Bending /Forming/ Deep Drawing and Spinning - صفحة 2
منتدى هندسة الإنتاج والتصميم الميكانيكى
بسم الله الرحمن الرحيم

أهلا وسهلاً بك زائرنا الكريم
نتمنى أن تقضوا معنا أفضل الأوقات
وتسعدونا بالأراء والمساهمات
إذا كنت أحد أعضائنا يرجى تسجيل الدخول
أو وإذا كانت هذة زيارتك الأولى للمنتدى فنتشرف بإنضمامك لأسرتنا
وهذا شرح لطريقة التسجيل فى المنتدى بالفيديو :
http://www.eng2010.yoo7.com/t5785-topic
وشرح لطريقة التنزيل من المنتدى بالفيديو:
http://www.eng2010.yoo7.com/t2065-topic
إذا واجهتك مشاكل فى التسجيل أو تفعيل حسابك
وإذا نسيت بيانات الدخول للمنتدى
يرجى مراسلتنا على البريد الإلكترونى التالى :

Deabs2010@yahoo.com



 
الرئيسيةالبوابةاليوميةس .و .جبحـثالتسجيلدخولحملة فيد واستفيدجروب المنتدى

شاطر

 

 Bending /Forming/ Deep Drawing and Spinning

اذهب الى الأسفل 
انتقل الى الصفحة : الصفحة السابقة  1, 2
كاتب الموضوعرسالة
Admin
مدير المنتدى
مدير المنتدى
Admin

عدد المساهمات : 15192
التقييم : 25190
تاريخ التسجيل : 01/07/2009
العمر : 30
الدولة : مصر
العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
الجامعة : المنوفية

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالخميس 30 سبتمبر 2010, 5:59 pm

تذكير بمساهمة فاتح الموضوع :

Introduction


The pressing and deep drawing operations are based on shaping sheet metal by plastic deformation. The deformationis achieved by forcing the sheet metal into a formed female die using a male shaped punch. For the pressingoperations the process involves relatively shallow dies with little plastic flow of the sheet. For deep drawingthe die is relatively deep and significant plastic flow result. The simplest pressing process isbending.


Bending and forming

The process of simple bending and forming using press tools isshown in the figure below.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Bending

Deep Drawing

The important features of deep drawing are shown in the figure below. The pressure ring bears on the upper surface of the blank preventing wrinkling of the metal as it is drawn radially over the upper surface of the die. There is the option of applying pressure to the base of the cup using a pressure pad. Thinning results from this process, the worst being at the bottom radius as a result of drawing the full disc diameter inward under the pressurering. The thinning is the least at the top of the cup
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Deep_draw
If the deep drawing process can not produce a cup sufficiently deep in one operation then it is possible to split the operation into a number of stages. Also a redrawing operation is used. The drawing process results in work hardening and therefore the component may need to be bright annealed between drawing operations. The redrawing operation is shown in the figure below. The indirect redrawing operation has the advantage over the direct one in that the material bending is all in one direction i.e. there is no bending-unbending( as occurs in the direct method).
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Redraw

Spinning


Spinning is the process of forming a circular shape e.g. a cone, hemisphere, deep cup, etc.from a disc of sheet material by forcing it against a shaped former as the disc and former are rotated. The mandrel is held on the drive headstock spindle. The forcing tool is controlled either manually or using an electohydraulic drive system.

The actual forming process is progressive. The disc being gradually formed as shown in the figure below.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning
This process is ideal for low quantity ( ≤ 1000 ) processes or for production of prototype shapes. The process can be used for sections of 0,1 to 2m dia or more.

