CN106863801A - A kind of solid propellant increasing material manufacturing system and outer surface rotational molding process - Google Patents
A kind of solid propellant increasing material manufacturing system and outer surface rotational molding process Download PDFInfo
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- CN106863801A CN106863801A CN201710043724.8A CN201710043724A CN106863801A CN 106863801 A CN106863801 A CN 106863801A CN 201710043724 A CN201710043724 A CN 201710043724A CN 106863801 A CN106863801 A CN 106863801A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Manufacturing & Machinery (AREA)
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Abstract
The invention discloses a kind of suitable for the 3D printer with rotary shaft of solid propellant increasing material manufacturing and the method using the 3D printer increasing material manufacturing solid propellant with rotary shaft.Shaped platform of the present invention changes into cylinder outer surface, will propellant charge cylinder outer surface be molded.First COMPOSITE SOLID PROPELLANT column model is designed with modeling software, then powder column model is done into expansion conversion with modeling software, the new three-dimensional stereo model for launching to be obtained after conversion is placed in 3D printing upper computer software with specific modes of emplacement, G code is cut into slices and generated finally by printing head extruded material, in cylinder outer surface layer upon layer, solid propellant grain is obtained.The mechanical property axially and radially gone up using the solid propellant of the 3D printer increasing material manufacturing with rotary shaft will be improved largely.
Description
Technical field
The invention belongs to 3D printing technique field, it is particularly a kind of suitable for solid propellant increasing material manufacturing with rotation
The 3D printer of axle and the method using the 3D printer increasing material manufacturing solid propellant with rotary shaft.
Background technology
Traditional solid thermoplastics propellant shaping manufacture mainly uses the molded technique of spiral shell, with the increasing of compact dimensions
Plus, device systems are also more and more huger, and the pressure required for shaping is significantly improved, and the energy resource consumption for being molded manufacture system increases,
Manufacture difficulty is significantly increased, and comprehensive manufacturing cost is increased substantially.The difficulty that more importantly Forming Quality of propellant is controlled
Also increase, manufacturing process occurs the dangerous raising of blast accident.Pushed away for highly filled thermoplasticity high-energy solid higher
Enter agent, the dispersing uniformity of material and the stability of mechanical property are the Key Quality Indicator for determining performance.Using spiral shell pressure
When expressing technique prepares solid propellant, as the raising briquetting pressure of proportion of filler can be increased substantially, sometime up to 30MPa
More than, the temperature that being molded needs can also be improved with the increase of solid packing.It is required that the bulk strength of screw extruder and portion
The intensity of part is very high, and equipment volume also accordingly increases.The introducing of solid packing can also bring material plasticizing degree not enough, material
The problems such as uneven, block materials the density of dispersion is inadequate.At present, the main method for solving the above problems is mainly using bigger
Size, intensity former higher, not only increase manufacturing cost, and production efficiency is also than relatively low.Additionally, using traditional spiral shell pressure
Technique prepares thermoplastic solid propellant, it is impossible to realize the compound change burn rate COMPOSITE SOLID PROPELLANT of some complex-shaped and many materials
Post.
The content of the invention
It is an object of the invention to provide it is a kind of can be using the thermoplastic of less device fabrication large scale and complicated shape
Property solid propellant 3D printer with rotary shaft and using the 3D printer increasing material manufacturing solid propellant propulsion with rotary shaft
The method of agent.
The technical solution for realizing the object of the invention is：A kind of 3D printing suitable for solid propellant increasing material manufacturing
Machine, including cylindric print platform, three stepper motors and printing head, wherein three stepper motors are respectively the first stepping electricity
Machine M1, the second stepper motor M2With the 3rd stepper motor M3；
The cylindric print platform exists around Cylindorical rod rotation, the Cylindorical rod and plane-parallel, cylindric print platform
Stepper motor M1Control under rotate；Printing head is located at the top of cylindrical outer, and in the second stepper motor M2With the 3rd stepping
Motor M3Control under move, the printing head is in the second stepper motor M2Control under moved along rotation axis horizontal, and the 3rd
Stepper motor M3Control under it is vertically moving；The use face of the cylindric print platform is cylinder outer surface.
The quantity of the printing head is at least 1, and spout is straight down.
A kind of Method of printing based on the above-mentioned 3D printer suitable for solid propellant increasing material manufacturing, including following step
Suddenly：
Step 1, solid propellant grain model to be printed is made to launch conversion, obtain new three-dimensional stereo model；Institute
The section of the middle solid propellant grain model stated includes internal combustion tubulose, internal combustion star, tubulose, wheel shape, dendriform, pipe sleeve
Type, dog bone shape, multi-groove shape hole and ellipse.
