二級(jí)圓柱齒輪減速器及鏜孔工序夾具設(shè)計(jì)（含CAD圖紙+文檔）
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外文資料
Introduction of Machining Process
As a method of shape generation, mechanical processing is the most common and important method in all manufacturing processes. Machining process is a process of generating shape. In this process, the driving device makes some materials on the workpiece be removed in the form of chips. Although in some cases, the workpiece can not bear the situation, the use of mobile equipment to achieve processing, but most of the mechanical processing is through both supporting the workpiece and supporting tool equipment to complete. There are two aspects in the process of knowledge processing. Small batch production costs less. For casting, forging and pressure processing, every specific shape of the workpiece to be produced, even a part, almost costs a lot of processing costs. The structural shape produced by welding depends to a large extent on the form of effective raw materials. Generally speaking, through the use of valuable equipment without special processing conditions, almost any kind of raw materials can be started, with the aid of mechanical processing to process raw materials into any required structural shape, as long as the external size is large enough, that is possible. Therefore, for the production of a part, even when the structure of the part and the batch size to be produced are suitable for casting, forging or pressure processing, but usually mechanical processing is preferred. Rigorous accuracy and good surface finish, the second use of mechanical processing is based on high accuracy and possible surface finish. Many parts, if produced in large quantities by other means, are produced in small quantities with low tolerances and satisfying requirements in mechanical processing. On the other hand, many parts improve their general surface shape by rough processing technology, but only in the need for high precision and selected surface to be machined. For example, the internal thread, in addition to mechanical processing, almost no other processing methods can be processed. If the forged workpiece on the small hole processing, is also forged immediately after the completion of mechanical processing.
1.Basic Machining Parameters
The basic relationship between workpiece and tool in cutting is fully described by the following four factors: the geometry of tool, cutting speed, feed speed and back feed. Cutting tools must be made of a suitable material. They must be strong, tough, hard and wear-resistant. The geometric shape of the tool is characterized by the plane of the tool tip and the angle of the tool. It must be correct for every cutting process. Cutting speed is the rate at which the cutting edge passes through the surface of the workpiece. It is expressed in inches per minute. In order to process effectively, the cutting speed must be adapted to the matching of specific workpiece and cutting tool. Generally speaking, the harder the workpiece material is, the lower the speed is. Feed speed is the speed at which the tool cuts into the workpiece. If the workpiece or tool rotates, the feed is measured in inches per turn. When the cutter or workpiece moves back and forth, the feed is measured in inches per stroke. Generally speaking, when other conditions are the same, the feed rate is inversely proportional to the cutting speed. Back feed is measured in inches as the distance the tool enters the workpiece. It is equal to the chip width in rotary cutting or the chip thickness in linear cutting. Rough processing is deeper than finishing.
2.Tool Wear
From the numerous brittle cracks and edge cracks that have been treated, there are basically three types of tool wear: flank wear, rake wear and V-notch wear. The wear of flank occurs on both the main blade and the auxiliary blade. As for the main cutting edge, because it undertakes the task of cutting most metal chips, it leads to increasing cutting force and increasing cutting temperature. If it is left unchecked, it may lead to vibration of the tool and workpiece and the condition of effective cutting may no longer exist. As for the auxiliary blade, it determines the size and surface finish of the workpiece. The wear of the flank may result in substandard products and poor surface finish. Under most actual cutting conditions, the tool will be effective when the wear of the main rake face is larger than that of the secondary rake face, resulting in unqualified parts. Because of the uneven distribution of stress on the tool surface, the stress in the sliding contact area between the chip and the front tool face is the largest at the beginning of the sliding contact area, while it is zero at the end of the contact area, so abrasive wear occurs in this area. This is because there is more serious wear near the cutting block than near the blade, and the wear near the blade is lighter due to the loss of contact between the chip and the rake face. This results in pitting on the rake face at a certain distance from the cutting edge, which is usually considered as wear on the rake face. Usually, the wear cross section is circular. In many cases and for actual cutting conditions, the wear of rake face is lighter than that of flank face, so the wear