CNC Knowledge: How to effectively resolve the difficulties in treating high diameter end speed plates?

This document deals with the treatment of dental parts of large diameter end plates, improves the process path, optimizes the finishing method and packaging and transport requirements, eliminates negative factors and solves problems of deformation and low precision during the processing process.

The end speed disc (see Figure 1), also known as multi-dent disk, fine speed disc or mouse disk, is a precision indexing positioning element with an automatic centering function And is widely used in machining centers, flexible units, the CNC tools, combined machine tools, measurement instruments, various high-precision intermittent circumstantial indexing devices, multi-station positioning mechanisms and other equipment that require precise indexing, such as multi-station CNC tool holders in CNC lathes, CNC for factories and CNC machining centers in CNC LATHE The end speed disc is used as a precise positioning element In the rotary workbench and other indexing devices. The end speed disc is actually equivalent to a pair of clutches with the same number of teeth, and the mesh process is similar to that of the clutch. The dental shapes of the end speed disc are divided into two types: straight teeth and curved teeth.

Figure 1 End speed disc

01

Treatment of the high diameter end speed plate

Large diameter dental plates generally have a diameter of> 500 mm, with a number of teeth exceeding 144, generally 360 teeth. The greater the diameter of the part of the room, the more difficult it is, the more difficult it is to grind and machining. The basic principles of the design of large diameter dental plaque technology are: Reduce treatment errors and guarantee the accuracy of treatment;

For high diameter end speed discs, in particular those which have a diameter> 500 mm, since factors such as thermal treatment and residual stress in the processing process will cause deformation of the reference surface From the part or related parts, parts of the part are often selected, and the heat treatment is generally used, the procedure method is to dip + nitrative. The process route is: Forging → Thermal treatment (RECUIT) → Roaring carriage → Thermal treatment (temperature) → Semis-finish → Flat roar → Dentry leaks → CLAT Machine (cavity) → Thermal treatment (Low temperature aging) → Grinking external → flat grinding → round and exterior round grinding → coarse and semi-finished teeth → thermal treatment (nitrade) → flat grinding → round and exterior round grinding → clamp machine (grain reference surface) → fine grinding teeth.

02

Difficulties in finishing the dental parts of the large diameter end plate

The grinding and finishing of the teeth of the final dial of the final dial have always been a technical difficulty, in particular the grinding of the large diameter’s final dial disc is particularly obvious. Due to the large diameter of the part, the deformation will be present at various degrees during the processing process, which will be difficult to adjust, which will affect the precision of the part. In addition, during the grinding of a high diameter end speed disc, the tooth part of the dental plaque and the grinding wheel have a large contact area, and the grinding wheel will cause a knife phenomenon, which will wear out quickly, which will easily cause the part to produce a division error. Consequently, the key to grinding the large diameter end plates is to reduce system errors and thus improve machining accuracy.

When grinding teeth, the precision level of the gear disc in the indexing device used must be higher than the level of design of the speed disc part. The entire teeth grinding process is carried out in a constant temperature room of 20 ℃ ± 5 ℃, and there should not be a vibration in the workplace or no strong impact of the hot air flow and cold. In addition, in order to facilitate manufacturing and ensure the best mesh performance of paired gear discs, paired speed discs must be treated on the same equipment with the unchanged dental angle and paired speed discs must be marked.

03

Teeth finishing process method

The finish of the teeth of the large diameter end plate should focus on the following aspects.

1) Check the tooltip before grinding the teeth to eliminate system errors. Check the lubrication of the tool machine, check the lubrication state of each oil hole and the guide rail to make sure that the tool-tool does not crawl during operation; Before grinding the teeth, the tool-tool must operate air for more than 2 hours to make the machine-tool stable and reliable performance, ensuring the machining accuracy of the speed plate.

