CN110815872B - Composite pultrusion part straightness monitoring and adjusting method - Google Patents
Composite pultrusion part straightness monitoring and adjusting method Download PDFInfo
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- CN110815872B CN110815872B CN201911157593.1A CN201911157593A CN110815872B CN 110815872 B CN110815872 B CN 110815872B CN 201911157593 A CN201911157593 A CN 201911157593A CN 110815872 B CN110815872 B CN 110815872B
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- pultrusion
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- straightness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
Abstract
The invention relates to the technical field of production monitoring, in particular to a composite pultrusion straightness monitoring method, which specifically comprises the steps of taking the position of a pultrusion part pulled and extruded from a die as a starting point, arranging at least one measuring point along the pultrusion direction, and evaluating the straightness deviation degree of the pultrusion part through the measuring data of each measuring point, wherein the number of the measuring points can be one, two or three, and the distance between the measuring points can be uniform or non-uniform. According to the invention, through the arrangement of the measuring points, the real-time monitoring can be carried out along with the continuous drawing and extrusion process of the pultruded part in the die, so that the deviation degree of the pultruded part relative to the originally designed linear state is judged, the monitoring is carried out at the first time, the position of the deviation and the deviation amount are determined, and the problem is found and solved as soon as possible. Meanwhile, the invention also discloses a composite pultrusion part straightness adjusting method.
Description
Technical Field
The invention relates to the technical field of production monitoring, in particular to a composite pultrusion straightness monitoring and adjusting method.
Background
Currently, during the production of composite pultrusion, the straightness of the product can deviate for the following reasons:
1. the equipment of the preforming and shaping die has deviation on the reference;
2. the formed product has an asymmetric cross section shape, and the larger the asymmetry degree is, the more unstable the straightness is;
3. according to the existing production experience, when new resin glue solution is added in the existing production process, the straightness of the product is changed due to the difference of the concentration of the new glue solution and the old glue solution;
4. the straightness changes to a certain extent in the cloth receiving process, large humidity and large temperature change.
Due to the problems, the rejection rate of the finished pultrusion piece products produced at present is high, the production cost is improved to a certain extent, but an effective monitoring method for early warning the problems is not provided, so that the problems are solved as early as possible.
In view of the above problems, the present inventors have conducted research and innovation based on practical experience and professional knowledge that is abundant over many years in engineering application of such products, and together with the application of theory, in order to create a method for monitoring and adjusting straightness of composite pultrusion members, so that the method is more practical.
Disclosure of Invention
The invention provides composite pultrusion straightness monitoring, and solves the problems in the background technology. Meanwhile, the invention also discloses a composite pultrusion part straightness adjusting method.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for monitoring the straightness of a pultruded part comprises the steps of taking the position of the pultruded part, which is pulled and extruded from a die, as a starting point, arranging at least one measuring point along the pultrusion direction, and evaluating the straightness deviation degree of the pultruded part according to the measuring data of each measuring point.
Furthermore, the measuring point is symmetrically provided with two linear distance measuring devices, and the distance measuring direction is perpendicular to the pultrusion direction.
Further, one measurement point is provided.
Further, the measurement points are provided in two.
Further, the measuring points are provided in three, and a unique circle is determined by three measuring positions on the pultrudate measured by the three measuring points, and the degree of deviation of the straightness of the pultrudate is evaluated by the unique circle.
Further, the pitch of each of the measurement points is uniform.
Further, the evaluation method comprises the following steps:
and determining the arc corresponding to the arc length on the unique circle through the length of the pultruded piece which is pultruded, and taking the distance as an evaluation index of the straightness accuracy deviation degree through determining the distance from the middle point of the arc to the connecting line of two end points of the arc.
Further, the distance is obtained by the following formula:
H＝r-r*cosθ
θ＝S/2r
wherein the content of the first and second substances,
r is the radius value of the unique circle;
theta is half of the radian corresponding to the arc;
s is the arc length of the arc;
a. b and c are respectively distance values of which the starting points respectively reach three measuring positions in the pultrusion direction;
x, y and z are respectively the distances from the three measuring positions to a straight line which passes through the starting point and is parallel to the design direction of the pultrusion piece;
u, v and the length of three sides of the triangle which are used for calculating the radius value r respectively for the three measuring positions;
p is a set intermediate quantity.
Further, the calculation formula of the arc length is as follows:
wherein the content of the first and second substances,
r is the radius value of the unique circle;
h is the distance.
According to the straightness adjusting method for the composite pultrusion part, the pultrusion discharging position of the pultrusion part is adjusted according to the data monitored by the composite pultrusion part straightness monitoring method, and therefore the straightness is adjusted.
