CN2394919Y

CN2394919Y - Plasma torch nozzle for surface quenching of iron and steel piece

Info

Publication number: CN2394919Y
Application number: CN 99222215
Authority: CN
Inventors: 李惠琪; 胡建明; 孙玉宗; 栾兆群; 朱绪力
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 1999-09-07
Filing date: 1999-09-07
Publication date: 2000-09-06
Anticipated expiration: 2009-09-07

Abstract

The utility model relates to a plasma torch nozzle for surface quenching of an iron and steel component, which has a structure that a nozzle outlet is a flat and long shape or an arrangement shape with a plurality of holes. The central maximum temperature zone of a plasma beam current which is compressed by the nozzle outlet expands or disperses long the direction of a long shaft, which leads the distribution of temperature on the direction of the long shaft to become slow. The central thickness of the distribution of temperature on the direction of a short shaft to be smaller than a single circle. When the plasma beam current carries out quenching scanning on the surface of the iron and steel component along the direction of the short shaft, a quenching hardening belt broadens, and the difference of quenching depth is reduced. Consequently, the quenching quality of the surface of the iron and steel component is improved.

Description

Steel-iron components hard surfacing plasmatorch nozzle

The utility model relates to a kind of steel-iron components hard surfacing plasmatorch nozzle that is used for, and belongs to metal heat treatmet equipment.

Plasmatorch is that the gaseous arc compression is formed the high energy beam generating unit of high temperature and high speed plasma beam from nozzle center's hole ejection.Steel-iron components carries out surperficial rapid scanning with plasma beam and quenches to make things convenient for and promptly make manufactured part obtain hardened wear-resistant layer, and distortion is very little.Used in the past hard surfacing is the circular single hole of centre hole with the plasmatorch jet exit, and the beam-plasma flow section of hole ejection also is circular thus.The patent No. is that the utility model patent of ZL96228948.5 has proposed a kind of endoporus quenching or fusing hardening plasmatorch, but does not also relate to the cross-sectional shape of plasmatorch jet exit.The rounded section plasma beam core temperature that is formed by single round center hole compression is the highest, outwards sharply reduce, scanning strip core temperature height and sweep time are long when being used for the steel-iron components hard surfacing, the piece surface of very easily burning, and place, scanning quenching zone two edges under hardening, and the surface hardening quality is inhomogeneous.

The purpose of this utility model is to propose a kind of plasmatorch nozzle that can improve steel-iron components surface plasma bundle scanning quenching quality.

Structure of the present utility model mainly is that the jet area shape is a prolate shape hole or the very near circular port of two or more distance, the prolate hole can be a rectangle, it also can be ellipse etc., when being plural hole, arrangement mode can tighten the solid matter row at coaxial line, also can submit wrong the arrangement at different axis.

Accompanying drawings embodiment of the present utility model.

Fig. 1 is that outlet is that the front view of oval nozzle body, Fig. 2 are that the vertical view of Fig. 1 promptly sprays apart from the cross-sectional shape figure of outlet.

Fig. 3 is that outlet is that three hole coaxial lines are arranged the front view of shape spray apart from body, and Fig. 4 is that the vertical view of Fig. 3 is the cross-sectional shape figure of jet exit.

Fig. 5 is that outlet is that the vertical view that the different axis in four holes are arranged the shape nozzle body is the cross-sectional shape figure of jet exit, omits front view.

Marginal data: (1)-nozzle body; (2)-jet exit.

Embodiment among Fig. 1,2 is processed into oval jet exit (2) in the end of nozzle body (1), and its major and minor axis ratio is 3: 1.

Embodiment among Fig. 3,4 is processed into three circular holes (2) in the end of nozzle body (1), and circular hole communicates with the main aperture of nozzle body, and three circular holes are on an axis, and the circular hole back gauge is less than 0.5mm.

Embodiment is processed into four circular holes (2) in the end of nozzle body (1) among Fig. 5, and circular hole communicates with the main aperture of nozzle body, per two circular holes on an axis, two hole staggered arrangement on the axis, the circular hole back gauge is less than 0.5mm.

The utility model has the advantages that: through the plasma beam of flat nozzle outlet (2) compression, Its cross section also is flat, and the center highest temperature zone will or be disperseed along the long axis direction expansion, make temperature Be distributed in and become comparatively mild on the long axis direction, plasma arc center thickness ratio on short-axis direction Single circular hole reduces. When this kind plasma beam is quenched on the steel-iron components surface along short-axis direction During fire scanning, the quench hardening band broadens, and depth of quenching difference reduces, and burns along scanning band center line The possibility of erosion reduces than single circular central hole nozzle. If two or more little circles During the hole, plasma beam will broaden along the arrangement direction in hole, plays equally the effect in long flat hole.

Claims

1. steel-iron components hard surfacing plasmatorch nozzle, it comprises nozzle body and jet exit, the cross-sectional shape that it is characterized in that jet exit is the prolate shape outlet.

2. as the plasmatorch nozzle under the claim 1, it is characterized in that the prolate outlet of nozzle, constituted by the single hole of prolate shape.

3. it is characterized in that as the plasmatorch nozzle under the claim 1 the prolate outlet of nozzle is made of compact arranged 2～4 apertures on same axis.

4. as the plasmatorch nozzle under the claim 3, it is characterized in that the prolate outlet of nozzle is made of staggered compact arranged 3～6 apertures.