CN116393633A - Forging method of roll end flat head forging piece for rolling mill - Google Patents

Abstract

The invention discloses a method for forging a roll-end flat head forging for a rolling mill, which is characterized in that it comprises the following steps: a, steel ingot upsetting and unloading; b, first fire heating the steel ingot, shifting the nozzle, flattening the riser line, Chamfering and rounding, spherical upsetting; c, elongating the billet obtained in step b, rounding, and blanking; d, the second torch, upsetting the billet, and keeping it warm for 5 hours; e, elongating the upsetting in step d The billet is rounded and separated to obtain a billet comprising a flat head end and a round roller head end; f, pulling out the flat head end, and forging the flat head end; Heating, using a leaky mold to upset the flat end, keeping it warm for 3 hours, rounding the flat end and correcting the shape; h, normalizing, tempering, and obtaining the roll end flat end forging for the rolling mill. In the present invention, the flat head end can be separated by first drawing to a smaller diameter, and then the combined leaky mold is used to upset and form the circular roller head, which greatly reduces the product manufacturing cycle and mold cost.

Description

A kind of forging method of roll end flat head forging for rolling mill

technical field

The invention belongs to the field of forging processing, and in particular relates to a forging method of a roll end flat head forging for a rolling mill.

Background technique

Forgings in the shape of a flat head at the end of the roll are mainly used for parts and components of rolling mill equipment, and have high performance requirements. Usually, CrNiMo series materials are used. The shape is characterized by a round roll head at one end and a plate-shaped flat head at the other end. The blank margin of the forging made by free forging is very large, which is not conducive to cost control.

The conventional forging process route has the following two types:

1. Steel ingot upsetting and unloading - multiple upsetting and drawing - separate material forming;

2. Steel ingot upsetting and unloading - multiple upsetting and drawing - sawing and forming flat heads.

The first of the above two methods is ordinary free forging. Since the weight of the flat head forging is relatively small, the weight of the flat head end needs to be increased for the convenience of material distribution. The forged flat head end has a large margin, and it is easy to produce Obvious segregation, the forgings produced can only meet the general shape; the second method of sawing can control the forming size better, but the sawed material can only be treated as waste, resulting in unnecessary waste of materials.

Contents of the invention

The technical problem to be solved by the present invention is to provide a forging method for flat head forgings of roll ends for rolling mills in view of the deficiencies in the prior art above. The mold is used to form a round roller head by upsetting, which greatly reduces the product manufacturing cycle and mold cost.

The technical solution adopted in the present invention is: a forging method of a roll end flat head forging for a rolling mill, comprising the following steps:

a. Steel ingot upsetting and unloading;

b. In the first fire, heat the steel ingot to 850°C-1230°C, adjust the nozzle, flatten the riser line, round the chamfer, and upset the spherical surface;

c, elongate the billet obtained in step b, round it, and blank it;

d. In the second fire, heat the billet obtained in step c to 850°C-1230°C, upsetting the billet, and keep it warm for 5h;

e. Heating up to 850°C-1240°C, elongating the upset billet in step d, rounding and splitting, to obtain a billet comprising a flat head end and a round roller head end;

f. Pull out the flat head end and forge the flat head end;

g. The third fire reheats the blank obtained in step e to 850°C-1240°C, upsetting the flat end with a leaky mold, keeping it warm for 3 hours, rounding the flat end and correcting the shape;

h. Normalizing and tempering to obtain the roll end flat head forging for the rolling mill.

In one of the embodiments, in step b, the miscellaneous nozzle is used to remove the impurity existing at the sedimentation cone at the nozzle end.

In one embodiment, in step c, the surface defects of the billet are removed in time.

In one embodiment, in step e, the surface defects of the billet are removed in time.

In one of the embodiments, in step e, the diameter of the obtained flat head end and the circular roller head end are the same.

In one embodiment, in step f, during the elongation process, the eccentricity is <20 mm.

In one of the embodiments, in step f, after the flat head is pulled out, the excess material of the riser is cut off, and the test mold is installed to confirm whether the size is qualified.

The beneficial effect of the present invention is that the flat head end can be separated by first drawing it to a smaller diameter, and then the combined leaky mold is used to upset and form the circular roller head, which greatly reduces the product manufacturing cycle and mold cost.

Detailed ways

The present invention will be further described in detail in conjunction with specific embodiments below.

