CN109931899B

CN109931899B - Flange face machining allowance detection method

Info

Publication number: CN109931899B
Application number: CN201910148259.3A
Authority: CN
Inventors: 冯露; 孟康杰; 艾燎原
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2021-04-13
Anticipated expiration: 2039-02-28
Also published as: CN109931899A

Abstract

The invention discloses a method for detecting the machining allowance of a flange surface, and relates to the technical field of machining measurementAnd the middle stay bar and the flange are respectively positioned at two ends of the I-shaped steel, the I-shaped steel and the flange are symmetrically arranged along the central plane of the front stay bar, and the flange surface is a surface of the flange parallel to the length direction of the I-shaped steel. The method for detecting the machining allowance of the flange surface in the embodiment of the invention comprises the steps of firstly determining any point on the flange surface as a reference point, taking any point except the reference point on the flange surface as a reference point, and then according to the machining allowance in the distance direction between the reference point and the central plane and the reference point and the central plane ZX₀The machining allowance of the flange surface is determined from the machining allowance in the distance direction, so that the dependence on a scribing platform is eliminated, and the flange surface can directly pass through a central plane ZX on the front support rod without the scribing platform₀The machining allowance of the flange surface is determined, and the detection efficiency is improved.

Description

Flange face machining allowance detection method

Technical Field

The invention relates to the technical field of machining measurement, in particular to a method for detecting machining allowance of a flange surface.

Background

Slewing bearing cranes are the most common marine lifting devices in platform cranes. The steel wire rope amplitude-variable truss arm support crane is a main type of a slewing bearing type crane and comprises four structures, namely a foundation column, a rotary table, an A-shaped frame and an arm support. The A-shaped frame is a supporting structure consisting of a front supporting rod, a rear pulling rod, a hinged supporting beam, a pin shaft part and the like.

Fig. 1 is a front view of a front stay, and as shown in fig. 1, the front stay 100 includes a middle stay 110, an i-beam 120, and a flange 130, and the middle stay 110 and the flange 130 are respectively located at both ends of the i-beam 120. FIG. 2 is a top view of the front stay 100, and as shown in FIG. 2, the I-steel 120 and the flange 130 are both along a center plane ZX of the front stay 100₀The left I-steel 121 and the right I-steel 122 are symmetrically arranged, and in order to make the front stay 100 more stable in force bearing, the central plane ZX of the left I-steel 121 is in the Z-axis projection direction, namely an XY plane₁And the center plane ZX of the right I-beam 122₂Respectively with the front stay center plane ZX₀The included angle of (a) is alpha. The flange 130 comprises a left flange 131 connected to the left i-beam 121 and a right flange 132 connected to the right i-beam 122, and the flange surface is the surface of the flange 130 parallel to the length direction of the i-beam 120. FIG. 3 is a sectional view taken along line F-F of FIG. 2 of the present embodiment, as shown in FIG. 3, for holding the front stayThe continuity of the stress transmission of (1) is that on the X-axis projection direction, i.e. the YZ plane, the center line YX of the left I-beam 121₁And the center line YX of the right I-beam 122₂Respectively with the front stay center plane ZX₀The included angle of (b) is beta.

In the conventional part processing, a workpiece is generally placed on a scribing platform, a theoretical distance is marked on the workpiece through a scribing line by taking the scribing platform as a reference, and the processing allowance is determined through the distance between a surface to be processed and the scribing line.

Because the flange surface and the central plane ZX of the front brace rod₀There are two compound spatial angles (alpha and beta), which results in that the front stay bar cannot be directly placed on the scribing platform to be scribed to determine the machining allowance in the scribing process. Therefore, various auxiliary supporting tools need to be manufactured to fix the flange surface to be processed in parallel to the scribing platform, and the processing allowance of the flange surface is determined by a conventional method.

During the scribing of the flange face of the flange 130, the inventors found that the prior art has at least the following problems:

because need make multiple auxiliary stay frock, it is fixed to be on a parallel with the marking off platform with the flange face of treating processing, consequently to the requirement of auxiliary stay frock precision very high. And the high-precision auxiliary support tool is complex in processing technology and long in manufacturing period, so that the detection process is long in time consumption.

