CN101191230A

CN101191230A - Surface treatment technique for coal winning machine cutting bit

Info

Publication number: CN101191230A
Application number: CNA2007101569414A
Authority: CN
Inventors: 李明
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-27
Filing date: 2007-11-27
Publication date: 2008-06-04

Abstract

The invention discloses a surface treatment technology for a cutting bit of a coal winning machine. The cutting bit is made of the 35 chrome molybdenum vanadium alloy structural steel; the surface treatment technology includes the carburizing treatment, the boronizing, molybdenum permeating and chromizing treatment in which the optimal proportioning of the ingredients in a permeating box is that the boronizing agent is 80.6 percent, the molybdenum powder is 3 percent and the chrome powder is 16.4 percent, the salt bath treatment in which the optimization proportioning of the ingredients in a salt bath furnace is that the baryta is 73 percent, the non-iodized refined salt is 22 percent and the salt bath deoxidizing agent is 5 percent and the annealing and tempering treatment. The cutting bit which is treated according to the technology of the invention has the Rockwell hardness higher than HRC62 and the service life more than 400 hours.

Description

Surface treatment technique for coal winning machine cutting bit

Technical field

The present invention relates to a kind of process of surface treatment, relate in particular to a kind of process of surface treatment of cutting tool.

Background technology

Pick is the strength member on the coalcutter, also is to consume maximum, the part of easy damage on the coalcutter.At present, traditional pick of the various models that domestic coalcutter uses generally all adopts steel alloy tungsten carbide button, its production cost height.One of its working method is to hole on the forging of forging molding, and Wimet is fixed with method for welding, again through art breading such as thermal treatments, the pick that adopts this technology to make, it is inhomogeneous and influence bonding strength to exist welding, and the crown obscission is very serious, and the life-span is not high; Another kind is to adopt the castingin pick, is to adopt to put Wimet in the casting mold die cavity, pours into a mould the once shaped of iron liquid then, but the castingin pick occurs shrinkage porosite easily, defective such as is mingled with in castingprocesses, has a strong impact on work-ing life.

Summary of the invention

Main purpose of the present invention is: provide a kind of employing structural alloy steel as base material, improve the coal winning machine cutting bit process of surface treatment in work-ing life.

Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of surface treatment technique for coal winning machine cutting bit, described pick adopts 35 chrome molybdenum vanadium alloy structure iron (35CrMoV), get material, forging forming, the metalworking typing, surface treatment is characterized in that: described surface treatment is

(1) carburizing treatment

Pick vertically is positioned over is full of the oozing in the case of carbon dust, compacting is added a cover and is sealed;

To ooze case and place in the heating car type furnace, be warming up to 650 ℃, be incubated 4-5 hour, heat then, be incubated 8-9 hour, cool to 850 ℃, and be incubated to be cooled to below 800 ℃ after 2 hours and come out of the stove to 900 ℃, be cooled to behind the normal temperature unpacking, removing pick surface impurity;

(2) boronising, molybdenum, chromium are handled

To account for the boronizing agent of component 76-82% by mass ratio, the molybdenum powder of 2-4%, the chromium powder of 15-17%, (the optimization proportioning is 80.6% boronizing agent, 3% molybdenum powder, 16.4% chromium powder) stir to be placed on and ooze in the case, will vertically be positioned over through the pick of carburizing treatment then and ooze in the case, compacting is added a cover and is sealed;

To ooze case and place process furnace, heat, be incubated 4-5 hour, heat then, be incubated 8-9 hour, and be cooled to below 800 ℃ and come out of the stove, and be cooled to behind the normal temperature and unpack, remove the pick surface impurity to 900 ℃ to 650 ℃; Soaking time length is relevant with the size of pick.

(3) salt bath is handled

In salt bath furnace, add the barium oxide that accounts for component 72-75% by mass ratio, the non-iodine refined salt of 20-24%, the salt bath reductor of 4-6% (the optimization proportioning is 73% barium oxide, 22% non-iodine refined salt, 5% salt bath reductor) stirs; Temperature in the stove is risen to 860 ℃, then the pick after handling through boronising, molybdenum, chromium is put into salt bath furnace, when to be processed temperature rises to furnace temperature, put into the quenching fuel tank, take out the cooling back;

(4) anneal

To after salt bath is handled, place in the annealing furnace by the shank of pick, and treat to take out naturally cooling when colour temperature is promptly about 500 ℃ of yellow;

(5) tempering

Pick after anneal is put into well formula tempering stove, be warming up to 180 ℃ after insulation 6-7 hour, take out naturally cooling.

Therefore, beneficial effect of the present invention is through above-mentioned surface-treated pick, its Rockwell hardness reaches more than the HRC62, Vickers' hardness reaches HV1800-2200, and pervious course thickness reaches more than the 1.5mm, and be about 140 hours the work-ing life of common employing steel alloy tungsten carbide button pick, and the present invention reached more than 400 hours, improve the work-ing life of pick, improved the working efficiency of coalcutter, saved the coal mining production cost.

Embodiment

Below by embodiment, technical scheme of the present invention is described in further detail.

