Vibration damping member for machine part and method of manufacturing the same, machine part using vibration damping blank material
A technology for mechanical parts and manufacturing methods, applied in the field of blanks for parts, can solve problems such as small scope, high price, and inability to ensure strength
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Embodiment 1
[0062] Next, the vibration-damping material for mechanical parts of the present invention will be described by way of examples in comparison with comparative examples.
[0063] The chemistry of the steel used as the test material is 0.21%C-0.32%Si-0.77%Mn-1.16%Cr-0.16%Mo-0.032%Al-0.011%N
[0064] As steel, a commercially available JIS-SCM420H round bar can also be used.
[0065] Such as figure 1 As shown, prepare the SCM420H with an outer diameter of 120 mm, an inner diameter of 25 mm, and a thickness of 20 mm. At the three distances L of the blank, the groove part 5 (such as figure 1 As shown, the shape in which the width of the inner side of the groove becomes smaller) is formed on the outer surface. In addition, the same groove shape was formed by machining on another test piece having the same composition and the same size (groove portion forming step).
[0066] Next, the parts subjected to groove processing by hot forging are not cooled after groove processing, but co...
Embodiment 2
[0074] In the above-mentioned Example 1, the evaluation results of the vibration damping performance of the state of the vibration damping material for mechanical parts (the vibration damping material for gears) before machining the teeth were shown. Of course, it is necessary to evaluate the vibration damping properties of the gears that are processed into actual parts in advance. Grasp the impact. Therefore, as shown in Table 2, three kinds of blanks (test No.E21-E23) with a depth of 13mm and diameters of 50mm, 60, and 75mm (test No. A spur gear 2 with a modulus of 3 and a number of teeth of 30 was fabricated from a billet (Test No. E24) with an interface depth of 3.5 mm slightly shallower than the lower limit of the evaluation sample of Example 1 and a non-bonding interface diameter of 60 mm. Then, in the same manner as in Example 1, the Figure 4 The positions shown (end surface excitation position S1, tooth surface excitation position S2) are excited by a hammer, and the...
Embodiment 3
[0082] In the above-mentioned Example 2, the evaluation was performed using a spur gear in a machined state. In order to satisfy the required strength in an actual gear, carburizing treatment is often performed, and it is necessary to The influence is correctly grasped. Therefore, the gear used in the above-mentioned Example 2 was used as it is, and a carburizing treatment was performed at 930° C. for 4 hrs, and the same vibration damping evaluation was performed. In addition, in the above-mentioned Example 2, in order to evaluate the vibration damping performance, when the test piece to be evaluated was suspended with a wire, the evaluation was performed by exciting vibration in a state where the side surface of the gear was in contact with the wire, but in this In Example 3, in order to reduce the influence of the wire contact, the evaluation was performed in a state where the side surface was not in contact with the wire. Moreover, evaluation was performed both before carb...
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