of flank face is more commonly used as the scale sign of tool failure. However, as many authors have indicated, the temperature on the rake face rises faster than that on the flank face with increasing cutting speed, and the wear rate in any form is essentially affected by temperature changes. Therefore, the wear of rake face usually occurs in high-speed cutting. The tail of the main flank wear belt of the tool is in contact with the surface of the unprocessed workpiece, so the flank wear is more obvious than along the end of the wear belt, which is the most common. This is due to the local effect, which is like the hardened layer on the unprocessed surface. This effect is caused by the hardening of the workpiece caused by the previous cutting. Not only cutting, but also local high temperature produced by the blade, such as oxide skin, can cause this effect. This kind of local wear is usually called pitting wear and is occasionally very serious. Although the appearance of concave pits has no substantial impact on the cutting properties of the tool, the concave pits often deepen gradually. If the cutting continues, the tool will be in danger of fracture. If any progressive form of wear is allowed to continue to develop, the ultimate wear rate will increase significantly and the tool will have destructive failure damage, that is, the tool will no longer be used for cutting, resulting in the scrap of the workpiece, that is good, serious machine tool damage can be caused. For all kinds of cemented carbide tools and for all kinds of wear, it is considered that the end of tool life cycle has been reached before serious failure occurs. However, for all kinds of high-speed steel tools, the wear is non-uniform. It has been found that when the wear permits continuous or even serious failure, the most significant thing is that the tool can be used for regrinding. Of course, in practice, the cutting time is much shorter than the time when the tool is used for failure. One of the following phenomena is the characteristic of the beginning of tool failure: the most common is the sudden increase of cutting force, the serious increase of burnout rings and noise on the workpiece, etc.
3. The influence of cutting parameters on cutting temperature
In metal cutting operation, heat occurs in the main deformation zone and the secondary deformation zone. This results in complex temperature distributions throughout cutters, workpieces and chips. The figure shows a set of typical isothermal curves, from which it can be seen that, as can be expected, when the workpiece material is cut in the main deformation zone, there is a large temperature gradient along the whole chip width, while in the sub-deformation zone, when the chip is cut off, there is a higher temperature on the rake face near the chip. This results in higher cutting temperature near the cutting edge of the rake face and chips. In essence, because all the functions in metal cutting are converted into heat, it can be predicted that these factors, which consume Zeng's unit volume power of the cut metal, will increase the cutting temperature. When the rake angle of the tool increases and all other parameters remain unchanged, the power consumption per unit volume of the cutting metal will be reduced, and the cutting temperature will also be reduced. This situation is even more complicated when considering the increase of undeformed chip thickness and cutting speed. The increasing trend of undeformed chip thickness will lead to a proportional effect on the total heat passing through the workpiece. Tools and chips still maintain a fixed proportion, while the change of cutting temperature tends to decrease. However, with the increase of cutting speed, the amount of heat transferred to the workpiece decreases, which in turn increases the chip temperature rise in the main deformation zone. Furthermore, the sub-deformation zone is bound to be smaller, which will have a warming effect in this area. The change of other cutting parameters has no effect on the unit volume consumption of the cut, so it has no effect on the cutting temperature in fact. Because facts have shown that even a small change in cutting temperature will have a substantial impact on tool wear rate. This shows that it is appropriate to determine the cutting temperature from the cutting parameters. The most direct and accurate method for measuring the temperature of HSS cutters is the Wright-Trent method, which provides detailed information on the temperature distribution of HSS cutters. This technology is based on the metallographic microscopic measurement of high-speed steel tool cross-section. The aim is to establish the relationship between the microstructural change and the thermal change law. Wright has discussed the method of measuring cutting temperature and temperature distribution of HSS tools when processing a wide range of workpiece materials. This technology has been further developed by using electron microscopic scanning technology. The purpose of this technology is to study the microstructural changes caused by tempering high-speed steels with various martensitic structures. This technique is also used to study the temperature distribution of single point turning tools and twist drills for high speed steel.
