CN111889978A - Manufacturing method of spiral supporting plate of large vertical mill - Google Patents
Manufacturing method of spiral supporting plate of large vertical mill Download PDFInfo
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- CN111889978A CN111889978A CN202010766511.XA CN202010766511A CN111889978A CN 111889978 A CN111889978 A CN 111889978A CN 202010766511 A CN202010766511 A CN 202010766511A CN 111889978 A CN111889978 A CN 111889978A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention relates to a method for manufacturing a spiral supporting plate of a large vertical mill, which can effectively solve the problems of inconvenient operation and incapability of ensuring the process parameters of a spiral stirrer in the prior art and solves the technical scheme that a computer simulates the flow field state of a spiral blade in two dimensions and three dimensions to obtain operation parameters, integrates test data and theoretical calculation results, optimizes the blade shape and the blanking size of a blade carriage, lays out and expands to obtain a preliminary blanking drawing, simulates and reversely pushes out a 3D mould drawing and a sample box drawing, utilizes the mould to carry out cold press molding after manufacturing a matched mould, leaves reasonable deformation compensation after blanking the supporting plate, further perfects the blanking drawing of the spiral supporting plate, deeply develops and independently an advanced manufacturing process route, determines a reasonable production process sequence, reduces welding deformation, improves the production efficiency and strictly controls the quality, the method achieves high precision standard, improves the first-time qualification rate of products, and is an innovation on the preparation method of the spiral supporting plate.
Description
Technical Field
The invention relates to a method for manufacturing a spiral supporting plate of a large vertical mill.
Background
The spiral stirrer is a core component of the vertical mill and is positioned in the cylinder body. When the spiral stirrer works, the steel balls and the ores enter the cylinder body, the steel balls are equivalent to media, ordered motion circulation is formed between the steel balls and the ores under the comprehensive action of centrifugal force, gravity and friction force, and the ores are crushed through extrusion, grinding and peeling and the like, so the design parameters (spiral outer diameter, spiral lead and spiral head number) and the wear-resistant parameters of the spiral stirrer are key parameters influencing the performance of the whole mill. The prior internal helical blades are formed by casting wear-resistant alloy and then are directly welded on the main shaft, and need to be integrally replaced or cost a large amount of cost to repair after being worn, in recent years, mill manufacturers in various countries in the world research and develop split helical stirrer structures, so that the helical blades can be conveniently mounted and dismounted, the helical stirring blades with interchangeability can be replaced, and the split helical stirrer structures are easy to operate and can also ensure the technological parameters of the helical stirrer. Therefore, the invention discloses a manufacturing method of a spiral supporting plate of a large vertical mill.
Disclosure of Invention
In view of the above situation, the present invention provides a method for manufacturing a spiral supporting plate of a large vertical mill, which can effectively solve the problems of inconvenient operation and incapability of ensuring the technological parameters of a spiral stirrer in the prior art.
The present invention relates to a vertical spiral mill with extensive industrial application, it is a fine mill equipment with vertically-mounted stirring device, mainly is formed from two portions, one is a grinding cylinder filled with grinding medium, another is its core component, and is a rotary stirrer, as shown in figure 1, the spiral blade is key portion of rotary stirrer, it has important influence on yield and quality of mill and economic index of grinding ore, the spiral supporting plate and spiral blade are connected together by means of bolt, its spiral lead angle must be identical with that of spiral blade, and can ensure that they can be combined together, so that the invented technical scheme is characterized by that it utilizes computer to two-dimensionally and three-dimensionally simulate flow field state of spiral blade to obtain operation parameter, and utilizes comprehensive test data and theoretical calculation result to optimize blade form and blade carriage blanking size, and can obtain preliminary blanking diagram, and simulating and reversely pushing out the 3D mould picture and the sample box picture, performing cold press molding by using a mould after manufacturing a matched mould, reserving reasonable deformation compensation after the supporting plate is blanked, and further perfecting the blanking picture of the spiral supporting plate.
The invention goes deep into practice and independently develops and sets an advanced manufacturing process route, determines a reasonable production process sequence, reduces welding deformation, improves production efficiency, strictly controls quality, reaches high-precision standard, improves the one-time qualification rate of products, and is an innovation on the preparation method of the spiral supporting plate.
Drawings
FIG. 1 is a structural view of a vertical type screw mill of the present invention.
FIG. 2 is a spiral supporting plate blanking drawing (a spiral supporting plate physical model is simulated by CAD lofting deepening 1:1, and a two-dimensional lofting blanking drawing is developed and pushed out).
FIG. 3 is a cold press forming drawing of the spiral pallet of the present invention.
FIG. 4 is a diagram of the simulated positioning of the spiral pallet of the present invention.
Fig. 5 is a schematic view of the drilling tool of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the present invention specifically comprises the following steps:
1) discharging
According to the simulation situation of a computer, lofting the spiral supporting plate by combining the allowance required by processing, reserving allowances at two ends of a net material line 1 of the spiral supporting plate to the position of a compensation line 4, ensuring that the corners of the spiral supporting plate are in a complete spiral shape, carrying out mutual detection on sample plate sizes by constructors, checking the thickness and the size of each blanked sample plate one by one, carrying out 100% ultrasonic flaw detection, arranging two lines of a walking pattern compensation line 2 and a theoretical sample line 3 on the inner arc edge, wherein the theoretical sample line 3 is a theoretical curve obtained by unfolding a physical model, in the actual processing, bending deformation exists, which can cause the contraction of the inner arc edge and the extension of the outer arc edge, according to the processing experience, deformation compensation is required to be set aside, the FAST CAM layout software is adopted to arrange the layout according to the layout of the deformed compensation lines 4 and 2, then copying a blanking program into a numerical control cutting machine, and machining an inner spiral groove according to the technical requirements of the drawing after cutting;
2) press forming
Determining the spiral lifting angle of a special pressing mould according to the overall dimension and rebound quantity of each spiral supporting plate, wherein each set of mould comprises an upper mould seat and a lower mould seat, the lower mould seat is fixed on a working platform of a hydraulic press, the upper mould seat is fixed with a hydraulic rod together, a supporting plate flat plate after blanking is placed on the mould, and the spiral supporting plate is pressed for a plurality of times by pressing for a certain time, stress is released, and the spiral supporting plate is pressed (as shown in figure 3);
3) examination of
Placing a special detection mould on the spiral supporting plate which is just pressed, and if the spiral surface of the spiral supporting plate and the spiral surface of the detection mould are completely superposed, returning the spiral supporting plate and the spiral surface of the detection mould to the press again for pressing till the spiral surface and the detection spiral surface are completely attached;
4) simulated installation positioning processing groove
After a spiral supporting plate and a fixed stirring shaft are installed in a simulated mode, a positioning device is manufactured to position and align the spiral supporting plate, the spiral supporting plate is fixed, a site installation position is simulated (as shown in figure 4), the accurate side line position and the accurate positioning hole position of the spiral supporting plate are determined on the horizontal steel plate surface of the upper spiral surface (and the installation contact surface of a spiral blade) of the spiral supporting plate according to the projection principle, marked lines are used for carving, after the simulated stirring shaft is removed, a compensation edge is removed according to the position of the accurate side line shown by the simulated time mark line, and a groove is machined;
5) positioning drill hole
Although the accurate positioning hole is found, an auxiliary drilling tool is needed for drilling on the spiral surface of the spiral supporting plate to position the workpiece, the drilling tool is divided into two parts, one part is a bracket pin shaft 6 connected with the spiral supporting plate, the bracket pin shaft 6 is spot-welded at the drilling position of the spiral supporting plate 5, the center of the bracket pin shaft 6 is superposed with the drilling center, each hole of the spiral supporting plate needs one bracket pin shaft 6, the other part of the tool respectively penetrates through a base 8 and a shaft sleeve 7 through bolts 10 to be fixed on a drilling machine base 9, the inner diameter of the shaft sleeve 7 is matched with the outer diameter of the bracket pin shaft 6, the bracket pin shaft 6 is inserted into a lower shaft sleeve 7 during drilling, each hole drilled in the spiral supporting plate 5 is guaranteed to be perpendicular to the normal line of the spiral surface of the supporting plate 5, the hole diameter is measured after drilling is finished, the tool is disassembled after the drilling is in accordance.
