JPS59192551A - Manufacture of double-cylinder cylinder with lining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lined twin cylinder.

In the cylinder of a twin-screw type resin processing machine that processes resin filled with ceramics, glass mfdt, asbestos, etc., or resin with flame retardant added to these,
A lining layer is provided on the inner surface of the sill to improve corrosion resistance and abrasion resistance. One conventional method for forming a lining layer on a twin-cylinder cylinder is to form the lining layer by centrifugally casting a corrosion-resistant and wear-resistant material on the inner diameter of each cylindrical member, and place each cylindrical member at its center. There is a method of cutting longitudinally along a plane parallel to the axis and removing a part of it, then overlapping the remaining longitudinal sections of the cylindrical member with each other, and joining the mating surfaces by gas welding, electric welding, electron beam welding, etc. . In order to prevent the lining layer from cracking due to heat effects during welding, the vicinity of the lining layer was not welded.

However, in twin cylinders manufactured using conventional methods, the mating surfaces near the lining layer are not joined, so corrosive substances generated from the resin material can enter through the mating surfaces, causing corrosion of the lining member. In some cases, problems such as the lining layer caving in occurred.

In order to solve the carp problem, the applicant has
No. 200762 ``Method for manufacturing twin cylinder with lining'' (filed on June 2, 1981) discloses a method in which the outer periphery of the mating surfaces is electron beam welded and the inner periphery is brazed. However, waxing cannot completely bond the mating surfaces, leaving about 40% of the unbonded area, and the problem of corrosion could not be completely solved.

The present invention has been made by focusing on the above-mentioned problems in the conventional manufacturing method of twin cylinders with linings. The aim is to further improve corrosion resistance by seal welding weldable materials together.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 6 of the accompanying drawings showing embodiments thereof.

First, as shown in FIG. 1, weldable material 12 (for example, 5US309) is overlay-welded to two predetermined positions on the inner diameter of the cylindrical member 10 over the entire length in parallel to the central axis. Next, as shown in FIG. 2, a reinforcing material (corrosion-resistant and wear-resistant nickel-based self-fusing alloy, cobalt-based self-fusing alloy, iron chromium boride, etc.) is added to the inner diameter of the cylindrical member 10, and a nickel-based matrix material is added to the inner diameter of the cylindrical member 10. The lining layer 14 is formed by centrifugally casting a composite material consisting of a self-fusing alloy and a cobalt-based self-fusing alloy. By doing this, the lining layer (-1) cylindrical member 16 is obtained.Next, as shown in FIG. Next, this cylindrical member 16 with a lining layer is longitudinally sectioned along a plane parallel to the central axis and passing through the two weldable materials 12 as shown in FIG. 4, and two parts 16a and 16b are obtained.
The small circular arc side portion 16b of the cross section in the direction perpendicular to the axis is removed. Two large arc side portions 16a as described above are created, and their longitudinal sections are overlapped with each other as shown in FIG. In the overlapping state, the weldable materials 12 come into contact with each other. Next, the mating surfaces are joined from the outer peripheral side by electron beam welding or laser beam welding. Further, the contact surfaces of weldable materials that are in contact with each other are joined by seam welding. Next, the external shape of the joined cylinder body is machined into a desired shape, as shown in FIG. 6, to complete the twin-tube cylinder 18.

Twin cylinder cylinder 1 obtained by the above manufacturing method
In 8, a weldable material is applied in advance to the contact surfaces of the lining layers 14, and the weldable material is joined by seam welding, so that the contact surfaces can be completely joined. Therefore, it is possible to reliably prevent corrosive substances from entering through the mating surfaces, and corrosion of the lining member can be prevented. In addition, the contact portion between the lining layers 14 has an acute-angled shape and is a weak portion in terms of strength.
In addition, wear-resistant lining materials are generally brittle materials, but by applying a suitable tough welding material, the strength is improved and the risk of breakage is reduced.

As explained above, according to the present invention, a weldable material is overlay-welded to two predetermined positions on the inner diameter of each of two cylindrical members in parallel to the central axis over the entire length of the cylindrical member, and then the inner diameter of both cylindrical members is welded. Each of the cylindrical members with the lining layers is cut longitudinally along a plane passing through the two weldable material build-up parts, and the small arc side part of the cross section in the direction perpendicular to the axis is removed. The arcuate side parts are stacked on top of each other in their longitudinal sections, and the mating surfaces are welded together, and the weldable materials are seal welded to form a twin-tube cylinder, so the mating surfaces near the lining layer are completely joined. This results in the effect that the corrosion resistance of the lined twin cylinder can be significantly improved. Furthermore, the strength of the mating surfaces is also improved.

[Brief explanation of the drawings] Figure 1 is a cross-sectional view of a cylindrical member overlaid with weldable material;
The figure is a cross-sectional view of a cylindrical member lined with a lining layer.
The figure is a cross-sectional view of the cylindrical member after internal diameter machining, Figure 4 is a cross-sectional view of the cylindrical member after longitudinal machining, Figure 5 is a cross-sectional view of the two large arc side parts shown in Figure 4 joined together, Figure 6 is a cross-sectional view of the completed twin-tube cylinder. 10...Cylindrical member, 12...Weldable material, 14φ-
ψ lining layer, 16, cylindrical member for the lining layer, 16a...large arc side part, 16b...small arc side part, 18...double cylinder. Patent Applicant Nikki Steel Co., Ltd. Agent Patent Attorney Toshiyuki Miyauchi Figure 1 Figure 8 Figure 6 Figure 4 Figure 5 6th Part 8

Claims (1)

[Claims] A weldable material is overlay-welded to two predetermined positions on the inner diameter of each of the two cylindrical members in parallel to the central axis over the entire length of the cylindrical member, and then a lining layer is lined on the inner diameter of each of the two cylindrical members, and both linings are lined with a lining layer. Layer 4 = 1 cylindrical member is longitudinally sectioned along a plane passing through two weldable material build-up parts, the small arc side portion of the cross section in the direction perpendicular to the axis is removed, and both large arc side portions are removed in the longitudinal section. A method for manufacturing a twin-tube cylinder with a lining, which is made into a twin-tube cylinder by overlapping each other, welding the mating surfaces, and seal-welding the weldable materials together.