CN113799086B

CN113799086B - Design expansion method of small tool

Info

Publication number: CN113799086B
Application number: CN202111076217.7A
Authority: CN
Inventors: 常志军; 刘保华; 黄健
Original assignee: Jiangnan Shipyard Group Co Ltd
Current assignee: Jiangnan Shipyard Group Co Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2023-03-14
Anticipated expiration: 2041-09-14
Also published as: CN113799086A

Abstract

The invention provides a design unfolding method of a small tool, which comprises the following steps: making a front view of the small tool according to the design and manufacturing requirements of the small tool, wherein the small tool comprises a first pipe, a second pipe penetrating through the first pipe and a bottom plate penetrating through the first pipe and the second pipe; and subsequently, acquiring an expanded view of the first pipe, an opening line on the first pipe and an expanded view of the second pipe from the front view of the small-sized tool. The invention relates to a design and expansion method of a small-sized tool, which is characterized in that a special tool design drawing is drawn through CAD software, and the special tool is expanded by a design lofting and expansion method, so that plate material marking is carried out, through holes are directly cut out in the processes of blanking and cutting, then rolling is carried out, and the special tool is assembled and welded through subsequent operation, so that the precision of penetrating and opening holes of pipes of the small-sized tool is improved, and the production efficiency is improved.

Description

Design expansion method of small tool

Technical Field

The invention relates to the technical field of small tool design for ship building, in particular to a design expansion method for a small tool.

Background

In the ship building process, production operators need to fix products by means of the aid of production tools and a backer operation method in the process of assembling and positioning the products, but conventional tools cannot meet the size of the assembled parts of the products, and small tooling parts are needed to be used in an assembly area to achieve the fixing effect. However, the small tool piece is a non-standard piece which is independently developed, the size of a component needs to be subjected to blanking, cutting, hole rotating and assembling again, the pipe is formed by rolling and processing a flat plate, and the small tool piece needs to penetrate one pipe into the other pipe, so that a hole for the small pipe to penetrate through needs to be processed on the flat plate of the large pipe before rolling. At present, the problems of low precision, complex operation steps, low production efficiency and the like exist in the hole opening of a flat plate of a large-size pipe at the penetrating position.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method for designing and expanding a small tool, which draws a special tool design drawing through CAD software, expands the special tool by a method of designing, lofting and expanding, and performs plate material marking, and welds the special tool in a post-process operation to form a special tool, thereby solving the problems of low precision, complex operation steps, low production efficiency and the like existing in the hole drilling at the penetrating part of the small tool.

In order to achieve the above and other related objects, the present invention provides a method for unfolding a design of a small tool, comprising the steps of:

s1, making a front view of a small tool according to design and manufacturing requirements of the small tool, wherein the small tool comprises a first pipe, a second pipe penetrating through the first pipe and a bottom plate penetrating through the first pipe and the second pipe;

s2, in a front view of the small tool, drawing a first circle by using the diameter of a first pipe fitting, wherein the first circle is tangent to an extension line of the side edge of the first pipe fitting; equally dividing the first circle into 12 parts along the circumference, and respectively marking the dividing points as 1'-12'; making axial extension lines of the first pipe fitting along the dividing points, wherein each axial extension line extends to the top end of the first pipe fitting and is a first equal-dividing line;

s3, in the front view of the step S2, drawing a second circle by the diameter of the second pipe fitting, wherein the second circle is tangent to the extension line of the side edge of the second pipe fitting; equally dividing the second circle into 12 parts along the circumference, and respectively marking the dividing points as 1' -12"; making axial extension lines along the second pipe fitting along each division point, wherein each axial extension line extends to the top end of the second pipe fitting and is a second bisector;

s4, in the front view of the step S3, a line which passes through the center of the first circle in the first bisectors is a first central line, and a line which passes through the center of the second circle in the second bisectors is a second central line; the multiple first bisectors are intersected with the second center line to obtain intersection points A1-A7, wherein the intersection point of the first center line and the second center line is A4;

s5, in the front view of the step S4, making a vertical line along the extension line of the second center line, translating the intersection points A1-A7 to the extension line of the second center line, and enabling the intersection points A4 and the intersection points of the second center line and the vertical line to coincide to obtain intersection points B1-B7;

s6, in the front view of the step S5, respectively making a vertical line of a second central line along the intersection points B1-B7, measuring the vertical distance from each division point 1' -12' in the first circle to the diameter perpendicular to the first central line in the first circle, translating the length of the vertical distance to each vertical line of the intersection points B1-B7 to obtain points C1-C12, namely the point C1 is on the extension line of the second central line, and the vertical distance between the point C2 and the extension line of the second central line is the vertical distance between the division point 2' and the diameter of the first circle, and so on; connecting C1-C12 points in sequence by adopting a smooth curve to obtain an elliptical section of the first pipe fitting; wherein B1 and C1 coincide, and B7 and C7 coincide;

s7, in the front view of the step S6, extending the second bisector of the second pipe fitting and penetrating through the elliptic section of the first pipe fitting to obtain intersection points D1-D14; meanwhile, defining an extension line of the second bisector as a first intersecting line;

s8, in the front view of the step S7, the second central line divides the elliptic section of the first pipe fitting into two halves, the elliptic section and the first intersecting line on the right half side of the first central line are selected and translated to the top end of the first pipe fitting, and then the first central line of the first pipe fitting penetrates through the center point of the translated elliptic section;

s9, in the front view of the step S8, intersection points of the translated elliptical cross section and the first intersecting line are D1-D8, wherein the intersection points D1 and D8 are on the top end line of the first pipe fitting, a projection line perpendicular to the top end line of the first pipe fitting is made along the intersection points D2-D6, the projection line of the D2-D6 and the top end line of the first pipe fitting are provided with projection points, parallel lines of the first bisector are made along the projection points and the intersection points D1 and D8, and the parallel lines are respectively intersected with the second bisector; the intersection points of the parallel line made from the intersection point D1 and the two outermost second bisectors are respectively E1 and E7, the intersection points of the parallel line made from the projection point of the intersection point D2 and the right second bisector and the left second bisector are respectively E2 and E6, the intersection points of the parallel line made from the projection point of the intersection point D3 and the right third bisector and the left third bisector are respectively E3 and E5, and the intersection point of the parallel line made from the projection point of the intersection point D4 and the middle second bisector is E4; similarly, the intersection points of the parallel line made from the intersection point D8 and the two outermost second bisectors are respectively E8 and E14, the intersection points of the parallel line made from the projection point of the intersection point D7 and the right second bisector and the left second bisector are respectively E9 and E13, the intersection points of the parallel line made from the projection point of the intersection point D6 and the right third bisector and the left third bisector are respectively E10 and E12, and the intersection point of the parallel line made from the projection point of the intersection point D5 and the middle second bisector is respectively E11; connecting E1-E7 in sequence by using a smooth curve to obtain a first through hole line of the first pipe fitting, and connecting E8-E14 in sequence by using a smooth curve to obtain a second through hole line of the first pipe fitting;

s10, in the front view of the step S9, making an expansion view of the first pipe: vertically making a first normal line along the first central line, selecting a section of straight line segment with the same length as the circumference of the first pipe fitting on the first normal line, and equally dividing the straight line segment into 12 parts; making parallel lines of the first central line along each division point to obtain a first pipe expansion line, and defining the middle first pipe expansion line as a third central line; parallel lines of a first normal line are made from bottom edges of the first pipe fitting and bottom intersection points of the first bisector line, intersection points of the parallel lines made from the leftmost bottom intersection point X1 and the third center line are Y1, intersection points of the parallel lines made from the left second bottom intersection point X2 and first pipe fitting deployment lines on the left and right sides of the third center line are Y2 and Y3, intersection points of the parallel lines made from the left third bottom intersection point X3 and second pipe fitting deployment lines on the left and right sides of the third center line are Y4 and Y5, intersection points of the parallel lines made from the left fourth bottom intersection point X4 and third pipe fitting deployment lines on the left and right sides of the third center line are Y6 and Y7, intersection points of the parallel lines made from the left fifth bottom intersection point X5 and fourth pipe fitting deployment lines on the left and right sides of the third center line are Y8 and Y9, intersection points of the parallel lines made from the left sixth bottom intersection point X6 and fifth pipe fitting deployment lines on the left and right sides of the third center line are Y10 and Y11, intersection points of the parallel lines made from the left sixth bottom intersection point X7 and sixth bottom intersection points of the left side X12 and the left side and the third bottom deployment lines are Y12; connecting the intersection points Y1-Y13 in sequence by adopting smooth curves to obtain the bottom edge of the first pipe fitting development diagram; similarly, in the same way, parallel lines of a first normal line are made from top intersection points U1-U7 of the top edge of the first pipe fitting and the first bisector to obtain intersection points T1-T13, and the intersection points T1-T13 are connected in sequence by adopting smooth curves to obtain the top edge of the first pipe fitting development diagram;

