Quenching coil capable of preventing inclined oil hole of bent lever of crankshaft from being damaged

Abstract

In order to solve the problems that in the prior art, according to an engine crankshaft bent lever quenching method, burnout or cracking is prone to occurring, mechanical performance cannot meet requirements due to insufficient quenching and the like, the utility model provides a quenching coil for preventing an inclined oil hole of a crankshaft bent lever from being damaged, and the quenching coil comprises a base, a quenching coil body and a water spraying pipe, a coil through hole for mounting a quenching coil is formed in the middle of the base, and water spraying through holes for mounting water spraying pipes are formed in the two sides of the coil through hole; a copper pipe with a rectangular or special-shaped cross section is adopted to wind the quenching coil, and when the copper pipe with the rectangular cross section is adopted to wind the quenching coil, the side, facing the inclined oil hole, of the quenching coil is covered with a magnetic conductive ring; the size and the shape of the magnetic conductive ring are matched with those of the quenching coil, and the magnetic conductive ring clings to the surface of the quenching coil. The utility model has the beneficial technical effects that the magnetic field of the quenching coil facing one side of the inclined oil hole is shielded or weakened, the situation that the thin wall of the inclined oil hole is burnt or cracked is avoided, and the quenching quality is ensured.

Description

Technical Field

[0001] The utility model relates to a quenching technology for an engine crankshaft and crankshaft, in particular to a quenching coil for preventing an inclined oil hole of the crankshaft and crankshaft from being damaged. Background Art

[0002] The engine crankshaft is usually composed of a left and right crankshaft and a crank throw. It is usually formed by die forging and then machined to form the final parts. To ensure good lubrication of the crankshaft during operation, an oil hole is usually set in the center of the crankshaft, and an oil hole (usually called an inclined oil hole) is machined on the surface of the crankshaft to connect with the central oil hole to ensure the circulation of lubricating oil and ensure the lubrication effect (see attached Figure 1 (In the figure, a is the crankshaft, b is the crank throw, and c is the inclined oil hole). After the engine crankshaft is machined, it needs to be quenched to ensure sufficient hardness and strength. High-frequency or medium-frequency quenching is typically used. This involves using a round copper tube to form a circular coil. A high-frequency or medium-frequency current is applied to the coil, and the crankshaft is inserted along the center of the coil. The magnetic field heats the rod surface. Simultaneously, water spray pipes adjacent to the coil spray water onto the rod surface to cool it, completing the quenching process. Obviously, the speed and length of the rod's insertion into the coil must be controlled. The insertion speed directly affects the quenching depth, while the length affects the quenching range. To improve the mechanical properties of the crankshaft, it is desirable to quench the entire rod. However, the inclined oil hole in the crankshaft creates a thin wall structure outside the hole. When exposed to the magnetic field, this thin wall experiences localized high temperatures, causing burns or cracking. To prevent this from happening, quenching is stopped when the inclined oil hole is still a long distance away from the coil plane. Although this method avoids burning or cracking, it also brings problems such as insufficient quenching resulting in mechanical properties not meeting the requirements.

[0003] Obviously, the prior art engine crankshaft crankshaft quenching method has problems such as the inclined oil hole is prone to burning or cracking, or insufficient quenching resulting in mechanical properties failing to meet requirements. Summary of the Invention

[0004] In order to solve the problems existing in the prior art engine crankshaft crankshaft quenching method, such as the inclined oil holes are prone to burning or cracking, or insufficient quenching resulting in mechanical properties not meeting the requirements, the utility model proposes a quenching coil that prevents damage to the inclined oil holes of the crankshaft crankshaft.

[0005] The utility model discloses a quenching coil for preventing the oblique oil hole of the crankshaft and crankshaft from being damaged, comprising a base, a quenching coil and a water spray pipe; the base is a rectangular parallelepiped structure, a coil through hole for installing the quenching coil is provided in the middle, and water spray through holes for installing the water spray pipe are provided on both sides of the coil through hole; the quenching coil is wound with a copper tube with a rectangular or special-shaped cross section, and is installed in the middle of the base through the coil through hole; and when the quenching coil is wound with a copper tube with a rectangular cross section, a magnetic ring is covered on the side of the quenching coil facing the oblique oil hole; the size and shape of the magnetic ring match the quenching coil and are in close contact with the surface of the quenching coil; when the copper tube with a rectangular cross section is used, the magnetic ring is in close contact with the surface of the quenching coil. When a quenching coil is wound around a copper tube with an irregular shape, the irregular shape of the copper tube is located on the inner side of the quenching coil, and the irregular shape of the quenching coil faces the oblique oil hole; there are two water spray pipes, which are installed on both sides of the quenching coil through the water spray holes respectively; wherein, the copper tube with an irregular cross-section refers to a copper tube with a rectangular cross-section with one corner set as a rounded corner, and the radius of the rounded corner is 1 / 4 to 1 / 2 of the horizontal side length of the rectangular copper tube; the cross-sectional size of the copper tube is 6 to 10 mm × 6 to 10 mm; the tube wall thickness is 1.0 mm to 2.0 mm; the magnetic ring is a laminated structure of silicon steel sheets, and the thickness of the magnetic ring is 1.0 mm to 2.0 mm.

