冷沖模具使用壽命外文翻譯

1、 冷沖模具使用壽命的影響1冷沖模具的使用壽命是以沖制出的工件數(shù)量來計算的。影響冷沖模壽命的因素很多。主要有模具結(jié)構(gòu)設(shè)計、制造模具所用凸模和凹模的材料、模具的熱處理質(zhì)量與表面強(qiáng)化、沖模零件的制造精度和冷沖壓材料的選取。除此之外，還有沖模的安裝、調(diào)整、使用以及維修等。1模具設(shè)計對壽命的影響(1)排樣設(shè)計的影響排樣方法與搭邊值對模具壽命的影響很大，過小的搭邊值，往往是造成模具急劇磨損和凸、凹?？袀闹匾颉墓?jié)約材料出發(fā)，搭邊值愈小愈好，但搭邊值小于一定數(shù)值后，對模具壽命和剪切表面質(zhì)量不利。在沖裁中有可能被拉人模具問隙中，使零件產(chǎn)生毛刺，甚至損壞模具刃口，降低模具壽命。因此，在考慮提高材料利用率的

2、同時，必須根據(jù)零件產(chǎn)量、質(zhì)量和壽命，確定排樣方法和搭邊值。(2)凹模結(jié)構(gòu)的影響對容易產(chǎn)生應(yīng)力集中而開裂的凹模結(jié)構(gòu)，可以采用組合結(jié)構(gòu)或鑲拼結(jié)構(gòu)，以及預(yù)應(yīng)力結(jié)構(gòu)，從而提高模具使用壽命。(3)間隙的影響當(dāng)間隙過小時，壓縮擠壓利害，摩擦力增大，磨損增大，側(cè)面的磨損加劇，沖裁后卸料和推件時，材料與凸、凹模之間的摩擦還將造成刃口側(cè)面的磨損比端面的磨大大，同時也容易造成凸、凹模溫度很高，把金屬碎屑吸附在刃口側(cè)面，形成金屬瘤，使凸、凹模出現(xiàn)崩刃或脹裂現(xiàn)象。因此，過小的間隙對模具壽命極為不利。間隙太大，會增加凸模與凹模端面邊緣的集中應(yīng)力，致使壓應(yīng)力急劇增加，于是刃口邊很快屈服變形而失去棱角。因此又增加了沖裁力，

3、進(jìn)而使刃口邊更快磨損，降低模具壽命。但為了減小凸、凹模的磨損，延長模具使用壽命，在保證沖裁件質(zhì)量的前提下，設(shè)計時適當(dāng)采用較大間隙是十分必要的。(4)模具導(dǎo)向結(jié)構(gòu)對壽命的影響可靠的導(dǎo)向?qū)τ跍p小工作零件的磨損，避免凸、凹?？袀欠浅Ｓ行У摹Ｌ貏e對無問隙或小問隙沖裁模、復(fù)合模和多工位級進(jìn)模更為重要。為提高模具壽命，必須根據(jù)工序和零件精度要求，正確選擇導(dǎo)向形式和導(dǎo)向精度，所選擇導(dǎo)向精度應(yīng)高于凸、凹模的配合精度。(5)冷沖壓材料選取的影響冷沖壓材料應(yīng)滿足制件的設(shè)計要求和沖壓工藝要求，否則容易損傷模具，降低模具使用壽命。冷沖壓材料表面質(zhì)量不好，沖壓時制件易破裂，也易擦傷模具。冷沖壓材料塑性不好，變形量小，

4、沖壓時制件易破裂，也易擦傷模具。另外，材料的厚度公差應(yīng)符合國家標(biāo)準(zhǔn)。因為一副沖模適用于一定材料的厚度，成形、彎曲、翻邊、引伸模具的凸、凹模結(jié)構(gòu)間隙是直接根據(jù)材料厚度來確定的。所以材料厚度不均勻，會導(dǎo)致廢品產(chǎn)生和模具損壞。2模具材料對模具壽命的影響模具材料對模具壽命的影響是模具材料性質(zhì)、化學(xué)成分、組織結(jié)構(gòu)、硬度和冶金質(zhì)量等的綜合反映。其中，材料性質(zhì)和熱處理質(zhì)量影響最為明顯。模具材料性質(zhì)對模具壽命的影響是很大的。如將同一種工件，使用不同的模具材料做彎曲試驗，試驗結(jié)果：用9mn2v材料，其壽命為5萬次；用crl2mov滲氮，其壽命可達(dá)40萬次。因此，在選用材料時，應(yīng)根據(jù)制件的批量大小，合理選用模具材