s11, in the expanded view of the first pipe in the step S10, a parallel line of a first normal line is drawn along an intersection point E1-E7 on a first through-hole line, the parallel line and the first pipe expanded line on the leftmost side form an intersection point F1-F7, and the parallel line and the first pipe expanded line on the rightmost side form an intersection point F1'-F7'; measuring the vertical distance from each division point of 1 '-7' in the second circle to the diameter perpendicular to the second center line in the second circle, translating the length of the vertical distance to the right side of the intersection points F1-F7 in a one-to-one correspondence manner along the parallel line of the first normal line to obtain right shift points of the intersection points F1-F7, translating the length of the vertical distance to the left side of the intersection points F1'-F7' in a one-to-one correspondence manner along the parallel line of the first normal line to obtain left shift points of the intersection points F1'-F7', sequentially connecting the right shift points of the F1-F7 shifted to the right by using a smooth curve, and sequentially connecting the left shift points of the F1'-F7' shifted to the left by using a smooth curve to respectively obtain two half arcs which are two first hole-opening solid sample lines;

s12, in the expanded view of the first pipe fitting in the step S11, parallel lines of a first normal line are made along intersection points E8-E14 on the second through hole line, and the parallel lines respectively form intersection points F8-F14 with a third central line; measuring the vertical distance from each 1'-12' division point in the second circle to the diameter perpendicular to the second center line in the second circle, translating the length of the vertical distance to the left side and the right side of the F8-F14 along the parallel line of the first normal line in a one-to-one correspondence manner, wherein the 7 'division point is overlapped with the intersection point F8 after translation, the 1' division point is overlapped with the intersection point F14 after translation, the translation point distances of the left side and the right side of the rest F9-F13 points are in one-to-one correspondence to the vertical distances from each 2'-6' and 8'-12' division point to the diameter of the second circle, and using a smooth curve to sequentially connect the translation points to obtain a second tapping real sample line;

s13, in the front view of the step S9, making a second pipe expansion diagram: vertically making a second normal line along the second central line, selecting a straight line segment with the same length as the circumference of the second pipe fitting on the second normal line, equally dividing the straight line segment into 12 parts, making a parallel line of the second central line along each division point to obtain a second pipe fitting expansion line, and defining the middle second pipe fitting expansion line as a fourth central line; parallel lines of a second normal line are drawn from the bottom edge of the second pipe and the bottom intersection point of the second bisector, the intersection points of the parallel lines drawn from the rightmost bottom intersection point X1' and the fourth center line are Y1', the intersection points of the parallel lines drawn from the second bottom intersection point X2' on the right side and the first pipe deployment lines on the left and right sides of the fourth center line are Y2' and Y3', respectively, the intersection points of the parallel lines drawn from the third bottom intersection point X3' on the right side and the second pipe deployment lines on the left and right sides of the fourth center line are Y4' and Y5', respectively, the intersection points of the parallel lines drawn from the fourth bottom intersection point X4' on the right side and the third pipe deployment lines on the left and right sides of the fourth center line are Y6' and Y7', respectively, the intersection points of the parallel lines drawn from the fifth bottom intersection point X5' on the right side and the fourth second pipe deployment lines on the left and right sides of the fourth center line are Y8' and Y9', and the intersection points of the parallel lines drawn from the sixth bottom intersection point X6' on the right side and the fifth bottom intersection point and the fourth center line are Y10', respectively, and the fourth bottom line 13', and the fourth bottom intersection point Y7', and the fourth bottom intersection point Y12', respectively; connecting the intersection points Y1'-Y13' in sequence by adopting smooth curves to obtain the bottom edge of the second pipe fitting development picture; similarly, in the same way, parallel lines of a second normal line are made from the top edge of the second pipe fitting and the top intersection points U1'-U7' of the second bisector to obtain intersection points T1'-T13', and the intersection points T1'-T13' are connected in sequence by adopting smooth curves to obtain the top edge of the development drawing of the second pipe fitting.

Preferably, the design unfolding method of the small tool further comprises the following steps:

a1, according to the design and manufacture requirements of the small tool, respectively making a side view and a top view of the small tool, according to a front view in the step S3, projecting downwards to the top view of the small tool along an intersection point of a first bisector of a first pipe and the bottom surface of a bottom plate, taking an intersection point of the projection line and a transverse center line of the bottom plate as a projection point, measuring the vertical distance from each division point 1'-12' in a first circle to the diameter perpendicular to the first center line in the first circle, translating the length of the vertical distance to the upper side and the lower side of the projection point, and obtaining division points G1-G12 in the vertical direction, wherein the division point 7 'is translated and then superposed with G7, the division point 1' is translated and then superposed with G1, and the division points 2'-6', 8'-12' are translated and then respectively corresponded with G2-G6 and G8-G12 one by one; connecting G1-G12 in sequence by adopting a smooth curve to obtain a perforated cross-sectional view of the first pipe fitting on the bottom plate;

a2, according to the front view in the step A1, projecting downwards to the top view of the small-sized tool along the intersection point of the second bisector of the second pipe and the bottom surface of the bottom plate, taking the intersection point of the projection line and the transverse center line of the bottom plate as a projection point, measuring the vertical distance from each divided point 1-12 ' in the second circle to the diameter perpendicular to the second center line in the second circle, translating the length of the vertical distance to the upper side and the lower side of the projection point to obtain division points H1-H12 in the vertical direction, wherein the division point of 7' is overlapped with H1 after translation, the 1' division point is overlapped with H7 after translating, and the other 2' -6' and 8' -12' division points are respectively in one-to-one correspondence with H8-H12 and H2-H6 after translating; connecting H1-H12 in sequence by adopting a smooth curve to obtain a perforated cross-sectional view of the second pipe fitting on the bottom plate;

a3, in the expanded view of the first pipe in the step S10, parallel lines of a first normal line are drawn along the intersection points of the first bisector and the top surface of the bottom plate, the intersection point of a parallel line drawn from the intersection point M1 of the leftmost first bisector and the top surface of the bottom plate and a third center line is N1, the intersection points of a parallel line drawn from the intersection point M2 of the second left first bisector and the top surface of the bottom plate and the first pipe expanded lines on the left and right sides of the third center line are N2 and N3, respectively, the intersection points of a parallel line drawn from the intersection point M3 of the third left first bisector and the top surface of the bottom plate and the second pipe expanded lines on the left and right sides of the third center line are N4 and N5, respectively, the intersection points of the parallel line made from the intersection point M4 of the fourth first bisector on the left side and the top surface of the bottom plate and the third first pipe unfolding lines on the left and right sides of the third center line are respectively N6 and N7, the intersection points of the parallel line made from the intersection point M5 of the fifth first bisector on the left side and the top surface of the bottom plate and the fourth first pipe unfolding lines on the left and right sides of the third center line are respectively N8 and N9, the intersection points of the parallel line made from the intersection point M6 of the sixth first bisector on the left side and the top surface of the bottom plate and the fifth first pipe unfolding lines on the left and right sides of the third center line are respectively N10 and N11, and the intersection points of the parallel line made from the intersection point M7 of the seventh first bisector on the left side and the top surface of the bottom plate and the sixth first pipe unfolding lines on the left and right sides of the third center line are respectively N12 and N13; connecting the intersection points N1-N13 in sequence by adopting smooth curves to obtain the top edge of the first pipe fitting bottom plate mounting line;

a4, according to the front view in the step A3, respectively making parallel lines of a first normal line along intersection points M1'-M7' of the first equal-division line and the bottom surface of the bottom plate in the same manner in the step A3 to obtain intersection points of the parallel lines of the first normal line and corresponding first pipe fitting unfolding lines, wherein the intersection points are N1'-N13', and the intersection points N1'-N13' are sequentially connected by adopting smooth curves to obtain the bottom edge of the first pipe fitting bottom plate mounting line;

