CN101402165A - Method for manufacturing multi-rod junction lamella type space net shell cast steel node - Google Patents

Method for manufacturing multi-rod junction lamella type space net shell cast steel node Download PDF

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Publication number
CN101402165A
CN101402165A CNA2008101531676A CN200810153167A CN101402165A CN 101402165 A CN101402165 A CN 101402165A CN A2008101531676 A CNA2008101531676 A CN A2008101531676A CN 200810153167 A CN200810153167 A CN 200810153167A CN 101402165 A CN101402165 A CN 101402165A
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node
structural unit
parameters
net shell
mould
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CN100595020C (en
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梅江平
黄田
丁雅斌
龚元
龚建达
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Tianjin University
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Tianjin University
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Abstract

The invention discloses a method for manufacturing cast steel nodes of a multi-rod converging flap type space net shell. The method comprises the following steps: an axis model of a designed multi-rod converging flap type space net shell structure is established; the coordinate parameters and the dimensions of total nodes and rod pieces are input to a computer; each node is decomposed into a plurality of construction units; dimension data and machining parameters are calculated; according to the result of the calculated dimension data and the machining parameters, a three-dimensional entity model of each node is reconstructed; the dimension data and the machining parameters of the construction units of each node are output; the parameters are input to five-DOF (degree of freedom) numerical control equipment to control and manufacture a mould of each construction unit; a spliced and integrated node casting mould is used as a mould; an expendable pattern casting process is adopted to cast molten steel to form a node roughcast; and the node roughcast is subjected to mechanical machining to manufacture a finished product. The product manufactured by the method has the advantages of good integrated mechanical property, simple process flow and low manufacturing cost, can ensure the needed precision and the like.

Description

A kind of multi-rod junction lamella type space net shell cast steel node preparation method
Technical field
The present invention relates to of the application of a kind of 5DOF numerical control equipment, particularly relate to a kind of multi-rod junction lamella type space net shell cast steel node preparation method in building trade.
Background technology
The space net shell structure is a kind of with the building structure of space bar by connecting and composing with a plurality of nodes, is large stadium roof and all kinds of main way of realization that needs space curved surface moulding decorative constructure.In order to adapt to any variation of space angle, space net shell structure node in the past adopts steel pipe to pass through welding or sphere nodes mechanical connection manner mutually usually, and rod member adopts round steel (pipe) usually, so that structural design and on-the-spot installation.Yet the steel pipe tubular joint is not only made difficulty is installed, and causes big welding stress because of weld seam is too concentrated, thereby influences structure bearing capacity; Though and sphere nodes is made simply, because of volume greatly often influences the attractive in appearance of building space surface modeling.In recent years, in order to satisfy the requirement of aspects such as modern space latticed shell structure mechanics, aesthetics and function, a class multi-rod crossing valve type net shell node has appearred.This category node has profile can be changed with the whole building curved surface, be easy to and advantages such as all kinds of profiled-cross-sections (as triangle, rectangle, trapezoidal) rod member is connected, thereby can constitute the space curved surface architectural image of various novel and beautiful, become the important development trend of present one big class high-decoration space net shell construction.At present, abroad the manufacturing technology to multi-rod crossing valve type net shell node generally adopts steel plate numerical control blanking-welding-processing method, promptly earlier steel plate is made into different units through cutting, the processing of limit mouth and pressure forming, with mold the laggard row of their assembly unit moulding is welded then, last finish machining with leverage faying face/hole face, this methods of domestic also many employings at present with 5 interlock machining centers again.Yet because the space net shell structure comprises usually and reach thousands of the nodes that geometry is different, so numerical control blanking-welding-processing method needs a large amount of pressure forming moulds and welds mold, and cost of manufacture is high and efficient is very low.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of on the basis that guarantees machining accuracy, reduce the cost of manufacture of this category node, improve a kind of multi-rod junction lamella type space net shell cast steel node preparation method of make efficiency.
A kind of multi-rod junction lamella type space net shell cast steel node preparation method of the present invention, it may further comprise the steps:
(1) set up design the multi-rod converging valve type space net shell structure the axis model and with coordinate parameters, the dimensional parameters input computer of its whole nodes and rod member;
(2) described each node is decomposed into a plurality of structural units;
(3) calculate the sized data and the machined parameters of each structural unit;
(4) according to the sized data and the machined parameters result of described calculating, reconstruct the three-dimensional entity model of described each node, the model of each node of described design and described reconstruction model carried out figure is checked and data are checked, check-node decomposes the model of each node that reconstructs the design whether data calculated the back can be correct, finally exports the sized data and the machined parameters thereof of the structural unit of each node;
(5) prepare expanded material;
(6) with the sized data and the machined parameters input 5DOF numerical control equipment thereof of the structural unit of described each node, control cutting or described foaming material shaped each the structural unit mould that makes of milling;
(7) described a plurality of structural unit moulds are assembled into complete node casting mould;
(8) described complete node casting mould is adopted lost foam casting process as mould, the casting molten steel is cast the node blank;
(9) described 5DOF numerical control equipment reads node coordinate parameter, the dimensional parameters in the described step (1) and generates numerical control machining code, and the described node blank of machining makes finished product.
The present invention compared with prior art, its advantage is:
1 existing method " numerical control blanking-welding-processing " need prepare mould at each node, as does not have quick, low-cost mold making technology and can support utilization with equipment, and then this method exists efficient low, problems such as cost height.And new method is made in " dividing mould-molding-group mould-casting-processing " digitlization that the present invention proposes, with expanded material cheaply as the node mold materials that disappears, based on CAD/CAPP/CAM and 5DOF numerical control equipment, the made product has that whole mechanical property is good, technological process is simple, cost of manufacture is low, can guarantee advantages such as required precision;
2 existing node tools are adopted 5 interlock machining centers more, yet 5 interlock machining centers cost an arm and a leg, and its precision is far above the required precision of node, therefore cause unnecessary waste, the architectural node of the same space net shell comes in every shape in addition, One's name is legion is changed workpiece/anchor clamps required times much larger than process time, and what therefore be difficult to the equipment of bringing into play should be profitable.And the present invention adopts the 5DOF numerical control equipment to make the node mold, obtains the cast steel node blank by lost foam casting at last, solve 5 axis linkage numerical control machining center cost height, be difficult to bring into play its precision advantage, and problem such as the clamping workpiece time is long.
Description of drawings
Fig. 1 is the flow chart of a kind of multi-rod junction lamella type space net shell cast steel node preparation method of the present invention;
Fig. 2 is the axis model of a construction example;
Fig. 3 is decomposed into 8 structural units and the cylindrical model that is connected each unit with a node among described Fig. 2;
Fig. 4 is the processing model of a structural unit among Fig. 3, and wherein 1 is the right flank of left adjacent structural unit, and 2 is the face of cylinder, and 3 is the left surface of right adjacent structural unit, and 4 is right machined surface, and 5 is end face, and 6 is left machined surface;
Fig. 5 is the expanded material as the standard of the structural unit mould use of making node;
Fig. 6 is a multi-rod crossing valve type net shell node that adopts the inventive method to make.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
