Large-size ring cooler frame multi-hole positioning machining method

Abstract

A kind of large-size ring cooling machine frame porous positioning processing method, comprising the following method steps: 1) processing arc spare frame: with side end surface as reference surface, first process the bolt hole of side section.2) make mould board: according to drawing, according to the bolt hole layout structure of single frame, take half upper plane bolt hole layout structure to manufacture outer arc mould board.3) determine the scribing positioning of single frame reference point: respectively determine the end reference point of upper plane of inner arc component and outer arc component;Then determine the reference point of middle part of upper plane of inner arc component and outer arc component using the distance between reference points.4) locate mould board on the plane of frame.5) according to the center point of bolt hole on mould board, determine the center point of pre-processed bolt hole of frame plane.6) drill and cut bolt hole.The present application can improve the scribing processing efficiency of ring cooling machine frame arc plane bolt hole positioning, improve the position accuracy of positioning hole, and can realize the technical requirements and installation accuracy requirements of workpiece.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing technology, and in particular to a method for machining multi-hole positioning of a large-size annular cooler frame. Background Technology

[0002] The annular cooler frame used in the blast furnace and plate steelmaking plant after blast furnace renovation (the frame is divided into 20 individual frames at 18-degree intervals). After the individual frames are manufactured and assembled, they are shipped to the site for commissioning and installation (the 20 frames are joined together using bolt holes on the side ends to form a circle with a diameter of 48440mm). The individual frame has a fan-shaped inner and outer annular structure, with crossbeams connecting the inner and outer parts (see...). Figure 2 The frame is constructed from five welded steel plates, both internally and externally (top and bottom, side end faces, and inner side faces). The manufacturing and assembly precision requirements are extremely high. The frame has a large number of positioning bolt holes on its upper surface, with a positional accuracy of 0.9° between two bolt holes and a center-to-center distance of R23950 for the outer arc frame. The positional accuracy of the installed guardrails and roller conveyors, as well as the positional accuracy of the positioning bolt holes for the guardrails and roller conveyors, is particularly crucial.

[0003] The traditional method of marking out bolt holes on the upper and lower planes of the frame before machining involves first locating the two closest bolt holes to the end face, then marking out the remaining holes sequentially at angles, repeatedly crossing lines. Due to the large dimensions of the frame (inner arc radius R19815mm, outer arc radius R24220mm), the marking error is very large, making it impossible to guarantee the positional accuracy between bolt holes. Furthermore, the large number of marking holes requires 3 to 4 people to complete the marking for one frame, resulting in a long construction period, failing to effectively guarantee the processing schedule, significantly reducing work efficiency, and increasing operation time. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-hole positioning machining method for a large-size ring cooler frame, which can improve the efficiency of scribing machining for positioning bolt holes on the arc plane of the ring cooler frame, improve the positional accuracy of the positioning holes, and meet the technical requirements and installation accuracy requirements of the workpiece.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A method for machining multi-hole positioning in a large-size annular cooler frame includes the following steps:

[0007] 1) Machining the arc-shaped spare parts frame: Based on the installation drawings, first machine the bolt holes on the side section using the side end face as the reference plane, then assemble and weld the inner and outer arc components, and connect the inner and outer arc components into a single frame by welding the crossbeam.

[0008] 2) Fabrication of the jig: According to the drawings, based on the bolt hole layout of the outer arc surface of the single frame, take half of the bolt hole layout of the upper plane of the outer arc to manufacture the outer arc jig; mark the platform to determine the center point of each bolt hole on the jig, and determine the end center point of the jig plane. This end center point is the intersection of the center arc between the bolt holes of the outer and inner circular railings and the end of the jig plane. Use the center points of the left and right ends as positioning reference points; use the same method to manufacture the inner arc jig and determine the reference point.

[0009] 3) Marking and positioning the reference points of the single frame: Draw a line connecting the center points of the longitudinal bolt holes on the side end face, and draw the perpendicular bisector of the line connecting the center points. Take the intersection of the perpendicular bisector and the upper plane as the reference point. Use the above method to determine the end reference points of the upper plane of the inner and outer arc components respectively; then use the distance between the reference points to determine the reference point of the middle part of the upper plane of the inner and outer arc components.

[0010] The distance between reference points refers to the distance between two reference points on the same arc surface and the distance between the reference point at the end of one arc surface and the reference point in the middle of another arc surface. Arcs are drawn on the upper plane of the inner and outer arc components with the reference points at the ends of the two arc surfaces as the center. The intersection of the arcs is the reference point in the middle of the upper plane.

[0011] 4) Position the tire plate on the plane of the frame by aligning the tire plate reference point with the plane reference point.

[0012] 5) Using a dotting tool, determine the center point of the bolt holes pre-machined on the frame plane according to the center point of the bolt holes on the jig.

