Machining a CV joint – full of intermittent challenges!
02:22


One of the most vital parts in the drive line on a front wheel driven car, and some rear driven cars with individual suspension, is the CV joint. The design of the component makes it possible to keep a constant velocity of the drive wheel regardless of steering angle of the wheel, hence the name – CV joint. There are two main types – the inner CV joint which is the one closest to the gearbox and the outer CV joint closest to the wheel hub.

Focus in this post is on the outer CV joint which contain three main parts that are all hard turned and contain very heavy interruptions. Machining of the housing has been shown in an older post https://cbnexpert.blogspot.se/2016/02/secomax-ch3515.html.



One of the latest successes we have on these components is on the ball cage where we tripled the tool life. We lost 8s of cycle time but that was not a problem at this customer. The increase in tool life was valued much higher by the customer.

For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.




Author:
Stefan G Larsson Fritz
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340572
Mobile +46761367807
email:stefan.g.larsson@secotools.com

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Secomax™ The HPT grade chain
23:00

It can be difficult to define application area just by looking at a drawing


It isn´t just the level of interruptions that’s defining an application area. It´s many other process factors that will affect the choice of PCBN grade. A drawing on the finished part explains just the properties of the component. Factors like Machine tool, clamping, workpiece stability, variations from the green turning, workpiece stability, etc. are factors that actually can “move” an application from what on the drawing looks like a H05 application to a H15 and in some extreme cases from H05 to H25.


 Example: Large variation from the green turning on a Pinion “moved” the application from what on the drawing looked as a H05 to in the reality a H25 application. (From CH0550 to CH2540)





















For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.



Author:
Per Ola Jönander
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340818
Mobile +46703163555 email:perola.jonander@secotools.com

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Positioning of grades
00:26


The premium hard part turning grade chain that have been introduced by Seco Tools cover most applications in the H05-H35 area, but for low cutting speed applications it is also complemented by the existing and well proven grades CBN010 and CBN150.

When to implement which grade is not easy to show by a simple translation table. The application and the complete setup have to be studied based on component, clamping, tooling, machine conditions and so on, to be able to decide the optimal choice of grade.

If the setup is weak, the risk of micro vibrations is bigger and therefore a tougher grade is needed. If a component has been transferred from grinding to hard turning, the component tends to be less gentle to the cutting edge at interrupted cuts. For example, holes and similar may not be designed with chamfers, which would be much more forgiving for the cutting edge and an even tougher grade is needed due to the increased stress levels at the cutting edge.

For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.




Author:
Stefan G Larsson Fritz
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340572
Mobile +46761367807
email:stefan.g.larsson@secotools.com
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CH2540 will replace CBN160C
22:50


28 standard items of CBN160C will be outgoing during 2016.

These items will be replaced by CH2540.

Outgoing date;
  •  1 pcs 2016-06-30 (low sales – will not be replaced)
  • 13 pcs 2016-10-31
  • 14 pcs 2016-12-31


Internally communicated in SECO-Change of no 11-0012.

If You have issues replacing existing CBN160C business with the successor CH2540 or some other standard grade, pls contact Your local SECO representative, or our Advanced Mtrl team.



Author:
Eva Söderberg
Administration SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340491
                        Mobile +46702784500
                        email:eva.soderberg@secotools.com
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Secomax™ CH2540
04:51

CH2540 the CBN160C successor with improved tool life


Seco has for a number of years been using CBN160C, which has been a well proven PcBN grade for interrupted cuts. (H25 application area).

CH2540 is based on a new grade platform using bimodal grain distributions, it contains 65 % cBN of submicron size with 15 µm grains added to the structure. This adds both wear resistance and toughness.

For even tougher application areas (H35 application area) CH3515 has been introduced.

Due to higher terminal conductivity compared with CBN160C, CH2540 requires higher cutting speed to achieve correct temperature in the cutting zone.

















If it´s not possible to increase the cutting speed an alternative can be to choose the grade CBN150 that with its structure and low CBN content can handle lower cutting speed and interruptions.


For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.



Author:
Per Ola Jönander
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340818
Mobile +46703163555 email:perola.jonander@secotools.com
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Secomax™ CH2540 - Wiper inserts not just for increased surface finish
06:12

The new CH2540 has bimodal grain size distribution, where fine grained cBN (1 µm) with 15 µm grains added to the structure. One advantage of this type of structure is the crack deflection that the coarser grains cause.

Implementation of wiper geometries allows for feed rates of 300 percent of what could be attained with standard inserts, while achieving the same level of surface finish.

The tough CH2540 grade has once again proven successful during these cutting conditions.

At this customer has feed rate been increased from 0.14 mm/rev to 0.40 mm/rev and tool life from 500 parts to 800 parts.

This is not just a reduction of Time in cut with 65% it is also an increased tool life with 65%.

This is a true winning solution that will give the customer a real and quick cost saving.



















For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.



Author:
Per Ola Jönander
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS AB
737 82 Fagersta, Sweden
Office +4622340818
Mobile +46703163555 email:perola.jonander@secotools.com
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Chip breaker on PCBN reduces down-time
05:25

In finishing turning of hardened steel components, where the hardness is 60-62 HRC with CBN, a chip breaker is not needed, but when the hardness is lower, problems with long chips can occur. This was the case at one customer machining components with a hardness of 50 HRC.

The solution was to use inserts with chip breaker, and chip breaking was improved, and as an added bonus tool life was also longer than with the competitor insert.

Seco Tools has been very active in the area of machining case hardened steel for many years.

After heat treatment, gearbox components like gears and shafts usually have a hardness of 60-62 HRC. During the subsequent hard turning, chip control is not a problem, the chips are brittle and will break also without a chip breaker.

When machining components with a lower hardness, there can be problems with long and stringy chips, which can scratch the surface, interfere with the tool holder and clamping or otherwise negatively impact the machining operation, increasing the need for machine stops to clean the machine.

In this case, the hardness of a shaft was only 50 HRC, and the customer had problems with chips scratching the surface. The Seco solution was to use a chip breaker insert.


With the chip breaker insert, there was no need to stop the machine and remove chips anymore, resulting in a much more trouble-free production, and reducing the machine down-time.

For more information, please contact your local Seco representative, or our Advanced material (PCBN/PCD/CERAMIC) team.

Author:
Henrik Sandqvist
Product Specialist SECOMAX PCBN/PCD/CERAMIC
SECO TOOLS Shanghai CO., Ltd. Building 4, No 797,
Puxing Road, Pujiang Town, Minhang District,
Shanghai 201114, China
Office: +86 21 5426 5849
Mobile: +86 185 1520 6942
e-mail: henrik.sandqvist@secotools.com


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