阅读说明：本技术 一种大型环件局部连接加工成型工艺 (Local connection machining forming process for large ring piece ) 是由 汪彬 邰华 于 2020-07-10 设计创作，主要内容包括：本发明涉及环件局部连接技术领域,且公开了一种大型环件局部连接加工成型工艺,包括步骤1,模具的准备、步骤2,铁水的浇注、步骤3；模胚的处理和步骤4,后期处理。该大型环件局部连接加工成型工艺,通过向模具内进行浇注铁水,能够提高环件毛坯的生产速度,且震动设备的工作过程中添加的Cr、Mo、Ni等金属元素和C元素,能够保证毛坯的强度,保证其使用效果,进而提高了其使用寿命。(The invention relates to the technical field of local connection of ring pieces, and discloses a local connection machining and forming process of a large ring piece, which comprises the following steps of 1, preparing a mould, 2, pouring molten iron and 3; and 4, processing the mold blank, and performing post-processing. According to the local connection machining and forming process for the large ring piece, molten iron is poured into the mold, the production speed of a ring piece blank can be increased, metal elements such as Cr, Mo and Ni and C elements added in the working process of the vibration equipment can ensure the strength of the blank, the using effect of the blank is ensured, and the service life of the blank is prolonged.)

1. A local connection processing and forming process for a large ring piece is characterized by comprising the following steps: the method comprises the following steps:

step 1, preparation of a mold: selecting ring piece molds with different sizes as required, cleaning the interiors of the molds to ensure the quality of the processed workpieces, and spraying a release agent on the surfaces of the molds;

step 2, pouring molten iron: pouring molten iron into the mold, wherein the pouring amount of the molten iron is one third of that of the mold, continuously adding metal elements such as Cr, Mo and Ni into the mold after the pouring is finished, wherein the metal elements such as Cr, Mo and Ni respectively account for 0.8-0.83%, 0.5-0.52% and 1-1.3%, continuously adding C into the mold after the metal elements are completely added, the C accounts for 0.5-0.55%, continuously pouring the molten iron into the mold after the adding is finished, and finally cooling the mold through external cooling equipment, wherein the temperature of the mold after the cooling is 40-50 ℃;

step 3, processing the mold blank; taking out the ring blank in the cooled die in the step 2, and rolling and forming the ring blank by axial closed rolling forming equipment to ensure that the surface of the ring blank is smooth, wherein the feeding amount of the axial closed rolling forming equipment is 2-2.5 mm/rad;

step 4, post-processing; and carrying out heat treatment on the shaped ring piece, machining a center hole of the ring piece through a machine after the heat treatment is finished, and finally polishing the ring piece through a polishing machine to obtain the final ring piece, wherein the polishing mesh number of the polishing machine is 500 meshes.

2. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: the mould is fixedly arranged on a vibrating device, and is vibrated in the molten iron pouring process, so that the uniformity of molten iron pouring is ensured, metal elements such as Cr, Mo and Ni and C elements are uniformly filled into the molten iron, and the quality of the ring blank is ensured.

3. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: the release agent adopts a solid lubricant, namely boron nitride, as a main raw material, so that the boron nitride lubricating agent can keep excellent lubricity and release property under the condition of ultrahigh temperature.

4. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: the external cooling equipment is a cooling tank body, a mold for pouring molten iron is placed in the cooling tank body through a movable hanging bracket, and rapid cooling is carried out for 10-20 min.

5. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: and a layer of finish paint is sprayed on the surface of the manufactured ring piece, and titanium dioxide is added into a paint base of the finish paint, so that the ring piece can be protected.

6. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: and detecting cracks and defects in the manufactured ring piece flaw detection equipment by using ultrasonic waves.

7. The local connection processing and forming process of the large ring piece according to claim 1, wherein the local connection processing and forming process comprises the following steps: and sealing and packaging the manufactured ring piece by an automatic packaging machine for subsequent conveying.

Technical Field

The invention relates to the technical field of ring part local connection, in particular to a local connection processing and forming process of a large ring part.

Background

The ring is generally produced by plastic working process of reducing wall thickness, enlarging diameter and forming section profile of the ring by a ring rolling device, namely a ring rolling mill (also called a rolling mill or a hole expanding mill).

