CN2818035Y

CN2818035Y - Finger-like polished and geared hobbing

Info

Publication number: CN2818035Y
Application number: CN 200520032032
Authority: CN
Inventors: 阎建慧; 郭千世; 张升奇
Original assignee: ZHONGXIN HEAVY MACHINERY CO
Current assignee: CITIC Heavy Industries Co Ltd
Priority date: 2005-09-30
Filing date: 2005-09-30
Publication date: 2006-09-20
Anticipated expiration: 2015-09-30

Abstract

The utility model relates to a finger-like pre-grinding gear milling cutter. The utility model forms a vertical type milling cutter head with a pointed head, a broad upper part and a finger-like configuration. The upper part of the milling cutter forms a cylinder, and the interior of the upper end of the cylinder is provided with a threaded hole (1) which is connected with a cutter bar on a main shaft of a gear hobbing machine. The middle part of the milling cutter is provided with four cutting edges (2), an orthographic projection forms a conic concave arc-shaped line segment, and each point on the line segment is determined by the value of an included angle phi of each set of heights h and tangents according with design requirements. A plurality of chip breaking flutes (4) are arranged on each edge, an arc-shaped groove (3) is arranged between the two cutting edges, and the lower part of the milling cutter, namely, the head of the vertical type milling cutter, forms circular arc connection. The utility model can carry out pre-grinding processing for high-precision quenching gears with hard tooth surfaces, gear shafts and gears with different specifications and nonstandard parameters, processed gear roots have definite recessed amount, tooth roots can not have end lands, a process step of artificial thinning is decreased, manufacturing cycles of products are short and production cost is reduced.

Description

Finger-like gear cutters before the mill

Technical field:

The utility model relates to Milling Process cutting-tool engineering field, finger-like gear cutters before a kind of mill.

Background technology:

In mechanical processing industry, the specification of the specification of gear product, especially high accuracy hard flank of tooth quenching gear and gear shaft is more and more, and the profile of tooth of the nonstandard parameter of different size is more and more diversified.The requirement of its precision is more and more higher, and at present, the order of palpus state external gear is more and more, state's external gear is a pitch system, and its standard value and China's standard value do not match, and order mostly is single-piece, specification is numerous and diverse in addition, and every kind of specification carburizing and quenching gear all need be made pre-grinding hob.Because hobboing cutter manufacturing cost height, add sometimes one and only must process a gear to hobboing cutter, increased manufacturing cost greatly, in addition, the manufacturing cycle of hobboing cutter is long; Use pre-grinding hob,, easily form seamed edge, so must carry out artificial reconditioning before the carburizing and quenching, otherwise profile of tooth root generation stress is concentrated behind the carburizing and quenching, even stress cracking occurs at tooth root because hobboing cutter is that generating adds work gear.

Summary of the invention:

In order to overcome the deficiencies in the prior art, the utility model purpose provides the preceding finger-like staggered tooth side of a kind of mill, can be to high accuracy, the gear of the nonstandard parameter of hard flank of tooth quenching gear, gear shaft and different size grinds preceding processing, make the gear root that processes have certain recessed amount, tooth root portion does not have seamed edge, has reduced the operation of artificial reconditioning, the product manufacturing cycle is short, greatly reduces production cost.

For achieving the above object, the utility model adopts following technical scheme:

Finger-like gear cutters before this mill, it is that a kind of head point, top are wide, profile is as the vertical milling head of finger shape; The top of milling cutter is cylindrical, and its cylindrical upper end inside is provided with screwed hole, and screwed hole is connected with knife bar on the gear-hobbing machine main shaft; There are four cutting edges at the middle part of milling cutter, and its orthographic projection is conical concave arc shape line segment, and each point on the line segment is determined by each the group height .h that adheres to specification and the value of its tangent line included angle; Each blade is provided with several chip-breakers; Between two cutting edges arc groove is arranged; The bottom of milling cutter is that the head of vertical milling cutter is the circular arc connection.