Be the flow chart of a kind of multi-rod junction lamella type space net shell cast steel node preparation method provided by the present invention, 1. analysis node model as shown in Figure 1: set up the axis model of the multi-rod converging valve type space net shell structure that designs and coordinate parameters, the dimensional parameters of its whole nodes and rod member are imported computer; Described each node is decomposed into a plurality of structural units; Calculate the sized data and the machined parameters of each structural unit; Sized data and machined parameters result according to described calculating, reconstruct the three-dimensional entity model of described each node, the model of each node of described design and described reconstruction model carried out figure is checked and data are checked, check-node decomposes the model of each node that reconstructs the design whether data calculated the back can be correct, finally exports the data and the machined parameters thereof of the structural unit of each node; 2. joint structure unit mold is made: prepare expanded material; With the data and the machined parameters input 5DOF numerical control equipment thereof of the structural unit of described each node, control cutting or described foaming material shaped each the structural unit mould that makes of milling; 3. node mold assembly unit: described a plurality of structural unit moulds are assembled into complete node casting mould; 4. node casting: described complete node casting mould is adopted lost foam casting process as mould, and the casting molten steel is cast the node blank; 5. node machining: described 5DOF numerical control equipment reads node coordinate parameter, the dimensional parameters in the described step (1) and generates numerical control machining code, and the described node blank of machining makes finished product.
Lift a specific embodiment in conjunction with the accompanying drawings below, concrete technical scheme of the present invention is described.
The axis model (as Fig. 2) that first step importing Architecture Design Institute provides, node coordinate file, sectional dimension file etc.; Decompose node then, because each node comprises a plurality of structural units, and the pose of each structural unit has nothing in common with each other, in order to improve make efficiency and to reduce cost, so further decompose node, equidistant point with the adjacent side of every adjacent two structural units is a decomposition face, each node is split as a plurality of structural units and the cylinder that is connected each unit of node, and this node shown in Figure 3 comprises 8 structural units; Next calculate their machined parameters, cylindrical machined parameters is a fixed value, determine that according to this node size that design institute gives cylindrical radius is 30mm, the machined parameters of structural unit is made up of 4 parts, comprise left machined surface 6, right machined surface 4, the end face 5 and the face of cylinder 2, the left side of structural unit wherein, the machined parameters of right machined surface is by the relativeness decision of the structural unit adjacent with its left and right sides, shown in Figure 4 is the machined parameters of the structural unit of one of them, wherein the right flank 1 of the structural unit on the left surface of this structural unit and the adjacent left side intersects, obtain the equidistant point position of intersecting the two sides, ask the cross surface of equidistant point and structural unit left surface again, with this left machined surface 6, in like manner can ask the right machined surface 4 between the left surface 3 of the right flank of described structural unit and right adjacent structural unit as structural unit; Structural unit end face 5 is the faying faces that link to each other with rod member, and the distance between 4 summits of end face is measure-alike with the bar cross section that designing institute provides; The radius on the structural unit face of cylinder is identical with the cylinder radius of fractionation, has guaranteed that structural unit can fit together with cylinder; After obtaining the machined parameters of these 8 structural units, be input in AutoCAD software, carry out that figure is checked and data are checked, reconstruct the three-dimensional entity model of this node, the result was correct after the related data that provides with designing institute was carried out verification, the machined parameters of 8 structural units of final output node.
Second step, make the mold of joint structure unit, adopt cheaply expanded material as the node mold materials that disappears, this kind expanded material all is made into unified standard module (as Fig. 5) before entering factory, and provide standard module quality inspection report, and use the 5DOF numerical control equipment then, read in the machined parameters that the first step provides, standard module is cut or milling, and finished product is the mold of 8 structural units.
The 3rd step, the assembly unit of node mold, 8 structural units that obtain in second step are assembled into whole mold in order, and with three coordinate machine check assembly unit quality, measure the catercorner length of each structural unit end face and the angle between adjacent two structural units, measurement result deposits database and whether qualified with check with the design data contrast in, the error in length degree of accuracy is 0.1mm, the angular error degree of accuracy 0.5 degree, this node mould of making through check satisfies condition, provide the finishing die quality control pickup, to node finishing die number record.
The 4th step, adopt lost foam casting technology molten steel casting node, and detect castability, provide the chemical composition checklist.
In the 5th step, node machining, is made three-dimensional to finished product and is detected node blank machining with Digit Control Machine Tool, provides appearance and size acceptance test report, can dispatch from the factory (as shown in Figure 6).
Described 5DOF numerical control equipment can adopt 5DOF series-parallel robot (number of patent application: 200710057178.X, publication number: CN101049692).
Advantage of the present invention is: the invention provides a cover multi-rod junction lamella type space net shell cast steel node and " divide mould-molding-group mould-casting Make-process " the digitlization preparation method. Utilize the 5DOF numerical control equipment independently to make each structural unit model of node, then Be spliced into complete nodal analysis method, the recycling Technology of EPC is cast into node blank and machining. Contrast this category node system Make existing steel plate " numerical control blanking-welding-processing " method, namely earlier steel plate is made into through cutting, the processing of limit mouth and pressure forming Different units welds the laggard row of their assembly unit moulding with mold then, finishes with leverage with 5 axles interlock machining center more at last and ties Close the machining of face/hole face, because Spatial Lattice Shells usually comprises and reaches thousands of the nodes that geometry is different, these class methods Need a large amount of pressure forming dies and welding mold, cost of manufacture is high but efficient is very low. Preparation method provided by the invention is in conjunction with 5 Free degree numerical control equipment is made product and is had that whole mechanical property is good, technological process is simple, the inefficient height of cost of manufacture, can guarantee The advantages such as required precision, in addition, this invention is to leading novel joint making machine people technology in the application of building trade, and satisfies The demand that building trade is made the digitlization of characters for big span space grid truss hull shape multi-rod junction lamella type node, significant.

