Grade 7 Gear Hobbing Finish 0.8 Precision Machining Casting 42CrMo Material 160kg

Introduction for grade 7 gear hobbing Finish 0.8 precision machining casting 42CrMo as material 160kg

The grade 7 precision of the gear requires grinding;

For non-hardened gears with an accuracy of 6 to 7, the gear machining solution: hobbing and shaving.

For hardened gears with an accuracy class of 6 to 7, there are generally two tooth profile machining options:

Shaving honing solutions: rolling (insertion) teeth - tooth end machining - shaving - tooth resurfacing - bore correction - caries.

Grinding fluid: rolling (insertion) teeth - tooth end machining - tooth surface hardening - correcting holes - grinding teeth.

The shaving extrusion solution has high productivity and is widely used in the mass production of grade 7 precision gears. Low productivity of grinding solutions, typically used for gears with an accuracy of 6 or better

The accuracy of the three-tolerance group of the gear is 7, the upper tooth thickness deviation is f, and the lower tooth thickness deviation is l. 7-6-6 gm: The gear tolerance zone is grade 7, the gear tolerance zone is grade 6, the gear tolerance zone is grade 6, the upper tooth thickness deviation is g grade, and the lower tooth thickness deviation is m grade

Discuss the 6-level and 7-level precision gear machining process plan.
Level 7: shaving-honing scheme: rolling (placing) teeth - tooth end processing - shaving - surface quenching - correction benchmark - honing
Level 6: Grinding scheme: rolling (pinching) teeth - tooth end processing - carburizing and quenching - correction benchmark - grinding

In the field of processing and manufacturing of gear transmissions, the requirements of complete vehicle manufacturing for gear transmission noise and reducing manufacturing costs are also increasing. The traditional gear hobbing-tooth-shaving heat-treatment-light honing process has certain limitations and cannot meet this requirement. . If the hard tooth surface is used to grind the teeth, and then the method of honing is used, the processing and manufacturing cost is too high. The emergence of powerful gear honing technology provides a high-performance hard tooth surface processing technology for the processing and manufacturing of gears.

The seven-level precision gear needs various means such as rough turning, fine turning, car washing and grinding in the processing process, among which fine turning is the most important. Professional high-precision gear processing methods and processes are an important basis for ensuring product quality and work efficiency. This has higher requirements on the precision of processing machinery.

Maanshan Kingrail supply various gears as per customer request

Non-standard gear customization is non-standard gear. Standard gear - module, pressure angle, tip height coefficient, tip clearance coefficient, all are standard values; the pitch circle tooth thickness is equal to the tooth slot width.

Besides the above casting gears, Kingrail also supply forging gears

The powder forged blank is a sintered body or an extruded blank, or a blank obtained by hot isostatic pressing. Compared with ordinary billet forging, powder forging has the following advantages;

1. High utilization rate of materials

The powder forged gear adopts closed die forging, the forging has no flash, no material loss, and the allowance for subsequent machining is small. From powder raw materials to finished parts, the total material utilization rate can reach more than 90%.

2. High molding performance

Metals or alloys that are generally considered unforgeable, such as hard-to-deform high-temperature casting alloys, can be forged into products with complex shapes by powder forging, and forgings with complex shapes can be easily obtained.

3. High performance of forgings

The powder forging preform is heated by non-oxidative protection, and the precision and roughness after forging can reach the level of precision die forging and precision casting. Preform shapes can be used to finalize forgings with complex shapes.

4. High mechanical properties

Since the powder particles are formed by the rapid condensation of trace amounts of liquid metal, and the composition of the metal droplets is almost identical to that of the parent alloy, the segregation is confined within the powder particles. Therefore, defects such as casting segregation and coarse and uneven grains in ordinary metal materials can be overcome, so that the material is uniform and free of anisotropy.

5. Low cost and high productivity. The raw material cost and forging cost of powder forgings are similar to those of general die forgings. Compared with single-core general die forgings, the dimensional accuracy is high, the surface roughness is low, and it can be processed less or not, thus saving the follow-up. supporting equipment and working hours.

For small parts with complex shapes and large batches, such as gears, spline bushings, connecting rods and other difficult-to-machine parts, the saving effect is particularly obvious.

Due to the easy alloying of metal powder, it is possible to design and prepare raw materials according to the service conditions and performance requirements of the product, thereby changing the traditional forging and pressing process is "processing with incoming materials", which is conducive to the integration of products, processes and materials. .
 

Welcome to send your inquiry with drawing and specification, Kingrail will offer accordingly