Through the technical scheme, the invention has the beneficial effects that:
according to the invention, through the arrangement of the measuring points, the real-time monitoring can be carried out along with the continuous drawing and extrusion process of the pultruded part in the die, so that the deviation degree of the pultruded part relative to the originally designed linear state is judged, the monitoring is carried out at the first time, the position of the deviation and the deviation amount are determined, and the problem is found and solved as soon as possible.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of measurement contents when only one measurement point is set;
FIG. 2 is a schematic diagram of measurement contents when two measurement points are set;
FIG. 3 is a schematic view of the starting point of the single circle being pultruded from the die by the pultrusion;
FIG. 4 is a schematic view of a starting point for a unique circle that is not drawn out of the die by the pultrusion;
FIGS. 5 to 9 are schematic diagrams illustrating the calculation contents of u, v and w;
FIG. 10 is a comparison of different unique circles;
fig. 11 is a schematic diagram of related contents in an optimization calculation of the distance H.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Embodiments of the present invention are written in a progressive manner.
A composite material pultrusion part straightness monitoring method is characterized in that a position where a pultrusion part is pulled out from a die is taken as a starting point, at least one measuring point is arranged along a pultrusion direction, and the straightness deviation degree of the pultrusion part is evaluated through measuring data of each measuring point.
Through the setting of above-mentioned measuring point, can follow the pultrusion and constantly draw the process of extruding in the mould and carry out real-time monitoring to judge the degree of deviation for the pultrusion of the straight line state of original design, the process of assessing through measured data has following two kinds of embodiments:
example one
The measuring points are symmetrically provided with two linear distance measuring devices, and the distance measuring direction is perpendicular to the pultrusion direction.
As shown in fig. 1, when only one measuring point is set, the deviation distance x of the pultruded piece relative to the originally designed linear state can be measured by the linear distance measuring device, and the degree of deviation can be directly evaluated by the value of x.
As shown in fig. 2, when two measuring points are provided, the measuring principle is consistent with the above process, but a more accurate evaluation can be performed by the measured value between the two measuring points, the linear distance measuring device of the second measuring point can measure the deviation distance y of the pultruded piece relative to the originally designed linear state, and the distance b of the linear distance measuring device relative to the starting point also participates in the evaluation process. In this case, b may be 2 times a, or may be other times.
Example two
The number of the measuring points is three, and a unique circle is determined by three measuring positions on the pultrudate measured by the three measuring points, and the straightness deviation degree of the pultrudate is evaluated by the unique circle.
It is well known that three points can be clearly defined to determine a unique circle, and it is emphasized that the unique circle determined in the present embodiment may pass through the starting point of the pultrusion pulling out from the die, as shown in fig. 3 in particular; the starting point of the pultrusion from the die may not be used, as shown in fig. 4 in particular, because the degree of deviation of the straight line is determined by the unique circle itself in this embodiment, unlike the measurement in the first embodiment, the evaluation result can be obtained in both of the two embodiments.
Where the spacing of the measurement points is uniform, this may reduce the difficulty of determining a unique circle, but as a preferred approach, a non-uniform pattern is also within the scope of the present invention.
The specific evaluation method by the unique circle is as follows:
determining the arc corresponding to the arc length S on the unique circle through the length of the pultruded piece which is pultruded, and taking the distance H as an evaluation index of the straightness accuracy deviation degree through determining the distance H from the middle point of the arc to the connecting line of two end points of the arc.
As shown in fig. 3 and 4, the position of the distance H is already indicated, and the deviation degree of the pultrusion part in the whole length range of the completed pultrusion can be monitored by judging the deviation degree of the straightness through the distance H, which is more macroscopic and accurate compared with the method in the first embodiment.
Wherein, the distance H is obtained by the following formula:
H＝r-r*cosθ
θ＝S/2r
wherein the content of the first and second substances,
r is the radius value of the unique circle;
theta is half of the radian corresponding to the arc;
s is the arc length of the arc;
a. b and c are respectively distance values of which the starting points respectively reach three measuring positions in the pultrusion direction;
x, y and z are respectively the distances from the three measuring positions to a straight line which passes through the starting point and is parallel to the pultrusion direction;
u, v and w are the lengths of three sides of the triangle respectively used for calculating the radius value r at the three measuring positions;
p is a set intermediate quantity.
