CN112556535A - Cable sheath extrusion thickness measuring method - Google Patents
Cable sheath extrusion thickness measuring method Download PDFInfo
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- CN112556535A CN112556535A CN202011454932.5A CN202011454932A CN112556535A CN 112556535 A CN112556535 A CN 112556535A CN 202011454932 A CN202011454932 A CN 202011454932A CN 112556535 A CN112556535 A CN 112556535A
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- extrusion molding
- thickness
- cable sheath
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- 238000001125 extrusion Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 69
- 238000012545 processing Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000007765 extrusion coating Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
Abstract
The invention provides a cable sheath extrusion thickness measuring method applied to the technical field of cable manufacturing, which comprises the following measuring steps: calculating the thickness D of the tape measure with the diameter of the cable core being plus 2 times before extrusion molding, and calculating the measurement control length l of the cable sleeve after extrusion molding of the cable sheath1(ii) a And then measuring the actual length value l of the extruded cable sheath of the cable sheath to be measured2(ii) a Measuring actual length value l of cable sheath after extrusion molding of cable sheath2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness size of the cable sheath meets the requirement, and the method for measuring the extrusion thickness of the cable sheath corrects the thickness of the extrusion molding sheath layer through the equivalent outer diameter value of the cable sheath, so that the processing quality of the thickness of the extrusion molding sheath layer is improved.
Description
Technical Field
The invention belongs to the technical field of cable manufacturing, and particularly relates to a method for measuring the extrusion thickness of a cable sheath.
Background
In the cable manufacturing process, the control level of the thickness of the extrusion layer of the cable sheath directly influences the product quality and the production cost, the thickness of the sheath layer is too large, the product cost is increased, and the product is unqualified due to too small thickness. At present, the sheath layer thickness control method commonly adopted in the cable production practice is as follows: in the extrusion production process, a measuring instrument is used for measuring the outer diameter or equivalent outer diameter of the extruded cable (namely the outer diameter obtained by measuring the perimeter), the outer diameter is compared with the outer diameter of the cable core before extrusion, the actual thickness of the sheath layer is calculated, the glue output of a main machine of the extrusion molding machine is finely adjusted, and the actual thickness of the sheath layer is measured and corrected for many times, so that the extrusion thickness of the sheath layer finally reaches the required range. When the measurement is performed according to the control method, a vernier caliper and a measuring tape are mostly selected for selecting a specific measuring instrument. From the feedback of control effect, there are some inherent defects and shortcomings in the above method, which are mainly reflected in: firstly, the vernier caliper is adopted to measure and control the outer diameter, most of cable cores twisted in the previous process are not round in practice, the periphery of a cable extruded out of a cable sheath is also not round, and the outer diameter numerical value difference of the cable measured in different directions of the same section is large, so that the fluctuation range of the actual thickness of a sheath layer is large; secondly, the circumference is measured and controlled by adopting the tape measure, although the error caused by the fact that the cable is not round is effectively overcome by measuring the outer circumference of the cable, the error which is unique to the circumference measured by adopting the tape measure also exists, and the fact that the circumference measured by adopting the tape measure is not the circumference of the cross section of the cable, but the length which is spirally increased is mainly shown. This error depends on the width, thickness of the tape measure and its own display accuracy.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the cable sheath extrusion thickness measuring method is simple in step, corrects the measuring error caused by the spiral rising length instead of the circumference of the cross section of an object by using the rapidly obtained measuring basic value, controls and corrects the thickness of the extrusion coating sheath layer by using the equivalent outer diameter value of the cable sheath, and improves the processing quality of the thickness of the extrusion coating sheath layer.
To solve the technical problems, the invention adopts the technical scheme that:
the invention relates to a method for measuring the extrusion thickness of a cable sheath, which comprises the following steps:
1) obtaining a measurement basic value, wherein the measurement basic value comprises an actual measurement length value l of the cable core before extrusion molding, a width value M of the tape measure, a thickness value t of the tape measure, an outer diameter value d of the cable core before extrusion molding, and a cable sheathControlling the thickness t after extrusion1；
2) Calculating the thickness value D of the tape measure of which the diameter of the cable core is plus 2 times before extrusion molding,
3) calculating the value l of the measurement control length of the cable jacket after the extrusion molding of the cable jacket1(ii) a And then measuring the actual length value l of the extruded cable sheath of the cable sheath to be measured2；
4) Measuring actual length value l of cable sheath after extrusion molding of cable sheath2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement.
When calculating the thickness value D of cable core diameter +2 times tape measure before the extrusion molding, according to the formula: d +2 t (pi D)2＝l2+M2Calculating the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding, and calculating l according to the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding2+M2The numerical value of (c).
Calculating the value l of the measurement control length of the cable jacket after the extrusion molding of the cable jacket1According to the formula: l1＝SQRT((PI()*(d+2*t+2*t1))2–M2) Calculating the value l of the cable sheath measurement control length after the extrusion molding of the cable sheath1。
If the actual length value l of the cable jacket is measured after the extrusion molding of the cable jacket2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Unequal, or actual length value l measured by cable jacket after extrusion molding of cable jacket2Cable jacket measurement control length value l after exceeding cable jacket extrusion molding1Allowable error value range when l2Greater than l1In practice, the traction speed can be increased or the screw speed of the extruder can be reduced in order to obtain the actual measured value l2Control at theoretically calculated control value l1Allowable error value range; when l is2Less than l1At the time of actual productionThe traction speed can be reduced or the rotating speed of a screw of the extruding machine can be increased in the process, so that the actual measured value l is obtained2Control at theoretically calculated control value l1Allowable error value range.
SQRT () is the open square root function and PI () is the circumferential rate function value.
The actual measurement length value l of the cable core before extrusion molding is the measurement length corresponding to the upper scale mark and the lower scale mark of the tape measure after the tape measure rotates around the cable core before extrusion molding for one circle.
L represents the length of the tape which is unfolded by one rotation, and H represents the height of the tape which rises by one rotation of the tape around the core before extrusion.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the method for measuring the extrusion thickness of the cable sheath changes the control method that in the prior art, a measuring instrument is adopted to measure the outer diameter or equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) of the extruded cable, the outer diameter is compared with the outer diameter of a cable core before extrusion, the actual thickness of the sheath layer is calculated, the glue output of a main machine of an extruder is finely adjusted, and the extrusion thickness of the sheath layer reaches the required range through multiple measurement and correction. Instead, the actual length value l of the cable jacket measured after the extrusion molding of the cable jacket is obtained through the obtained measurement basic value2And a cable jacket measurement control length value l after extrusion molding of the cable jacket1Then the actual length value l of the cable sheath after the extrusion molding of the cable sheath is measured2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement. Therefore, the method of comparing the outer diameter of the cable after extrusion or the equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) with the outer diameter of the cable core before extrusion to obtain the thickness of the sheath is not adopted. The method of the invention, using perimeter comparison, and the measured and obtained perimeters are such that, considering that the perimeter obtained when performing cable measurements is not the perimeter of a cross-section of an object,and the measuring error caused by the width and the thickness of the tape measure, so that the measuring precision is influenced, the measuring method is changed, the errors of various parameters are overcome, and the measuring precision is comprehensively improved, thereby effectively realizing the control of the thickness of the sheath and improving the processing quality of the cable. The method for measuring the extrusion thickness of the cable sheath has simple steps, corrects the measurement error caused by the spiral rising length instead of the circumference of the cross section of an object by using the rapidly obtained measurement basic value, controls and corrects the thickness of the extrusion molding sheath layer by using the equivalent outer diameter value of the cable sheath, and improves the thickness processing quality of the extrusion molding sheath layer.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the tape measure of the present invention in an extended configuration;
in the drawings, the reference numbers are respectively: 1. cable cores (cores); 2. a tape measure.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in the attached figure 1, the invention relates to a method for measuring the extrusion thickness of a cable sheath, which comprises the following steps: 1) obtaining a measurement basic value, wherein the measurement basic value comprises an actual measurement length value l of the cable core before extrusion molding, a width value M of the tape measure, a thickness value t of the tape measure, an outer diameter value d of the cable core before extrusion molding and a control thickness value t after extrusion molding of the cable sheath1(ii) a 2) Calculating the thickness value D of the tape measure of the diameter of the cable core which is plus 2 times of the diameter of the cable core before extrusion molding, 3) calculating the measurement control length value l of the cable sleeve after the extrusion molding of the cable sheath1(ii) a And then measuring the actual length value l of the extruded cable sheath of the cable sheath to