Forging factory talk about how to control the blanking utilization rate of the free forging plant?
When cutting forgings, the loss of metal varies with the cutting equipment, the method of cutting the blank and the skill level of the workers.
Forging factory talk about how to control the blanking utilization rate of the free forging plant?
1. Forging manufacturers say that the annual output of forgings in large-scale die forging workshops with mass production ranges from more than 10,000 tons to tens of thousands of tons.
Choose bar shearing machine in the range of 2.5 ~ 16MN according to equipment load rate, crank press below 1.6Mn generally bar shearing machine above 5MN is equipped with mechanized bar preheating furnace or thyristor medium frequency induction heating furnace: sawing machine is only used for cutting blanks needed by individual profiles, or only for processing material head, pipe cutting machine is used according to needs.
In actual production, such as large tractor factories and large automobile factories, the blanking utilization rate of materials prepared for forging is between 95% and 91%.
Including material head, material core (even skin), jaw and other wastes.
As high as 98.5%.
two。.
The forging factory said that in the medium-sized die forging workshop of mass production, the annual output of forgings is less than 10,000 tons, and the blank size and steel grade vary greatly.
It is necessary to consider not only the unit load rate, but also complete sets of equipment to adapt to the change of production tasks.
Most of them use bar shears below 5MN or 10MN, and crank presses below.
The blanks that exceed the shearing capacity of the shearing machine are cut with a sawing machine, and the average utilization rate of material cutting can reach 93%-95%.
3.
In the small forging workshop, the large size blank is sawed and the small size blank is cut.
The utilization rate of material cutting is between 91% and 93%.
4.
Forging manufacturers say that due to the development of precision die forging, toothed gear die forging, gear blank precision forging and block forging, some manufacturers use band sawing machines.
Because the cutting length tolerance is more accurate than shearing, the sawing loss is smaller, and the material cutting utilization rate can reach 93%.
5.
A small number of small and medium-sized free forging workshops and die forging workshops are still using old sawing machines for blanking.
G607 circular saw machine commonly used 660-71mm circular saw blade thickness 6.5mm, notch loss width 8mm, material blanking utilization rate is generally less than 92%.
Due to unreasonable process, the ratio of length to diameter of blank in some forging plants is too small, and the utilization rate of material cutting is as low as 85%.
Forging manufacturers say that in the production of forgings, the cost of raw materials generally accounts for 50% of the production cost of forgings.
Saving raw materials is the main means to reduce the production cost of forgings.
Change cutting cutting into cutting or precision cutting as far as possible; develop new precision cutting technology and equipment; popularize band sawing machine.
The development of a new type of high-speed circular saw blade with high-speed steel circular saw blade or cemented carbide sawtooth bimetal cutting blade to replace part of the old circular saw machine is one of the main measures to improve cutting productivity, reduce cutting loss and save raw materials.
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