How is the manual lofting of the elbow placed

The 90-degree right-angle elbow divides a circle into several segments, and a side view of a 45-degree angle (90 knots of the shrimp waist), and the height of the side view corresponding to the point on the circle is the height of the corresponding point on the figure. The distance between the equal parts of the circle is the width on the figure. Tee take 1 2 right angle elbow is right.

Do the lofting of the elbow by hand.

You can use the program.

It is recommended that you use it. Steel purchase CAD

It's the best way to use it.

1. It needs to be rolled as shown in the figure below, we get the known conditions from the figure: the radius of the middle diameter of the elbow is 300, and the elbow has a total of 4 sections, divided into 15 degrees and 30 degrees, and 30 = 2 * 15.

2. Lofting and marking.

Make rectangular coordinates, take the origin of the coordinates as the center of the circle, and draw 1 4 circles with the radius of the middle diameter of 300 of the elbow.

Then set the center of the circle at the intersection point of the arc and the y-axis in Figure 1, the radius is still 300, and then draw an arc to intersect with the first one.

Take the intersection of the x-axis as the center of the circle, and 159 as the diameter, and draw a semicircle.

3. Divide the semicircle into six equal parts.

Draw an arc with the left, right, and lower three quadrant points of the semicircle as the center of the circle, and 159 2 as the radius, and intersect with the semicircle, and obtain the equinoxate point. And make the perpendicular line of the x-axis with an equal point, and cross the 15-degree ray to obtain 7 line segments of the x-axis 15-degree ray.

4. The diameter of the pipe is 159, the circumference is 159*, considering the reason of the wall thickness of the plate, the diameter of the rolled pipe becomes larger, so the circumference needs to be subtracted from twice the plate thickness, assuming that the plate thickness is 10, so the perimeter becomes a straight line.

As shown in the figure above, we divide the semicircle into sixths, so that the entire circumference will be 12 parts of the length of each part. Transplant the line segments of 1 7 to the bisect point sequentially. and connect the upper endpoints of the segments with smooth curves. The whole drawing is rolled out as a 15-degree elbow.

5. Mirror the 15-degree graphic downward to obtain the shown graph, and roll it into a 30-degree hail leakage elbow. The two whole elbows are welded by two 30 degrees and two 15 degrees.

1. First use a Cartesian ruler to draw the upper right corner of a Cartesian coordinate system that is 90 degrees perpendicular to each other.

<>3, the number of half sections used is 4, then you can divide the equal points on the middle diameter, the number of equal points n = (the number of elbow truncated sections a-1) * 2, here a = 4, so n = 6, draw 6 equal points on the figure, as shown in the figure.

Hollow tube ring volume ='^2))r

r'--The radius of the inner circle of the ring.

The volume of the elbow (elbow) at 90, 60, and 45 degrees is 8 of the volume corresponding to the hollow pipe ring, respectively.

The density of steel is calculated in kilograms cubic decimeters, density x volume = weight (mass).

The elbow is calculated according to the table 2 times, and the 45 ° is calculated according to 1 2; 2. The weight of the elbow is calculated according to Table 2 3; 3. The weight of the wall thickness is not listed in the table, and the average value of two similar weights can be taken ° Elbow calculation formula; where s = wall thickness mm d = outer diameter mm r = bending radius mm

2 90° elbow weight calculation formula: w=

Where: w — 90° elbow weight, kg;

r — radius of curvature of the elbow (structural size), mm;

d — elbow outer diameter, mm;

d — elbow inner diameter, mm.

The specific gravity of carbon steel is used in the elbow weight formula, i.e. calculated.

The weight of the elbow is calculated as 1 2 and 2 times the weight of the 90° elbow, respectively.

3. The formula for calculating the weight of the steel pipe: w=

where: w — the weight of the steel pipe per meter of length, kg m;

t — wall thickness of steel pipe, mm;

d — Outer diameter of steel pipe, mm.

The specific gravity of carbon steel is used in the weight formula of the steel pipe, that is, it is calculated; The weight of austenitic stainless steel pipes is multiple the weight of the above formula.

This is used for automatic loft drawings.

Steel hook CAD is first-class.

First of all, you need to have a plane view angle and size

Elbow: ElbowIn the piping system, the elbow is a pipe fitting that changes the direction of the pipeline. According to the angle, there are 45° and 90°180° three most commonly used, in addition to 60° and other abnormal angle elbows according to the needs of the project. The materials of elbows are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics.

The methods of connection with the pipe are: direct welding (the most commonly used method) flange connection, hot melt connection, electric fusion connection, threaded connection and socket connection.

According to the production process, it can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow, etc. Other names: 90 degree elbow, right angle bend, love and bend, etc.

r--radius of the circle.

r -- the radius of rotation of the ring.

Hollow tube ring volume ='^2))r

r'--The radius of the inner circle of the ring.

The volume of the elbow (elbow) at 90, 60, and 45 degrees is 8 of the volume corresponding to the hollow pipe ring, respectively.

The density of steel is calculated in kilograms cubic decimeters, density x volume = weight (mass).

The elbow is calculated according to the table 2 times, and the 45 ° is calculated according to 1 2; 2. The weight of the elbow is calculated according to the table answer brigade 2 3; 3. The weight of the wall thickness is not listed in the table, and the average value of two similar weights can be taken ° Elbow calculation formula; where s = wall thickness mm d = outer diameter mm r = bending radius mm

2 90° elbow weight hole calculation formula: w=

Where: w — 90° elbow weight, kg;

r — radius of curvature of the elbow (structural size), mm;

d — elbow outer diameter, mm;

d — elbow inner diameter, mm.

The specific gravity of carbon steel is used in the elbow weight formula, i.e. calculated.

The weight of the elbow is calculated as 1 2 and 2 times the weight of the 90° elbow, respectively.

3. The formula for calculating the weight of the steel pipe: w=

where: w — the weight of the steel pipe per meter of length, kg m;

t — wall thickness of steel pipe, mm;

d — Outer diameter of steel pipe, mm.

The specific gravity of carbon steel is used in the weight formula of the steel pipe, that is, the calculation of the trembling stool; The weight of austenitic stainless steel pipes is up.

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This is the best way to use.

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Take a look at the web link, it's very detailed, and you will learn it.

90 degree elbow hand lofting.

The degree elbow can be made into 4 sections of the shrimp waist, can also be made into 5 sections, the principle is the same when hand-lofting, now 3 sections as an example, say about manual lofting.

2. Draw the main view (as shown below).

3. Each section of the waist elbow can be formed into a straight pipe (as shown in the figure below) after torsional alignment, because the first section and the last section are half of the middle section, so only the first section can be.

Turn left|Turn right.

4. Divide the round pipe into 12 equal parts, and lead the equal division line to the cutting line tangent point.

5. Divide the equal parts into 12 equal parts from point 1, draw 12 vertical lines upward, and measure their height from each point of the first section on the left, and intercept them on the corresponding perpendicular line. Smoothly connect the resulting points to complete the diagram.

The most convenient way to stake out is to use software.

Steel CAD can be easily automated in a matter of seconds.

Lofting out of the overall blanking diagram.

Elbow tee size head round place.

It's all like this.

And also synchronously and automatically give the area of the blanking map.

Calculation of elbow material of any degree.

Loft is a complex 3D object that takes a 2D body object as a cross-section along a path. Different bodies can be given to different segments on the same path. We can use staking to build a lot of complex models.

In engineering, it is used to "move" the scheme on the drawing to the actual site.

There's more complex staking than that.

You can use this software.

Steel structure CAD can easily and automatically lofting out the overall blanking drawing in a few seconds.

Tee size head sky round place can be.

It's easy.

The phone is full of bent lofting programs.

Also free nals

Sheet metal patterns are generally lofted by the intersecting line method, and there is no calculation formula. Drawing software is more convenient to draw. The multi-knotted elbow is called the "shrimp waist".

Manual lofting steps: (take one section as an example, the rest of the methods are the same) 1) Draw the side projection of the elbow according to the actual size. Seam lines included.

2) Divide each closed wireframe graphic into an independent graphic by line. (You can crop it or repaint it separately.) 3) Take a pattern, draw it on another piece of paper, draw two horizontal lines parallel to the top and bottom along the height of the pattern, and perpendicular to the center line, the length is exactly the circumference of the diameter of the pattern.

4) Divide the pattern vertically and mark it, and then draw these lines vertically into the rectangle just drawn, noting that the points on the map must correspond to the points on the projection pattern. 5) Divide the upward diagonal line of the drawing in equal directions in the horizontal direction. and pull parallel to the pattern, and correspond to the corresponding point.

The intersection points obtained on the sample are smoothly connected, which is the curve. The denser the aliquot, the more accurate the curve. 6) The amount of the bite is released, and the thickness of the plate is treated.

Elbow cutting must know the bending radius, thickness, and number of sections.

Replace the iron plate with strokes, and the specific operation is as follows:

1. First, use a ruler to draw the upper right area of a Cartesian coordinate system that is 90 degrees perpendicular to each other, as shown in the figure below.

2. Suppose the diameter of the tube we use is 400, then we can determine that the diameter of the tube used is 200, which is drawn in the figure.

3. Assuming that the number of half sections we use is 4, then we can divide the equal points on the middle diameter, the number of equal points n = (the number of elbow sections a-1) * 2, where a = 4, so n = 6, draw 6 equal points on the figure.

4. Then make a semicircle with a radius, divide the semicircle into 6 equal parts, and make a vertical line through these 6 equal points.

5. Then follow the circumference of the round tube and make an equal point, because the figure is symmetrical, you can draw half of it.

6. In the 5th step, the distance of the corresponding projection line on the half-section projection map is cut off on the equal division line, and these interception points are connected into a smooth curve, and then symmetrically folded in half.

Long lc=405;divided into 16 aliquots, each aliquot l1:33; l2：34；l3：

38；l4：43；l5：50；l6：

57；l7：62；l8：66；l9：

67。See picture: Hey, I can't transfer the picture.

For example, in the middle section, L1 and L9 should be measured from the vertical line of the straight line 405 long 16 equal parts to the upper and lower sides, respectively.

Ask the big god big guy to give a set of formulas!! Kneel down and thank you!!

Multiple graphs are used in this reply.

You can see it at a glance.

That's the best.