CN102247989A

CN102247989A - Production process for four-roll planetary hot-rolled tube machine

Info

Publication number: CN102247989A
Application number: CN2011101656175A
Authority: CN
Inventors: 吴军; 郑建国; 张国庆
Original assignee: TAIYUAN QINGHONG ELECTRONIC MACHINER CO Ltd
Current assignee: TAIYUAN QINGHONG ELECTRONIC MACHINER CO Ltd
Priority date: 2011-06-15
Filing date: 2011-06-15
Publication date: 2011-11-23

Abstract

The invention discloses a production process for a four-roll planetary hot-rolled tube machine, and belongs to the technical field of production processes of hot-rolled steel tubes. The process is characterized by comprising the following steps of: checking a tube billet; grinding; cutting to length, and loading into a heating furnace and heating to the punching temperature; feeding into a puncher and punching; pre-punching a mandril, and feeding into the four-roll planetary hot-rolled tube machine and rolling; feeding into a stretch-reducing mill unit and reducing; cutting to length; uniformly cooling; straightening; and performing flat-head chamfering, detecting flaws and inspecting. Compared with the prior art, the process has the advantages that: (1) secondary heating is reduced, and fuel, power consumption, the heating furnace and plant area are saved; (2) the length of rolled pierced billets can reach 50 meters, so that the loss caused by cutting heads and tails is reduced, and the yield is improved; and (3) the wall thickness of rolled tubes can reach 2.3mm, so that the bottleneck that the wall thickness of the rolled tubes cannot be less than 3mm in the prior art is broken through.

Description

A kind of production technology of four roller planet hot-rolled pipe machines

Technical field:

The invention belongs to the hot rolled seamless steel tube technical field of producing, be specifically related to a kind of production technology of four roller planet hot-rolled pipe units.

Technical background:

At present, what both at home and abroad hot rolled seamless steel tube adopted is Accll-Roll two rolling pipe units and Assel three roll pipe unit, and its technological process of production is: 1. pipe inspection and mill repair → 2. the pipe fixed ruler cutting → heating furnace of 3. pipe being packed into is heated to piercing temperature → 4. discharging, send into the punch perforation → 5. punching rod → 6. two rollers or three roll pipe unit tube rolling → 7. send into heating furnace carry out post bake → 8. crop on the end shear → 9. sizing on the sizing mill → 10. cooling on cold bed →

Aligning on straightener →

Back-end crop

→

Chamfered edge →

Flaw detection →

Check.

The shortcoming that exists in above-mentioned tube rolling production is: 1. Accll-Roll tube rolling unit is when the rolling thin-wall pipe, and the godet consumption is excessive, and is rolling just very difficult when D/S＞30, also very easily has an accident D-caliber, S-thickness of pipe wall; 2. be after roll is nipped the district, a convex shoulder to be arranged to the shortcoming that exists in the production of Assel tube rolling unit, the height value of convex shoulder is equivalent to wall thickness reducing amount, convex shoulder weares and teares very big in rolling, heat fatigue cracking gathers around it, give the rolling very big difficulty of bringing, and when D/S＞30, the trickle projection that produces on the tube wall is obvious, make the pipe internal surface poor quality, be difficult to reach the quality requirement of light-wall pipe; 3. prior art exists in tube rolling production and differs from two big bottleneck problems, and the one, rolling waste length of tube can't surpass 35 meters, and the 2nd, the tube rolling wall thickness can't be less than 4 millimeters.

At above-mentioned condition, the patent No. is that the patent that " ZL201020517121.0 ", name are called " four roller planet hot-rolled pipe machines " can overcome the shortcoming that prior art exists effectively, but its corresponding production technology waits research.

Summary of the invention:

The object of the invention just provides a kind of production technology of four roller planet hot-rolled pipe machines, to adapt to the production demand of four roller planet hot-rolled pipe machines.

The present invention is achieved in that and it is characterized in that the technological process of production is: 1. pipe inspection and mill repair → 2. the pipe fixed ruler cutting → heating furnace of 3. pipe being packed into be heated to the discharging of piercing temperature → 4. send into the hollow billet of punch perforation → 5. give punching rod → 6. enter four roller planet hot-rolled pipe units rolling → 7. enter the straightener aligning of stretch reducing unit tube reducing → 8. cut scale → 9. cold bed cooling → 10. → Tack, chamfered edge →

Flaw detection →

Check.

Advantage of the present invention compared with the prior art and good effect are:

1. in technological process, reduced post bake, saved fuel, electricity consumption, heat time heating time and firing equipment, plant area, also had workman's the amount of labour;

2. rolling waste length of tube can reach 50 meters, has both reduced the loss of crop end, has improved the recovery rate of finished product, and recovery rate can reach 97%;

3. the tube rolling pipe thickness can reach 2.3 millimeters, has broken through the prior art tube wall and can not be lower than 3 millimeters bottleneck problem.

Description of drawings:

Fig. 1 is a technological process layout drawing of the present invention:

1---rotary heating furnace 2---punch 3---four roller hot-rolled pipe machines among the figure

4---29 stretch reducing units 5---swinging flies saw

6---cold bed 7---straightener 8---chamfering machines

9---defect-detecting equipment 10---check-out console

The specific embodiment:

With the diameter is 160mm, and length is example for the 5m pipe:

1. pipe inspection and mill repair → 2. with pipe dress for annular furnace be heated to 1250 ℃ → 3. caliber is φ 165mm after punch is bored a hole, length is that to roll out caliber be φ 125mm to hollow billet → 4. the give punching rod → four roller hot-rolled pipe machines that 5. enter of 8m, length is 50m, pipe thickness be 3mm hollow forging → 6. enter 29 frames high tension tube reducing unit progressively reducing and rolling to go out caliber be φ 17.2mm, length is 800mm, wall thickness is that seamless steel pipe → 7. the enter Clothoid type of 2.3mm flies the flat head chamfering of the straightener aligning of sawing scale → 8. cold bed cooling → 9. → 10., flaw detection, ultrasonic inspection, check, the spray mark is beaten look and is weighed warehouse-in.

Claims

1. the production technology of a roller planet hot-rolled pipe machine is characterized in that technological process is: pipe is checked and grind repair → with pipe cut be heated in the scale → heating furnace of packing into piercing temperature → discharging, with blank send into the punch perforation → with hollow billet give punching rod → send into four roller planet hot-rolled pipe machine tube rollings → send into stretch reducing unit tube reducing → fixed ruler cutting → cold bed all cold → straightener aligning → flat head chamfering, flaw detection, check.