JPS61180633A - Production of cylinder sleeve for internal combustion engine - Google Patents

Abstract

PURPOSE:To obtain the cylinder sleeve of high quality having sufficient stiffness by winding a high tensile wire rod spirally to casting body after reforming it in the coil shape of smaller diameter than the outer diameter of cylindrical casting body, then by brazing the both. CONSTITUTION:The annular recessed part 5 having the width W is provided on the outer peripheral face of the cylindrical casting body 3 made of cast iron and spiral guide groove 5a is machined on the bottom face of the recessed part 5. After the high tensile wire rod 4 the wind starting end of which is fixed to the cast body 3 being reformed in the coil shape having smaller diameter than the outer diameter of the cast body 3, it is wound spirally along the guide groove 5a. The wire rod 4 becomes the necessary cylinder sleeve 2 by being integrated with joining to the cast body 3 by brazing filler metal 6. The production of the cylinder sleeve of high quality having sufficient stiffness is thus enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Object of the Invention (1) Industrial Application Field The present invention relates to a method for manufacturing a cylinder sleeve to be cast into a cylinder block of an internal combustion engine.

(2) Prior art The present applicant first proposed a cylinder sleeve in which a high-tensile wire was wound around the outer circumferential surface of a thin-walled cylindrical cast body in order to reduce the weight and increase the rigidity of the cylinder sleeve. (See Japanese Patent Application No. 59-253682).

Conventionally, the cylinder sleeve is manufactured using the following process.

That is, the end of the winding start of a straight high-tensile wire rod is fixed to the outer peripheral surface of the cast body, the high-tensile wire rod is then spirally wound around the cast body, and then the end of the winding of the high-tensile wire rod is fixed to the outer peripheral surface of the cast body. The process involves a winding process in which the wire is fixed to the wire, and a process in which the cast body and the high-tensile strength wire are brazed together.

(3) Problems to be solved by the invention However, when straight high-tensile wire rods are wound around a cast body as described above, the bending radius of the high-tensile wire rods is large, so the amount of springback of the wire rods is large. As a result, a large gap may be created between the cast body and the high-tensile wire rod, and in such a state, it becomes impossible to reliably join the cast body and the high-tensile wire rod throughout in the next brazing step.

As a result, there is a problem in that it is not possible to stably obtain a high-quality cylinder sleeve with sufficient rigidity that can achieve composite reinforcement through the cooperation of the cast body and the high-tensile wire rod.

In view of the above, it is an object of the present invention to provide a manufacturing method capable of reliably joining a cast body and a high-tensile wire rod over the entirety and stably obtaining a high-quality cylinder sleeve having sufficient rigidity. purpose.

B1 Structure of the Invention (1) Means for Solving the Problems This invention involves fixing a winding start end of a high-tensile wire rod to the outer peripheral surface of a cylindrical casting body, and then fixing the high-tensile wire rod to the outer peripheral surface of the casting body. a winding step of forming a coil into a coil having a diameter smaller than the outer diameter and then spirally winding it around the cast body, and then fixing the winding end of the high tensile wire rod to the cast iron body; It is characterized by using the step of brazing the high tensile strength wire.

(2) Effect According to the above method, the diameter of the high-tensile wire rod is expanded in the winding process and is wound around the cast body. In the welding step, the cast body and the high-tensile wire rod are reliably joined throughout.

(3) Example 1. Figure 2 shows aluminum alloy cylinder block 1.
The cylinder block 1 has four cylinder sleeves 2 cast in series.

Each cylinder sleeve 2 has a third cylinder sleeve. As clearly shown in FIG. 4, it consists of a cylindrical cast body 3 made of cast iron and a high-tensile wire rod 4 wound helically around the outer peripheral surface of the cast body 3.

The high-tensile wire 4 is wound around a spiral guide groove 5α formed on the bottom surface of an annular recess 5 having a width W of approximately one-third of the total length from the cylinder head side end of the cast body 3. and is joined to the cast body 3 with a brazing filler metal 6.

Next, a method of manufacturing the cylinder sleeve 2 will be explained with reference to FIGS. 5 to 8.

First, as shown in Figure 5, cast iron (JIS FC30
) is cast, an annular recess 5 having the width W is formed on its outer peripheral surface, and a spiral guide groove 5σ is formed on the bottom surface of the recess 5.

Next, as shown in FIGS. 6A and 6B, the cast body 3 is placed over the upper surface of the rotary knurple 7 with its recess 5 facing downward. This rotary table 7 is rotated by a motor (not shown). The high tensile strength wire 4 has a diameter of 1. OJ! Spring piano wire (JIS 5WP4) is passed between a pair of feed rows 28, and between the feed roller 8 and the rotary table 7, an idle-rotating forming roller 9? The wire is wound once around the molded part 9a, and the starting end 4a of 40 turns of the high-tensile wire is fixed to the starting end of the guide groove a of the cast body 3 by TIG welding. Molding part 9
The outer diameter d of a is set smaller than the outer diameter at the bottom of the guide structure 5a of the cast body 3.

