CN2260678Y

CN2260678Y - Commutator turning tool

Info

Publication number: CN2260678Y
Application number: CN 96213917
Authority: CN
Inventors: 杨俊文
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 1996-06-25
Filing date: 1996-06-25
Publication date: 1997-08-27
Anticipated expiration: 2006-06-25

Abstract

The utility model discloses a commutator turning tool, which belongs to a lathe tool and is especially used for cutting a commutator surface of a dc motor. A crystal combination artificial diamond cutter is used, and a front tool face is a plane which is at the angle gamma of 50 deg to 65 deg with a horizontal plane and is parallel to the axis of a tool bar; a main tool edge and a tool edge are symmetrical to the axle arrangement of the tool bar in the front tool face, and the included angle epsilon between two cutting edges 120 deg to 160 deg. The circular arc transition edge whose R is 0.5 to 2 mm is used, and the included angles beta 1 between the front tool face and the rear tool face and the front tool face and the auxiliary rear tool face are 80 deg to 82 deg. The turning tool had the advantages of reasonable geometric structure of a tool head, long service life, easy repair and low cost.

Description

The commutator lathe tool

The utility model relates to a kind of commutator lathe tool, belongs to lathe tools, is specifically designed to machining is carried out on the commutator surface of direct current generator.

Domestic many in the past use carbide-tipped lathe tools are processed commutator.Carbide-tipped lathe tool, wearability is good, low price.But because cutter and workpiece material easily bond, impact flexibility is low, so the commutator surface smoothness that processes is low, can not satisfy job requirement.In order to improve the surface smoothness of commutator, at present Japan, Germany commutator lathe tools of import at random that adopt more.This lathe tool is shown in Fig. 6,7, and blade 1 is made for natural diamond, is mechanically fastened on the knife bar 2, and rake face is a horizontal plane, and cutting edge is a circular arc line, relief angle α=8 °.The natural diamond tool surface is highly polished, and is little with the coefficient of friction of non-ferrous metal, is difficult for bonding, can guarantee the surface smoothness of processed commutator.But because commutator is to be pressed into by the copper sheet that accompanies mica in the middle of blocks of, the groove that is uniformly distributed along the circumference is being arranged axially, forming shock point one by one during cutting, directly blade is being impacted, blade is crumbled, lathe tool can not keep sharp for a long time.Rounded cutting edge radius greatly also is that blade keeps short reason of sharp time, causes service life of this lathe tool only about 20 hours.In addition, this lathe tool costs an arm and a leg, and is difficult for reconditioning.

It is reasonable that the purpose of this utility model provides a kind of cutter head geometry, can make processed commutator surface smoothness reach requirement, and service life is long again, easily reconditioning, the commutator lathe tool that price is low.

The purpose of this utility model is to realize like this.

A kind of commutator lathe tool, have glomerocryst diamond blade, medium carbon steel knife bar, be bonded through the carbide alloy transition zone, rake face is a plane that is parallel to the knife bar axis that becomes ° angle, γ=50～65 with horizontal plane, major cutting edge and auxiliary-blade are symmetrical in knife bar in rake face axial arranged, the arc transition sword of r=0.5～2mm is adopted in angle ε=120 between two blades °～160 °, and rake face and back knife face, rake face equate β=β with angle between the minor flank ₁=80～82 °.Rake face becomes 50 °～65 ° angle lappings to arrange that tiltedly the formed percussion of commutator copper sheet is on rake face during cutting with horizontal plane, point of a knife and blade are protected.Major and minor blade adopts roundlet arc transitional edges, has also increased cutting edge and has kept the sharp time.

Below the knife bar V-type surface that constitutes by two planes that are parallel to the knife bar axis respectively, fashionable dress fastening easy to use position.

Introduce embodiment of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the three-dimensional structure diagram of the utility model commutator lathe tool.

Fig. 2 is that the A of Fig. 1 is to view.

Fig. 3 is that the K of Fig. 2 is to view.

Fig. 4 is the B-B cutaway view of Fig. 3.

Fig. 5 is the C-C cutaway view of Fig. 3.

Fig. 6 is the side direction view of natural diamond commutator lathe tool in the prior art.

Fig. 7 is the vertical view of Fig. 6.

Shown in Fig. 1-5, the utility model commutator lathe tool is by glomerocryst diamond blade 1,45 ^# Steel knife bar 3 is bonded through carbide alloy transition zone 2.Rake face is a plane that is parallel to knife bar 3 axis that becomes ° angle, γ=60 with horizontal plane.Major cutting edge and auxiliary-blade are symmetrical in knife bar 3 in rake face axial arranged, and the arc transition sword of r=2mm is adopted in angle ε=120 between two blades °, and rake face and back knife face, rake face equate β=β with angle between the minor flank ₁=82 °.Below the knife bar 3 the V-type surface that constitutes by two planes that are parallel to knife bar 3 axis respectively, the angle theta between two planes=120 °.

The commutator lathe tool is installed on the knife rest of lathe, the axis normal of knife bar 3 is in processed commutator axis, and point of a knife is positioned at commutator axis or axis with upper/lower positions.During turning, the impact of commutator copper sheet is born by rake face, and major cutting edge is mainly finished cutting, and blade can keep sharp in a long time.In addition, the actual proof of using: the easy reconditioning of this lathe tool, the surface smoothness of the commutator that processes after refacing still can reach requirement.

The advantage that the utility model is compared with prior art had is: the cutter head geometry is reasonable, the commutator surface smoothness height that processes, and the lathe tool long service life is without service life of reconditioning being 20～50 times of existing natural diamond lathe tool.Easily reconditioning, the commutator that processes after refacing still can meet the requirements of surface smoothness.Price is low, only is about 1/8 of existing natural diamond lathe tool.

Following table is to use the utility model commutator lathe tool and the natural diamond commutator lathe tool parameter comparison table of the prior art that obtains through reality.

	Price (unit)	Process the commutator surface smoothness	Service life (hour)	The commutator surface smoothness that processes after the reconditioning
	Price (unit)	Process the commutator surface smoothness	Service life (hour)		The utility model commutator lathe tool	500	Δ7	400～1000	Δ7
Natural diamond commutator lathe tool	4000	Δ7～Δ8	20	＜Δ5	The utility model commutator lathe tool	500	Δ7	400～1000	Δ7

Claims

1. commutator lathe tool, have glomerocryst diamond blade, medium carbon steel knife bar, be bonded through the carbide alloy transition zone, it is characterized in that: rake face is a plane that is parallel to the knife bar axis that becomes γ=50 °～60 ° of angles with horizontal plane, major cutting edge and auxiliary-blade are symmetrical in knife bar in rake face axial arranged, angle ε=120 between two blades °～160 °, adopt the arc transition sword of r=0.5～2mm, rake face and back knife face, rake face equate β=β 1=80 °～82 ° with angle between the minor flank.

2. lathe tool according to claim 1, it is characterized in that described knife bar below be the V-type surface that constitutes by two planes that are parallel to the knife bar axis respectively.