CN203124804U

CN203124804U - Pore broadening cutter for big-modulus large-diameter small-width gear

Info

Publication number: CN203124804U
Application number: CN 201320093292
Authority: CN
Inventors: 吴敬
Original assignee: 吴敬
Current assignee: Shenyang Institute of Technology
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2013-08-14
Anticipated expiration: 2023-03-01

Abstract

The utility model relates to a pore broadening cutter for a big-modulus large-diameter small-width gear. The problem of pore opening inaccuracy during pore opening of the big-modulus large-diameter small-width gear is solved well through the cutter, a bearing at the head of a drill extends into a processed hole with the diameter of phi32mm when the cutter is in processing, the bearing rotates in the hole with the diameter of phi32mm, the positioning effect is achieved through the design, friction is also reduced, concentricity of a concave hole of phi50mm and the hole of phi32mm is guaranteed, and a processing speed is improved simultaneously.

Description

The broad of the big little width gear of modulus major diameter

Technical field

The utility model relates to a kind of machining tool of gear hole, relates in particular to the broad of the little width gear of a kind of big modulus major diameter.

Background technology

The big little width gear parameter of modulus major diameter is: modulus M=50mm, tooth number Z=113, tip diameter da=5750mm, reference diameter d=5650mm, facewidth b=200mm, modification coefficient x=0, whole depth h=112.5mm, space width e=78.5mm, accuracy class 8HK (GB/T10095).Material 35CrMo.

On gear width one end face, 72 φ 32mm diametric hole of even circumferential arrangement are arranged, the spill circular groove of diameter phi 50mm is arranged on it, spacing is had relatively high expectations between the Kong Yukong, needs to take measures to guarantee the spacing requirement in 72 holes in the processing.Fig. 1 is the gear partial schematic diagram.

Module M=50mm is the maximum modulus of national Specification.Large module gear is characterized in that physical dimension is big.Bearing capacity is big.But modulus is more big, and the difficulty of processing of gear is more big.It is low to show as machining accuracy, and surface roughness is poor.Influence the normal use of gear.

This gear not only modulus is big, and diameter is big, and width is also less, there is serious deformation in the processing, all bring adverse effect for processing and use, when especially needing to add the hole on the work gear width one end face wheel rim after Gear Processing is finished, there is the inaccurate problem of processing in existing mode.

Summary of the invention

The utility model purpose: the utility model provides the broad of the little width gear of a kind of big modulus major diameter, its objective is that solving existing processing mode processes inaccurate problem.

Technical scheme:

The broad of the big little width gear of modulus major diameter, it is characterized in that: this cutter comprises blade and drill bit, and drill bit is arranged on the blade front end, and this drill bit head is cylinder, is coaxially installed with rolling bearing with cylinder on this cylinder.

This cutter bit diameter is φ 50mm, and the cylinder diameter of drill bit head is φ 12mm, and the size of rolling bearing is inner diameter d=12mm, D outer diameter=32mm.

Advantage and effect: the utility model relates to the broad of the little width gear of a kind of big modulus major diameter, the problem that the perforate that this cutter has existed when well having solved the perforate of the little width gear of big modulus major diameter is inaccurate, this cutter work in-process drill bit head bearing puts in the φ 32mm diametric hole that has machined, bearing rotates in the hole of φ 32mm diameter, this design both played the role of positioning, reduced friction again, guarantee the concentric of φ 50mm shrinkage pool and φ 32mm hole, improved process velocity simultaneously.

Description of drawings:

Fig. 1 is the gear partial schematic diagram.

Fig. 2 is six blade milling cutters that add work gear, and namely six swords refer to the structural representation of type milling cutter;

Fig. 3 is four blade milling cutters that add work gear, and namely four swords refer to the structural representation of type milling cutter;

Fig. 4 installs bracing ring partial structurtes schematic diagram for gear;

Fig. 5 is bracing ring overall structure schematic diagram;

Fig. 6 is the bushing plate schematic diagram;

Fig. 7 is broad schematic diagram of the present utility model.

