Ship hull line lofting auxiliary line drawing tool and method

Abstract

The application relates to the technical field of hull line lofting, and discloses a hull line lofting auxiliary line drawing tool, which comprises a fixing frame, a friction piece, a cutter and a transmission mechanism, wherein the friction piece is arranged at the bottom of the fixing frame and is in sliding connection with the fixing frame, the friction piece is used for sliding friction with a line drawing template, the cutter is arranged on the fixing frame and is in sliding connection with the fixing frame, and the transmission mechanism is used for controlling the cutter to slide with the sliding of the friction piece; when the friction piece slides with the line drawing template, the transmission mechanism drives the cutter to slide, and the cutter is used for cutting and line drawing on the line drawing template. The auxiliary line drawing tool is arranged, the cutting gun of a numerical control cutting machine is replaced, high-precision lofting curves can be drawn on the line drawing template by matching the lofting curve diagram, the line drawing equipment does not need to be additionally purchased, the smoothness of the hull plate is ensured, and the cost of hull lofting is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hull line lofting, in particular to a hull line lofting auxiliary line drawing tool and method. BACKGROUND

[0002] In the process of shipbuilding, hull lines need to be lofted, that is, a cross section is made every 0.5m or 0.6m on the hull, the frame lines of each cross section are drawn on the lofting template in a 1:1 ratio to ensure smooth transition between each cross section, and then the skeleton or transverse bulkhead of the ship is made according to the frame lines.

[0003] Currently, there are two ways to draw hull lofting curves, one is manual lofting, which uses a kind of plate auxiliary line drawing tool and line drawing method disclosed in the invention patent with publication number CN112025667A to draw hull lofting curves during operation, but the labor intensity is relatively large, and in actual processing, the operation of the operator is not standardized and the lofting precision of the line is not enough, which affects the smoothness of the hull line; the other is mathematical lofting, which uses a computer to establish a three-dimensional numerical model of the hull, converts the three-dimensional numerical model into a plane curve graph, and then uses a numerical control line drawing device to draw lines, which requires more equipment and increases the lofting cost of the hull line.

[0004] In addition, in the above two lofting methods, the lofting curve line type is not uniform, that is, the curves at different positions may have different thicknesses, which makes it difficult to align the workpiece with the lofting curve, also reduces the processing precision of the workpiece, and affects the smoothness of the hull plate. SUMMARY

[0005] Therefore, the present application provides a hull line lofting auxiliary line drawing tool and method, which can draw high-precision lofting curves using existing processing equipment and ensure the smoothness of the hull plate.

[0006] The technical scheme of the present application is as follows: on the one hand, the present application provides a hull line lofting auxiliary line drawing tool, which comprises a fixing frame, a friction piece, a cutter and a transmission mechanism, wherein,

[0007] The friction piece is arranged at the bottom of the fixing frame and is in sliding connection with the fixing frame, and the friction piece is used for friction sliding with the lofting template;

[0008] The cutter is arranged on the fixing frame and is in sliding connection with the fixing frame;

[0009] The transmission mechanism is used for controlling the sliding of the cutter along with the sliding of the friction member, and when the friction member is in friction sliding with the line drawing template, the transmission mechanism drives the cutter to slide, so that the cutter cuts and draws lines on the line drawing template.

[0010] On the basis of the above technical scheme, preferably, the transmission mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein,

[0011] The first connecting rod is fixedly arranged at the top of the friction member, and the first connecting rod, the second connecting rod and the third connecting rod are slidingly arranged on the fixed frame, and the fourth connecting rod is fixedly arranged at the top end of the cutter;

[0012] The sliding direction of the first connecting rod and the third connecting rod is the same as the sliding direction of the friction member, and is perpendicular to the sliding direction of the second connecting rod and the cutter;

[0013] Both ends of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are in an inclined shape, and the end portions of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are in turn in abutment with each other.

[0014] Further preferably, the inclination angle of both ends of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod is 45 degrees.

[0015] Further preferably, a tension spring is further included, and both ends of the tension spring are fixedly arranged in the fixed frame and at the top of the fourth connecting rod, respectively.

