CN106077415A - A kind of Forging Technology of nuclear island spindle - Google Patents

Abstract

The invention discloses the Forging Technology of a kind of nuclear island spindle, comprise the following steps: (1) preheats.(2) being heated slowly to 1250 ~ 1280 DEG C, insulation 5 ~ 6 is little；(3) forging.(4) second time heating.(5) forging forming.(6) annealing immediately after finish-forging: be slowly warmed up to 950 ~ 980 DEG C and be incubated 5 ~ 8 hours, be raised again to 860 DEG C after cooling to 650 DEG C with stove, then by forging air cooling to room temperature.The Forging Technology of the nuclear island spindle of the present invention passes through jumping-up, pulling on the circular arc recessed swage block of dentation epirelief, and internal modification is uniform, it is possible to the ultrasonic examination reaching relevant requires and grain size requirement, it is ensured that the security reliability of nuclear island spindle.

Description

A kind of Forging Technology of nuclear island spindle

Technical field

The invention belongs to technical field of forging, particularly relate to the Forging Technology of a kind of nuclear island spindle.

Background technology

Along with developing rapidly of nuclear power industry, the manufacturing process of each key equipment in nuclear island is the most actively studied by China. Nuclear island spindle is as important composition parts in nuclear power station, and its safety is most important.How to improve the intensity of nuclear island spindle, toughness It is the problem that China core staff must solve with corrosion resistance.

Summary of the invention

The purpose of the present invention is in order to solve above-mentioned technical problem, it is provided that the Forging Technology of a kind of nuclear island spindle, and its feature exists In: include following operation:

1) blank steel ingot is put into the heating furnace that furnace temperature is 600 DEG C, preheat 3h；

2) the first fire: be heated slowly to 1250 ~ 1280 DEG C, be incubated 5 ~ 6 hours；

3) forging, carries out twice upsetting pull to the steel ingot after heating, it is ensured that the ratio of upsetting pull for the first time is: 1.3≤upsetting on 8MN hydraulic press Thick ratio≤1.5,1.1≤pulling ratio≤1.3, the ratio of upsetting pull for the second time is: 1.0≤upset ratio≤1.2,0.8≤pulling ratio≤1.0；

4) the second fire, heating-up temperature to 1050 ~ 1100 DEG C, be incubated 2 ~ 3 hours；

5) by the steel ingot of gained in step (4) on the circular arc recessed swage block of dentation epirelief jumping-up, be drawn into and meet the forging of size；

6) annealing immediately after finish-forging: be slowly warmed up to 950 ~ 980 DEG C and be incubated 5 ~ 8 hours, be raised again to after cooling to 650 DEG C with stove 860 DEG C, then by forging air cooling to room temperature；

The described circular arc recessed swage block of dentation epirelief, including upper swage block and lower swage block, upper swage block is that both sides conical surface projection sets to centre It is set to the arc convex surface of the two or more equal radii protruded, and smooth excessively by circular arc camber between adjacent circular arc convex surface, under Swage block is the arc convex surface that the V-type conical surface is recessed to that centre is arranged to the two or more equal radii of protrusion, adjacent arc convex surface Between smooth excessively by circular arc camber, also smooth excessively by circular arc camber between described arc convex surface and the V-type conical surface, described both sides Conical surface angle and V-type conical surface angle equal be all that α, α can change within the scope of 135 °～155 °.

Compared with prior art, the invention have the advantage that to have internal modification uniform, it is possible to the ultrasound wave reaching relevant is visited Wound requires and grain size requirement, and the intensity of forging, toughness and corrosion resistance are greatly improved.

Detailed description of the invention

Embodiment one

A kind of Forging Technology of nuclear island spindle, it is characterised in that: include following operation:

1) blank steel ingot is put into the heating furnace that furnace temperature is 600 DEG C, preheat 3h；

2) the first fire: be heated slowly to 1250 DEG C, be incubated 5 hours；

3) forging, carries out twice upsetting pull to the steel ingot after heating, it is ensured that the ratio of upsetting pull for the first time is: upset ratio on 8MN hydraulic press 1.35, pull out ratio 1, the ratio of upsetting pull for the second time is: 1.0, pulls out ratio 0.8；

4) the second fire, heating-up temperature to 1050 DEG C, be incubated 2 hours；

5) by the steel ingot of gained in step (4) on the circular arc recessed swage block of dentation epirelief jumping-up, be drawn into and meet the forging of size；

6) annealing immediately after finish-forging: be slowly warmed up to 950 DEG C and be incubated 5 hours, be raised again to 860 DEG C after cooling to 650 DEG C with stove, Then by forging air cooling to room temperature；

The described circular arc recessed swage block of dentation epirelief, including upper swage block and lower swage block, upper swage block is that both sides conical surface projection sets to centre It is set to the arc convex surface of the two or more equal radii protruded, and smooth excessively by circular arc camber between adjacent circular arc convex surface, under Swage block is the arc convex surface that the V-type conical surface is recessed to that centre is arranged to the two or more equal radii of protrusion, adjacent arc convex surface Between smooth excessively by circular arc camber, also smooth excessively by circular arc camber between described arc convex surface and the V-type conical surface, described both sides Conical surface angle and V-type conical surface angle equal be all α, α be 135 °.

