Ultrathin-wall steel jacket turning tool

Abstract

The ultrathin-wall steel jacket turning tool is an expansion mandrel with a center hole, the outside of the mandrel expansion sleeve is matched with the inner diameter of the ultrathin-wall steel jacket, the inner surface of the mandrel expansion sleeve is a conical surface and is provided with a mandrel expansion core, the mandrel expansion core is provided with a screw extending outwards at the end, with the small outer diameter, of the conical surface, the screw is provided with an expansion nut, and the inner end of the expansion nut abuts against the end of the mandrel expansion sleeve; therefore, the problems of weak machining rigidity and unstable clamping precision of the thin steel sleeve are solved; the wall thickness of the ultra-thin wall steel sleeve can be machined to be 0.05 mm-0. 1 mm, and the machining size precision can reach 0.01 mm.

Description

Technical field:

[0001] The invention relates to a machining tool for an ultra-thin-wall steel sleeve, which is suitable for an annular steel sleeve made of alloy steel and has a diameter between 20 and 100 mm and a wall thickness between 0.05 mm and 0.1 mm. Background technology:

[0002] Positioning holes such as bearing holes and pin holes often wear out after long-term use. The diameter of the hole becomes larger, resulting in a larger assembly gap, a decrease in positioning accuracy, or the shaft inside vibrates violently during operation, causing noise and abnormal sounds. Some holes are hard or the workpiece is large, and the location is not convenient for repair by additive welding or electroplating, or after repair welding, it is impossible to perform tight machining to restore its position accuracy. The installation of thin-walled bushings provides a feasible repair method for such worn holes. Ultra-thin-wall steel sleeves made of high-quality alloy steel with matching inner and outer diameters can easily correct the worn holes to the required size. It is convenient, efficient, and low-cost. It will not further damage the tissues and components around the worn holes. It is convenient and practical.

[0003] Ultra-thin-wall steel sleeves are so thin that they are as soft as aluminum foil. They do not have the rigidity to maintain their stable shape. Whether it is cutting or measuring with a ruler, the sleeve will be deformed and lose accuracy. Therefore, the wall thickness that can be processed by steel sleeves is generally greater than 0.3mm. If you want to process the wall thickness to less than 0.1mm, conventional processing methods cannot achieve it. Summary of the invention:

[0004] The invention relates to a tool for turning an ultra-thin-wall steel sleeve.

[0005] The technical solution of the present invention is:

[0006] The tooling for turning the ultra-thin-wall steel sleeve of the present invention is an expansion mandrel installed in the inner hole of the ultra-thin-wall steel sleeve; the expansion mandrel has a mandrel expansion sleeve, the outer surface of the mandrel expansion sleeve is a cylindrical surface that matches the inner diameter of the ultra-thin-wall steel sleeve, the inner surface of the mandrel expansion sleeve is a conical surface, the inner surface of the mandrel expansion sleeve is equipped with a mandrel expansion core, the outer surface of the mandrel expansion core is a conical surface that matches the inner surface of the mandrel expansion sleeve, the mandrel expansion core is provided with an outwardly extending screw at the end with a small outer diameter of the conical surface, the screw is provided with a tightening nut, and the inner end of the tightening nut is pressed against the end of the mandrel expansion sleeve.

[0007] The tooling for turning the ultra-thin-wall steel sleeve of the present invention has a top hole on the outer end surface of the screw. The diameter of the mandrel expansion sleeve is between 20 and 100 mm, and the tolerance is between -0.05 and -0.1. The length of the mandrel expansion sleeve is 5 mm greater than the length of the ultra-thin-wall steel sleeve.

[0008] This ultra-thin-wall steel sleeve turning process method and tooling solves the problems of clamping deformation and cutting resistance deformation of thin-wall steel sleeves:

[0009] 1. Solve the problem of clamping deformation by making a blank with an extended chuck.

[0010] When preparing the blank, the blanking length is the finished length of the ultra-thin-wall steel sleeve + 40mm, leaving about 40mm of the clamping handle. During the processing, one end of the ultra-thin-wall steel sleeve is always connected to the clamping handle, and the clamping handle is rigidly connected to the machine tool headstock chuck to ensure the clamping rigidity and stability of the sleeve. After the outer end face and inner and outer circles of the ultra-thin steel sleeve are processed, it will be cut off from the clamping handle.

[0011] 2. Use a mandrel to support the inner hole of the ultra-thin-wall steel sleeve to solve the problem of deformation during processing of the ultra-thin-wall steel sleeve.

[0012] For the blank with the clamping head, one end face and the inner hole are first processed into a finished product, and the mandrel is inserted into the inner hole. In order to make the mandrel and the inner hole of the steel sleeve fit closely, an expansion mandrel is used, and the top of the machine tool tailstock is used to accurately position it in the vertex hole of the mandrel. After the expansion mandrel is installed in the inner hole of the steel sleeve, the ultra-thin-walled steel sleeve becomes a rigid entity, and when the outer circle is processed again, it will not collapse and the tool will not be able to be processed. In addition, after the expansion mandrel is installed, one end of the steel sleeve is firmly connected to the machine tool chuck through an integrated chuck, and the other end is connected and positioned with the machine tool tailstock through the top hole of the mandrel. The processing stability and positioning accuracy are doubled, so that the processing size accuracy of the ultra-thin-walled steel sleeve can be within 0.01mm. Description of the drawings:

[0013] Figure 1 Schematic diagram of blank clamping in ultra-thin-wall steel sleeve turning tooling.

