阅读说明：本技术 一种渗碳淬火零件孔保护方法 (Carburized and quenched part hole protection method ) 是由 程孝成 乔亚杰 孙兴鑫 于海峰 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种渗碳淬火零件孔保护方法,包括如下具体步骤：S1、在渗碳淬火零件的零件孔上装入相应的连接件；S2、渗碳处理；S3、油淬冷却；S4、喷砂处理；S5、卸除连接件；本发明提供一种渗碳淬火零件孔保护方法,在含有零件孔的零件渗碳淬火前,在零件孔上装入相应的连接件进行保护,例如在螺纹孔拧入相应规格的普通螺钉进行保护,在销健孔上装入销健,喷砂后再卸下,有效地防止了孔内渗碳、淬火油浸入及砂灰进入,后序无需清理,对于螺纹孔来说容易回丝,效率提高,质量合格,操作简单,效果稳定；本发明进一步还包括零件孔孔口淬火处理,对卸除连接件的渗碳淬火零件孔进行表面淬火处理；提高孔口质量。(The invention discloses a carburized and quenched part hole protection method which comprises the following specific steps: s1, installing corresponding connecting pieces on the part holes of the carburized and quenched parts; s2, carburizing; s3, oil quenching and cooling; s4, performing sand blasting treatment; s5, removing the connecting piece; the invention provides a carburization quenching part hole protection method, before the part containing the part hole is carburized and quenched, the part hole is equipped with corresponding connecting pieces for protection, for example, a common screw with corresponding specification is screwed into a threaded hole for protection, a pin key is arranged on a pin key hole, and the part is dismounted after sand blasting, thereby effectively preventing in-hole carburization, quenching oil immersion and sand ash entering, the subsequent process does not need to be cleaned, the thread return is easy for the threaded hole, the efficiency is improved, the quality is qualified, the operation is simple, and the effect is stable; the invention further comprises quenching treatment of the orifice of the part hole, namely performing surface quenching treatment on the carburized and quenched part hole of the detached connecting piece; improving the quality of the orifice.)

1. A carburized and quenched part hole protection method is characterized by comprising the following steps: the method comprises the following specific steps: s1, installing corresponding connecting pieces on the part holes of the carburized and quenched parts; s2, carburizing; s3, oil quenching and cooling; s4, performing sand blasting treatment; s5, removing the connecting piece.

2. A method of protecting a carburized and quenched part hole as defined in claim 1, wherein: the part hole is a threaded hole, and the connecting piece is a screw matched with the threaded hole.

3. A method of protecting a carburized and quenched part hole as defined in claim 1, wherein: the part hole is a pin key hole, and the connecting piece is a pin key matched with the pin key hole.

4. A method of protecting a carburized and quenched part hole according to claim 3, characterized by: the pin key is in interference fit with the pin key hole.

5. A method for protecting a hole of a carburized and quenched part according to any one of claims 1 to 4, characterized by: and S6, quenching the orifice of the part hole, and performing surface quenching treatment on the carburized and quenched part hole of the dismounted connecting piece.

6. A carburized and quenched part hole protecting method as claimed in claim 5, characterized by: in the step S6, the orifice of the part hole is quenched by flame quenching, the orifice of the part hole is rapidly heated by acetylene-oxygen flame, and then the part hole is cooled by spraying liquid.

7. A carburized and quenched part hole protecting method as claimed in claim 5, characterized by: and S7, tempering the orifice of the part hole, and tempering the quenched orifice of the part hole in time.

8. A method of protecting a carburized and quenched part hole as defined in claim 7, wherein: in said S7, flame tempering is adopted, and the hole openings of the parts are rapidly heated by acetylene-oxygen flame, and then the spray liquid is cooled.

Technical Field

The invention belongs to the technical field of carburizing and quenching treatment, and particularly relates to a method for protecting a carburizing and quenching part hole.