Embodiment two

A kind of Forging Technology of nuclear island spindle, it is characterised in that: include following operation:

1) blank steel ingot is put into the heating furnace that furnace temperature is 600 DEG C, preheat 3h；

2) the first fire: be heated slowly to 1260 DEG C, be incubated 5.5 hours；

3) forging, carries out twice upsetting pull to the steel ingot after heating, it is ensured that the ratio of upsetting pull for the first time is: upset ratio on 8MN hydraulic press ≤ 1.4, pull out ratio 1.2, the ratio of upsetting pull for the second time is: upset ratio 1.1, pulls out ratio 0.9；

4) the second fire, heating-up temperature to 10909 DEG C, be incubated 2.5 hours；

5) by the steel ingot of gained in step (4) on the circular arc recessed swage block of dentation epirelief jumping-up, be drawn into and meet the forging of size；

6) annealing immediately after finish-forging: be slowly warmed up to 960 DEG C and be incubated 7 hours, be raised again to 860 DEG C after cooling to 650 DEG C with stove, Then by forging air cooling to room temperature；

The described circular arc recessed swage block of dentation epirelief, including upper swage block and lower swage block, upper swage block is that both sides conical surface projection sets to centre It is set to the arc convex surface of the two or more equal radii protruded, and smooth excessively by circular arc camber between adjacent circular arc convex surface, under Swage block is the arc convex surface that the V-type conical surface is recessed to that centre is arranged to the two or more equal radii of protrusion, adjacent arc convex surface Between smooth excessively by circular arc camber, also smooth excessively by circular arc camber between described arc convex surface and the V-type conical surface, described both sides Conical surface angle and V-type conical surface angle equal be all α, α be 145 °.

Embodiment three

A kind of Forging Technology of nuclear island spindle, it is characterised in that: include following operation:

1) blank steel ingot is put into the heating furnace that furnace temperature is 600 DEG C, preheat 3h；

2) the first fire: be heated slowly to 1280 DEG C, be incubated 6 hours；

3) forging, carries out twice upsetting pull to the steel ingot after heating, it is ensured that the ratio of upsetting pull for the first time is: upset ratio on 8MN hydraulic press 1.5, pull out ratio 1.3, the ratio of upsetting pull for the second time is: upset ratio 1.2, pulls out ratio 1.0；

4) the second fire, heating-up temperature to 1100 DEG C, be incubated 3 hours；

5) by the steel ingot of gained in step (4) on the circular arc recessed swage block of dentation epirelief jumping-up, be drawn into and meet the forging of size；

6) annealing immediately after finish-forging: be slowly warmed up to 980 DEG C and be incubated 8 hours, be raised again to 860 DEG C after cooling to 650 DEG C with stove, Then by forging air cooling to room temperature；

The described circular arc recessed swage block of dentation epirelief, including upper swage block and lower swage block, upper swage block is that both sides conical surface projection sets to centre It is set to the arc convex surface of the two or more equal radii protruded, and smooth excessively by circular arc camber between adjacent circular arc convex surface, under Swage block is the arc convex surface that the V-type conical surface is recessed to that centre is arranged to the two or more equal radii of protrusion, adjacent arc convex surface Between smooth excessively by circular arc camber, also smooth excessively by circular arc camber between described arc convex surface and the V-type conical surface, described both sides Conical surface angle and V-type conical surface angle equal be all α, α be 155 °.

Claims (1)

1. the Forging Technology of a nuclear island spindle, it is characterised in that: include following operation:

1) blank steel ingot is put into the heating furnace that furnace temperature is 600 DEG C, preheat 3h；

2) the first fire: be heated slowly to 1250 ~ 1280 DEG C, be incubated 5 ~ 6 hours；

3) forging, carries out twice upsetting pull to the steel ingot after heating, it is ensured that the ratio of upsetting pull for the first time is: 1.3≤upsetting on 8MN hydraulic press Thick ratio≤1.5,1.1≤pulling ratio≤1.3, the ratio of upsetting pull for the second time is: 1.0≤upset ratio≤1.2,0.8≤pulling ratio≤1.0；

Second fire, heating-up temperature to 1050 ~ 1100 DEG C, it is incubated 2 ~ 3 hours；

By the steel ingot of gained in step (4) on the circular arc recessed swage block of dentation epirelief jumping-up, be drawn into and meet the forging of size；

Annealing immediately after finish-forging: be slowly warmed up to 950 ~ 980 DEG C and be incubated 5 ~ 8 hours, be raised again to 860 after cooling to 650 DEG C with stove DEG C, then by forging air cooling to room temperature；

The described circular arc recessed swage block of dentation epirelief, including upper swage block and lower swage block, upper swage block is that both sides conical surface projection sets to centre It is set to the arc convex surface of the two or more equal radii protruded, and smooth excessively by circular arc camber between adjacent circular arc convex surface, under Swage block is the arc convex surface that the V-type conical surface is recessed to that centre is arranged to the two or more equal radii of protrusion, adjacent arc convex surface Between smooth excessively by circular arc camber, also smooth excessively by circular arc camber between described arc convex surface and the V-type conical surface, described both sides Conical surface angle and V-type conical surface angle equal be all that α, α can change within the scope of 135 °～155 °.