JP2912652B2 - Manufacturing method of composite cylinder with lateral holes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a cylinder used in an apparatus for kneading and extruding plastic, ceramics, magnetic powder and metal powder.

(Prior art) Usually, functions required for a segment type twin-screw cylinder used in a kneading and extruding apparatus for plastic raw materials include raw material supply, kneading, deaeration, reaction and extrusion.
A hopper hole and a vent hole are provided in the material supply and deaeration portions of the cylinder, respectively.

On the other hand, when molding flame-retardant plastics, hard-particle-added plastics, ceramics, magnetic powders and metal powders, a high degree of corrosion resistance and abrasion resistance are required for the screw holes, hopper holes and vent holes of the cylinder.

In order to satisfy such required characteristics, there is a method of lining the inner surfaces of screw holes, hopper holes, and vent holes by thermal spraying or overlaying of a Co, Ni-based self-fluxing alloy. However, the following problems remain.

1) In the case of small diameter screw holes, hopper holes and vent holes with complicated shapes, there are dimensional restrictions on construction such as inability to spray or build up.

2) There are many control conditions in the fusing step after thermal spraying, the lining layer is likely to vary, and since it has a cast structure, component segregation is remarkable and the crystallized material becomes coarse. Therefore, the strength and toughness of the lining layer cannot be said to be good, and the corrosion resistance and wear resistance are also non-uniform.

3) Excessive tensile stress remains due to shrinkage of the lining part due to melting and solidification, and in the case of a large-sized and complicated shape, the lining alloy may be cracked.

Therefore, in recent years, with the development of high-temperature and high-pressure technology, a method of forming a lining layer has been proposed which solves the problems of the lining method. In this method, hot isostatic pressing (hereinafter referred to as HIP) is applied when forming a lining layer.

FIGS. 3 and 4 illustrate the HI for implementing this method.
FIG. 3 shows a capsule for P, which is connected to a vertical hole 2 for a biaxial screw hole in a cylindrical cylinder material 1 and the vertical hole 2;
A horizontal hole 3 serving as a base of a hopper hole or a vent hole is opened, and the vertical hole lining core 6 and the vertical hole lining core 6 are formed in the vertical hole 2 and the horizontal hole 3 through gaps 4 and 5 for forming a lining layer. A core 7 for side hole lining is mounted. The cores 6 and 7 are suspended from the lower lid 8 and the horizontal lid 9, and these are provided at the lower end of the vertical hole 2 and the open end of the horizontal hole 3 of the cylinder material 1.
G is welded. An upper lid 10 through which a supply hole 11 for lining powder is penetrated is welded to an upper opening of the cylinder blank 1, and a supply pipe 12 is welded to the supply hole 11. The cylinder material is usually carbon steel, Cr-Mo steel, Ni
-Made of stainless steel such as Cr-Mo steel and SuS316, and the core and the lid are made of carbon steel and stainless steel.

In order to form a lining layer by HIP, from the supply pipe 12 of the capsule for HIP, a lining powder formed of an alloy or ceramic powder having excellent corrosion resistance and wear resistance is provided.
The gap 13 is filled in the gaps 4 and 5, degassed from the supply pipe 12, pressed and sealed, and subjected to HIP processing. By the HIP, the lining powder is sintered and integrated, and diffusion bonded to the inner surfaces of the vertical holes 2 and the horizontal holes 3 to form a lining layer. After that, the core is removed and the shape of the product is formed by finishing.

(Problems to be Solved by the Invention) However, when the horizontal hole 3 for forming the hopper hole or the vent hole is deep, the powder cannot be filled in the gap 5 for the lining, and the unfilled portion 14 and thus the unlined portion are not filled. Easy to occur. Experience has shown that this is particularly significant in the following cases.

(L3 + L4) / 2 ≧ (L1 + L2) / 2 L1 ... Maximum radius of screw portion of core for vertical hole lining L2 ... 1/2 of width of screw connection portion of same core L3 ... Maximum radius position of screw portion of same core The length of the horizontal hole from the end L4 ... The length of the horizontal hole from the end of the screw connection part of the core The unfilled portion 14 is caused by the fact that the angle of repose of the powder is usually 150 ° or less, It is considered that the air that was pushed in at the time became the resistance.

As a remedy, another supply pipe is also provided on the side hole side,
It is considered that the powder in the horizontal hole portion can be filled by first filling the powder from the supply hole for the vertical hole, then turning the capsule for HIP 90 ° horizontally, and then refilling the powder from the supply tube for the horizontal hole. However, in this case, the capsule has to be filled 90 degrees and the capsule has to be filled twice, and since the capsule is filled 90 degrees, there is a possibility that the powder initially filled becomes non-uniform. Therefore, it is economically and unsatisfactory in quality.

