CN100358662C

CN100358662C - Technique of intermediate frequency braze welding bore bit

Info

Publication number: CN100358662C
Application number: CNB2004100205101A
Authority: CN
Inventors: 康定松
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-01
Filing date: 2004-05-01
Publication date: 2008-01-02
Anticipated expiration: 2024-05-01
Also published as: CN1689744A

Abstract

The present invention relates to a technological method for brazing a bore bit in metallurgy industry and mine industry. A brazing induction heating device is used for brazing hard alloy on the bore bit, and a high-frequency bore bit brazing method is changed into an intermediate-frequency bore bit brazing technological method. The technological method adopts an intermediate power generator set or a silicon controllable intermediate power supply device, and the current frequency of brazing the bore bit is controlled from 1000 to 8000Hz. The heating is uniform by adopting the technology of the technological method, and the brazing quality, particularly the welding quality of a large-diameter bore bit is obviously enhanced. The intermediate brazing heating device has the advantages of large capacity and strong overload bearing capability. Intermediate frequency electromagnetic waves have no influence on a human body and a communication network. The technological method has low requirement for cooling water quality, and the maintenance cost is low.

Description

The process of intermediate-frequency braze welding bore bit

Technical field

The present invention relates to smelting, mine industry soldering bore bit technical field, particularly use brazing device carbide filler to be welded in the process of bore bit.

Background technology

Use the bore bit in the drilling tool at present in metallurgy, the mine industry, its process all adopts the process of high-frequency induction heating soldering bore bit, when promptly heating in the electromagnetic field of high frequency, utilize the scolder of fusion that the metal of two kinds of materials is connected, usually power frequency is 125～250 kilo hertzs of sesames, adopt the process of high frequency brazing bore bit to have following defective: high-frequency apparatus produces high-frequency electromagnetic wave excitation has damage for operating personnel's health, and aircraft, communication are had considerable influence; The high frequency power transmitting tube is the glass bulb utensil, must be demineralized water to the requirement of quality of cooling water, so water treatment expense height; The high-frequency apparatus single-machine capacity is little, and it is poor to bear overload capacity, and appliance component is fragile, the maintenance cost height; High-frequency heating frequency height, the depth of current penetration is little, when heating heavy in section bore bit, heat inhomogeneously, the top layer is easy to be crossed thermal oxide and produces top layer oxidation obscission, and the centre scolder is difficult for fusing, and the melting solder leakage easily takes place in the position, edge, influences the bore bit product quality.

Summary of the invention

The objective of the invention is to overcome the defective that the process of high frequency brazing bore bit exists, utilize brazing device, adopt the intermediate-frequency braze welding heating process, solved the carbide alloy edge preferably to the homogeneous heating at center and the homogeneous heating problem of carbide alloy and bore bit, the welding quality of drilling tool is significantly improved.

Process of the present invention is to use the soldering induction heating apparatus that carbide filler is welded in the process of bore bit, and the core of technical scheme is to adopt the intermediate-frequency braze welding heating process.From the operation principle of bore bit induction brazing, bore bit is a ferromagnetic material, and magnetic conductivity is better, and firing rate is fast; Critical piece on the bore bit is a hard alloy cutter, and the hard alloy cutter magnetic conductivity is poor, firing rate is slow, reduce the internal stress and the crackle of carbide alloy, bore bit and carbide alloy are wanted homogeneous heating simultaneously on the one hand, need to adopt less unit power, carbide alloy also needs homogeneous heating from the edge of inductor to the centre on the other hand, and the present invention selects for use intermediate-frequency braze welding bore bit process can satisfy above-mentioned requirements simultaneously.

The intermediate-frequency braze welding heater adopts intermediate frequency generator group or thyristor intermediate frequency electric source device, and the power frequency of soldering bore bit is controlled at 1000～8000 He Zhi.By to the cleaning oil removing of bore bit and carbide alloy, dry, smear welding agent, place scolder, the bore bit that will handle at last is placed in the Frequency Induction Heating coil, through energising, heating and melting, finish brazing process.The Frequency Induction Heating coil should adapt with the shape and size of bore bit, and the gap of inductor inwall and bore bit should generally about 10mm, flow on the inductor with the scolder that prevents to melt greater than 5mm.Inductor is generally formed also and can be made up of multi-thread circle by unicoil, and inductor can be formed single head, also can form double end or bull, is determined by the kind and the mode of production of product.

