The swaging of the ends of the pipes

 

(57) Abstract:

The invention relates to pipe manufacture and can be used in the implementation process of thermo-mechanical processing of tubes in line with the reduction and sizing mills. The device comprises a deforming tool in the form of an annular matrix 2 installed in the housing 1. On the side surface of the matrix is performed through holes 7, which are wedges 3 deformed by the inclined surface. Associated with the power cylinder 5 of the pusher 4, the surface of which is made of longitudinal grooves 15, passes through the socket hole of the matrix. The cross section of the plunger corresponds to the smallest flow cross-section of the matrix. 2 Il.

The invention relates to pipe manufacture and can be used in the implementation process of thermo-mechanical processing of tubes in line with the reduction and sizing mills.

The known device for crimping the ends of the tubes containing the deforming tool, consisting of a matrix and a punch [1,2]

The disadvantage of these devices is the length of the process, therefore they cannot be used in production lines of p which is a device for preparing pipe ends for drawing [4] was adopted as a prototype and containing mounted in the housing of the tool, comprising a ring matrix and rigidly connected with the housing of the power cylinder, the piston rod which is fixed coaxially to the matrix of the plunger, the cross section of which corresponds to the smallest flow cross-section of the tool.

The processing of the ends of the tubes in this unit includes the steps of: feeding tubes into the device, the centering and fixing axis, the idle movement of the tool, the compression end by using the efforts of the cylinder, the exhaust of the working tool and return it to the operating position. These operations require considerable time from 30-40 per cycle, while the rate of rent in the line of high-performance tube Assembly with a continuous mill is 4-5 tubes per minute.

The objective of the invention is the reduction of time compression for the proposed use of the device in production lines of high-performance tube mills.

This is solved in that in the known device, containing mounted in the housing, the tool comprising a ring matrix and rigidly connected with the housing of the power cylinder, the piston rod which is fixed coaxially to the matrix of the plunger, the cross section of which corresponds to the lowest passing deforming surface, the matrix is a through radial grooves that have wedges and the pusher are made of longitudinal grooves.

In Fig. 1 shows the proposed device for crimping the ends of the pipe; Fig. 2 shows a cross section a-a of the pusher and the ring of the matrix.

The swaging of the ends of the pipes includes a housing 1, which is installed inside a deforming tool, made in the form of an annular matrix 2, provided with wedges 3, and is fixed coaxially to the matrix of the pusher 4, associated with the power cylinder 5, is rigidly fixed to the housing. Wedges 3 with an inclined deforming surface 6 mounted in the longitudinal through hole 7 on the side surface of the circular matrix 2. The base of the wedges 3 rests on the inner surface of the Cup 8, placed in a sleeve 9, which is attached to the chassis through the receiving hopper 10. In the liner installed thrust washer 11 and the cover 12 with bearings 13 and 14.

The cross section of the plunger 4 with the slots 15 corresponds to the smallest flow cross-section of the ring matrix with 2 wedges 3. The length of the slots is equal to the piston stroke of the power cylinder 5 provides the ejection pipe 16 from the device for receiving hopper 10.

In ishadi is located behind the glass 8.

The proposed device for crimping the ends of the pipes tested in the shop T-3 OJSC "Sinarsky pipe plant for production of heat-treated tubing diameter h,5 mm of steel GS using the heat rolling heat.

The device is placed in the stop (case 1), established at the end of one of the transport roller table in front of the reducing mill. Draft tube along the conveyor transport speed (up to 5 m/s), is set in the device. The pipe end is centered by the admissions funnel 10 and then when netgenie on an inclined surface 6 wedges 3 is the compression of the front end section of the draft tube. Bearing surface of the wedges is much wider deforming part and is prevented from turning in the hole 7 of the inner surface of the Cup 8 and the outer surface of the ring matrix 2.

After stopping pipes included, the compressed air in the pneumatic cylinder 5, which, acting on the plunger 4, centered bearings 13 and 14, pushes the pipe 16 from the device for receiving hopper 10. Then the pipe is discharged from the conveyor, the pusher 4 cylinder 5 is returned to its original extreme right position and the device is ready 5-8 C. This allows you to use the device for crimping the ends of the pipe line tube Assembly, without reducing its performance. The speed of transportation of the pipe 3-4 m/s when tilted deforming the surface of the wedges 3-9aboutit was enough to compress the front end section of the draft tube diameter h,5 mm reduced free clearance by 30-35% in the subsequent deformation in the reducing mill (hood 1,2) reduces clear opening up to 90-95%

Compression of the front end portion of the draft tube was carried out for the prevention (reduction) of water inside the finishing of the pipe in the process of the heat pipe, carried out in line rotary pumps, installed directly behind the reducing mill.

The prevention (reduction) of water inside the pipe increases the uniformity and stability of the cooling pipes and, consequently, increases the uniformity and stability of the strength properties of metal pipes on the length and the perimeter, which is one of the main indicators of their reliability. In addition, the prevention (reduction) of water inside the non-rotating pipe coming out of the reducing mill, reduces poudriere cooling of the reducing mill pipes of steel grade GS, you can get the strength properties of the finished pipe, the corresponding group of safety "E". However, the ingress of water into the pipe through the free end increases in 1,5-2,0 times the variation of strength properties of length and perimeter compared with the pipes with compressed front section. While there is a significant curvature of the pipe to the refrigerator, preventing their transport line. The final rejection of pipes curvature reaches 100% (using the proposed solution 5%).

The SWAGING of the ends of the TUBES containing mounted in the housing, the tool comprising a ring matrix and rigidly connected with the housing of the power cylinder, the piston rod which is fixed coaxially to the matrix of the plunger, the cross section of which corresponds to the smallest flow cross-section of the tool, wherein the tool is provided with the wedge inclined deforming surface, while in the matrix is a through radial grooves that have wedges and the pusher are made of longitudinal grooves.

 

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