A super large center hole crankshaft polishing center

Abstract

The utility model relates to a super-large center hole crankshaft polishing top, which belongs to the field of mechanical processing technology. It at least includes a polishing machine, an ordinary top, a top sleeve and a set screw; the upper part of the top sleeve is truncated cone-shaped as a whole, and the lower part is cylindrical, the bottom of the truncated cone is connected to the top of the cylinder, and the upper and lower parts are a whole; the inside of the cylindrical part of the top sleeve is a hollow cylindrical inner hole, and the inside of the truncated cone part is a hollow truncated cone inner hole; two set screws are provided at the bottom of the cylindrical part of the top sleeve; the ordinary top is installed on the tailstock of the polishing machine; the top sleeve is installed on the outer circle of the front end rod of the ordinary top through the cylindrical part, and is fixed by the set screws; the cylindrical inner hole of the top sleeve matches the outer circle of the front end rod of the ordinary top; the truncated cone inner hole of the top sleeve matches the large taper head of the ordinary top. The utility model has a simple structure and low cost, and the utility model adopts set screw locking in the positioning method, which is safe and fast, and easy to replace and disassemble.

Description

Technical Field

[0001] The utility model relates to a polishing top of a crankshaft with an extra-large center hole, belonging to the technical field of mechanical processing. Background Art

[0002] In the field of mechanical processing, especially in precision machining and assembly processes, centers are often needed to position and support workpieces. Centers are usually used on rotating equipment such as lathes and grinders, and are used in conjunction with the chuck of the machine tool to achieve stable support for long workpieces or workpieces with complex shapes. The design of the center directly affects the accuracy and efficiency of the processing process. The irregular shape of the crankshaft increases the difficulty of support, requiring the center to be able to adapt to the specific shape of the crankshaft center hole and maintain high-precision positioning during the polishing process.

[0003] A crankshaft product currently in production has a center hole diameter of φ106.6. When polishing the journal on a polishing machine, the ordinary center is too small to support such a large center hole, and an ultra-large rotary center is required. However, due to the special size and structure of this ultra-large center, the manufacturing process is complicated, difficult, and expensive. In addition, the existing ultra-large center also has the problem of poor adjustment flexibility during the polishing process. Summary of the invention

[0004] The utility model solves the problems existing in the above-mentioned prior art and provides a super-large center hole crankshaft polishing top. The utility model can be suitable for the super-large center hole crankshaft polishing and the utility model can be flexibly adjusted during the polishing process.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the utility model is a super-large center hole crankshaft polishing top, which at least includes a polishing machine, an ordinary top, a top sleeve and a locking screw; the upper part of the top sleeve is generally truncated cone-shaped, and the lower part is cylindrical, the diameter of the bottom of the truncated cone is the same as the diameter of the cylinder, the diameter of the top of the truncated cone is smaller than the bottom diameter, the bottom of the truncated cone is connected to the top of the cylinder, and the upper and lower parts are a whole; the interior of the cylindrical part of the top sleeve is a hollow cylindrical inner hole, and the interior of the truncated cone part is a hollow truncated cone inner hole; two locking screws are provided at the bottom of the cylindrical part of the top sleeve; the ordinary top is mounted on the tailstock of the polishing machine; the top sleeve is installed on the outer circle of the front end rod of the ordinary top through the cylindrical part, and is fixed by the locking screw; the cylindrical inner hole of the top sleeve matches the outer circle of the front end rod of the ordinary top; the truncated cone inner hole of the top sleeve matches the large taper head of the ordinary top.

[0006] Moreover, the matching standard between the cylindrical inner hole of the top sleeve and the outer circle of the front end rod of the neck tip is H6 / h6.

[0007] Moreover, the concentricity between the truncated cone-shaped inner hole of the top sleeve and the large-tapered head of the ordinary top is controlled within 0.05.

[0008] Moreover, the rotation accuracy of the top sleeve is controlled within 0.1, which will not affect the polishing roughness of the crankshaft.

[0009] Moreover, the top sleeve and the front end rod of the ordinary top are locked by a set screw, ensuring that the ordinary top can drive the top sleeve to rotate together, and at the same time it is convenient to replace the top sleeve when it is worn.

[0010] According to the above technical solution, the utility model provides a super-large center hole crankshaft polishing top through the top sleeve cylindrical inner hole and the top front end rod outer circle matching; the top sleeve truncated cone inner hole and the common top large taper head match, and then the top sleeve is fixedly installed on the top front end rod outer circle by the set screw, forming a top suitable for super-large center hole crankshaft polishing. Compared with the prior art, the utility model has the following advantages:

[0011] (1) The super-large center hole crankshaft polishing center provided by the utility model has a simple structure and low cost.

[0012] (2) The super-large center hole crankshaft polishing center provided by the utility model adopts a set screw locking method in the positioning method, which is safe and fast, and is easy to replace and remove.

[0013] (3) The cylindrical inner hole of the tip sleeve of the super-large center hole crankshaft polishing tip provided by the utility model matches the outer circle of the front end rod of the ordinary tip with the standard of H6 / h6, so that the rotation accuracy of the tip sleeve is controlled within 0.1 and will not affect the polishing roughness of the crankshaft.