During the bore bit soldering of major diameter bore bit φ 50～70mm, can earlier inductor be placed on below the carbide alloy bottom, make the bore bit preheating after the heat conducting effect that excess temperature makes progress, make bore bit centre temperature give than without the bottom heat temperature much higher, at this moment again bore bit is placed the position of carbide alloy and is moved to inductor.The time of giving the solder fusing at the scolder at major diameter bore bit center, heat back and position, edge through the bottom accomplishes roughly synchronously like this, so the quality of soldering can be guaranteed.

The present invention compares with high frequency brazing bore bit process has following advantage:

1, middle frequency electromagnetic waves does not all have influence to human body and communication network;

2, intermediate-frequency braze welding heater place capacity is big, and it is strong to bear overload capacity, homogeneous heating, and the brazing quality particularly welding quality of major diameter bore bit significantly improves;

3, less demanding to quality of cooling water, maintenance cost is lower.

Embodiment

Below by specific implementation method the present invention is elaborated:

With cruciate flower bore bit, manual soldering is that example describes intermediate-frequency braze welding bore bit process.

1, earlier bore bit and carbide alloy are placed on cleaning and oil removing in gasoline or the nitro solvent, put into the drying box oven dry again, dry 80 ± 10 ℃;

2, place at bore bit and smear the pasty state welding agent that 1: 1 dewatering borax and boric acid add the absolute alcohol modulation again on the bottom land of carbide alloy and the cell wall;

3, smearing placement ormolu scolder on the bore bit bottom land of welding agent, then tungsten-cobalt hard alloy is inserted in the groove, smear welding agent above the carbide alloy again and place scolder;

4, the bore bit that will handle is placed in the Frequency Induction Heating coil, energising, heating and melting, finishes brazing process.

5, after good bore bit cooling to be brazed is located, should remove the welding agent on bore bit surface immediately, again bore bit be put into incubator, reduce thermal stress, continue slowly cooling.

Select BPS-100-8 type mechanical type frequency conversion unit and DGF-C-82 type mid frequency induction hardening control appliance for use, power frequency adopts 8000 He Zhi, provides following technological parameter:

Intermediate-frequency braze welding bore bit process parameter table

Kind	The intermediate frequency generator parameter				The intermediate-frequency transformer turn ratio	Heat time heating time (second)
	The intermediate frequency generator parameter						Voltage of intermediate frequency	Electric current of intermediate frequency	COSφ	Exciting current
	φ 32mm bore bit double end inductor	600V	55A	Lag behind 0.96			Voltage of intermediate frequency	Electric current of intermediate frequency	COSφ	Exciting current	08A	26/1	46～49
φ 40mm bore bit double end inductor	φ 32mm bore bit double end inductor	600V	55A	Lag behind 0.96	750V	90A	Lag behind 0.97	0.8A	26/1	53～63	08A	26/1	46～49
φ 40mm bore bit double end inductor	φ 60mm bore bit single head inductor	650V	150A	Lag behind 0.9	750V	90A	Lag behind 0.97	0.8A	26/1	53～63	2.5A	26/1	80～90
φ 70mm bore bit single head inductor	φ 60mm bore bit single head inductor	650V	150A	Lag behind 0.9	700V	80A	Lag behind 0.97	1A	26/1	142～145	2.5A	26/1	80～90

Claims

1, the process that is used for metallurgical mine industry intermediate-frequency braze welding bore bit, be to adopt intermediate frequency generator group or thyristor intermediate frequency electric source device, the bore bit of handling is placed in the Frequency Induction Heating coil, carbide filler is welded in the process of bore bit through energising, heating and melting, the shape and size that it is characterized in that Frequency Induction Heating coil and bore bit adapt, and the gap of inductor inwall and bore bit is 5～10mm.

2, in accordance with the method for claim 1, it is characterized in that selecting for use mechanical type frequency conversion unit and mid frequency induction hardening control appliance, for diameter is the bore bit of 32～70mm, power frequency is 8000 hertz, Control of Voltage is at 600～750V, electric current 55～150A, exciting current 0.8～2.5A, the intermediate-frequency transformer turn ratio 26/1, be 46～145 seconds heat time heating time.

3,, when it is characterized in that the bore bit soldering for 50～70mm diameter, earlier inductor is placed the carbide alloy bottom to make the bore bit preheating according to claim 1 or 2 described methods.