At present, in the application document with the publication number CN105328086B, a local continuous loading forming method for a large ring is disclosed, in which a ring preform mold and a ring mold are manufactured according to the difference of the ring; placing the blank and the ring prefabricated blank die on an axial closed rolling forming device to form the ring prefabricated blank; and placing the ring preform and the ring die on an axial closed rolling forming device to form the ring, and trimming, heat treating and machining the formed ring to obtain the final ring. According to the invention, two different feed amounts are adopted in the ring preform and the ring forming process, so that the phenomena of uneven metal forming, disordered metal flow line and poor metal structure are avoided in the ring preform and ring forming process, and the performance of a workpiece can be effectively improved;

the above patent needs to use an axial closed rolling forming device in the process of producing the ring blank, the operation is troublesome, the processing time is long, the production effect of the ring is affected, various metal elements cannot be added into the ring to improve the use strength of the ring, and the service life of a finished product is further short.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a local connection processing and forming process of a large ring piece, which has the advantages that the production speed of a ring piece blank can be improved by pouring molten iron into a die, and the strength of the blank and the use effect of the blank can be ensured by adding metal elements such as Cr, Mo and Ni and C elements in the working process of vibration equipment, so that the service life of the ring piece blank is prolonged.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a local connection machining forming process for a large ring piece comprises the following steps:

step 1, preparation of a mold: selecting ring piece molds with different sizes as required, cleaning the interiors of the molds to ensure the quality of the processed workpieces, and spraying a release agent on the surfaces of the molds;

step 2, pouring molten iron: pouring molten iron into the mold, wherein the pouring amount of the molten iron is one third of that of the mold, continuously adding metal elements such as Cr, Mo and Ni into the mold after the pouring is finished, wherein the metal elements such as Cr, Mo and Ni respectively account for 0.8-0.83%, 0.5-0.52% and 1-1.3%, continuously adding C into the mold after the metal elements are completely added, the C accounts for 0.5-0.55%, continuously pouring the molten iron into the mold after the adding is finished, and finally cooling the mold through external cooling equipment, wherein the temperature of the mold after the cooling is 40-50 ℃;

step 3, processing the mold blank; taking out the ring blank in the cooled die in the step 2, and rolling and forming the ring blank by axial closed rolling forming equipment to ensure that the surface of the ring blank is smooth, wherein the feeding amount of the axial closed rolling forming equipment is 2-2.5 mm/rad;

step 4, post-processing; and carrying out heat treatment on the shaped ring piece, machining a center hole of the ring piece through a machine after the heat treatment is finished, and finally polishing the ring piece through a polishing machine to obtain the final ring piece, wherein the polishing mesh number of the polishing machine is 500 meshes.

Preferably, the mould is fixedly arranged on a vibrating device, and is vibrated in the molten iron pouring process, so that the uniformity of molten iron pouring is ensured, metal elements such as Cr, Mo and Ni and C elements are uniformly filled in the molten iron, and the quality of the ring blank is ensured.

Preferably, the release agent adopts a solid lubricant, namely boron nitride, as a main raw material, so that the boron nitride lubricating oil can keep excellent lubricity and release property under the condition of ultrahigh temperature.

Preferably, the external cooling equipment is a cooling tank body, the mold for pouring molten iron is placed in the cooling tank body through a movable hanger for rapid cooling, and the cooling time is 10-20 min.

Preferably, a layer of finish paint is sprayed on the surface of the manufactured ring piece, and titanium dioxide is added into a paint base of the finish paint, so that the ring piece can be protected.

Preferably, the manufactured ring flaw detection device detects cracks and defects in the ring flaw detection device, and the detection method of flaw detection is ultrasonic.

Preferably, the finished ring is hermetically packaged by an automatic packaging machine for subsequent transport.

(III) advantageous effects

Compared with the prior art, the invention provides a local connection processing and forming process for a large ring piece, which has the following beneficial effects:

1. the local connection machining forming process for the large ring piece can rapidly produce a ring piece blank by arranging the annular die capable of being poured, metal elements such as Cr, Mo and Ni and elements C are added in the pouring process, the die is vibrated in the molten iron pouring process through the arranged vibrating equipment, the uniformity of molten iron pouring is further ensured, the metal elements such as Cr, Mo and Ni and the elements C are uniformly filled into molten iron, the quality of the ring piece blank is ensured, the integral strength of the ring piece blank can be improved, multiple blanks can be shaped and machined through the arranged axial closed type rolling forming equipment, the use precision of the multiple blanks is improved, and the machining of heat treatment and polishing is continued after the construction is completed, the precision of the ring piece is further improved, and the use effect of the ring piece is ensured.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A local connection machining forming process for a large ring piece comprises the following steps: