Spiral supporting plate straight hole machining method

Abstract

The invention relates to a spiral supporting plate straight hole machining method which is completed through cooperation of a three-dimensional inspection sample box, a hole center positioning method, a hole site lineation technology, a detection tool, a jack supporting cushion technology, a drilling technology and the like, and the three-dimensional inspection sample box is used for inspecting the profile tolerance of a spiral supporting plate and scribing an inner circle net material line and an outer circle net material line; a two-dimensional drawing is projected into a three-dimensional model through the projection principle in three-dimensional software, the distance between the inner circle of the supporting plate and the circle line where the hole center is located and the distance between a starting point and all hole sites are obtained through measurement, then hole site lineation is conducted on the spiral supporting plate, and drilling is conducted on a drilling machine by aligning the position through the jack supporting cushion technology. The purposes of hole center positioning and straight hole drilling perpendicular to the spiral surface of the spiral supporting plate are achieved; the whole machining method does not depend on a large numerical control drilling and milling machine, machining difficulty and machining cost are reduced, positioning precision is high, machining efficiency is high, and wide application and popularization value is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the vertical stirring mill screw apron processing technical field, specifically relates to a kind of straight hole processing method of screw apron. BACKGROUND

[0002] Vertical stirring mill is also called tower mill, mainly by driving device, cylinder, transmission shaft, screw stirrer and other components, can be ground to micron level material particle size;Screw stirrer rotates in cylinder, is the main area of grinding, and is the core component of vertical stirring mill, mainly composed of center shaft 15, screw apron 1, screw lining, screw lining is installed on screw apron 1 by bolt, screw apron 1 as the main part of bearing screw lining, material selects high-strength structural steel plate, is manufactured by multiple petals, multiple screw apron 1 is welded on center shaft as double helix, as shown in Figure 1 .

[0003] As shown in Figure 2 , screw apron 1 is distributed with a certain number of straight holes 3 perpendicular to helical surface, for installing bolt, fastening screw lining, the hole center of multiple straight holes 3 is located on the same circle;Straight hole 3 on screw apron 1 is processed after the pressing type of apron, requires perpendicular to helical surface, because the shape of screw apron 1 is irregular, hole position is not easy to position, straight hole 3 is difficult to process, if not good, hole position deviation or hole edge perpendicularity deviation will cause screw lining assembly, bolt can not be closed problem;Therefore, hole center positioning accuracy and perpendicular to helical surface straight hole processing is crucial to screw stirrer assembly.

[0004] In prior art, large-scale numerical control gantry boring and milling machine is usually used to align hole position, and then straight hole is drilled by numerical control programming, this processing method occupies large-scale numerical control gantry boring and milling machine, and the cost is higher. SUMMARY

[0005] In view of the problems in prior art, the present application provides a kind of straight hole processing method of screw apron, which does not rely on large-scale numerical control gantry boring and milling machine, and can realize the positioning and processing of straight hole perpendicular to helical surface of screw apron, save large-scale machine tool resources, and reduce cost.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: A straight hole processing method of screw apron, the screw apron is formed with a center shaft as a guide line, the screw apron is provided with a plurality of straight holes with hole centers located on the same circle, the straight hole axis is perpendicular to the working surface of the screw apron, and the processing method comprises the following steps: The three-dimensional inspection sample box is composed of an inner circular steel plate, an outer circular steel plate and connecting steel plates of different heights. The inner circular steel plate and the outer circular steel plate are concentrically arranged, and a plurality of connecting steel plates of different heights are arranged between the inner circular steel plate and the outer circular steel plate to form a spiral surface. The inner circular radius of the sample box is equal to the outer circular radius of the central shaft, and the outer circular radius of the sample box is equal to the outer circular radius of the spiral support plate. The top surface of the sample box matches the working surface of the spiral support plate. After the spiral support plate is pressed, the working surface of the spiral support plate is attached to the top surface of the sample box to check whether the spiral support plate is qualified. If the sample box is qualified, the inner circular steel plate and the outer circular steel plate of the sample box are used to draw the net material line of the inner circle and the outer circle of the spiral support plate. If the sample box is not qualified, the spiral support plate is re-pressed until it is qualified. Hole position marking: the two-dimensional drawing is projected onto the spiral surface of the three-dimensional model of the spiral support plate by using the three-dimensional design software. The distance Y between the circle line of the hole center and the inner circle of the spiral support plate is measured. The intersection point of the circle line of the hole center and the net material line at the lower end of the spiral support plate is taken as the starting point. The distance X1 between the starting point and the first hole center, the distance X2 between the first hole center and the second hole center, and the distance Xn-1 between the n-1th hole center and the nth hole center are measured. n Then, the inner circle is taken as the reference to draw the circle line of the hole center on the spiral support plate which is qualified. The starting point is taken as the center to draw the circle line of the hole center according to X1, X2...Xn-1. 1， X2...X n Each hole center is planned by using a card. After the hole center spacing deviation meets the requirements, the sample hole is punched, the hole circle line is drawn, and the circle line is checked. Drilling: the spiral support plate is supported by using the jack pad method to make the plane of the hole to be machined horizontal. After the plane is calibrated by using the bubble level, the spiral support plate is fixed. The hole position flatness is detected and drilled step by step. After a straight hole is machined, the process of the jack pad and drilling is repeated until all the straight holes are machined.