[0014] (4) The tip sleeve of the super-large center hole crankshaft polishing tip provided by the utility model can be replaced with different sizes and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Side view of the overall structure of the crankshaft polishing center with extra-large center hole.

[0016] In the figure: 1. Ordinary center; 2. Center sleeve; 3. Set screw; 4. Cylindrical inner hole; 5. Cone-shaped inner hole; 6. Outer circle of the front end of the ordinary center; 7. Ordinary center with large taper head; 8. Crankshaft. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the following embodiments.

[0018] In the technical solution provided by the utility model, a super large center hole crankshaft polishing top, such as Figure 1As shown, it includes an ordinary top 1, a top sleeve 2 and a locking screw 3; the upper part of the top sleeve is generally truncated cone-shaped, and the lower part is cylindrical, the diameter of the bottom of the truncated cone is the same as the diameter of the cylinder, the diameter of the top of the truncated cone is smaller than the bottom diameter, the bottom of the truncated cone is connected to the top of the cylinder, and the upper and lower parts are a whole; the interior of the cylindrical part of the top sleeve 2 is a hollow cylindrical inner hole 4, and the interior of the truncated cone part is a hollow truncated cone-shaped inner hole 5; two locking screws 3 are provided at the bottom of the cylindrical part of the top sleeve 2; the ordinary top 1 is mounted on the tailstock of the polishing machine; the top sleeve 5 is installed on the outer circle 6 of the front end rod of the ordinary top through the cylindrical part, and is fixed by the locking screw 3; the cylindrical inner hole 4 of the top sleeve matches the outer circle 6 of the front end rod of the ordinary top; the truncated cone inner hole 5 of the top sleeve matches the large taper head 7 of the ordinary top.

[0019] Moreover, the matching standard between the cylindrical inner hole 4 of the top sleeve and the outer circle 6 of the front end rod of the neck tip is H6 / h6.

[0020] Moreover, the concentricity between the truncated cone-shaped inner hole 5 of the top sleeve and the large-taper head 7 of the common top is controlled within 0.05.

[0021] Moreover, the rotation accuracy of the top sleeve 2 is controlled within 0.1, which will not affect the polishing roughness of the crankshaft 8.

[0022] Moreover, the top sleeve 2 is locked with the front end rod of the common top by means of the set screw 3, so as to ensure that the common top 1 can drive the top sleeve 2 to rotate together, and at the same time, the top sleeve 2 is convenient to replace when it is worn.

[0023] In this embodiment, the taper of the common top large taper head 7 is 60°. Figure 1 , install the ordinary top 1 on the tailstock of the polishing machine; the top sleeve 2 is installed on the outer circle 6 of the front end rod of the top through the cylindrical part, and fixed by the set screw 3; the matching standard of the cylindrical inner hole 4 of the top sleeve and the outer circle 6 of the front end rod of the top is H6 / h6, and the concentricity of the truncated cone inner hole 5 of the top sleeve and the 60° large taper head at the front end of the ordinary top can be controlled within 0.05, so the rotation accuracy of the top sleeve 2 can be controlled within 0.1. For the top used for polishing, the rotation accuracy of 0.1 has no effect on the polished surface roughness of the crankshaft 8.

Claims

1. A super large center hole crankshaft polishing center, comprising at least a polishing machine, a common center, a center sleeve and a set screw, characterized in that: The upper part of the top sleeve is generally in the shape of a truncated cone, and the lower part is in the shape of a cylinder. The diameter of the bottom of the cone is the same as the diameter of the cylinder, and the diameter of the top of the cone is smaller than the diameter of the bottom. The bottom of the cone is connected to the top of the cylinder, and the upper and lower parts are a whole; the interior of the cylindrical part of the top sleeve is a hollow cylindrical inner hole, and the interior of the truncated cone part is a hollow truncated cone inner hole; two fixing screws are provided at the bottom of the cylindrical part of the top sleeve; the ordinary top is mounted on the tailstock of the polishing machine; the top sleeve is installed on the outer circle of the front end rod of the ordinary top through the cylindrical part, and is fixed by fixing screws; the cylindrical inner hole of the top sleeve matches the outer circle of the front end rod of the ordinary top, and the truncated cone inner hole of the top sleeve matches the large taper head of the ordinary top.

2. The super large center hole crankshaft polishing tip according to claim 1, characterized in that: The cylindrical inner hole of the top sleeve and the outer circle of the front end rod of the neck tip are matched to H6 / h6.

3. The super large center hole crankshaft polishing tip according to claim 1, characterized in that: The concentricity between the truncated cone-shaped inner hole of the top sleeve and the large-tapered head of the ordinary top is controlled within 0.

05.

4. The super large center hole crankshaft polishing tip according to claim 1, characterized in that: The rotation accuracy of the top sleeve is controlled within 0.1 and will not affect the polishing roughness of the crankshaft.

5. The super-large center hole crankshaft polishing tip according to claim 1, characterized in that: The top sleeve and the front end rod of the ordinary top are locked by a set screw, ensuring that the ordinary top can drive the top sleeve to rotate together, and at the same time it is convenient to replace the top sleeve when it is worn.

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