[0016] Further preferably, a limiting plate is fixedly arranged on the friction member.

[0017] A limiting bolt is arranged on the fixed frame, the limiting bolt is connected with the fixed frame through thread cooperation, the limiting bolt is located on the side of the limiting plate away from the cutter, and the front end of the limiting bolt is in abutment with the limiting plate when the friction member is in friction sliding with the line drawing template.

[0018] Further preferably, an abutment plate is further included, the abutment plate is fixedly arranged at the bottom of the fixed frame, the abutment plate is located below the cutter, and a cutting line hole for passing through the cutter is formed in the abutment plate.

[0019] Further preferably, the end of the abutment plate away from the friction member is in an upwardly curved shape.

[0020] Further preferably, the cutting line hole is in a conical shape, and the inner diameter of the upper end of the cutting line hole is greater than the inner diameter of the lower end of the cutting line hole.

[0021] The upper side of the abutting plate is integrally formed with a material distributing part near one end of the friction part, and the other end of the material distributing part is tapered.

[0022] In another aspect, the application also provides a hull line lofting method using the above-mentioned hull line lofting auxiliary line drawing tool, comprising the following steps:

[0023] S1, a three-dimensional software is used to create a hull data model, the data model is unfolded to generate a two-dimensional lofting curve graph, one of the end points of each lofting curve is selected and designated as a first fixed point, a cutting line is drawn on the side of the first fixed point away from the lofting curve with the first fixed point as the starting point, and the other end point of the cutting line is a second fixed point;

[0024] S2, the cutting gun on the moving arm of the numerical control cutting machine is removed, and the fixing frame is installed on the moving arm;

[0025] S3, the two-dimensional lofting curve graph is imported into the numerical control cutting machine, and the line drawing template is fixed on the machining table surface of the numerical control cutting machine;

[0026] S4, the limiting bolt is rotated to adjust the sliding distance of the friction part;

[0027] S5, the moving arm of the numerical control cutting machine is moved, the cutter is moved above one of the second fixed points, and then the moving arm is moved downward, so that the friction part abuts against the line drawing template;

[0028] S6, the moving arm of the numerical control cutting machine is driven to move along the path of the lofting curve, and the cutter is driven to draw lines on the surface of the line drawing template;

[0029] S7, steps S5-S7 are repeated until the line drawing operation of all lofting curves is completed, and the score consistent with the shape of the two-dimensional lofting curve graph is formed.

[0030] On the basis of the above technical scheme, preferably, the depth of the score is 0.3mm, and the width is 2mm.

[0031] The hull line lofting auxiliary line drawing tool and method of the application have the following beneficial effects compared with the prior art:

[0032] (1) By setting the auxiliary line drawing tool, the cutting gun of the numerical control cutting machine is replaced, and high-precision lofting curves can be drawn on the line drawing template in cooperation with the lofting curve graph, without the need to purchase line drawing equipment, which not only ensures the smoothness of the hull plate, but also reduces the cost of hull lofting;

[0033] (2) By setting limit bolts to limit the sliding length of the friction parts, the sliding distance of the cutter can be adjusted, thereby controlling the depth and width of the groove, realizing the uniformity of the loft curve line shape, and improving the accuracy of the hull processing;

[0034] (3) By setting up a material distribution section and a conical tangent hole, the cut material residue can be removed from the groove, ensuring the clarity of the groove. By using the groove instead of drawing, the lofting curve can also be prevented from being smeared, thus ensuring the smooth progress of the hull processing.

[0035] (4) By limiting the depth and width of the scratches, it is also possible to prevent the scratches from affecting the structural strength of the scribing template, so that the scribing template can be cut and used after layout, thus realizing the reuse of the workpiece. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a perspective view of the bottom of the hull line layout auxiliary drawing tool of the present invention;

[0038] Figure 2 This is a perspective view of the top of the hull line layout auxiliary drawing tool of the present invention;

[0039] Figure 3 This is a schematic diagram of the internal structure of the hull line layout auxiliary drawing tool cutter of the present invention in the state where the cutter has not passed through the tangent hole;

[0040] Figure 4 This is a schematic diagram of the internal structure of the hull line layout auxiliary drawing tool cutter of the present invention with the cutter passing through the tangent hole.