5、料。模具工作零件的硬度對模具壽命的影響也很大。但并不是硬度愈高、模具壽命愈長。這是因為硬度與強(qiáng)度、韌性及耐磨性等有密切的關(guān)系。有的沖模要求硬度高，壽命長。如采用t10鋼制造沖模，硬度為5458hrc，只沖幾千次，制件毛刺就很大。如果將硬度提高到6064hrc，則刃磨壽命可達(dá)23萬次。但如果繼續(xù)提高硬度，則會出現(xiàn)早期斷裂。有的沖模硬度不宜過高，如采用crl2mov制造凹模硬度為5862hrc時，一般壽命為23萬件，失效形式是崩刃和開裂以及如果將硬度降到5458hrc，壽命提高到56萬件，但硬度降低到5053hrc會出現(xiàn)凹模刃口易磨鈍現(xiàn)象。由此可見，模具硬度必須根據(jù)材料性質(zhì)和失效形式而定。應(yīng)使硬度

6、、強(qiáng)度、韌性及耐磨性、耐疲勞強(qiáng)度等達(dá)到特定沖壓工序所需要的最佳配合。3模具的熱處理質(zhì)量與表面強(qiáng)化對壽命的影響模具的熱處理質(zhì)量對模具的性質(zhì)與使用壽命影響很大。實踐證明，模具工作零件的淬火變形與開裂，使用過程中早期斷裂，雖然與材料的冶金質(zhì)量、鍛造質(zhì)量、模具結(jié)構(gòu)及加工有關(guān)，但與模具的熱處理關(guān)系更大。根據(jù)模具失效原因的分析統(tǒng)計，熱處理不當(dāng)引起的失效占50 以上。實踐證明，高級的模具材料必須配以正確的熱處理工藝，才能真正發(fā)揮材料的潛力。模具工作零件表面強(qiáng)化處理的目的，是獲得外硬內(nèi)韌的效果，從而得到硬度、耐磨性、韌性、耐疲勞強(qiáng)度的良好配合。模具表面強(qiáng)化處理方法很多，表面處理的新技術(shù)工藝發(fā)展很快。除氮碳共滲

7、和離子氮化、滲硼、滲鈮、滲釩、表面鍍硬鉻和電火花強(qiáng)化外，化學(xué)氣相沉積(cvd)和物理氣相沉積(pvd)已逐步采用。經(jīng)cvd和pvd處理后，模具表面覆蓋一層超硬物質(zhì)，如tic、tin等。硬度極高、耐磨性、耐蝕性、抗黏合性很好，可提高模具壽命幾倍到幾十倍。4沖模零件的制造精度對模具壽命的影響沖模制造的精度與使用壽命關(guān)系很大，特別是模具表面粗糙度對模具影響很大。如用crl2mov鋼制造落料模，如果表面粗糙度值r =16 m時，其壽命為3萬件左右。如經(jīng)精拋光，表面粗糙度值r =04 m，壽命可提高到45萬件。因此，對模具工作零件表面，一般都要經(jīng)過磨削、研磨、拋光等精加工和精細(xì)加工。5其他方面對模具壽命

8、的影響(1)壓力機(jī)的精度不高，也易使沖模損壞。(2)沖模在壓力機(jī)上安裝的正確與否及操作者的技術(shù)水平高低，對模具壽命也有很大影響。(3)沖模的保管和維護(hù)好壞，以及使用潤滑劑的情況，也影響模具使用壽命。冷沖模凸凹模間隙控制和調(diào)整方法冷沖壓模具凸、凹模間隙的大小和均勻程度直接影響沖裁件的質(zhì)量和模具的使用壽命的長短。在保證沖裁件間隙時裝配也是模具制造中十分重要的環(huán)節(jié)，而且裝配質(zhì)量將直接影響凸、凹模的間隙是否均勻。比如加工時凸、凹模的尺寸精度雖已達(dá)到要求，但是在裝配時如果調(diào)整不好，就會造成間隙不均勻，沖出的零件有毛邊。甚至?xí)_出不合格的零件。模具裝配的關(guān)鍵是要控制凸、凹模的相對位置，以保證凸、凹模的間隙

