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      Jinan Longao CNC Machinery Co., Ltd. is an enterprise dedicated to the design, development and production of precision CNC engraving equipment. Over the years, remarkable achievements have been made in the research and development and production of precision machine design and engraving technology, and the product quality has passed the EU CE certification and has been widely recognized.

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Machining allowance

Release time:

2024-01-29

Gravity cutting It is widely used in the production of various non-ferrous castings, but metal mold cutting also has the disadvantages of low metal utilization rate, difficult pouring of thin-walled complex castings, and low relative pressure cutting of casting tissue density.

Metal cutting types modeling methods are customarily divided into: ① ordinary sand type cutting, including wet sand type, dry sand type and chemical hardening sand type 3 categories. ② Special cutting, according to the molding material can be divided into natural mineral sand as the main molding material of special cutting (such as investment cutting, mud cutting, cutting workshop shell cutting, negative pressure cutting, solid cutting, ceramic cutting, etc.) and metal as the main casting material of special cutting (such as metal cutting, pressure cutting, continuous cutting, low pressure cutting, centrifugal cutting, etc.). Metal cutting process usually includes: ① preparation of mold (container for making liquid metal into solid castings). The mold can be divided into sand mold, metal mold, ceramic mold, mud mold, graphite mold, etc. according to the materials used, and can be divided into disposable mold, semi-permanent mold and permanent mold according to the number of uses. The quality of mold preparation is the main factor affecting the quality of castings; ② Melting and pouring of cut metals, cutting metals (cutting alloys) mainly include cast iron, cast steel and cutting non-ferrous alloys; ③ Casting treatment and inspection, casting treatment includes removal of foreign matter on the core and casting surface, removal of gating risers, shoveling and grinding of protrusions such as spines and seams, as well as heat treatment, shaping, rust prevention treatment and roughing.

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Congratulations on the official release of the website of Jinan Longao CNC Machinery Co., Ltd!!!

Jinan Longao CNC Machinery Co., Ltd. is an enterprise dedicated to the design, development and production of precision CNC engraving equipment. Over the years, remarkable achievements have been made in the research and development and production of precision machine design and engraving technology, and the product quality has passed the EU CE certification and has been widely recognized.

Properties of metals

The cutting performance of metal includes: ① fluidity, the ability of liquid metal to fill the mold; ② shrinkage tendency, large volume shrinkage from liquid to solid, easy to produce defects such as shrinkage cavity, and large linear dimensional shrinkage, which affects the final dimensional accuracy of castings; ③ hot cracking tendency, some metals and alloys are prone to cracks and segregation tendency in the cutting process.

Handling and Inspection

Mold (liquid metal into a solid casting container) preparation, mold according to the materials used can be divided into sand, metal, ceramic, mud, graphite, etc., according to the number of use can be divided into one-time, semi-permanent and permanent, mold preparation is the main factor affecting the quality of castings

Machining allowance

Gravity cutting It is widely used in the production of various non-ferrous castings, but metal mold cutting also has the disadvantages of low metal utilization rate, difficult pouring of thin-walled complex castings, and low relative pressure cutting of casting tissue density.

When using metal type cutting, the following factors must be considered

When using metal type cutting, the following factors must be considered comprehensively: long manufacturing cycle, high cost, not suitable for single-piece and small-batch production; It is not suitable for cutting complex shapes (especially inner cavities), thin-walled and large castings (metal molds are limited by the size of mold materials and the ability of cavity processing equipment and cutting equipment, so metal molds are not suitable for the production of particularly large castings). The mold is more expensive than sand mold and cheaper than die casting.
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