be measured2；4) Measuring actual length value l of cable sheath after extrusion molding of cable sheath2Measurement and control of cable sheath after extrusion molding with cable sheathSystem length value l1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement. The steps change the control method that in the prior art, the outer diameter or the equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) of the extruded cable is measured by a measuring instrument, the outer diameter is compared with the outer diameter of the cable core before extrusion, the actual thickness of the sheath layer is calculated, the glue output of the main machine of the extruder is finely adjusted, and the sheath layer extrusion thickness reaches the required range through multiple measurement and correction. Instead, the actual length value l of the cable jacket measured after the extrusion molding of the cable jacket is obtained through the obtained measurement basic value2And a cable jacket measurement control length value l after extrusion molding of the cable jacket1Then the actual length value l of the cable sheath after the extrusion molding of the cable sheath is measured2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement. Therefore, the method of comparing the outer diameter of the cable after extrusion or the equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) with the outer diameter of the cable core before extrusion to obtain the thickness of the sheath is not adopted. The method adopts perimeter comparison, and the measured and obtained perimeters are changed, the errors of various parameters are overcome, the measurement precision is comprehensively improved, the control of the sheath thickness is effectively realized, and the cable processing quality is improved in view of the defect that the measurement precision is affected because the perimeter obtained during cable measurement is not the perimeter of the cross section of an object and the measurement errors caused by the width and the thickness of a measuring tape. The method for measuring the extrusion thickness of the cable sheath has simple steps, corrects the measurement error caused by the spiral rising length instead of the perimeter of the cross section of an object by using the rapidly obtained measurement basic value, and measures the extrusion thickness of the cable sheath by using the cable sheathThe numerical value of the equivalent outer diameter controls and corrects the thickness of the extrusion molding sheath layer, and the thickness processing quality of the extrusion molding sheath layer is improved.
According to the method for measuring the extrusion thickness of the cable sheath, when the thickness value D of the cable core diameter plus 2 times of the tape measure before extrusion molding is calculated, according to the formula: d +2 t (pi D)2＝l2+M2Calculating the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding, and calculating l according to the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding2+M2The numerical value of (c). Calculating the value l of the measurement control length of the cable jacket after the extrusion molding of the cable jacket1According to the formula: l1＝SQRT((PI()*(d+2*t+2*t1))2–M2) Calculating the value l of the cable sheath measurement control length after the extrusion molding of the cable sheath1. With the structure, the cable sheath measurement control length value l after the extrusion molding of the cable sheath can be accurately obtained1Measuring the actual length value l of the cable jacket after subsequent extrusion molding with the cable jacket2And (6) carrying out comparison. Therefore, the accurate judgment that the thickness of the sheath of the cable meets the standard requirement is effectively realized.
If the actual length value l of the cable jacket is measured after the extrusion molding of the cable jacket2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Unequal, or actual length value l measured by cable jacket after extrusion molding of cable jacket2Cable jacket measurement control length value l after exceeding cable jacket extrusion molding1Allowable error value range when l2Greater than l1In practice, the traction speed can be increased or the screw speed of the extruder can be reduced in order to obtain the actual measured value l2Control at theoretically calculated control value l1Allowable error value range; when l is2Less than l1In practice, the traction speed can be reduced or the screw speed of the extruder can be increased so that the actual measured value l is obtained2Control at theoretically calculated control value l1Allowable error value range. According to the structure, when the numerical difference after comparison is large, parameters need to be corrected, the thickness of the processed sheath is adjusted, the thickness of the sheath of the processed cable finally meets the set standard, and the quality is improved.
In the present invention, SQRT () is an open square root function, and PI () is a circumferential rate function value.
The actual measurement length value l of the cable core before extrusion molding is the measurement length corresponding to the upper scale mark and the lower scale mark of the tape measure after the tape measure rotates around the cable core before extrusion molding for one circle. That is, the length value is the length measured taking into account the spiral rise that occurs as the tape is wound around the cable. The length L of the tape which is unfolded after one rotation of the tape is represented by the length (the circumference of the cross section of the object) which is unfolded after one rotation of the tape, and the height H of the tape which is raised after one rotation of the tape around the cable core before extrusion is represented by the height H.
The method for measuring the extrusion thickness of the cable sheath changes the control method that in the prior art, a measuring instrument is adopted to measure the outer diameter or equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) of the extruded cable, the outer diameter is compared with the outer diameter of a cable core before extrusion, the actual thickness of the sheath layer is calculated, the glue output of a main machine of an extruder is finely adjusted, and the extrusion thickness of the sheath layer reaches the required range through multiple measurement and correction. Instead, the actual length value l of the cable jacket measured after the extrusion molding of the cable jacket is obtained through the obtained measurement basic value2And a cable jacket measurement control length value l after extrusion molding of the cable jacket1Then the actual length value l of the cable sheath after the extrusion molding of the cable sheath is measured2Comparing with the cable sheath measurement control length value l1 after the cable sheath is extruded, if the two values are equal or the cable sheath measurement actual length value l after the cable sheath is extruded2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement. Therefore, the method of comparing the outer diameter of the cable after extrusion or the equivalent outer diameter (namely the outer diameter calculated by measuring the perimeter) with the outer diameter of the cable core before extrusion to obtain the thickness of the sheath is not adopted. The method of the invention adopts perimeter comparison, and the measured and obtained perimeters are changed to overcome the defects that the measuring precision is influenced because the perimeter obtained when the cable is measured is not the perimeter of the cross section of the object and the measuring error caused by the width and the thickness of the measuring tape is considered, and the measuring method is changed to overcome the defects of various parametersAnd errors are generated, the measurement precision is comprehensively improved, so that the control of the thickness of the sheath is effectively realized, and the cable processing quality is improved. The method for measuring the extrusion thickness of the cable sheath has simple steps, corrects the measurement error caused by the spiral rising length instead of the circumference of the cross section of an object by using the measuring tape to measure the circumference, and controls and corrects the thickness of the extrusion molding sheath layer by using the equivalent outer diameter value of the cable sheath, thereby improving the thickness processing quality of the extrusion molding sheath layer.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (7)
1. A cable sheath extrusion thickness measuring method is characterized in that: the method for measuring the extrusion thickness of the cable sheath comprises the following measurement steps:
1) obtaining a measurement basic value, wherein the measurement basic value comprises an actual measurement length value l of the cable core before extrusion molding, a width value M of the tape measure, a thickness value t of the tape measure, an outer diameter value d of the cable core before extrusion molding and a control thickness value t after extrusion molding of the cable sheath1；
2) Calculating the thickness value D of the tape measure of which the diameter of the cable core is plus 2 times before extrusion molding,
3) calculating the value l of the measurement control length of the cable jacket after the extrusion molding of the cable jacket1(ii) a And then measuring the actual length value l of the extruded cable sheath of the cable sheath to be measured2；
4) Measuring actual length value l of cable sheath after extrusion molding of cable sheath2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Comparing, if the two values are equal or the actual length l measured by the cable jacket after the extrusion molding of the cable jacket2Cable sheath measurement control length value l after cable sheath extrusion molding1The allowable error value range shows that the thickness dimension of the cable sheath meets the requirement.
2. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: when calculating the thickness value D of cable core diameter +2 times tape measure before the extrusion molding, according to the formula: d +2 t (pi D)2＝l2+M2Calculating the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding, and calculating l according to the thickness D of the cable core diameter plus 2 times of the tape measure before extrusion molding2+M 2The numerical value of (c).
3. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: calculating the value l of the measurement control length of the cable jacket after the extrusion molding of the cable jacket1According to the formula: l1＝SQRT((PI()*(d+2*t+2*t1))2–M2) Calculating the value l of the cable sheath measurement control length after the extrusion molding of the cable sheath1。
4. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: if the actual length value l of the cable jacket is measured after the extrusion molding of the cable jacket2The length value l of cable sheath measurement control after extrusion molding with the cable sheath1Unequal, or actual length value l measured by cable jacket after extrusion molding of cable jacket2Cable jacket measurement control length value l after exceeding cable jacket extrusion molding1Allowable error value range when l2Greater than l1In practice, the traction speed can be increased or the screw speed of the extruder can be reduced in order to obtain the actual measured value l2Control at theoretically calculated control value l1Allowable error value range; when l is2Less than l1In practice, the traction speed can be reduced or the screw speed of the extruder can be increased so that the actual measured value l is obtained2Control at theoretically calculated control value l1Allowable error value range.
5. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: SQRT () is the open square root function and PI () is the circumferential rate function value.
6. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: the actual measurement length value l of the cable core before extrusion molding is the measurement length corresponding to the upper scale mark and the lower scale mark of the tape measure after the tape measure rotates around the cable core before extrusion molding for one circle.
7. The cable jacket extrusion thickness measuring method according to claim 1, characterized in that: l represents the length of the tape which is unfolded by one rotation, and H represents the height of the tape which rises by one rotation of the tape around the core before extrusion.
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