The specific embodiment:Below the utility model is described further:

The processing method of the big little width gear of modulus major diameter, this gear blank is casting, split type structure, casting time-division two halves are cast, and then connect into full circle with bolt; Concrete grammar is as follows:

After the rough-cast moulding, carry out annealing in process, eliminate casting stress, the control distortion;

Roughing:

On floor type boring machine, each half gear is carried out roughing, roughing is carried out on each half gear blank counterpart plane, stay allowance 10mm to each half gear counterpart plane, form full circle then;

The cylindrical of the gear that roughing fits together on the vertical lathe of φ 6.3m and width both ends of the surface, diametric(al) made allowance 36mm, every made allowance 16mm of both ends of the surface.

On the gear-hobbing machine of φ 10 m the gear teeth of gear are rough milled the tooth operation, adopt the M=36mm milling cutter, divide two cuttves to carry out mill teeth, the degree of depth reaches 81mm; Mill two teeth of counterpart place symmetry earlier, the teeth groove center overlaps with the counterpart seam, mills other tooth then in order; After rough milling tooth, two and half gears that will combine are again taken two halves apart, change the semifinishing step;

Semifinishing:

On floor type boring machine, each half gear is carried out semifinishing, the two halves gear is dropped on their counterpart plane of semifinishing together at width, to per half counterpart plane made allowance 1mm; Then two and half gear trains are dressed up full circle;

The cylindrical of the whole gear of semifinishing and width both ends of the surface are stayed the 10mm surplus, every made allowance 5mm of both ends of the surface to diametric(al).

Adopt the M36mm milling cutter, divide two cuttves that whole gear is carried out mill teeth, the degree of depth reaches 81mm, and the mill teeth order is identical with rough milling tooth, and behind the half finish-milling tooth, two and half gears that will fit together are again taken two halves apart, change the fine finishining step;

Fine finishining:

On floor type boring machine, the two halves gear to be dropped on together at width, fine finishining counterpart plane reaches design size, then two and half gears is formed whole gear;

On φ 6.3m vertical lathe, fine finishining top circle and width both ends of the surface reach design size.

On φ 10 m gear-hobbing machines, utilize the milling cutter of M=50mm to divide two cuttves that whole gear is carried out the finish-milling tooth; The first cutter working depth is 110mm, stays the 2.5mm surplus, and the first cutter mill teeth mills two teeth of counterpart place symmetry earlier, then by " rice " font great-jump-forward mill teeth, to discharge stress, the control distortion; Second cutter begins mill teeth from counterpart, and by finishing whole tooth Profile Machining clockwise one by one, the second cutter mill teeth reaches dimensional requirement.

In the processing top circle in each step and both ends of the surface, all adopt support fixture that gear is supported, concrete steps are as follows: seam is installed bracing ring in each gear, bracing ring is fixed on stop portion in the gear with tommyhead bolt, adjust the tommyhead bolt on the support ring circumference, support ring and gear blank are connected as one.

The cylindrical of support ring is rolled by steel plate and forms, the inboard is welded with 24 profiles and is circular nut, the spiral shell button is T shape, the size of spiral shell button is T50 * 8mm, support ring is the radiation wire by the center 12 radial supports, is welded as a whole with cylindrical, and the inner end of 12 supportings is welded on the concentrically ringed steel plate, form a whole, the axial width of support ring is 100mm.

When gear-hobbing machine milled, used roughing and semi-finished milling cutter were four blade milling cutters, and accurately machined milling cutter is selected six blade milling cutters.

During roughing, select M=36mm four blade milling cutters, falling the cutter amount is that 0.07 ~ 0.08 mm/ changes, the cutter rotating speed is 80 ~ 85r/min, selects M=36mm four blade milling cutters during semifinishing, and falling the cutter amount is that 0.07 ~ 0.08 mm/ changes, the cutter rotating speed is 80 ~ 85r/min, select six blade milling cutters of M=50mm during fine finishining, falling the cutter amount is that 0.11 ~ 0.15 mm/ changes, and the cutter rotating speed is 80 ~ 85r/min.