Claims (3)

1. multi-rod junction lamella type space net shell cast steel node preparation method is characterized in that it may further comprise the steps:
(1) set up design the multi-rod converging valve type space net shell structure the axis model and with coordinate parameters, the dimensional parameters input computer of its whole nodes and rod member;
(2) described each node is decomposed into a plurality of structural units;
(3) calculate the sized data and the machined parameters of each structural unit;
(4) according to the sized data and the machined parameters result of described calculating, reconstruct the three-dimensional entity model of described each node, the model of each node of described design and described reconstruction model carried out figure is checked and data are checked, check-node decomposes the model of each node that reconstructs the design whether data calculated the back can be correct, finally exports the sized data and the machined parameters thereof of the structural unit of each node;
(5) prepare expanded material;
(6) with the sized data and the machined parameters input 5DOF numerical control equipment thereof of the structural unit of described each node, control cutting or described foaming material shaped each the structural unit mould that makes of milling;
(7) described a plurality of structural unit moulds are assembled into complete node casting mould;
(8) described complete node casting mould is adopted lost foam casting process as mould, the casting molten steel is cast the node blank;
(9) described 5DOF numerical control equipment reads node coordinate parameter, the dimensional parameters in the described step (1) and generates numerical control machining code, and the described node blank of machining makes finished product.
2. a kind of multi-rod junction lamella type space net shell cast steel node preparation method according to claim 1 is characterized in that: the decomposition node in the described step (2) comprises a plurality of structural units and the cylinder that is connected each unit that each node are split as node.
3. a kind of multi-rod junction lamella type space net shell cast steel node preparation method according to claim 2, it is characterized in that: the machined parameters of the structural unit of described node is by comprising a left side, right machined surface, 4 parts on the end face and the face of cylinder are formed, a described left side, the machined parameters of right machined surface be crossing with the right flank or the left surface of the structural unit on the left surface of each structural unit or right flank and the adjacent left side or the right, obtain the equidistant point position of intersecting the two sides, ask the cross surface of equidistant point and structural unit left surface or right flank again, with this left machined surface or right machined surface as structural unit, described cylindrical machined parameters is the fixed value by the decision of the node size in the described step (1), described end face is the faying face that links to each other with rod member, distance between 4 summits of described end face is measure-alike with the bar cross section in the described step (1), the radius on the described structural unit face of cylinder is identical with the cylinder radius of fractionation, has guaranteed that structural unit can fit together with cylinder.
CN200810153167A 2008-11-20 2008-11-20 Multi-stem converged valva type spacenet shell cast steel node manufacturing method Active CN100595020C (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101556704A (en) * 2009-05-19 2009-10-14 武汉一冶钢结构有限责任公司 Method for establishing temporary supporting frame system assembled by steel structures
CN102661046A (en) * 2012-05-31 2012-09-12 中国二十二冶集团有限公司 Method for manufacturing tubular joint of small-angle fully bent tube
CN102945568A (en) * 2012-10-22 2013-02-27 江阴纳尔捷机器人有限公司 Data processing method of spatial reticulated shell structure
CN103424056A (en) * 2013-08-24 2013-12-04 中国北车集团大同电力机车有限责任公司 Curved-surface angle plate forming and detection method
CN107243597A (en) * 2017-06-06 2017-10-13 珠海市晶艺玻璃工程有限公司 A kind of preparation method of building node wax base
CN117113518A (en) * 2023-10-24 2023-11-24 北京城建集团有限责任公司 9-direction converging space net shell cast steel node accurate installation construction method and cast steel node

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101556704A (en) * 2009-05-19 2009-10-14 武汉一冶钢结构有限责任公司 Method for establishing temporary supporting frame system assembled by steel structures
CN101556704B (en) * 2009-05-19 2013-04-03 武汉一冶钢结构有限责任公司 Method for establishing temporary supporting frame system assembled by steel structures
CN102661046A (en) * 2012-05-31 2012-09-12 中国二十二冶集团有限公司 Method for manufacturing tubular joint of small-angle fully bent tube
CN102661046B (en) * 2012-05-31 2014-09-24 中国二十二冶集团有限公司 Method for manufacturing tubular joint of small-angle fully bent tube
CN102945568A (en) * 2012-10-22 2013-02-27 江阴纳尔捷机器人有限公司 Data processing method of spatial reticulated shell structure
CN102945568B (en) * 2012-10-22 2015-09-30 江阴纳尔捷机器人有限公司 A kind of data processing method of Spatial Lattice Shells
CN103424056A (en) * 2013-08-24 2013-12-04 中国北车集团大同电力机车有限责任公司 Curved-surface angle plate forming and detection method
CN107243597A (en) * 2017-06-06 2017-10-13 珠海市晶艺玻璃工程有限公司 A kind of preparation method of building node wax base
CN107243597B (en) * 2017-06-06 2018-06-26 珠海市晶艺玻璃工程有限公司 A kind of preparation method of building node wax base
CN117113518A (en) * 2023-10-24 2023-11-24 北京城建集团有限责任公司 9-direction converging space net shell cast steel node accurate installation construction method and cast steel node
CN117113518B (en) * 2023-10-24 2024-03-08 北京城建集团有限责任公司 9-direction converging space net shell cast steel node accurate installation construction method and cast steel node

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