JPH0120108Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field The present invention relates to a lip clearance adjustment mechanism for an extrusion molding die.

(b) Prior Art Figures 1 to 3 show an example of a conventional lip gap adjustment mechanism in an extrusion molding die for producing, for example, a resin film by extruding molten resin through lip gaps that are long in the width direction and narrowly spaced. There is something to show. The die bodies 10 and 12 are placed adjacent to each other to form a small gap. A lip bar 14 is provided on the lower side of the die body 12. A lip gap 16 is formed between the die body 10 and the lip bar 14. The lip gap 16 is long in the width direction (vertical direction in FIG. 1), and the molten resin extruded through it becomes a thin film.
In order to adjust this lip clearance 16, a plurality of sets of inner adjustment bolts 18 and outer adjustment bolts 20 are provided. One end of the inner adjustment bolt 18 is fitted into a hole in the lip bar 14 and fixed by a set screw 22. A male thread provided on the outer diameter portion of the inner adjustment bolt 18 engages with a female thread provided on the inner diameter portion of the outer adjustment bolt 20. Further, a male thread provided on the outer diameter portion of the outer adjustment bolt 20 is engaged with a female thread of the die body 12. In order to make the thickness of the molten resin extruded from the lip gap 16 uniform in the width direction, it is necessary to adjust the lip gap 16 so that it becomes uniform in the width direction. Therefore, by rotating the outer adjustment bolt 20, the lip bar 14 is displaced via the inner adjustment bolt 18,
The gap at each position in the width direction of the lip gap 16 is adjusted. However, such a conventional lip gap adjustment mechanism has the following problems. That is, the rotation of the outer adjusting bolt 20 needs to be performed smoothly with as little force as possible, but when the outer adjusting bolt 20 is operated to displace the lip bar 14, depending on the manner of displacement, the set screw 22 may be attached to the lip bar 14. A bending moment may act on the inner adjustment bolt 18 that is fixed by the
In this case, excessive force acts on the screw between the inner adjustment bolt 18 and the outer adjustment bolt 20 and the screw between the outer adjustment bolt 20 and the die body 12, making it impossible to rotate the outer adjustment bolt 20. I had the inconvenience of not being able to do it.

(c) Purpose of the invention The object of the invention is to provide a lip clearance adjustment mechanism that can easily adjust the lip clearance without applying excessive force to the screw of the adjustment bolt when adjusting the lip clearance.

(d) Structure of the invention The invention provides a rotatable guide bush at the joint between the inner adjustment bolt and the lip bar, and the female thread that engages with the male thread on the outer diameter of the outer adjustment bolt is attached to a nut that is rotatably attached to the die body. By providing this, the above purpose is achieved.
That is, the lip clearance adjustment mechanism of an extrusion molding die according to the present invention includes a guide bush that is rotatably fitted into a plurality of vertical holes provided in a lip bar at predetermined intervals in the width direction, and a guide bush provided in the guide bush. an inner adjustment bolt whose one end is fitted into a hole and which is fixed by a set screw and has a male thread on its outer diameter; and a female thread on its inner diameter that engages with the male thread of the inner adjustment bolt and a male thread on its outer diameter a nut having a female thread that engages with the male thread of the outer adjustment bolt; and a nut holding member that supports the nut with respect to the second die body,
The nut is rotatable because the outer diameter portion of the nut that contacts the second die body and the nut holding member is formed by a partial cylindrical surface having an axial center parallel to the axial center of the guide bush.

(E) Example The following is an example of the present invention as shown in the fourth and fifth figures of the attached drawings.
This will be explained based on the diagram.

A lip bar 36 is attached to the lower side of the second die body 32 adjacent to the first die body 30 by a bolt 34.
is installed. The first die body 30, the second die body 32, and the lip bar 36 have a predetermined length in the width direction (vertical direction in FIG. 4), and there is a width between the first die body 30 and the lip bar 36. A long lip gap 38 is formed in the direction.
The lip bar 36 is provided with a plurality of vertical holes 40 (in the vertical direction in FIG. 5) at predetermined intervals in the width direction, and guide bushes 42 are fitted into the holes 40. Guide bush 42
A hole 44 is provided in the direction perpendicular to the axis, and one end of an inner adjustment bolt 46 is fitted into this hole 44. One end of the inner adjustment bolt 46 is fixed to the guide bush 42 by a set screw 48.
A male thread (for example, M12 x P1.25) provided on the outer diameter of the inner adjustment bolt 46 is connected to the outer adjustment bolt 50.
It engages with a female thread provided on the inner diameter of the
A male thread (for example, M20×P1.5) provided on the outer diameter portion of the outer adjustment bolt 50 is engaged with a female thread of the nut 52. The nut 52 is supported with respect to the second die body 32 by a nut holding member 56 that is attached to the second die body 32 by a bolt 54. A part of the outer diameter of the nut 52 is formed by a partial cylindrical surface 52a. The partial cylindrical surface 52a is located at the axial center 70 of the guide bush 42.
It has an axial center 80 parallel to (that is, an axial center 80 in the vertical direction in FIG. 5). The nut 52 is connected to the second die body 3 by this partial cylindrical surface 52a.
2 and the nut holding member 56. That is, the second die main body 32 and the nut holding member 5
A cylindrical depression is also formed on the 6th side. Therefore, the nut 52 is rotatable about the aforementioned shaft center 80. The lip bar 36 has bolts 3
A slot 60 is provided which connects the hole 58 through which the 4 is passed and the left side side in FIG. A slot 60 is located between each hole 40.

Next, the operation of this embodiment will be explained. The lip clearance 38 can be adjusted by rotating the outer adjusting bolt 50, which transmits the axial force generated on the inner adjusting bolt 46 due to the difference in thread pitch to the lip bar 36 via the guide bushing 42. This is done by displacement. By appropriately adjusting the plurality of outer adjustment bolts 50 provided at predetermined intervals in the width direction, the lip clearance 38 can be made uniform in the width direction. During the above adjustment, no bending moment is applied to the inner adjustment bolt 46 and the outer adjustment bolt 50 due to the displacement of the lip bar 36. This is because the inner adjustment bolt 46 and the lip bar 36 are connected via the rotatable guide bush 42, and the nut 52 is rotatably supported with respect to the second die body 32. For example, as shown in FIG. 4, there is a misalignment (or displacement) in the width direction of dimension d between the original axis center of the inner adjustment bolt 46 and the center of the guide bush 42.
If this occurs, the entire nut 52, outer adjustment bolt 50, inner adjustment bolt 46, and guide bush 42 are tilted by the angle θ, so that the inner adjustment bolt 46 and the outer adjustment bolt 50 are not forced. No force acts. Furthermore, since the lip bar 36 is provided with a slot 60 so that it can be deformed with a relatively small force, the lip clearance 38 can be adjusted by rotating the outer adjustment bolt 50 with a relatively small force. I can do it.

(f) Effect of the invention As explained above, according to the invention, the first die body and the second die body adjacent to the first die body
In a lip clearance adjustment mechanism for an extrusion molding die that has a die body and a lip bar that is provided at the bottom of the second die body and forms a long lip gap in the axial direction between the lip bar and the first die body. A guide bush that is rotatably fitted into a plurality of vertical holes provided at predetermined intervals, and a guide bush whose one end is fitted into the hole provided in the guide bush and is fixed by a set screw and is attached to the outer diameter portion. An inner adjustment bolt having a male thread, an outer adjustment bolt having a female thread on the inner diameter part that engages with the male thread of the inner adjustment bolt and a male thread on the outer diameter part, a nut having a female thread that engages with the male thread of the outer adjustment bolt, and a nut. Second
a nut holding member that supports the die body;
The nut is rotatable because the outer diameter portion of the nut that contacts the second die body and the nut holding member is formed by a partial cylindrical surface having an axial center parallel to the axial center of the guide bush. Therefore, the lip gap can be easily adjusted in the width direction, and the thickness of the molten resin extruded from the lip gap can be made uniform in the width direction.

[Brief explanation of the drawing]

Figure 1 is a plan sectional view showing the lip gap adjustment mechanism of a conventional extrusion molding die, Figure 2 is a sectional view taken along the - line of the lip gap adjustment mechanism of the extrusion die shown in Figure 1, and Figure 3. is a sectional view taken along the - line in Fig. 2, Fig. 4 is a plan sectional view of the lip gap adjustment mechanism of an extrusion molding die according to the present invention, and Fig.
This figure is a sectional view taken along the - line of the lip clearance adjustment mechanism of the extrusion molding die shown in FIG. 4. 30...First die body, 32...Second die body, 34...Bolt, 36...Rip bar, 3
8... Lip clearance, 40... Hole, 42... Guide bush, 44... Hole, 46... Inner adjustment bolt, 48... Set screw, 50... Outer adjustment bolt, 52... Nut, 54... Bolt , 56...
Nut holding member, 58...hole, 60...slot.

Claims (1)

[Claims for Utility Model Registration] An axially long lip between the first die body 30, the second die body 32 adjacent to the first die body, and the first die body provided at the lower part of the second die body. a lip bar 36 forming a gap 38;
In the lip clearance adjustment mechanism for an extrusion molding die, the lip clearance adjustment mechanism includes a guide bush 42 rotatably fitted into a plurality of vertical holes 40 provided in the lip bar at predetermined intervals in the axial direction, and a guide bush 42 provided in the guide bush. An inner adjustment bolt 46 whose one end is fitted into the hole 44 and fixed by a set screw 48 and has a male thread on the outer diameter part, and an inner adjustment bolt 46 having a female thread on the inner diameter part that engages with the male thread of the inner adjustment bolt and on the outer diameter part. It has an outer adjustment bolt 50 with a male thread, a nut 52 with a female thread that engages with the male thread of the outer adjustment bolt, and a nut holding member 56 that supports the nut with respect to the second die body. Extrusion molding characterized in that the portion of the diameter portion that contacts the second die body and the nut holding member is formed by a partial cylindrical surface 52a having an axial center 80 parallel to the axial center 70 of the guide bushing, and is rotatable. lip clearance adjustment mechanism for die.