 900-950 ℃, be incubated 3 hours, furnace cooling; Carry out modifier treatment after the roughing: be heated to 850-900 ℃ of oil cooling, 500 ℃ of tempering; Carry out removing the first time stress annealing after work in-process corase grind: temperature is 200-400 ℃ and to be incubated two hours stoves cold; After boring and correct grinding, carry out removing second time stress annealing: being heated to 200-400 ℃ this moment in protective atmosphere, to be incubated two hours stoves cold; After the machine-shaping of shuttle folder, carry out the complete heat treatment of shuttle folder; Carrying out ionitriding then handles: insulation is 4 hours in the time of Heating temperature 400-580 ℃, and stove is as cold as below 200 ℃ and comes out of the stove; Carrying out shot peening strengthening again handles: shot peening strength is the A level; At last partial heat treatment is carried out at shuttle folder tip: be heated to 1000-1200 ℃ of air cooling.

Shuttle jig arm cross section is very little, but bears especially root of higher load, therefore requires to use suitable metallic substance.Carbon content is in order to guarantee enough intensity and elasticity, contain chromium to be in order to increase hardening capacity, to reduce quenching strain and internal stress in the steel of above-mentioned use, and improves the hardness of nitrided case.The content of molybdenum is also more in the steel, and this can prevent temper brittleness, increases resistance to tempering, also can increase the hardness of nitrided case.But contain the vanadium crystal grain thinning, the effect of nickel is similar to chromium.

Shuttle folder is the key part of projectile shuttle, in order to obtain snappiness and high strength, and keeps the high life (1 * 10 ⁷Inferior) time, the holding force of yarn clipping face must not be lower than 1.9 kilograms.Therefore heat treated quenching and tempering will be protected the shuttle clamp surface; must not damage because of heat treated quenching and tempering; ion nitriding subsequently can make workpiece surface form suitable stress, obtains high fatigue lifetime, and the nitrogenize layer depth is advisable between 0.05～0.25mm.Surface hardness is in HV950～1200.Have between work in-process that to remove stress annealing several times be to avoid occurring in the processing distortion, working hardening and local strengthening are in order to increase bulk strength and most advanced and sophisticated wear resistance, heat treated core is except that guaranteeing that shuttle accompanies the enough intensity and elasticity, the more important thing is after thermal treatment to maintain enough holding forces, scope is at the 1.9-2.1 kilogram.

China introduces 1150 gripper shuttle looms, and because of the wide difference of (moulding) web of weaving cotton cloth, every machine wears 11～20 projectile shuttle, with on average every join 15 calculating, every 130 dollars, then:

Annual 1150 * 15 * 130=2242500 dollar of saving

The data of fatigue life of table 1 shuttle folder

Test surpasses 10 ⁷Inferior

Qualification rate remarks date of test (defective reason)

The number of packages number of packages

First processing in November 15 5 33% in 84 year is improper, and thermal treatment is improper

Second batch 85 year February 14 13 blemisher because of a defective is arranged in the material

The 3rd batch of 85 year April 15 15 100%

The 4th batch of 86 year March 15 15 100%

The 5th batch of 86 year May 15 15 100%

The 6th crowd of 86.6-11 11 100% be first woollen mill in Tianjin

87.6 it is all qualified to test

Table 1 is front and back six batches of shuttle folders data of fatigue life

If annual later on 200 of the homemade gripper shuttle looms of producing are worn 12 projectile shuttles for every, then: 200 * 12 * 130=312000 dollar.Two portions addition then be can be country every year save 2,600,000 dollars of foreign exchanges.

Fig. 1 is a shuttle clamping structure synoptic diagram.

Embodiment:

Fetch and forge 880 ℃ of air coolings of good shuttle folder blank material → be heated to; with 580 ± 10 ℃ of tempering → machines of 870 ± 10 ℃ of oil coolings of crystal grain thinning → modifier treatment add → 300 ℃ of stress relief annealing → machines add → stress relief annealing → machine adds → 900 ± 10 ℃ in protective atmosphere, heat oil cooling; 550 ℃ of tempering → machines add → 520 ± 10 ℃ of ion nitridings 3 hours; to time below 250 ℃ come out of the stove → carry out surface deformation strengthening with the shot-peening method, shot peening strength is the most advanced and sophisticated Local treatment of A level → 1000～1200 ℃ air cooling.

Shuttle folder through above-mentioned processing can reach 1 * 10 ⁷Inferior fatigue lifetime, and yarn clipping power is in the scope of 1.9～2.1kgf.

Claims (1)

1, a kind of Chemical Composition is 0.3-0.72% ℃, 0.2-0.8%Si, 0.4-1.0%Mn, 0.1-0.3%Ni, 0.9-3.0%Cr, 0.4-1.5%Mo, the thermal treatment strength-toughening process of the steel shuttle folder of 0.1-0.9%V is characterized in that comprising that processing step is as follows: grain refining: after shuttle folder base forges, be heated 850-950 ℃, be incubated 3 hours, furnace cooling; Carry out modifier treatment after the roughing: be heated to 850-900 ℃ of oil cooling, 500 ℃ of tempering; Carry out removing the first time stress annealing after work in-process corase grind: temperature is 200-400 ℃ and to be incubated 2 hours stoves cold; Boring and precision grinding process after, carry out the second removal stress annealing: this moment in protective atmosphere, be heated to 200-400 ℃ the insulation 2 hours stoves cold; After the machine-shaping of rib folder, carry out the complete heat treatment of shuttle folder; Carrying out ionitriding then handles: Heating temperature is 400-580 ℃ of insulation 4 hours, and stove is as cold as below 200 ℃ and comes out of the stove; Carrying out shot peening strengthening again handles: shot peening strength is the A level; At last partial heat treatment is carried out at shuttle folder tip: be heated to 1000-1200 ℃ of air cooling.

Images