140CRA21110C Quantum

機(jī)械設(shè)計(jì)中可以選擇的材料種類(lèi)眾多，不同的材料具有不同的性能，不同的材料對(duì)應(yīng)不同的加工工藝.結(jié)構(gòu)設(shè)計(jì)中既要根據(jù)功能的要求合理地選擇適當(dāng)?shù)牟牧希忠鶕?jù)材料的種類(lèi)確定適當(dāng)?shù)募庸すに?，并根?jù)加工工藝的要求確定適當(dāng)?shù)慕Y(jié)構(gòu)。只有通過(guò)適當(dāng)?shù)慕Y(jié)構(gòu)設(shè)計(jì)才能使所選擇的材料充分地發(fā)揮優(yōu)勢(shì)。要做到正確地選擇結(jié)構(gòu)材料就充分地了解所選材料的力學(xué)性能、加工性能、使用成本等信息。

例如彈性聯(lián)軸器的設(shè)計(jì)中需要選擇彈性元件的材料有金屬、橡膠、尼龍、膠木等。由于所選彈性元件材料的不同，使得聯(lián)軸器的結(jié)構(gòu)變化很大。由于彈性元件的壽命短，使用中需多次更換.在結(jié)構(gòu)設(shè)計(jì)中應(yīng)為更換彈性元件提供可能和方便，為更換彈性元件留有必要的操作空間使更換彈性元件所拆卸、移動(dòng)的零件盡量少。

結(jié)構(gòu)設(shè)計(jì)中應(yīng)根據(jù)所選材料的特性及其所對(duì)應(yīng)的加工工藝而遵循不同的設(shè)計(jì)原則。

鋼材受拉和受壓時(shí)的力學(xué)特性基本相同，因此鋼梁結(jié)構(gòu)多為對(duì)稱(chēng)結(jié)構(gòu)。鑄鐵材料的抗壓強(qiáng)度遠(yuǎn)大于抗拉強(qiáng)度，因此承受彎矩的鑄鐵結(jié)構(gòu)截面多為非對(duì)稱(chēng)形狀，以使承載時(shí)大壓應(yīng)力大于大拉應(yīng)力。塑料結(jié)構(gòu)的強(qiáng)度較差，螺紋聯(lián)接件產(chǎn)生的裝配力很容易使塑料零件損壞.在兩個(gè)被聯(lián)接件上分別做出形狀簡(jiǎn)單的搭鉤和凹槽,裝配時(shí)利用塑料零件彈性變形量大的特點(diǎn)使搭鉤與凹槽互相咬合實(shí)現(xiàn)聯(lián)接，裝配過(guò)程簡(jiǎn)單準(zhǔn)確、便于操作。設(shè)計(jì)的結(jié)果要通過(guò)制造和裝配實(shí)現(xiàn)，結(jié)構(gòu)設(shè)計(jì)中如果能根據(jù)所選材料的工藝特點(diǎn)合理地確定結(jié)構(gòu)形式則會(huì)為制造過(guò)程帶來(lái)方便。

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