Described expansion conversion of making solid propellant grain model to be printed is specially：
Solid propellant grain model is placed in XYZ space rectangular coordinate system first quartile, solid propellant grain mould
The axle of type is parallel with X-axis, if the coordinate system is O1；For any section perpendicular to X-axis of solid propellant grain model, its
The coordinate of symmetrical centre be (x, y, z), section take up an official post one by one point coordinates be (x1, y1, z1), the symmetrical centre is taken up an official post to the section
The distance of any of anticipating is r=√ ((y-y1)2+(z-z1)2).If y1＜ y, then the point coordinates is after launching conversionIf y1>=y, then the point coordinates is after launching conversion
Step 2, the three-view diagram direction to above-mentioned new three-dimensional stereo model are defined；Specially：
By new three-dimensional stereo model in coordinate system O1In it is parallel with X-axis and point to the positive direction of X-axis be defined as it is new
The positive apparent direction of three-dimensional stereo model,
By new three-dimensional stereo model in coordinate system O1In it is parallel with Z axis and point to the positive direction of Z axis be defined as it is new
The overlook direction of three-dimensional stereo model；
By new three-dimensional stereo model in coordinate system O1In it is parallel with Y-axis and point to the positive direction of Y-axis be defined as it is new
The side-looking direction of three-dimensional stereo model.
Step 3, the above-mentioned new three-dimensional stereo model for defining three-view diagram direction is placed into Slice Software and is cut
Piece, and generate G code；It is described the new three-dimensional stereo model that defines three-view diagram direction is placed into Slice Software put
The method of putting is：
If the coordinate system of Slice Software is O2, positive apparent direction and the coordinate system O of new three-dimensional stereo model2In X-direction
Positive direction that is parallel and pointing to X-axis, mansion apparent direction and the coordinate system O of new three-dimensional stereo model2In Z-direction it is parallel and refer to
To the negative direction of Z axis, the side-looking direction and coordinate system O of new three-dimensional stereo model2In Y direction it is parallel and point to Y-axis
Negative direction.
Step 4, G code is input into suitable for the 3D printer of solid propellant increasing material manufacturing, is entered using printer
Row printing.Described 3D printer carries out printing shaping using thermoplastic solid propellant raw material.
Compared with prior art, remarkable advantage of the invention is：1) present invention is large-sized using less device fabrication
Solid propellant, the weight and system of former system are substantially reduced；2) material system is increased using the 3D printer with rotary shaft
Making the method for solid propellant can realize that labyrinth powder column or many materials become the one-shot forming of burn rate propellant；3) can be long-range
Control shaping has the advantages that process safety, shaping efficiency are high.4) shaped charge is higher in the mechanical property for axially and radially going up.
5) system can be controlled with common 3D printer control system.
Brief description of the drawings
Fig. 1 is cylinder shaped platform.
Fig. 2 is the view axially seen from the cylinder shaped platform of printing device.
Fig. 3 is the view seen by the radial direction of the cylinder shaped platform of printing device.
Fig. 4 is that cross section is tube grain model, wherein cross section of the figure (a) for shaped charge model, figure (b) is from medicine
The view that column model is radially seen.
Fig. 5 is that cross section is tube grain model expanded view, wherein figure (a) three-dimensional stereo model new after launching to convert
Top view, the front view of figure (b) three-dimensional stereo model new after launching to convert.
Fig. 6 is common plane platform shaped charge and the printing powder column accumulation mode contrast of cylinder outer surface shaped platform, figure
A () shows schematic diagram for the accumulation of common plane platform shaped charge, figure (b) is that cylinder outer surface shaped platform prints powder column
Accumulation mode schematic diagram.
Specific implementation method
A kind of 3D printer suitable for solid propellant increasing material manufacturing of the invention, including cylindric print platform 1, three
Individual stepper motor and printing head 2, wherein three stepper motors are respectively the first stepper motor M1, the second stepper motor M2With
Three stepper motor M3；
The cylindric print platform exists around Cylindorical rod rotation, the Cylindorical rod and plane-parallel, cylindric print platform
Stepper motor M1Control under rotate；Printing head is located at the top of cylindrical outer, and in the second stepper motor M2With the 3rd stepping
Motor M3Control under move, the printing head is in the second stepper motor M2Control under moved along rotation axis horizontal, and the 3rd
Stepper motor M3Control under it is vertically moving；The use face of the cylindric print platform is cylinder outer surface.It is described
The quantity of printing head is at least 1, and spout is straight down.