[0006] Furthermore, an axial flange is provided on the inner side of the magnetic conductive ring, and the length of the axial flange is 1.0 mm to 4.0 mm.

[0007] Furthermore, the copper tube with an irregular cross-section refers to a copper tube with a rectangular cross-section with one corner chamfered, and the length of the chamfered side is 1 / 4 to 1 / 2 of the horizontal length of the rectangular copper tube.

[0008] The beneficial technical effect of the quenching coil of the utility model for preventing damage to the inclined oil hole of the crankshaft crankshaft is that it shields or weakens the magnetic field on the side of the quenching coil facing the inclined oil hole, avoiding the burning or cracking of the thin wall of the inclined oil hole, and at the same time, ensuring the quenching quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attachment Figure 1 It is a three-dimensional schematic diagram of the engine crankshaft;

[0010] Attachment Figure 2 It is a three-dimensional schematic diagram of a quenching coil of the utility model having a rectangular cross section;

[0011] Attachment Figure 3 It is a three-dimensional schematic diagram of a quenching coil of the present invention, the cross section of which is a rectangle with rounded corners;

[0012] Attachment Figure 4 It is a three-dimensional schematic diagram of another embodiment of the quenching coil of the utility model having a rectangular cross section;

[0013] Attachment Figure 5It is a three-dimensional schematic diagram of a quenching coil of the utility model, the cross section of which is a rectangle with chamfered corners.

[0014] In the figure, 1 is a base, 2 is a quenching coil with a rectangular cross section, 3 is a water spray pipe, 4 is a magnetic ring, 5 is a quenching coil with a cross section in the shape of a rectangle with one corner set to a rounded corner, 6 is a quenching coil with a cross section in the shape of a rectangle with one corner set to a chamfered corner, a is a curved rod, b is a curved bend, and c is an inclined oil hole.

[0015] The following is a further description of the quenching coil for preventing damage to the inclined oil hole of the crankshaft crankshaft of the present invention in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0016] See attached Figure 2 、 3The utility model provides a quenching coil for preventing the oblique oil hole of the crankshaft from being damaged, comprising a base 1, a quenching coil 2 and a water spray pipe 3; the base is a rectangular parallelepiped structure, with a coil through hole for installing the quenching coil in the middle, and water spray holes for installing the water spray pipe are provided on both sides of the coil through hole; the quenching coil is wound with a copper tube with a rectangular or special cross section, and is installed in the middle of the base through the coil through hole; and when the quenching coil is wound with a copper tube with a rectangular cross section, a magnetic ring 4 is covered on the side of the quenching coil facing the oblique oil hole; the size and shape of the magnetic ring match the quenching coil and are in close contact with the surface of the quenching coil; when the copper tube with a rectangular cross section is used to wind the quenching coil, a magnetic ring 4 is provided ... size and shape of the quenching coil and are in close contact with the surface of the quenching coil When a copper tube with an irregular surface shape is used to wind a quenching coil, the irregular shape of the copper tube is on the inner side of the quenching coil, and the irregular surface of the quenching coil faces the oblique oil hole; there are two water spray pipes, which are installed on both sides of the quenching coil through the water spray holes respectively; wherein, the copper tube with an irregular cross-sectional shape refers to a copper tube 5 with a rectangular cross-sectional shape with one corner set as a rounded corner, and the radius of the rounded corner is 1 / 4 to 1 / 2 of the horizontal side length of the rectangular copper tube; the cross-sectional size of the copper tube is 6 to 10 mm × 6 to 10 mm; the tube wall thickness is 1.0 mm to 2.0 mm; the magnetic ring is a laminated structure of silicon steel sheets, and the thickness of the magnetic ring is 1.0 mm to 2.0 mm. The present invention prevents damage to the crankshaft crankshaft's slanted oil hole by quenching coils. When a magnetic ring is used to cover the side of the quenching coil facing the slanted oil hole, the magnetic field on the side of the quenching coil facing the slanted oil hole is shielded by the magnetic ring. This means that the magnetic lines of force of the magnetic field on the side of the quenching coil facing the slanted oil hole primarily form eddy currents within the magnetic ring, without affecting the crankshaft's surface. This holds true even when the quenching coil is very close to the slanted oil hole. This ensures the quality of the crankshaft's quenching while preventing the thin wall of the slanted oil hole from burning or cracking. When a copper tube with a rectangular cross-section and a rounded corner is used to wind the quenching coil, the irregular shape of the copper tube is on the inner side of the quenching coil and faces the inclined oil hole. Since the irregular shape is rounded, the distance from the surface of the bent rod increases from small to large, and the influence of the magnetic field also increases from small to large. In essence, the influence of the magnetic field at the irregular shape of the quenching coil on the surface of the bent rod is weakened, which can also ensure the quality of the bent rod quenching and avoid the burning or cracking of the thin wall of the inclined oil hole.