[0007] Further, the sample box is made of 1-2 mm thick steel plate. The top surface matches the working surface of the spiral support plate, and the deviation is less than or equal to 1 mm.

[0008] Further, the height of the connecting steel plate changes according to the gradient of the depth of the spiral surface. The included angle between adjacent connecting steel plates is less than 10°.

[0009] Further, in order to ensure the strength of the sample box, a rib plate is arranged between adjacent connecting steel plates, and a reinforcing plate is arranged on the top surface of each connecting steel plate.

[0010] Further, the specific method of attaching the working surface of the spiral support plate to the top surface of the sample box is as follows: the spiral support plate is placed on the ground. The sample box is lifted by using the crown block so that the top surface of the sample box is attached to the working surface of the spiral support plate. If the top surface of the sample box completely matches the working surface of the spiral support plate, the spiral support plate is qualified.

[0011] Furthermore, after marking the hole center positions on the spiral support plate, the hole spacing needs to be measured again and compared with the theoretical dimensions to ensure that the deviation between the hole center spacing and the theoretical dimensions does not exceed 1.5mm.

[0012] Furthermore, the spiral support plate is supported by jacks so that the plane containing each straight hole of the spiral support plate is parallel to the ground. A bubble level is used to check whether the hole position is horizontal. After leveling, bolts are used to fix and tighten it.

[0013] Furthermore, before drilling, use a drill bit to check the flatness of the spiral support plate hole. A crosshair is marked on the hole. Use an 8mm drill bit to check the crosshair. The feed dial error must be ≤0.5mm.

[0014] Furthermore, when drilling, it is advisable to drill in multiple steps. After drilling, use a vernier caliper to check the distance between the back and front holes, with a tolerance of 2mm.

[0015] Furthermore, after each hole is machined, the perpendicularity between its cylindrical surface and the helical surface must be verified.

[0016] Beneficial effects: This invention designs a method for machining straight holes in a spiral support plate, which is accomplished through the combined use of inspection fixtures, support fixtures, hole center positioning methods, and hole marking techniques. Specifically, a three-dimensional inspection template is used to assist in inspecting the working surface of the spiral support plate and to serve as a reference for marking the inner and outer circles. Three-dimensional design software is used to convert the dimensions on the two-dimensional drawings to a three-dimensional model of the part. By measuring key dimensions on the three-dimensional model, the hole center position is located. The hole position is then accurately located on the spiral support plate based on these key dimensions, and measurements are used to ensure the hole position deviation is correct. This method eliminates the need for large CNC gantry milling machines, and the hole marking method is simple. This method is easy to implement. After aligning the hole, the spiral surface where the hole is located is ensured to be horizontal by using a combination of jack support and level. This ensures the perpendicularity of the hole edge to the spiral surface. This method can completely realize the positioning and processing of straight holes on the vertical spiral support plate, effectively solving the processing problems of easy deviation in the position of straight holes and the perpendicularity of the hole edge in the spiral support plate of the vertical stirring mill spiral agitator. The method is simple and easy to implement, with low processing cost. It has reference value for processing situations where the hole is perpendicular to the curved surface, the hole center position is required, and the hole edge perpendicularity is required. It has wide application and promotion value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a spiral stirrer. Figure 2 This is a schematic diagram of a spiral support plate structure; Figure 3 This is a schematic diagram of the three-dimensional inspection sample box structure; Figure 4A schematic diagram showing the inspection of the working surface of the spiral pallet using a three-dimensional inspection sample box; Figure 5 A schematic diagram showing the clean material line drawn for the spiral pallet; Figure 6 This is a schematic diagram of distance measurement by projection in 3D design software. Figure 7 A schematic diagram showing the use of jacks to support the drilling of the spiral support plate.