[0014] In the figure: 1. Lathe jaws 2. Steel sleeve blank.

[0015] Figure 2 Schematic diagram of the main section view and right side view of the expansion mandrel assembly of the ultra-thin wall steel sleeve turning tooling.

[0016] In the figure: 3, mandrel expansion sleeve 4, mandrel expansion core 5, expansion nut.

[0017] Figure 3 Schematic diagram of the expansion mandrel of the ultra-thin-wall steel sleeve turning tooling being installed into the inner hole of the steel sleeve.

[0018] In the figure: 1. Lathe jaws 2. Steel sleeve blank. 3. Mandrel expansion sleeve 4. Mandrel expansion core 5. Expansion nut. 6. Lathe tailstock center. Specific implementation method:

[0019] The implementation of the present invention is further described below in conjunction with the accompanying drawings:

[0020] a. Lathe clamping: Insert the clamping handle of the blank (2) into the chuck about 40mm, and firmly clamp the lathe jaws (1) to ensure that the clamping is secure. (See Figure 1 )

[0021] b. Turn the outer end face of the steel sleeve blank (2) flat and turn the outer circle to a round shape. The cutting parameters are rotation speed Vc = 80-120 m / min, back cutting depth ap = 0.5 mm, and feed rate F = 0.2 mm / r.

[0022] c. Pre-drill the inner hole on the end face of the steel sleeve blank (2), and turn the inner hole of the steel sleeve into a finished product. The turning depth is 5mm greater than the length of the steel sleeve finished product. The cutting parameters are: linear speed Vc = 120-140m / min, back cutting depth ap < 0.2mm, feed rate F = 0.1mm / r. (See Figure 1 )

[0023] d. A tooling for turning an ultra-thin-wall steel sleeve installed in the inner hole of the steel sleeve is an expansion mandrel installed in the inner hole of the ultra-thin-wall steel sleeve; the expansion mandrel has a mandrel expansion sleeve, the outer surface of the mandrel expansion sleeve is a cylindrical surface that matches the inner diameter of the ultra-thin-wall steel sleeve, the inner surface of the mandrel expansion sleeve is a conical surface, the inner surface of the mandrel expansion sleeve is equipped with a mandrel expansion core, the outer surface of the mandrel expansion core is a conical surface that matches the inner surface of the mandrel expansion sleeve, the mandrel expansion core has an outwardly extending screw at the end with a smaller outer diameter of the conical surface, the screw is equipped with a tightening nut, and the inner end of the tightening nut is pressed against the end of the mandrel expansion sleeve. A top hole is opened on the outer end surface of the screw. The diameter of the mandrel expansion sleeve is between 20 and 100 mm, and the tolerance is between -0.05 and -0.1. The length of the mandrel expansion sleeve is 5 mm larger than the length of the ultra-thin-wall steel sleeve. An expansion mandrel (3) is formed.

[0024] Place the end face of the mandrel expansion sleeve (3) close to the inner end face of the steel sleeve hole after deepening it by 5mm, tighten the expansion nut, flatten the outer end face of the mandrel expansion core after tightening, and drill an A4 top hole on the end face of the screw extending out of the mandrel expansion core.

[0025] (See Figure 3 )

[0026] e. Tighten the top of the tailstock of the machine tool on the top hole of the mandrel, semi-finish turning and finishing the outer circle of the steel sleeve. The cutting parameters are: linear speed Vc = 120 ~ 140m / min, back cutting depth ap < 0.2mm, feed rate F = 0.1mm / r. (See Figure 3 )

[0027] f. Use a cutting tool to cut the thin-walled steel sleeve from the clamping head. The cutting parameters are: rotation speed S = 10r / min, back cutting depth ap < 1mm, feed rate F = 0.02mm / r.

Claims

1. A tool for turning an ultra-thin-wall steel sleeve, which is an expansion mandrel installed in the inner hole of the ultra-thin-wall steel sleeve; Features: The expansion mandrel has a mandrel expansion sleeve, the outer surface of the mandrel expansion sleeve is a cylindrical surface that matches the inner diameter of the ultra-thin wall steel sleeve, the inner surface of the mandrel expansion sleeve is a conical surface, the inner surface of the mandrel expansion sleeve is equipped with a mandrel expansion core, the outer surface of the mandrel expansion core is a conical surface that matches the inner surface of the mandrel expansion sleeve, the mandrel expansion core is provided with an outwardly extending screw at the end with a small outer diameter of the conical surface, the screw is provided with a tightening nut, and the inner end of the tightening nut is pressed against the end of the mandrel expansion sleeve.

2. The ultra-thin-wall steel sleeve turning tool as claimed in claim 1, characterized in that: The outer end surface of the screw is provided with a top hole.

3. The ultra-thin-wall steel sleeve turning tool as claimed in claim 1 or 2, characterized in that: The diameter of the mandrel expansion sleeve is between 20 and 100 mm, and the tolerance is between -0.05 and -0.

1.

4. The ultra-thin-wall steel sleeve turning tool as claimed in claim 1 or 2, characterized in that: The length of the mandrel expansion sleeve is 5mm longer than that of the ultra-thin wall steel sleeve.

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