spyder jackets outlet The recovery of waste by _57

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The recovery of waste by die

Production in the feast with a certain significance. Key words phase transition theory of martensite Jiangxi Albright off the bolt fastener plant cold heading steel die is manufactured using TlDA. In the manufacturing process will produce a certain amount of mold hole diameter tolerance, distortion for the bell to affect production. If we can make use of the waste recovery mode is a certain economic value. Therefore, we conducted a variety of process test} obtained by plugging the last hole heat treatment process can reduce the die and resume use of the hole size. Die in the hole so that the heat treatment narrowing curve as shown. 1. In order to achieve the overall heating the mold evenly flap generated when I reduce the heat stress the purpose, the first repeal the preheating mode to 400C. 2. Then the waste mold is heated to the phase transition temperature Acz ~ 20C or so, to avoid overheating and a thermal insulation to touch even after the use of wood (or asbestos) blocked both ends of the mold clamping (to prevent the cooling water into the eight in the hole), the rapid input Wang should at a temperature of 730 ~ 750 �� heating and cooling within the bore after the shrinkage of up to 0.06mm. We are 213 M10, Mlt bolts die shrinkage method for the above test results of 180 to the ground before the hole shrink the size of the {die Sunburn waste recovery rate of 85% utilization. we all know, steel heated to a temperature below the phase transition,[link widoczny dla zalogowanych], in the subsequent cooling process will produce thermal expansion and contraction, Our heat treatment process is to develop a mechanism-based Plaza. In general the steel and heat through the heating temperature is higher, the better plastic, and vice versa, but if heated to above the phase transition temperature of steel Austrian Act s body to king of the workpiece not only from the cold in the fast heat shrink 1989-12-30 Received 92 * expansion, but also one by one to generate new phase transition stress of stress. Therefore, we will waste Die try to control the heating temperature in the range of 730 �� 20 ��, not to produce excessive austenitic workpiece. In fact, often the surface of the mold in the heating has reached the austenitized and speed in the subsequent cold salt water solution is bound to die certain thickness of the surface martensite. In this process,[link widoczny dla zalogowanych], the contraction of the die bore a party but because the outer surface of the mold at about 700 �� abrupt cooling produced a strong compressive stress (bulk stress), resulting in plastic the inner surface layer of the better inside a corresponding contraction} On the other hand the surface of the mold produced a greater specific volume of martensite formed by the tissue pressure stress, the two South integration, lead swelled to some extent the hole volume contraction. 3. Following the above treatment, the die sizes shrink to conform to the hole size before grinding requirements} but for the entire mold,[link widoczny dla zalogowanych], but there are some internal stress. it should be followed by a certain temperature tempering (500 ~ 54o ��) to remove all internal stress, but also will be quenched with a good balance between performance organizations. 4. has been restored for the application of these die within a hole the size of production, must then make the necessary internal hole machining , hardened and ground. by means of the heat treatment to restore the die to reach the recycling is feasible. and put into production by the Ministry after the barrier to reach the official life of the product. but according to the test found the following issues need to continue to explore . (1) the use of wood (or asbestos pull) in the two knock blocking tight mold cooling water into the hole to prevent the use of appropriate tools must be holding them close. because the seal is not good,[link widoczny dla zalogowanych], can not be expected to produce results even make the hole oval. from practice that the use of wood better. (2) is far more closely with wooden grip but easy to burn, such as blocking the use of asbestos pull tight bore special fixtures may have some effect. (3) the length of the mold 70ram big or equal to the hole will be presented when the drum-type. (4) Our factory bolt diameter of the die is generally 50ram,[link widoczny dla zalogowanych], according to experimental observation, the die bore diameter of 4mm and 16ram Shuo machine contraction is excellent, and the hole diameter ~ Smm, when the machine is less Omm.
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