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دسته بندی ابزارهای برشی از نظر مواد ساخت :

چنان که بیان شد جنس ابزارهای براده برداری را به 7 دستهً متداول تقسیم می کنند:

1-1فولادهای تندبر

این فولادها دارای پایه آهن به اضافه عناصر کربن،کرم،وانادیم،مولیبدن یا تنگستن یا ترکیبی از این دو و در بعضی موارد کبالت می باشد . فولادهای تندبر شامل دو خانوادهً مولیبدنی و تنگستنی هستند، از انواع مولیبدنی مثل فولادهای M1،M2،M41،و از انواع تنگستنی TI،TIS و غیره . با توجه به اینکه عنصر مولیبدن نسبت به تنگستن فراوانتر و ارزانتر است، ساخت فولادهای تندبرمولیبدنی و استفاده از آنها گسترش بسیار بیشتری یافته است از طرفی مقاومت به سایش گروه M نیز بیشتر از گروه Tمی باشد. اصولا مهمترین خاصیت فولادهای تندبر، قابلیت برش کاری آنهاست، که این قابلیت به ترکیبی از عوامل مختلف بستگی دارد که مهمترین آنها چهار عامل زیر هستند:

a) سختی

b) سختی سرخ

c) مقاومت به سایش

d) تافنس

سختی در فولادهای تندبر معمولی 65-62 راکول C می باشد و در بعضی موارد مثل سری M40 و در بعضی از انواع M30 و T12 تا 69 راکول C  نیز می رسد.

2- 1فولادهای تندبر متالورژی پودر

فولادهای تندبر ساخته شده به روش متالورزی پودر(P/M) بطور بسیار گسترده ای در ساخت مته ها، قلاویز ها، برقورها فرزها و سایر ابزارهای برشی بخاطر خصوصیات بسیار عالی تولیدی و بالا بودن کارائی بکار می روند. فولادهای معمولی تندبر ساختار خشن و غیر یکنواخت دارند و معایبی نظیر قابلیت سنگ زنی پائین و غیر یکنواختی در سختی نسبت به فولادهای تندبر متالورژی پودردارند، در حالی که در روش PM ذرات بسیار ریز یک ساختار بسیار یکنواخت را با یک توزیع یکنواخت بوجود می آورند . مهمترین روش PM در تولید فولادهای تندبر، تافنس عالی و استحکام فوق العاده ناشی از توزیع یکنواخت ذرات فولاد است، همچنین بهبود قابلیت سنگ زنی ناشی از ریز بودن ذرات و همچنین بهبود کنترل اندازه ها در هنگام تولید و ابعاد در عملیات حرارتی که ناشی از عدم وجود پدیده جدایش ذرات است نیز از محاسن دیگر این روش هستند . مهمترین و معروفترین روش ساخت فولادهای ابزار به روشPM روش ASP(Anti-Segregetion Process)است .

3-1آلیاژهای ریخته گری شده کبالت

این آلیاژها بدون پایه آهن(حداکثر 0.05-0.02 ( و با پایه کبالت ساخته میشوند و دارای عناصر زیر هستند:

        عنصر                                        %عنصر

         کبالت                                          47-42

         کرم                                            32-25

         تنگستن                                       21-14

        عنصر                                       % عنصر

         کربن                                            4-2

         تانتالیوم                                        8-2

         منگنز                                           3-1

         آهن                                              5-2

        نیکل                                              7

این مواد در حقیقت پلی بین فولادهای تندبر و کاربیدهای سمانته هستند . سختی خود را در هنگام کار تا دمای خیلی بالاتری نسبت به HSS حفظ می کنند و در سرعتهای برش بالاتری تا 20% بیشتر نیز کار می کنند و بر عکس فولادهای تندبر که سختی خود را براساس عملیات حرارتی بدست می آورند، این آلیاژها در هنگام ریخته گری سختی خود را بدست می آورند و قابلیت نرم شدن وسخت شدن مجدد را ندارند . همانطور که گفته شد موارد کاربرد این مواد، در شرایط کاری ما بین کاربرد فولادهای تندبر و کاربیدهای سمانته است . نظیر سرعت های برشی، جنس قطعه کار، خشن تراشی یا پرداخت و ....

4-1کاربیدهای سمانته Comented Carbile                                                                      

کاربیدهای سمانته شامل یک خانواده از مواد سخت، مقاوم به سایش و مقاوم در مقابل درجه حرارت های بالا هستند که در آنها ذرات کاربیدی سخت بوسیله یک فلز واسطه نرم به یکدیگر چسبانیده می شوند . اولین کاربید ساخته شده، کاربید تنگستن WC با بایندر(Binder) کبالت بوده است. کبالت به عنوان بهترین بایندر در تولید کاربیدهای سمانته شناخته شده است و پایه WC-CO در تولید بیشتر کاربیدهای سمانته بکار می رود . بیش از 50%کاربیدهای تولید شده در ساخت ابزارهای برشی بکار می رود . نوع پر مصرف دیگر کاربیدها، کاربید تیتانیم با بایندر نیکل است . کاربیدهای سمانته، به روش متالورژی پودر و تحت مراحل بسیار دقیق وکنترل شده تولید می گردد تا در نهایت، از ساختار کارائی مطلوب برخوردار باشند. سیستم طبقه بندی کاربیدهای تنگستن که امروزه بیشترین مصرف را در صنعت ابزار برشی دارند بر طبق استانداردISO به صورت زیر است:

