An improved milling fixture for eccentric upper head flange

Abstract

The invention discloses an improved hole milling clamp for an eccentric upper sealing head flange. The improved hole milling clamp comprises a positioning ring, a positioning disc, air cylinders, electromagnetic valves and pressing heads, a set of circular-arc-shaped side walls and an eccentric positioning pin are arranged on the positioning disc, the circular-arc-shaped side walls form a cylindrical excircle, the inner-side surface of each circular-arc-shaped side wall and an end-portion plane are connected through a bevel, two bevels form a conical face, a cushion block is arranged on the positioning disc, and the middle portion of the cushion block is cut to form a diversion groove; the air cylinders extend and contract to drive the pressing heads to press or release a workpiece, a cooling liquid pipeline is arranged inside each of inner columns and outer columns, and a quick plug communicated with the corresponding cooling liquid pipeline is mounted on each of the inner columns and the outer columns. Better cooling effect can be realized by utilizing the diversion groove, so that cooling effect is improved; by means of arranging cooling pipelines inside supporting columns, the cooling pipelines are contained in the supporting columns, so that no space is occupied, structure is simplified, and the objectives of compactness and high efficiency are achieved.

Description

technical field [0001] The invention relates to a machining tool, in particular to an improved milling fixture for an eccentric upper head flange. Background technique [0002] The eccentric upper head flange is a special flange in the pipeline circulation industry, as attached figure 1 As shown, it includes a circular sealing plate 101, an axis hole 102 is opened on the axis of the circular sealing plate 101, and an axis sleeve 103 is installed on the axis hole 102, and a Four through-holes 106 distributed symmetrically around the axis are used to pass through and fix the measurement signal terminals, and arc-shaped strip holes 104 are arranged around the sealing plate 101 for the installation of seals An irregular groove 105 is recessed and formed on the sealing plate 101 for installing the signal measuring block, and its shape matches it. [0003] At present, the processing technology of the eccentric upper head flange is as follows: firstly, the center hole is drilled ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an improved milling fixture for the eccentric upper head flange, which solves the problems of long clamping time, low efficiency, low yield and local accumulation of coolant in the current processing technology, and improves production. The purpose of improving efficiency and improving the qualified rate of finished products

The present invention is a core device proposed by the applicant based on a new process. The applicant found in many years of processing technology that the structure of the upper head flange is rather special, and the position of the groove on the end surface can be changed, but the groove The distance between a cylindrical blind hole at the end and the axis of the flange is fixed. In order to solve the problem of changing the milling machine many times in the existing processing technology, the applicant found after years of research that the blind hole at the end of the groove is the Datum, multiple positions can be processed at one time. First, a positioning plate is installed on the processing table of the milling machine through locking bolts. A set of arc-shaped side walls and eccentric positioning pins are arranged on the positioning plate. The side wall of the cylinder constitutes the outer circle of the cylinder, and the gap between the two arc-shaped side walls is formed. This gap plays an important role. After the sealing plate is put in, the sealing plate can be adjusted and rotated from the side of the gap. It is conducive to quick alignment and positioning. This outer circle is used as the installation reference of the processed sealing plate. When using it, firstly process the end face of the blank, and after processing a qualified end face, mill a groove on the other end face to process the processed One side of the groove is placed on the positioning plate downwards, and the sealing plate is rotated so that the positioning pin is inserted into the blind hole of the groove. At this time, the sealing plate no longer rotates. A tapered surface, the tapered surface acts as a guide for the insertion of the sealing plate, which is convenient for quickly placing the sealing plate, thereby increasing the speed of clamping. By setting a spacer on the positioning plate, the middle part of the spacer is cross-cut Finally, a diversion groove is formed, and the block can be a whole or a split type. The diversion groove connects the axis hole of the sealing plate with the gap between the two side walls. When washing to work, the cooling liquid flows through the processing area. Slipping away from the diversion groove avoids the phenomenon of partial accumulation of coolant at the bottom caused by overflowing from the top after the coolant is cooled in the prior art, and can perform better cooling and improve the cooling effect; the positioning is completed , using the solenoid valve as a switch to drive the cylinder, the cylinder drives the pressure head to act on the sealing plate, pressing the sealing plate downward, and the sealing plate is fixed under the cooperation of the side wall, the positioning pin, and the pressure head. The axial hole, four through holes, and strip holes are processed on one milling machine. During the processing, the sealing plate is only clamped once, which improves the processing efficiency, and the position is fixed, which is easy to clamp and reduce the difficulty of alignment. Avoid the inaccurate shape of the clamping, and at the same time, one reference is used as the processing reference of the side wall, four through holes, and strip holes, maintaining a high degree of uniformity, improving the qualified rate of finished products, and raising the qualified rate of finished products to 97% The above; by setting the cooling pipe inside the support column, the cooling pipe is stored in the support column, which does not occupy space and has no messy wiring. By setting the quick-connect plug on the support column, the external pipeline can be used. Coolant is used in the process of using coolant, and there is no cooling tube in the process of unnecessary coolant, which greatly reduces the space occupied by the cooling tube, simplifies the structure, and achieves the purpose of simplicity and efficiency

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