[0018] Attached reference numerals: 1 Spiral support plate, 2 Support plate working surface, 3 Straight hole, 4 Sample box, 5 Inner circular steel plate, 6 Outer circular steel plate, 7 Connecting steel plate, 8 Rib plate, 9 Reinforcing plate, 10 Three-dimensional inspection and measurement point, 11 Inner circular net material line, 12 Outer circular net material line, 13 Circle line where the hole center is located, 14 Jack, 15 Central shaft. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] To address the machining deviations in the position and perpendicularity of the straight holes in the spiral support plate of a vertical stirring mill, this invention provides a method for machining straight holes in the spiral support plate. This method utilizes a three-dimensional inspection box, a spiral support plate hole center positioning method and hole marking technology, a bubble level testing tool, and a machining technique that uses a jack on a drilling machine to drill holes perpendicular to the spiral surface. This method achieves the goal of center positioning and drilling straight holes perpendicular to the spiral surface of the spiral support plate. The specific method is as follows.

[0021] 1. Fabrication of 3D inspection sample box 4.

[0022] like Figure 3 As shown, the three-dimensional inspection sample box 4, hereinafter referred to as sample box 4, is made of 1-2mm thick steel plate according to the maximum solid size of the spiral support plate 1. It is mainly composed of inner circular steel plate 5, outer circular steel plate 6, connecting steel plates 7 of different heights, stiffening plates 8, and reinforcing plates 9. The inner circular steel plate 5 and outer circular steel plate 6 are arranged concentrically, and multiple connecting steel plates 7 of different heights are distributed between them according to the spiral surface height. The inner circle radius of sample box 4 is equal to the outer circle radius of the central axis 15, and the outer circle radius of sample box 4 is equal to the outer circle radius of the spiral support plate 1. The included angle between each connecting steel plate 7 inside the sample box 4 is <10°; stiffening plates 8 are set between adjacent connecting steel plates 7, and reinforcing plates 9 are welded to the upper edge of the connecting steel plates 7 to increase strength and prevent deformation of the sample box 4; the top surface of the sample box 4 matches the working surface 2 of the support plate (i.e., the upper surface of the spiral support plate 1). In order to improve the fit rate between the sample box 4 and the working surface 2 of the support plate and reduce the incorrect position of the spiral support plate 1 caused by the inaccuracy of the sample box 4, which would ultimately affect the positioning of the straight hole 3, multiple three-dimensional inspection and measurement points 10 are set on the sample box 4 after its fabrication (e.g., ...). Figure 3 (As shown by the black dots in the middle), a three-dimensional inspection is used to ensure that the deviation of the working surface (top surface) of sample box 4 is ≤1mm.

[0023] 2. Check the outline of the spiral pallet and mark the material line.

[0024] After the spiral pallet 1 is formed, the profile of the working surface 2 of the pallet is checked using the template box 4. Figure 4 As shown, the specific method is as follows: The spiral pallet 1 is placed on the ground with its working surface 2 facing upwards. A crane lifts the sample box 4 so that its top surface faces downwards and fits against the working surface 2 of the pallet. If the sample box 4 is completely fitted against the working surface 2 of the pallet, the spiral pallet 1 is considered to have passed the forming test. At this point, the inner circular steel plate 5 and the outer circular steel plate 6 of the sample box 4 are used to mark the inner circular material line 11 and the outer circular material line 12 of the spiral pallet 1. Figure 5 As shown; if the inspection fails, return to the press to re-form until it passes the test.

[0025] III. Hole center positioning method and hole marking technique for spiral support plate.

