生鐵鑄件為什么抽窟窿

生鐵鑄件為什么抽窟窿

機床鑄件厚度一般為15~30mm。灰鑄鐵作為機床基礎零件的主要結(jié)構(gòu)材料，應具備良好的精度穩(wěn)定性、抗壓強度和減振性，高的彈性模量和耐磨性，良好的切削行能和鑄造性能，以及低的生產(chǎn)成本。機床導軌的配合副是在邊界潤滑條件下工作的，要求灰鑄鐵具有較高的宏觀硬度（200~240hbs），數(shù)量適當、長度小于250μm且分布良好的A型石墨，基體有較高的顯微硬度，并有硬質(zhì)點彌散分布，以保證機床導軌的耐磨性。對機床導軌表面硬度及硬度差的要求。

目前國外機床鑄件大多采用δb=300mpa或350mpa高強度灰鑄鐵鑄造。在提高灰鑄鐵強度和剛度的基礎上，國外機床鑄件向輕量化方向發(fā)展，機床的主要壁厚已從過去的20~25mm減至近來的14~20mm，切削力小的小型精密機床床身主要壁厚僅8~10mm。目前我國機床主要鑄件（如：床身、工作臺、立柱、橫梁等）。一般采用HT200、HT250和HT300三種牌號的灰鑄鐵，為了提高機床的使用期限，尤其是不再經(jīng)熱處理的機床導軌壽命，國內(nèi)機床鑄件廣泛采用低合金高強度減磨鑄鐵，其化學成分和金相組織。

幾種減磨鑄件的金相組織分析可知，在含磷鑄鐵中，較高的含磷量形成斷續(xù)網(wǎng)狀的磷共晶；在磷銅鈦鑄鐵中，釩鈦兩元素形成具有很高顯微硬度的釩鈦談單化合物，并以細小的硬質(zhì)點彌散分布于基體組織中，從而顯著地提高了機床鑄件的耐磨性。對于采用淬火硬化的機床導軌，測灰鑄鐵牌號必須高于HT200，珠光體量不小于90%，珠光體間距不大于2μm。

Why are cast iron castings?
The thickness of machine tool castings is generally 15~30mm. As the main structural material of machine tool basic parts, gray cast iron should have good precision stability, compressive strength and vibration damping, high modulus of elasticity and wear resistance, good cutting performance and casting performance, and low production. cost. The matching pair of the machine tool guide rail works under the condition of boundary lubrication. It requires gray cast iron with high macro hardness (200~240hbs), a proper amount of A-type graphite with a length less than 250μm and good distribution, and the matrix has high microscopic structure. Hardness, and a hard point dispersion distribution to ensure the wear resistance of the machine guide rail. Requirements for the hardness and hardness of the machine guide rail surface.
At present, foreign machine tool castings are mostly cast with δb=300mpa or 350mpa high-strength gray cast iron. On the basis of improving the strength and rigidity of gray cast iron, foreign machine tool castings are developing in a lighter direction. The main wall thickness of the machine tool has been reduced from the past 20~25mm to the recent 14~20mm, and the small precision machine tool bed with small cutting force is mainly The wall thickness is only 8~10mm. At present, the main castings of machine tools in China (such as: bed, workbench, column, beam, etc.). Generally adopt GH200, HT250 and HT300 gray cast iron. In order to improve the service life of the machine tool, especially the machine guide life without heat treatment, the domestic machine tool castings are widely used in low alloy high strength anti-friction cast iron, its chemical composition and gold. Organization.
The metallographic analysis of several kinds of anti-wear castings shows that in the phosphorus-containing cast iron, the higher phosphorus content forms the intermittent network-like phosphorus eutectic; in the phosphor bronze-titanium cast iron, the vanadium-titanium two elements form a very high microhardness. The vanadium-titanium is a single compound and is dispersed in the matrix structure with fine hard spots, which significantly improves the wear resistance of the machine tool castings. For quench-hardened machine tool guides, the gray cast iron grade must be higher than HT200, the pearlite volume is not less than 90%, and the pearlite spacing is not more than 2μm.

Company name: botou zhuoyuan mechanical equipment manufacturing co.,LTD
Registered address: jiaohe development zone, botou city, hebei province
Fax number: 0317-8031093
Contact information: 15369812793 (WeChat with the same number)  liansheng chu
Postcode: 062151
Enterprise email:1358827475@qq.com
Account Opening Bank: Botou Branch of Bank of China
Account number: 100399943203
Agricultural bank account number: 6228481739059615270