A kind of Method of printing based on the above-mentioned 3D printer suitable for solid propellant increasing material manufacturing, including following step
Suddenly：
Step 1, solid propellant grain model to be printed is made to launch conversion, obtain new three-dimensional stereo model；Tool
Body is：
Solid propellant grain model is placed in XYZ space rectangular coordinate system first quartile, solid propellant grain mould
The axle of type is parallel with X-axis, if the coordinate system is O1；For any section perpendicular to X-axis of solid propellant grain model, its
The coordinate of symmetrical centre be (x, y, z), section take up an official post one by one point coordinates be (x1, y1, z1), the symmetrical centre is taken up an official post to the section
The distance of any of anticipating is r=√ ((y-y1)2+(z-z1)2)；If y1＜ y, then the point coordinates is after launching conversionIf y1>=y, then the point coordinates is after launching conversion
The section of the solid propellant grain model include internal combustion tubulose, internal combustion star, tubulose, wheel shape, dendriform,
Pipe sleeve type, dog bone shape, multi-groove shape hole and ellipse.
Step 2, the three-view diagram direction to above-mentioned new three-dimensional stereo model are defined；Specially：
By new three-dimensional stereo model in coordinate system O1In it is parallel with X-axis and point to the positive direction of X-axis be defined as it is new
The positive apparent direction of three-dimensional stereo model；
By new three-dimensional stereo model in coordinate system O1In it is parallel with Z axis and point to the positive direction of Z axis be defined as it is new
The overlook direction of three-dimensional stereo model；
By new three-dimensional stereo model in coordinate system O1In it is parallel with Y-axis and point to the positive direction of Y-axis be defined as it is new
The side-looking direction of three-dimensional stereo model.
Step 3, the above-mentioned new three-dimensional stereo model for defining three-view diagram direction is placed into Slice Software and is cut
Piece, and generate G code；The laying method being placed into Slice Software is：
If the coordinate system of Slice Software is O2, positive apparent direction and the coordinate system O of new three-dimensional stereo model2In X-direction
Positive direction that is parallel and pointing to X-axis, mansion apparent direction and the coordinate system O of new three-dimensional stereo model2In Z-direction it is parallel and refer to
To the negative direction of Z axis, the side-looking direction and coordinate system O of new three-dimensional stereo model2In Y direction it is parallel and point to Y-axis
Negative direction.
Step 4, G code is input into suitable for the 3D printer of solid propellant increasing material manufacturing, is entered using printer
Row printing.The 3D printer carries out printing shaping using thermoplastic solid propellant raw material.
The present invention uses the weight and system of the large-sized solid propellant of less device fabrication, former system to show
Write and reduce.
It is described in more detail below.
A kind of 3D printer with rotary shaft suitable for solid propellant increasing material manufacturing, the 3D that should have rotary shaft beats
Print machine has 3 stepper motor M1、M2、M3；This has the print platform of the 3D printer of rotary shaft for the outer surface of cylinder, cylinder
Can be rotated around Cylindorical rod, by stepper motor M1Control, it is proposed that M1The kind of drive between cylinder is gear drive；There should be rotation
The material extrusion shower nozzle of the 3D printer of rotating shaft is in the top of cylindrical outer, and shower nozzle is in cylinder perpendicular to the diameter side of horizontal plane
Down, the shower nozzle direction of motion is the axial direction of vertical direction and cylinder to upward and spout, respectively by stepper motor M2And M3Control.
Printing head can have two or more if necessary, for printing different raw material.The 3D with rotary shaft beats
The structure schematic diagram of print machine as shown in Figure 1, Figure 2, Fig. 3.Using the solid propellant of the 3D printer increasing material manufacturing with rotary shaft
The mechanical property for axially and radially going up will be improved largely.
A kind of method using the upper described 3D printer increasing material manufacturing solid propellant with rotary shaft includes following
Step：
Step 1, solid propellant grain model is designed with modeling software.Such as 3Dmax, CAD, solidwork are soft
Part.Described solid propellant grain model has internal combustion tubulose, internal combustion star, tubulose, wheel shape, dendriform, pipe sleeve type, dog bone
Type, multi-groove shape hole, the oval this kind of solid propellant grain for having an endoporus.
Step 2, the solid propellant grain model for designing step 1 are made to launch conversion, solid propellant grain model
Expansion transform definition it is as follows:Solid propellant grain model is placed in XYZ space rectangular coordinate system first quartile,
The axle of solid propellant grain model is parallel with X-axis, if the coordinate system is O1.For solid propellant grain model
Any section, the coordinate of its symmetrical centre is (x, y, z), and section point coordinates one by one of taking up an official post is (x1, y1, z1), this pair
Center to the distance at any point on the section be called r=√ ((y-y1)2+(z-z1)2).If y1＜ y, then after launching conversion
The point coordinates isIf y1>=y, then the point coordinates is after launching conversionConversion is launched by this and obtains new three-dimensional stereo model.For tubulose
Propellant charge such as Fig. 4, such as Fig. 5 after launching conversion.
The three-view diagram direction of the new three-dimensional stereo model that step 3, definition step 2 are obtained:By new three-dimensional stereo model
In O1In it is parallel with X-axis and point to the positive apparent direction that the positive direction of X-axis is defined as new three-dimensional stereo model, by new three-dimensional
Three-dimensional model is in O1In it is parallel with Z axis and point to the mansion apparent direction that the positive direction of Z axis is defined as new three-dimensional stereo model, will
New three-dimensional stereo model is in O1In it is parallel with Y-axis and point to the side that the positive direction of Y-axis is defined as new three-dimensional stereo model
Apparent direction.
Step 4, the new three-dimensional stereo model that step 3 defines three-view diagram direction are placed in Printrun, Cura,
In the upper computer softwares such as Repetier-Host.If the coordinate system of upper computer software is O2, in O2In the new three-dimensional that is placed stand
The positive apparent direction of body Model is wanted and O2In X-direction it is parallel and point to X-axis positive direction, the mansion of new three-dimensional stereo model regards
Want and O in direction2In Z-direction it is parallel and point to the negative direction of Z axis, the side-looking direction of new three-dimensional stereo model will and O2In
Y direction it is parallel and point to Y-axis negative direction.Then cut into slices, generated G code, it is proposed that described new 3 D stereo
It is straight line that model fills track in Slice Software configuration, and packed density is 1, closely knit with excellent mechanical performances to obtain
Propellant charge, propellant charge simplified schematic diagram such as Fig. 6 is molded, for Fig. 6 (a) due to axially layer upon layer, powder column
Mechanical property is poor vertically, and for Fig. 6 (b) because mechanical property vertically is better than A.
Step 5, the G code that step 4 is obtained is transferred to the 3D printer with rotary shaft described in right 1, using heat
The solid propellant raw material of plasticity carries out printing shaping.M1Receive the G code of Y-direction motion, M2Receive the G generations of Z-direction motion
Code, M3Receive the G code from X-direction motion.For baroque propellant charge, need to print water-soluble branch if necessary
Timbering material, is molded in order to powder column and is easy to remove backing material after powder column shaping.
The expansion of solid propellant grain model conversion is given an actual example below is illustrated.
Embodiment 1
It is as shown in Figure 4 r for tubular propellant powder column radius2, internal orifice dimension is r1, any point to the section on section
The distance of symmetrical centre is r3(r1≤r3≤r2), a length of L.
It is r by powder column cross sectional radius3Locate the π r of Zhou Changwei 23=L1, dL can be obtained1/dr3=2 π, you can enter cylinder powder column
Row launches conversion, such as Fig. 5.
Powder column launch after conversion for cross section for isosceles trapezoid right prism wherein isosceles trapezoid waist and base angle theta=
90 ° of-arctant π, upper bottom is 2 π r1, it is 2 π r to go to the bottom2, a height of r2-r1。
Claims (8)
1. a kind of 3D printer suitable for solid propellant increasing material manufacturing, it is characterised in that including cylindric print platform
(1), three stepper motors and printing head (2), wherein three stepper motors are respectively the first stepper motor M1, the second stepping electricity
Machine M2With the 3rd stepper motor M3；
, around Cylindorical rod rotation, the Cylindorical rod and plane-parallel, cylindric print platform is in stepping for the cylindric print platform
Motor M1Control under rotate；Printing head is located at the top of cylindrical outer, and in the second stepper motor M2With the 3rd stepper motor
M3Control under move, the printing head is in the second stepper motor M2Control under moved along rotation axis horizontal, and in the 3rd stepping
Motor M3Control under it is vertically moving；The use face of the cylindric print platform is cylinder outer surface.
2. the 3D printer suitable for solid propellant increasing material manufacturing according to claim 1, it is characterised in that printing spray
The quantity of head is at least 1, and spout is straight down.
3. it is a kind of based on described in claim 1 suitable for solid propellant increasing material manufacturing 3D printer Method of printing, it is special
Levy and be, comprise the following steps：
Step 1, solid propellant grain model to be printed is made to launch conversion, obtain new three-dimensional stereo model；
Step 2, the three-view diagram direction to above-mentioned new three-dimensional stereo model are defined；
Step 3, the above-mentioned new three-dimensional stereo model for defining three-view diagram direction is placed into Slice Software and is cut into slices, and
Generation G code；
Step 4, G code is input into suitable for the 3D printer of solid propellant increasing material manufacturing, is beaten using printer
Print.
