JPH03207802A - Manufacture of lined cylinder with side hole - Google Patents

Abstract

PURPOSE:To prevent development of unpacked part of powder for lining by packing the powder for lining into gap between a vertical hole and a side hole communicated with the vertical hole and a core and degassing from a degassing tube communicated with upper part of gap in the side hole. CONSTITUTION:The vertical hole 2 for biaxial screw hole and the side hole 3 for hopper or bend hole communicated with the hole 2 are opened to cylindrical raw material 1. The cores 6, 7 for lining vertically installed to a lower cover 8 and side cover 9 with gaps 4, 5, respectively, are fitted. The powder 13 for lining of alloy, etc., having excellent corrosion resistance and wear resistance, supplied through a supplying tube 12 and a supplying hole 11, is packed into the above gaps 4, 5. Successively, after pressing and sealing the supplying tube 12, the degassing is executed from the degassing tube 16 communicated with the upper part of gap 5 in the side hole 3, and this tube is pressed and sealed. By this method, the unpacked part of powder 13 is not developed in the above gaps 4, 5. After that, the hot isopressurizing is executed to this capsule and the lined cylinder attaching side hole and having uniform lining is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing cylinders used in kneading, extrusion, and shaping equipment for plastics, ceramics, magnetic powders, and metal powders.

(Prior art) The functions required of a segment type twin-shaft cylinder, which is normally used in kneading and extrusion forming equipment for plastic raw materials, include raw material supply, kneading, degassing, reaction, and extrusion. , each deaeration part has a hopper hole and a vent hole.

On the other hand, when molding flame-retardant plastics, plastics containing hard particles, ceramics, magnetic powders, and metal powders, the inner surfaces of the screw hole, hopper hole, and vent hole of the cylinder are required to have a high degree of corrosion resistance and wear resistance.

In order to satisfy these required characteristics, there is a method of lining the inner surfaces of screw holes, hopper holes, and vent holes by thermal spraying or overlaying with CO and Ni-based self-fluxing alloys. but,
The following problems remain.

l) In the case of small-diameter screw holes, complex-shaped hopper holes, vent holes, etc., there are dimensional restrictions during construction such as thermal spraying and overlaying cannot be performed.

2) There are many control conditions in the fusing process after thermal spraying, which tends to cause variations in the lining layer, and since it is a cast structure, segregation is significant to some extent and crystallized substances become coarse. Therefore, the strength and toughness of the lining layer are not good, and the corrosion resistance and abrasion resistance are also uneven.

3) Excessive tensile stress remains due to shrinkage of the lining due to melting and solidification, and in the case of large or complex shapes, the lining alloy may crack.

Therefore, in recent years, with the progress of high temperature/high pressure technology, a method for forming a lining layer that solves the problems of the above-mentioned lining method has been proposed. This method applies hot isostatic pressing (hereinafter referred to as HIP) when forming the lining layer.

Figures 3 and 4 show the OHI for implementing this method.
A capsule for P is shown, in which a cylindrical cylinder material 1 has a vertical hole 2 for a twin screw hole and a vertical hole 2 communicating with the vertical hole 2.
A horizontal hole 3, which is the basis of a hopper hole or a vent hole, is opened, and a vertical hole lining core 6 is provided in the vertical hole 2 and the horizontal hole 3 with gaps 4 and 5 for forming a lining layer.
And a core 7 for lining the horizontal hole is attached. The cores 6 and 7 are vertically installed on the lower cover 8 and the side cover 9, and are TIG welded to the lower end of the vertical hole 2 and the open end of the horizontal hole 3 of the cylinder material 1. In addition, an upper part 1110 is welded to the upper opening of the cylinder material 1, and the supply hole 11 for lining powder is passed through the upper part 1110.
is welded. The cylinder material is usually carbon steel, Cr-Mo steel, Ni-Cr-Mo steel, SuS3
It is made of grade 16 stainless steel, and the core, lid, etc. are made of carbon steel and stainless steel.

To form the lining layer by HIP, the HI
A lining powder 13 made of alloy or ceramic powder with excellent corrosion resistance and wear resistance is filled into the gaps 4 and 5 from the supply pipe 12 of the P capsule, and after degassing from the supply pipe 12, the powder is crimped. Seal and apply H[P treatment. By HIP, the lining powder is sintered and integrated, and is diffusion bonded to the inner surfaces of the vertical holes 2 and the horizontal holes 3, thereby forming a lining layer. Thereafter, the core is removed and the product shape is defined by finishing processing.

(Problem to be Solved by the Invention) However, when the horizontal hole 3 for forming the hopper hole or the vent hole is deep, the gap 5 for lining cannot be sufficiently filled with powder, and the unfilled portion 14 and the unlined portion Parts are likely to occur. In my experience, the following cases are particularly noticeable.

