Qingdao Vanhon Machinery Technology Co.,Ltd.

Industry News
Some Questions and Answers on Gear Cutting and Gear Manufacturing
Nov 24, 2022

. Please write down the four major advantages of the gear milling machine?


The advantages of milling gears are:

1. All types of gears i.e. spur gears, helical gears, worm gears, bevel gears can be machined and are easy to cut.

2. Rough and fine machining are easy to operate and the surface finish is good.

3. Suitable for any tooth shape

4. Low initial cost


Ⅱ. Tell me the principle of gear shaping?


The principle of shaping is the process by which an involute gear meshes with any other involute gear with the same base pitch.


Ⅲ. What are the forming methods of gear blanks?


The forming of the gear blank involves two methods. They are:

1) Machine the tooth groove of the gear with a single point tool.

2) Machining with gear cutters.


Ⅳ. What is your understanding of Gear Fancheng?


Gear generation process: i.e. any gear in full mesh. In the process, one of the gears acts as a knife. Due to the relative movement of the tool and the blank, the gear teeth are cut out.


Ⅴ. What is the difference between forming processing and generating processing?


Forming method (Forming): The cutting tool is fixed for each groove of the gear, and the tooth shape is fixed. Generating: The tool it uses is essentially a gear, and the tool and the blank rotate at the same time and mesh with each other.


Ⅵ. What are the factors affecting the geometric accuracy of cylindrical workpieces?


The geometrical accuracy of cylindrical workpieces depends on:


a) correctness of workpiece rotation,

b) the parallelism of the tool movement to the axis of the work spindle,

c) Effect of tool wear.


. Write down the advantages of gear shaping (Generating)?


The advantages of gear shaping are:


a) Using modulus-specific DP cutters, gears with the same DP modulus but different numbers of teeth can be cut precisely,

b) faster and more economical,

c) using only one tool to cut all spur gears of the same pitch,

d) Both internal and external gears can be cut.


Some Questions and Answers on Gear Cutting and Gear Manufacturing(图1)



Ⅷ. What are the main disadvantages of gear shaping?


The main disadvantage of gear shaping is that worm gears cannot be machined on a gear shaping machine.


Ⅸ. What specific types of gears can be specially processed by the gear shaping process?


It can process gears with special structures that cannot be processed by other tools, such as: stepped shaft gears, double gears and internal gears with small apertures.


Ⅹ. What is the difference between gear shapers and gear combs?



From the analysis of the principle of the gear shaping process, the gear shaping cutter is equivalent to a pair of cylindrical gears whose axes are parallel to each other. A gear shaper is essentially a gear with front and back angles and a cutting edge.


Planer teeth (comb teeth):

The rack-and-pinion cutting tool moves back and forth along the perimeter of the axial gear while the tool slowly moves toward the center until the gear tooth profile is achieved. As the workpiece rotates slowly, the tool continues to oscillate and move tangentially to the workpiece, and the distance between the tool and the axis remains constant.


Ⅺ. What are the basic conditions for gears to mesh correctly (share tools)?


The base pitches (base circle pitches) of both gears are equal.


Ⅻ. Name the different types of rolling cuts?


According to the hob feed direction classification:

a) Axial feed


b) Radial feed


c) Tangential feed


Some Questions and Answers on Gear Cutting and Gear Manufacturing(图2)

XⅢ. What are the advantages of gear hobbing?


The advantages of hobbing are:

a) The method is general and can process spur gears, helical gears, worm gears and worm gears.

b) Fast, economical and high yield.


XIV. Please give three differences between hobbing and milling?



a) Hobbing processes multiple teeth at one time.

b) It is not necessary to disengage the tool and workpiece before indexing.

c) Hobbing is faster than gear milling.


Gear milling:

a) The milling machine can only cut one tooth at a time.

b) Requires separation of tool and workpiece before indexing can occur.

c) This is a slower process compared to the gear hobbing process.

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