Shear Spinning /Flow Turning


In simple spinning the section of the formed is essentially the same as the disc. When shear spinning the maximum diameter of the formed section is the same as blank disc but the thickness of theformed section is substantially reduced compared to the blank disc. This process results in the final shape after one pass of the roller. This process results in significant shearing of the material being formed and highforces are required from the roller.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning_Shear
If T is the thickness of the blank disc and t is the thickness of the formed section then
t = T sin α
This process is also used in tube production as shown below. In this process the increase inlength of the tube is directly related to the reduction in thickness. i.e if the thickness is reduced to 50% ofthe orginal tube thickness the length will be doubled
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning_Shear_1 Materials and Sections


Most ductile materials can be formed using these processes including aluminium and copper, steel.
Equipment


Pressing operations and deep drawing operations are generally completed using mechanicalpresses using flywheels to provide kinetic energy. Hydraulic presses are also used.The various spinning operations can be completed on heavy duty centre lathes or special pupose machines which form asimilar function to centre lathes..

الرجوع الى أعلى الصفحة اذهب الى الأسفل

كاتب الموضوعرسالة
Admin
مدير المنتدى
مدير المنتدى


عدد المساهمات : 15192
تاريخ التسجيل : 01/07/2009

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالخميس 30 سبتمبر 2010, 5:59 pm

Introduction


The pressing and deep drawing operations are based on shaping sheet metal by plastic deformation. The deformationis achieved by forcing the sheet metal into a formed female die using a male shaped punch. For the pressingoperations the process involves relatively shallow dies with little plastic flow of the sheet. For deep drawingthe die is relatively deep and significant plastic flow result. The simplest pressing process isbending.


Bending and forming

The process of simple bending and forming using press tools isshown in the figure below.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Bending

Deep Drawing

The important features of deep drawing are shown in the figure below. The pressure ring bears on the upper surface of the blank preventing wrinkling of the metal as it is drawn radially over the upper surface of the die. There is the option of applying pressure to the base of the cup using a pressure pad. Thinning results from this process, the worst being at the bottom radius as a result of drawing the full disc diameter inward under the pressurering. The thinning is the least at the top of the cup
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Deep_draw
If the deep drawing process can not produce a cup sufficiently deep in one operation then it is possible to split the operation into a number of stages. Also a redrawing operation is used. The drawing process results in work hardening and therefore the component may need to be bright annealed between drawing operations. The redrawing operation is shown in the figure below. The indirect redrawing operation has the advantage over the direct one in that the material bending is all in one direction i.e. there is no bending-unbending( as occurs in the direct method).
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Redraw

Spinning


Spinning is the process of forming a circular shape e.g. a cone, hemisphere, deep cup, etc.from a disc of sheet material by forcing it against a shaped former as the disc and former are rotated. The mandrel is held on the drive headstock spindle. The forcing tool is controlled either manually or using an electohydraulic drive system.

The actual forming process is progressive. The disc being gradually formed as shown in the figure below.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning
This process is ideal for low quantity ( ≤ 1000 ) processes or for production of prototype shapes. The process can be used for sections of 0,1 to 2m dia or more.

Shear Spinning /Flow Turning


In simple spinning the section of the formed is essentially the same as the disc. When shear spinning the maximum diameter of the formed section is the same as blank disc but the thickness of theformed section is substantially reduced compared to the blank disc. This process results in the final shape after one pass of the roller. This process results in significant shearing of the material being formed and highforces are required from the roller.
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning_Shear
If T is the thickness of the blank disc and t is the thickness of the formed section then
t = T sin α
This process is also used in tube production as shown below. In this process the increase inlength of the tube is directly related to the reduction in thickness. i.e if the thickness is reduced to 50% ofthe orginal tube thickness the length will be doubled
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Spinning_Shear_1 Materials and Sections


Most ductile materials can be formed using these processes including aluminium and copper, steel.
Equipment


Pressing operations and deep drawing operations are generally completed using mechanicalpresses using flywheels to provide kinetic energy. Hydraulic presses are also used.The various spinning operations can be completed on heavy duty centre lathes or special pupose machines which form asimilar function to centre lathes..