4. Design of Automatic Fixture
The traditional synchronous fixture used for assembling equipment moves the parts to the center of the fixture to ensure that the parts are removed from the conveyor or from the device disc and placed on the positioned position. However, in some applications, forcing parts to move to the central line may cause parts or equipment damage. When parts are fragile and small vibration may lead to scrap, or when the position is specified by the spindle or die of the machine tool, or when the tolerance requirements are very precise, it is preferable to let the fixture adapt to the position of the parts, rather than vice versa. For these tasks, Zaytran, Elyria, Ohio, USA, has developed asynchronous Western-type flexibility fixtures for general functional data. Because the clamp force and synchronization device are independent, the synchronization device can be replaced by a precise sliding device without affecting the clamp force. Fixture specifications range from 0.2 inch stroke, 5 pound clamping force to 6 inch stroke, 400 inch clamping force. The characteristic of modern production is that the batch size is becoming smaller and smaller, and the product specifications change most. Therefore, in the final stage of production, assembly is particularly vulnerable due to changes in production plans, batches and product designs. This situation is forcing many companies to devote more efforts to extensive rationalization reforms and assembly automation as mentioned earlier. Although the development of flexible fixture is lagging behind the development of flexible transportation processing equipment, such as industrial robots, it is still trying to increase the flexibility of fixture. In fact, the special investment of production equipment, an important fixture device, strengthens the economic support of making fixture more flexible. According to their flexibility, fixtures can be divided into: special fixtures, modular fixtures, standard fixtures, high flexible fixtures. Flexible fixtures are characterized by their high adaptability to different workpieces and low cost of replacement. Flexible fixtures with changeable structural forms are equipped with parts with changeable structural arrangements (such as needle-shaped buccal plates, multi-piece parts and sheet-shaped buccal plates), non-special clamping or clamping elements for standard workpieces (such as starting standard clamping fixtures and fixture fittings with movable components), or ceramic or hardened intermediates (such as flow particle bed fixtures and thermal fixtures). Tighten clamp. In order to produce, parts need to be tightened in fixtures. There are several steps which have nothing to do with the flexibility of fixtures. According to the part processed, i.e. the basic part and the working characteristics, the required position of the workpiece in the fixture is determined. Then the combination of several stable planes must be selected. These stable planes constitute the clamping of the workpiece fixed in the fixture to determine its position. The shape contour structure balances all forces and moments, and ensures that it is close to the working characteristics of the workpiece. Finally, it is necessary to calculate, adjust and assemble the required positions of dismountable or standard fixture elements so that the workpiece can be firmly clamped in the fixture. According to this program, the contour structure and assembly planning and recording process of fixture can be controlled automatically. The task of structural modeling is to produce a combination of several stable planes, so that the clamping forces on these planes will stabilize the workpiece and fixture. Traditionally, this task can be accomplished in a man-machine conversation, which is almost fully automated. One-man-machine conversation, that is to say, the advantage of automatic fixture structure modeling is that it can organize and plan fixture design, reduce the required designers, shorten the research cycle and better configure working conditions. In short, it can successfully improve the production efficiency and efficiency of fixture. With the full preparation of the construction scheme and a batch of materials, the first assembly can successfully save up to 60% of the time.
The use of automatic fixture can reduce manpower and facilitate rhythmic production. The use of automatic fixtures instead of people to work, this is a direct reduction of manpower - one side, together because the use of automatic fixtures can be connected to the work, this is another side of reducing manpower. Therefore, in the inductive processing active line of automated machine tools, there is no automatic fixture at present, in order to reduce manpower and more precise control of the production rhythm, so as to facilitate the rhythmic operation of production.
The use of automatic fixture is conducive to the degree of initiative in data transmission, workpiece loading and unloading, tool replacement and machine installation, and then can improve labor productivity and reduce production costs.
