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4 or 6-Axis CNC Hob Sharpening Machine

KG253S / L

A Precision Hob Sharpener

Max. Workpiece Diameter
250mm
Max. Grinding Wheel Speed
6,000rpm
  • Feature
  • Specifications
  • Catalog

Typical Parts Hobbed

・ HSS Hobs
・ Carbide Hobs
・ Cermet Hobs

Grinding Lead Gash Hobs (KG253L)

The 6 axis-CNC KG253L can swivel the grinding wheel head from +/- 25 degrees, allowing the helical fluted hobs to be sharpened. Also, an optional Rotary Type NC Dresser allows CBN grinding wheel dressing. The shapes of the grinding wheels are automatically calculated by the CNC, and the dressed grinding wheels deliver highly accurate sharpening of cutting faces. For straight gash hobs, the 4 axis-CNC KG253S is available.

Automatic Setting of Grinding Wheel Offset Amount

[Hobs with a Rake Angle]
By Program input, the grinding wheel offset amount is automatically calculated and positioned depending on the hob rake angle.

[Carbide Hobs with a Negative Rake Angle]
Hobs ranging from +10 to – 45 degrees of rake angle (equivalent to +20 mm~-90 mm of the offset amount) can be mounted and sharpened. Skiving hobs that require a large negative offset amount can be easily set.

Automatic Positioning of Grinding Wheel and Hob

Prior to the sharpening process, the grinding wheel is positioned between 2 flutes of the hob by manual. The grinding wheel face is then automatically positioned against hob face to be ground.

Easy Programming

Program input is easily performed via conversation type programming. Also, a built-in PC type NC device and 10.4 inch color liquid crystal panel are utilized in the KG253L.

KG253S Input Screen
KG253L Input Screen

Specifications

  • Machine Type

    KG253S

    KG253L

    Specs

    Max. Workpiece Diameter

    250mm

    250mm

    Max. Workpiece Length

    250mm

    250mm

    Max. Gash Depth

    35mm

    35mm

    Max. No. of Index

    99

    99

    Max. Grinding Wheel Diameter

    200mm

    250mm

    Max. Grinding Wheel Speed

    6,000rpm

    6,000rpm

    Max. Index Speed

    25rpm

    25rpm

    Weight

    5,000kg

    5,000kg

    Floor Space: Length X Width X Height

    2770×1450×2175mm

    2770×1450×2175mm

Product Catalog

You can download the PDF data of product catalogs by adding the desired catalog to the list and filling out the form at each download link.

Inquiries about This Product

We are dedicated to a fast response to your request, and will make every attempt to respond in a timely manner. Requests received on Holidays or Weekends will be handled on the next business day in most cases.

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Vertical Hob Machine

Changing Fixtures, Hob Cutters or Workpieces (manual loading) is far simpler and faster than in a horizontal hobber as compared to a vertical hobber. As the workpiece /fixture are positioned vertically, they are very easy to exchange and accurately mount. The Hob Head of a vertical hobber allows great accessibility to the work table/tooling area and peripheral equipment (auto loader, transfer unit etc.) can be added without reducing operability!

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Hand Scraped Guideways

Kashifuji hand scrapes the guideways on all its hobbing machines to create a platform that dampens and absorbs the intermittent cutting forces that are inherent to hobbing process. This feature allows many years of use while still maintaining superb hobbing accuracies.

Generally, machining has limited achievable accuracies due to friction created distortions and/or internal stress relief produced during the machining process. Variations of temperature and humidity during the machine process can also reduce accuracy. Kashifuji utilizes a hand scraped surface finish to assure highly accurate guideways that are not possible by any machining/grinding process.

Hand Scraping is a finish processing method that makes the guideways extremely accurate with an ideal flatness and straightness by manually removing metal in extremely small amount (1~3 micro meters) by the use of a hand tool called a "Scraper". This hand tool has a carbide tipped single edge blade with a blunt angle. This tool is used to relieve the surface tension (create numerous, evenly distributed small, shallow dips or reliefs) in the guideway surfaces. Scraping produces a very flat surface, and the "shallow divots" retain oil which creates smooth sliding surfaces while reducing wear.