a5, in the developed view of the second pipe in the step S13, parallel lines of a second normal line are drawn along the intersection points of the second bisector and the top surface of the bottom plate, Q1 is an intersection point of a parallel line drawn from the intersection point P1 of the rightmost second bisector and the top surface of the bottom plate and the fourth center line, Q2 and Q3 are intersection points of a parallel line drawn from the intersection point P2 of the second bisector on the right side and the top surface of the bottom plate and the first second pipe developed lines on the left and right sides of the fourth center line, Q4 and Q5 are intersection points of a parallel line drawn from the intersection point P3 of the third bisector on the right side and the top surface of the bottom plate and the second pipe developed lines on the left and right sides of the fourth center line, Q6 and Q7 are intersection points of a parallel line drawn from the intersection point P4 of the fourth parallel line on the right side and the top surface of the bottom plate, Q6 and Q7 are intersection points of the parallel lines drawn from the intersection point P5 of the fifth bisector on the right side and the top surface of the bottom plate and the right side, Q6 and Q7 are intersection points of the sixth bisector and the fourth bisector and the right side and the bottom plate developed lines, Q7 are intersection points of the seventh bisector and the right side Q6 and the fourth pipe developed lines Q7 are intersection points of the right side developed from the right side and the fourth bisector and the bottom plate and the intersection points Q6 and the seventh center line, Q7 are respectively; connecting the intersection points Q1-Q13 in sequence by adopting a smooth curve to obtain the top edge of the second pipe fitting bottom plate mounting line;

and A6, according to the front view in the step A5 and in the same manner as in the step A5, taking parallel lines of a second normal line along intersection points P1'-P7' of the second bisector and the bottom surface of the bottom plate to obtain intersection points of the parallel lines of the second normal line and corresponding unfolding lines of the second pipe fitting, wherein the intersection points are Q1'-Q13', and the intersection points Q1'-Q13' are sequentially connected by adopting smooth curves to obtain the bottom edge of the bottom plate mounting line of the second pipe fitting.

Preferably, the projection accuracy of the projection line in the steps S9, A1, and A2 is ± 0.1mm.

Preferably, the precision before and after translation in the above steps S5, S6, S8, S11, S12, A1, A2 is ± 0.3mm.

Preferably, the accuracy of the division in the above steps S2, S3, S10, S13 is ± 0.1mm.

Preferably, the accuracy of the circumferential length in steps S10 and S13 is ± 0.3mm.

As described above, the design deployment method of the small tool of the present invention has the following beneficial effects:

the invention relates to a design and expansion method of a small-sized tool, which is characterized in that a special tool design drawing is drawn through CAD software, and the special tool is expanded by a design lofting and expansion method, so that plate material marking is carried out, through holes are directly cut out in the processes of blanking and cutting, then rolling is carried out, and the special tool is assembled and welded through subsequent operation, so that the precision of penetrating and opening holes of pipes of the small-sized tool is improved, and the production efficiency is improved.

Drawings

FIG. 1 is a front view of a compact tooling of the present invention;

FIG. 2 is a step B2 of the design development method of the small tool of the present invention;

FIG. 3 is a step B3 of the method for designing and expanding the small tool according to the present invention;

FIG. 4 shows a step B4 of the method for designing and deploying a small tool according to the present invention;

FIG. 5 shows the step B5 in the method for designing and unfolding the small tool according to the present invention;

FIG. 6 shows the step B6 in the method for designing and unfolding the small tool according to the present invention;

FIG. 7 is the step B7 in the method for designing and expanding a small tool according to the present invention;

FIG. 8 shows a step B8 in the method for designing and deploying a small tool according to the present invention;

FIG. 9 shows step B9 of the method for designing and deploying a compact tool according to the present invention;

FIG. 10 shows a step B10 in the method for designing and deploying a compact tool according to the present invention;

FIG. 11 is the step B11 in the method for designing and expanding a small tool according to the present invention;

FIG. 12 is a drawing illustrating a step B12 of the method for designing and deploying the small tool according to the present invention;

FIG. 13 is a view showing a step B13 in the method for designing and deploying the small tool according to the present invention;

FIG. 14 is a top view of the compact tooling of the present invention;

FIG. 15 shows the step C1 of the method for designing and deploying a compact tool according to the present invention;

FIG. 16 shows the step C2 of the method for designing and deploying a compact tool according to the present invention;

FIG. 17 shows the step C3 of the method for designing and deploying a compact tool according to the present invention;

FIG. 18 shows the step C4 of the method for designing and deploying a compact tool according to the present invention;

FIG. 19 is the step C5 of the method for designing and deploying a small tool according to the present invention;

FIG. 20 shows the step C6 of the method for designing and deploying a compact tool according to the present invention;

fig. 21 is a left side view of the compact tooling of the present invention.

Description of the element reference numerals

1. A first pipe member;

101. a first bisector line;

102. a first centerline;

103. a first circle;

104. a first through-penetration line;

105. a second through hole line;

2. a second pipe member;

201. a second bisector;

202. a second centerline;

203. a second circle;

204. a first intersecting line;

3. a base plate;

4. a first normal line;

5. a first pipe fitting bottom plate mounting line;

6. a first perforated real sample line;

601. a second open-cell sample line;

7. a first tube deployment line;

701. a third centerline;

8. a second normal line;

9. a second pipe fitting bottom plate mounting line;

10. a second tube deployment line;

1001. a fourth centerline.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the present specification are only used for matching the disclosure and are not used for limiting the practical limitations of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1, the invention provides a small-sized tool for assembling and positioning a product in a ship building process; the small-sized tool mainly comprises a first pipe fitting 1, a second pipe fitting 2 penetrating through the first pipe fitting 1, and a bottom plate 3 penetrating through the first pipe fitting 1 and the second pipe fitting 2. In the embodiment, the diameter of the first pipe fitting 1 is phi 89mm, the diameter of the second pipe fitting 2 is phi 60mm, and since the first pipe fitting 1 and the second pipe fitting 2 are both non-standard parts, a flat plate needs to be selected for rolling, processing and welding, and the second pipe fitting 2 of the small-sized tool needs to penetrate through the first pipe fitting 1, if the first pipe fitting 1 is provided with a through hole after rolling, the precision is not high, the operation steps are complex, and the production efficiency is low; as shown in fig. 1, in the present embodiment, the weld position of the first pipe member 1 is on the right side edge of the first pipe member 1, and the weld position of the second pipe member 2 is on the left side edge of the second pipe member 2.

The invention provides a design unfolding method of a small tool, which is used for directly forming through holes in the process of rolling a flat plate and then performing rolling welding, and can effectively improve the labor efficiency and the precision. Therefore, the first pipe fitting 1 and the second pipe fitting 2 are unfolded by adopting a design unfolding method of a small tool, the position of a through hole in the first pipe fitting 1 is determined, and a flat plate is welded and fixed to the first pipe fitting 1 after being rolled; and then, the flat plate is welded and fixed into the second pipe fitting 2 after being rolled, and the second pipe fitting 2 directly penetrates through the through hole of the first pipe fitting 1 to be welded and fixed, so that the efficiency is improved, and the labor intensity is reduced.

The application relates to a design unfolding method of a small tool, which comprises the following specific steps:

b1, making a front view of the small tool according to the design and manufacturing requirements of the small tool, as shown in figure 1; the design and manufacture requirements of the small tool comprise the height, the diameter and the length of a first pipe fitting 1 and a second pipe fitting 2 in the small tool; height, length of the bottom plate 3.

B2, as shown in fig. 2, in the front view of B1, a first circle 103 is drawn by the diameter Φ 89 of the first pipe member 1, and the first circle 103 is tangent to the extension lines of the two side edges of the first pipe member 1; equally dividing the first circle 103 into 12 parts along the circumference, and marking the division points as 1'-12' respectively; axial extensions of the first tubular part 1 are made along the division points 1'-12', each extending to the top end of the first tubular part 1, said axial extensions being first bisectors 101. Wherein, two division points 1', 7' are tangent points of a first circle 103 and two side extension lines of the first pipe fitting 1, two division points 2', 12' are on the same first equal-division line 101, two division points 3', 11' are on the same first equal-division line 101, two division points 4', 10' are on the same first equal-division line 101, two division points 5', 9' are on the same first equal-division line 101, and two division points 6', 8' are on the same first equal-division line 101. Thus, the first bisectors 101 have seven total, and the two first bisectors 101 on the side overlap the two sides of the first pipe 1.

B3, as shown in fig. 3, in the front view of B2, a second circle 203 is drawn by the diameter Φ 60 of the second pipe 2, and the second circle 203 is tangent to the extension lines of the two side edges of the second pipe 2; equally dividing the second circle 203 into 12 parts along the circumference, and respectively marking the division points as 1'-12'; axial extensions of the second tubular element 2 are made along the respective division points 1"-12", each extending to the top end of the second tubular element 2, said axial extensions being the second bisector 201. Wherein two division points 1 'and 7' are tangent points of the second circle 203 and the extension lines of the two side edges of the second pipe fitting 2, the two cutting points of 2', 12' are on the same second bisector 201, the two cutting points of 3', 11' are on the same second bisector 201, two cutting points of 4 'and 10' are on the same second bisector 201, two cutting points of 5 'and 9' are on the same second bisector 201, the two points of division 6", 8" are on the same second bisector 201. Thus, the second bisectors 201 are seven in total, and the two second bisectors 201 on the side overlap the two sides of the second pipe 2.