In the above calculation method, a, b and c, and x, y and z are all involved in the calculation as known quantities, and u, v and w are obtained according to the procedure shown in fig. 5 to 9, so that the r value is obtained from the obtained p value, and since S is the pultrusion length, it is also clear that the θ value is obtained from the S value and the r value, and finally the H value is obtained. The evaluation of the H value determined in this way is more accurate because when the r value is increased, as shown in fig. 10, r2 > r1, then H2 < H1 under the same S value, that is, in the case of r2, the actual deviation degree of straightness is smaller, but when the measurement is performed by the method in the first embodiment, the actual deviation degree of straightness in the case of r1 is considered to be smaller due to the limitation of the starting point, and therefore the measurement is inaccurate, and in this embodiment, the limitation of the starting point is removed, and the workpiece itself after pultrusion is more concerned, in other words, when the deviation amount of the whole pultruded piece relative to the starting point is larger, there may be a case that the straightness is better, for example, the case that the whole piece is deviated relative to the starting point in the case of r2 shown in fig. 10.
In this way, the object of the invention can be achieved when the S value is taken as the actual pultruded workpiece length, but since there may be a deviation in the measurement of the S value itself in the corresponding process, which may reduce the accuracy of the final result, the arc length S is preferably calculated as:
wherein the content of the first and second substances,
r is the radius value of the unique circle;
h is a distance.
The derivation of the above equation is as follows, and the calculation of the two distances e and d as shown in fig. 11 is as follows:
in this case, in the actual production process, the value of S is very close to the value of 2d, so in this preferred embodiment, S is made to be 2d, and the final H value is calculated without the influence of S value accuracy, and finally determined:
and calculating a final more accurate H value through the formula.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A composite pultrusion part straightness monitoring method is characterized in that,
setting at least one measuring point along the pultrusion direction by taking the position of the pultruded piece which is pulled and extruded from the die as a starting point, and evaluating the straightness deviation degree of the pultruded piece according to the measuring data of each measuring point;
two linear distance measuring devices are symmetrically arranged at the measuring point, and the distance measuring direction is perpendicular to the pultrusion direction;
the number of the measuring points is three, a unique circle is determined through three measuring positions on the pultrudate measured by the three measuring points, and the straightness deviation degree of the pultrudate is evaluated through the unique circle;
the evaluation method comprises the following steps:
and determining the arc corresponding to the arc length on the unique circle through the length of the pultruded piece which is pultruded, and taking the distance as an evaluation index of the straightness accuracy deviation degree through determining the distance from the middle point of the arc to the connecting line of two end points of the arc.
2. The composite pultrusion straightness monitoring method according to claim 1, wherein the distance between the measuring points is uniform.
3. The composite pultrusion straightness monitoring method according to claim 1, wherein the distance is obtained through the following formula:
H＝r-r*cosθ
θ＝S/2r
wherein the content of the first and second substances,
r is the radius value of the unique circle;
theta is half of the radian corresponding to the arc;
s is the arc length of the arc;
a. b and c are respectively distance values of which the starting points respectively reach three measuring positions in the pultrusion direction;
x, y and z are respectively the distances from the three measuring positions to a straight line which passes through the starting point and is parallel to the design direction of the pultrusion piece;
u, v and the length of three sides of the triangle which are used for calculating the radius value r respectively for the three measuring positions;
p is a set intermediate quantity.
4. The composite pultrusion straightness monitoring method according to claim 3, wherein the arc length is calculated by the formula:
wherein the content of the first and second substances,
r is the radius value of the unique circle;
h is the distance.
5. A composite pultrusion part linearity adjusting method is characterized in that the pultrusion discharging position of a pultrusion part is adjusted according to the data monitored by the composite pultrusion part linearity monitoring method as claimed in any one of claims 1 to 4, and therefore the linearity is adjusted.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232625A (en) * | 2002-02-12 | 2003-08-22 | Mitsutoyo Corp | Method of measuring straightness |
| CN104132636A (en) * | 2014-07-02 | 2014-11-05 | 丽水职业技术学院 | Linearity detection and judgment method for linear guide rail |
| CN104296716A (en) * | 2014-10-11 | 2015-01-21 | 中国人民解放军国防科学技术大学 | Ultra-precise straightness measuring method based on single-measuring-head error separation |
| CN109849375A (en) * | 2019-01-28 | 2019-06-07 | 江苏澳盛复合材料科技有限公司 | A kind of carbon plate extruding equipment that deviation correcting device is set |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003232625A (en) * | 2002-02-12 | 2003-08-22 | Mitsutoyo Corp | Method of measuring straightness |
| CN104132636A (en) * | 2014-07-02 | 2014-11-05 | 丽水职业技术学院 | Linearity detection and judgment method for linear guide rail |
| CN104296716A (en) * | 2014-10-11 | 2015-01-21 | 中国人民解放军国防科学技术大学 | Ultra-precise straightness measuring method based on single-measuring-head error separation |
| CN109849375A (en) * | 2019-01-28 | 2019-06-07 | 江苏澳盛复合材料科技有限公司 | A kind of carbon plate extruding equipment that deviation correcting device is set |
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