CN201511254U - A special fixture for turning eccentric shaft parts - Google Patents

Abstract

The utility model discloses a special fixture for turning eccentric shaft parts, which comprises an eccentric sleeve and an elastic movable top. The end of the processed eccentric shaft part is supported by an elastic live center. The utility model adopts the eccentric sleeve and the top to form a special fixture structure for eccentric shaft processing, which can save the theoretical calculation of the operator on the traditional gasket, and at the same time greatly reduce the skill requirements of the operator, ensuring the turning of the eccentric shaft parts. The operation during processing is simple, the precision is high, and mass production can also be realized. The top of the clamping part adopts an elastic living center to prevent the movement of the part and ensure the processing accuracy.

Description

A special fixture for turning eccentric shaft parts

technical field

The utility model belongs to the technical field of turning machine tools and relates to a special fixture, in particular to a fixture for turning eccentric shaft parts.

Background technique

At present, the main methods of turning eccentric shaft parts are: three-jaw turning method, four-jaw turning method, faceplate turning method and three-jaw fine-tuning turning method. Although these methods can all achieve the purpose of turning the eccentric shaft, there are still some defects. For example, the three-jaw turning method has relatively high requirements on the operator, requiring the operator to have both mathematical calculation ability and strong operating skills; while the four-jaw turning method and the faceplate turning method have either low precision or poor operability, which are all It brings great inconvenience to production, especially mass production. Now, special special fixtures can be used to facilitate operation and ensure accuracy, and mass production can also be realized.

Therefore, providing a turning eccentric shaft fixture that can ensure precision, is easy to operate, can realize mass production, and requires less skill in the operation of the operator has become a technical problem urgently needed to be solved by those skilled in the art.

Contents of the invention

The technical problem to be solved by the utility model is to provide a three-dimensional imaging anti-counterfeiting packaging product with good anti-counterfeiting effect and positioning function, so as to overcome the above-mentioned defects in the prior art.

The technical scheme that the utility model solves technical problem is as follows:

A special fixture for turning eccentric shaft parts, which is characterized in that it includes an eccentric sleeve and an elastic live center. The end of the eccentric shaft part is supported by an elastic living center.

The working principle of the utility model: when turning, the eccentric sleeve and the eccentric shaft parts are installed on the three-jaw chuck of the lathe headstock as shown in Figure 1, and the clamping is appropriate; The top properly tightens the processed parts to prevent the parts from moving and affecting its processing accuracy. After the part has been turned, it is only necessary to remove the elastic live center, remove the finished part, and install the unmachined part. High-precision eccentric shaft parts can be processed by repeating the simple turning process.

It can be seen from the above disclosed technical solutions that the utility model adopts the eccentric sleeve and the top to form a special fixture structure for eccentric shaft processing, which can save the theoretical calculation of the operator on the traditional gasket, and at the same time greatly reduce the skill requirements of the operator. , which ensures simple operation and high precision when turning eccentric shaft parts, and can also realize mass production. The top of the clamping part adopts an elastic living center to prevent the movement of the part and ensure the processing accuracy.

The beneficial effects of the utility model are as follows:

(1) Strong operability: the dependence on the operator's operation skills is very low, and the machining accuracy of parts is not affected by human factors.

(2) It can be processed after being installed as required, without alignment and eccentricity, and the axes of the parts are parallel, which greatly reduces the labor intensity of workers and greatly improves production efficiency.

(3) The machining accuracy of parts is good in interchangeability.

(4) The cost of the special fixture is not high, and the economy is good.

Description of drawings

Fig. 1 is a structural schematic diagram of a specific embodiment of the special fixture of the utility model.

Figure 2 is a schematic diagram of the structure of the elastic live tip.

The reference signs are as follows:

1. Jaw 2. Eccentric sleeve

3. Eccentric shaft parts 4. Elastic live center

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, the special fixture for turning eccentric shaft parts of the utility model includes an eccentric sleeve 2 and an elastic live center 4. The front end of the eccentric shaft part 3 to be processed is arranged in the eccentric sleeve 2, and the The three-jaw chuck 1 is fixedly connected, and the end of the eccentric shaft part 3 to be processed is supported by the elastic live center 4 .

Furthermore, the basic value of the eccentricity of the eccentric sleeve 2 is the same as that of the eccentric shaft part 3 to be processed.

The eccentricity tolerance value of the eccentric sleeve 2 is one fourth to one third of the eccentricity tolerance value of the eccentric shaft part 3 to be processed.

The installation fit between the eccentric sleeve 2 and the eccentric shaft parts 3 to be processed is H6/h6.

The surface roughness of the contact surface between the eccentric sleeve 2 and the eccentric shaft part 3 to be processed is greater than Ra0.8.

The utility model has strong operability and very low dependence on the operator's operation skills; the machining precision of the parts is good in interchangeability; and the cost of the special fixture is not high. It is an ideal method to adopt the utility model for the turning processing of eccentric shaft parts with relatively high processing accuracy requirements or relatively large batches.

Claims (5)

1. A special fixture for turning eccentric shaft parts, characterized in that it includes an eccentric sleeve (2) and an elastic live center (4), and the front end of the eccentric shaft part (3) to be processed is arranged on the eccentric sleeve (2) Inside, the eccentric sleeve (2) is fixedly connected with the three-jaw chuck (1), and the end of the eccentric shaft part (3) to be processed is supported by the elastic live center (4). 2. The special fixture for turning eccentric shaft parts according to claim 1, characterized in that the basic value of the eccentricity of the eccentric sleeve (2) is the same as that of the eccentric shaft parts (3) to be processed. 3. The special fixture for turning eccentric shaft parts according to claim 1, characterized in that the eccentricity tolerance value of the eccentric sleeve (2) is the eccentricity tolerance value of the eccentric shaft part (3) to be processed one-fourth to one-third of that. 4. The special fixture for turning eccentric shaft parts according to claim 1, characterized in that the installation fit between the eccentric sleeve (2) and the eccentric shaft parts (3) to be processed is H6/h6. 5. The special fixture for turning eccentric shaft parts according to claim 1, characterized in that the surface roughness of the contact surface between the eccentric sleeve (2) and the eccentric shaft parts (3) to be processed is greater than Ra0.8 .

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