JPH0788935A - Tapered gauge for high-temperature die and method for measuring lip clearance of high-temperature die - Google Patents

Abstract

PURPOSE:To reduce an error of a scale caused by a temperature increase of a gauge to enhance a measuring accuracy by a method wherein a tapered gauge for a high-temperature die is made of metal having a specific thermal expansion coefficient. CONSTITUTION:A gauge 10 is a wedge-form body having two faces which are opposed to each other at a predetermined angle. A front face 11 of the gauge 10 is calibrated at predetermined intervals along the longitudinal direction thereof with respect to a distance between the two faces in the orthogonal direction to the longitudinal direction of the wedge-form body. The front face 11 is calibrated, for example, from 0.6 to 0.85mm in 10mum with respect to a distance between the two faces in the orthogonal direction to the longitudinal direction of the wedge-form body. A support part 12 of the order of 5mm thickness is provided at the base end of the gauge 10. As the material of the gauge 10, a metal having a thermal expansion coefficient of 4X10<-2>/ deg.C or less is used. As a result, an error of a lip clearance can be suppressed to the extent that it can be substantially ignored. As the material, for example, an iron-nickel alloy having an FCDLE3 standard listed in JIS-J-5511 is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high temperature die taper gauge for measuring the lip clearance of a high temperature die for extruding a molding object into a film in a state of being heated to a high temperature, and a taper gauge for the high temperature die. The present invention relates to a method for measuring lip clearance of a high temperature die.

[0002]

2. Description of the Related Art When a plastic or the like is formed into a film, a die having a pair of lip portions facing each other with a groove-like gap formed at the lower end while the plastic or the like is melted. Is generally heated to 100 to 400 ° C., and the melted object to be filled in this die (high temperature die) is extruded into a film shape downward from the gap of the lip portion.

Among the quality of the formed film, the thickness of the film is a particularly important factor. The thickness of the film is mainly determined by the width of the lip portion, that is, the lip clearance. This lip clearance causes a fluctuation of several tens to several hundreds of μm due to the internal pressure of the molding target filled in the high temperature die, and the Due to the thermal strain of the high temperature die, a fluctuation of several to several tens of μm occurs.

Therefore, in order to maintain the lip clearance constant, the lip clearance is measured by using a taper gauge for high temperature die (hereinafter, abbreviated as gauge), and the variation of the lip clearance is corrected based on the result. ing.

FIG. 6 and FIG. 7 show examples of the shape of the gauge 1. The gauge 1 is a wedge-shaped body having two surfaces facing each other at a predetermined angle, and the front surface 2 has a distance in the direction perpendicular to the longitudinal direction of the wedge-shaped body between the two surfaces along the longitudinal direction. Are graduated at a predetermined interval.
In the case of the figure, on the front surface 2, the distance between the two surfaces in the direction orthogonal to the longitudinal direction of the wedge-shaped body is 0.5 mm to 2.5 mm.
Up to 50 μm increments.

Then, the gauge 1 is inserted into the gap between the lip portions from below so that the two surfaces are parallel to the lip portion of the high temperature die, and the two surfaces are in contact with the lower end edges of the lip portions, respectively. That is, at the position where the gauge 1 cannot be inserted into the gap between the lip portions any more, the scale of the gauge 1 at the contact portion with the lip portion is read. This value becomes the measured value of the lip clearance.

[0007]

The gauge 1 is made of stainless hardened steel such as SUS304 as a material. However, since these materials have a relatively large coefficient of thermal expansion of about 20 × 10 ⁻⁶ / ° C., when the temperature of the gauge 1 rises due to contact with a high temperature die during measurement of lip clearance, the gauge 1 itself expands. Then, there is a problem that the scale of the gauge 1 becomes inaccurate and the measurement accuracy of the lip clearance decreases. Moreover,
Since the gauge 1 has a large thermal expansion, the scale is, for example, 50 μm.
There is also a problem in that it is unavoidable that the pitch is rough and, as a result, the reading error becomes large and the measurement accuracy of the lip clearance further deteriorates.

Further, among the variations in lip clearance during extrusion molding, although variations due to thermal strain of the high temperature die due to heating can be measured, variations in lip clearance due to the internal pressure of the object to be molded filled in the high temperature die do not occur. However, the presence of an object to be molded extruded in the form of a film downward from the lip portion is an obstacle and cannot be measured because the object to be molded is dangerous at a high temperature. That is, it is practically impossible to measure the lip clearance during the extrusion molding of the object to be molded with high accuracy by the conventional gauge 1 and the lip clearance measuring method using the gauge 1.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a wedge-shaped body having two surfaces facing each other at a predetermined angle, and a longitudinal direction of the wedge-shaped body between the two surfaces. The distance in the direction orthogonal to each other is graduated on at least one of the two surfaces at predetermined intervals along the longitudinal direction, and in particular, the material has a coefficient of thermal expansion of 4 × 10 ⁻⁶ / ° C. or less. And a gauge for measuring the lip clearance of a high temperature die using the gauge.