Then, in FIG. 6B, the rotary table 7 and therefore the cast body 3 are rotated clockwise, and the high-tensile wire 4 is fed by both feed rollers 8 toward the forming roller 9 at the same speed as the winding speed of the cast body 3. The high-tensile wire 4 sent to the forming roller 9 is shaped by the roller 9 into a coil shape with a smaller diameter than the outer diameter at the bottom of the guide groove 5a of the body 3, and then expanded to form a coil into the cast body 3. Adjacent wire rods 4 are wound spirally along the guide groove 5α so as to be in close contact with each other. By expanding the diameter of this high-tensile wire rod 4, the wire rod 4 is inserted into the guide groove 5.
Make sure to adhere to a.

In this case, if the winding speed of the cast body 3 is faster than the feed speed of the high-tensile wire rod 4, the winding of the high-tensile wire rod 40 by the cast body 3 will be smooth and smooth, and the winding speed will be faster than the feed speed. If it is too slow, it becomes impossible for the forming roller 9 to form the shape.

After winding the high tensile strength wire 4 over the entire length of the guide groove 5a, the rotation of both feed rows 28 and the rotary table 70 is stopped, and the high tensile strength wire 4 is cut at the end position of the winding end.
b is fixed to the guide groove 5 and the end by TIG welding, and the seventh
The cylinder sleeve material 20 shown in the figure is obtained.

Thereafter, as shown in FIG.
is wound and fixed, and the material 20 is placed in the vacuum furnace 10. The raw material 20 is then heated at 1000° C. for 10 minutes and then at 1120° C. for 10 minutes to braze the high-tensile wire 4 and the cast body 3 to obtain the cylinder sleeve 2 shown in FIG. 3. In this case, since the bonding area is widened by the guide groove 5a, the bonding strength between the high-tensile wire rod 4 and the cast body 3 is increased.

The wax draining cylinder sleeve 2 is taken out from the vacuum furnace 10 and rapidly air cooled to complete the manufacturing operation.

FIG. 9 is a 100x micrograph showing the metallographic structure of the cylinder sleeve 2 obtained according to the present invention, and it can be seen that the cast body 3 and the high-tensile wire rod 4 are tightly joined via the brazing material 6. I understand.

The cast body 3 may be made of cast steel, and the high-tensile wire rod 4 may be wound over the entire length of the cast body 3 in the axial direction.

C0 Effects of the Invention According to the present invention, the high-tensile wire rod is twisted into a coil shape with a diameter smaller than the outer diameter of the cast body and then wound spirally around the cast body, so that the high-tensile wire rod covers the outer periphery of the cast body. The cast body and the high-tensile wire rod are reliably bonded to each other throughout the entire surface in the next brazing process. As a result, composite reinforcement is achieved through the cooperation of the cast body and the high-tensile wire rod, and a high-quality cylinder sleeve with sufficient rigidity can be stably obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a cylinder block using the cylinder sleeve obtained by the present invention, and Fig. 2 is Fig. 1 11-u.
A line sectional view, FIG. 3 is a longitudinal sectional front view of the main part of the cylinder sleeve obtained by the present invention, FIG. 4 is a partially enlarged view of FIG. 3,
5 to 8 show the manufacturing process of the present invention, FIG. 5 is a front view of the cast body, FIG. 6A is a front view of the winding process, and FIG. 6B
The figure is a cross-sectional plan view of the winding process. The figure is a T-side view of the cylinder sleeve material, Figure 1 is an explanatory view of the contacting process 0, and Figure 1 is a microscopic photograph showing the metal structure of the cylinder sleeve obtained by the present invention. 2... Cylinder sleeve, 3... Cast body, 4...
High tensile strength wire rod, 6... brazing metal, 7... rotary table,
8...Feed roller, 9...Forming roller 111^-! Figure 4 Figure 3 Figure 9t A

Claims (1)

[Claims] The end of the winding start of a high-tensile wire is fixed to the outer peripheral surface of the cylindrical cast body, and then the high-tensile wire is twisted into a coil shape having a smaller diameter than the outer diameter of the cast body, and then wound spirally around the cast body. A method for manufacturing a cylinder sleeve for an internal combustion engine, comprising: a winding step of fixing the winding end of the high-tensile wire rod to the cast iron body; and a step of brazing the cast body and the high-tensile wire rod.