Disclosure of Invention

In order to solve the problem that the machining allowance of a part with a composite space angle is not easy to determine through scribing of a scribing platform, the embodiment of the invention provides a method for detecting the machining allowance of a flange surface. The technical scheme is as follows:

in a first aspect, a method for detecting machining allowance of a flange surface is provided, wherein a front support rod comprises a middle support rod, I-shaped steel and a flange, the middle support rod and the flange are respectively located at two ends of the I-shaped steel, the I-shaped steel and the flange are symmetrically arranged along the central plane of the front support rod, the flange surface is a surface of the flange parallel to the length direction of the I-shaped steel, and the method for detecting the machining allowance of the flange surface comprises the following steps:

determining a datum point, wherein the datum point is any point on the flange surface;

determining a first machining allowance of the reference point, wherein the first machining allowance is a machining allowance in the distance direction between the reference point and the central plane;

determining a second machining allowance of a reference point, wherein the reference point is any point on the flange surface except the reference point, and the second machining allowance is the machining allowance in the distance direction between the reference point and the central surface;

and determining the machining allowance of the flange surface according to the first machining allowance of the datum point and the second machining allowance of the reference point.

Further, determining the first machining allowance of the reference point includes:

obtaining a first parameter L_{0 side}First parameter L_{0 side}Is a measure of the distance of the reference point from the central plane;

obtaining a second parameter L_{Theory of action}Second parameter L_{Theory of action}A theoretical value of the distance from the reference point to the central plane;

according to a first parameter L_{0 side}And a second parameter L_{Theory of action}Obtaining a first machining allowance Delta L₀。

Further, a first parameter L is obtained_{0 side}Calculated by the following formula:

wherein L is_{0J measurement}The positioning point is the intersection point of the perpendicular line passing through the central plane of the reference point and the central plane of the I-shaped steel on the same side of the reference point, and the central plane of the I-shaped steel is the central plane perpendicular to the cross section of the I-shaped steel; first measurement distance

Is a measure of the length of a perpendicular to the flange face through the locating point in the direction of the perpendicular from the locating point to the centre plane.

Further, the first measured distance

Calculated by the following formula:

H_{0 side}The measured value of the distance from the positioning point to the flange surface is obtained; alpha is the included angle between the central plane of the I-steel and the central plane on the XY plane; beta is the included angle between the central line of the I-steel and the central plane on the YZ plane.

Further, a second parameter L_{Theory of action}Calculated by the following formula:

wherein L is_{0J theory}The positioning point is a theoretical value of the distance from the positioning point to a central plane, the positioning point is an intersection point of a perpendicular line passing through the central plane of the reference point and the central plane of the I-shaped steel on the same side of the reference point, and the central plane of the I-shaped steel is a central plane perpendicular to the cross section of the I-shaped steel; second distance

Is a theoretical value of the length of a perpendicular line passing through the flange face of the positioning point in the direction of the perpendicular line from the positioning point to the center plane.

Further, determining a second machining allowance of the reference point includes:

obtaining a third parameter L_{n measurement}Third parameter L_{n measurement}Is a measured value of the distance from the reference point to the central plane;

obtaining a fourth parameter L_{n is}Fourth parameter L_{n is}The theoretical value of the distance from the reference point to the central plane;

according to a third parameter L_{n measurement}And a fourth parameter L_{n is}Obtaining a second machining allowance Delta L_n。

Further, three parameters L are obtained_{n measurement}Calculated by the following formula:

wherein the first parameter L_{0 side}Is a measure of the distance of the reference point from the central plane; second measured distance

The distance between the reference point and the reference point is measured according to the component of the length direction of the I-shaped steel on the same side of the reference point in the direction of the perpendicular line from the reference point to the central plane, and the third measurement distance

The distance between the reference point and the reference point is measured along the component of the connecting line of the reference point and the reference point along the direction of the central line of the I-shaped steel section on the same side of the reference point in the direction of the perpendicular line from the reference point to the central plane.

Further, the second measured distance

Calculated by the following formula:

wherein R is_MeasuringA measure of the length of the reference point and reference point connection;

gamma is an included angle between a connecting line of the reference point and the length direction of the I-shaped steel on the same side of the reference point;

alpha is the included angle between the central plane of the I-shaped steel and the central plane on the XY plane.

Further, a third measured distance

Obtained by

Wherein R is_MeasuringMeasured values that are reference points and fiducial points;

beta is the included angle between the central plane of the I-steel and the central plane on the YZ plane

Alpha is the included angle between the central line of the I-steel and the central plane on the XY plane.

Further, a fourth parameter L is obtained_{n is}The method can be realized by the following steps:

wherein the second parameter L_{Theory of action}A theoretical value of the distance from the reference point to the central plane; second theoretical distance +_{2 in the theory of}The theoretical value of the distance of the component of the connecting line of the reference point and the reference point along the length direction of the I-shaped steel on the same side of the reference point in the direction of the perpendicular line from the reference point to the central plane, and the third theoretical distance

The theoretical value of the distance of the component of the connecting line of the reference point and the reference point along the central line direction of the I-shaped steel section on the same side of the reference point in the direction of the perpendicular line from the reference point to the central plane.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

the front stay bar in the embodiment of the invention comprises a middle stay bar, I-shaped steel and a flange, wherein the middle stay bar and the flange are respectively positioned at two ends of the I-shaped steel, and the I-shaped steel and the flange are both arranged along the central plane ZX of the front stay bar₀The flanges are symmetrically arranged, and the flange surfaces are surfaces of the flanges parallel to the length direction of the I-shaped steel. The method for detecting the machining allowance of the flange surface in the embodiment of the invention comprises the steps of firstly determining any point on the flange surface as a reference point, taking any point except the reference point on the flange surface as a reference point, and then according to the reference point and a central plane ZX₀Machining allowance and reference point in distance direction and center plane ZX₀The machining allowance of the flange surface is determined from the machining allowance in the distance direction, so that the dependence on a scribing platform is eliminated, and the flange surface can directly pass through a central plane ZX on the front support rod without the scribing platform₀The machining allowance of the flange surface is determined, and the detection efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a front view of a front stay of the type;

FIG. 2 is a top view of the front stay;

FIG. 3 is a sectional view taken along line F-F of FIG. 2 according to the present embodiment;

fig. 4 is a flowchart of a method for detecting a remaining amount of a flange machined surface according to an embodiment of the present invention;

fig. 5 is a flowchart of a method for detecting a remaining amount of a flange machined surface according to an embodiment of the present invention;

FIG. 6 is an enlarged view of the embodiment shown in FIG. 2 at I;

FIG. 7 shows a distance H from an anchor point to a flange surface according to an embodiment of the present invention_{0 side}A schematic projection of (a);

fig. 8 is a schematic projection diagram of a distance H' from a positioning point to a flange surface according to an embodiment of the present invention;

FIG. 9 is a schematic illustration of the components of the distance from a reference point on the flange face to a reference point along different directions;

FIG. 10 shows the component of the measured distance between the reference point and the reference point along the length direction of the I-beam at the reference point O₁To the central plane ZX₀A projection schematic view of the perpendicular direction of (a);

FIG. 11 is a schematic projection diagram of a component of a measured distance between a reference point and a reference point along the central line direction of the cross section of the I-beam in the XY plane perpendicular to the length direction of the I-beam;

fig. 12 is a schematic view of a projection length in the XY plane perpendicular to the longitudinal direction of the i-beam projected in the direction of the perpendicular from the reference point to the center plane.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For a clearer understanding of the present solution, the structure of the stay bar is briefly described here.

Fig. 1 is a front view of a front stay, as shown in fig. 1, the front stay 100 includes a middle stay 110, an i-beam 120, and a flange 130, the middle stay 110 and the flange 130 are respectively located at two ends of the i-beam 120, fig. 2 is a top view of the front stay 100, as shown in fig. 2, the i-beam 120 and the flange 130 are both along a central plane ZX of the front stay 100₀Are symmetrically arranged. As shown in fig. 1 and 2, the bottom surface, center plane ZX of the center stay 110₀And the side surfaces of the middle stay bar 110 connected with the I-shaped steel are vertical pairwise. In the following description, the X-axis is perpendicular to the side of the center stay 110 connected to the I-beam, and the Y-axis is perpendicular to the center plane ZX₀And the Z-axis is perpendicular to the bottom surface of the middle brace 110. The h-beam 120 includes a left h-beam 121 and a right h-beam 122, and in order to make the front stay 100 more stable in bearing force, the center plane ZX of the left h-beam 121 is located on the Z-axis projection direction, i.e. the XY plane₁And the center plane ZX of the right I-beam 122₂Respectively with the front stay center plane ZX₀The included angle of (a) is alpha. The flange 130 comprises a left flange 131 connected to the left i-beam 121 and a right flange 132 connected to the right i-beam 122, and the flange surface is the surface of the flange 130 parallel to the length direction of the i-beam 120. FIG. 3 is a sectional view taken along line F-F of FIG. 2 of this embodiment, and as shown in FIG. 3, the center line YX of the left I-beam 121 is located along the YZ plane in the X-axis projection direction to maintain the continuity of the front stay during force transmission₁And the center line YX of the right I-beam 122₂Respectively with the front stay center plane ZX₀The included angle of (b) is beta.

Fig. 4 is a flowchart of a method for detecting a remaining amount of a flange machined surface according to an embodiment of the present invention, and as shown in fig. 4, the method for detecting a remaining amount of a flange machined surface according to the present invention includes:

s101, reference points are any point on the flange surface;

s102, determining a first machining allowance of the reference point, wherein the first machining allowance is the reference point and a central plane (ZX)₀) Machining allowance in the distance direction;

s103, determining a second machining allowance of a reference point, wherein the reference point is any point on the flange surface except the reference point, and the second machining allowance is the reference point and a central plane ZX₀Machining allowance in the distance direction;

and S104, determining the machining allowance of the flange surface according to the first machining allowance of the datum point and the second machining allowance of the reference point.

The method for detecting the machining allowance of the flange surface in the embodiment of the invention comprises the steps of firstly determining any point on the flange surface as a reference point, taking any point except the reference point on the flange surface as a reference point, and then according to the reference point and a central plane ZX₀Machining allowance and reference point in distance direction and center plane ZX₀The machining allowance of the flange surface is determined from the machining allowance in the distance direction, so that the dependence on a scribing platform is eliminated, and the flange surface can directly pass through a central plane ZX on the front support rod without the scribing platform₀The machining allowance of the flange surface is determined, and the detection efficiency is improved.

In this embodiment, the inner surface of the left flange 131 of the front stay 100 is described as an example of a flange surface to be processed, and the method for detecting the machining allowance of the flange surface of the front stay may be used to detect the machining allowance of any flange surface of the front stay, and is not limited to the inner surface of the left flange 131 of the front stay.

Fig. 5 is a flowchart of a method for detecting a remaining amount of a flange machined surface according to an embodiment of the present invention; as shown in fig. 5, the method for detecting the allowance of the flange machined surface comprises the following steps:

s201, determining a reference point, wherein the reference point is any point on the flange surface.

The datum point may be any point on the flange face. Alternatively, the datum point may be the geometric center point of the flange face, so that the location of the datum point is easier to markAnd (4) determining. Fig. 6 is an enlarged view of the position I of fig. 2 in the embodiment, and as shown in fig. 6, since the left flange 131 in the embodiment of the present invention is circular, the center O of the inner surface of the left flange 131 can be selected₁As a reference point.

S202, obtaining a first parameter L_{0 side}First parameter L_{0 side}Is a reference point O₁To the central plane ZX₀Is measured.

Referring to fig. 2, a center a of an end surface of a left side h-beam 121 and a center B of an end surface of a right side h-beam 122 of the front stay 100 are taken as references, a tooling plate is fixed between the left side h-beam 121 and the right side h-beam 122, and a midpoint of a connecting line between the center a of a cross section of the left side h-beam 121 and the center B of a cross section of the right side h-beam 122 is O_ABThrough O_ABAnd the center line O of the middle stay 110_CDetermining the center plane ZX of the front brace 100₀。

One implementation of this embodiment, as shown in fig. 6, may be at the center O of the inner side surface of the left flange 131₁And the center O of the inner side surface of the right flange 132₂Between which a tooling plate is fixed through O₁And O₂Is connected with the central plane ZX of the front stay 100₀Determining the first parameter L_{0 side}Reference point O₁To the central plane ZX₀The measured distance of (a).

In another implementation manner of this embodiment, the first parameter L_{0 side}Can be calculated by the following formula:

wherein L is_{0J measurement}For anchor point J to centre plane ZX₀Is measured, the positioning point J is a passing reference point O₁Central plane ZX of₀Perpendicular line of (A) and reference point O₁Homonymy I-steel central plane ZX₁Cross point of, i-steel central plane ZX₁Is perpendicular to the central plane of the cross section of the I-shaped steel; first measurement distance

Is perpendicular to the flange surface passing through the positioning point J at the positioning point O₁To the central plane ZX₀A length in the perpendicular direction.

L_{0 side}And L_{0J measurement}Are all along the positioning point O₁To the central plane (ZX)₀) Length in the perpendicular direction, measurement value H of the distance from the positioning point J to the flange surface_{0 side}Is the length in the direction perpendicular to the flange face. Therefore, a measurement value H of the distance from the anchor point J to the flange face is required_{0 side}And performing projection transformation.

The positioning point J may be determined by a tool fixed between the left inner and outer flanges, or optionally, the central plane ZX of the left i-beam 121 may be determined by the central point a of the end surface of the left i-beam 121₁. Then passes along the reference point O₁To the central plane ZX₀The vertical line direction of the center plane ZX is fixed between the tooling plate and the left inner flange and the left outer flange₁Determining the intersection line of the positioning points J, wherein the midpoint of the intersection line is the positioning point J.

Because the positioning point J is the central plane ZX of the left I-steel₁Point of (c), determining a first parameter L by means of the anchor point J_{0 side}Can avoid the flange center and the left I-steel central plane ZX caused by the welding error of the flange₁The effect of misalignment.

In one implementation of this embodiment, the first measurement distance is

Calculated by the following formula:

H_{0 side}The measured value of the distance from the positioning point J to the flange surface is obtained; alpha is on XY plane, I-steel central plane ZX₁With the central plane ZX₀The included angle of (A); beta is on YZ plane, I-steel central line YX₁With the central plane ZX₀The included angle of (a).

In determining the distance of the locating point J from the flange faceMeasured value H_{0 side}In time, the distance can be translated to the flange surface through the tool for measurement. Optionally, due to the edge of the reference point O₁To the central plane ZX₀The vertical line direction of the center plane ZX is fixed between the tooling plate and the left inner flange and the left outer flange₁The intersection line of (a) is parallel to the flange face, therefore, the distance from the intersection line to the flange end face is the measured value H of the distance from the positioning point J to the flange face_{0 side}。

FIG. 7 shows a distance H from an anchor point J to a flange surface according to an embodiment of the present invention_{0 side}Is shown in the drawing. As shown in FIG. 7, since the distance from the positioning point J to the flange face is measured as the length in the direction perpendicular to the flange face, it is compared with the reference point O₁To the central plane (ZX)₀) Has an angle β with respect to the vertical line direction in the YZ plane, and thus has H ═ H_{0 side}×cos β。

Fig. 8 is a schematic diagram of projection variation of a distance H' from the intersection point J to the inner end surface of the left flange, which is generated by the deflection angle α according to the embodiment of the present invention. As shown in FIG. 8, since the measurement value of the distance from the positioning point J to the flange face is the length in the direction perpendicular to the flange face, it is compared with the reference point O₁To the central plane (ZX)₀) Has an angle alpha on the XY plane, thus, has

By measuring the distance L, as already given in the design drawings for the inclination angles alpha and beta_{OJ test}And H_{0 side}The first parameter L may be obtained_{0 side}。

S203, obtaining a second parameter L_{Theory of action}Second parameter L_{Theory of action}Is a reference point O₁To the central plane ZX₀Is measured.

In one implementation manner of this embodiment, the second parameter L_{Theory of action}Calculated by the following formula:

wherein, as shown in FIG. 6, L_{0J theory}For anchor point J to centre plane ZX₀The positioning point J is a passing reference point O₁Central plane ZX of₀Perpendicular line of (A) and reference point O₁Homonymy I-steel central plane ZX₁Cross point of, i-steel central plane ZX₁Is perpendicular to the central plane of the cross section of the I-shaped steel; second distance

Is perpendicular to the flange surface passing through the positioning point J at the positioning point O₁To the central plane ZX₀A theoretical value of the length in the perpendicular direction.

Similarly, when implemented, the first theoretical distance

Calculated by the following formula:

H_{0 side}The theoretical value of the distance from the positioning point J to the flange surface is obtained; alpha is on XY plane, I-steel central plane ZX₁With the central plane ZX₀The included angle of (A); beta is on YZ plane, I-steel central line YX₁With the central plane ZX₀The included angle of (a).

First theoretical distance

Is derived from the previous first measured distance

The derivation process is consistent and will not be described again. Due to the inclination angles alpha, beta and L_{Theory of things}And L_{J theory of labor}Given in the design drawing, the second parameter L can be obtained by calculation_{Theory of action}。

S204, according to the first parameter L_{0 side}And a second parameter L_{Theory of action}Obtaining a first machining allowance Delta L₀。

Alternatively, rootAccording to the first parameter L_{0 side}And a second parameter L_{Theory of action}To obtain a working allowance DeltaL₀The method comprises the following steps:

when the first parameter L_{0 side}Not more than the second parameter L_{Theory of action}While, the machining allowance Δ L₀Is zero;

when the first parameter L_{0 side}>Second parameter L_{Theory of action}While, the machining allowance Δ L₀Is a first parameter L_{0 side}And a second parameter L_{Theory of action}The difference of (a).

When the first parameter L_{0 side}Is equal to the second parameter L_{Theory of action}Then, the reference point O is shown₁The measured value of (d) coincides with the theoretical value, the machining allowance Delta L₀Is zero;

when the first parameter L_{0 side}Less than the second parameter L_{Theory of action}Then, the reference point O is shown₁No margin is required to be processed, and the processing margin DeltaL₀Is zero;

when the first parameter L_{0 side}Greater than a second parameter L_{Theory of action}Then, the reference point O is shown₁The allowance is needed to be processed, and the processing allowance delta L₀Is a first parameter L_{0 side}And a second parameter L_{Theory of action}The difference of (a).

S205, obtaining a third parameter L_{n measurement}Third parameter L_{n measurement}As reference point N to the central plane ZX₀A measure of distance.

Reference point N to reference point O on the flange face of FIG. 9₁Is shown in fig. 9, the reference point N is the datum point O on the flange surface₁At any point except for any point, when the machining allowance of the reference point N on the flange surface needs to be calculated, the method can further comprise the following steps:

obtaining a reference point N and a reference point O₁The included angle gamma between the connecting line of the left I-shaped steel and the length direction of the left I-shaped steel;

obtaining a reference point N and a reference point O₁Distance R of_Measuring。

According to the angle gamma and the distance R_MeasuringCalculating reference points N to and reference point O₁Component Lx of the connecting line along the length direction of the I-beam and the central line YX along the section of the left I-beam 121₁The component Ly of the direction (see fig. 3). From reference point N to reference point O₁The measured distance of the left side I-beam 121 can be resolved, and the component Lx along the length direction of the I-beam and the central line YX along the section of the left side I-beam can be more conveniently obtained₁The component Ly of the direction being at the reference point O₁To the central plane ZX₀In the direction of the perpendicular.

In one implementation manner of this embodiment, the third parameter L_{n measurement}Calculated by the following formula:

wherein the first parameter L_{0 side}Is a reference point O₁To the central plane ZX₀A measure of the distance of (d); second measured distance

As reference point N and reference point O₁The component of the connecting line along the length direction of the I-shaped steel at the same side of the datum point is at the datum point O₁To the central plane ZX₀A measured value of the distance in the perpendicular direction of (A), a third measured distance

As reference point N and reference point O₁The component of the connecting line along the central line direction of the I-shaped steel section on the same side of the datum point is on the datum point O₁To the central plane ZX₀A measured value of the distance in the direction of the perpendicular.

FIG. 10 shows reference point N and reference point O₁Is measured along the component L of the length direction of the I-steel_XAt reference point O₁To the central plane ZX₀The projection diagram of the vertical line direction of the optical fiber is realized,

calculated by the following formula:

wherein R is_MeasuringAs reference point N and reference point O₁A measure of the length of the link of (a);

gamma is reference point N and reference point O₁The included angle between the connecting line of the left I-shaped steel and the length direction of the left I-shaped steel is formed;

alpha is on XY plane, left I-steel central plane ZX₁With the front stay central plane ZX₀The included angle of (A);

as shown in fig. 10, due to L_XIs along the length direction of the left I-steel, on the XY plane, the central plane ZX of the left I-steel₁With the front stay central plane ZX₀Is alpha, so that, during the angle change, it is at the reference point O₁To the central plane ZX₀Measured value of the distance in the direction of the perpendicular

FIG. 11 shows reference point N and reference point O₁Along the center line YX of the section of the left I-beam 121₁The projection of the directional component Ly in the length direction of the i-steel.

In one implementation manner of the present embodiment,

calculated by the following formula:

wherein R is_MeasuringAs reference point N and reference point O₁A measured value of (a);

beta is on YZ plane, I-steel central line YX₁With the front stay central plane ZX₀Angle of (2)

Alpha is in the XY plane in the I-steelHeart surface ZX₁With the front stay central plane ZX₀The included angle of (a).

As shown in FIGS. 3 and 11, the component Ly is a center line YX along the cross-section of the left I-beam 121₁The component Ly of the direction is the center line YX of the cross section of the left I-beam 121 on the YZ plane₁Direction and front stay center plane ZX₀Is beta, and the length of the projection of the left I-beam 131 in the XY plane perpendicular to the length direction

Fig. 12 is a schematic projection view of a projection length in the XY plane perpendicular to the longitudinal direction of the left side i-beam in the perpendicular direction from the reference point to the center plane. As shown in fig. 12, the center plane ZX of the left side i-beam 131 is on the XY plane₁With the geometrical centre plane ZX of the front stay₀Is alpha, so that, during the angle change, it is at the reference point O₁To the central plane ZX₀Measured value of the distance in the direction of the perpendicular

S206, obtaining a fourth parameter L_{n is}Fourth parameter L_{n is}As reference point N to the central plane ZX₀A measure of distance.

In one implementation manner of this embodiment, the fourth parameter L_{n is}The method can be realized by the following steps:

wherein the second parameter L_{Theory of action}Is a reference point O₁To the central plane ZX₀A theoretical value of the distance of (a); second theoretical distance

As reference point N and reference point O₁Is along the reference point O₁The length direction component of the I-shaped steel on the same side is on the referencePoint O₁To the central plane ZX₀A theoretical value of the distance in the perpendicular direction of (a), a third theoretical distance

As reference point N and reference point O₁Is along the reference point O₁The component of the I-shaped steel section at the same side in the center line direction is at the reference point O₁To the central plane ZX₀Is a theoretical value of the distance in the perpendicular direction.

Similarly, when implemented, the second theoretical distance

Calculated by the following formula:

wherein R is_{Theory of things}As reference point N and reference point O₁The theoretical value of (A);

alpha is on XY plane, I-steel central plane ZX₁With the front stay central plane ZX₀The included angle of (A);

third theoretical distance

Obtained by the following method:

obtained by

gamma is reference point N and reference point O₁Is connected with the left sideThe included angle of the I-shaped steel in the length direction;

beta is on YZ plane, the left I-steel central line YX₁With the front stay central plane ZX₀Angle of (2)

Alpha is on XY plane, left I-steel central plane ZX₁With the front stay central plane ZX₀The included angle of (a).

Second theoretical distance

And a third theoretical distance

Derivation of the distance from the previous first measurement

And

the derivation process is consistent and will not be described again. Due to the inclination angles alpha, beta, gamma and R_{Theory of things}Given in the design drawing, the fourth parameter L can be obtained by calculation_{n is}。

S207, according to the third parameter L_{n measurement}And a fourth parameter L_{n is}Obtaining a second machining allowance Delta L_n。

Optionally according to a third parameter L_{n measurement}And a fourth parameter L_{n is}To obtain a working allowance DeltaL_nThe method comprises the following steps:

when the third parameter L_{n measurement}Not more than a fourth parameter L_{n is}While, the machining allowance Δ L_nIs zero;

when the third parameter L_{n measurement}>Fourth parameter L_{n is}While, the machining allowance Δ L_nIs a third parameter L_{n measurement}And a fourth parameter L_{n is}The difference of (a).

When the third parameter L_{n measurement}Is equal to the fourth parameter L_{n is}When the measured value of the reference point N is consistent with the theoretical value, the machining allowance Delta L_nIs zero;

when the third parameterL_{n measurement}Less than the fourth parameter L_{n is}When the reference point N has no margin and needs to be processed, the processing margin Delta L_nIs zero;

when the third parameter L_{n measurement}Greater than a fourth parameter L_{n is}When the reference point N has a margin to be processed, the processing margin delta L_nIs a third parameter L_{n measurement}And a fourth parameter L_{n is}The difference of (a).

S208, according to the reference point O₁First machining allowance Δ L of₀And a second machining allowance DeltaL of a reference point N_nAnd determining the machining allowance of the flange surface.

In practice, the reference point N may be chosen as many points as desired.

In one implementation, the reference point may be selected to be the highest point N of the plane_HAnd a lowest point N_L. Conceivably, the highest point N of the plane_HAnd a lowest point N_LCan be determined by measuring the flatness of the flange face.

In another implementation, reference point O may be used₁For the center of a circle, 4 reference points are selected at intervals of 90 degrees on a reference line with the radius of R1. The number of reference points may also be increased by different radii.

Optionally, reference point O₁The first machining allowance and the second machining allowances of the multiple reference points N are averaged and determined as the machining allowances of the flange surface.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides a flange face machining allowance detection method, preceding vaulting pole (100) are including middle vaulting pole (110), I-steel (120) and flange (130), middle vaulting pole (110) with flange (130) are located respectively the both ends of I-steel (120), I-steel (120) with flange (130) are all followed the central plane ZX of preceding vaulting pole (100)₀Symmetrically arranged, the flange face is the flange (130)) The flange face machining allowance detection method is characterized in that the surface parallel to the length direction of the I-shaped steel (120) comprises the following steps:

determining a reference point, wherein the reference point is any point on the flange surface;

obtaining a first parameter L_{0 side}The first parameter L_{0 side}For the reference point to the central plane ZX₀A measure of the distance of (d);

obtaining a second parameter L_{Theory of action}Said second parameter L_{Theory of action}For the reference point to the central plane ZX₀A theoretical value of the distance of (a);

according to the first parameter L_{0 side}And a second parameter L_{Theory of action}Obtaining a first machining allowance Delta L₀The first machining allowance is the reference point and the central plane ZX₀Machining allowance in the distance direction;

obtaining a third parameter L_{n measurement}Said third parameter L_{n measurement}As a reference point to said central plane ZX₀A measurement of distance;

obtaining a fourth parameter L_{n is}Said fourth parameter L_{n is}For said reference point to said central plane ZX₀A theoretical value of distance;

according to the third parameter L_{n measurement}And the fourth parameter L_{n is}Obtaining a second machining allowance Delta L_nThe reference point is any point on the flange surface except the reference point, and the second machining allowance is the reference point and the central plane ZX₀Machining allowance in the distance direction;

2. The method for detecting the machining allowance of the flange surface according to claim 1, wherein a first parameter L is obtained_{0 side}Calculated by the following formula:

L_{0 side}＝L_{0J measurement}-▽_{1 measurement}；

Wherein L is_{0J measurement}For locating points to said centre plane ZX₀The location point being the central plane ZX passing through the reference point₀The vertical line of the reference point is the intersection point of the central plane of the I-shaped steel on the same side of the reference point, and the central plane of the I-shaped steel is the central plane vertical to the cross section of the I-shaped steel; first measurement distance +_{1 measurement}Is a perpendicular line passing through the flange surface of the positioning point from the positioning point to the center plane ZX₀A length in the perpendicular direction.

3. The method for detecting the machining allowance of the flange face according to claim 2, wherein the first measurement distance ∑ is_{1 measurement}Calculated by the following formula:

▽_{1 measurement}＝H_{0 side}×cosα×cosβ

H_{0 side}Measuring the distance between the positioning point and the flange surface; alpha is on XY plane, the central plane of the I-steel and the central plane ZX₀The included angle of (A); beta is on YZ plane, I-steel central line and the central plane ZX₀The included angle of (a).

4. The method for detecting the machining allowance of the flange surface according to claim 1, wherein the second parameter L is_{Theory of action}Calculated by the following formula:

L_{theory of action}＝L_{0J theory}-▽_{1 in principle}；

Wherein L is_{0J theory}For locating points to said centre plane ZX₀The positioning point is the center plane ZX passing through the reference point₀The vertical line of the reference point is the intersection point of the central plane of the I-shaped steel on the same side of the reference point, and the central plane of the I-shaped steel is the central plane vertical to the cross section of the I-shaped steel; second distance +_{1 in principle}Is a perpendicular line passing through the flange surface of the positioning point from the positioning point to the center plane ZX₀A theoretical value of the length in the perpendicular direction.

5. A flange face allowance of claim 4Detection method, characterized in that said third parameter L is obtained_{n measurement}Calculated by the following formula:

L_{n measurement}＝L_{0 side}+▽_{2 measurement of}+▽_{3 measurement of}；

Wherein the first parameter L_{0 side}For the reference point to the central plane ZX₀A measure of the distance of (d); second measurement distance +_{2 measurement of}The component of the connecting line of the reference point and the reference point along the length direction of the I-shaped steel on the same side of the reference point from the reference point to the central plane ZX₀A measured distance in the perpendicular direction, a third measured distance +_{3 measurement of}The component of the connecting line of the reference point and the reference point along the central line direction of the I-shaped steel section on the same side of the reference point from the reference point to the central plane ZX₀A measured value of the distance in the direction of the perpendicular.

6. The method for detecting the machining allowance of the flange face according to claim 5, wherein the second measurement distance +_{2 measurement of}Calculated by the following formula:

▽_{2 measurement of}＝R_Measuring×cosγ×sinα

Wherein R is_MeasuringA measure of the length of the reference point and the reference point connection;

alpha is on XY plane, the central plane of the I-steel and the central plane ZX₀The included angle of (a).

7. The method for detecting the machining allowance of the flange face according to claim 5, wherein the third measurement distance +_{3 measurement of}Obtained by

▽_{3 measurement of}＝R_Measuring×sinγ×sinβ×cosα

Wherein R is_MeasuringA measurement of the reference point and the reference point;

beta is on YZ plane, I-steel central plane and the central plane ZX₀Angle of (2)

Alpha is on XY plane, the central line of the I-steel and the central plane ZX₀The included angle of (a).

8. The method according to claim 4, wherein the fourth parameter L is obtained_{n is}The method is realized by the following steps:

L_{n is}＝L_{Theory of action}+▽_{2 in the theory of}+▽_{3 in the theory of}；

Wherein the second parameter L_{Theory of action}For the reference point to the central plane ZX₀A theoretical value of the distance of (a); second theoretical distance +_{2 in the theory of}The component of the connecting line of the reference point and the reference point along the length direction of the I-shaped steel on the same side of the reference point from the reference point to the central plane ZX₀Is measured, a theoretical value of the distance in the perpendicular direction, a third theoretical distance_{3 in the theory of}The component of the connecting line of the reference point and the reference point along the central line direction of the I-shaped steel section on the same side of the reference point from the reference point to the central plane ZX₀Is a theoretical value of the distance in the perpendicular direction.