中文譯文
機(jī)械加工過程介紹
作為產(chǎn)生形狀的一種加工方法，機(jī)械加工是所有制造過程中最普遍使用的而且是最重要的方法。機(jī)械加工過程是一個(gè)產(chǎn)生形狀的過程，在這過程中，驅(qū)動(dòng)裝置使工件上的一些材料以切屑的形式被去除。盡管在某些場(chǎng)合，工件無(wú)承受的情況下，使用移動(dòng)式裝備來(lái)實(shí)現(xiàn)加工，但大多數(shù)的機(jī)械加工是通過既支承工件又支承刀具的裝備來(lái)完成。加工知識(shí)的過程有兩個(gè)方面。小批生產(chǎn)低費(fèi)用。對(duì)于鑄造、鍛造和壓力加工，每一個(gè)要生產(chǎn)的具體工件形狀，即使是一個(gè)零件，幾乎都要花費(fèi)高額的加工費(fèi)用。靠焊接來(lái)產(chǎn)生的結(jié)構(gòu)形狀，在很大程度上取決于有效的原材料的形式。一般來(lái)說(shuō)，通過利用貴重設(shè)備而又無(wú)需特種加工條件下，幾乎可以以任何種類原材料開始，借助機(jī)械加工把原材料加工成任意所需要的結(jié)構(gòu)形狀，只要外部尺寸足夠大，那都是可能的。因此對(duì)于生產(chǎn)一個(gè)零件，甚至當(dāng)零件結(jié)構(gòu)及要生產(chǎn)的批量大小上按原來(lái)都適于用鑄造、鍛造或者壓力加工來(lái)生產(chǎn)的，但通常寧可選擇機(jī)械加工。嚴(yán)密的精度和良好的表面光潔度，機(jī)械加工的第二方面用途是建立在高精度和可能的表面光潔度基礎(chǔ)上。許多零件，如果用別的其他方法來(lái)生產(chǎn)屬于大批量生產(chǎn)的話，那么在機(jī)械加工中則是屬于低公差且又能滿足要求的小批量生產(chǎn)了。另方面，許多零件靠較粗的生產(chǎn)加工工藝提高其一般表面形狀，而僅僅是在需要高精度的且選擇過的表面才進(jìn)行機(jī)械加工。例如內(nèi)螺紋，除了機(jī)械加工之外，幾乎沒有別的加工方法能進(jìn)行加工。又如已鍛工件上的小孔加工，也是被鍛后緊接著進(jìn)行機(jī)械加工才完成的。?
1?基本的機(jī)械加工參數(shù)
切削中工件與刀具的基本關(guān)系是以以下四個(gè)要素來(lái)充分描述的：刀具的幾何形狀，切削速度，進(jìn)給速度，和背吃刀量。切削刀具必須用一種合適的材料來(lái)制造，它必須是強(qiáng)固、韌性好、堅(jiān)硬而且耐磨的。刀具的幾何形狀以刀尖平面和刀具角為特征，對(duì)于每一種切削工藝都必須是正確的。切削速度是切削刃通過工件表面的速率，它是以每分鐘英寸來(lái)表示。為了有效地加工，切削速度高低必須適應(yīng)特定的工件與刀具配合。一般來(lái)說(shuō)，工件材料越硬，速度越低。進(jìn)給速度是刀具切進(jìn)工件的速度。若工件或刀具作旋轉(zhuǎn)運(yùn)動(dòng)，進(jìn)給量是以每轉(zhuǎn)轉(zhuǎn)過的英寸數(shù)目來(lái)度量的。當(dāng)?shù)毒呋蚬ぜ魍鶑?fù)運(yùn)動(dòng)時(shí)，進(jìn)給量是以每一行程走過的英寸數(shù)度量的。一般來(lái)說(shuō)，在其他條件相同時(shí)，進(jìn)給量與切削速度成反比。背吃刀量以英寸計(jì)是刀具進(jìn)入工件的距離。它等于旋削中的切屑寬度或者等于線性切削中的切屑的厚度。粗加工比起精加工來(lái)，吃刀深度較深。?
2?刀具磨損??
