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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Delineation and application of semi-finished camshaft hole boring tool Description and application of semi-finished camshaft hole boring tool
In the diesel engine occupation; the semi-finishing of the camshaft hole on the cylinder head is one of the difficulties in the manufacturing process; the dimensional accuracy, shape and service and the surface roughness of the hole have high requirements; Cutting. But the reaming allowance. Xing Yu stopped the source of 欢 笈 笈 笈 涫 è°å‘± è°å‘± è°å‘± 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 岩 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且 而且The cost of the blade during the initial investment and processing is high; the customer starts from the economy; it is difficult to accept. To this end; we have drawn and produced a camshaft hole semi-finished boring tool. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
One. The layout and characteristics of the camshaft hole semi-finished boring tool are depicted on the cylinder head after the outer surface of the cylinder head has been machined; the bearing bush is inlaid; and the bolt is tightened; make it a whole. But after the composition; There are various reasons for the unequal hair loss; the inner hole and the end face are very irregular; the tool oscillation is easy to form. The requirements for the machining of the parts in this order are: inner hole dimension f42. 5mm; coaxiality of five holes f0. 03mm; Appearance roughness Ra1. 6.
Camshaft hole semi-finished boring knife layout and features (1) The shank part of the MAS403 specification uses 7:24 taper shank in the MAS403 specification; the public service grade is AT3 grade; the useful length of the arbor is 388mm. The cutter selects the overall layout; Tool rigidity.
(2) Some of the WALTER small tool holders FR671 are available for both cutting and axial adjustment. It is easy to adjust the end jump and the jump of the tool and the scale accuracy of the tool.
(3) The blade is made of CCMT060204-PS4 WAK10; it has two-color coated Shanjun blade with super wear resistance and different wear condition; it is a special blade for casting processing; the cutting function and life expectancy are improved by 75%. It reduces wear and reduces cost. Progressive work power.
(4) The tool selects four evenly distributed guide block layouts; it can accept the unevenness of the cutting force; the cutting force is unbalanced; the arbor of the arbor is formed and the tool guides itself; the rigidity of the tool can be added; the power is improved.
(5) The tool uses intermediate cooling; the oily cutting fluid helps to remove chips; the cooling effect of the cutting fluid is to take away a lot of cutting heat; reduce the cutting temperature, reduce the thermal expansion of the workpiece and the tool; improve the machining accuracy. During the cutting process; Knife surface and chip touch; severe conflicts; high pressure (above 1Gpa); cutting fluid also plays a role in the lubrication of the gap.
two. The determination of some drawing parameters of the camshaft hole semi-finishing boring tool and the selection of the tool bar data and the heat treatment hardness and the selection of the tool bar data are directly related to the strength and rigidity of the tool bar; it is the key to the success of the tool. We have selected the equivalent of domestic 20CrMnTi. The production process is: casting, normalizing, roughing, semi-finishing, heat treatment, finishing process road. The blank needs normalizing before the machine is added; its intention is to improve the casting condition. Irregular arrangement; to facilitate cutting; to ensure that the parts are qualified. The carburized layer thickness is 0.8-1. 2mm. After carburizing and quenching; the outer surface layer is higher in carbon content; the appearance is basically after quenching low temperature tempering It is a tempered martensite arrangement; it has high hardness and wear resistance; the hardness is HRC53-58, and its core is affected by the hardenability of steel due to Cr and Mn elements; this data can be tempered after quenching at low temperature. A tempered low-carbon martensite arrangement; an excellent cooperation with high strength and satisfactory impact toughness. Thus; the data is subjected to the above-mentioned hot and cold processing and heat treatment; the functions obtained are thoroughly satisfied with the skill requirements.
The determination and selection of the slot size of the tool holder on the arbor is based on the dimensions of the hole in the workpiece; it is determined that the tool holder can only adopt the axial device; the specific situation is shown in Figure 2.
The diameter and accuracy of the guide block are determined and selected to ensure smooth machining when the bore is made; there are four support strips on the cutter body. After the insert is installed, the radial runout of the support strip must not exceed 0. 02mm. The guiding angle should be equal to the main declination of the teeth; the axial end point (lowest point) of the supporting strip should be lower than the cutting edge of 0. 5mm. According to our experience; the length of the supporting strip is 1-4 times the diameter; width It is 0.2 times of the diameter. Because the roughness value of the outer surface of the support bar directly affects the roughness value of the surface of the hole to be processed; it is the roughness value of the surface of the hole to be machined; the roughness R Ra of the support bar is often taken. 1μm.
From the working condition, there are two support bars; that is, the guide block is located at about 20° behind the knife slot. This placement allows the guide block to accept the cutting force; to ensure the dimensional accuracy and linearity of the hole. The tortuosity theory of data mechanics clarifies that the end deformation of the cantilever beam is directly proportional to the third power of the overhanging degree. After the support bar is added; because the length of the cantilever is greatly reduced. The poisonous cockroach moves over the glutinous rice. The practice experience indicates; When the hole is deeper; four support bars are welded along the circumference of the boring bar; the rigidity of the boring tool will be improved. The two support bars added will first serve as a damping effect; the oscillation will be reduced. In addition to ensuring the accuracy and guiding effect of the aperture size External; because of its kneading and conflicting effect on the wall of the hole; it has a great influence on the surface roughness of the machined hole.
To ensure that the support bar has a corresponding kneading margin; reduce the roughness of the surface of the hole to be machined; the radius from the middle of the tool to the tip of the tool does not coincide with the radius of the tool to the radius of the guide block. This difference depends on the material being processed; Processing of cast iron parts: when the hardness of the material to be processed is HBS≤200; the radius of the support bar and the tool tip is -0.95mm~0.005mm, when the hardness of the processed material is HBS≥200; the support bar and the tool tip The radius of 0. 002mm ~ 0. 02mm.
three. The key points in the application process are the cutting parameters. Cutting speed: 100m/min
Feeding speed: 150mm/min
Spindle speed: 750r/min
Feed per tooth: 0.1 mm/Z
Before use, it should pay attention to whether the margin of the support bar can be lubricated; avoid the damage of the margin of the support bar in the transportation and storage, etc. If the edge of the support bar is found to have burrs, collapses and other unlubricated appearances; the oilstone backlight should be used in time; To improve the dimensional stability of the workpiece; improve the appearance roughness of the workpiece.
The machine tool should be stable; the rigidity of the process system should be good; avoid the oscillation of the workpiece.
The lubricating fluid must be sufficient; the concentration is about 15%.
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Description and application of semi-finished camshaft hole boring tool
Source: China Bearing Network Time: 2014-09-18