[0026] In 3D design software, create a 3D model of the spiral pallet 1, and project the 2D drawing onto the pallet working surface 2 of the 3D model of the spiral pallet 1, such as... Figure 6 As shown, the distance Y between the circle line 13 containing the center hole and the inner circle of the spiral support plate 1 is measured using the measurement function in the 3D design software; taking the intersection of the circle line 13 containing the center hole and the net material line at the lower end of the spiral support plate 1 as the starting point, the distance X1 between the starting point and the first center hole, the distance X2 between the first center hole and the second center hole, and the distance X1 between the (n-1)th center hole and the nth center hole are measured. n .

[0027] Then, marking is performed on the qualified spiral support plate 1. When marking, the inner circle net material line 11 of the spiral support plate 1 is used as a reference. Based on the distance Y between the circle line 13 containing the hole center and the inner circle of the spiral support plate 1, measured by the 3D design software, the circle line 13 containing the hole center is marked on the spiral support plate 1. Then, with the starting point as the center, based on the measured X1, X2...X... n On the circle line 13 where the hole center is located, use a card to mark each hole center; after the hole center is marked, measure the hole spacing again and compare it with the theoretical size, and control the hole center spacing to deviate from the theoretical size by no more than 1.5mm. Then, punch the hole, mark the hole circle line and inspection line.

[0028] 4. Drill holes on a drilling machine.

[0029] After the center and circle of the hole are determined, drill the hole on the drilling machine; for example... Figure 7 As shown, the spiral support plate 1 is supported by jacks 14. Multiple jacks 14 are placed under the spiral support plate 1 and supported at different heights so that the plane of the straight hole 3 to be processed on the spiral support plate 1 is parallel to the ground. A portable disc bubble level is used to check whether the hole surface is level. After leveling, bolts are used to fix and tighten it. The position of the spiral support plate 1 is fixed by the cooperation of bolts and pressure plates.

[0030] Use the drill bit to check the flatness of the hole site of the spiral pallet 1, draw a cross on the hole, use an 8mm drill bit to detect 4 points in the cross direction, and observe the error on the scale of the feed dial on the drilling machine within 0.5mm; the selection of the drill bit during drilling should not be conspicuous, and it is appropriate to drill in multiple steps; after drilling the hole, use a vernier caliper to detect the distance between the back and the front hole, with a tolerance of 2mm; then check whether the cylindrical surface of the hole wall is perpendicular to the spiral surface of the hole center; after the inspection is qualified, adjust the jack 14 to make the plane of the second hole site parallel to the ground, repeat the above process, and complete the drilling of all straight holes 3.

[0031] The spiral pallet straight hole processing method comprises a three-dimensional inspection sample box 4, a hole center positioning method of the spiral pallet 1, a hole site scribing technology, a bubble level detection tool, a jack supporting technology and a drilling machine drilling technology, etc. The method is to make a three-dimensional inspection sample box 4 according to the maximum solid size of the contour of the spiral pallet 1, which is used to check the contour and the inner circle and outer circle neat material lines 11 and 12 of the spiral pallet 1; the two-dimensional drawing is projected into the three-dimensional model by using the projection principle in the three-dimensional software, the distance Y between the pallet inner circle and the circle line 13 of the hole center, the distance X1 between the starting point and the first hole center, the distance X2 between the first hole center and the second hole center, and the distance Xn-1 between the n-1th hole center and the nth hole center are measured in the software. n According to the measured distances, the hole center circle center is scribed on the pallet working surface 2, the position of each hole center is determined by using a caliper, then the plane of the hole center is leveled to the ground by using a plurality of jacks 14, the bubble level tool is used to detect whether the plane of the hole is horizontal, the straight hole 3 is drilled by using a radial drilling machine after being fixed by using a bolt pressing block, the processing problems that the hole site of the spiral pallet straight hole is easy to deviate and the perpendicularity of the hole edge is also easy to deviate are effectively solved, the processing difficulty is reduced, and the cost of the machine tool is greatly reduced. The method is simple to implement, has high positioning accuracy and high processing efficiency, is also suitable for processing occasions that the hole in the part is perpendicular to the curved surface, the hole center position is required to be high, and the perpendicularity of the hole edge is required to be strict, and has wide application and promotion value.