Embodiment 1:

(1) be that the pick of U94 is positioned over to ooze and is placed in the case in the heating car type furnace with a kind of model, be warming up to 650 ℃, be incubated 4 hours, heat then to 900 ℃, be incubated 8 hours, cool to 850 ℃, be incubated to be cooled to below 800 ℃ after 2 hours and come out of the stove, unpack after being cooled to normal temperature, remove the pick surface impurity;

(2) above-mentioned pick is put into boronizing agent and account for 80.6%, molybdenum powder accounts for 3%, chromium powder accounts for 16.4% ooze in the case, will ooze case and place process furnace, heats to 650 ℃, be incubated 4 hours, heat then to 900 ℃, be incubated 8 hours, be cooled to below 800 ℃ and come out of the stove, unpack after being cooled to normal temperature, remove the pick surface impurity;

(3) barium oxide of adding 73% in salt bath furnace, 22% non-iodine refined salt, 5% salt bath reductor rises to 860 ℃ with temperature in the stove, then pick is put into salt bath furnace, when to be processed temperature rises to furnace temperature, puts into the quenching fuel tank, and take out the cooling back;

(4) will after salt bath is handled, place in the annealing furnace by the shank of pick, and treat to take out naturally cooling when colour temperature is yellow;

(5) pick after anneal is put into well formula tempering stove, be warming up to 180 ℃ after insulation 6 hours, take out naturally cooling.

Embodiment 2:

(1) be that the pick of U84 is positioned over to ooze and is placed in the case in the heating car type furnace with a kind of model, be warming up to 650 ℃, be incubated 4 hours, heat then to 900 ℃, be incubated 8 hours, cool to 850 ℃, be incubated to be cooled to below 800 ℃ after 2 hours and come out of the stove, unpack after being cooled to normal temperature, remove the pick surface impurity;

(2) above-mentioned pick is put into boronizing agent and account for 82%, molybdenum powder accounts for 2%, and chromium powder accounts for 16% ooze in the case, will ooze case and place process furnace, heat to 650 ℃, be incubated 4 hours, heat then, be incubated 8 hours to 900 ℃, be cooled to below 800 ℃ and come out of the stove, be cooled to behind the normal temperature and unpack, remove the pick surface impurity;

(3) barium oxide of adding 72% in salt bath furnace, 24% non-iodine refined salt, 4% salt bath reductor rises to 860 ℃ with temperature in the stove, then pick is put into salt bath furnace, when to be processed temperature rises to furnace temperature, puts into the quenching fuel tank, and take out the cooling back;

Embodiment 3:

(1) be that the pick of U95 is positioned over to ooze and is placed in the case in the heating car type furnace with a kind of model, be warming up to 650 ℃, be incubated 5 hours, heat then to 900 ℃, be incubated 9 hours, cool to 850 ℃, be incubated to be cooled to below 800 ℃ after 2 hours and come out of the stove, unpack after being cooled to normal temperature, remove the pick surface impurity;

(2) above-mentioned pick is put into boronizing agent and account for 78%, molybdenum powder accounts for 4%, and chromium powder accounts for 18% ooze in the case, will ooze case and place process furnace, heat to 650 ℃, be incubated 5 hours, heat then, be incubated 9 hours to 900 ℃, be cooled to below 800 ℃ and come out of the stove, be cooled to behind the normal temperature and unpack, remove the pick surface impurity;

(3) barium oxide of adding 74.5% in salt bath furnace, 20% non-iodine refined salt, 5.5% salt bath reductor, temperature in the stove is risen to 860 ℃, then pick is put into salt bath furnace, when to be processed temperature rises to furnace temperature, put into the quenching fuel tank, take out the cooling back;

(5) pick after anneal is put into well formula tempering stove, be warming up to 180 ℃ after insulation 7 hours, take out naturally cooling.

Claims

1. surface treatment technique for coal winning machine cutting bit, described pick adopts 35 chrome molybdenum vanadium alloy structure iron, gets material, forging forming, the metalworking typing, surface treatment is characterized in that: described surface treatment is

(1) carburizing treatment

(2) boronising, molybdenum, chromium are handled

To account for the boronizing agent of component 76-82% by mass ratio, the molybdenum powder of 2-4%, the chromium powder of 15-17% stir to be placed on and ooze in the case, will vertically be positioned over through the pick of carburizing treatment then and ooze in the case, and compacting is added a cover and sealed;

To ooze case and place process furnace, heat, be incubated 4-5 hour, heat then, be incubated 8-9 hour, and be cooled to below 800 ℃ and come out of the stove, and be cooled to behind the normal temperature and unpack, remove the pick surface impurity to 900 ℃ to 650 ℃;

(3) salt bath is handled

In salt bath furnace, add the barium oxide that accounts for component 72-75% by mass ratio, the non-iodine refined salt of 20-24%, the salt bath reductor of 4-6% stirs; Temperature in the stove is risen to 860 ℃, then the pick after handling through boronising, molybdenum, chromium is put into salt bath furnace, when to be processed temperature rises to furnace temperature, put into the quenching fuel tank, take out the cooling back;

(4) anneal

(5) tempering

2. surface treatment technique for coal winning machine cutting bit according to claim 1 is characterized in that: when boronising, molybdenum, chromium are handled, ooze in the case component and be that boronizing agent accounts for 80.6% by the quality proportioning, molybdenum powder accounts for 3%, and chromium powder accounts for 16.4%.

3. surface treatment technique for coal winning machine cutting bit according to claim 1 is characterized in that: when salt bath was handled, it was that barium oxide accounts for 73% that the component in salt bath furnace reaches by the quality proportioning, and non-iodine refined salt accounts for 22%, and the salt bath reductor accounts for 5%.