الرجوع الى أعلى الصفحة اذهب الى الأسفل
محمد محمد أحمد
مهندس فعال جدا جدا
مهندس فعال جدا جدا


عدد المساهمات : 655
تاريخ التسجيل : 14/11/2012

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالثلاثاء 30 يوليو 2013, 2:35 am

جزاك الله خيرا

الرجوع الى أعلى الصفحة اذهب الى الأسفل
Admin
مدير المنتدى
مدير المنتدى


عدد المساهمات : 15192
تاريخ التسجيل : 01/07/2009

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالثلاثاء 30 يوليو 2013, 3:55 am

اقتباس :
جزاك الله خيرا

جزانا الله وإياك خيراً

الرجوع الى أعلى الصفحة اذهب الى الأسفل
radouani
مهندس تحت الاختبار
مهندس تحت الاختبار


عدد المساهمات : 1
تاريخ التسجيل : 04/05/2013

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالإثنين 19 أغسطس 2013, 6:01 pm

thnks

الرجوع الى أعلى الصفحة اذهب الى الأسفل
عليان
مهندس تحت الاختبار
مهندس تحت الاختبار


عدد المساهمات : 7
تاريخ التسجيل : 09/05/2012

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالإثنين 19 أغسطس 2013, 6:16 pm

مششششششششششششششششششششششششششكور

الرجوع الى أعلى الصفحة اذهب الى الأسفل
Admin
مدير المنتدى
مدير المنتدى
Admin

عدد المساهمات : 15192
التقييم : 25190
تاريخ التسجيل : 01/07/2009
العمر : 30
الدولة : مصر
العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
الجامعة : المنوفية

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالإثنين 19 أغسطس 2013, 6:32 pm

@radouani كتب:
thnks
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 259976 

الرجوع الى أعلى الصفحة اذهب الى الأسفل
Admin
مدير المنتدى
مدير المنتدى
Admin

عدد المساهمات : 15192
التقييم : 25190
تاريخ التسجيل : 01/07/2009
العمر : 30
الدولة : مصر
العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
الجامعة : المنوفية

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالإثنين 19 أغسطس 2013, 6:34 pm

@عليان كتب:
مششششششششششششششششششششششششششكور
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 259976 

الرجوع الى أعلى الصفحة اذهب الى الأسفل
houdaabasha
مهندس تحت الاختبار
مهندس تحت الاختبار
houdaabasha

عدد المساهمات : 88
التقييم : 136
تاريخ التسجيل : 02/03/2012
العمر : 34
الدولة : مصر
العمل : math king
الجامعة : طنــــــطـــــــــــــــا

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالثلاثاء 20 أغسطس 2013, 5:01 pm


Bending /Forming/ Deep Drawing and Spinning - صفحة 2 EPz1C

الرجوع الى أعلى الصفحة اذهب الى الأسفل
Admin
مدير المنتدى
مدير المنتدى
Admin

عدد المساهمات : 15192
التقييم : 25190
تاريخ التسجيل : 01/07/2009
العمر : 30
الدولة : مصر
العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
الجامعة : المنوفية

Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Empty
مُساهمةموضوع: رد: Bending /Forming/ Deep Drawing and Spinning   Bending /Forming/ Deep Drawing and Spinning - صفحة 2 Emptyالثلاثاء 20 أغسطس 2013, 6:28 pm

@houdaabasha كتب:
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 EPz1C
Bending /Forming/ Deep Drawing and Spinning - صفحة 2 259976

الرجوع الى أعلى الصفحة اذهب الى الأسفل
 
Bending /Forming/ Deep Drawing and Spinning
الرجوع الى أعلى الصفحة 
صفحة 3 من اصل 2انتقل الى الصفحة : الصفحة السابقة  1, 2

صلاحيات هذا المنتدى:لاتستطيع الرد على المواضيع في هذا المنتدى
منتدى هندسة الإنتاج والتصميم الميكانيكى :: المنتديات الهندسية :: منتدى المقالات والمواضيع الهندسية-
انتقل الى: