The development of balata pedestal

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  • source:WEINBERG CNC Machining
Summary: Pedestal of some car balata because appearance is special, the amount that use gum is larger, the product that introduces production of mould pressing structure is consisting the blemish such as heavy panel of light blanks, sodden bubble, flash, pass the improvement of pair of sizing material recipes, the mould designs optimize, improve by common tool set for transfer mould, better settlement above problem, reduced percent defective, product quality rises considerably. Keyword: Balata pedestal; Craft; Mould preface pursues 1 for balata pedestal diagram, by head of the base, reinforcement, ringent that prop up 4 parts are comprised this, the structure is more complex. Graph 1 mould structure designs 1 balata pedestal 1) is common tool set and pressure note shape the structure of commonner tool set of the mould is simple, cost is inferior, but put in the following problems. (1) because the structure is special, model place of antrum existence pointed horn, arrive hard when vulcanization makings, goods is put in the blemish such as light blanks, crackle, scar. (2) semi-manufactured goods makes difficulty, if do not accurate, sizing material holds modular core in the palm, when combining a model produce the phenomenon that gnaw a model extremely easily. (3) glue edge is too thick, the take time that decorate a border, arduous. (4) percent defective is taller. 2) transfer mould eliminates the cost that make taller outside, afore-mentioned problems but be readily solved, under photograph comparing, still use transfer mould to make more appropriate. The chooses this figure of 3) cent face is pedestal form, two upright substance are bigger, especially the head, curved surface is conterminous, form is complex, intermediate place is 6 body of one regulation, the book that there is one perforative floor among 12 via, base is all directions body, have 4 step aperture and baseplate link. According to its structure, fore-and-aft flying a model is impossible almost, the central line of 12 via divides choice towel model it is first-rate also be exclusive. But A-A and B-B are divided two kinds model how be chosen, still must make further analysis, if pursue,2 are shown. Graph 2 minutes model mask of form of choice A-A cent has the characteristic with small area, can form more opening number on same area that is to say, in order to improve manufacturing efficiency. But bring a lot of issues however, it is model antrum becomes deep, treatment difficulty is great, the mould increases growth of tall vulcanization time. 2 be semi-manufactured goods sizing material make and put makings is no-goer, produce the odds that gnaws a model to increase. And choice B-B cent face can make model antrum height decreases by 95mm for 50mm, treatment difficulty is reduced greatly, mould cost can drop 1/4, in the meantime, as a result of model of antrum become shallow, mould height attenuates accordingly, vulcanization time reduces 60s left and right sides. And use B-B cent face to be able to make full use of glue the head 31 × 26.

Of 3 square model planar, make modular core and fluctuation model antrum are contacted, in order to restrict the roll of direction of modular core X, this is helpful for improving product quality not only, and saved pin of a fixed position, simplified mould structure. Integration analysis, use benefit of B-B cent side to be more than fraud. Graph balata of 3 pedestal type this goods of respect of sizing material of design of recipe of 2 sizing material belongs to mould structure diagram damping kind balata, divide outside having good flexibility, sizing material still must have better liquidity, in order to decrease model the light blanks appearance that antrum floor pointed corner handles. Additionally this goods is used material is more, increase 20 reclaimed rubber from the angle that reduces cost, won't cause very big effect to goods function. Add on 10 butadiene rubber additionally and in order to rises plasticate and the function that mix refine, sizing material recipe is emphasized in this two respects to undertake transforming, in order to improve its performance. Reduced the proportion of filler via improving the recipe after, fill strong dose adopts appropriate dosage, make two respects raise sizing material above somewhat. Affirmatory recipe is as follows: 20 4 of reclaimed rubber of 10 3 of butadiene rubber of 80 2 of 1 natural balata is sulfureous 1.

CZ 0 of 2 5 accelerant.

B 0 of age resistor of 4010 1 10 of age resistor of D 1 9 of age resistor of acerbity 2 8 of tristearin of 3 7 of 8 6 zinc oxide.

Carbon black of 1 12 of 3 11 olefin 5 physics of × of Min 143 of × of ℃ of 25 vulcanization condition are mechanical 300 ％ extend function surely puissant Mpa 7.

9-8.

8 hardness (Shao) 50-55 pulls Mpa 10 of tear strength of 595-632 of percentage elongation ％ .

The production A material of 9 3 mould: 45b heat treatment: The form of the heat treatment mould of mould of D of workmanship of HRC28 ～ 33c is more complex, because pedestal is bottom deeper and horn having a tip exists, treatment of CNC Machining center is not quite convenient also, still be electric spark treatment is more appropriate. Its process is: (1) get the materials ready: 240 × of 240 × 35mm semifinished product expects two, 150 × of 240 × 55mm together. (2) rough machining, according to mould dimension, leave surplus 1.

5mm, modular core semifinished product leaves surplus 1.

2mm. (3) heat treatment: Move qualitative HRC28-33. (4) semifinishing machining. (5) half essence is ground, essence of life grinds fluctuation plane. (6) machining center makes modular core. (7) antrum of model of fluctuation of electric spark treatment. (8) polishing, burr of purify pointed horn. (9) mould finishing. If use general accuracy machine tool to machine modular core, must make model, the treatment of example can be made with line cut. When modular core is machined must as complete as example conform to, otherwise goods is easy occurrence amlposition, thickness not the blemish such as divide evenly. The mould is had besides requirement matrix in the job enough of high intensity and tenacity reasonable outside cooperating, its surface function is crucial to the character of service of the mould and service life. These exterior function point to: Wear-resisting caustic function, corrosion resistance can, coefficient of friction, fatigue function. The improvement of these function, pure the improvement that depends on base material and rising is very finite, also be wasteful, and adopt finishing technique, often can get the result of get twice the result with half the effort, this also is the account that finishing technology gets developing quickly. The finishing technology of the mould, it is to adopt modified of exterior besmear Fu, surface or compound processing technique, structure of the pattern that changes mould face, chemical composition, organization and stress condition, in order to win a systematic project that wants exterior performance. From the means of finishing, can divide again for: Chemical method, physics method, physico-chemical method and mechanical method. Although aim to improve the processing technology with mould surface new property ceaseless emerge in large numbers, but medium applying is made in the mould more basically is nitriding, cementite and sclerotic film deposit. Nitriding craft has the kind such as aeriform nitriding, ionic nitriding, liquid nitriding, in means of nitriding of avery kind of, have a certain number of planting nitriding technology, can get used to different steel to plant the requirement of different workpiece. Because nitriding technology can form the surface of good performance, and of nitriding craft and mould steel quench craft has good harmonious sex, nitriding temperature is low at the same time, nitriding hind does not require intense refrigeration, of the mould be out of shape dinky, because the exterior aggrandizement of this mould is,use nitriding technology earlier, also be application is the widest. After mould finish machining is finished, hardness is inferior, if be not handled,use, pointed horn place can be brought about very quickly because of all sorts of reasons wear away, must have the surface or vacuum heat treatment so, considering this batch is not too big, using finishing is more appropriate. Equipment of vulcanization of 4 vulcanization craft: XLB/630KN leaves quickly add up to condition of vulcanization of model vulcanization machine: 143 pressure of temperature ℃ preparation of sizing material of 10Mpa time 8min: When semi-manufactured goods is made, should avoid to touch moisture, foreign matter. Outfit model and craft (1) reduces size 100 × the cuboid of 30 × 4mm reserves. (2) will heat ending mould procrastinates piece, open pressure note a place of strategic importance (3) sizing material bends, will press note antrum to fill every model place to want sizing material. (4) presses the alignment that note a place of strategic importance note antrum to be put. (5) pushs vulcanization machine pressurization to note glue, 8min asks when vulcanization. (6) takes out the pattern from inside vulcanization machine. (7) leaves pressure note a place of strategic importance, put at a side. (8) removes upper mould, put at a side. (9) gets off modular core with tool having a model. (Tool having a model must be made with brass) (park of core of 10) general model is special tool of drawing of patterns, the bottom plane that uses balata pedestal gets off goods, finish loop of a craft thereby. 5 conclusion use above plan to press the balata pedestal of outpour, the exterior is neat, mural thickness is even, do not have when drawing of patterns tear off, wait for a phenomenon without light blanks, sodden bubble, scar, comparable easy get off from modular core, the effect is idealer. CNC Milling