B4, as shown in fig. 4, in the front view of B3, a line passing through the center of the first circle 103 in the first bisectors 101 is defined as a first centerline 102, that is, the first bisector 101 where two bisectors 4', 10' are located; a line passing through the center of the second circle 203 in the plurality of second bisectors 201 is defined as a second center line 202, namely, the second bisector 201 where two dividing points of 4 "and 10" are located; the seven first bisectors 101 of the first pipe element 1 intersect with the second centerline 202 of the second pipe element 2, and the seven intersection points are defined as A1-A7 from bottom to top, so that the intersection point of the first centerline 102 and the second centerline 202 is A4.

B5, as shown in fig. 5, in the front view of B4, a vertical line is drawn along the extension line of the second center line 202, seven intersection points A1-A7 are translated onto the extension line of the second center line 202, and the intersection points A4 and the intersection points of the second center line 202 and the vertical line coincide, so that seven intersection points B1-B7 are obtained, wherein the intersection point B4 coincides with the intersection point of the second center line 202 and the vertical line.

B6, as shown in fig. 6, in the front view of B5, respectively, making a vertical line of the second center line 202 along seven intersection points B1-B7, measuring the vertical distance from each division point 1' -12' in the first circle 103 to the diameter perpendicular to the first center line 102 in the first circle 103, and translating the length of the vertical distance to the vertical line of the seven intersection points B1-B7 to obtain twelve points C1-C12, i.e., point C1 is on the extension line of the second center line 202, and the vertical distance between point C2 and the extension line of the second center line 202 is the vertical distance between division point 2' and the diameter of the first circle 103, and so on; connecting twelve points C1-C12 in sequence by adopting a smooth curve to obtain an elliptical section of the first pipe fitting 1; wherein B1 and C1 coincide, and B7 and C7 coincide.

B7, as shown in fig. 7, in the front view of B6, extending the seven second bisectors 201 of the second pipe 2 and penetrating the elliptical cross-section of the first pipe 1 to obtain fourteen intersection points D1-D14; meanwhile, an extension line of the seven bisectors 201 is defined as a first intersecting line 204.

B8, as shown in fig. 8, in the front view of B7, the second central line 202 divides the elliptical cross section of the first pipe 1 into two halves, the elliptical cross section on the right half side of the first central line 102 and the first intersecting line 204 are selected and translated to the top end of the first pipe 1, and then the first central line 102 of the first pipe 1 passes through the center point of the translated elliptical cross section.

B9, as shown in fig. 9, in the front view of B8, the intersection points of the right half and the translated elliptical cross section and the four first intersecting lines 204 are D1 to D8, respectively, the intersection points D1 and D8 are on the top end line of the first pipe fitting 1, and projection lines perpendicular to the top end line of the first pipe fitting 1 are made along six intersection points D2 to D6, so that six projection lines have six projection points with the top end line of the first pipe fitting 1, parallel lines of the first bisector 101 are made along the six projection points and the intersection points D1 and D8, and eight parallel lines intersect with the second bisector 201, respectively. More specifically, the intersection points of the parallel line made from the intersection point D1 and the two outermost second bisectors 201 are E1 and E7, respectively, the intersection points of the parallel line made from the projection point of the intersection point D2 and the right and left second bisectors 201 are E2 and E6, respectively, the intersection points of the parallel line made from the projection point of the intersection point D3 and the right and left third second bisectors 201 are E3 and E5, respectively, and the intersection point of the parallel line made from the projection point of the intersection point D4 and the middle second bisector 201 is E4; similarly, the intersections of the parallel line made from the intersection point D8 and the two outermost second bisectors 201 are respectively E8 and E14, the intersections of the parallel line made from the projection point of the intersection point D7 and the right second bisector 201 and the left second bisector are respectively E9 and E13, the intersections of the parallel line made from the projection point of the intersection point D6 and the right third bisector 201 and the left third bisector are respectively E10 and E12, and the intersections of the parallel line made from the projection point of the intersection point D5 and the middle second bisector 201 are respectively E11. The first through-going hole lines 104 of the first tube 1 are obtained by connecting E1-E7 in sequence using a smooth curve, and the second through-going hole lines 105 of the first tube 1 are obtained by connecting E8-E14 in sequence using a smooth curve.

B10, as shown in fig. 10, in the front view of B9, an expanded view of the first pipe 1 is made, a first normal line 4 is perpendicularly made along the first center line 102, and the expanded circumferential length of the first pipe 1 is calculated by using the formula l = pi (D-1/2t × 2); wherein l: circle developed girth, π: circumference ratio 3.1416, D: major circle outer diameter, t: the thickness of the tube; in the present embodiment, D =89mm, t =5mm, l =3.1416 = (89-1/(2 × 5) = 2) =278.9mm. Selecting a length of 278.9mm on the first normal line 4 and dividing into twelve parts, wherein each part is 23.24mm in length; the first centerline 102 is parallel to the twelve division points of the 278.9mm length, and the first tube deployment lines 7 are obtained, the first tube deployment lines 7 are thirteen, and the middle first tube deployment line 7 is defined as a third centerline 701. Parallel lines of a first normal line 4 are drawn from seven bottom intersection points of the bottom side of the first pipe 1 and the first bisector 101, intersection points of the parallel lines drawn from the leftmost bottom intersection point X1 and the third center line 701 are Y1, intersection points of the parallel lines drawn from the left second bottom intersection point X2 and the first pipe deployment lines 7 on the left and right sides of the third center line 701 are Y2 and Y3, respectively, intersection points of the parallel lines drawn from the left third bottom intersection point X3 and the second pipe deployment lines 7 on the left and right sides of the third center line 701 are Y4 and Y5, intersection points of the parallel lines drawn from the left fourth bottom intersection point X4 and the third pipe deployment lines 7 on the left and right sides of the third center line 701 are Y6 and Y7, intersection points of the parallel lines drawn from the left fifth bottom intersection point X5 and the fourth pipe deployment lines 7 on the left and right sides of the third center line 701 are Y8 and Y9, intersection points of the parallel lines drawn from the left sixth bottom intersection point X6 and the left fifth bottom intersection points of the parallel lines drawn from the left fifth bottom intersection point X5 and the third center line 701 are Y10 and the left bottom intersection points of the seventh bottom line 10 and the third bottom line 701, respectively, and the seventh bottom intersection points of the first pipe deployment lines 701 and Y7 are Y11 and Y7, and Y10, and Y3, respectively, and the left bottom line 10, and the third bottom line 10, and the left side of the third bottom line 10, respectively, and the third bottom line 10, respectively, and the third bottom line 701, and the third bottom line 3, respectively; and sequentially connecting the thirteen intersection points Y1-Y13 by adopting a smooth curve to obtain the bottom edge of the developed view of the first pipe fitting 1. Similarly, in the same way, parallel lines of the first normal line 4 are drawn from the top edge of the first pipe 1 and seven top intersection points U1-U7 of the first bisector 101, specifically: the intersection points of parallel lines from the leftmost top intersection point U1 and the third center line 701 are T1, the intersection points of parallel lines from the second top intersection point U2 on the left side and the first pipe deployment lines 7 on the left and right sides of the third center line 701 are T2 and T3, the intersection points of parallel lines from the third top intersection point U3 on the left side and the second pipe deployment lines 7 on the left and right sides of the third center line 701 are T4 and T5, the intersection points of parallel lines from the fourth top intersection point U4 on the left side and the third first pipe deployment lines 7 on the left and right sides of the third center line 701 are T6 and T7, the intersection points of parallel lines from the fifth top intersection point U5 on the left side and the fourth first pipe deployment lines 7 on the left and right sides of the third center line 701 are T8 and T9, the intersection points of parallel lines from the sixth top intersection point U6 on the left side and the fifth pipe deployment lines 7 on the left and right sides of the third center line 701 are T10 and T11, and the intersection points of parallel lines from the seventh top intersection point U7 on the left side and the third center line 701 are T12, respectively; and sequentially connecting the thirteen top intersection points T1-T13 by adopting a smooth curve to obtain the top edge of the expanded view of the first pipe fitting 1.