2) Selection and appropriate cutting of grinding wheels. The key to grinding dental forms is the wear resistance of the grinding wheel and the form of the tooth shape. The grinding wheels used for grinding should have the characteristics of: small wear and good lifespan;

Due to the size of the high diameter end speed disc and many teeth, the choice of the grinding wheel is very important. After years of exploration and a summary of practical experience, the crushing wheels of the white Corindum with soft and Auto-Sharp medium properties are generally preferred. During the grinding process, the grinding wheel must be cut frequently to make sure that the grinding wheel is sharp and to avoid the knife cut phenomenon. In addition, the grinding wheel must use different particle sizes depending on the coarse grinding requirements, semi-finished grinding and fine grinding to ensure that each treatment step meets the requirements of the model and process. In general, 46 # is used for coarse grinding, 60 # is used for semi-finish grinding and 100 # or 120 # the size of the particles is suitable.

3) The key is to find the tools and the lights. Due to the large size of the room and the adjustment difficulty, the number of fixes must be minimized, which requires solid basic skills. Wipe the machine’s contact surface and the tool fixings properly.

4) Crampting of parts. Before tightening the parts, you should pay attention to the elimination of various influence factors, such as there is a bump on the reference surface of the room, if there are burrows, and check if the Contact zone between the speed plate and the tool light reaches more than 90%.

5) Selection of the grinding margin and process control. The most difficult thing to grind the tooth part of the large diameter end plate is to ensure the precision of the division of plates and repeatability. Therefore, the grinding treatment allowance must be allocated reasonably. In general, the restraint capacity of the dental surface before the tooth part is refined and the grinding is 0.05 to 0.10 mm, and it is selected according to the shape and size of The room. The quantity of nitrid’s hard tooth disc to be held relatively small before grinding to guarantee the final thickness of the hardened layer on the surface of the room.

The teeth measurement method when grinding teeth is the same as when grinding teeth. adjusted to guarantee this requirement.

6) Control of the teeth grinding process. After doing the above steps, you must choose a reasonable tool capacity and operating speed. During grinding, avoid heavy grinding, as it is easy to cause the tool, and the grinding wheel wears out quickly, causing a large grinding volume in the first half of the room and a small grinding volume in the second half. A large amount of tools will also generate a lot of grinding heat, which will cause dental plaque deformation, which means that the accuracy of indexing dental plaque and the repetition accuracy do not meet the requirements. In order to guarantee the precision of machining of the dental plaque, dental grinding generally adopts the method of grinding training of the equal cycle, that is to say continuous grinding, then feed the tool, then indexing continuously it grinding the shape of the whole tooth. This can allow the part to obtain higher machining precision and essentially eliminate the impact of the deformation.

04

Storage and packaging and transport of teeth after the finish

In order to prevent the workpiece from deforming and affecting indexing and the repeated positioning accuracy of the gear disc, the end speed disc large diameter will be inspected by a full -time inspector after the end. After having successfully passed the inspection, make twinning marks. First use cotton cotton petrol in petrol n ° 180 to wipe the anti-rail parts. No rust, dirt or oil spots. Use the brushing method to apply anti -ist oil (lubrication), the coating must be uniform and continuous, and there should not be bubbles or missed coating. After applying anti -ist (greasy) oil, place it flat on a special packaging support. Cover the sodium benzoate anti -ist paper, pay attention to the anti -ist paper wax to the outside and should not be used. During the packaging, the gear discs are generally meshed in pairs and stored, then gradually attached along the interior and exterior circles with anti -ist paper, placed flat and fixed in the packaging box.

05

Conclusion To buy imported high diameter end-up speedboats to buy, please consult: 135 2207 9385

Due to large diameter end plates, due to their large and high precision requirements, their treatment has always been a difficult problem; Thanks to the design of treatment technology, this article solves the problems of easy deformation, low division precision and repetition accuracy when processing the large diameter end speed discs, which will improve the precision indicators Nationally large functional components and will improve market competitiveness.