JP3022654U - Cylinder cover touch repair surface - Google Patents

Abstract

(57) Abstract: In a cylinder cover with many cooling holes, it is possible to eliminate the crack inspection and the recurrence of cracks that require a great deal of time and labor. SOLUTION: Along the circumference of the touch surface A of the cylinder cover 1, a ring shape is removed from the side of the touch surface A to a semicircular portion of the circular cross section of the cooling hole 3 or a thickness reaching the full circular portion. A semicircular shape of the circular cross section of the cooling hole 3, which is annular in the touch repair surface welding hole 4 forming the touch repair surface welding hole 4
Alternatively, the touch repair surface 2 made of corrosion-resistant and heat-resistant metal having a thickness reaching the entire circular portion is formed by overlay welding, and the cooling hole 3 is re-drilled.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a repair surface of a fire surface of a cylinder cover of a land or marine diesel engine.

[0002]

[Prior art]

 Conventionally, when repairing cracks on the touch surface of a cylinder cover, the cracks are removed with a grinder, a pipe with the same outer diameter as the cooling hole diameter is inserted into the cooling hole, and repair is performed by overlay welding. Or, only the cracked part is welded and repaired.

[0003]

[Problems to be solved by the device]

 Conventionally, a cylinder cover of the type (Boer Cooling type) in which a large number of cooling water holes are radially formed from the center of the cylinder cover has many advantages such as cooling capacity and horsepower, but it does not cool when used for a long time. The bottom of the water hole corrodes, and it is difficult to find cracks in the corroded part by inspection from the touch surface side (color check, magna flux check, ultrasonic flaw detection, etc.). In order to inspect for the presence of the cylinder cover, it is annealed together with the stress relief of the cylinder cover, the interior is cleaned, and the interior of the endoscope is carefully checked for the presence of cracks. However, once corrosion begins, cracks will occur in other parts that have not yet been implemented, and repairs will have to be performed again, increasing the number of repairs, requiring a great deal of labor and cost, and further driving the engine. Pause Loss, etc. between also has a problem of increasing.

The present invention has been made in view of the above problems of the conventional technology, and an object of the present invention is to make it possible to eliminate the troublesome inspection and repair recurrence. It is intended to provide a touch protection surface for a cylinder cover.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the touch protection surface of the cylinder cover in the present invention has a thickness that reaches the cooling hole from the touch surface side along the circumference of the circular touch surface viewed from the touch surface of the cylinder cover. After removing it in a ring shape, it is welded in an annular shape with a corrosion-resistant and heat-resistant metal to the portion, and the cooling hole is re-punched to form the touch repair surface of the cylinder cover.

[0006]

[Action]

 In the touch-sensitive repair surface, all parts of the touch-sensitive surface where cracks are most likely to occur are regenerated as corrosion-resistant and heat-resistant metal, thus promoting the life extension of the cylinder cover.

[0007]

[Embodiment of device]

 1 to 3, the touch repair surface 2 of the cylinder cover 1 extends along the circumference of a conventional touch surface A, which is formed in a circular shape with a constant width when viewed from the touch surface side of the cylinder cover. Overlay welding is performed using a corrosion-resistant and heat-resistant metal in an annular shape having a thickness reaching the cooling hole 3 from the touch surface (from the lower surface side in FIG. 1). As the corrosion-resistant and heat-resistant metal for carrying out the present invention, for example, an alloy of nickel-chrome or chrome-molybdenum steel may be used.

Next, a method for forming the touch repair surface 2 of the cylinder cover will be described in detail below. The cylinder cover 1 is annealed in an annealing furnace, placed on a retouching machine with the fire side facing toward the cutting blade, and an annular shape with a thickness reaching the cooling hole 3 from the touch side along the circumference of the fire surface. To form the welded hole 4 for the touch repair surface. In this case, deleting in a circular shape having a thickness reaching the cooling hole 3 means deleting up to the semicircular portion of the circular cross section of the cooling hole 3 (up to 1/2 of the hole diameter) and deleting the entire circular cross section of the cooling hole 3. Means both when deleting.

