Gansu Dingxi High Strength Screw Co., Ltd. uses a large number of different types of ball mills in the national mine dressing industry. Due to the harsh use of the ball mill, in order to protect the service life of the outer cylinder, a protective plate (liner) is installed in the cylinder, which is made of cast high manganese steel ZGMnl3 and cast on the liner for connection. The irregular countersunk elliptical taper holes are fastened, and a large number of non-standard special shaped bolts are used to install the lining plates in a row.
It is a special-shaped bolt for fastening the lining on the ball mill. The specification is M30mmX130mm and the material is 35 steel. The installation amount of each billiard mill is large, and the machining method of machining the bolt head every 34 months is difficult to form, and the material utilization rate is low, the productivity is low, and the cost is high. After the change to the hot forging head one-time forming process, after mass production, it not only meets the needs of users, but also improves productivity.
The head of the ball mill bolt is an elliptical cone, and the rod must be machined before the head is formed. If the head is forged and formed, and then the rod is machined, it will bring certain difficulties and inconveniences to the machining of the card, and the efficiency is low, which affects the production. When selecting a blank, it is generally necessary to satisfy the minimum diameter used for the stem portion, and not to exceed the maximum range of the upsetting ratio, and the primary forming is the optimum condition.
030mmx201mm (the length of the head material is 71mm).
The amount of grinding required is 27.70+rQmm. The threadless shaft is 0mm and is not processed.
Hot upset forging the head section with 71mm full heating, die forging the head.
The car goes to the head end and the flash burrs.
The head of the bolt is formed by the lower die. The lower die is designed as shown in the figure. The material is made of hot die steel 32W8V and the heat treatment hardness is 4248HRC. In order to make the upper die convenient, a process punch (see) is designed, and the shape is the workpiece head. Form, the punch cavity is used to form the lower model cavity. The lower mold blank is first made in the center to make a coarse hole smaller than the punch. After the blank is heated, the blank is punched into the cavity, and then the other geometrical dimensions of the finished vehicle are shaped, and the final heat treatment of the polishing cavity is performed to meet the requirements of use. mold. See the mold structure diagram.
Process Punch Mold Structure Drawing Selection and Calculation of Die Molding Die Box Blanks The workpiece rod is short, the coaxiality of the threadless rod diameter and the thread segment is not high, and the threadless rod diameter does not need to be re-machined. Processing, so the blank emblem å›” Changchun Locomotive & Rolling Stock Co., Ltd. (Heilongjiang 130052) The plate piston used in the passenger car brake cylinder of Jiang Libin (see) is made by turning the flanged cup blank (see) after shrinking. It is difficult to process by general methods, but it is very easy to implement by stamping.
The plate piston blank drawing uses the Q235A steel plate to realize the mouth of the cup, and must have radial force. The hydraulic press is a vertical feed, so the inner and outer molds in the press mold are tapered here, and the die structure is seen.
The structure of the shrink mold is shown. Upper die inner mold workpiece outer die 5. stripper 7. The return spring has rebound after considering the punching port, and the clearance between the inner and outer molds is C< 25. In order to facilitate the release and take-out, the inner and outer parts are used. After the whole mold is processed, it is evenly cut into 4 pieces in the diameter direction by wire cutting, and the periphery is polished smoothly.
In order to adapt to mass production, the inner and outer molds can be made of T8, and other parts can use 45 steel. The mold has a simple structure and is easy to use. As long as different inner and outer molds are replaced, the 430 mm round steel can be punched with different specifications of the plate diameter. The total blanking length is equal to the head material plus the length of the stem. The volume of the head geometry is difficult to calculate accurately by mathematical calculations, so the length of the head material cannot be calculated directly by the volume-invariant method. To this end, we use the process punch that punches the lower die, and the head volume is determined by weighing and then the length of the head material is determined by the volume. Therefore, the total length of the process material for the workpiece material is accurately determined, and the pre-production work is completed for mass production.
The weight of the 28.6mm segment handle is: the actual head weight G=(0.575 head material length 3 Pan fly edge burr amount due to the technical needs, there are certain flash burrs and 1.5~2mm processing during the upsetting process The head is elliptical, and its flash is actually a random shape that diffuses around the ellipse. Here, we assume that the flash edge extends 2.5mm (one side) in the direction of the original ellipse, that is, the ellipse is long and short. The half shaft is increased by 2.5mm. According to the ellipsoid, the length of the flash is L=―3 The total length of the blank required for the workpiece is total L = the length of the head material + the length of the flash material + the length of the rod = (65
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