Finger-like gear cutters before this mill, the blade of milling cutter head can be arranged to three and four blades, and each blade also can be arranged to spiral-shaped.

Owing to adopt as above technical scheme, the utlity model has following superiority:

Finger-like gear cutters before this mill can substitute pre-grinding hob the gear of the nonstandard parameter of the hard flank of tooth quenching of high accuracy gear, gear shaft and different size is carried out roughing, makes the gear root that processes have certain recessed amount; Use the preceding finger cutter of mill, tooth root portion does not have seamed edge, has reduced the operation of artificial reconditioning, satisfies the requirement of next procedure processing fully.Finger-like gear cutters processing, cutting smoothly, simple easy operating has shortened manufacturing cycle of product, especially the processing to the single-piece gear has reduced production cost; Its low cost of manufacture, the manufacturing cycle is short, has satisfied instructions for use fully.

Through feasibility study repeatedly, finger-like gear cutters and existing pre-grinding hob are example with modulus 20: its production cost: the pre-grinding hob manufacturing expense relatively before this mill: 11000 yuan/; Finger-like gear cutters manufacturing expense before the mill: 480 yuan/; Process-cycle: half a year pre-grinding hob production cycle; One month finger-like gear cutters production cycle before the mill.

Description of drawings:

Fig. 1 is a finger-like gear cutters structural representation before the mill;

As shown in fig. 1: 1-screwed hole; 2-cutting edge; 3-arc groove; 4-chip-breaker;

The specific embodiment:

As shown in fig. 1: finger-like gear cutters before this mill, it is that a kind of head point, top are wide, profile is as the vertical milling head of finger shape; The top of milling cutter is cylindrical, and its cylindrical upper end inside is provided with screwed hole (1), and screwed hole is threaded with knife bar on the gear-hobbing machine main shaft; There are four cutting edges (2) at the middle part of milling cutter, and its orthographic projection is conical concave arc shape line segment, and each point on the line segment determines that by each the group height .h that adheres to specification and the value of its tangent line included angle each blade is provided with several chip-breakers (4); Arc groove (3) is arranged between two cutting edges; The bottom of milling cutter is that the head of vertical milling cutter is circular-arc connection.The blade of its milling cutter head can be arranged to three and four blades, and each blade also can be arranged to spiral-shaped.

Want the geometric parameter size of the preceding finger cutter head of accurate Calculation mill in the design, the geometric parameter of h and φ is the key of finger-like gear cutters design before grinding among the figure, has only h reasonable in design and φ value, just can reach to use to grind preceding finger-like gear cutters purpose.

During use, if h and φ design is unreasonable, the blade geometry of finger cutter head changes before this mill, two kinds of situations are arranged when using this cutter to add work gear, and a kind of is with effective involute of the cutting flank of tooth, and effective involute is shortened, second kind is the recessed quantity not sufficient of cutting pinion, follow-up roll flute operation is difficult for, and tooth root portion has seamed edge behind the roll flute, has increased the operation of artificial reconditioning.

Claims

1, finger-like gear cutters before a kind of mill is characterized in that: described gear milling cutter, and it is the head point, top is wide, and profile is as the vertical milling head of finger shape; The top of milling cutter is cylindrical, and its cylindrical upper end inside is provided with screwed hole (1), and screwed hole is connected with knife bar on the gear-hobbing machine main shaft; There are four cutting edges (2) at the middle part of milling cutter, and its orthographic projection is conical concave arc shape line segment, and each point on the line segment is determined by each the group height .h that adheres to specification and the value of its tangent line included angle; Each blade is provided with several chip-breakers (4); Arc groove (3) is arranged between two cutting edges; The bottom of milling cutter is that the head of vertical milling cutter is the circular arc connection.

2, finger-like gear cutters before the mill according to claim 1, it is characterized in that: described gear milling cutter, the blade of its head can be arranged to three or four blades, and each blade also can be arranged to spiral-shaped.