[0013] 6) Drill the bolt holes using a magnetic drill according to the determined center point.

[0014] The thickness of the tire plate is 2-5mm.

[0015] After determining the bolt hole positions on half of the arc surface using the jig, rotate the jig 180° and align the reference points to determine and machine the bolt holes on the other half of the arc surface.

[0016] The radius of the inner arc component is 19815mm-24500mm.

[0017] The radius of the outer arc component is 24220mm-28900mm.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention can improve production efficiency, increase the processing accuracy of the ring cooler frame, reduce costs, reduce the intensity of human labor, avoid the need for highly skilled personnel to operate, and simultaneously meet the technical installation requirements of the workpiece. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the outer arc tire plate in this invention.

[0021] Figure 2 This is a schematic diagram of the structure of the single frame in this invention.

[0022] Figure 3 yes Figure 2 The P-direction view.

[0023] Figure 4 This is a schematic diagram of the inner arc tire plate in this invention.

[0024] In the diagram: 1-Reference point A', 2-Outer arc plate, 3-Bolt positioning hole, 4-Reference point A, 5-Center arc, 6-Reference point B, 7-Outer arc side end face, 8-Reference point C, 9-Inner arc side end face, 10-End face bolt hole, 11-Crossbeam, 12-Reference point B', 13-Reference point E, 14-Reference point C', 15-Outer arc upper plane, 16-Inner arc upper plane, 17-Reference point F, 18-Outer circle guardrail bolt hole, 19-Rail bolt hole, 20-Inner arc plate, 21-Rail bolt hole positioning hole, 22-Reference point D', 23-Reference point D, 24-Inner circle guardrail bolt hole. Detailed Implementation

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0026] Example:

[0027] The ring cooler frame is divided into 20 individual frames at 18° intervals. Each individual frame consists of an inner arc component, an outer arc component, and a crossbeam 11 connecting the inner and outer arc components (see...). Figure 2 The overall frame is fan-shaped. The inner and outer arc components are welded together from the upper plane, lower plane, two side end faces, and an arc-shaped bottom surface, respectively. The crossbeam 11 connects the arc-shaped bottom surfaces of the inner and outer arc components. The 20 individual frames are assembled together using the bolt holes 10 on the side end faces to form a circle with a diameter of 48440mm, of which the radius of the inner arc component is 19815mm and the radius of the outer arc component is 24220mm.

[0028] like Figures 1-3 As shown, the method for machining multi-hole positioning of a large-size annular cooler frame includes the following steps:

[0029] 1) Machining the arc-shaped spare parts frame: According to the design drawings, the center line of the longitudinal bolt hole 10 on the side end face coincides with the center arc line 5 between the bolt hole 18 on the outer circle of the upper plane and the bolt hole 24 on the inner circle of the upper plane (on the same arc surface). Therefore, the bolt hole 10 on the side section is machined first with the side end face as the reference surface. Then, the inner and outer arc components are assembled and welded. The inner and outer arc components are connected into a single frame by welding the crossbeam 11.

[0030] 2) Fabrication of the jig: According to the drawings, based on the bolt hole layout structure of the outer arc surface of the single frame, take half of the bolt hole layout structure of the upper plane 15 of the outer arc to manufacture the outer arc jig 2; mark the platform to determine the center point of each bolt hole on the jig 2 and determine the end center point of the jig 2 plane. This end center point is the intersection of the center arc 5 between the outer circular railing bolt hole 18 and the inner circular railing bolt hole 24 and the end of the jig 2 plane (the holes on the jig 2 that correspond to the outer circular railing bolt hole 18 and the inner circular railing bolt hole 24 are bolt positioning holes 3). Use the center points of the left and right ends as positioning reference points; use the same method to manufacture the inner arc jig 20 and determine the reference point.

[0031] A 3mm thick steel plate is selected to make the jig. The bolt holes can be precisely positioned using traditional methods such as platform scribing, and the bolt positioning holes 3 and track bolt hole positioning holes 21 on the jig are drilled using a CNC machine tool. One jig with an inner arc upper plane 16 and an outer arc upper plane 15, which match the bolt holes of the single frame, is produced.

[0032] On the outer arc tire plate 2, take the end center points as reference point A4 and reference point A'1 respectively (e.g. Figure 1 (As shown). The center points of the ends of the inner arc tire plate 20 are taken as reference point D23 and reference point D'22, respectively.

[0033] 3) Marking and positioning the reference points of the single frame: Draw a line connecting the center points of the longitudinal bolt holes on the side end face, and draw the perpendicular bisector of the line connecting the center points. Take the intersection of the perpendicular bisector and the upper plane as the reference point. Use the above method to determine the end reference points of the upper plane of the inner and outer arc components respectively; then use the distance between the reference points to determine the reference point of the middle part of the upper plane of the inner and outer arc components.

