阅读说明：本技术 一种截面含突变曲线的合金钢异形环件轧制方法 (Rolling method of alloy steel special-shaped ring piece with section containing abrupt change curve ) 是由 蒋起臣 冯吉威 王永生 邓咏梅 赵慧 于 2019-10-09 设计创作，主要内容包括：本发明提出一种截面含突变曲线的合金钢异形环件轧制方法,包括下料得到初始毛坯；将达到锻造温度要求的初始毛坯制成环轧毛坯；将环轧毛坯放入扩孔机进行环轧成形,获得异形截面环锻件。本发明能够实现截面含突变曲线的异形环件的轧制；异形环轧所需变形力大幅度减小,生产成本降低；轧制内部质量好,内部组织细密,晶粒细小,纤维沿圆周方向排列,其机械强度、耐磨性和疲劳寿命明显提高；产品精度高,机械加工量少,材料利用率较高；生产效率高,轧制速度快；解决环轧过程中的充不满、鱼尾凹坑、尺寸超差等缺陷；作为一次轧制成形,能够实现最经济、最高效的批量生产。(The invention provides a rolling method of an alloy steel special-shaped ring piece with a section containing a mutation curve, which comprises the steps of blanking to obtain an initial blank; making the initial blank meeting the forging temperature requirement into a ring rolling blank; and (4) putting the ring rolling blank into a hole expanding machine for ring rolling forming to obtain the ring forging with the special-shaped section. The rolling method can realize rolling of the special-shaped ring piece with the section containing the mutation curve; the deformation force required by the special-shaped ring rolling is greatly reduced, and the production cost is reduced; the rolling internal quality is good, the internal structure is fine, the crystal grains are fine, the fibers are arranged along the circumferential direction, and the mechanical strength, the wear resistance and the fatigue life of the fiber are obviously improved; the product precision is high, the machining amount is small, and the material utilization rate is high; the production efficiency is high, and the rolling speed is high; the defects of insufficient filling, fishtail pits, size over-tolerance and the like in the ring rolling process are overcome; the most economical and efficient mass production can be realized as the primary roll forming.)

1. A rolling method of an alloy steel special-shaped ring part with a section containing a sudden change curve is characterized by comprising the following steps:

s1, blanking: blanking to obtain an initial blank;

s2, blank making: carrying out the processes of upsetting, punching by a punch, forming by a forming die, taking the punch from a leak hole and flattening the end surface of the initial blank meeting the forging temperature requirement to obtain a ring rolling blank;

s3, ring rolling: and (3) putting the ring rolling blank into a hole expanding machine, and carrying out ring rolling forming by using a driving roller and a core roller to finally obtain the ring forging with the special-shaped section.

2. The rolling method according to claim 1, wherein in the punch punching process of step S2, after the punch is pressed into the blank by applying pressure, the blank is directly placed into the forming die without being taken out, and after the forming die is formed, the punch is taken out and the hole is reversed, so as to ensure that the punched hole size meets the requirement.

3. The rolling method according to claim 1, wherein in the step S3, the ring rolling uses an integrated driving roll which is directly roll-formed in a half-open manner using a cylindrical core roll.

Technical Field

The invention belongs to the technical field of rolling processing, and particularly relates to a rolling method of an alloy steel special-shaped ring piece with a section containing a mutation curve.

Background

The ring rolling process, also called reaming or ring rolling, is a continuous local plastic forming process for reducing the wall thickness of a ring, enlarging the diameter and forming the cross-section profile by ring rolling equipment such as a reaming machine, a ring rolling mill and the like. The traditional ring rolling process is suitable for ring pieces with rectangular or nearly rectangular sections, and subsequent large amount of mechanical processing is needed for the ring pieces with complex sections, so that the special-shaped ring rolling is the inevitable direction for the development of the ring rolling process. The special-shaped ring rolling process has the advantages of high material utilization rate, high rolling efficiency, low production cost, high precision of the obtained ring piece, small machining allowance and high mechanical strength, is suitable for titanium alloy, high-temperature alloy and other metals which are difficult to deform, and is widely applied to the fields of aerospace, power petrochemical industry, large machinery, vehicle technology and the like.

At present, the basic principle, the deformation rule, the process parameters, the defect control and other aspects of the special-shaped ring rolling are studied in detail at home and abroad, and with the development of finite element simulation, the research subjects mainly based on numerical analysis are increased, but the content and cases related to actual production are relatively less. Meanwhile, research objects mainly focus on L-shaped, T-shaped, inner boss, inner groove, outer boss, outer groove and other cross section shapes, all the cross section shapes can be divided into rectangles or nearly rectangles, and the design research on the rolling process of the ring piece with a sudden change curve in the cross section is less. Compared with a rectangular forge piece, the metal flow is more difficult when the forge piece with the mutation curve is rolled, various defects are easy to generate, and the requirements on blank design and process design are higher.

