JPH06322412A - Manufacturing method of barrel with jacket - Google Patents

Abstract

(57) [Summary] [Purpose] Kneading and extruding polymer materials
When manufacturing a barrel with a jacket for an extruder,
Provided is a manufacturing method capable of manufacturing a long jacketed barrel with high heating / cooling efficiency at low cost and high quality. [Composition] A method for manufacturing a barrel with a jacket, wherein a barrel body (1) is provided with a jacket hole (19) for heat medium distribution from one end side to the other end side in the axial direction.
And an inner cylinder member 3 fitted inside so as to contact the inner surface of the outer cylinder member 2, and the outer peripheral surface of the inner cylinder member 3 or the outer cylinder member 2
After forming a jacket hole 19 forming groove 8 on the inner peripheral surface of the inner cylindrical member 3 and fitting the inner cylindrical member 3 into the outer cylindrical member 2, the inner cylindrical member 3 and the outer cylindrical member 2 are subjected to hot isostatic pressing means. Are integrated by diffusion bonding.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the production of barrels adopted for biaxial kneading / extrusion molding machines and the like for kneading / extruding rubber / plastics and the above-mentioned polymer materials to which inorganic or organic filler is added. It is about the method.

[0002]

2. Description of the Related Art The twin-screw barrel used for rubber / plastic kneading / extruding machines is made of Ni-based material which is excellent in abrasion resistance and corrosion resistance due to the high strength and high functionality of rubber / plastic products. A Co-based high alloy or a lining material in which hard particles are dispersed and strengthened is applied to the inner peripheral surface of the barrel body (mainly structural steel) under normal pressure sintering or HIP (hot isostatic pressing).
The one lined by the diffusion bonding method is widely used and is rapidly spreading.

As this type of barrel, there is a barrel provided with a jacket hole for circulating a heat medium for cooling, heat retention, and heating.
There is one described in Japanese Patent No. 258. The barrel with a jacket described in this publication is manufactured as follows.
First, as shown in FIG. 9, a pipe 32 for forming a jacket hole is spirally wound on the outer peripheral surface of a tubular steel core 31 from one end side to the other end side in the axial direction of the core 31. Turn the pipe
Import 33 with the end of 32 on the core 31 and out port
Fixed to 34 respectively. Next, as shown in FIG. 10, the core 31 with a pipe is set in the mold 35, molten metal is poured around the core 31, and the barrel outer peripheral portion 36 is formed by the cast metal, The pipe 32 is embedded in the cast metal to form a barrel 38 with a jacket. In addition, barrel 38
After formation, the Ni-based lining material 37 is lined by thermal spraying or overlaying.

[0004]

As the above-mentioned barrel becomes widespread, as a user need corresponding to processing and molding of high-performance plastic and the like, commercialization of a long jacketed barrel is desired, and as a commercial product, There is no long barrel with a jacket with high heating / cooling efficiency, and there is a need for a low-cost, long barrel with a jacket that is easy to manufacture and has high heating / cooling efficiency.

By the way, since the conventional one is a casting method, when manufacturing a long barrel, there is a large time lag between the start and the end of pouring, and as a result, there is a large deviation in the start of solidification. Occurs, which causes hot cracking and shrinkage cavities due to a decrease in the effect of the feeder. Therefore, a long product cannot be manufactured, and only a short product (for example, up to ^L / _D = 5, L: overall barrel length, D: inner diameter in one direction of a biaxial barrel) can be manufactured.

Further, even if both ends of the pipe 32 for forming the jacket hole can be fixed, the middle part cannot be fixed at a predetermined position, and the pipe 32 is largely deformed due to thermal stress due to molten metal during casting. Therefore, the distance between the pipe 32 and the inner peripheral surface of the barrel 38 varies. Further, the hole diameter of the jacket is restricted by the wall thickness of the cast metal portion, and it is difficult to form a required jacket hole having a large hole diameter due to the manufacturing method, and it is difficult to improve the heating / cooling performance.

As a method for forming a jacket, a large number of axial jacket holes are formed around the inner peripheral surface of the barrel of the barrel body by using a long-axis drill, and the end portions of the large number of jacket holes are heated. Some of them are designed to communicate with each other so as to circulate back and forth in the barrel axial direction, but even with this, the length of the drill is limited due to the processing restrictions (due to the drill length limit) due to the drill holes. It is not possible to manufacture a full-length barrel, and moreover, it cannot be applied to a spiral jacket having a smooth heat transfer passage and a small pressure loss.

Therefore, the main object of the present invention is to make it possible to manufacture a long jacketed barrel and to form a jacket having high heating / cooling efficiency.

[0009]

The technical means taken by the present invention to achieve the above-mentioned object is to provide a barrel body 1 with a jacket hole 19 for heat medium distribution extending from one axial end to the other axial end. In the method for manufacturing a barrel with a jacket, the barrel main body 1 is composed of an outer tubular member 2 and an inner tubular member 3 fitted inside so as to contact the inner surface of the outer tubular member 2, and A jacket hole 19 forming groove 8 is formed on the outer peripheral surface or the inner peripheral surface of the outer tubular member 2, and after the inner tubular member 3 is fitted into the outer tubular member 2, the inner tubular member 3 and the outer tubular member 2 are joined together. The point is that they are integrated by diffusion bonding with a hot isostatic pressing means.

Before the inner cylinder member 3 is fitted into the outer cylinder member 2, the lining pipe is inserted into the jacket hole 19 forming groove 8.
It is preferable that 10 is inserted and the pipe 10 is adhered to the inner surface of the jacket hole 19 by the pressure medium during the hot isostatic pressing process.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the barrel body 1 has an outer cylinder member 2
And an inner cylindrical member 3 fitted internally so as to be inscribed therein. As shown in FIGS. 2 and 3, the outer cylinder member 2 is a circular fitting for the inner fitting of the inner cylinder member 3 to a round steel material (square wood is also acceptable) such as SCM440 (normally structural carbon steel is used). It is formed by forming a joint hole 4 (with a dimensional tolerance of ± 0.5 to 1.0 ^mm ) and a long length (O.Dφ380 × IDφ280 × 800 ^l ). In addition, flanges are attached to both axial ends of the outer cylinder member 2.
5 are formed, and each flange 5 is formed with a vertical hole 6 penetrating in the radial direction. In addition, fitting portions 9a and 9b of the lid member are recessed on both end surfaces of the outer tubular member 2.

The inner cylinder member 3 is made of the same material as the outer cylinder member 2.
The outer shape is cylindrical as shown in FIGS. 4 and 5.
Is formed into the
A pair of through holes 7 (I, D φ87) are parallel (between the biaxial pitches is 46 m
m) and in a communicating manner (roughness of the inner surface of the through hole 7).
Degree: Rmax 10S). Also, on the outer peripheral surface of the inner tubular member 3,
A spiral jacket from one end to the other
Grooves for hole formation 8 (width: 14 ^mm, Depth: 12^mm, Pitch 50^mm)
Are formed.

The inner cylindrical member 3 has a spiral shape.
SUS304 L seamless steel by immersing in groove 8
Lining pipe 10 (O, D φ10.5^mm, meat
Thickness: 2.2 ^mmt) Is wound, and in this state, the inner cylinder member 3
It is fitted in the fitting hole 4 of the outer cylinder member 2 and is inserted into the groove 8 and the outer cylinder member 2.
A spiral jacket hole 19 is formed on the inner peripheral surface.
Both ends of this jacket hole 19 are attached to the outer cylinder member 2 respectively.
It connects to the vertical hole 6 formed in the lunge 5.
It At this time, the axially opposite side portions 10 of the lining pipe 10
a and 10b are recessed in the groove 8, and the both side portions 10a and 10b
Insert 10b into the vertical hole 6 as follows.

That is, first, the outer cylinder member 2 is fixed, the inner cylinder member 3 is rotated, and the end portion of the lining pipe 10 is inserted into the vertical hole 6
Match the inner open end of the. At this time, the tip of the lining pipe 10 is slightly inserted into the vertical hole 6 by the elastic restoring force of the pipe 10. Next, when the inner cylinder member 3 is reversely rotated little by little, the tip of the lining pipe 10 is guided to the inner surface of the vertical hole 6, and both side portions 10a and 10b of the lining pipe 10 are inserted into the vertical hole 6. . Therefore, the tip of the lining pipe 10 is formed in a tapered shape. Then, when the tip of the lining pipe 10 is slightly exposed from the vertical hole 6, it is pulled out by a tool.

Next, a cylindrical iron (carbon steel) sleeve
11 (O, D φ19 × I, D φ11 × 120 ^mm ) lining pipe
10 Fit on both ends 10a, 10b and insert into the vertical hole 6. Then, as shown in FIG. 7, the sleeve 11, the lining pipe 10 and the flange 5 are welded and fixed all around. Next, fit the lower lid 12 to the one fitting portion 9a of the outer tubular member 2,
The outer peripheral portion of the lower lid 12 is welded to the outer tubular member 2 over the entire circumference. After that, a core material 13 (SU
S304) is inserted into the inner cylinder member 3 and fitted and fixed in the fitting recess 14 formed on the inner surface of the lower lid 12. As shown in FIG. 6, the outer shape of the core metal 13 is formed so as to follow the inner surface shape of the inner cylinder member 3, and a uniform gap is provided between the outer surface of the core metal 13 and the inner surface of the inner cylinder member 3. It is formed.

Next, the Ni-based lining alloy powder 18 is filled in the gap between the core metal 12 and the inner cylinder member 3, and the upper lid 15 is filled.
Is fitted to the other fitting portion 9b of the outer tubular member 2, and the outer peripheral portion of the upper lid 15 is welded to the outer tubular member 2 over the entire circumference. The upper lid 15 is formed with a deaeration hole 16 and a fitting recess 17 for fitting and fixing the cored bar 12. In this state, air in the lining alloy powder 18 and air in all spaces such as the jacket hole 19 between the outer cylinder member 2 and the inner cylinder member 3 are degassed.
Vacuum degassed from 16 and then sealed in the HIP device,
HIP treatment is carried out for 5 hours under the conditions of temperature: 900 to 1000 ° C. and pressure: 1000 kgf / cm ² . At this time, the pressure of the pressure medium gas of the HIP device acts on the inner surface of the lining pipe 10, and the pipe 10 is expanded and deformed to adhere to the inner surface of the groove 8, the outer surface of the outer tubular member 2, the inner surface of the sleeve 11, etc., and diffusion bonded. To be done. Therefore,
As shown in FIG. 8, the inner surface of the jacket hole 19 is lined by the lining pipe 10 (thickness: 1.0 to 1.2).
^mmt ). Further, the lining alloy powder 18 is deposited on the inner surface of the inner cylindrical member 3 to obtain a lining layer having a uniform wall thickness.

After the HIP treatment, the furnace is cooled, the upper lid 15 and the lower lid 12 are removed by cutting, the cored bar 13 is pulled out, the inner surface of the barrel body 1 (the inner surface of the lining layer) is polished, and the outer peripheral portion of the barrel body 1 is processed. And get the finished product. As described above, the square spiral jacket (inner hole width: 12 ~ 12.4 ^mm , height: 9.8 ~
10 ^mm) long with a (full-length _{^{770 mm (L / D = 10}} )) biaxial composite barrels (one inner diameter: φ77 ^mm, twin-screw pitch 46 ^mm,
Lining layer thickness: 3.0 ^mm ) is produced.

It should be noted that the numerical values in the above-described embodiments are merely examples, and the present invention is not limited to these and various changes can be made. Further, the cross-sectional shape of the jacket hole forming groove 8 is not limited to the rectangular shape, and may be formed in any shape, and the groove may be formed on the inner peripheral surface of the outer tubular member 2.

[0019]

According to the present invention, the barrel body 1 is composed of the outer cylinder member 2 and the inner cylinder member 3 fitted inside so as to be in contact with the inner surface of the outer cylinder member 2. A jacket hole 19 forming groove 8 is formed on the outer peripheral surface or the inner peripheral surface of the outer tubular member 2,
After the inner cylinder member 3 is fitted into the outer cylinder member 2, the inner cylinder member 3 and the outer cylinder member 2 are integrated by diffusion bonding by a hot isostatic pressing means to manufacture a barrel with a jacket. As a result, a long barrel with a jacket, which cannot be achieved by the conventional technique, can be provided at low cost and with high quality.

Moreover, since the cross-sectional shape of the jacket hole 19 can be arbitrarily set, it is possible to form a jacket having high heating / cooling efficiency and low pressure loss, which has been difficult in the conventional manufacturing. Before the inner cylinder member 3 is fitted into the outer cylinder member 2, the pipe 10 for lining is inserted into the groove 8 for forming the jacket hole 19, and the pipe 10 is attached to the inner surface of the jacket hole 19 by the hot isostatic pressing means. By covering the jacket hole 19 with any desired cross-sectional shape, the jacket hole 19 having a lining with a uniform thickness can be obtained at all times.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of a barrel before an HIP process showing an embodiment.

FIG. 2 is a cross-sectional view of an outer cylinder member.

FIG. 3 is a view seen from an axial direction of an outer cylinder member.

FIG. 4 is a side view in which a lining pipe is wound around an inner cylinder member.

FIG. 5 is a view seen from the axial direction of the inner cylinder member.

FIG. 6 is a view seen from the axial direction of the barrel before HIP processing.

FIG. 7 is a sectional view of a jacket hole entrance / exit portion.

FIG. 8 is a cross-sectional view of a jacket hole after HIP processing.

FIG. 9 is a sectional side view showing a state in which a pipe is wound around a core showing a conventional example.

FIG. 10 is a cross-sectional view showing a state where a core with a pipe is set in a mold showing a conventional example.

FIG. 11 is a cross-sectional view of a finished barrel product showing a conventional example.

[Explanation of symbols]

 1 Barrel body 2 Outer cylinder member 3 Inner cylinder member 8 Groove 10 Lining pipe 19 Jacket hole

Claims (2)

[Claims] 1. A method of manufacturing a barrel with a jacket, wherein the barrel body (1) is provided with a jacket hole (19) for heat medium distribution from one end side to the other end side in the axial direction, the barrel body (1) comprising: , The outer cylinder member (2) and this outer cylinder member (2)
The inner cylindrical member (3) is fitted into the inner cylindrical member (3) so as to be in contact with the inner surface of the inner cylindrical member (3) or the outer peripheral member (2). 8) forming the inner cylinder member
(3) is fitted in the outer cylinder member (2), and then the inner cylinder member (3) and the outer cylinder member (2) are integrated by diffusion bonding by a hot isostatic pressing means. Manufacturing method of barrel with jacket. 2. A lining pipe (10) is inserted into the jacket hole (19) forming groove (8) before the inner cylinder member (3) is fitted into the outer cylinder member (2), and heat is applied. 2. The method for manufacturing a barrel with a jacket according to claim 1, wherein the pipe (10) is adhered to the inner surface of the jacket hole (19) by the pressure medium during the isotropic pressure treatment.