CN102179437A - Head driving process of hammer head of hot rolling pierced billet - Google Patents

Abstract

The invention discloses a head driving process of a hammer head of a hot rolling pierced billet, comprising the following steps of: firstly computing the radial sectional area of the hot rolling pierced billet; then arranging a head driving mould, wherein the middle of the bottom surface of the head driving mould is of a rectangle shape, both sides of the rectangle are of arc shapes, the filling rate of the hot rolling pierced billet in a cavity of the head making mould is bound to be higher than 75 percent and small than 90 percent, and the filling rate is the ratio of the radial cross sectional area of the hot rolling pierced billet to the bottom surface area of the head driving mould; and finally inserting the end part of the hot rolling pierced billet into the cavity of the head driving mould for punching to form the hammer head of the hot rolling pierced billet. The head driving process has the advantages of simple step, convenience for operation, once forming, low labor intensity of workers and effective enhancement of production efficiency; a through hole can be directly formed when the hammer head is punched by adopting the head driving process, and then a hole does not need to be punched again, therefore, the strength of the hammer head can be enhanced and a steel pipe is prevented from being drawn to be broken in the drawing process.

Description

The hot rolling hollow forging tup technology of taking the lead

Technical field

The present invention relates to a kind of steel pipe technology of taking the lead, particularly a kind of tup of hot rolling hollow forging technology of taking the lead.

Background technology

Carrying out in the end of hot rolling hollow forging that tup takes the lead is indispensable important procedure in the steel pipe's production process, its objective is to the steel pipe cold-drawn to get ready, and realizes cold-drawn smoothly.Traditional tup technology of taking the lead is to adopt the mould of " W " shape, divide three steps to realize.The first step: the steel pipe front end is pressed into " W " shape; Second step:, be placed in another hole of mould and be pressed into circle substantially with 90 ° of steel pipe upsets; The 3rd step: move to another hole of mould again, in the transition position punching of tup and steel pipe.The purpose of punching is that the interior gas of pipe is discharged so that acid solution is full of steel pipe when being convenient to acid cleaning of steel tube, helps pickling quality.

Traditional tup technology of taking the lead is comparatively complicated, carry out tup at every turn and take the lead and all need steel pipe is carried several times, working strength of workers is very big, and production efficiency is lower, and also to carry out punching after adopting this method to take the lead to finish, the steel pipe after the punching is easy to pull off when carrying out cold-drawn.

Summary of the invention

At above-mentioned the deficiencies in the prior art, the technical problem to be solved in the present invention provides a kind of simple to operation, labour intensity is low and the hot rolling hollow forging tup that need not punching is taken the lead technology.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

A kind of hot rolling hollow forging tup technology of taking the lead, it comprises the steps

1) at first calculates the radial section area of hot rolling hollow forging;

2) mould of taking the lead is set, be rectangle in the middle of the bottom surface of the described mould of taking the lead, the both sides of rectangle are circular arc, the fullness rate of described hot rolling hollow forging in the described mould vestibule of taking the lead should be greater than 75% and less than 90%, and described fullness rate is the long-pending ratio with the mould base area of taking the lead of hot rolling hollow forging radial cross-section;

3) end of described hot rolling hollow forging is inserted in the cavity of the described mould of taking the lead and carry out the tup that punching press forms the hot rolling hollow forging.

Preferably, described fullness rate should be greater than 80% and less than 85%.

Technique scheme has following beneficial effect: this processing step is simple, easy to operate, but one-shot forming, working strength of workers is little, can effectively enhance productivity, and can be formed directly in through hole when adopting this technology punching press tup, therefore need not again punching again, can strengthen the intensity of tup, prevent that steel pipe from being pulled off in drawing process.

Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.

Description of drawings

Fig. 1 is the take the lead structural representation of mould of the embodiment of the invention.

Fig. 2 is the structural representation of embodiment of the invention hot rolling hollow forging.

Fig. 3 is the structural representation of hot rolling hollow forging tup.

The specific embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described in detail.

This hot rolling hollow forging tup take the lead technology its comprise the steps: at first as shown in Figure 2, calculate the radial section area of hot rolling hollow forging, radial section area F=π (D-d) the * S of hot rolling hollow forging.A dozen head mould tools are set then, as shown in Figure 1, take the lead and be rectangle in the middle of the bottom surface of mould cavity, the both sides of rectangle are circular arc, the fullness rate of hot rolling hollow forging in the mould vestibule of taking the lead should be greater than 75% and less than 90%, fullness rate is the long-pending ratio with the mould base area of taking the lead of hot rolling hollow forging radial cross-section, and pass base area F takes the lead ₀=rectangular area F _a+ circular arc area F _b

$=L*H+2*[\frac{a}{360}*{\mathrm{\πR}}^2-\frac{1}{2}L*\cot \frac{a}{2}*\frac{L}{2}]$

$=L*H+2*[\frac{a}{360}*{\mathrm{\πR}}^2-\frac{1}{4}{L}^2*\cot \frac{a}{2}]$

Fullness rate η=(hollow forging area F/ long-pending F of nib profile that takes the lead then ₀) * 100%, general fullness rate η should be less than 75%, greater than 90%, and is preferred, should be greater than 80% and less than 85%.When the long-pending ratio with the mould base area of taking the lead of hot rolling hollow forging radial cross-section satisfies fullness rate and requires, the end of hot rolling hollow forging is inserted in the cavity of the described mould of taking the lead and carry out the tup that punching press forms the hot rolling hollow forging, hammehead structure is as shown in Figure 3.

This hot rolling hollow forging tup processing step of taking the lead is simple, easy to operate, but one-shot forming, working strength of workers is little, can effectively enhance productivity, and can be formed directly in through hole when adopting this technology punching press tup, therefore need not again punching again, can strengthen the intensity of tup, prevent that steel pipe from being pulled off in drawing process.

More than a kind of hot rolling hollow forging tup that the embodiment of the invention provided technology of taking the lead is described in detail; for one of ordinary skill in the art; thought according to the embodiment of the invention; part in specific embodiments and applications all can change; in sum; this description should not be construed as limitation of the present invention, and all any changes of making according to design philosophy of the present invention are all within protection scope of the present invention.

Claims (2)

1. hot rolling hollow forging tup technology of taking the lead is characterized in that it comprises the steps

1) at first calculates the radial section area of hot rolling hollow forging;

2) mould of taking the lead is set, be rectangle in the middle of the bottom surface of the described mould of taking the lead, the both sides of rectangle are circular arc, the fullness rate of described hot rolling hollow forging in the described mould vestibule of taking the lead should be greater than 75% and less than 90%, and described fullness rate is the long-pending ratio with the mould base area of taking the lead of hot rolling hollow forging radial cross-section;

3) end of described hot rolling hollow forging is inserted in the cavity of the described mould of taking the lead and carry out the tup that punching press forms the hot rolling hollow forging.

2. the hot rolling hollow forging tup according to claim 1 technology of taking the lead, it is characterized in that: described fullness rate should be greater than 80% and less than 85%.

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