8 results about "Dry machining" patented technology

Disclosed is a pre-sintered ceramic block for a dental restoration, which has a low pre-sintering temperature, contains a silica main crystal phase, but does not contain or contains a small amount of lithium metasilicate crystal phase. The pre-sintered ceramic block has a low hardness, with a Vickers hardness of 0.5-3 GPa, which is significantly lower than that of a ceramic block containing a lithium metasilicate crystal phase, and same is suitable for dry machining and also wet machining when being machined into a dental restoration.

This invention discloses a free-machining high-strength aluminum-lithium alloy, its preparation method, and its applications, belonging to the field of alloy materials technology. The free-machining high-strength aluminum-lithium alloy has the following weight percentages of elements: Li: 3.5–5.5%, Cu: 2.6–3.1%, Zn: 6.8–7.1%, Mg: 2.1–3.0%, Y: 1.5–4.0%, Bi: 0.85–1.05%, In: 0.05–0.08%, Cr: 0.05–0.45%, Ti: 0.02–0.04%, with the balance being Al. This invention involves batching, smelting, refining, online refining, online degassing and filtration, casting, homogenization, extrusion, and two-stage aging treatment to finally obtain a free-machining high-strength aluminum-lithium alloy with a uniform microstructure. This invention has a reasonable component ratio, low manufacturing cost, and the resulting product has excellent strength and hardness, and exhibits excellent surface finish after dry machining.

A pre-sintered porcelain block for dental restoration; the pre-sintered porcelain block does not contain crystal phases and has a Vickers hardness of 0.5-2 GPa. Due to a hardness which is significantly lower than that of the porcelain block containing a lithium metasilicate crystal phase, the pre-sintered porcelain block may be processed by using dry machining and can simultaneously be processed by using wet machining when being mechanically processed into a dental restoration shape.

The present application relates to the field of milling cutter coating design, in particular to a kind of composite coating cutter and its preparation method.The cutter includes cemented carbide substrate and composite coating;The composite coating is prepared by arc ion plating, and from substrate to outside, it includes XN transition layer, AlXN intermediate layer, nano-composite functional layer;X is Ti and / or Cr.Its preparation method includes using arc ion plating to prepare each coating.The present application improves the service life of coating by designing multilayer coating, and avoids the problem that nano-composite functional layer falls off early due to low adhesion by designing transition layer and intermediate layer.The present application can effectively improve the performance of cutter in dry machining, reduce the wear length of relief surface.

The present application belongs to the technical field of cutting tool surface coating, and discloses a hard coating for titanium alloy cutting and a preparation method and application thereof. The hard coating comprises a bottom layer and a top layer. The bottom layer is a W bottom layer or a W-N bottom layer, and the top layer is a W top layer or a W-N top layer. The thickness of the hard coating is 2.0-2.5 μm, wherein the thickness of the bottom layer is 0.3-0.6 μm, and the thickness of the top layer is 1.5-2.0 μm. The elements in the hard coating are tungsten 80-100 at. % and nitrogen 0-20 at. %. The coating is deposited by high-power pulsed magnetron sputtering. The coating has good hardness and good oxidation resistance, prolongs the service life of the coated tool in titanium alloy machining, and still shows excellent titanium alloy cutting performance under dry machining conditions.

The invention discloses a multi-element composite coating cutting tool which has high hardness, excellent high-temperature oxidation resistance and wear resistance and can meet the dry machining requirements of difficult-to-machine materials such as titanium alloy and the like as well as a preparation method and application of the multi-element composite coating cutting tool. The multi-element composite coating cutting tool comprises a base body, and an AlTiN coating, an AlTiCrN coating and an AlTiCrSiBN coating which are sequentially deposited on the base body. The preparation method of the multi-element composite coating cutting tool comprises the following steps that an AlTi target is deposited on the surface of a base body in a nitrogen atmosphere through arc ion plating, and an AlTiN coating is formed; an AlTiCr target is deposited on the surface of the AlTiN coating in the nitrogen atmosphere through arc ion plating, and an AlTiCrN coating is formed; and an AlTiCrSiB target is deposited on the surface of the AlTiCrN coating in the nitrogen atmosphere through arc ion plating, and the AlTiCrSiBN coating is formed.

The invention relates to the field of milling blade coating design, in particular to a composite coating cutter and a preparation method thereof. The cutter comprises a hard alloy matrix and a composite coating, the composite coating is prepared in an arc ion plating mode and sequentially comprises an XN transition layer, an AlXN middle layer and a nano composite functional layer from a base body to the outside. And X is Ti and / or Cr. The preparation method comprises the step of preparing each coating by adopting arc ion plating. According to the invention, by designing multiple layers of coatings, the service life of the coating is prolonged by introducing the high-hardness nano-composite functional layer, and the problem that the coating falls off early due to low binding force of the nano-composite functional layer is avoided by designing the transition layer and the middle layer. The performance of the tool in dry machining can be effectively improved, and the abrasion length of the rear tool face is reduced.

According to the liquid level display and alarm device of the alcohol type cooling liquid for target material processing, based on the communicating vessel principle, the transparent vertical communicating pipe is arranged on the outer side face of the cooling liquid storage container, so that the cooling liquid storage container and the transparent vertical communicating pipe have the same liquid level, and the liquid level is displayed through the position of the magnetic floating ball in the vertical communicating pipe; the residual amount of the alcohol type cooling liquid in the cooling liquid storage container can be known at any time, when the liquid level is low to the alarm liquid level, an alarm is given through the alarm, an operator can be reminded to add the alcohol type cooling liquid in time, the alcohol type cooling liquid is enough when a target material is machined, a vehicle cannot be dried, and the product quality and the machining efficiency are guaranteed. The device disclosed by the utility model not only can reduce the workload of operators, but also can avoid dry turning caused by insufficient alcohol type cooling liquid during product processing, is stable in surface quality and high in efficiency, and has the advantages of simple and practical structure.