How to calculate the cutting force of iron plate

1.

Bending force calculation formula: P = 650 × S × S × L / V (tensile strength = 450N / mm ~ 2)

P -- bending force (KN)

s -- plate thickness (mm)

L -- plate width (m)

V -- lower die groove width (mm), generally 8 times of plate thickness. For more than 10 thick plates, V is usually 10 times the thickness of the plate

under the pressure of the upper die or the lower die of the bending machine, the sheet metal first goes through elastic deformation, and then enters into plastic deformation. At the beginning of plastic bending, the sheet metal is free bending

with the pressure of the upper die or lower die on the sheet metal, the sheet metal and the inner surface of the V-shaped groove of the lower die are graally close, and the curvature radius and bending arm are graally smaller. Continue to press until the end of the stroke, so that the upper and lower die and the sheet metal are close to each other at three points, and a V-shaped bending is completed

extended data:

large fillet should be made at sharp bend to prevent folding ring final forging. There should be two fulcrums on the lower die to support the blank before bending. The height of these two points should enable the blank to be placed horizontally

When the blank is bent in the die groove, the control position of the stop table should be made at the end of the bending die groove. Transverse arc pits should be made on the protruding part of the die groove for the positioning of the blank. The depth of the pits is HL ~ (0.1 ~ 02) H (H is the depth of the corresponding part of the die groove). The die groove should have a proper slope, so that the blank can be easily taken out from the die groove after bending and the operation is convenient

2. This can check the tensile strength of the material from the mechanical design manual, and then calculate the shear stress according to the empirical formula (in the manual), and then take a certain safety factor to determine the required force, and then determine the power of the oil pump. I don't have a manual now. I can't tell you the formula. You can check it yourself.

3.

σ= Fb/So

in the tensile process, the material enters the strengthening stage after the yield stage, and then the maximum force FB is obtained by dividing the original cross-sectional area so of the sample with the decrease of the transverse section size σ， It is called tensile strength or strength limit σ b. The unit is MPa. It represents the maximum ability of a metal material to resist failure under tension. The calculation formula is as follows: σ= Fb/So

when the steel yield to a certain extent, e to the rearrangement of internal grains, its resistance to deformation increases again. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the stress reaches the maximum. After that, the ability of steel to resist deformation is obviously reced, and a large plastic deformation occurs at the weakest point, where the cross section of the specimen shrinks rapidly, necking phenomenon occurs, and finally fracture occurs

(kilogram force per unit area)

in China, the universal material testing machine is widely used to measure the tensile / compressive strength of materials

for brittle materials and plastic materials without necking, the highest tensile load is the fracture load, so the tensile strength also represents the fracture resistance. For necking plastic materials, the tensile strength represents the resistance to the maximum uniform deformation and the ultimate bearing capacity of the material under static tension. For parts such as wire rope, tensile strength is a significant performance index. Tensile strength is easy to measure and has good reprocibility. It has a certain relationship with other mechanical properties such as fatigue limit and hardness. Therefore, it is also used as one of the conventional mechanical properties to evaluate proct quality and process specification

5. You can smuggle through neutral auction houses in goblin cities. For example, you can sell 5000g of hard jerky on your alliance, and then buy it on your tribe, which is equivalent to pouring money. But the handling charge is very high, which seems to be 15%. Is the goblin equivalent# 92;， And the same account under the alliance tribal number can not be so trading, can only use different accounts under the role

6. The most cost-effective way is to exchange money with people who are at ease

7. 1、 Background of the topic
mathematics curriculum standard points out that mathematics is an indispensable tool for people's labor and learning, and for everyone, it is a lifelong beneficial thing to learn to calculate well in primary school and form a certain computing ability. Since the implementation of the curriculum reform in 2001, the calculation content and requirements of primary school mathematics have been greatly adjusted, a large number of cumbersome calculation contents have been deleted, and the calculation requirements have been appropriately reced. In the fourth year of our school's trial use of the primary school mathematics textbook of the people's ecation press, we obviously feel that after the curriculum reform, the students' overall computing ability is not as good as the students who used the old textbooks before. Both the accuracy of calculation and the habit of calculation have declined, and the higher the grade, the more problems in calculation, which has caused obstacles to the development of students. Therefore, we put forward this research topic, trying to explore more effective methods to improve students' computing ability in the use of new teaching materials, so as to promote the improvement of teachers' teaching methods and students' computing ability. 2、 The purpose of the research is to find out the countermeasures to improve the primary school students' mathematical calculation ability through the analysis of the primary school students' mathematical calculation ability, and test the feasibility of the Countermeasures in practice, so as to improve the students' calculation skills and lay a good foundation for the students' better development in the follow-up mathematics learning, Build a teaching and research platform concive to teachers' professional development. 3、 Research methods:
1. Literature research method: through the search and research of related theories, establish effective theoretical support, and guide the experimental work in each experimental stage
2. Investigation and research method: before the experiment, the students' computing ability was investigated by questionnaire, and the students' existing computing basis was found out by conversation and questionnaire. Process investigation was carried out ring the experiment. In order to provide the basis for the implementation of the program and make dynamic adjustment, we need to carry out effect investigation and on-the-spot inspection in order to understand the current situation of students and the feedback information of teachers. 3 case study method: through the analysis of typical mistakes and lesson examples, we can find the essence of the problem and study the effective strategies to solve the problem. 4. Experimental research method: in the normal teaching situation, each grade selects two teaching classes as the research object to carry out the experiment, after the formation of research results, and then widely promote
5. Experience summary method: through the actual inction, detection and demonstration, form the research report. 4、 The research object and time
the research object is the fourth grade students, and the research time is one year. 5、 Research steps

8. This semester, Zhang Ling of Qianwei Road Primary School in Lianhu District applied for the scientific research project of basic ecation in Xi'an: how to improve the computational ability of primary school students. In my daily work, I try to guide my daily teaching practice according to the requirements of research, and summarize, exchange and improve the experience of teaching reform practice in time. It strengthens the research of classroom teaching reform, changes students' learning style, and promotes the improvement of teachers' teaching level and teaching quality. As a grade one math teacher, I focus on the teaching of oral arithmetic. The teaching of oral arithmetic plays an important role in primary school mathematics teaching. The first grade is an important period to lay a good foundation for oral arithmetic, which will directly affect students' computing ability in the future. However, the first grade pupils are not mature because of their young age. Therefore, it is common for them to make mistakes in calculation practice. 1、 Analysis of the causes of students' errors in oral arithmetic, the reasons for children's errors in oral arithmetic are various, the specific summary is as follows: 1, psychological reasons, primary school students' perception of events is more general, not specific enough, often only pay attention to some independent things, can't detect the relationship and characteristics between things, so they lack the overall understanding of things. Sometimes when doing oral arithmetic, some students blurt out the answers before they can see the numbers or symbols clearly. 2. The influence of non intelligence factors. First year students are too young to recognize the importance of correct oral arithmetic. He was not interested in oral arithmetic, and the mechanical repetition training was troublesome, so he said it without thinking. Moreover, good study habits have not yet been fully developed. When doing homework, you can't concentrate on mental arithmetic; Nonstandard writing, sloppy writing and uneasy checking after calculation are all the reasons for calculation errors.

9. Of course, we need to find a professional and reliable company. For example, Meiji Angel confinement center has a professional management system and legal brand support.

10.

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