Disclosure of Invention

Technical problem to be solved

The invention provides a rolling method of an alloy steel special-shaped ring piece with a section containing an abrupt change curve, and aims to solve the technical problem of how to prepare a complex annular forging piece with a section outline composed of a rectangle, a nearly rectangle and an abrupt change curve.

(II) technical scheme

In order to solve the technical problem, the invention provides a rolling method of an alloy steel special-shaped ring piece with a section containing a mutation curve, which comprises the following steps:

s1, blanking: blanking to obtain an initial blank;

s2, blank making: carrying out the processes of upsetting, punching by a punch, forming by a forming die, taking the punch from a leak hole and flattening the end surface of the initial blank meeting the forging temperature requirement to obtain a ring rolling blank;

s3, ring rolling: and (3) putting the ring rolling blank into a hole expanding machine, and carrying out ring rolling forming by using a driving roller and a core roller to finally obtain the ring forging with the special-shaped section.

Further, in the punch punching process of step S2, after the punch is pressed into the blank by applying pressure, the punch is directly placed in the forming die for press forming without being taken out, and after the forming die is formed, the punch is taken out and the hole is reversely perforated, so as to ensure that the punching size meets the requirement.

Further, in step S3, the ring rolling uses an integral driving roll that is directly roll-formed in a half-open manner using a cylindrical core roll.

(III) advantageous effects

The invention provides a rolling method of an alloy steel special-shaped ring piece with a section containing a mutation curve, which comprises the steps of blanking to obtain an initial blank; carrying out the processes of upsetting, punching by a punch, forming by a forming die, taking the punch from a leak hole and flattening the end surface of the initial blank meeting the forging temperature requirement to obtain a ring rolling blank; and (3) putting the ring rolling blank into a hole expanding machine, and carrying out ring rolling forming by using a driving roller and a core roller to finally obtain the ring forging with the special-shaped section.

The invention has the following beneficial effects: (1) rolling the special-shaped ring piece with the section containing the mutation curve; (2) compared with die forging forming, the deformation force required by special-shaped ring rolling is greatly reduced, the requirement on the tonnage of equipment is reduced, and the production cost is reduced; (3) the rolled ring has good internal quality, the rolled ring has fine internal structure and fine crystal grains, the fibers are arranged along the circumferential direction, and the mechanical strength, the wear resistance and the fatigue life of the rolled ring are obviously higher than those of other ring produced by forging and machining; (4) the product precision is high, the machining amount is small, and the material utilization rate is high; the production efficiency is high, the rolling speed is high and is higher than the free forging and flame cutting of the ring piece; (5) the rolling defects of insufficient filling, fishtail pits, size out-of-tolerance and the like caused by a blank making process in the ring rolling process are overcome; (6) the invention is formed by one-time rolling, combines the existing equipment conditions, and realizes the most economical and efficient batch production.

Drawings

FIG. 1 is a schematic view of a special-shaped ring member with a section containing an abrupt change curve according to an embodiment of the present invention;

FIG. 2 is a flow chart of blank making in an embodiment of the present invention;

FIG. 3 is a front view of a ring rolled blank in an embodiment of the present invention;

FIG. 4 is a front view of a tire mold in an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a ring rolling drive roll in an embodiment of the present invention.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

The embodiment provides a rolling method of an alloy steel special-shaped ring piece with a section containing an abrupt change curve, which is used for rolling the special-shaped ring piece with the section containing the abrupt change curve shown in figure 1. The rolling method specifically comprises the following steps:

s1, blanking: blanking by adopting a sawing machine to obtain an initial blank, wherein the length and the diameter of the initial blank are obtained by calculation by combining a part diagram and a forging diagram and considering factors such as material utilization rate, deformation step and the like;

s2, blank making: the initial blank meeting the forging temperature requirement is subjected to the working procedures of upsetting, punching by a punch, forming by a die, fetching the punch from a leak hole, flattening the end face and the like shown in figure 2 to obtain the ring rolling blank shown in figure 3, wherein the size of the ring rolling blank is calculated by a rigid translation principle.

In the punch punching procedure in the step, after pressure is applied to press the punch into the blank, the punch is not taken out temporarily and is directly put into a forming die for press forming, the total height of the forming die and the gap size between an upper forming die and a lower forming die are required to be in accordance with requirements, after the forming of the forming die, the punch is taken out and a hole is reversely leaked, and the punching size is ensured to be in accordance with the requirements. The tire mold used in the tire mold forming process in this step, as shown in fig. 4, is designed according to the size of the ring-rolled blank.

S3, ring rolling: and (3) putting the ring rolling blank into a hole expanding machine, and carrying out ring rolling forming by using a driving roller and a core roller to finally obtain the ring forging with the special-shaped section. In this step, ring rolling was performed by direct roll forming in a half-open manner using an integral driving roll using a cylindrical core roll as shown in fig. 5.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.