B11, as shown in fig. 11, in the developed view of the first tube 1 of B10, seven parallel lines are taken as the parallel lines of the first normal line 4 along the seven points E1 to E7 on the first through-hole line 104, and seven parallel lines are made in total, the seven parallel lines form seven intersection points F1 to F7 with the leftmost developed line 7 of the first tube, and the seven parallel lines form seven intersection points F1 'to F7' with the rightmost developed line 7 of the first tube. Measuring the vertical distance from each division point of 1 '-7' in the second circle 203 to the diameter perpendicular to the second center line 202 in the second circle 203, translating the length of the vertical distance to the right side of the points F1-F7 one by one along the parallel line of the first normal line 4 to obtain the right shift points of the points F1-F7, translating the length of the vertical distance to the left side of the points F1'-F7' one by one along the parallel line of the first normal line 4 to obtain the left shift points of the points F1'-F7', sequentially connecting the seven right shift points of the points F1-F7 which are moved to the right by using a smooth curve, and sequentially connecting the seven left shift points of the points F1'-F7' which are moved to the left by using a smooth curve to respectively obtain two half arcs, thereby obtaining two first open-cell solid sample lines 6; the first tube 1 is rolled along the third centre line 701 so that F1 and F1 'coincide and F7' coincide.

B12, as shown in fig. 12, in the expanded view of the first pipe 1 of B11, seven parallel lines are taken as the parallel lines of the first normal line 4 along the seven points E8 to E14 on the second through hole line 105, and seven parallel lines are in total, and form seven intersection points F8 to F14 with the third center line 701, respectively. Measuring the vertical distance from each division point of 1'-12' in the second circle 203 to the diameter perpendicular to the second center line 202 in the second circle 203, translating the length of the vertical distance along the parallel line of the first normal line 4 to the left and right sides of F8-F14 in a one-to-one correspondence manner, wherein the 7 'division point is coincident with the F8 intersection point after translation, the 1' dividing point is overlapped with the F14 intersection point after translation, the distances of the translation points on the left side and the right side of the rest F9-F13 points correspond to the vertical distances from the 2'-6' and 8'-12' dividing points to the diameter of the second circle 203 one by one, and the twelve translation points are connected in sequence by using a smooth curve to obtain a second hole-opening real sample line 601.

B13, as shown in fig. 13, in the front view of B9, drawing a development of the second tube 2, perpendicularly drawing a second normal line 8 along the second center line 202, and calculating the circumferential length of the second tube 2 by using the formula l = pi (d-1/2t × 2); wherein l: circle developed girth, π: circumference ratio 3.1416, d: small circle outer diameter, t: the thickness of the tube; in the present embodiment, d =60mm, t =5mm, l =3.1416 = (60-1/(2 × 5) × 2) =187.9mm. A length of 187.9mm is selected on the second normal line 8 and divided into twelve equal parts, each part having a length of 15.65mm; the second tube expansion line 10 is obtained by making parallel lines of the second center line 202 along the twelve division points of the length of 187.9mm, the second tube expansion line 10 is thirteen, and the middle second tube expansion line 10 is defined as the fourth center line 1001. Parallel lines of a second normal line 8 are drawn from seven bottom intersection points of the bottom edge of the second pipe 2 and the second bisector 201, the intersection point of the parallel line drawn from the rightmost bottom intersection point X1 'and the fourth center line 1001 is Y1', the intersection points of the parallel line drawn from the second bottom intersection point X2 'on the right side and the first second pipe deployment line 10 on the left and right sides of the fourth center line 1001 are Y2' and Y3', respectively, the intersection points of the parallel line drawn from the third bottom intersection point X3' on the right side and the second pipe deployment line 10 on the left and right sides of the fourth center line 1001 are Y4 'and Y5', respectively, intersection points of parallel lines drawn from a fourth bottom intersection point X4 'on the right side and third pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Y6' and Y7', respectively, intersection points of parallel lines drawn from a fifth bottom intersection point X5' on the right side and fourth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Y8 'and Y9', respectively, intersection points of parallel lines drawn from a sixth bottom intersection point X6 'on the right side and fifth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Y10' and Y11', respectively, and intersection points of parallel lines drawn from a seventh bottom intersection point X7' on the right side and sixth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Y12 'and Y13', respectively; and sequentially connecting the thirteen intersection points Y1'-Y13' by adopting a smooth curve to obtain the bottom edge of the development drawing of the second pipe fitting 2. Similarly, in the same manner, the top edge of the second tube 2 and the seven top intersection points U1' -U7' of the second bisector 201 are parallel lines of the second normal line 8, the intersection points of the parallel lines drawn from the rightmost top intersection point U1' and the fourth centerline 1001 are T1', the intersection points of the parallel lines drawn from the right second top intersection point U2' and the first tube deployment line 10 on the left and right sides of the fourth centerline 1001 are T2' and T3', respectively, the intersection points of the parallel lines drawn from the right third top intersection point U3' and the second tube deployment line 10 on the left and right sides of the fourth centerline 1001 are T4' and T5', the intersection points of the parallel lines drawn from the right fourth top intersection point U4' and the third tube deployment line 10 on the left and right sides of the fourth centerline 1001 are T6' and T7', and the intersection points of the parallel lines drawn from the right fifth top intersection point U5' and the second tube deployment line 10 on the left and right sides of the fourth centerline 1001 are T8' and T9', and the intersection points of the parallel lines drawn from the right fifth top intersection points U5' and the right side 10' and the fourth centerline 1001 are T10', respectively, and the intersection points of the fourth top intersection points 10' and the right side 10', and the sixth centerline 10', and the intersection points 10' are T12, respectively, and the intersection points of the right side of the fourth centerline 1001, and the right side top intersection points 10', and the fourth centerline 10', and the right side 10', and the fourth centerline 10', and the intersection points are T10', respectively, and the intersection points 10', and the right side of the fourth centerline 10', and the intersection points of the intersection points are T2', and the intersection points, respectively; and sequentially connecting the thirteen top intersection points T1'-T13' by adopting a smooth curve to obtain the top edge of the expanded view of the second pipe fitting 2.

Preferably, the method for designing and unfolding the small tool according to the present invention further comprises the steps of:

c1, in the front view of B3, as shown in FIG. 21, making a left view of the small tool; a top view of the small tooling bottom plate 3 is made according to the left side view as shown in fig. 21, as shown in fig. 14; as shown in fig. 15, according to the front view in B3, seven first bisectors 101 of the first pipe 1 are projected downward from the intersection points of the bottom surface of the bottom plate 3, the intersection points of the projection lines and the transverse center line of the bottom plate 3 are projection points, and the total number of the projection points is seven, the vertical distance from each division point 1'-12' in the first circle 103 to the diameter perpendicular to the first center line 102 in the first circle 103 is measured, and the length of the vertical distance is translated to the upper and lower sides of the seven projection points, so that twelve division points G1-G12 are obtained in the vertical direction, wherein the division point 7 'is translated and then coincides with G7, the division point 1' is translated and then coincides with G1, and the division points 2'-6', 8'-12' are translated and then respectively correspond to G2-G6, G8-G12 one by one. And connecting the pipes G1-G12 in sequence by adopting a smooth curve to obtain a perforated cross-sectional view of the first pipe fitting 1 on the bottom plate 3.

C2, as shown in FIG. 16, in the front view of C1, projecting downwards along the intersection point of the seven second bisectors 201 of the second pipe 2 and the bottom surface of the bottom plate 3, the intersection point of the projection line and the transverse center line of the bottom plate 3 is a projection point, the projection points are seven in total, the vertical distance from each divided point 1'-12' in the second circle 203 to the diameter perpendicular to the second center line 202 in the second circle 203 is measured, translating the length of the vertical distance to the upper side and the lower side of the seven projection points to obtain twelve H1-H12 division points in the vertical direction, wherein 7 'division point is overlapped with H1 after translating, 1' division point is overlapped with H7 after translating, and translating the other division points 2'-6' and 8'-12', respectively corresponding to H8-H12 and H2-H6 one by one, and sequentially connecting H1-H12 by adopting a smooth curve to obtain a perforated cross-sectional view of the second pipe fitting 2 on the bottom plate 3.

C3, as shown in FIG. 17, in the front view of B12, the intersection points of the seven first bisectors 101 with the top surface of the bottom plate 3 are parallel lines of the first normal line 4, the intersection point of the parallel line from the intersection point M1 of the leftmost first bisector 101 with the top surface of the bottom plate 3 with the third center line 701 is N1, the intersection points of the parallel line from the intersection point M2 of the second left first bisector 101 with the top surface of the bottom plate 3 with the first pipe expansions 7 on the left and right sides of the third center line 701 are N2 and N3, the intersection points of the parallel line from the intersection point M3 of the third left first bisector 101 with the top surface of the bottom plate 3 with the second pipe expansions 7 on the left and right sides of the third center line 701 are N4 and N5, respectively, the intersection points of the parallel line from the intersection point M4 of the fourth left first bisector 101 with the top surface of the bottom plate 3 with the third pipe expansions 7 on the left and right sides of the third center line 701 are N6 and N7, intersection points of parallel lines drawn from an intersection point M5 of a fifth first bisector 101 on the left side and the top surface of the bottom plate 3 and fourth first pipe deployment lines 7 on the left and right sides of a third center line 701 are respectively N8 and N9, intersection points of parallel lines drawn from an intersection point M6 of a sixth first bisector 101 on the left side and the top surface of the bottom plate 3 and fifth first pipe deployment lines 7 on the left and right sides of the third center line 701 are respectively N10 and N11, intersection points of parallel lines drawn from an intersection point M7 of the seventh first bisector 101 on the left side and the top surface of the bottom plate 3 and sixth first pipe deployment lines 7 on the left and right sides of the third center line 701 are respectively N12 and N13, and thirteen intersection points N1-N13 are sequentially connected by adopting a smooth curve to obtain the top edge of the first pipe bottom plate installation line 5.