[0041] Figure 5 This is a perspective view of the abutment plate in the hull line layout auxiliary drawing tool of the present invention;

[0042] Figure 6 This is a schematic diagram of the cutting line in the hull line layout method of the present invention.

[0043] The components are: 1. Fixing frame; 11. Limiting bolt; 2. Friction component; 21. Limiting plate; 3. Supporting plate; 31. Material distribution section; 301. Cutting hole; 4. Cutting blade; 5. Transmission mechanism; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod; 54. Fourth connecting rod; 6. Tension spring; 7. Cutting line; 71. First fixed point; 72. Second fixed point. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0045] As shown in the drawings, the hull line lofting auxiliary line drawing tool of the present application comprises a fixing frame 1, a friction member 2, a cutter 4 and a transmission mechanism 5. Figures 1-6 The fixing frame 1 is used to be fixed with the moving arm of the numerical control cutting machine, and after the cutting gun head of the numerical control cutting machine is replaced, the fixing frame 1 can move along with the path of the lofting curve by cooperating with the movement of the moving arm. The numerical control cutting machine is a necessary processing equipment in ship body processing.

[0046] The friction member 2 is the driving mechanism of the cutter 4, and the friction member 2 is located at the bottom of the fixing frame 1 and is in sliding connection with the fixing frame 1. When the line drawing operation is performed, the friction member 2 slides with the friction of the line drawing template, as shown in the drawings, the friction member 2 slides left and right relative to the fixing frame 1. In order to improve the friction effect and structural strength of the friction member 2, the friction member 2 can be made of ceramic material.

[0047] The cutter 4 is used to generate a notch on the line drawing template, and the cutter 4 is arranged on the fixing frame 1 and is in sliding connection with the fixing frame 1. The cutter 4 uses the notch to replace the original drawing method for line drawing operation, and also makes the lofting curve on the line drawing template not easy to be erased, thereby ensuring the smooth progress of the ship body processing. Figure 1 The transmission mechanism 5 is used to control the cutter 4 to slide with the sliding of the friction member 2. When the friction member 2 slides with the friction of the line drawing template, the transmission mechanism 5 drives the cutter 4 to slide, so that the cutter 4 cuts and draws lines on the line drawing template to form a notch on the line drawing template, which is consistent with the shape of the lofting curve. In this line drawing operation process, the existing numerical control cutting machine can be used to complete the high-precision line drawing operation, without the need to purchase corresponding line drawing equipment, thereby greatly reducing the cost of ship body lofting.

[0048]

[0049] The transmission mechanism 5 is used to control the cutter 4 to slide with the sliding of the friction member 2. When the friction member 2 slides with the friction of the line drawing template, the transmission mechanism 5 drives the cutter 4 to slide, so that the cutter 4 cuts and draws lines on the line drawing template to form a notch on the line drawing template, which is consistent with the shape of the lofting curve. In this line drawing operation process, the existing numerical control cutting machine can be used to complete the high-precision line drawing operation, without the need to purchase corresponding line drawing equipment, thereby greatly reducing the cost of ship body lofting.