The cooling hole 3 is circularly removed along the circumference from the touch surface side to a position reaching the semicircular portion of the circular cross section of the cooling hole 3, and after forming the touch repair surface welding hole 4, the diameter is the same as the cooling hole diameter. The pipe 5 is inserted into the cooling hole 3 (see FIG. 4), and the removed portion is welded to the entire circumference by overlay welding by hand or by an automatic welding machine, and the cooling hole 3 After forming the corrosion-resistant and heat-resistant metal touch repair surface 2 with a thickness that reaches the depth of the semi-circular portion of the circular cross section, the cooling hole 3 is re-punched and perforated to complete the present invention. .

[0010]

【Example】

 From the touch surface side to the depth of the semi-circular part of the circular cross section of the cooling hole 3 is removed annularly along the circumference of the touch surface, and after forming the touch repair surface welding hole 4, the remaining 1 of the cooling hole 3 The semi-circular undeleted part of 2 is manually welded to fill the hole with corrosion-resistant and heat-resistant metal, and then the deleted part is welded to the entire circumference by overlay welding to form the cooling hole 3. After forming the touch-resistant repair surface 2 made of a corrosion-resistant and heat-resistant metal having a reached thickness, the cooling hole 3 is re-drilled.

As yet another embodiment, as shown in FIG. 5, the cooling hole 3 is removed in a ring shape along the circumference of the touch surface from the side of the touch surface to a depth at which the entire circular cross section of the cooling hole 3 is removed. Repairing by touching all the removed parts after forming the surface welding hole 4 by hand and by using an automatic welding machine, build-up welding with heat-resistant metal, ring-shaped and corrosion-resistant up to the cooling hole 3 After forming the touch-resistant restoration surface 2 made of heat-resistant metal, the cooling holes 3 are perforated by re-punching.

[0012]

【effect】

 In a cylinder cover with many cooling holes, it is possible to completely eliminate the crack inspection and the recurrence of the crack, which requires a lot of time and labor, and it is very economically effective.

[Brief description of drawings]

FIG. 1 is an enlarged view of a part of a touch repair surface applied to a cylinder cover, which is vertically cut and cut away.

FIG. 2 is a bottom view of the cylinder cover seen from the touch repair surface side.

FIG. 3 is an enlarged view in which a part of the touch repair surface is vertically cut and cut.

FIG. 4 is a partially enlarged view showing a state in which a pipe is inserted into a cooling hole to form a touch repair surface.

FIG. 5 is an enlarged view showing a state where the touch repair surface fills the entire circular cross section of the cooling hole.

[Explanation of symbols]

 1 Cylinder cover 2 Touch repair surface 3 Cooling hole 4 Touch repair surface Welding hole 5 Pipe

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location F01P 3/14 B F02F 1/24 M 1/36 A

Claims (2)

[Scope of utility model registration request] 1. A touch repair which is formed in an annular shape along the circumference of a touch surface A of a cylinder cover 1 from the touch surface A side to a thickness reaching a semicircular portion of a circular cross section of a cooling hole 3. A cylinder cover formed in the surface welding hole 4 by overlay welding, and forming an anti-corrosion and heat-resistant metal touch repairing surface 2 having a thickness reaching the cooling hole 3 by overlay welding, and re-piercing the cooling hole 3. Touch repair surface. 2. A touch-repair repair surface formed in an annular shape along the circumference of the touch-contact surface A of the cylinder cover 1 in a thickness such that the entire circular cross section of the cooling hole 3 is removed from the touch-contact surface A side. A touch of a cylinder cover formed by overlaying a cooling-resistant touch-resistant surface 2 made of corrosion-resistant and heat-resistant metal in the welding hole 4 and reaching the cooling hole 3 by overlay welding. Fire restoration surface.