(L3 + L4)/2≧(Ll+L2)/2L1...
・Maximum radius L2 of the screw part of the vertical hole lining core...Width of the screw connection part of the same core XL3.
... Length of the horizontal hole from the maximum radius position of the screw part of the same core L4 ... Length of the horizontal hole from the end of the screw connecting part of the same core The cause of the unfilled part L4 is the rest of the powder. This is thought to be due to the fact that the angle is usually less than 150°, and the air forced in during atmospheric filling acts as resistance.

To improve this, we created another supply pipe on the horizontal hole side, first filled the powder from the vertical hole supply pipe, then turned the HIP capsule 90" horizontally, and then filled the powder again from the horizontal hole supply pipe. In this case, it is thought that the powder in the side hole can be filled.However, in this case, the capsule should be 90" deep for filling.
The powder must be filled twice on its side, and because it is placed on its side 90", there is a risk that the initially filled powder will be non-uniform.

Therefore, it is unsatisfactory economically and in terms of quality.

The present invention was made in view of this problem, and even if the horizontal holes are deep, no unfilled portions of the lining powder occur, and therefore a uniform lining layer can be formed not only in the vertical holes but also in the horizontal holes. The purpose is to provide a means.

(Means for Solving the Problems) The present invention, which has been made to achieve the above object, has a vertical hole 2 for a screw hole in a cylinder material 1 and a horizontal hole 3 for a horizontal hole or vent hole communicating with the vertical hole 2. is formed, and a vertical hole lining core 6 and a horizontal hole lining core 7 are installed in the vertical hole 2 and the horizontal hole 3 with gaps 4 and 5 for forming a lining layer, respectively. A capsule for isostatic pressure is prepared, and the gaps 4 and 5 are filled with lining powder from the upper opening of the vertical hole 2, degassed and sealed, hot isostatic pressure is applied, and then the core is removed. In this method, a degassing pipe 16 communicating with the upper part of the gap 5 between the horizontal hole 3 and the horizontal hole lining core 7 is attached to the capsule, and the lining is finished into a product shape. The purpose of the invention is to degas from the degassing pipe 16 after filling the powder.

(Examples and Effects) First, an example of a HIP capsule used to carry out the present invention will be described based on FIG. 1. For organizational reasons, parts similar to those in the conventional Figure 3 are indicated by the same numbers.

This embodiment differs from the conventional capsule in that a degassing pipe 16 is provided on the side II9. That is, a degassing pipe 16 communicating with the upper part of the gap 5 between the lateral hole 3 and the lateral hole lining core 7 is fixed to the lateral cover 9 by TIG welding and protrudes outward from the capsule.

A rubber tube 17 is attached to the tip of the degassing tube 16 with a crimping band 18.
A crimping band 19 for closing the tube hole is detachably attached to the middle part of the rubber tube 17. As shown in detail in FIG. 2, a stopper 20 for preventing powder from flowing out is inserted into the degassing tube 16. The plug body 20 is usually made of metal, and the clearance between its outer diameter and the inner diameter of the degassing pipe 16 is preferably 0.5W or less. Reference numeral 21 denotes a retaining protrusion provided by caulking.

After manufacturing the above capsule, in order to confirm the soundness of the welded part, the rubber tube 17 is closed with a band 19, the supply tube 12 is evacuated as usual, the capsule is checked for leaks, and the He Leak amount is IX 10”
std. Make sure it is below cc/S.

Next, a method of implementing the present invention will be explained. First, the band 19 for closing the rubber tube is loosened to allow air to flow in through the rubber tube 17.

Next, the lining powder 13 is filled from the supply pipe 12,
After filling, the tip of the supply pipe 12 is crimped and closed by TIG welding. Thereafter, the air inside the capsule is degassed from the degassing tube 16 via the rubber tube 17, and after a predetermined period of time, the degassing tube 16 is crimped and the rubber tube 17 is removed.

Arrows in FIGS. 1 and 2 indicate crimping locations.

Then, the degassing tube 16 is cut on the distal end side of the crimped portion, and the tube end on the crimped portion side is closed by TIG welding.

When the air inside the capsule is degassed through the degassing pipe 16, since the degassing pipe 16 communicates with the upper part of the gap 5 between the horizontal hole 3 and the horizontal hole lining core 7, the powder is poured into this space. Deaeration progresses without suction. The sucked powder falls from the unfilled upper part to the lower part, filling the unfilled part. As a result, the unfilled portion is eliminated and the air is degassed at the same time. In addition, due to the plug body 20 installed in the degassing pipe 16,
Powder hardly flows out to the tube end side, and crimping can be easily performed.

As described above, the HI filled with lining powder
As in the past, the P capsule is subjected to finishing processing after HIP treatment to become a product.

Although it is convenient for the work to attach a rubber tube 17 with a band to the degassing tube 16, the rubber tube 17 is not necessarily required when carrying out the present invention.

When checking for leaks in the welded portion, the degassing pipe 16 may be closed with a suitable plug.

In addition, if a stopper 20 for preventing the powder from flowing out is inserted inside the degassing tube 16 as shown in FIG. 2, the powder will be difficult to flow out to the end of the tube, and a relatively short tube can be used. Although it makes crimping easier, it is not necessary. Such a plug body 2
If 0 is not provided, the length of the degassing pipe 16 may be increased. Furthermore, if the tube end is oriented upward so that no powder is present in the crimped portion, the length of the tube can be shortened.

Next, specific examples are listed.

Example 1 (1) Using the HIP capsule shown in FIG. 1, the following set of lining powders (atomized metal powder with a particle size of 147 μm or less) was filled and degassed using the method described above. The material of each part is SCM440 for the cylinder material, natural rubber for the rubber tube, micro gear hose band for the compression band, and SCM440 for the other parts.
It is S41.

For comparison, powder was filled and degassed using the conventional capsule shown in FIG. 3 and a capsule equipped with a supply pipe for the horizontal hole communicating with the gap between the horizontal holes.

In the latter case, after feeding the powder from the supply pipe for the upper vertical hole, 9
It was turned horizontally at 0° and was further supplied to the gap in the horizontal hole 3 from the supply pipe for the horizontal hole. The capsule material is the same as in the example.

Table 1 shows the dimensions of the capsules used; Hiro 1 to 4 are examples, Nα5 is a conventional example, and Nα5 is a conventional example. 6 is a comparative example using a capsule equipped with a supply pipe for horizontal holes.

In addition, the L5 dimension in the same table is the length from the opening end of the horizontal hole to the end of the plug body (see FIG. 2).

0 lining powder (wt%) C:Q. 5-1.5%, Si: 1.0-2.0% B:
0.5~2.5%, Ni: 10~20% Cr: 20~
30%, W: 10-20% Cu: 0.
5-2.0% Remainder: Co and inevitable impurities Table (2) After filling with powder and degassing, seal and heat to 960°C, 1
HIP treatment was performed at 000 kg/cil for 3 hours. After that, finishing processing was performed to obtain a product.

(3) When the performance was investigated, the lining condition of the vertical hole for the screw hole was good with a uniform lining layer formed for all Na L to 5, but what about Na 6? The lining was uneven. On the other hand, the lining condition of the horizontal hole was good in Example kl~4, but there was an unlined part in Nα5.

Example 2 A similar test was conducted using ceramicinx powder as the raw material powder.

The capsule used was the NαL capsule shown in Table 1. Cera-based Tux powder has 3 moles Y, 0, - Zr
It is O■ (PSZ). After filling the above powder, 13
After 2-hour HIP treatment at 00''C and 1500 kg/cd, the performance was investigated after finishing processing, and the results showed that the lining layer was solidified with a density of 100%, and the lining condition of the horizontal holes was also good.

(Effects of the Invention) As explained above, according to the method for manufacturing a composite cylinder with horizontal holes of the present invention, after filling a HIP capsule having a cylinder material with lining powder, the upper part of the lining gap of the horizontal hole is Since the air inside the capsule is degassed through the connected degassing pipe, the powder that was sucked in with the air during degassing can be reliably filled into the unfilled part of the powder that occurs at the top of the gap in the side hole. This makes it possible to eliminate unfilled portions and prevent the formation of unlined layers.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a HIP capsule for implementing the present invention, Fig. 2 is an enlarged sectional view of a degassing pipe attachment part, Fig. 3 is a sectional view of a conventional HIP capsule, and Fig. 4 is a sectional view of a conventional HIP capsule. Figure 3 A-
It is an A-line sectional view. l...Cylinder material, 2...Vertical hole, 3...Horizontal hole,
4... Gap, 5... Gap, 6... Core for vertical hole lining, 7... Core for horizontal hole lining, 16... Degassing pipe. Patent Applicant: Kobe Steel, Ltd. No. 3m Figure 7 Figure 2

Claims (1)

[Claims] (1) Vertical hole for screw hole (2) in cylinder material (1)
A hopper hole or a horizontal hole (3) for a vent hole is formed in communication with the vertical hole (2), and a gap (4) for forming a lining layer is formed in the vertical hole (2) and the horizontal hole (3). (
5) is prepared, and a hot isostatic pressing capsule is equipped with a vertical hole lining core (6) and a horizontal hole lining core (7), separated by Manufacture of a composite cylinder with horizontal holes by filling the gaps (4) and (5) with lining powder, degassing and sealing, applying hot isostatic pressure, then removing the core and finishing it into the product shape. In the method, a degassing pipe (16) communicating with the upper part of the gap (5) between the horizontal hole (3) and the horizontal hole lining core (7) is attached to the capsule, and after filling with the lining powder, The degassing pipe (
16) A method for producing a composite cylinder with horizontal holes, which is characterized by more degassing.