4. Method of printing according to claim 3, it is characterised in that step 1 is by solid propellant grain mould to be printed
Type is made expansion conversion and is specially：
Solid propellant grain model is placed in XYZ space rectangular coordinate system first quartile, solid propellant grain model
Axle is parallel with X-axis, if the coordinate system is O1；For any section perpendicular to X-axis of solid propellant grain model, its is symmetrical
The coordinate at center be (x, y, z), section take up an official post one by one point coordinates be (x1, y1, z1), it is any one in the symmetrical centre to the section
The distance of point is r=√ ((y-y1)2+(z-z1)2)；If y1＜ y, then the point coordinates is after launching conversionIf y1>=y, then the point coordinates is after launching conversion
5. Method of printing according to claim 3, it is characterised in that the three-view diagram of the new three-dimensional stereo model of step 2 pair
Direction is defined specially：
By new three-dimensional stereo model in coordinate system O1In it is parallel with X-axis and point to the positive direction of X-axis and be defined as new three-dimensional and stand
The positive apparent direction of body Model；
By new three-dimensional stereo model in coordinate system O1In it is parallel with Z axis and point to the positive direction of Z axis and be defined as new three-dimensional and stand
The overlook direction of body Model；
By new three-dimensional stereo model in coordinate system O1In it is parallel with Y-axis and point to the positive direction of Y-axis and be defined as new three-dimensional and stand
The side-looking direction of body Model.
6. Method of printing according to claim 3, it is characterised in that step 3 pair defines new three in three-view diagram direction
The dimension laying method that is placed into Slice Software of three-dimensional model is：
If the coordinate system of Slice Software is O2, positive apparent direction and the coordinate system O of new three-dimensional stereo model2In X-direction it is parallel
And point to the positive direction of X-axis, mansion apparent direction and the coordinate system O of new three-dimensional stereo model2In Z-direction it is parallel and point to Z
The negative direction of axle, side-looking direction and the coordinate system O of new three-dimensional stereo model2In Y direction it is parallel and point to Y-axis losing side
To.
7. Method of printing according to claim 3, it is characterised in that the 3D printer in step 4 is using thermoplastic solid
Body propellant raw material carries out printing shaping.
8. Method of printing according to claim 3, it is characterised in that the section of solid propellant grain model in step 1
Including internal combustion tubulose, internal combustion star, tubulose, wheel shape, dendriform, pipe sleeve type, dog bone shape, multi-groove shape hole and ellipse.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286477A (en) * | 2022-06-30 | 2022-11-04 | 湖北航天化学技术研究所 | Solid propellant/coating layer integrated additive manufacturing interface structure |
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| CN104191619A (en) * | 2014-09-12 | 2014-12-10 | 长沙梵天网络科技有限公司 | 3D (3-Dimensional) printing method |
| US20150021832A1 (en) * | 2013-07-18 | 2015-01-22 | Mitsubishi Electric Research Laboratories, Inc. | Method and Apparatus for Additively Manufacturing of Objects Based on Tensile Strength |
| CN106003728A (en) * | 2016-06-28 | 2016-10-12 | 杭州铭展网络科技有限公司 | 3D printer for cylindrical wall forming |
| CN205871201U (en) * | 2016-06-28 | 2017-01-11 | 杭州铭展网络科技有限公司 | Be used for fashioned 3D printer of drum wall |
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- 2017-01-19 CN CN201710043724.8A patent/CN106863801B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150021832A1 (en) * | 2013-07-18 | 2015-01-22 | Mitsubishi Electric Research Laboratories, Inc. | Method and Apparatus for Additively Manufacturing of Objects Based on Tensile Strength |
| CN104191619A (en) * | 2014-09-12 | 2014-12-10 | 长沙梵天网络科技有限公司 | 3D (3-Dimensional) printing method |
| CN106003728A (en) * | 2016-06-28 | 2016-10-12 | 杭州铭展网络科技有限公司 | 3D printer for cylindrical wall forming |
| CN205871201U (en) * | 2016-06-28 | 2017-01-11 | 杭州铭展网络科技有限公司 | Be used for fashioned 3D printer of drum wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115286477A (en) * | 2022-06-30 | 2022-11-04 | 湖北航天化学技术研究所 | Solid propellant/coating layer integrated additive manufacturing interface structure |
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