[0034] The distance between reference points refers to the distance between two reference points on the same arc surface and the distance between the reference point at the end of one arc surface and the reference point in the middle of another arc surface. Arcs are drawn on the upper plane of the inner and outer arc components with the reference points at the ends of the two arc surfaces as the center. The intersection of the arcs is the reference point in the middle of the upper plane.

[0035] See Figure 2 , Figure 3First, determine the end reference point B6 of the outer arc upper plane 15: Take the center point of the two bolt holes 10 on the outer arc side end face 7 as the reference point, draw a semicircle with the distance between the two holes as the diameter, and draw the center line intersecting the end face (the intersection with the outer arc upper plane 15), thus determining the reference point B6. Use the same method to determine the reference point C8 of the inner arc side end face 9 (i.e., the end reference point C8 of the inner arc upper plane 16). Use the same method to make the reference point B'12 at the other end of the outer arc upper plane 15 and the reference point C'14 at the other end of the inner arc upper plane 16.

[0036] Then, using reference points B6, C8, and lengths L1, L2, L3, and L4, quasi-reference points E13 and F17 are constructed on the upper plane of the single frame. L1, L2, L3, and L4 can be obtained through calculation or simulation using CAD software.

[0037] 4) Position the tire plate on the plane of the single frame, ensuring that the tire plate reference point coincides with the plane reference point.

[0038] Place the tire plate on the upper plane of the single frame, wherein the reference point A4 of the outer arc tire plate 5 coincides with the reference point B6, the reference point A'1 coincides with the reference point E13, the reference point D23 of the inner arc tire plate 20 coincides with the reference point C8, and the reference point D'22 coincides with the reference point F17.

[0039] 5) Using a dotting tool, determine the center points of the bolt holes pre-machined on the frame plane according to the center points of the bolt holes on the jig. Use a special dotting tool to locate the center points of each bolt hole on the upper plane of the single frame, corresponding to the positions of the bolt holes on the inner arc jig 20 and the outer arc jig 2.

[0040] 6) After determining the bolt hole positions on the half-arc surface using the jig, rotate the jig 180° and use the method in step 4) above to align and position the reference points, then determine and machine the bolt holes on the other half-arc surface.

[0041] 7) Remove the jig plate and drill the bolt holes using a magnetic drill according to the determined center point.

Claims

1. A large-sized ring cooler frame multi-hole positioning machining method, characterized in that, The method comprises the following steps: 1) processing the arc-shaped spare frame: install the drawing, and process the bolt holes of the side section as the reference surface, then combine and weld the inner and outer arc components, and connect the inner and outer arc components into a single frame through the welding of the cross beam; 2) manufacturing the template plate: according to the drawing, the layout structure of the bolt holes on the outer arc surface of the single frame, take one-half of the outer arc upper plane bolt hole layout structure to manufacture the outer arc template plate; platform scribe, determine the center points of the bolt holes on the template plate, and determine the end center points of the template plate plane, the end center points are the intersection points of the center arc between the outer circular fence bolt hole and the inner circular fence bolt hole and the end of the template plate plane, and the center points of the left and right ends are taken as the positioning reference points; the inner arc template plate is manufactured by the same method, and the reference points are determined; 3) scribe positioning of the reference points of the single frame: draw a line through the center points of the longitudinal bolt holes of the side end surface, and draw the median line of the center points, and the intersection point of the median line and the upper plane is taken as the reference point, and the end reference points of the upper planes of the inner and outer arc components are determined by the above method; the reference points of the middle positions of the upper planes of the inner and outer arc components are determined by the distance between the reference points; 4) according to the coincidence of the template plate reference points and the plane reference points, the template plate is positioned on the plane of the frame; 5) using the dotting tool, the center points of the pre-processed bolt holes of the frame plane are determined according to the center points of the bolt holes on the template plate; 6) according to the determined center points, the bolt holes are processed; The distance between the reference points in the above step 3) refers to the distance between the two reference points on the same arc surface and the distance between the end reference point of the arc surface and the middle reference point of the other arc surface, and the circular arcs are drawn on the upper planes of the inner and outer arc components with the two arc surface end reference points as the centers, and the intersection points of the circular arcs are the reference points of the middle positions of the upper planes; The radius of the inner arc component of the frame is 19815mm-24500mm; The radius of the outer arc component of the frame is 24220mm-28900mm.

2. The method of claim 1, wherein, The thickness of the template plate is 2-5mm.

3. The method of claim 1, wherein the method is characterized by, After the bolt hole positions on one-half of the arc surface are determined by the template plate, the template plate is turned over by 180°, the reference points are repositioned, and the bolt holes on the other one-half of the arc surface are determined and processed.

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