C4, as shown in fig. 18, in the front view of C3, in the same manner as in C3, parallel lines of the first normal line 4 are respectively made along the intersection points M1'-M7' of the seven first bisectors 101 and the bottom surface of the bottom plate 3, specifically: the intersection point of the parallel line made from the intersection point M1' of the leftmost first bisector 101 and the bottom surface of the bottom plate 3 with the third center line 701 is N1', the intersection points of the parallel line made from the intersection point M2' of the left second first bisector 101 and the bottom surface of the bottom plate 3 with the first tube deployment line 7 on the left and right sides of the third center line 701 are N2' and N3', respectively, the intersection points of the parallel line made from the intersection point M3' of the left third first bisector 101 and the bottom surface of the bottom plate 3 with the second first tube deployment line 7 on the left and right sides of the third center line 701 are N4' and N5', respectively, the intersection points of the parallel line made from the intersection point M4' of the left fourth first bisector 101 and the bottom surface of the bottom plate 3 with the first tube deployment line 7 on the left and right sides of the third center line 701 are N6' and N7', the intersection points of the parallel line made from the intersection point M5' of the left fifth first bisector 101 and the bottom surface of the bottom plate 3 with the bottom plate 701 are N8' and the intersection points of the sixth bisector 10', and the intersection points of the first bisector 10', and the bottom surface of the bottom plate 3', and the sixth bisector 10', respectively, and the intersection points of the bottom surface of the first tube deployment line 10', and the bottom surface of the bottom plate 701 are N10', and the sixth bisector 10', and the bottom surface of the bottom plate 3', and the bottom surface of the bottom plate 701 ', and the sixth bisector 10', and the bottom surface of the tube deployment line.

C5, as shown in FIG. 19, in the front view of B13, the intersection points of the seven second bisectors 201 with the top surface of the bottom plate 3 are parallel lines of the second normal line 8, the intersection point of the parallel line from the intersection point P1 of the rightmost second bisector 201 with the top surface of the bottom plate 3 and the fourth center line 1001 is Q1, the intersection points of the parallel line from the intersection point P2 of the second bisector 201 on the right side with the top surface of the bottom plate 3 and the first pipe expansion line 10 on the left and right sides of the fourth center line 1001 are Q2 and Q3, respectively, the intersection points of the parallel line from the intersection point P3 of the third bisector 201 on the right side with the top surface of the bottom plate 3 and the second pipe expansion line 10 on the left and right sides of the fourth center line 1001 are Q4 and Q5, respectively, intersection points of parallel lines drawn from an intersection point P4 of a fourth right-side second bisector 201 and the top surface of the bottom plate 3 and third pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Q6 and Q7, respectively, intersection points of parallel lines drawn from an intersection point P5 of a fifth right-side second bisector 201 and the top surface of the bottom plate 3 and fourth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Q8 and Q9, intersection points of parallel lines drawn from an intersection point P6 of the sixth right-side second bisector 201 and the top surface of the bottom plate 3 and fifth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Q10 and Q11, respectively, and intersection points of parallel lines drawn from an intersection point P7 of a seventh right-side second bisector 201 and the top surface of the bottom plate 3 and sixth pipe deployment lines 10 on the left and right sides of the fourth center line 1001 are Q12 and Q13, respectively; and sequentially connecting the thirteen intersection points Q1-Q13 by adopting a smooth curve to obtain the top edge of the second pipe fitting bottom plate mounting line 9.

C6, as shown in FIG. 20, in the front view of C5, in the same manner as in C5, parallel lines of the second normal line 8 are respectively drawn along the intersection points P1'-P7' of the seven second bisectors 201 with the bottom surface of the bottom plate 3, the intersection point of the parallel line drawn from the intersection point P1 'of the rightmost second bisector 201 with the bottom surface of the bottom plate 3 and the fourth center line 1001 is Q1', the intersection points of the parallel line drawn from the intersection point P2 'of the second bisector 201 on the right side with the bottom surface of the bottom plate 3 and the first second pipe deployment line 10 on the left and right sides of the fourth center line 1001 are Q2' and Q3', respectively, the intersection points of the parallel line drawn from the intersection point P3' of the third bisector 201 on the right side with the bottom surface of the bottom plate 3 and the second pipe deployment line 10 on the left and right sides of the fourth center line 1001 are Q4 'and Q5', the intersections of the parallel line drawn from the intersection point P4 'of the fourth right-side second bisector 201 with the bottom surface of the bottom plate 3 with the third second tube deployment lines 10 on the left and right sides of the fourth center line 1001 are Q6' and Q7', respectively, the intersections of the parallel line drawn from the intersection point P5' of the fifth right-side second bisector 201 with the bottom surface of the bottom plate 3 with the fourth second tube deployment lines 10 on the left and right sides of the fourth center line 1001 are Q8 'and Q9', respectively, the intersections of the parallel line drawn from the intersection point P6 'of the sixth right-side second bisector 201 with the bottom surface of the bottom plate 3 with the fifth tube deployment lines 10 on the left and right sides of the fourth center line 1001 are Q10' and Q11', respectively, the intersections of the parallel line drawn from the intersection point P7' of the seventh right-side second bisector 201 with the bottom surface of the bottom plate 3 with the sixth tube deployment lines 10 on the left and right sides of the fourth center line 1001 are Q12 'and Q13', respectively, and thirteen intersections Q1'-Q13' are connected in this order by a smooth curve, the bottom edge of the second tube sheet mounting line 6 is obtained.

Preferably, in this embodiment, the projection accuracy of the projection line is ± 0.1mm, the accuracy before and after translation is ± 0.3mm, the accuracy of the bisection is ± 0.1mm, and the calculation accuracy of the circumferential perimeter is ± 0.3mm.

According to the small tool and the design and development method thereof, an operator firstly draws a front view and a top view of the small tool according to the requirement of installing a positioning device in the ship building process and drawing software, respectively calculates the positions and the sizes of two through holes on a first pipe fitting 1 flat plate, the positions and the sizes of the through holes on a bottom plate 3 of a first pipe fitting 1 and a second pipe fitting 2 and the positions of the top edge and the bottom edge of the first pipe fitting 1 and the second pipe fitting 2 on the bottom plate 3 according to a translation method and a projection method related in the design and development method of the small tool, then selects, cuts, rolls and assembles the first pipe fitting 1, the second pipe fitting 2 and the bottom plate 3 according to the calculated positions, so that the small tool is rapidly manufactured, the production efficiency is improved, and meanwhile, the small tools with various sizes can be manufactured according to the load requirement of the positioning device, and the application range is wide.

Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A design unfolding method of a small tool is characterized by comprising the following steps: the design deployment method sequentially comprises the following steps:

s1, making a front view of a small tool according to design and manufacturing requirements of the small tool, wherein the small tool comprises a first pipe (1), a second pipe (2) penetrating through the first pipe (1), and a bottom plate (3) penetrating through the first pipe (1) and the second pipe (2);

s2, in a front view of the small tool, drawing a first circle (103) by using the diameter of the first pipe fitting (1), wherein the first circle (103) is tangent to an extension line of the side edge of the first pipe fitting (1); equally dividing the first circle (103) into 12 parts along the circumference, and respectively marking the dividing points as 1'-12'; making axial extension lines of the first pipe element (1) along the dividing points, wherein each axial extension line extends to the top end of the first pipe element (1), and the axial extension lines are first equal division lines (101);

s3, drawing a second circle (203) by the diameter of the second pipe fitting (2), wherein the second circle (203) is tangent to an extension line of the side edge of the second pipe fitting (2); equally dividing the second circle (203) into 12 parts along the circumference, and respectively marking the dividing points as 1'-12'; making axial extension lines along the second tube member (2) along the respective division points, each axial extension line extending to the top end of the second tube member (2), said axial extension lines being second bisectors (201);