從已經(jīng)被處理過的無(wú)數(shù)脆裂和刃口裂紋的刀具中可知，刀具磨損基本上有三種形式：后刀面磨損，前刀面磨損和V型凹口磨損。后刀面磨損既發(fā)生在主刀刃上也發(fā)生副刀刃上。關(guān)于主刀刃，因其擔(dān)負(fù)切除大部金屬切屑任務(wù)，這就導(dǎo)致增加切削力和提高切削溫度，如果聽任而不加以檢查處理，那可能導(dǎo)致刀具和工件發(fā)生振動(dòng)且使有效切削的條件可能不再存在。關(guān)于副刀刃，那是決定著工件的尺寸和表面光潔度的，后刀面磨損可能造成尺寸不合格的產(chǎn)品而且表面光潔度也差。在大多數(shù)實(shí)際切削條件下，由于主前刀面先于副前刀面磨損，磨損到達(dá)足夠大時(shí)，刀具將實(shí)效，結(jié)果是制成不合格零件。由于刀具表面上的應(yīng)力分布不均勻，切屑和前刀面之間滑動(dòng)接觸區(qū)應(yīng)力，在滑動(dòng)接觸區(qū)的起始處最大，而在接觸區(qū)的尾部為零，這樣磨蝕性磨損在這個(gè)區(qū)域發(fā)生了。這是因?yàn)樵谇邢骺ㄗ^(qū)附近比刀刃附近發(fā)生更嚴(yán)重的磨損，而刀刃附近因切屑與前刀面失去接觸而磨損較輕。這結(jié)果離切削刃一定距離處的前刀面上形成麻點(diǎn)凹坑，這些通常被認(rèn)為是前刀面的磨損。通常情況下，這磨損橫斷面是圓弧形的。在許多情況中和對(duì)于實(shí)際的切削狀況而言，前刀面磨損比起后刀面磨損要輕，因此后刀面磨損更普遍地作為刀具失效的尺度標(biāo)志。然而因許多作者已經(jīng)表示過的那樣在增加切削速度情況下，前刀面上的溫度比后刀面上的溫度升得更快，而且又因任何形式的磨損率實(shí)質(zhì)上是受到溫度變化的重大影響。因此前刀面的磨損通常在高速切削時(shí)發(fā)生的。刀具的主后刀面磨損帶的尾部是跟未加工過的工件表面相接觸，因此后刀面磨損比沿著磨損帶末端處更為明顯，那是最普通的。這是因?yàn)榫植啃?yīng)，這像未加工表面上的已硬化層，這效應(yīng)是由前面的切削引起的工件硬化造成的。不只是切削，還有像氧化皮，刀刃產(chǎn)生的局部高溫也都會(huì)引起這種效應(yīng)。這種局部磨損通常稱作為凹坑性磨損，而且偶爾是非常嚴(yán)重的。盡管凹坑的出現(xiàn)對(duì)刀具的切削性質(zhì)無(wú)實(shí)質(zhì)意義的影響，但凹坑常常逐漸變深，如果切削在繼續(xù)進(jìn)行的話，那么刀具就存在斷裂的危機(jī)。如果任何進(jìn)行性形式的磨損任由繼續(xù)發(fā)展，最終磨損速率明顯地增加而刀具將會(huì)有摧毀性失效破壞，即刀具將不能再用作切削，造成工件報(bào)廢，那算是好的，嚴(yán)重的可造成機(jī)床破壞。對(duì)于各種硬質(zhì)合金刀具和對(duì)于各種類型的磨損，在發(fā)生嚴(yán)重失效前，就認(rèn)為已達(dá)到刀具的使用壽命周期的終點(diǎn)。然而對(duì)于各種高速鋼刀具，其磨損是屬于非均勻性磨損，已經(jīng)發(fā)現(xiàn)：當(dāng)其磨損允許連續(xù)甚至到嚴(yán)重失效開始，最有意義的是該刀具可以獲得重磨使用，當(dāng)然，在實(shí)際上，切削時(shí)間遠(yuǎn)比使用到失效的時(shí)間短。以下幾種現(xiàn)象之一均是刀具嚴(yán)重失效開始的特征：最普遍的是切削力突然增加，在工件上出現(xiàn)燒損環(huán)紋和噪音嚴(yán)重增加等。?
3?切削參數(shù)的改變對(duì)切削溫度的影響??