[0017] See attached Figure 4 As one of the preferred technical solutions, the inner side of the magnetic ring is provided with an axial flange with a length of 1.0mm to 4.0mm. This can better shield the magnetic field of the quenching coil facing the inclined oil hole, while not affecting the effect of the quenching coil magnetic field on other parts of the crankshaft surface.

[0018] See attached Figure 5As one preferred technical solution, the copper tube with a special cross-section is a copper tube 6 having a rectangular cross-section with one chamfered corner, and the chamfered side is 1 / 4 to 1 / 2 the length of the rectangular copper tube's horizontal side. Using chamfers instead of rounded corners can simplify the processing of special-shaped copper tubes and reduce costs while achieving essentially the same technical results.

[0019] Obviously, the beneficial technical effect of the quenching coil of the utility model for preventing damage to the inclined oil hole of the crankshaft crankshaft is to shield or weaken the magnetic field on the side of the quenching coil facing the inclined oil hole, thereby avoiding burning or cracking, and at the same time, ensuring the quenching quality.

Claims

1. A quenching coil for preventing damage to the inclined oil hole of a crankshaft crankshaft, characterized in that: The quenching coil comprises a base, a quenching coil and a water spray pipe; the base is a rectangular parallelepiped structure, with a coil through hole for installing the quenching coil in the middle, and water spray holes for installing the water spray pipe on both sides of the coil through hole; the quenching coil is wound with a copper tube with a rectangular or irregular cross section, and is installed in the middle of the base through the coil through hole; and when the quenching coil is wound with a copper tube with a rectangular cross section, a magnetic ring is covered on the side of the quenching coil facing the oblique oil hole; the size and shape of the magnetic ring match the quenching coil and are tightly attached to the surface of the quenching coil; when the copper tube with an irregular cross section is wound with a copper tube with a rectangular cross section, the magnetic ring is tightly attached to the surface of the quenching coil. When quenching the coil, the irregular shape of the copper tube is located on the inner side of the quenching coil, and the irregular shape of the quenching coil faces the oblique oil hole; there are two water spray pipes, which are installed on both sides of the quenching coil through the water spray holes respectively; wherein, the copper tube with an irregular cross-section refers to a copper tube with a rectangular cross-section with one corner set as a rounded corner, and the radius of the rounded corner is 1 / 4 to 1 / 2 of the horizontal side length of the rectangular copper tube; the cross-sectional size of the copper tube is 6 to 10 mm × 6 to 10 mm; the tube wall thickness is 1.0 mm to 2.0 mm; the magnetic ring is a laminated structure of silicon steel sheets, and the thickness of the magnetic ring is 1.0 mm to 2.0 mm.

2. The quenching coil for preventing damage to the crankshaft crankshaft oil hole according to claim 1, characterized in that: An axial flange is provided on the inner side of the magnetic conductive ring, and the length of the axial flange is 1.0 mm to 4.0 mm.

3. The quenching coil for preventing damage to the crankshaft crankshaft oil hole according to claim 1, characterized in that: The copper tube with an irregular cross-section refers to a copper tube with a rectangular cross-section with one corner chamfered, and the length of the chamfered side is 1 / 4 to 1 / 2 of the horizontal side length of the rectangular copper tube.

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