s4, a line which passes through the center of the first circle (103) in the first bisectors (101) is a first central line (102), and a line which passes through the center of the second circle (203) in the second bisectors (201) is a second central line (202); the intersection points A1-A7 of the first bisectors (101) and the second center line (202) are obtained, wherein the intersection point of the first center line (102) and the second center line (202) is A4;

s5, making a vertical line along the extension line of the second center line (202), translating the intersection points A1-A7 to the extension line of the second center line (202), and enabling the intersection points A4 and the intersection points of the second center line (202) and the vertical line to coincide to obtain intersection points B1-B7;

s6, respectively making a vertical line of a second central line (202) along the intersection points B1-B7, measuring the vertical distance from each division point 1'-12' in the first circle (103) to the diameter perpendicular to the first central line (102) in the first circle (103), and translating the length of the vertical distance to each vertical line of the intersection points B1-B7 to obtain points C1-C12; connecting C1-C12 points in sequence by adopting a smooth curve to obtain an elliptical section of the first pipe fitting (1); wherein B1 and C1 coincide, and B7 and C7 coincide;

s7, extending a second bisector (201) of the second pipe fitting (2) and penetrating the elliptic section of the first pipe fitting (1) to obtain intersection points D1-D14; at the same time, defining the extension of said second bisector (201) as a first intersection line (204);

s8, the second central line (202) divides the elliptical cross section of the first pipe fitting (1) into two halves, the elliptical cross section and the first intersecting line (204) on the right half side of the first central line (102) are selected and translated to the top end of the first pipe fitting (1), and then the first central line (102) of the first pipe fitting (1) penetrates through the center point of the translated elliptical cross section;

s9, the intersection point of the translated elliptical cross section and the first intersecting line (204) is D1-D8, wherein the intersection points D1 and D8 are on the top end line of the first pipe fitting (1), a projection line perpendicular to the top end line of the first pipe fitting (1) is made along the intersection points D2-D6, the projection line of the D2-D6 and the top end line of the first pipe fitting (1) are provided with projection points, parallel lines of the first bisector (101) are made along the projection points and the intersection points D1 and D8, and the parallel lines are respectively intersected with the second bisector (201); wherein, the intersection points of the parallel line made from the intersection point D1 and the two outermost second bisectors (201) are respectively E1 and E7, the intersection points of the parallel line made from the projection point of the intersection point D2 and the right second bisector (201) and the left second bisector are respectively E2 and E6, the intersection points of the parallel line made from the projection point of the intersection point D3 and the right third second bisector (201) and the left third bisector are respectively E3 and E5, and the intersection point of the parallel line made from the projection point of the intersection point D4 and the middle second bisector (201) is E4; similarly, the intersection points of the parallel line made from the intersection point D8 and the two outermost second bisectors (201) are respectively E8 and E14, the intersection points of the parallel line made from the projection point of the intersection point D7 and the right second bisector (201) and the left second bisector are respectively E9 and E13, the intersection points of the parallel line made from the projection point of the intersection point D6 and the right third and left third bisectors (201) are respectively E10 and E12, and the intersection point of the parallel line made from the projection point of the intersection point D5 and the middle second bisector (201) is respectively E11; connecting E1-E7 in sequence by using a smooth curve to obtain a first through-penetrating hole line (104) of the first pipe fitting (1), and connecting E8-E14 in sequence by using a smooth curve to obtain a second through-penetrating hole line (105) of the first pipe fitting (1);

s10, making an expansion drawing of the first pipe fitting (1): vertically making a first normal line (4) along a first central line (102), selecting a straight line section with the same length as the circumference of the first pipe fitting (1) on the first normal line (4), and equally dividing the straight line section into 12 parts; drawing parallel lines of the first central line (102) along the dividing points to obtain a first pipe expansion line (7), and defining the middle first pipe expansion line (7) as a third central line (701); parallel lines of a first normal line (4) are formed at the intersection point of the bottom edge of the first pipe fitting (1) and the bottom of the first equal-dividing line (101), the number of the first equal-dividing lines (101) is seven, and the intersection points of the first equal-dividing lines (101) and the bottom edge of the first pipe fitting (1) are X1-X7 respectively; an intersection point of a parallel line drawn from a leftmost bottom intersection point X1 and a third center line (701) is Y1, intersection points of a parallel line drawn from a second bottom intersection point X2 on the left side and first pipe deployment lines (7) on the left and right sides of the third center line (701) are Y2 and Y3, respectively, intersection points of a parallel line drawn from a third bottom intersection point X3 on the left side and second pipe deployment lines (7) on the left and right sides of the third center line (701) are Y4 and Y5, respectively, intersection points of a parallel line drawn from a fourth bottom intersection point X4 on the left side and third first pipe deployment lines (7) on the left and right sides of the third center line (701) are Y6 and Y7, respectively, the intersection points of the parallel line from the fifth bottom intersection point X5 on the left side and the fourth first pipe unfolding lines (7) on the left and right sides of the third center line (701) are Y8 and Y9 respectively, the intersection points of the parallel line from the sixth bottom intersection point X6 on the left side and the fifth first pipe unfolding lines (7) on the left and right sides of the third center line (701) are Y10 and Y11 respectively, and the intersection points of the parallel line from the seventh bottom intersection point X7 on the left side and the sixth first pipe unfolding lines (7) on the left and right sides of the third center line (701) are Y12 and Y13 respectively; connecting the intersection points Y1-Y13 in sequence by adopting a smooth curve to obtain the bottom edge of the expanded view of the first pipe fitting (1); similarly, in the same way, parallel lines of the first normal line (4) are made from the top edge of the first pipe fitting (1) and the top intersection points U1-U7 of the first equal-dividing line (101) to obtain intersection points T1-T13, and the intersection points T1-T13 are sequentially connected by adopting a smooth curve to obtain the top edge of the expanded view of the first pipe fitting (1);

s11, in the development drawing of the first pipe (1), parallel lines of a first normal line (4) are drawn along intersection points E1-E7 on a first through-penetration line (104), the parallel lines and the first pipe development line (7) on the leftmost side form intersection points F1-F7, and the parallel lines and the first pipe development line (7) on the rightmost side form intersection points F1'-F7'; measuring the vertical distance from each division point of 1 '-7' in the second circle (203) to the diameter perpendicular to the second center line (202) in the second circle (203), translating the length of the vertical distance to the right side of the intersection points F1-F7 in a one-to-one correspondence along the parallel line of the first normal line (4) to obtain right shift points of the intersection points F1-F7, translating the length of the vertical distance to the left side of the intersection points F1'-F7' in a one-to-one correspondence along the parallel line of the first normal line (4) to obtain left shift points of the intersection points F1'-F7', sequentially connecting the right shift points of the F1-F7 to the right using a smooth curve, and sequentially connecting the left shift points of the F1'-F7' to the left using a smooth curve to respectively obtain two half arcs, wherein the two half arcs are two first tapping solid sample lines (6);

s12, in the development drawing of the first pipe fitting (1), parallel lines of the first normal line (4) are made along intersection points E8-E14 on the second through hole line (105), and the parallel lines respectively form intersection points F8-F14 with the third center line (701); measuring the vertical distance from each division point of 1'-12' in the second circle (203) to the diameter which is perpendicular to the second central line (202) in the second circle (203), translating the length of the vertical distance to the left side and the right side of the F8-F14 along the parallel line of the first normal line (4) in a one-to-one correspondence manner, wherein the division point of 7 'is coincident with the intersection point F8 after translation, 1' the segmentation point is overlapped with the intersection point F14 after translation, the distances of the translation points on the left side and the right side of the rest F9-F13 points correspond to the vertical distances from 2'-6' and 8'-12' of the diameters of the segmentation points to the second circle (203), and the translation points are connected in sequence by using a smooth curve to obtain a second hole-opening real sample line (601);