Background

Carburizing and quenching are common heat treatment processes for metal materials, and can ensure that the surface of a workpiece subjected to carburizing obtains high hardness and improve the wear resistance; carburizing and quenching is one kind of metal surface treatment, and is mainly low carbon steel or low alloy steel for carburizing, and the specific method is that the workpiece is set inside active carburizing medium and heated to single phase austenite area at 900-950 deg.c, and after maintaining for some time, the active carbon atoms decomposed from the carburizing medium penetrate into the surface layer of the steel part to obtain high carbon in the surface layer and low temperature nitriding treatment in the core. The common heat treatment process for metal materials can ensure that the surface of a workpiece infiltrated with carbon obtains high hardness and improve the wear resistance of the workpiece.

Quenching processes are widely used in the modern mechanical manufacturing industry. Important parts in machinery, especially steel parts applied to automobiles, airplanes and rockets are almost quenched. In order to meet the various technical requirements of various parts, various quenching processes are developed

However, the penetration quenching part, particularly the end face of the penetration quenching part contains a threaded hole, after carburization quenching, due to carburization quenching deformation in the hole, quenching oil immersion and subsequent sand blasting, sand and ash enter, subsequent cleaning and wire returning are difficult, and unqualified parts often occur, so the inventor provides a carburization quenching part hole protection method by combining various factors.

Disclosure of Invention

The invention aims to: in order to solve the technical problems related to the background technology, a carburized and quenched part hole protection method is provided.

The technical scheme adopted by the invention is as follows:

A carburized and quenched part hole protection method is characterized by comprising the following steps: the method comprises the following specific steps: s1, installing corresponding connecting pieces on the part holes of the carburized and quenched parts; s2, carburizing; s3, oil quenching and cooling; s4, performing sand blasting treatment; s5, removing the connecting piece.

as a further technical scheme of the invention: the part hole is a threaded hole, and the connecting piece is a screw matched with the threaded hole.

As a further technical scheme of the invention: the part hole is a pin key hole, and the connecting piece is a pin key matched with the pin key hole.

As a further technical scheme of the invention: the pin key is in interference fit with the pin key hole.

As a further technical scheme of the invention: and S6, quenching the orifice of the part hole, and performing surface quenching treatment on the carburized and quenched part hole of the dismounted connecting piece.

As a further technical scheme of the invention: in the step S6, the orifice of the part hole is quenched by flame quenching, the orifice of the part hole is rapidly heated by acetylene-oxygen flame, and then the part hole is cooled by spraying liquid.

As a further technical scheme of the invention: and S7, tempering the orifice of the part hole, and tempering the quenched orifice of the part hole in time.

as a further technical scheme of the invention: in said S7, flame tempering is adopted, and the hole openings of the parts are rapidly heated by acetylene-oxygen flame, and then the spray liquid is cooled.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. The invention provides a carburization quenching part hole protection method, before carburization quenching of a part containing a part hole, a corresponding connecting piece is arranged on the part hole for protection, for example, a common screw with a corresponding specification is screwed into a threaded hole for protection, a pin key is arranged on a pin key hole, and the part is dismounted after sand blasting, thereby effectively preventing carburization in the hole, quenching oil immersion and sand ash entering, avoiding cleaning in the subsequent process, easily returning threads for the threaded hole, improving the efficiency, ensuring the qualified quality, being simple to operate and having stable effect.

2. The invention further comprises quenching treatment of the orifice of the part hole, namely performing surface quenching treatment on the carburized and quenched part hole of the detached connecting piece; the orifice of the part hole is subjected to surface quenching by flame quenching, the orifice of the part hole is rapidly heated by acetylene-oxygen flame, and then liquid is sprayed for cooling, so that the quality of the orifice is improved.

3. The invention further comprises tempering treatment of the hole opening of the part, tempering the quenched hole opening of the part in time, adopting flame tempering, rapidly heating the hole opening of the part by using acetylene-oxygen flame, and then spraying liquid for cooling to eliminate the stress of the hole opening.

Drawings

FIG. 1 is a schematic flow diagram of the present invention;

FIG. 2 is a simplified schematic flow diagram of a further embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.