The invention discloses a forging method of a roll end flat head forging for a rolling mill, which comprises the following steps:

a. Steel ingot upsetting and unloading;

b. In the first fire, heat the steel ingot to 850°C-1230°C, adjust the nozzle, flatten the riser line, round the chamfer, and upset the spherical surface;

c, elongate the billet obtained in step b, round it, and blank it;

d. In the second fire, heat the billet obtained in step c to 850°C-1230°C, upsetting the billet, and keep it warm for 5h;

e. Heating up to 850°C-1240°C, elongating the upset billet in step d, rounding and splitting, to obtain a billet comprising a flat head end and a round roller head end;

f. Pull out the flat head end and forge the flat head end;

g. The third fire reheats the blank obtained in step e to 850°C-1240°C, upsetting the flat end with a leaky mold, keeping it warm for 3 hours, rounding the flat end and correcting the shape;

h. Normalizing and tempering to obtain the roll end flat head forging for the rolling mill.

In this embodiment, in step b, the wrong nozzle is used to remove the impurity existing at the sedimentation cone at the nozzle end.

In this embodiment, in step c, the surface defects of the billet are removed in time.

In this embodiment, in step e, the surface defects of the billet are removed in time.

In this embodiment, in step e, the diameter of the obtained flat head end and the circular roller head end are the same.

In this embodiment, in step f, during the elongation process, the eccentricity is <20mm.

In this embodiment, in step f, after pulling out the flat head end, cut off the excess material of the riser, and test the mold to confirm whether the size is qualified.

In step b, upsetting heads are used for spherical upsetting. In step c, it is elongated and rounded, and the upper and lower flat anvils, lower V-shaped anvils and chopping knives are used for cutting. In step d, the upsetting blank adopts upsetting caps. In step e, the upper and lower flat anvils, lower V-shaped anvils and triangular knives are used for elongating and rounding. In step f, the upper and lower flat anvils are used to pull out the elongated flat head. In step g, the upsetting flat head end adopts a leaky mold, and the rounded flat head end and corrected molding adopt upper and lower flat anvils and lower V-shaped anvils.

The present invention adopts a combined design, which can be used in combination with different steel plate sizes and leaky molds according to different types of roller end flat heads, so that the mold manufacturing cost is reduced and the production cycle is shorter; after the second fire upsetting, the diameter is not very large In the case of forming the flat head first, the third fire is upsetting and rounding the roller end; the upper and lower flat head slots of the combined leaky mold must have a width difference of 20 mm, and the forging is easy to demould after the mold is installed.

The above-mentioned embodiments only express the specific implementation manner of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (7)

1. The forging method of the roll end flat head forging piece for the rolling mill is characterized by comprising the following steps of:

a. upsetting and pulling the steel ingot for blanking;

b. heating the steel ingot to 850-1230 ℃ by first fire, staggering a water gap, flattening a riser wire, chamfering, rounding and upsetting a spherical surface;

c. drawing, rounding and blanking the blank obtained in the step b;

d. heating the blank obtained in the step c to 850-1230 ℃ by second fire, upsetting the blank, and preserving the heat for 5h;

e. heating to 850-1240 ℃, drawing the blank upset in the step d, rounding and distributing to obtain a blank comprising a flat head end and a round roller head end;

f. drawing the flat head end, and forging the flat head end to form;

g. c, heating the blank obtained in the step e again by third fire to 850-1240 ℃, upsetting the flat head end by using a leaky die, preserving heat for 3h, rounding the flat head end and correcting and forming;

h. normalizing and tempering to obtain the roll end flat head forging piece for the rolling mill.

2. The forging method of a roll end flat head forging for a rolling mill according to claim 1, wherein in the step b, the staggered water gap is used for removing the impure material existing at the water gap end deposition cone.

3. The forging method of a roll end flat head forging for a rolling mill according to claim 1 or 2, wherein in the step c, surface defects of the blank are removed in time.

4. The forging method of a roll end flat head forging for a rolling mill according to claim 3, wherein in the step e, surface defects of the blank are removed in time.

5. The forging method of a roll end flat head forging for a rolling mill according to claim 4, wherein in the step e, the obtained flat head end and the round roll end have the same diameters.

6. The method according to claim 5, wherein in the step f, the eccentricity is less than 20mm during the drawing process.

7. The method according to claim 6, wherein in the step f, after the flat head end is drawn, excess riser is cut off, and the die is fitted to confirm whether the size is acceptable.