In order to guarantee the result of use, the drilling frock include drilling machine base 9, base 8, axle sleeve 7 and bracket round pin axle 6, be equipped with base 8 on the drilling machine base 9, be equipped with axle sleeve 7 on the base 8, the bracket round pin axle 6 is equipped with in the interpolation of axle sleeve 7, base 8, drilling machine base 9 pass through bolt 10 and fix together.
The bracket pin shaft 6 is in a circular tubular shape with a large upper outer diameter and a small lower outer diameter, and the lower part with the small outer diameter is clamped in the shaft sleeve 7.
The vertical section of the drilling machine base 1 is inverted concave.
The invention has the use condition that the forming technology is a crucial process in the production and manufacturing process of the spiral supporting plate, which has an important influence on the product quality of the large vertical stirring mill. The special manufacturing mould of the manufacturing process realizes the large-scale and universal manufacturing of the spiral supporting plate; the professional detection mould ensures that the spiral lead meets the design requirement; the simulation installation positioning supporting plate device ensures the overall dimension and the welding groove processing position of the supporting plate, and finally, the accurate positioning drilling position on the supporting plate ensures that the combined surface of the spiral supporting plate and the spiral blade after installation is completely attached.
The supporting plate manufactured by the manufacturing process can completely meet the use requirements of the existing domestic large-scale vertical stirring mill spiral supporting plate, greatly reduces the working strength of workers, has good effect, is suitable for batch production, creates good social benefit and economic benefit, has stronger competitiveness in the market, improves the production efficiency compared with the prior manufacturing, improves the interchangeability of products, reduces the production cost of equipment, is an innovation on the supporting plate manufacturing method, and has good economic benefit and social benefit.
Claims (4)
1. A manufacturing method of a spiral supporting plate of a large vertical mill is characterized by comprising the following steps:
1) discharging
According to the computer simulation situation, lofting is carried out on a spiral supporting plate by combining allowance required by machining, allowance is reserved at two ends of a spiral supporting plate material cleaning line (1) to the position of a compensation line (4), the compensation angle is (B-A) DEG, the corners of the spiral supporting plate are ensured to be in a complete spiral shape, constructors need to carry out sample plate size mutual inspection, the thickness and the size of each blanked sample plate are inspected one by one, 100% ultrasonic flaw detection is carried out, two lines of a walking pattern compensation line (2) and a theoretical sample line (3) are arranged on an inner arc edge, the theoretical sample line (3) is a theoretical curve obtained by unfolding a physical model, bending deformation exists in actual machining, the inner arc edge is contracted, the outer arc edge is extended, deformation compensation must be reserved according to machining experience, during material layout by adopting FAST CAM layout software, the walking pattern compensation line (4) and the compensation line (2) are taken as the reference, and then a blanking program is copied into a numerical control cutting machine, machining an inner spiral groove according to the technical requirements of the drawing after cutting;
2) press forming
Determining the spiral lifting angle of a special pressing mould according to the overall dimension and rebound quantity of each spiral supporting plate, wherein each set of mould comprises an upper mould seat and a lower mould seat, the lower mould seat is fixed on a working platform of a hydraulic press, the upper mould seat is fixed with a hydraulic rod together, a supporting plate flat plate after blanking is placed on the mould, and the spiral supporting plate is pressed by multiple pressing and staying for a certain time, releasing stress and pressing the spiral supporting plate;
3) examination of
Placing a special detection mould on the spiral supporting plate which is just pressed, and if the spiral surface of the spiral supporting plate and the spiral surface of the detection mould are completely superposed, returning the spiral supporting plate and the spiral surface of the detection mould to the press again for pressing till the spiral surface and the detection spiral surface are completely attached;
4) simulated installation positioning processing groove
After a spiral supporting plate and a fixed stirring shaft are installed in a simulated mode, a positioning device is manufactured to position and align the spiral supporting plate, the spiral supporting plate is fixed, the site installation position is simulated, the accurate side line position and the accurate positioning hole position of the spiral supporting plate are determined on the upper spiral surface of the spiral supporting plate on the horizontal steel plate surface according to the projection principle, marked lines are used for carving, after the simulated stirring shaft is removed, a compensation edge is removed according to the accurate side line position shown by a simulated time mark line, and a groove is machined;
5) positioning drill hole
Although an accurate positioning hole is found, an auxiliary drilling tool is needed for drilling on the spiral surface of the spiral supporting plate to position a workpiece, the drilling tool is divided into two parts, one part is a circular pipe bracket pin shaft (6) connected with the spiral supporting plate, the bracket pin shaft (6) is spot-welded at the drilling hole of the spiral supporting plate (5), the center of the bracket pin shaft (6) is superposed with the center of the drilling hole, each hole of the spiral supporting plate needs one bracket pin shaft (6), the other part of the tool respectively penetrates through the base (8) and the shaft sleeve (7) through a bolt (10) to be fixed on a drilling machine base (9), the inner diameter of the shaft sleeve (7) is matched with the outer diameter of the bracket pin shaft (6), the bracket pin shaft (6) is inserted into the lower shaft sleeve (7) during drilling, each hole drilled in the spiral supporting plate (5) is ensured to be vertical to the spiral surface of the supporting plate (5), and the hole diameter is measured, and (5) disassembling the tool after the standard is met, and cleaning and polishing away surface welding slag.
2. The manufacturing method of the spiral supporting plate of the large vertical mill according to the claim (1), wherein the drilling tool comprises a drilling machine base (9), a base (8), a shaft sleeve (7) and a bracket pin shaft (6), the base (8) is arranged on the drilling machine base (9), the shaft sleeve (7) is arranged on the base (8), the bracket pin shaft (6) is inserted in the shaft sleeve (7), and the shaft sleeve (7), the base (8) and the drilling machine base (9) are fixed together through a bolt (10).
3. The manufacturing method of the spiral supporting plate of the large vertical mill according to claim 2, wherein the bracket pin shaft (6) is in a circular tube shape with a large outer diameter at the top and a small outer diameter at the bottom, and the small outer diameter at the bottom is clamped in the shaft sleeve (7).
4. The manufacturing method of the spiral supporting plate of the large vertical mill according to claim 2, characterized in that the vertical section of the drilling machine base (1) is in an inverted concave shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010766511.XA CN111889978B (en) | 2020-08-03 | 2020-08-03 | Manufacturing method of spiral supporting plate of large vertical mill |
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| CN202010766511.XA CN111889978B (en) | 2020-08-03 | 2020-08-03 | Manufacturing method of spiral supporting plate of large vertical mill |
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| CN111889978B CN111889978B (en) | 2022-02-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352063A (en) * | 2021-05-24 | 2021-09-07 | 沈阳博成重型机械制造有限公司 | Method for machining seamless spiral blade |
| CN114700398A (en) * | 2022-03-04 | 2022-07-05 | 中国一冶集团有限公司 | Manufacturing method of large-size square-round reducer pipe |
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| CN114700398A (en) * | 2022-03-04 | 2022-07-05 | 中国一冶集团有限公司 | Manufacturing method of large-size square-round reducer pipe |
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| CN111889978B (en) | 2022-02-25 |
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