·   گروه های کاربید تنگستن پر آلیاژبرای ماشینکاری فولاد با حرف Pو به رنگ آبی

·   گروه های کاربید تنگستن کم آلیاژ برای ماشینکاری فولادهای سوپر آلیاژ با پایه نیکل (فولادهای زنگ نزن) و چدن داکتیل با حرف M و به رنگ زرد

·   گروه های کاربید تنگستن بدون عناصر آلیاژی (کاربیدی) برای ماشینکاری چدن خاکستری ، فلزات غیر آهنی و مواد غیر فلزی با حرف K و به رنگ قرمز

·   هر گروهی دارای اعدادی است که از ماگزیمم سختی به سمت ماگزیمم تافنس انتخاب کننده را راهنمائی می کنند:

P01    ****A    P50

M10   ****A   M40

K01    ****A   K40

5-1سرمتها Cermets                                                                                                 

سرمتها یک گروه از محصولات متالورژی پودر هستند که شامل ذرات سرامیک با یک چسب فلزی می باشند . ذرات سرامیک در این ترکیب سختی سرخ را بالا میبرند و مقاومت در مقابل سایش در حد بالائی را تامین می کنند و جزء فلزی ترکیب مقاومت در مقابل ضربه یا تافنس و مقاومت در مقابل شوک ها ی حرارتی را تضمین می کند. یک سرامیک در حقیقت یک اکسید فلزی، یک کاربید و یا مخلوطی از این مواد است. سرمتها مقاومت به سایش بسیار بالاتری نسبت به کاربیدهای سمانته دارند در کنار اینکه در سرعتهای برش خیلی بالاتری نیز کار می کنند اما از طرف دیگر استحکام سرمتها در حدود 15% تا 25% کمتر از استحکام کاربیدهای سمانته است . تافنس سرمتها نیز در مقایسه با کاربیدهای سمانته کمتر است و این کاربرد سرمتها در خشن تراشی را محدود می کند.

6-1سرامیک ها                                                                                             Ceramics

سرامیکها جدیدترین خانواده مواد ساخت ابزار هستند که برای استفاده در یک رنج وسیع عملیات پرداخت کاری و همچنین براده برداری زیاد از موادی که به سختی ماشینکاری می شوند بکار می روند . سرامیک هائی که در ساخت ابزار برش از آنها استفاده می شوند یا بر پایه اکسید آلومینیوم AL2O3 و یا بر پایه نیترید سیلسیم SC3N4 قرار دارند . سرامیکها سختی سرخ عالی و همچنین مقاومت در مقابل اکسیداسیون که مقدار خوردگی لبه ها را در دمای بالا کاهش می دهد در ساخت ابزار برشی مورد استفاده قرار گرفته اند. که این خواص سرامیکها را قادر می سازد که در سرعت های بالای ماشینکاری بالاتر از 300 m/min کار کنند، حتی بر روی فلزاتی که به سختی ماشین کاری می شوند.

اولین مشکل سرامیک ها در مقایسه با کاربیدهای سمانته، تافنس بسیار پائین آنهاست، علاوه بر این سرامیک ها مقاومت کمتری در مقابل شوک حرارتی دارند و همچنین دلایل کاربرد گسترده آنها را محدوده می سازد.

7-1مواد فوق سخت                                                                       Ultnahand Materials

الماس و CBN دو تا از بیشترین موادی هستند که تاکنون شناخته شده اند . هر دوی این مواد کاربردهای بی شماریدر صنایع دارند نظیر ساخت ساینده ها و ابزارهای برش فوق سخت . از ویژگی های الماس ماشینکاری مواد غیرآهنی است





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پنجشنبه بیست و سوم اردیبهشت 1389
مهندس سعید مودب
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We're having coffee at Nylon Coffee Roasters on Everton Park in Singapore.
I'm having black coffee, he's possessing a cappuccino.

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suited his face, hazel eyes and the most amazing lips I've seen. He is well-built, with incredible arms including
a chest that is unique about this sweater. We're standing in the front of each other talking about our lives, what we want money for hard times,
what we're interested in on another person. He starts saying that they have been rejected plenty
of times.

‘Why Andrew? You're so handsome. I'd never
reject you ', I say He smiles at me, biting his lip.


‘Oh, I don't know. Everything happens for grounds right.
But identify, would you reject me, would you Ana?' He said.


‘No, how could I?' , I replied

"So, you wouldn't mind if I kissed you today?' he was quoted saying as I purchase much better him and kiss him.

‘Next time don't ask, accomplish it.' I reply.

‘I prefer how you would think.' , he said.

