CN104646951A - Machining method of boiler barrel hanger rod - Google Patents

Abstract

The invention relates to the field of machining, in particular to a machining method of a boiler barrel hanger rod. The machining method includes the following steps: conducting lofting according to the drawing and drawing the hot lines; pasting the anti-oxidant paint in the blank heating area, wherein the hanger rod threaded area is already machined so as to be painted with the fire clay for preventing damage of the threads during heating; heating, wherein the thermal couple is fixed and bundled with iron wire firstly, the hanger rod is heated at 940 DEG C to 950 DEG C, but the temperature shall not exceed 950 DEG C, the final bending temperature is larger than or equal to 800 DEG C when the blank is heated, the blank must be placed horizontally through a support, the sample is heated with the boiler, the three supporting points in the boiler are used for supporting a work piece during heating, and the two hanging points are heated at the position of 1.3m from the two ends during lifting; and conducting hot bending, bending the work piece through a grinding tool special for drilling and controlling the final bending temperature. The machining method of the boiler barrel hanger rod is simple in machining process, reduces the machining difficulty, ensures the machining quality of work pieces, reduces the production cost and improves the production efficiency.

Description

Drum suspension rod processing method

Technical field

The present invention relates to field of machining, be specifically related to drum suspension rod processing method.

Background technology

Drum suspension rod bending radius in subcritical boiler: R985mm ~ R1200mm, what bending method adopted is hot bending between normalizing.The processing method of current employing is the Process adopting temperature curved, and namely the flexure temperature of workpiece is 650 DEG C; After workpiece bows part being carried out on heating furnace be heated to 650 DEG C, bend on bending apparatus with corresponding mould, find after bending curved after the very large and more difficult control of rebound value of workpiece resilience.

Summary of the invention

In order to solve the problem, the invention provides a kind of process simple, reduce difficulty of processing, ensure workpiece processing quality, reduce production cost, the drum suspension rod processing method of enhancing productivity.

Drum suspension rod processing method of the present invention, comprises the following steps:

The first step, by figure setting-out, draws heater wire;

Second step, is coated with anti-oxidation paint in the blank thermal treatment zone, and suspension rod threaded portion has processed so threaded portion also should prevent from damaging screw thread during heating by native fire clay;

3rd step, heating, first tied up by fixing for thermocouple iron wire, then suspension rod heats 940 DEG C-950 DEG C, but must not more than 950 DEG C, when curved temperature >=800 DEG C blank heats eventually, must set level with bracket, sample heats with stove, during heating, three fulcrums are added for supporting workpiece in stove, during lifting, two each 1.3 meters of heating apart from two ends of suspension centre;

4th step, hot bending, adopts brill grinding tool curved workpieces, and controls curved temperature eventually;

5th step, curved school, ensures curved temperature eventually, locates immediately after suspension rod is curved with locator card, in placely it is made naturally to cool, must cool≤200 DEG C after mould unloading, elbow is drawn to sample and plays curved line, whole curved line, symmetrical center line, and inside and outside each line elbow line-transect on each stroke of both sides, and use fire-resistant pen, or locate with fixture block.

6th step, timeliness, curved rear suspension bar is transported together with support, and protects at suspension rod threaded portion antioxidizing paint, sets level workpiece, and pad is steady, prevents workpiece deformation;

7th step, quenching, tempering, after the insulation of suspension rod Quench heating terminates, quick tapping quenches, with base metal test specimen and frock together oil cooling during quenching.

Process of the present invention is simple, reduces difficulty of processing, ensures workpiece processing quality, reduces production cost, enhances productivity.

Detailed description of the invention

Drum suspension rod processing method of the present invention, comprises the following steps:

The first step, by figure setting-out, draws heater wire;

Second step, is coated with anti-oxidation paint in the blank thermal treatment zone, and suspension rod threaded portion has processed so threaded portion also should prevent from damaging screw thread during heating by native fire clay;

3rd step, heating, first tied up by fixing for thermocouple iron wire, then suspension rod heats 940 DEG C-950 DEG C, but must not more than 950 DEG C, when curved temperature >=800 DEG C blank heats eventually, must set level with bracket, sample heats with stove, during heating, three fulcrums are added for supporting workpiece in stove, during lifting, two each 1.3 meters of heating apart from two ends of suspension centre;

4th step, hot bending, adopts brill grinding tool curved workpieces, and controls curved temperature eventually;

5th step, curved school, ensures curved temperature eventually, locates immediately after suspension rod is curved with locator card, in placely it is made naturally to cool, must cool≤200 DEG C after mould unloading, elbow is drawn to sample and plays curved line, whole curved line, symmetrical center line, and inside and outside each line elbow line-transect on each stroke of both sides, and use fire-resistant pen, or locate with fixture block.

6th step, timeliness, curved rear suspension bar is transported together with support, and protects at suspension rod threaded portion antioxidizing paint, sets level workpiece, and pad is steady, prevents workpiece deformation;

7th step, quenching, tempering, after the insulation of suspension rod Quench heating terminates, quick tapping quenches, with base metal test specimen and frock together oil cooling during quenching.

Claims (1)

1. a drum suspension rod processing method, is characterized in that, comprises the following steps:

The first step, by figure setting-out, draws heater wire;

Second step, is coated with anti-oxidation paint in the blank thermal treatment zone, and suspension rod threaded portion has processed so threaded portion also should prevent from damaging screw thread during heating by native fire clay;

3rd step, heating, first tied up by fixing for thermocouple iron wire, then suspension rod heats 940 DEG C-950 DEG C, but must not more than 950 DEG C, when curved temperature >=800 DEG C blank heats eventually, must set level with bracket, sample heats with stove, during heating, three fulcrums are added for supporting workpiece in stove, during lifting, two each 1.3 meters of heating apart from two ends of suspension centre;

4th step, hot bending, adopts brill grinding tool curved workpieces, and controls curved temperature eventually;

5th step, curved school, ensures curved temperature eventually, locates immediately after suspension rod is curved with locator card, in placely it is made naturally to cool, must cool≤200 DEG C after mould unloading, elbow is drawn to sample and plays curved line, whole curved line, symmetrical center line, and inside and outside each line elbow line-transect on each stroke of both sides, and use fire-resistant pen, or locate with fixture block;

6th step, timeliness, curved rear suspension bar is transported together with support, and protects at suspension rod threaded portion antioxidizing paint, sets level workpiece, and pad is steady, prevents workpiece deformation;

7th step, quenching, tempering, after the insulation of suspension rod Quench heating terminates, quick tapping quenches, with base metal test specimen and frock together oil cooling during quenching.