Method for production of pump rod

FIELD: technological processes.

SUBSTANCE: end section of billet is heated and deformed in die block. At that at first metal is accumulated for molding of rod head. Accumulation is done in at least three stages in puncheon cavity. Volume of this cavity is selected provided that its value is reduced from the first stage of deformation to the last one in interval that makes 1.2÷1.1 from volume of finished rod head. Then nipple part of head is molded in puncheon cavity with provision of its profile and geometric dimensions. Remaining part of rod head external surface is molded in matrix cavity.

EFFECT: higher quality of produced items with simultaneous simplification of production and reduction of expenses.

2 dwg

 

The invention relates to the processing of metals by pressure and can be used for the manufacture of products by stamping leaf.

A method of producing rod (U.S. Pat. EN 2119858, IPC6B23P 15/00, publ. 1998.10.10), which includes heating the workpiece, forming a deformation profile and the geometric dimensions of the outer surface of the head bar, the manufacture of a rod body and the connection of the body and head by friction welding.

A known method for the production of hollow sucker rods (U.S. Pat. EN 2233214, IPC7VR 15/00, publ. 2003.10.27), comprising heating a hollow workpiece, the formation of the deformation profile and the geometric dimensions of the outer surface of the head bar, the subsequent execution at the head end-to-end channel drilling, fabrication of a rod body and the connection of the body and head by friction welding.

When using these methods get neravnopolochny pumping rod with welded seams, reducing the strength of the rod, which may lead to its breakage in welding when working in a complex alternating loads which are experienced by the rod during the operation.

Closest to the claimed and accepted as the prototype is a method of manufacturing a rod (U.S. Pat. CN 1117896, IPC WC 21/12, publ. 1996.03.06), including heating of the end portion of the workpiece and its deformation in the stamp with prior is a PR metal in the matrix and the subsequent formation of the profile and the geometric dimensions of the nipple part into the cavity of the punch and the rest of the outer surface of the head of the rod in the matrix.

This method allows you to get ravnopolochnyy rod without welds.

However, it does not provide the required quality of the finished rod, complex, and expensive. This is because when the set of metal in the matrix metal flows into the clearance between the punch and the matrix with the formation of the end of the Burr, which can zastupajutsa on the second transition and will lead to marriage in the manufacture of the hollow rod and the necessity of introducing additional processing of the outer surface in the manufacture of a solid rod. In addition, when manufacturing such a way that the hollow rod is necessary to use a long punch small diameter. When deformation of the punch is experiencing bending and abrasion, which reduces the resistance of the punch. In the stamping process possible adhesion of workpiece material to the punch, which complicates its removal after stamping.

The objective of the invention is to improve the quality of the obtained rod, simpler and cheaper method of manufacture.

The problem is solved by the improved method of manufacture of the pump rod, comprising heating the end portion of the workpiece and its deformation in the stamp set metal for forming the head of the rod and the subsequent formation of the threaded part of the head to receive her profile and geometrical dimensions of the cavity of the plug and the other is part of the outer surface of the head of the rod in the matrix.

To solve the problem of the deformation of the end portion of the workpiece with a set of metal exercise at least three transition in a cavity made in the punch, whereby the volume of said cavity is chosen from the condition of ensuring the reduction of its magnitude from the first transition of the deformation to the last interval, comprising 1,2÷1,1 volume of the finished head rod.

Such deformation of the end portion of the workpiece allows you to set the desired amount of metal to form the head of the rod with the degree of deformation, excluding the flowing of metal between the punch and the matrix.

In addition, in the manufacture of a hollow rod carry out the deformation of the end portion of the hollow workpiece mounted on the mandrel, using a small punch length, and since the force deformation mainly acts on the outer surface of the end portion of the workpiece, the adhesion of workpiece material to the mandrel does not occur.

The invention is illustrated by drawings, where figure 1 shows sketches of the original blanks for the manufacture of hollow sucker rods after transitions stamping, figure 2 - strand stamp for manufacturing a hollow pump rod (the tail part of the billet is shown by the dotted line).

The method is as follows.

The tail section of the workpiece 1 on Renaut and deform with the preliminary set of metal stamped with the punch 2. The punch made the cavity 3, in which a set of metal. In the case of manufacturing a hollow pump rod is deformed hollow workpiece mounted on the mandrel 4. In the figure 1 embodiment, the set of metal is carried out in three transition, the volume of the cavity 3 of the plug 2 is chosen from the condition of decreasing its value from the first transition of the deformation to the last interval, comprising 1.2 to 1.1 times the volume of metal ready head rod. Then form the profile and the geometric dimensions of the nipple part into the cavity 5 of the punch 6 and the outer surface of the rest of the heads of the rods in the matrix 7.

The proposed method is tested during manufacturing continuous sucker rod pump rod 25 length LW=8000 mm, an outer diameter of a rod body 25.4 mm, of steel GM. The parameters of the original billet length LC=8400 mm, outer diameter DNC=25,4 mm Billet was heated to a temperature of 1200°C. Forgings made on horizontal forging-strand machine (GCM) with a force of 400 tons In the first three streams (I, II, III) carried out a set of metal. The volume of the cavity 3 of the plug 2 at the I-stream 1, 2, II - 1,15, III - 1.1 of the volume of the head of the finished rod. In the fourth stream was carried out prior to the formation of the profile and the geometric dimensions of the outer surface of the head, V - final. In the sixth stream was carried out by trimming Burr.

Similarly, the method was tested in the manufacture of a hollow rod sucker rod 25 length LW=8000 mm, an outer diameter of a rod body 25.4 mm, with channel diameter of 14 mm of steel GM. As the original used a hollow billet with parameters length LC=8400 mm, outer diameter - DNC=25.4 mm, the diameter of cavity - dVZ=14 mm, Diameter 14 mm

Thus, the use of the proposed method to the cost and complexity of obtaining ravnopolochny solid or hollow pump rod.

1. A method of manufacturing a pump rod, comprising heating the end portion of the workpiece and its deformation in the stamp set metal for forming the head of the rod and the subsequent formation of the threaded part of the head to receive her profile and geometrical dimensions of the cavity of the punch and the rest of the outer surface of the head of the rod in the matrix, characterized in that the deformation of the end portion of the workpiece with a set of metal exercise at least three transition in a cavity made in the punch, whereby the volume of said cavity is chosen from the condition of ensuring the reduction of its magnitude from the first transition of the deformation to the last interval, comprising 1,2÷1,1 from the volume of the finished head rod.

2. The method according to claim 1, characterized in that the use of a hollow workpiece and deformirovny the s its end portion is carried out on the frame.



 

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