[0050] ​As a preferred embodiment, the transmission mechanism 5 comprises a first connecting rod 51, a second connecting rod 52, a third connecting rod 53 and a fourth connecting rod 54, wherein the first connecting rod 51 is fixedly arranged at the top of the friction piece 2, and the first connecting rod 51, the second connecting rod 52 and the third connecting rod 53 are all slidingly arranged on the fixed frame 1, and the fourth connecting rod 54 is fixedly arranged at the top end of the cutter 4; the sliding direction of the first connecting rod 51 and the third connecting rod 53 is the same as the sliding direction of the friction piece 2, and is perpendicular to the sliding direction of the second connecting rod 52 and the cutter 4; the two ends of the first connecting rod 51, the second connecting rod 52, the third connecting rod 53 and the fourth connecting rod 54 are all inclined, and the end portions of the first connecting rod 51, the second connecting rod 52, the third connecting rod 53 and the fourth connecting rod 54 are in turn in abutment with each other; as shown in Figure 3 , the left end of the first connecting rod 51 at the top of the friction piece 2 is in abutment with the lower end of the second connecting rod 52, the upper end of the second connecting rod 52 is in abutment with the left end of the third connecting rod 53, and the right end of the third connecting rod 53 is in abutment with the left end of the fourth connecting rod 54; when the numerical control cutting machine drives the fixed frame 1 to move to the right, as shown in Figure 4 , the friction piece 2 is made to move to the left by the friction sliding of the friction piece 2 and the line drawing template, so as to drive the left end of the first connecting rod 51 to push the second connecting rod 52 upward, the third connecting rod 53 is pushed to the right by the extrusion of the upper end of the second connecting rod 52, and the fourth connecting rod 54 and the cutter 4 are made to move downward, so that the cutter 4 passes through the tangent hole 301, and the cutter 4 is made to cut and draw lines on the line drawing template by cooperating with the movement of the fixed frame 1; specifically, in order to guarantee that the end faces of the first connecting rod 51, the second connecting rod 52, the third connecting rod 53 and the fourth connecting rod 54 are in abutment, and improve the stability of the transmission mechanism 5, the inclination angles of the two ends of the first connecting rod 51, the second connecting rod 52, the third connecting rod 53 and the fourth connecting rod 54 are preferably set to 45 degrees.

[0051] Further, in order to prevent the cutter 4 from passing through the tangent hole 301 in the idle state, and improve the use convenience of the tooling, a tension spring 6 can also be arranged, and the two ends of the tension spring 6 are fixedly arranged in the fixed frame 1 and at the top of the fourth connecting rod 54 respectively, as shown in Figure 3 , when the cutter 4 is in the idle state, the cutter 4 can be lifted upward by the pulling of the upper end of the fourth connecting rod 54 by the tension spring 6.

[0052] Further, a limiting plate 21 can also be fixedly arranged on the friction piece 2, and a limiting bolt 11 is arranged on the fixed frame 1, the limiting bolt 11 is connected with the fixed frame 1 through threaded cooperation, and the limiting bolt 11 is located on the side of the limiting plate 21 away from the cutter 4, as shown in Figure 4As shown, when the friction member 2 is in frictional sliding with the line drawing template, the front end of the limiting bolt 11 abuts against the limiting plate 21. When the limiting bolt 11 is rotated to move rightward, the slidable distance of the friction member 2 can be reduced, so as to shorten the moving distance of the cutter 4 downward, and correspondingly, the depth and width of the score line are reduced. On the contrary, when the limiting bolt 11 is rotated to move leftward, the slidable distance of the friction member 2 can be increased, so as to lengthen the moving distance of the cutter 4 downward, and correspondingly, the depth and width of the score line are increased, so as to realize the control of the score line type.

[0053] Optionally, the abutting plate 3 can be further arranged, which is fixedly arranged at the bottom of the fixed frame 1 and located below the cutter 4. The abutting plate 3 is used for abutting against the line drawing template, so as to make the line drawing template more flat. The abutting plate 3 is provided with a cutting line hole 301 for the cutter 4 to pass through. When the cutter 4 is moved downward by the friction member 2 and the transmission mechanism 5, the cutter 4 can pass through the cutting line hole 301, so as to prevent the abutting plate 3 from hindering the sliding of the cutter 4.

[0054] Further, in order to ensure the smooth sliding of the abutting plate 3 and prevent the front end of the sliding direction from being damaged, the end of the abutting plate 3 away from the friction member 2 can be arranged in an upward bending shape, as shown in Figure 3 When the device moves rightward, the right end of the abutting plate 3 is upwardly bent and does not contact the line drawing template, so as to prevent the impurities on the line drawing template from hindering the movement of the abutting plate 3 and prevent the right end of the abutting plate 3 from being damaged.