金屬切削操作中，熱是在主變形區(qū)和副變形區(qū)發(fā)生的。這結(jié)果導(dǎo)致復(fù)雜的溫度分布遍及刀具、工件和切屑。圖中顯示了一組典型等溫曲線，從中可以看出：像所能預(yù)料的那樣，當(dāng)工件材料在主變形區(qū)被切削時(shí)，沿著整個(gè)切屑的寬度上有著很大的溫度梯度，而當(dāng)在副變形區(qū)，切屑被切落時(shí)，切屑附近的前刀面上就有更高的溫度。這導(dǎo)致了前刀面和切屑離切削刃很近的地方切削溫度較高。實(shí)質(zhì)上由于在金屬切削中所做的全部功能都被轉(zhuǎn)化為熱，那就可以預(yù)料：被切離金屬的單位體積功率消耗曾家的這些因素就將使切削溫度升高。這樣刀具前角的增加而所有其他參數(shù)不變時(shí)，將使切離金屬的單位體積所耗功率減小，因而切削溫度也將降低。當(dāng)考慮到未變形切屑厚度增加和切削速度，這情形就更是復(fù)雜。未變形切屑厚度的增加趨勢(shì)必導(dǎo)致通過工件的熱的總數(shù)上產(chǎn)生比例效應(yīng)，刀具和切屑仍保持著固定的比例，而切削溫度變化傾向于降低。然而切削速度的增加，傳導(dǎo)到工件上的熱的數(shù)量減少而這又增加主變形區(qū)中的切屑溫升。進(jìn)而副變形區(qū)勢(shì)必更小，這將在該區(qū)內(nèi)產(chǎn)生升溫效應(yīng)。其他切削參數(shù)的變化，實(shí)質(zhì)上對(duì)于被切離的單位體積消耗上并沒有什么影響，因此實(shí)際上對(duì)切削溫度沒有什么作用。因?yàn)槭聦?shí)已經(jīng)表明：切削溫度即使有小小的變化對(duì)刀具磨損率都將有實(shí)質(zhì)意義的影響作用。這表明如何人從切削參數(shù)來(lái)確定切削溫度那是很合適的。測(cè)定高速鋼刀具溫度的最直接和最精確的方法是萊特＆特倫特法，這方法也就是可提供高速鋼刀具溫度分布的詳細(xì)信息的方法。該項(xiàng)技術(shù)是建立在高速鋼刀具截面金相顯微測(cè)試基礎(chǔ)上，目的是要建立顯微結(jié)構(gòu)變化與熱變化規(guī)律圖線關(guān)系式。當(dāng)要加工廣泛的工件材料時(shí)，萊特已經(jīng)論述過測(cè)定高速鋼刀具的切削溫度及溫度分布的方法。這項(xiàng)技術(shù)由于利用電子顯微掃描技術(shù)已經(jīng)進(jìn)一步發(fā)展，目的是要研究將已回過火和各種馬氏體結(jié)構(gòu)的高速鋼再回火引起的微觀顯微結(jié)構(gòu)變化情況。這項(xiàng)技術(shù)亦用于研究高速鋼單點(diǎn)車刀和麻花鉆的溫度分布。?
4?自動(dòng)夾具設(shè)計(jì)??
用做裝配設(shè)備的傳統(tǒng)同步夾具把零件移動(dòng)到夾具中心上，以確保零件從傳送機(jī)上或從設(shè)備盤上取出后置于已定位置上。然而在某些應(yīng)用場(chǎng)合、強(qiáng)制零件移動(dòng)到中心線上時(shí)，可能引起零件或設(shè)備破壞。當(dāng)零件易損而且小小振動(dòng)可能導(dǎo)致報(bào)廢時(shí)，或當(dāng)其位置是由機(jī)床主軸或模具來(lái)具體時(shí)，再或者當(dāng)公差要求很精密時(shí)，那寧可讓夾具去適應(yīng)零件位置，而不是相反。為著這些工作任務(wù)，美國(guó)俄亥俄州Elyria的Zaytran公司已經(jīng)開發(fā)了一般性功能數(shù)據(jù)的非同步西類柔順性?shī)A具。因?yàn)閵A具作用力和同步化裝置是各自獨(dú)立的，該同步裝置可以用精密的滑移裝置來(lái)替換而不影響夾具作用力。夾具規(guī)格范圍是從0.2英寸行程，5英鎊夾緊力到6英寸行程、400英寸夾緊力。現(xiàn)代生產(chǎn)的特征是批量變得越來(lái)越小而產(chǎn)品的各種規(guī)格變化最大。