After the roughing gear is carried out normalized treatment, eliminate cutting stress, improve case hardness and reach HB217-255; After the semifinishing, allow gear natrual ageing 10 days, to discharge stress.

During the processing top circle, two gears are dropped on processing together at width, the overall width that can be considered as gear like this is the rigidity that 400mm. can improve gear, prevents distortion.

Design bushing plate and broad

After gear all machined, last procedure was to add 72 φ 32mm holes on the work gear width one end face wheel rim, adopted bushing plate, with bushing plate processing 72-φ 32mm hole, saw Fig. 6.Bushing plate divides 30 ° to make one, and 6 drill bushing holes are arranged on each template, and bushing plate is elaborated, and guarantees the accurate of each size.During boring, 12 bushing plates are surrounded full circle be placed on the gear face, behind the centering, compress.Owing to do guiding with drill bushing, guaranteed the uniform accurate of 72 pitchs of holes.

Will be applied to cutter of the present utility model this step, the φ 50mm concave hole on the processing 72-φ 32mm hole is made special-purpose broad, sees Fig. 7.Bit diameter is φ 50mm, drill bit head is processed into φ 12mm cylinder, and rolling bearing, (GB/T276-1994 ball bearing are installed on it, code name 6201) size is d=12mm, D=32mm, the drill bit head bearing puts in the φ 32mm diametric hole that has machined in the processing, and bearing rotates in the hole of φ 32mm diameter, this design both played the role of positioning, reduce friction again, guaranteed the concentric of φ 50mm shrinkage pool and φ 32mm hole, improved process velocity simultaneously.

Inspection method:

By designing requirement, the detection of the gear teeth should detect base tangent length, by base tangent length detect can avoid the top circle error to the wheel teeth size influence, to stride the number of teeth by the common normal measurement be 15 to this gear as calculated, base tangent length reaches 2005.6mm, measurement has difficulties, and measure error is bigger.So adopt chordal thickness to detect.Chordal thickness is 69.35mm as calculated, and deviation is selected by the transverse tooth thickness deviation, its deviate is-0.704mm and-1.056mm.

Processing result:

This gear adopts rational process program, the manufacturing process of science, and processing effect is very good.Detect data and see Table 1.

Table 1 gear detects data

Title	Measured value mm
		Gear teeth chordal thickness	61.40~61.69
The gear radial deformation	1~1.5
		The gear teeth error of division	0.1
Tooth-face roughness	Ra 3.2~6.3(μm)

In addition, the utility model also provides a kind of bracing ring of processing top circle and both ends of the surface, this bracing ring is the ring shape structure that rolls, seam adapts in the cylindrical shape of this circle and size and the gear, be welded with the nut of a plurality of circles in the inboard of ring shape structure, nut be arranged on T shape spiral shell and buckle, T shape spiral shell button passes bracing ring, this support ring is the radiation wire by the center 12 radial supports, be welded as a whole with cylindrical, the inner end of 12 supportings is welded on the concentrically ringed steel plate, forms a whole.The size of spiral shell button is T50 * 8mm; The axial width of support ring is 100mm.

The structure of the broad of gear is as follows: this cutter comprises blade 1 and drill bit 2, and drill bit is arranged on the blade front end, and this drill bit head is cylinder, is coaxially installed with rolling bearing 3 with cylinder on this cylinder.

This cutter bit diameter is φ 50mm, and the cylinder diameter of drill bit head is φ 12mm, and the size of rolling bearing 3 is inner diameter d=12mm, D outer diameter=32mm.

Claims

1. the broad of the big little width gear of modulus major diameter, it is characterized in that: this cutter comprises blade (1) and drill bit (2), drill bit is arranged on the blade front end, and this drill bit head is cylinder, is coaxially installed with rolling bearing (3) with cylinder on this cylinder.

2. the broad of the little width gear of big modulus major diameter according to claim 1, it is characterized in that: this cutter bit diameter is φ 50mm, the cylinder diameter of drill bit head is φ 12mm, and the size of rolling bearing (3) is inner diameter d=12mm, D outer diameter=32mm.