[0055] Further, in order to avoid the material slag cut by the cutter 4 from being accumulated in the score line or the burrs generated on both sides of the score line, the cutting line hole 301 can be further arranged in a tapered shape, and the inner diameter of the upper end of the cutting line hole 301 is greater than the inner diameter of the lower end of the cutting line hole 301, as shown in Figure 5 When the abutting plate 3 moves, the material slag in the cutting line hole 301 can be discharged along the inclined side wall of the cutting line hole 301. In order to prevent the discharged material slag from entering the bottom of the friction member 2, a material distribution part 31 can be integrally formed on the upper side of the abutting plate 3 close to the end of the friction member 2, the end of the material distribution part 31 away from the friction member 2 is in a tapered shape, and the discharged material slag is discharged along the two sides.

[0056] The ship body line lofting auxiliary line drawing tool and the ship body line lofting method thereof have the following advantages.

[0057] S1, a three-dimensional software is used to create a ship body data model, and the data model is unfolded to generate a two-dimensional lofting curve diagram, as shown in Figure 6As shown, one of the endpoints of each lofting curve is selected and designated as a first fixed point 71, and a cutting line 7 is drawn from the first fixed point 71 on the side of the first fixed point 71 away from the lofting curve, with the other endpoint of the cutting line 7 being a second fixed point 72; since there is a transition process of the frictional sliding of the frictional member 2 and the line drawing template, i.e. the falling process of the cutter 4, in this process, the width and depth of the notch generated by the cutter 4 on the line drawing template are not uniform, and in order to ensure the uniformity of the width and depth of the notch on the lofting curve, the cutter 4 can be first operated for a certain distance outside the lofting curve, i.e. the path of the cutting line 7, and the falling process of the cutter 4 is completed in the path of the cutting line 7;

[0058] S2, remove the cutting gun on the moving arm of the numerical control cutting machine, and install the fixed frame 1 on the moving arm;

[0059] S3, import the two-dimensional lofting curve graph into the numerical control cutting machine, and fix the line drawing template on the machining table surface of the numerical control cutting machine;

[0060] S4, rotate the limiting bolt 11 to adjust the sliding distance of the frictional member 2, so that the width and depth of the notch meet the design requirements;

[0061] S5, move the moving arm of the numerical control cutting machine, move the cutter 4 above one of the second fixed points 72, and then move the moving arm downward to make the frictional member 2 abut against the line drawing template;

[0062] S6, drive the moving arm of the numerical control cutting machine to move along the path of the lofting curve, and drive the cutter 4 to draw lines on the surface of the line drawing template;

[0063] S7, S5-S7 can realize the drawing of one lofting curve, and the steps S5-S6 are repeated until the line drawing operation of all lofting curves is completed, so as to form a notch consistent with the shape of the two-dimensional lofting curve.

[0064] As a preferred embodiment, the depth of the generated notch is preferably 0.3 mm, and the width is preferably 2 mm. The notch of this size can not only ensure the clarity of the notch and facilitate the alignment operation of the workpiece, but also will not damage the structural strength of the line drawing template, so as to cut and reuse the line drawing template after the hull is machined.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A hull line lofting auxiliary line drawing tool, characterized in that: Including fixed frame (1), friction piece (2), cutting knife (4) and transmission mechanism (5), wherein, The friction piece (2) is arranged at the bottom of the fixed frame (1) and is in sliding connection with the fixed frame (1), and the friction piece (2) is used for sliding friction with the line drawing template; The cutting knife (4) is arranged on the fixed frame (1) and is in sliding connection with the fixed frame (1); The transmission mechanism (5) is used for controlling the cutting knife (4) to slide with the sliding of the friction piece (2), and when the friction piece (2) slides friction with the line drawing template, the transmission mechanism (5) drives the cutting knife (4) to slide, so that the cutting knife (4) cuts and draws lines on the line drawing template; The transmission mechanism (5) includes first connecting rod (51), second connecting rod (52), third connecting rod (53) and fourth connecting rod (54), wherein the first connecting rod (51) is fixedly arranged at the top of the friction piece (2), and the first connecting rod (51), the second connecting rod (52) and the third connecting rod (53) are all arranged in sliding mode on the fixed frame (1), and the fourth connecting rod (54) is fixedly arranged at the top end of the cutting knife (4); the sliding directions of the first connecting rod (51) and the third connecting rod (53) are the same as the sliding direction of the friction piece (2), and are perpendicular to the sliding directions of the second connecting rod (52) and the cutting knife (4); both ends of the first connecting rod (51), the second connecting rod (52), the third connecting rod (53) and the fourth connecting rod (54) are in inclined shape, and the end portions of the first connecting rod (51), the second connecting rod (52), the third connecting rod (53) and the fourth connecting rod (54) are in turn in abutting mode.