因此，生產(chǎn)的最后階段，裝配因生產(chǎn)計(jì)劃、批量和產(chǎn)品設(shè)計(jì)的變更而顯得特別脆弱。這種情形正迫使許多公司更多地致力于廣泛的合理化改革和前面提到過情況那樣裝配自動(dòng)化。盡管柔性?shī)A具的發(fā)展很快落后與柔性運(yùn)輸處理裝置的發(fā)展，如落后于工業(yè)機(jī)器人的發(fā)展，但仍然試圖指望增加夾具的柔順性。事實(shí)上夾具的重要的裝置——生產(chǎn)裝置的專向投資就加強(qiáng)了使夾具更加柔性化在經(jīng)濟(jì)上的支持。根據(jù)它們?nèi)犴樞裕瑠A具可以分為：專用夾具、組合夾具、標(biāo)準(zhǔn)夾具、高柔性?shī)A具。柔性?shī)A具是以它們對(duì)不同工件的高適應(yīng)性和以少更換低費(fèi)用為特征的。結(jié)構(gòu)形式可變換的柔性?shī)A具裝有可變更結(jié)構(gòu)排列的零件（例如針形頰板，多片式零件和片狀頰板），標(biāo)準(zhǔn)工件的非專用夾持或夾緊元件（例如：?jiǎn)?dòng)標(biāo)準(zhǔn)夾持夾具和帶有可移動(dòng)元件的夾具配套件），或者裝有陶瓷或硬化了的中介物質(zhì)（如：流動(dòng)粒子床夾具和熱夾具緊夾具）。為了生產(chǎn)，零件要在夾具中被緊固，需要產(chǎn)生夾緊作用，其有幾個(gè)與夾具柔順性無(wú)關(guān)的步驟：根據(jù)被加工的即基礎(chǔ)的部分和工作特點(diǎn)，確定工件在夾具中的所需的位置，接著必須選擇若干穩(wěn)定平面的組合，這些穩(wěn)定平面就構(gòu)成工件被固定在夾具中確定位置上的夾持狀輪廓結(jié)構(gòu)，均衡所有各力和力矩，而且保證接近工件工作特點(diǎn)。最后，必須計(jì)算、調(diào)整、組裝可拆裝的或標(biāo)準(zhǔn)夾具元件的所需位置，以便使工件牢牢地被夾緊在夾具中。依據(jù)這樣的程序，夾具的輪廓結(jié)構(gòu)和裝合的規(guī)劃和記錄過程可以進(jìn)行自動(dòng)化控制。?結(jié)構(gòu)造型任務(wù)就是要產(chǎn)生若干穩(wěn)定平面的組合，這樣在這些平面上的各夾緊力將使工件和夾具穩(wěn)定。按慣例，這個(gè)任務(wù)可用人—機(jī)對(duì)話即幾乎完全自動(dòng)化的方式來(lái)完成。一人—機(jī)對(duì)話即以自動(dòng)化方式確定夾具結(jié)構(gòu)造型的優(yōu)點(diǎn)是可以有組織有規(guī)劃進(jìn)行夾具設(shè)計(jì)，減少所需的設(shè)計(jì)人員，縮短研究周期和能更好地配置工作條件。簡(jiǎn)言之，可成功地達(dá)到顯著提高夾具生產(chǎn)效率和效益。在充分準(zhǔn)備了構(gòu)造方案和一批材料情況下，在完成首次組裝可以成功實(shí)現(xiàn)節(jié)約時(shí)間達(dá)60%。
自動(dòng)夾具的使用能夠減輕人力，并便于有節(jié)奏的出產(chǎn)。使用自動(dòng)夾具代替人進(jìn)行作業(yè)，這是直接削減人力的-個(gè)旁邊面，一起因?yàn)槭褂米詣?dòng)夾具能夠接連的作業(yè)，這是削減人力的另一個(gè)旁邊面。因而，在主動(dòng)化機(jī)床的歸納加工主動(dòng)線上，當(dāng)前簡(jiǎn)直都沒有自動(dòng)夾具，以削減人力和更精準(zhǔn)的操控出產(chǎn)的節(jié)拍，便于有節(jié)奏的進(jìn)行作業(yè)出產(chǎn)。
使用自動(dòng)夾具有利于完成資料的傳送、工件的裝卸、刀具的替換以及機(jī)器的安裝等的主動(dòng)化的程
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