9、正確、均勻并能沖出合格的零件。1.模具在裝配前應(yīng)關(guān)注的問題2 凸、凹模間隙既與模具本身零件的精度有關(guān)，也與裝配時的裝配工藝是否合理有關(guān)。為了保證凸、凹模的位置正確和間隙均勻，模具從設(shè)計、加工到裝配整個環(huán)節(jié)要注意的問題如下：（1）凸、凹模的正確設(shè)計和制造 設(shè)計模具時首先應(yīng)根據(jù)沖裁件的斷面質(zhì)量、模具使用壽命等因素選擇合理的凸、凹模間隙。并要考慮到模具在使用過程中的磨損使間隙增大，一般在設(shè)計模具時采用最小合理間隙。并在制造過程中保證模具零件的加工質(zhì)量和精度，在裝配過程中確保凸、凹模間隙均勻，這對于加工復(fù)雜形狀零件十分關(guān)鍵。（2）裝配方法的選擇要合理 沖模裝配方法大致包括直接裝配法和配合裝配法。裝配前

10、必須仔細(xì)研究模具裝配圖，充分考慮和分析沖模的結(jié)構(gòu)特點、沖模零件加工工藝和加工精度等，以選擇方便、準(zhǔn)確、可靠的裝配方法以保證沖裁件質(zhì)量。2.凸、凹模間隙的控制與調(diào)整的方法【3】 凸、凹模的間隙控制，應(yīng)根據(jù)沖模結(jié)構(gòu)、間隙大小、沖裁件的質(zhì)量和實際裝配條件來選定。凸、凹模間隙的控制與調(diào)整方法有以下幾種。（1） 透光法 將凸、凹模合模后，用光照射底面，觀察凸、凹模刃口周圍透過的光線和分布情況來判斷間隙的大小和均勻性。如果不均勻，重新調(diào)整至間隙均勻后再固定，此法適用于薄板小間隙沖裁模。（2） 塞尺法 將凸、凹模合模后，用凸、凹模單邊間隙厚度的塞尺塞入凸、凹模各方向間隙中。然后擰緊上模固定螺釘。最后放紙試沖

11、，最后將上模座與固定板配鉆、鉸定位銷孔，并打人銷釘定位。（3）墊片調(diào)整法墊片調(diào)整間隙法簡便、應(yīng)用廣泛。如圖1所示，合模后墊好等高墊鐵，將墊片包在凸模上使凸模進(jìn)入凹模內(nèi)，觀察凸、凹模的間隙狀況。如果間隙不均勻，用敲擊凸模固定板的方法調(diào)整間隙，然后擰緊上模固定螺釘。最后放紙試沖，觀察切紙上四周毛刺均勻程度，從而判斷凸、凹模間隙是否均勻，再調(diào)整間隙直至沖裁毛刺均勻為止。最后將上模座與固定板配鉆、鉸定位銷孔，并打入銷釘定位。這種方法廣泛適用于沖裁材料較厚的大間隙沖模和彎曲、拉深成形模具的間隙控制。（4）化學(xué)法 當(dāng)凸、凹模的形狀復(fù)雜時，用上述幾種方法調(diào)整間隙較困難時，這時可用化學(xué)方法來控制間隙，常用的是

12、電鍍法。電鍍法是在凸模工作端表面鍍上一層銅或鋅來代替墊片。鍍層厚度與單邊隙相同，刃人凹模孔內(nèi)，檢查上下移動無阻滯現(xiàn)象即可裝配緊固。鍍層在沖模使用過程中會自然脫落，無需去除。此法鍍層均勻，可提高裝配間隙的均勻性。（5）工藝措施調(diào)整法采用工藝措施調(diào)整模具間隙主要有2種方法：1.尺寸法 加工凸模時，將凸模前端適當(dāng)加長，加長段截面尺寸加工到與凹模型孔尺寸相同。裝配時，使凸模進(jìn)入凹模型孔，自然形成沖裁間隙，然后將凸模連同凸模固定板一起與上模座配作銷釘固定，最后將凸模前端加長段去除即可形成均勻間隙。2.定位孔法 工藝定位孔法就和級進(jìn)模里面的原理差不多。加工時，在凸模固定板和凹模相同的位置上加工兩定位孔，可

13、將定位孔與模具型腔一次割出。裝配時，在定位孔內(nèi)插入定位銷來保證間隙。（6） 標(biāo)準(zhǔn)樣板法 根據(jù)零件圖預(yù)先在線切割機(jī)床上加工一標(biāo)準(zhǔn)樣板或采用合格沖壓零件，裝配調(diào)整時將其放在凸、凹模之間，使上、下模相對運動時松緊程度適當(dāng)即可。（7） 測量法 測量法采用的測量工具有塞尺。塞尺測量法調(diào)整后的凸、凹模間隙均勻性好，是常用的方法。裝配時，在凸模刃口放入凹模孔內(nèi)后，根據(jù)凸、凹模間隙的大小選擇不同規(guī)格的塞尺插入凸、凹模間隙中，檢查凹模刃口周邊各處間隙，并根據(jù)測量結(jié)果進(jìn)行調(diào)整。調(diào)整時只要敲擊凸模固定板直至調(diào)整好為止。(8)調(diào)整修配法 沖模在使用一段時間后，由于凸、凹模的正常磨損。要對所加工的零件進(jìn)行檢查，若制品產(chǎn)

14、生毛刺，凸、凹模刃口變鈍和崩刃因素，則是因為凸、凹模間隙因磨損發(fā)生了變化，即變大或不均勻。為使凸、凹?；謴?fù)到原來的間隙值沖出合格零件可采用以下方法進(jìn)行修配。1. 凸、凹模間隙變大的修配方法 一般沖模在使用一段時間后，由于正常磨損會使凸、凹模間隙逐漸增大，從而使工件產(chǎn)生毛刺等一系列的問題。這種情況下，可先用厚度等于單面間隙值的塊規(guī)插入凸、凹模刃口之間，若凸、凹模間隙不太大，修磨工作部分的刃口繼續(xù)使用，可改善沖件質(zhì)量。當(dāng)間隙值過大時，則可采高溫加熱后局部鍛打的方法重新修正凹模尺寸使其恢復(fù)到原來的間隙值。工件冷卻后，再用壓印銼修法重新修整間隙值，并用火焰表面淬火的方法來提高刃口表面的硬度。2. 凸、

15、凹模間隙不均勻的修配方法 沖模使用一段時間后，間隙不均勻會使沖件局部邊緣產(chǎn)生毛刺或刃口被咬壞。在沖模正常磨損情況下，由于導(dǎo)向裝置磨損后精度降低使得凸、凹模相對發(fā)生偏移，應(yīng)分別在導(dǎo)柱和導(dǎo)套上鍍一層鉻使其恢復(fù)到原來的尺寸，再通過壓印銼修法將高點去除。如果是由于定位銷松動失去定位作用而致使凸、凹模不同心，從而引起凸、凹模間隙不均勻。應(yīng)先將凸、凹模間隙調(diào)整好，重新配作銷釘固定。die life of cold stamping die and influence die with the life of the workpiece by punching out the number of terms

16、. many factors affect the life die. there are die structure design, manufacture molds used in the punch and die materials, die quality and surface hardening heat treatment, precision die manufacturing parts and cold stamping materials selection. in addition, there are die installation, adjustment, u

17、se and maintenance. 1. die design on life (1) layout design of layout methods and take the boundary value a great impact on the die life, too small to take the boundary value, often causing rapid wear and convex mold, die bite wounds on the. starting from material savings, take the boundary value sm

18、aller the better, but take the edge is less than some value, the cut surface of the mold and the quality of life adversely. there will be left behind in the blanking die q-gap were to produce spare parts glitch, or even damage the die edge, reduce die life. therefore, consider increasing the materia

19、l utilization of the same time, parts must yield, quality and life expectancy to determine the layout methods and take the boundary. (2) die structure prone to stress concentration on the cracking of the die structure, composite structure can be used or mosaic structure, and prestressed structure to

20、 enhance the mold life. (3) the impact of clearance when the gap is too small, compressed extrusion of interest, increased friction, increased wear, the wear side of aggravated discharge and push pieces after blanking time, materials and convex, the friction between die will cause wear and tear than

21、 the end edge on the side of the grinding much, but also easily lead to convex, concave mold temperature is high, the adsorption of metal debris in the side edge to form a metal tumor, so that male and female die chipping or expansion occurs crack phenomenon. therefore, the gap is too small to die l

22、ife very bad. gap is too large will increase the punch and the die face the edge of the concentration of stress, resulting in a sharp increase in stress, so blade edge quickly lose angular yield deformation. therefore, addition of blanking force, thereby enabling faster edge edge wear, reduce die li

23、fe. but in order to reduce the male and female die wear, extending mold life, while ensuring quality of stamping pieces under the premise that larger space designed properly it is necessary. (4) die-oriented structure of the life of a reliable guide for the working parts reduce wear, prevent male an

24、d female die bite wound is very effective. in particular, non-small-q gap q gap or die, compound die and multi-position progressive die even more important. to improve the die life, must be based on processes and the demand of precision, the correct choice-oriented form and orientation accuracy, the

25、 choice should be higher than the accuracy-oriented convex, concave mold with precision. (5) the impact of cold stamping materials, cold stamping materials selected should meet the design requirements of workpieces and stamping process requirements, or easy to mold damage and reduce mold life. poor

26、surface quality of cold stamping, punching, cracking when the workpiece is also easy to scratch mold. bad cold stamping plastic materials, deformation is small, easy to press when the workpiece rupture, but also easy to scratch mold. in addition, the material thickness tolerances shall comply with n

27、ational standards. die because of a certain thickness of material suitable for forming, bending, flanging, drawing die of the male and female die structure gap is directly determined by the thickness of the material. therefore, uneven thickness, will result in waste generation and mold damage. 2. di

28、e die life of die die life of a mold material properties, chemical composition, structure, hardness and comprehensive reflection of metallurgical quality. among them, the material properties and heat treatment affect the quality of the most obvious. mold material properties on the impact of die life

29、 is great. if the same workpiece, using a different mold material of the bending test, the test results: the 9mn2v material, the life of 5 million; with crl2mov nitriding, the life of up to 40 million. therefore, the choice of materials, the batch size should be based on workpiece, rational use of m

30、old materials. the hardness of the die parts to die life a great impact. but not the higher hardness, longer die life. this is because the hardness and strength, toughness and abrasion resistance are closely related. some die demands of high hardness, long life. such as the use of t10 steel dies, ha

31、rdness 54 58hrc, only washed thousands of times a burr on the workpiece great. if the hardness to 60 64hrc, the grinding life of up to 2 to 3 million. however, if continue to improve hardness, fracture occurs earlier. some die hardness should not be too high, as the die manufacturing using crl2mov 5

32、8 62hrc hardness, the general life of 2-3 million, invalid form of chipping and cracking, and if the hardness down to 54 58hrc, life expectancy increased to 5 60 000, but decreased to 50 53hrc hardness appears easy to blunt the die edge phenomenon. thus, mold hardness must be based on material prope

33、rties and failure modes may be. should enable the hardness, strength, toughness and wear resistance, resistance to fatigue strength needed to achieve a particular stamping process the best match. 3. the surface of the mold heat treatment to strengthen the quality and impact on life mold heat treatme

34、nt the nature and quality of life of the mold a great impact. practice shows that the die parts of the quenching distortion and cracking, early fracture during use, while the metallurgical and materials quality, forging quality, mold structure and process related, but related more to die of heat tre

35、atment. according to statistical analysis of failure causes of mold, heat treatment failure due to improper accounting for more than 50%. practice shows that the mold material must be accompanied by high heat treatment process properly, can really play a materials potential. parts surface hardening

36、mold work purpose is to obtain the effect of external hard tough inside, so be hardness, wear resistance, toughness, good resistance to fatigue with. many ways to die surface hardening, surface treatment technology of new technologies developed rapidly. in addition to nitrocarburizing and ion nitrid

37、e, boride, seepage niobium, vanadium permeability, hard chrome plated and spark strengthening, the chemical vapor deposition (cvd) and physical vapor deposition (pvd) has been gradually adopted. by cvd and pvd treatment, the mold surface covered with super-hard material, such as tic, tin, etc. high

38、hardness, wear resistance, corrosion resistance, adhesion is very good, can improve the die life several times to several times. 4. manufacturing precision of the die parts of die life precision die manufacturing and life in it in particular, mold surface roughness on the mold a great impact. if usi

39、ng crl2mov steel blanking die, if the surface roughness value r = 1.6 m, its life span is about 30,000. such as polished by the precision, surface roughness value r = 0.4 m, life can be increased to 4-5 million. therefore, the working parts of the mold surface, the general must go through grinding,

40、grinding, polishing and other finishing and fine processing. 5. other aspects of the impact of die life (1) press the accuracy is not high, but also easy to make die damage. (2) die in the press or not installed properly and the operators technical level, on the tool life is also greatly affected. (