2. The hull line lofting auxiliary line drawing tool according to claim 1, characterized in that: The inclination angles of both ends of the first connecting rod (51), the second connecting rod (52), the third connecting rod (53) and the fourth connecting rod (54) are 45 degrees.

3. The hull line lofting auxiliary line drawing tool according to claim 2, wherein: Further comprising a tension spring (6), both ends of the tension spring (6) are fixedly arranged in the fixed frame (1) and at the top of the fourth connecting rod (54) respectively.

4. The hull line lofting auxiliary line drawing tool according to claim 3, wherein: The friction piece (2) is fixedly provided with a limiting plate (21); The fixed frame (1) is provided with a limiting bolt (11), the limiting bolt (11) is connected with the fixed frame (1) through thread cooperation, the limiting bolt (11) is located on the side of the limiting plate (21) away from the cutting knife (4), and when the friction piece (2) slides friction with the line drawing template, the front end of the limiting bolt (11) abuts against the limiting plate (21).

5. The hull line lofting auxiliary line drawing tool according to claim 4, wherein: Further comprising an abutting plate (3), the abutting plate (3) is fixedly arranged at the bottom of the fixed frame (1), the abutting plate (3) is located below the cutting knife (4), and a cutting line hole (301) for passing through the cutting knife (4) is formed in the abutting plate (3).

6. The hull line lofting auxiliary line drawing tool according to claim 5, wherein: The end of the abutting plate (3) away from the friction piece (2) is in upward bending shape.

7. The hull line lofting auxiliary line drawing tool according to claim 6, wherein: The cutting line hole (301) is in conical shape, and the inner diameter of the upper end of the cutting line hole (301) is greater than the inner diameter of the lower end of the cutting line hole (301); The resisting plate (3) is integrally formed with a material distribution part (31) on the upper side of one end close to the friction part (2), and the end of the material distribution part (31) away from the friction part (2) is in a conical shape.

8. A method of lofting ship lines using the ship line lofting aid of claim 7, wherein, The method comprises the following steps: S1, a three-dimensional software is used to create a hull data model, the data model is unfolded to generate a two-dimensional lofting curve graph, one of the end points of each lofting curve is selected and designated as a first fixed point (71), a cutting line (7) is drawn on the side of the first fixed point (71) away from the lofting curve with the first fixed point (71) as the starting point, and one of the two end points of the cutting line (7) far away from the first fixed point (71) is a second fixed point (72); S2, the cutting gun on the moving arm of the numerical control cutting machine is removed, and the fixed frame (1) is installed on the moving arm; S3, the two-dimensional lofting curve graph is imported into the numerical control cutting machine, and the line drawing template is fixed on the machining table surface of the numerical control cutting machine; S4, the limiting bolt (11) is rotated to adjust the sliding distance of the friction part (2); S5, the moving arm of the numerical control cutting machine is moved, the cutter (4) is moved above one of the second fixed points (72), and then the moving arm is moved downward, so that the friction part (2) abuts against the line drawing template; S6, the moving arm of the numerical control cutting machine is driven to move along the path of the lofting curve, and the cutter (4) is driven to draw lines on the surface of the line drawing template; S7, steps S5-S7 are repeated until the line drawing operation of all lofting curves is completed, and the scratch in the shape consistent with the two-dimensional lofting curve graph is formed.

9. The method of lofting ship lines of any one of claims 8, wherein: The depth of the scratch is 0.3mm, and the width is 2mm.

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