s13, making an expansion drawing of the second pipe fitting (2): vertically drawing a second normal line (8) along the second central line (202), selecting a straight line segment with the same length as the circumference of the second pipe (2) on the second normal line (8), equally dividing the straight line segment into 12 parts, drawing a parallel line of the second central line (202) along each dividing point to obtain a second pipe expansion line (10), and defining the middle second pipe expansion line (10) as a fourth central line (1001); parallel lines of a second normal line (8) are formed at the intersection points of the bottom edges of the second pipe fittings (2) and the bottom parts of the second bisectors (201), the number of the second bisectors (201) is seven, and the intersection points of the second bisectors (201) and the bottom edges of the second pipe fittings (2) are respectively X1'-X7'; intersection points of parallel lines made from a rightmost bottom intersection point X1' and the fourth center line (1001) are Y1', intersection points of parallel lines made from a second bottom intersection point X2' on the right side and the first second pipe deployment line (10) on the left and right sides of the fourth center line (1001) are Y2' and Y3', respectively, intersection points of parallel lines made from a third bottom intersection point X3' on the right side and the second pipe deployment line (10) on the left and right sides of the fourth center line (1001) are Y4' and Y5', intersection points of parallel lines made from a fourth bottom intersection point X4' on the right side and the third second pipe deployment line (10) on the left and right sides of the fourth center line (1001) are Y6' and Y7', intersection points of parallel lines made from a fifth bottom intersection point X5' on the right side and the fourth second pipe deployment line (10) on the left and right sides of the fourth center line (1001) are Y8' and Y9', and intersection points of parallel lines made from a sixth bottom intersection point X6' on the right side and the fourth bottom intersection line X5' on the right side and the fourth center line (10 ' on the right side are Y11', and the fourth bottom deployment line 10', respectively, and the fourth bottom deployment line 10', and the sixth bottom deployment line X12 ', and the right side are Y10', and the fourth bottom deployment line 13', respectively, and the fourth bottom deployment line 13', and the right side, and the fourth bottom deployment line 10', respectively; connecting the intersection points Y1'-Y13' in sequence by adopting smooth curves to obtain the bottom edge of the development of the second pipe fitting (2); similarly, in the same way, parallel lines of a second normal line (8) are made from the top edge of the second pipe (2) and the top intersection points U1'-U7' of the second bisector (201) to obtain intersection points T1'-T13', and the intersection points T1'-T13' are sequentially connected by adopting a smooth curve to obtain the top edge of the development drawing of the second pipe (2).

2. The design development method of the small tool according to claim 1, characterized in that: the steps further include:

a1, according to the design and manufacture requirements of the small tool, respectively making a side view and a top view of the small tool, according to a front view in the step S3, projecting downwards to the top view of the small tool along the intersection point of a first bisector (101) of a first pipe (1) and the bottom surface of a bottom plate (3), taking the intersection point of the projection line and the transverse center line of the bottom plate (3) as a projection point, measuring the vertical distance from each division point 1'-12' in a first circle (103) to the diameter perpendicular to the first center line (102) in the first circle (103), translating the length of the vertical distance to the upper side and the lower side of the projection point, and obtaining division points G1-G12 in the vertical direction, wherein the division point 7 'is translated to coincide with G7, the division point 1' is translated to coincide with G1, and the division points 2'-6', 8'-12' are translated to respectively correspond to G2-G6 and G8-G12 one by one; connecting G1-G12 in sequence by adopting a smooth curve to obtain a perforated cross-sectional view of the first pipe fitting (1) on the bottom plate (3);

a2, according to the front view in the step A1, projecting downwards to the top view of the small-sized tool along the intersection point of the second bisector (201) of the second pipe (2) and the bottom surface of the bottom plate (3), wherein the intersection point of the projection line and the transverse center line of the bottom plate (3) is a projection point, measuring the vertical distance from each division point of 1'-12' in the second circle (203) to the diameter, perpendicular to the second center line (202), in the second circle (203), translating the length of the vertical distance to the upper side and the lower side of the projection point to obtain segmentation points H1-H12 in the vertical direction, wherein the 7 'segmentation point is overlapped with H1 after translation, the 1' segmentation point is overlapped with H7 after translation, and the other 2'-6' segmentation points and the 8'-12' segmentation points are respectively in one-to-one correspondence with H8-H12 and H2-H6 after translation; adopting a smooth curve to connect H1-H12 in sequence to obtain a perforated cross-sectional view of the second pipe fitting (2) on the bottom plate (3);

a3, in the expanded view of the first pipe (1) in the step S10, parallel lines of a first normal line (4) are drawn along the intersection point of the first bisector (101) and the top surface of the bottom plate (3), the intersection point of a parallel line drawn from the intersection point M1 of the leftmost first bisector (101) and the top surface of the bottom plate (3) and the third center line (701) is N1, the intersection points of a parallel line drawn from the intersection point M2 of the left second first bisector (101) and the top surface of the bottom plate (3) and the first pipe expanded lines (7) on the left and right sides of the third center line (701) are N2 and N3, respectively, the intersection points of a parallel line drawn from the intersection point M3 of the left third first bisector (101) and the top surface of the bottom plate (3) and the second pipe expanded lines (7) on the left and right sides of the third center line (701) are N4 and N5, respectively, the intersection points of parallel lines made from the intersection point M4 of the fourth first bisector (101) on the left side and the top surface of the bottom plate (3) and the third first pipe unfolding lines (7) on the left and right sides of the third center line (701) are respectively N6 and N7, the intersection points of parallel lines made from the intersection point M5 of the fifth first bisector (101) on the left side and the top surface of the bottom plate (3) and the fourth first pipe unfolding lines (7) on the left and right sides of the third center line (701) are respectively N8 and N9, and the intersection points of parallel lines made from the intersection point M6 of the sixth first bisector (101) on the left side and the top surface of the bottom plate (3) and the fifth first pipe unfolding lines (7) on the left and right sides of the third center line (701) The intersection points are respectively N10 and N11, and the intersection points of a parallel line made from the intersection point M7 of the seventh first bisector (101) on the left side and the top surface of the bottom plate (3) and the sixth first pipe unfolding lines (7) on the left side and the right side of the third center line (701) are respectively N12 and N13; connecting the intersection points N1-N13 in sequence by adopting smooth curves to obtain the top edge of the first pipe fitting bottom plate mounting line (5);

a4, according to the front view in the step A3, respectively making parallel lines of the first normal line (4) along intersection points M1'-M7' of the first equal-dividing line (101) and the bottom surface of the bottom plate (3) in the same way in the step A3 to obtain intersection points of the parallel lines of the first normal line (4) and corresponding first pipe fitting unfolding lines (7), wherein the intersection points are N1'-N13', and the intersection points N1'-N13' are sequentially connected by adopting smooth curves to obtain the bottom edge of the first pipe fitting bottom plate mounting line (5);

a5, in the developed view of the second pipe (2) in the step S13, a parallel line of a second normal line (8) is drawn along the intersection point of the second bisector (201) with the top surface of the bottom plate (3), Q1 is drawn at the intersection point P1 of the rightmost second bisector (201) with the top surface of the bottom plate (3), Q2 and Q3 are drawn at the intersection point of a parallel line drawn at the intersection point P2 of the rightmost second bisector (201) with the top surface of the bottom plate (3) with the first second pipe (10) on the left and right sides of the fourth center line (1001), Q4 and Q5 are drawn at the intersection point P3 of a parallel line drawn at the intersection point P3 of the right third second bisector (201) with the top surface of the bottom plate (3) with the second pipe (10) on the left and right sides of the fourth center line (1001), Q4 and Q5 are drawn at the intersection point Q6 of the right and the fourth bisector 10 with the bottom surface of the fourth bisector (10) is drawn at the intersection point P4 of the right side of the parallel line drawn at the intersection point P3 with the top surface of the right third bisector (1001), Q6 and Q5 is drawn at the intersection point Q6 and Q6 is drawn at the intersection point Q6 of the right side of the fourth bisector (10 with the bottom plate (10), and the right side of the fourth bisector (3), and the fourth bisector (10) is drawn at the intersection point Q6) The intersection points are respectively Q10 and Q11, and the intersection points of a parallel line drawn from the intersection point P7 of the seventh second bisector (201) on the right side and the top surface of the bottom plate (3) and the sixth second pipe unfolding lines (10) on the left side and the right side of the fourth center line (1001) are respectively Q12 and Q13; connecting the intersection points Q1-Q13 in sequence by adopting a smooth curve to obtain the top edge of the second pipe fitting bottom plate mounting line (9);

and A6, according to the front view in the step A5, in the same way as in the step A5, drawing parallel lines of a second normal line (8) along the intersection points P1'-P7' of the second bisector (201) and the bottom surface of the bottom plate (3), obtaining intersection points of the parallel lines of the second normal line (8) and corresponding second pipe fitting expansion lines (10), wherein the intersection points are Q1'-Q13', and sequentially connecting the intersection points Q1'-Q13' by adopting smooth curves to obtain the bottom edge of the second pipe fitting bottom plate mounting line (9).

3. The design unfolding method of the small tool according to claim 2, characterized in that: the projection accuracy of the projection lines in S9, A1 and A2 is +/-0.1 mm.

4. The design development method of the small tool according to claim 2, characterized in that: the precision before and after translation in S5, S6, S8, S11, S12, A1 and A2 is +/-0.3 mm.

5. The design unfolding method of the small tool according to claim 2, characterized in that: the accuracy of the bisection among S2, S3, S10, S13 is + -0.1 mm.

6. The design development method of the small tool according to claim 2, characterized in that: the circumferential length of S10 and S13 has a precision of. + -. 0.3mm.