Jun

Tool breakage, chipping

Having been in the machining industry for many years, you must be no stranger to tool failure.Tool failure will affect machining accuracy and productivity, operator safety, and part quality.When tool breakage is observed, the machining process should be carefully analyzed in time to find the root cause.

Flank wear
Flank wear refers to the abrasion loss of the flank of the tool immediately below the cutting edge. The carbide particles in the workpiece material or the work-hardened material rubs against the blade. Small pieces of the coating peel off and the blade rubs. The cobalt element in the blade is finally separated from the crystal lattice, reducing the adhesion of the cemented carbide and thus peeling off.

Relatively uniform wear along the cutting edge. Sometimes flaking work material sticks to the cutting edge, making the wear look exaggerated than it actually is. Duratomic blades are black when worn, while the wear of ordinary blades is shiny. The black color is the bottom coating that is displayed after the surface coating is peeled off.

Crumble
Flank chippingⅠFlank chipping refers to a mechanical failure that occurs when small particles on the cutting edge are peeled off instead of being worn away by the flank. Flank face spalling occurs when there is an impact load change, such as intermittent cutting. Flank chipping is often the result of unstable workpiece conditions, such as when the tool is too long or the workpiece is under-supported. The secondary cutting of chips is also easy to cause chipping.Rake face peelingⅡViscous materials will spring back after cutting. This springback may exceed the clearance angle of the tool and create friction between the clearance surface of the tool and the workpiece. This friction will cause a polishing effect and may cause work hardening of the workpiece. It will increase the contact between the tool and the workpiece, which will cause heat to cause thermal expansion, leading to expansion of the rake face, and chipping of the rake face.

Rake area edge
Certain workpiece materials may create a rake area between the chip and the cutting edge. When the continuous lamination of the workpiece material is connected to the cutting edge, built-up edge will occur. The built-up tumor is a dynamic structure. During the cutting process, the cut surface of the built-up edge continuously peeled off and reattached.

The cutting edge of the rake area also tends to occur at low processing temperatures and relatively slow cutting speeds. The actual speed at which a cutting edge occurs in the rake area depends on the material being processed. If the work hardening material is processed, such as austenitic stainless steel, then the cutting edge area of the rake can cause rapid accumulation at the depth of cut, resulting in a secondary failure mode of damage at the depth of cut.

Previous Article Next Article

This Blog keeps our valued customers informed of important Radiac News and Events, and in the industries we serve.

RELATED PRODUCTS

Process Analysis and Application of Diamond Grinding Wheel for Hobbing Cutter

Common Centerless Grinding Methods

Brief Introduction of UB Centerless Grinding Wheel

Cylindrical Grinding machine for crankshaft

Crankshaft: the core component in an engine and its classification in detail

Processing Case for Hydraulic Industry

Consent

Details

About

This website uses cookies

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services.

Necessary

Necessary cookies help make a website usable by enabling basic functions like page navigation and access to secure areas of the website. The website cannot function properly without these cookies.

Preferences

Preference cookies enable a website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in.

Statistics

Statistic cookies help website owners to understand how visitors interact with websites by collecting and reporting information anonymously.

Marketing

Marketing cookies are used to track visitors across websites. The intention is to display ads that are relevant and engaging for the individual user and thereby more valuable for publishers and third party advertisers.

Deny

Customize

Allow all

Deny

Allow selection

Allow all

Deny

Customize

Allow all