The present invention has been made in view of such problems, even if the lateral hole is deep, the unfilled portion of the lining powder does not occur,
Accordingly, it is an object of the present invention to provide means capable of forming a uniform lining layer not only on the vertical holes but also on the horizontal holes.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cylinder material 1 in which a vertical hole 2 for a screw hole and a horizontal hole 3 for a hopper or vent hole communicating with the vertical hole 2 are provided. The hot hole isotropically provided with the vertical hole lining core 6 and the horizontal hole lining core 7 mounted on the vertical hole 2 and the horizontal hole 3 with gaps 4 and 5 therebetween for forming a lining layer. A capsule for pressurizing and pressurizing is prepared, the lining powder is filled into the gaps 4 and 5 from the upper opening of the vertical hole 2, degassed and sealed, and then hot isostatically pressurized. In a method of manufacturing a composite cylinder with a lateral hole, which is finished to a product shape, a degassing pipe 16 communicating with an upper part of a gap 5 between the lateral hole 3 and a core 7 for a lateral hole lining is attached to a capsule, After filling of the powder, degassing is performed through the degassing pipe 16. The it is an arrangement of the invention.

(Example and Function) First, an example of a capsule for HIP used to carry out the present invention will be described with reference to FIG. In addition, structurally the same as in FIG. 3 of the prior art is indicated by the same number.

This embodiment is different from the conventional capsule in that a degassing pipe 16 is provided in the side lid 9. That is, a degassing pipe communicating with an upper part of the gap 5 between the lateral hole 3 and the lateral hole lining core 7.
16 is fixed to the side cover 9 by TIG welding and protrudes outward from the capsule. A rubber tube 17 is fastened to the tip of the degassing tube 16 by a band 18 for crimping, and a band 19 for closing a tube hole is detachably attached to a middle portion of the rubber tube 17. As shown in detail in FIG. 2, a plug 20 for preventing powder from flowing out is inserted into the degassing pipe 16.
The plug 20 is usually made of metal, and the clearance between its outer diameter and the inner diameter of the degassing pipe 16 is preferably 0.5 mm or less. Reference numeral 21 denotes a retaining projection projected by caulking.

After the production of the capsule, in order to confirm the soundness of the welded portion, the rubber tube 17 was closed with a band 19, and the supply tube 12 was evacuated as usual, and the capsule was checked for leaks. Confirm that the leak amount is 1 × 10 ^-11 std.cc/S or less.

 Next, an implementation method of the present invention will be described.

First, the band 19 for closing the rubber tube is loosened so that air can flow through the rubber tube 17. Next, supply pipe
Fill the lining powder 13 from 12, and after filling, supply pipe 12
Is crimped and closed by TIG welding. Thereafter, the air in the capsule is evacuated from the degassing pipe 16 via the rubber pipe 17, and after a lapse of a predetermined time, the degassing pipe 16 is pressed and the rubber pipe 17 is removed. Arrows in FIGS. 1 and 2 indicate crimped portions. Then, the pipe is cut at the distal end side of the crimping section of the degassing pipe 16, and the pipe end on the crimping section side is closed by TIG welding.

When the air in the capsule is degassed from the degassing pipe 16, the degassing pipe 16 forms a gap 5 between the lateral hole 3 and the lateral hole lining core 7.
Because it communicates with the upper part of the space, deaeration proceeds while sucking powder into this space. The sucked powder fills the unfilled portion while falling from the unfilled upper portion to the lower portion.
Thereby, the elimination of the unfilled portion and the deaeration are simultaneously performed. In addition, the powder hardly flows out to the end of the pipe by the plug body 20 provided in the degassing pipe 16, so that the pressing can be easily performed.

HI filled with lining powder as described above
As in the past, the capsules for P are subjected to a finishing process after the HIP treatment to become products.

It is convenient for the operation to attach a rubber tube 17 with a band to the degassing tube 16, but the rubber tube 17 is not always necessary for carrying out the present invention. When checking for a leak at the welded portion, the degassing pipe 16 may be closed with an appropriate plug.

If a plug 20 for stopping powder outflow is inserted into the degassing pipe 16 as shown in FIG. 2, it becomes difficult for powder to flow out to the pipe end. Even though the crimping is easy, it is not always necessary. When such a plug 20 is not provided, the length of the degassing pipe 16 may be increased.
Further, if the pipe end is directed upward so that powder does not exist in the crimping portion, the pipe length can be shortened.

 Next, specific examples will be described.

Example 1 (1) Using the HIP capsule of FIG. 1, a lining powder (atomized metal powder having a particle size of 147 μm or less) having the following composition was filled and degassed by the above-described method. The material of each part is
The cylinder material is SCM440, the rubber tube is natural rubber, the crimping band is a microgear hose band, and the others are SS41.

For comparison, the powder was filled and deaerated using the conventional capsule shown in FIG. 3 and a capsule having a horizontal hole supply pipe communicating with the gap between the horizontal holes. In the latter case, after the powder was supplied from the upper supply pipe for the vertical hole, the powder was turned 90 ° horizontally and further supplied to the gap of the horizontal hole 3 from the supply pipe for the horizontal hole. The capsule material is the same as in the embodiment.

Table 1 shows the dimensions of the capsules used. Nos. 1 to 4 are examples, No. 5 is a conventional example, and No. 6 is a comparative example using a capsule provided with a supply pipe for a horizontal hole. The L5 dimension in the table is the length from the opening end of the horizontal hole to the end of the plug (see FIG. 2).

Lining powder (% by weight) C: 0.5 to 1.5%, Si: 1.0 to 2.0% B: 0.5 to 2.5%, Ni: 10 to 20% Cr: 20 to 30%, W: 10 to 20% Cu: 0.5 to 2.0% balance: Co and inevitable impurities (2) After filling and degassing the powder, seal it, 960 ℃, 1000kg / c
HIP treatment was performed at m ² , 3Hr. Then, finishing was performed to obtain a product.

(3) As a result of a performance survey, the lining condition of the vertical holes for screw holes was good because all of No. 1 to 5 formed a uniform lining layer, but the lining was uneven in No. 6 . On the other hand, the lining condition of the horizontal hole was good in Nos. 1 to 4 of the example, but in No. 5, an unlined portion was present.

Example 2 A similar test was performed using ceramic powder as a raw material powder.

The capsules used were the No. 1 capsules shown in Table 1. Ceramic powder is 3 mol Y ₂ O ₃ -ZrO ₂ (PS
Z). And after filling the above powder, 1300 ℃, 1500kg / c
After finishing the HIP treatment with m2 for ² hours and finishing, the performance was examined. As a result, the lining layer was solidified at a density of 100%, and the lining condition of the side holes was good.

(Effects of the Invention) As described above, according to the method for manufacturing a composite cylinder with a lateral hole of the present invention, after filling a lining powder into a capsule for HIP having a cylinder material, the HIP capsule is placed above the lining gap of the lateral hole. Since the air inside the capsule is degassed from the communicating degassing pipe, the unfilled portion of the powder generated at the upper part of the gap of the horizontal hole can be reliably filled with the powder sucked together with the air at the time of degassing, As a result, the unfilled portion can be eliminated, and the occurrence of the unlined layer can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a capsule for HIP for carrying out the present invention, FIG. 2 is an enlarged sectional view of a degassing pipe mounting portion, FIG. 3 is a sectional view of a conventional capsule for HIP, and FIG. FIG. 3 is a sectional view taken along line AA. 1 ... Cylinder material, 2 ... Vertical hole, 3 ... Horizontal hole, 4 ...
Gaps, 5: Gaps, 6: Core for vertical hole lining, 7:
... core for horizontal hole lining, 16 ... degassing pipe.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukitaka Mizuno 2-12-38, Yawata-cho, Shinminato-shi, Toyama (72) Inventor Keiichi Hayashida 4-26-302-302, Taikoyama, Kosugi-cho, Imizu-gun, Toyama References JP-A-63-219507 (JP, A) JP-A-62-235402 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22F 3/00-7/08 B29C 47 / 66

Claims (1)

(57) [Claims] A vertical hole (2) for a screw hole and a horizontal hole (3) for a hopper or vent hole communicating with the vertical hole (2) are formed in a cylinder material (1). And a hot hole having a vertical hole lining core (6) and a horizontal hole lining core (7) mounted in the horizontal hole (3) with gaps (4) and (5) therebetween for forming a lining layer. A capsule for isostatic pressing is prepared, and a lining powder is filled into the gaps (4) and (5) through the upper opening of the vertical hole (2).
A method of manufacturing a composite cylinder with a horizontal hole, which comprises degassing, sealing, hot isostatic pressing, and then removing the core and finishing the product into a product shape. A degassing pipe (16) communicating with the upper part of the gap (5) between the degassing pipe (1) and the lining powder is filled.
6) A method for manufacturing a composite cylinder with a lateral hole, characterized by further degassing.