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چهارشنبه دوازدهم تیر 1398 11:11 ب.ظ
مراكز سامسونج نعتبر خبراء سامسونج الاوائل فى مصر و احسن خدمة تبحث عنها عندما یواجهك اعطال فى
میكروویف سامسونج .حیث اننا نوفرالاصلاحبالكامل
فى منزل العمیل ولا یتم سحب الثلاجات نهائیا من منزلك هذا بجانباننانمتلك طاقم عمل من
فنیینمدربین على الصیانةالفورى لجمیع مشاكل اجهزة سامسونج الغسالات و استبدال
كل قطع الغیار العاطلةبأخرى ممتازةهذا ب الاضافة تمیزهم بالكفاءةالعالیة و التى تمكنهم
الاصلاحفورا منزل العمیل و الخبرة التى تصل الى الى سنواتطویلة لا تقل عن 21 عاممتواصلة فى اصلاح میكروویف سامسونج

اذا كنت فى احتیاج لعمل صیانة ثلاجات سامسونج
فى المنزل و كل ما علیك هو الاتصال بنا على مركز صیانة میكروویف سامسونج
فى مصر نحن فى خدمتك اینما كنت
نحن نخدم جمیع المحافظات لنسعى أن نكون الاول فى مجال عملنا و الاسرع فى التعامل معك و نقدم لك الصیانة فى
مختلف مودیلات شاشات سامسونج
سه شنبه یازدهم تیر 1398 06:12 ق.ظ
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پنجشنبه ششم تیر 1398 12:12 ق.ظ
We're having coffee at Nylon Coffee Roasters on Everton Park in Singapore.
I'm having black coffee, he's creating a cappuccino.

He is handsome. Brown hair slicked back, glasses for his face,
hazel eyes and the most wonderful lips I've seen. They're well built,
with incredible arms along with a chest that stands
apart within this sweater. We're standing in front of one another speaking about us, what we'd like for the future, what we're
looking for on another person. He starts telling me that they have been rejected plenty of times.


‘Why Andrew? You're so handsome. I'd never reject you ', I have faith that He smiles at me, biting his lip.


‘Oh, I can't know. Everything happens for good reason right.
But let me know, you wouldn't reject me, can you Ana?'
He said.

‘No, how could I?' , I replied

"So, utilize mind if I kissed you today?' he explained as I am closer to him and kiss him.

‘The next time don't ask, just do it.' I reply.

‘I love the method that you think.' , he said.

At the same time, I start scrubbing my your back heel in the leg, massaging it slowly. ‘What can you prefer ladies? And, Andrew, don't spare me the details.' I ask.

‘I really like determined women. Someone that knows what you want. Someone that won't say yes simply because I said yes. Someone who's unafraid when attemping something totally new,' he says. ‘I'm never afraid when attemping a new challenge, especially in terms of making interesting things in the bed room ', I intimate ‘And I like girls who are direct, who cut through the chase, like you only did. To get
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پنجشنبه سی ام خرداد 1398 09:23 ب.ظ
We're having coffee at Nylon Coffee Roasters on Everton Park in Singapore.
I'm having black coffee, he's creating a cappuccino.
He's handsome. Brown hair slicked back, glasses for his face, hazel eyes and the
most beautiful lips I've seen. They're well made, with incredible arms as
well as a chest that shines within this sweater. We're standing right
in front of one another talking about how we live, what we wish money for hard times, what
we're trying to find on another person. He starts telling me that he's got been rejected many times.


‘Why Andrew? You're so handsome. I'd never reject you
', I only say He smiles at me, biting his lip.

‘Oh, I would not know. Everything happens for a reason right.
But let me know, can you reject me, would you Ana?' He said.


‘No, how could I?' , I replied

"So, utilize mind if I kissed you right this moment?' he was quoted saying as I recieve better him and kiss him.

‘The next time don't ask, just do it.' I reply.

‘I like how you think.' , he said.

For the time being, I start scrubbing my heel bone in his leg, massaging it slowly. ‘What can you enjoy in females? And, Andrew, don't spare me the details.' I ask.

‘I like determined women. Someone to know what they want. Someone who won't say yes just because I said yes. Someone who's unafraid of attempting new things,' he says. ‘I'm never afraid when trying new stuff, especially on the subject of making a new challenge in the bed room ', I intimate ‘And I like girls that are direct, who cut with the chase, like you only did. Being
honest, that's a huge turn on.'
دوشنبه بیست و هفتم خرداد 1398 07:48 ق.ظ
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پنجشنبه نهم خرداد 1398 08:04 ق.ظ
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پنجشنبه نهم خرداد 1398 05:54 ق.ظ
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چهارشنبه هشتم خرداد 1398 08:00 ق.ظ
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یکشنبه پنجم خرداد 1398 01:08 ب.ظ
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پنجشنبه دوم خرداد 1398 12:10 ق.ظ
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شنبه بیست و هشتم اردیبهشت 1398 04:20 ب.ظ
"We should build to another crescendo, cheri," he said.
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پنجشنبه بیست و ششم اردیبهشت 1398 06:53 ب.ظ
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پنجشنبه بیست و ششم اردیبهشت 1398 01:04 ب.ظ
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