41、3) dies in the custody and maintenance of good and bad, and the use of lubricant condition also affects mold life.cold die clearances between control and adjusting methodcold stamping mould convex, concave die size and distribution of the clearance degree directly affect the quality of the blanking

42、pieces and the length of the service life of the die. in guarantee blanking pieces space is mould manufacturing assembly very important link, and assembly quality will directly influence the convex, concave die if the clearance between the uniform. such as the process of convex, concave die size pre

43、cision although already meet the requirements, but in assembling if adjustment is bad, can cause clearance does not even, rushed out of the spare parts of the raw edges. even rushed out of unqualified parts. the mold assembly is key to control convex, concave die of relative positions, in order to e

44、nsure that the convex, concave die, uniform and the clearance between the right to rush out of qualified parts. 1. die before assembly the problems that should be paid attention2 convex, concave die and mould parts itself is clearance of the precision, and the assembly of the assembly process is rea

45、sonable. in order to ensure that the position of the convex, concave die correctly and gaps even, mould design, processing to assembly from the whole link should pay attention to the following questions： （1）convex, concave die design and manufacture of the right design should be based on the above a

46、ll when die cutting the section of a quality, service life of die factors such as the reasonable selection of convex, concave die clearance. and to consider the mould in the process of using that gap wear increases, general in the design the least reasonable clearance when mould. and in the manufact

47、uring process can ensure the parts processing precision and quality, in the assembly process ensure convex, concave die gap even, this for processing complex shape is very key parts. （2）assembly method the choice should be reasonable die assembly method include roughly assembly method and direct wit

48、h assembly method. before the assembly must be carefully study mold assembly drawing, full consideration and analysis of the structure characteristics of punching die, die parts processing technology and processing accuracy etc, in order to choose convenient, accurate and reliable assembly method to

49、 ensure the quality of blanking pieces. 2. convex, concave die gap between the control and adjustment of the method3 convex, concave die clearance control, should according to die structure, clearance size, blanking pieces of quality and practical assembly condition to selected. convex, concave die

50、gap between the control and adjustment method have the following kinds. （1）pervious to light method will convex, concave die after molmerged, shone a light on the underside, observe the convex, concave die around through light and distribution to judge the size of the clearance and uniformity. if no

51、t even, to adjust to evenly between fixed again, this method is suitable for small gap plate stamping die. （2）feeler method will convex, concave die after molmerged, convex, concave die into the thickness of unilateral clearance feeler convex, concave die gaps in each direction. then tighten the scr

52、ew on mode. finally put paper to stamping and will last mould seat and fixed on board with drilling, reaming positioning pin hole, and at a pin location. （3）gaskets diaozhengfa gasket adjustment method is simple, convenient, clearance is used widely. as shown in figure 1 shows, the mat with good con

53、tour mat iron, will gaskets wrapped in the punch to the punch into the concave mould, observe the convex, concave die clearance condition. if clearance does not even, with striking the protruding models of fixed plate method clearance adjustment, then tighten the screw on mode. finally put paper to

54、stamping, observation on paper cutting around burr and even rate to judge whether clearance convex, concave die even, to adjust the gap until cutting burr uniform so far. finally the mould seat and the plate with drilling, reaming positioning pin hole, and enter the pin location. this method widely

55、used cutting materials focusing thick large clearance and bending stamping, deep drawing mould clearance control. (4) chemical method when the convex, concave die complex shape, the use of the above several methods more difficult to adjust the gap, the chemical method can be used to control the gap,

56、 the plating method is used. plating method is the punch in the work surface coated with copper or zinc instead of washers. the plating thickness and unilateral gap is same, blade people concave die hole, and check the move without block phenomenon can assembly tighten. coating in use process will d

57、ie fall off naturally, need not removed. this uniform coating, can improve the uniformity of assembling clearance. (5) technology diaozhengfa measures the main technological measures to adjust the gap between two kinds of the mould method: 1. size method processing of the punch, will the punch front

58、-end appropriate lengthen, extended period of section size and sunken model hole processing to the same size. assembly, make the punch into female model hole, natural form the cutting clearance, and then to the punch with fixed together with the punch mould seat on board with the pin for fixed and will last longer period of the punch front can remove form even clearance. 2. positioning hole method process positioning hole method and the inside of the progressive die principle about. processing, the punch in fixed board and concave die on the same position processing two positioning