Further, in the lip clearance measuring method for a high temperature die according to the present invention, a semi-cylindrical shape which is convex upward is formed, and the width in the direction perpendicular to the axial direction is variable at the uppermost end thereof. A jig having a cover in which a groove-shaped void is extended along the axial direction is prepared, and the gauge is brought into contact with the edges of the cover, which are opposed to each other at both ends of the two surfaces with the void interposed therebetween. In this state, the taper gauge for the high temperature die protruding upward from the gap is further provided between the lip portions until the two surfaces contact the lower end edges of the lip portions of the high temperature die. It is characterized in that it is inserted into the gap and the scale of the taper gauge for the high temperature die at the contact portion with the lip portion is measured.

[0011]

In the gauge of the present invention, a metal having a coefficient of thermal expansion of 4 × 10 ⁻⁶ / ° C. or less is used as the material,
Even when the temperature of the gauge rises due to contact with the high temperature die during measurement of the lip clearance, the thermal expansion of the gauge is suppressed to a negligible extent. Therefore, the error of the gauge scale caused by the temperature rise of the gauge is reduced, and the measurement accuracy of the lip clearance is improved. Further, since the thermal expansion of the gauge is small, the scale can be made fine, and as a result, the reading error of the scale is reduced.

Further, in the method for measuring lip clearance of a high temperature die according to the present invention, the gauge is provided with two surfaces facing each other at a predetermined angle from a gap formed at an upper end of a jig having a semi-cylindrical shape protruding upward. With both ends of the cover abutting against the edges of the cover, the cover is projected upward, and the lip clearance is measured by using the part protruding upward. Therefore, even with respect to the high temperature die during extrusion molding of the molding target, while excluding the molten molding target extruded in the form of a film downward from the lip portion by the jig and the gauge, A measurement can be made.

[0013]

Embodiments of the present invention will now be described in more detail with reference to the drawings. The gauge 10 according to the present invention has a structure in which the gauges 10 face each other at a predetermined angle as shown in FIGS.
On the front surface 11 of the wedge-shaped body having a surface, the distance between the two surfaces in the direction orthogonal to the longitudinal direction of the wedge-shaped body is graduated at predetermined intervals along the longitudinal direction. In the case of the figure,
On the front surface 11, the distance between the two surfaces in the direction orthogonal to the longitudinal direction of the wedge-shaped body is from 0.6 mm to 0.85 mm,
It is graduated in 10 μm increments. A support portion 12 having a thickness of about 5 mm is formed at the base end of the gauge 10.

Here, the gauge 10 uses a metal having a coefficient of thermal expansion of 4 × 10 ⁻⁶ / ° C. or less as a material. This is because if the coefficient of thermal expansion is maintained at 4 × 10 ⁻⁶ / ° C. or less, the error in the lip clearance measured using the gauge 10 is suppressed to a practically negligible level. In the case of this embodiment, as the material of the gauge 10,
FCDLE3 standard iron according to JIS J-5511-
A nickel alloy (coefficient of thermal expansion: 2 to 4 × 10 ⁻⁶ / ° C.) is used.

Next, regarding the method for measuring the lip clearance using the gauge 10 of the present invention, particularly 100 to 4
The case of measuring the lip clearance of a high temperature die during extrusion molding of a molding target into a film in the state of being heated to 00 ° C. will be described below as an example.

When measuring the lip clearance of the high temperature die during extrusion molding of the object to be molded into a film, for example, a jig 13 as shown in FIGS. 3 and 4 is used. Of these, reference numeral 14 is a cover having a semi-cylindrical shape that is convex upward,
At the uppermost end of the cover 14, a groove-like void S is provided in the cover 1.
4 is extended along the axial direction. In addition, the cover 14
Is a bar 1 which is orthogonal to the axis of the cover 14 at its lower end.
5, the shaft 15 is movably supported along the axis of the bar 15 and, as a result, the width H of the space S in the direction orthogonal to the axis of the cover 14.
Is variable.

When measuring the lip clearance,
First, the width H of the gap S is adjusted so that both ends of the two surfaces facing each other at a predetermined angle of the gauge 10 come into contact with the opposite edges of the cover 14 via the gap S, respectively. The space S is projected upward. Next, holding the bar 15 with one hand and the support portion 12 with the other hand, as shown in FIG. 5, from below the high temperature die 16 during extrusion molding of the molding target F into the upper end of the cover 14. The high temperature die 1
The lower end edge 16a of the lip portion of 6 is pressed.

Further, the tip end portion of the gauge 10 is inserted into the gap between the lip portions until the two surfaces come into contact with the lower end edges 16a of the lip portions.
The scale of the gauge 10 at the contact portion P with 6a is measured. This value corresponds to the lip clearance of the high temperature die 16 during extrusion molding of the molding target H into a film.

Here, the gauge 10 of the present invention uses a metal having a coefficient of thermal expansion of 4 × 10 ⁻⁶ / ° C. or less as a material thereof, so that the gauge 10 and the high temperature die 16 are used during the measurement of the lip clearance. Even if the temperature of the gauge 10 rises due to contact, the thermal expansion of the gauge 10 is suppressed to a negligible extent. Therefore, the error in the scale of the gauge 10 caused by the temperature rise of the gauge 10 is reduced, and the measurement accuracy of the lip clearance is improved. Furthermore, since the thermal expansion of the gauge 10 is reduced, the scale of the gauge 10 is changed to the conventional gauge 1.
However, the reading error of the scale is reduced.

Further, in the lip clearance measuring method for the high temperature die 16 according to the present invention, the cover 1 in which the both ends of the two faces of the gauge 10 which face each other at a predetermined angle are opposed to each other through the space S.
4 is made to project upward from the space S while making contact with the respective edges of 4, and the upwardly projecting portion is used to measure the lip clearance while closing the gap between the lip portions.

Therefore, the molten object H to be extruded downward in the form of a film from the lip portion is the jig 13
And the gauge 10 removes the jig 13 from the outside, and as a result, the object H to be molded becomes an obstacle when reading the scale of the gauge 10 or touches the measurer's hand during measurement of the lip clearance. There is no. That is, according to the lip clearance measuring method of the high temperature die 16 according to the present invention, the lip clearance can be safely measured even for the high temperature die 16 during extrusion molding of the molding target H.

The jig 13 is not necessary when measuring the lip clearance of the high temperature die 16 which has not been subjected to extrusion molding of the molding object H. In this case, simply gauge 10
Are inserted into the lip portion from below until the two surfaces come into contact with the lower edge 16a of the lip portion, respectively.
The scale of the gauge 10 at the contact portion P with 6a is measured.

[0023]

As described above, according to the gauge of the present invention and the method for measuring the lip clearance of a high temperature die using this gauge, the lip clearance of the high temperature die during extrusion molding of the object to be molded is highly accurate. It becomes possible to measure with.

[Brief description of drawings]

FIG. 1 is a front view along an arrow I showing an example of the shape of a gauge according to the present invention.

FIG. 2 is an arrow II showing an example of the shape of a gauge according to the present invention.
It is a side view which followed.

FIG. 3 is a side view along an arrow III showing an example of the structure of a jig used for measuring lip clearance of a high temperature die according to the present invention.

FIG. 4 is a top view taken along arrow IV showing an example of the structure of a jig used for measuring lip clearance of a high temperature die according to the present invention.

FIG. 5 is a diagram showing a measurement situation of lip clearance by a high temperature die lip clearance measuring method according to the present invention.

FIG. 6 is a front view taken along an arrow VI showing an example of the shape of a conventional gauge.

FIG. 7 is a side view taken along the arrow VII showing an example of the shape of a conventional gauge.

[Explanation of symbols]

 1,10 gauge (taper gauge for high temperature die) 2,11 front face 12 support portion 13 jig 14 cover 15 bar 16 high temperature die 16a lower edge of high temperature die F molded object H void width S void P lower edge of gauge and lip portion Contact area with the edge

Claims (3)

[Claims] 1. A wedge-shaped body having two surfaces facing each other at a predetermined angle is formed, and a distance between the two surfaces in a direction orthogonal to a longitudinal direction of the wedge-shaped body is at least one of the two surfaces. A taper gauge for a high temperature die, which is graduated at predetermined intervals along the longitudinal direction, and whose material has a thermal expansion coefficient of 4
A taper gauge for a high temperature die, which is a metal of × 10 ^-6 / ° C or less. 2. The taper gauge for a high temperature die according to claim 1, wherein the metal is an iron-nickel alloy. 3. A lip clearance measuring method for a high temperature die, wherein a molded object is extruded downward in a film shape from a pair of lip portions facing each other with a gap of a predetermined width in a state of being heated to 100 to 400 ° C. A groove-like void having a semi-cylindrical shape protruding upward and having a variable width in the direction orthogonal to the axial direction is provided at the uppermost end thereof along the axial direction. A jig having a cover is prepared, and a wedge-shaped body having two surfaces facing each other at a predetermined angle is formed from the void, and a distance between the two surfaces in a direction orthogonal to the longitudinal direction of the wedge-shaped body is the two surfaces. A taper gauge for high temperature die, which is graduated at a predetermined interval along the longitudinal direction on at least one of the two surfaces, is brought into contact with both ends of the two surfaces to the edges of the cover facing each other through the gap. Protruding upward from the gap In addition, the high temperature die taper gauge that protrudes upward from the gap is inserted into the gap until the two surfaces come into contact with the lower end edges of the pair of lip portions, respectively. A method for measuring lip clearance of a high temperature die, comprising measuring a scale of the taper gauge for the high temperature die.