Arc gear pump housing requires two holes high precision machining. In the medium and small batch production, the general use of general-purpose machine tools and special tooling to processing, this processing method is difficult to achieve accuracy requirements. Circular arc gear pump processing two holes of the process, a hole 12.5 for the 7, and the two holes limit the size of different; large hole R18.41 close to 8; coaxial, verticality, position tolerance requirements, in particular Position tolerance is very small. Therefore, the hole is difficult to process. Since the second process of hole machining is the key process, only the fixture design of this process is introduced here. (1) fixture program and structure: Select the pump body G surface and two 9 diagonal holes for the positioning of the fixture with two pins on one side positioning. Linear indexing form. Clamp the part with two hook clamps. Figure 2 shows the structure of the fixture (Note: the figure shows only the key dimensions and the main part number). Clamp body 1 is an angle iron, with screws, tapered pins mounted on the carriage. Moving indexing block 2 and clamp body 1 through the dovetail guide rail, and with the bolt 3 lock. The indexing block 2 is provided with a cylindrical pin 4 and a chamfered pin 9 by which the part is positioned on the indexing block 2 and is pressed by the two hook- Seat 6 is used to support the rear end of the tool. With hand-drawn cylindrical indexing on the agency. For the convenience of operation, the workpiece is installed on the right side of the fixture, and the fixture body is provided with holes on the indexing block for the tool to enter the workpiece processing. In order to prevent the chips from entering the joining surfaces of the members 1 and 2, the chip holder 10 is fitted in the hole of the clip body 1. (2) Fixture features: The principle of benchmark coincidence, positioning error is small, higher indexing accuracy. Tool support at both ends, beating small, high precision machining hole size. Clamping reliable, easy to operate. The long-term use of proof, can fully guarantee the processing accuracy requirements, the downside is the process of observation is not convenient. (3) Fixture operation: Put the work piece into the two locating pins, tighten the hook-shaped platen nut and move the carriage longitudinally to insert the cylinder pin of the fixed mechanism 15 into the pin hole of the first hole. After machining the first hole, loosen the two lock nuts 3, pull out the cylinder pin of the alignment mechanism 15, move the index block 2 so that the cylinder pin of the alignment mechanism 15 is inserted into the second hole Pin hole, and tighten the nut 3, the processing of the second hole. (4) fixture installation requirements: manufacturing, the indexing agencies on the cylinder pin and bushing 12 with the preparation, with the gap of not more than 0.01mm. Installation, to ensure that the fixture center line K and spindle lathe coaxiality, coaxial tolerance of 0.015mm. P positioning and positioning of the lathe spindle axis perpendicular to the tolerance of 0.02mm. When the fixture is installed and adjusted, the horizontal feed must be locked, and the vertical feed should be set as dead stop iron.
Classification of tablet press: Models can be divided into single punch tablet press, rotary tablet press, sub-high speed rotary tablet press, automatic high speed tablet press and rotary core tablet press.
The sheet shape pressed by the tablet press is initially flat circular, and later developed into shallow circular arc and deep circular arc on both sides, which is for the need of coating. With the development of special-shaped tablet press, oval, triangle, oblong, square, diamond, circular ring tablets followed. In addition, with the continuous development of preparations, due to the requirements of compound preparations and timed release preparations, special tablets such as double layer, triple layer and core coating are made, which need to be completed on special tablet press.
Rotary tablet press is a machine which is made of several pairs of die distributed on the turntable to make a circular lifting movement according to a certain track and press the granular material into tablet through the press wheel. And the stamping rod with the rotary table rotating speed ≥60m/min line press is called high-speed rotary tablet press, this high-speed rotary tablet press has a forced feeding mechanism, the machine is controlled by PLC, has the automatic adjustment of pressure, control the weight of the piece, eliminate the waste piece, print data, display fault shutdown and other functions, in addition to the control of the weight difference within a certain range, Quality problems such as missing Angle and loose lobe can be automatically identified and eliminated.
With the development of market demand, the scope of application of tablet press is more and more wide, no longer simply limited to the suppression of Chinese and Western medicine tablets, more widely suppressed health food, veterinary medicine tablets, chemical tablets: such as mothballs, washing blocks, smurf blocks, art powder, pesticide tablets, food tablets: chicken essence block, isatis root block, divine Qu tea block, compressed biscuits.
Rotary Tablet Press,Tablet Press,Tablet Machine,Tablet Maker,Pill Machine JIANGYIN CITY XUAN TENG MACHINERY EQUIPMENT CO.,LTD , https://www.xuantengmixer.com