Auxiliary fixture for machining outer circle of shaft bushing of printing machine

Abstract

The utility model relates to an auxiliary fixture for processing the excircle of a shaft bushing of a printing machine, which comprises a fixture main body, the fixture main body is a circular shaft, the tail end of the circular shaft is a shaft head, and the shaft head is clamped and fixed in a chuck of a lathe; a screw rod is arranged at the front end of the circular shaft, the screw rod is coaxial with the circular shaft, a fixing nut is sleeved on the screw rod, a boss is arranged on the periphery of the circular shaft, and the boss is positioned on the tail side of the circular shaft and is opposite to the fixing nut; the circular shaft is sleeved with a lining, the tail end of the lining abuts against the boss, and the fixing nut is screwed down, pressed on the front end face of the lining and used for clamping and fixing the lining together with the boss; the bush is a copper bush. During clamping, an end face clamping and fixing mode is adopted, and the machining area and the machining precision of the outer circle of the lining are not affected.

Description

Technical Field

[0001] The utility model relates to a printing press, in particular to an auxiliary clamp for machining the outer circle of a shaft bushing of a printing press. Background Art

[0002] Among all the parts of printing machines, the outer diameter of copper bushings has a relatively high machining precision. When finishing the outer diameter of copper bushings, the copper bushings are usually clamped directly into the chuck of the lathe, and the inner teeth of the chuck bite on the outer diameter of the copper bushings, which not only limits the machining area, but also often damages the outer diameter of the copper bushings, affecting its precision. Summary of the invention

[0003] In order to solve the above problems, the utility model proposes an auxiliary fixture for machining the outer circle of a printing press shaft bushing. When clamping, an end face clamping and fixing method is adopted, which will not affect the machining area and machining accuracy of the outer circle of the bushing.

[0004] The technical solution of this utility model:

[0005] An auxiliary fixture for machining the outer circle of a printing press shaft bushing, the fixture comprising a fixture body, the fixture body being a round shaft, the end of the round shaft being a shaft head, clamped and fixed in a chuck of a lathe; a screw is arranged at the front end of the round shaft, the screw is coaxial with the round shaft, a fixing nut is sleeved on the screw, a boss is arranged on the outer periphery of the round shaft, the boss is located at the end of the round shaft and opposite to the fixing nut;

[0006] (The inner hole diameter of the bushing is equal to the diameter of the round shaft). When in use, the bushing is sleeved on the round shaft, and its end is against the boss. The fixing nut is tightened, and it is pressed on the front end surface of the bushing and clamps the bushing together with the boss. The bushing is a copper sleeve. In this way, the processing area and processing accuracy of the outer circle of the bushing will not be affected.

[0007] The contact surface between the bushing and the circular shaft is smooth; the bushing smooth surface is set based on process requirements, and the circular shaft smooth surface is for the convenience of loading and unloading the bushing.

[0008] A plurality of positioning grooves are arranged on the end face of the bushing terminal, and a plurality of positioning protrusions are arranged on the boss. When the fixing nut and the boss clamp the bushing together, the positioning protrusions extend into the positioning grooves one by one, which effectively prevents the bushing from deflecting during the turning process of the bushing outer circle, thereby affecting the outer circle machining accuracy.

[0009] The outer periphery of the front end of the circular shaft has an arc chamfer, which facilitates the sleeve to be sleeved on the circular shaft.

[0010] The fixing nut has glue on its surface in contact with the front end surface of the bushing; the formed rubber pad 1) increases the friction resistance between it and the front end surface of the bushing; 2) reduces shock; 3) generates elastic force acting on the fixing nut (similar to a spring washer), which can effectively prevent the fixing bolt from loosening during the turning process of the outer circle of the bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the auxiliary fixture structure for bushing outer circle machining.

[0012] Figure 2 yes Figure 1 Schematic diagram of the cross section along the AA direction.

[0013] In the figure, a round shaft 1, a shaft head 1-1, a boss 1-2, a positioning protrusion 1-3, an arc chamfer 1-4, a screw 2, a fixing nut 3, a bushing 4, and a rubber pad 5 are provided. DETAILED DESCRIPTION

[0014] like Figure 1-2 As shown, an auxiliary fixture for machining the outer circle of a printing press shaft bushing, the fixture comprises a fixture body, the fixture body is a round shaft 1, the end of the round shaft 1 is a shaft head 1-1, which is clamped and fixed in the chuck of a lathe; a screw 2 (integrated with the round shaft 1) is arranged at the front end of the round shaft 1, the screw 2 is coaxial with the round shaft 1, and a fixing nut 3 is sleeved on the screw 2, and a boss 1-2 is arranged on the outer periphery of the round shaft 1, and the boss 1-2 is located at the end of the round shaft 1 and opposite to the fixing nut 3;

[0015] (The inner diameter of the bushing 4 is equal to the diameter of the circular shaft 1), the bushing 4 is sleeved on the circular shaft 1, and its end is against the boss 1-2, and the fixing nut 3 is tightened, which presses on the front end surface of the bushing 4 and clamps and fixes the bushing 4 together with the boss 1-2; the bushing 4 is a copper sleeve;

[0016] The contact surface between the bushing 4 and the circular shaft 1 is a smooth surface;

[0017] The end surface of the bushing 4 is provided with a plurality of positioning grooves, and the boss 1-2 is provided with a plurality of positioning protrusions 1-3. When the fixing nut 3 and the boss 1-2 clamp the bushing 4 together, the positioning protrusions 1-3 extend into the positioning grooves one by one.

[0018] The outer periphery of the front end of the circular shaft 1 has arc chamfers 1-4;

[0019] The fixing nut 3 has a surface contacting with the front end surface of the bushing 4 with glue (forming a rubber pad 5).

[0020] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An auxiliary fixture for machining the outer circle of a printing press shaft bushing, the fixture comprising a fixture body, the fixture body being a round shaft, the end of the round shaft being a shaft head, clamped and fixed in a chuck of a lathe; characterized in that: The front end of the circular shaft is provided with a screw rod, the screw rod is coaxial with the circular shaft, a fixing nut is mounted on the screw rod, and a boss is provided on the outer circumference of the circular shaft, the boss is located at the end of the circular shaft and opposite to the fixing nut; A bushing is sleeved on the round shaft, and its end is against the boss. The fixing nut is tightened, and it is pressed on the front end surface of the bushing and clamps the bushing together with the boss; the bushing is a copper sleeve.

2. The auxiliary fixture for machining the outer circle of a printing press shaft bushing according to claim 1, characterized in that: The contact surface between the bushing and the circular shaft is a smooth surface.

3. The auxiliary fixture for machining the outer circle of a printing press shaft bushing according to claim 1, characterized in that: The end surface of the bushing terminal is provided with a plurality of positioning grooves, and the boss is provided with a plurality of positioning protrusions. When the fixing nut and the boss clamp and fix the bushing together, the positioning protrusions extend into the positioning grooves one by one.

4. The auxiliary fixture for machining the outer circle of a printing press shaft bushing according to claim 1, characterized in that: The outer periphery of the front end of the circular shaft has an arc chamfer.

5. The auxiliary fixture for machining the outer circle of a printing press shaft bushing according to claim 1, characterized in that: The fixing nut has glue attached to the surface that contacts the front end surface of the bushing.

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