[0032] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application, and any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution range of the present application to obtain equivalent embodiments with equivalent changes, but as long as it does not depart from the technical solution content of the present application, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A method for machining straight holes in a spiral support plate, wherein the spiral support plate is formed with a central axis as the guide, and the spiral support plate has multiple straight holes whose centers are located on the same pitch circle, the axis of the straight holes being perpendicular to the working surface of the spiral support plate, characterized in that... The processing method includes the following steps: Fabrication of a 3D inspection template box: The 3D inspection template box, or template box for short, is mainly composed of an inner circular steel plate, an outer circular steel plate, and connecting steel plates of different heights welded together. The inner and outer circular steel plates are arranged concentrically, and multiple connecting steel plates of different heights are distributed between them to form a spiral surface. The inner circle radius of the template box is equal to the outer circle radius of the central axis, and the outer circle radius of the template box is equal to the outer circle radius of the spiral support plate. The top surface of the template box matches the working surface of the spiral support plate. Spiral pallet contour inspection and marking of clean material lines: After the spiral pallet is formed, the working surface of the spiral pallet is attached to the top surface of the sample box to check whether the spiral pallet is pressed into a qualified state. If the inspection is qualified, the clean material lines of the inner and outer circles of the spiral pallet are marked using the inner and outer circular steel plates of the sample box. If the inspection is not qualified, the spiral pallet is re-formed until it is qualified. Hole marking: Using 3D design software, project the 2D drawing onto the spiral surface of the 3D model of the spiral pallet. Measure the distance Y between the circle containing the hole center and the inner circle of the spiral pallet. Taking the intersection of the circle containing the hole center and the net material line at the bottom of the spiral pallet as the starting point, measure the distance X1 between the starting point and the first hole center, the distance X2 between the first hole center and the second hole center, ..., the distance X between the (n-1)th hole center and the nth hole center. n Then, on the pressed and qualified spiral support plate, using the inner circle as a reference, draw the indexing circle line where the hole center is located according to Y; using the starting point as the center, draw the indexing circle line according to X. 1， X2...X n Using a card, each hole center is marked out. After the hole center spacing deviation meets the requirements, a sample is punched, and hole circles are drawn and inspected. Drilling: The spiral support plate is supported by a jack to make the plane of the hole to be processed horizontal. After being calibrated by a bubble level, it is fixed. The flatness of the hole position is checked and drilling is carried out in steps. After processing one straight hole, the jack support and drilling process is repeated until all straight holes are processed.

2. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, The sample box is made of 1-2mm thick steel plate, with the top surface fitting against the working surface of the spiral support plate, with a deviation of ≤1mm.

3. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, The height of the connecting steel plates varies according to the gradient of the concave depth of the spiral surface, and the included angle between adjacent connecting steel plates is less than 10°.

4. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, To ensure the strength of the sample box, stiffening plates are installed between adjacent connecting steel plates, and a reinforcing plate is installed on the top surface of each connecting steel plate.

5. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, The specific method for bonding the working surface of the spiral pallet to the top surface of the sample box is as follows: Place the spiral pallet on the ground, and use an overhead crane to lift the sample box so that its top surface faces down and is bonded to the working surface of the spiral pallet. If the top surface of the sample box is completely bonded to the working surface of the spiral pallet, then the spiral pallet is qualified for forming.

6. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, After marking the hole center positions on the spiral support plate, the hole spacing needs to be measured again and compared with the theoretical dimensions. The deviation between the hole center spacing and the theoretical dimensions should not exceed 1.5mm.

7. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, The spiral support plate is supported by jacks, ensuring that the plane containing each straight hole of the spiral support plate is parallel to the ground. A bubble level is used to check whether the holes are level. After leveling, bolts are used to tighten the support plate.

8. The method for machining straight holes in a spiral support plate according to claim 1, characterized in that, Before drilling, use a drill bit to check the flatness of the spiral support plate hole. There are cross lines on the hole. Use an 8mm drill bit to check the cross lines. The feed dial error must be ≤0.5mm.

9. A method for machining straight holes in a spiral support plate according to claim 1, characterized in that, When drilling, it is advisable to drill in multiple steps. After drilling, use a vernier caliper to check the distance between the back and front holes, with a tolerance of 2mm.

10. A method for machining straight holes in a spiral support plate according to claim 1, characterized in that, After each hole is machined, the perpendicularity between its cylindrical surface and the helical surface must be verified.

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