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Hand scraping is a labor intensive process. The guideway surfaces are painted with a “dye” then rubbed with a reference straight edge, the dye collects on the highspots. The highspots are then removed by “hand scrapping”. This process (applying dye, rubbing & scrapping) is continually repeated until approximately 30% of the guideway surface is “relieved” producing ~70% bearing surface. This process produces an extreme flatness.

Hand scraping is referred to as a "Master's Skill". Kashifuji's skilled craftsmen are able to make accurate micro-meter scraping marks compensating for variations caused by material or temperatures changes. The "scraping pattern" produced, is often referred to as an "art form", and is unique to each craftsman. It takes many years of tedious, difficult work to acquire the experience & skill to become an accomplished Kashifuji "Scraper".

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Zero Backlash Table(Work Table Backlash Eliminator)

Kashiufji designed and developed a hydraulically controlled split worm Work Table Backlash Eliminator.

This device creates a Zero Backlash condition for the work table under all cutting conditions. The backlash eliminator suppresses work table vibrations assuring smooth and highly accurate work table rotation. The rotational accuracy of the work table will not degrade with use, as the device is self-adjusting (maintenance-free).

The backlash eliminator allows consistency in hobbing accuracies especially when hobbing large pitch gears, hobbing with a carbide skiving hob cutter and opposite hand hobbing (lead angle of a hob cutter is opposite of the helix angle of the part).

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Automation

Numerous styles and types of auto loaders, conveyors or part stockers are available for automatic part transfer. All loader design are labor saving and increase efficiency.

Basic 2-Arm Auto Loader(KN80, KN152)

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Basic Ring Loader
(KE201/251、KA220/400)

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Transfer Example for Flat Gears

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Transfer Example for Flat Gears

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Transfer Example for Shaft Gears

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Transfer Example for Shaft Gears

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In-machine chamfering unit (optional specifications)

<Stock removal process using a chamfering cutter>
The use of an auto part loader device enables chamfering and deburring during the hobbing process. By effectively using the open space of the machine and by making the chamfering tool axis and the deburring tool axis independent, it is easy to change / adjust the tooling from the machine front operation side. In addition, the combination of hobbing, chamfering and deburring reduces the line length and cycle time.

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By installing a chamfering device underneath the hob head, it is possible to chamfer the part in the tooling area after hobbing and deburr the part in the open space. Additionally, the secondary burrs caused by deburring can be removed by re-hobbing. The removal of secondary burrs prevents the tooth flanks from getting damaged due to the hardened secondary burrs in the finishing processes such as gear grinding or honing, contributing to improved tool life. The combination of hobbing, chamfering and deburring reduces the line length. Also, it is possible to process a shaft gear.

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<Milling Method by tracing using a carbide rotarty end mill>
The use of an auto part loader device enables chamfering during the hobbing process. Using the machine open space effectively, the rotating carbide end mills lightly touch the rotating part allowing chamfering for both top and bottom ends of the part. Chamfering is possible using the same rotarty end mill even if the part type is chgangred.

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Hard Hobbing

Hard Hobbing is a finish hobbing process for hardened gears.

There are two kinds of Hard Hobbing processes that use carbide hobs. One is "Finish Hobbing" in which hardened gears are "finished" after the initial tooth cutting. The other is "Hardened Solid Gear Hobbing" where hardened solid gear blanks are finished hobbed.

Kashifuji has developed an Auto Part Orientation Device utilizing a special non-contact sensor that quickly and accurately orientates gear teeth to the hob tool.

Finish Hobbing

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Hardened Solid Gear Hobbing

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Auto Part Orientation Device

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Programming

Programs are created by only inputting part gear data, hob data and cutting conditions. After the completion of the programs, hobbing will be automatically performed by selecting the part number.
Optional crowning, relieving and/or taper hobbing cycles are easily performed. Simple and easy-to-operate hobbing programs are available for a wide variety of production situations, from mass production to special prototype hobbing.

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