Thin-wall gear turning clamp

Abstract

The utility model provides a thin-wall gear turning clamp, which belongs to the technical field of gear machining and comprises a mandrel, a pressure pad and a nut. The mandrel comprises a clamping section used for being clamped by the clamping jaw, a positioning section used for penetrating through an inner hole of the thin-wall gear and a connecting section used for being connected with the pressing pad and the nut. The diameter of the pressure pad is matched with the inner diameter of the thin-wall gear positioning hole, and the pressure pad sleeves the connecting section of the mandrel; the nut is connected to the connecting section of the mandrel in a threaded mode, the pressing pad is pressed in the thin-wall gear positioning hole, and the thin-wall gear is clamped through the pressing pad and the positioning section of the mandrel. According to the thin-wall gear turning clamp, the problem of poor parallelism of the end face is solved, meanwhile, vibration marks on the end face are effectively avoided, the thin-wall gear turning clamp is compact in structure, good in machining manufacturability, stable in reliability and convenient to operate, the quality is guaranteed, meanwhile, the machining cost of a workpiece can be reduced, and good economic benefits are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear processing and specifically discloses a thin-wall gear turning fixture. Background Art

[0002] Traditional turning of thin-walled gears (such as Figure 1 ) is used, and the CNC lathe uses a hydraulic power chuck. When clamping, the operator must manually level the thin-walled gear to ensure the parallelism of the thin-walled gear after installation. However, since the thin-walled gear is a large-diameter, thin-walled part, after the three-claw clamps the outer circle of the thin-walled gear during processing (such as Figure 2 ), the clamping force of the jaws causes a slight deformation of the end face of the thin-walled gear, resulting in a larger parallelism of the thin-walled gear after turning. After reducing the pressure of the hydraulic power chuck, the parallelism is improved, but the thin-walled gear is easy to fall off during the processing.

[0003] After follow-up investigation, it was found that the maximum parallelism CPK value of thin-walled gears after turning was 0.97, which was lower than the target value of 1.67. After analyzing the human, machine, material and method links, it was found that the positioning surface and clamping force of the machine tool in contact with the thin-walled gear were the key factors for the parallelism of the end face. Therefore, it is urgent to improve the existing processing method and design a set of thin-walled gear turning fixtures that can not only ensure the parallelism of the thin-walled gear end face, but also facilitate the use of operators. Utility Model Content

[0004] The utility model provides a thin-wall gear turning fixture to improve the parallelism of the thin-wall gear after turning.

[0005] The above-mentioned thin-walled gear turning fixture includes a spindle, a pressure pad and a nut; the spindle includes a clamping section for being clamped by a clamping claw, a positioning section for passing through the inner hole of the thin-walled gear and a connecting section for connecting with the pressure pad and the nut; the diameter of the pressure pad matches the inner diameter of the positioning hole of the thin-walled gear and is sleeved on the connecting section of the spindle; the nut is threadedly connected to the connecting section of the spindle to press the pressure pad into the positioning hole of the thin-walled gear, and the pressure pad and the positioning section of the spindle clamp the thin-walled gear.

[0006] The above-mentioned thin-wall gear turning fixture also includes a gasket located between the pressure pad and the nut.

[0007] The spindle and the inner hole of the thin-walled gear are clearance-matched.

[0008] The mandrel is made of a rigid material.

[0009] The utility model has the following beneficial effects:

[0010] 1. The parallelism is unstable before use, and some exceed the upper limit of 0.04mm. After use, the process is stable and the parallelism is less than or equal to 0.025mm;

[0011] 2. The parallelism CPK is less than 1 before use, and the CPK is above 1.67 after use;

[0012] 3. It not only reduces the monthly waste, but also avoids the three-guarantee claims caused by the parallelism deviation of thin-walled gears, which can save more than 10,000 yuan per month, and ensures the quality and improves the credibility;

[0013] In summary, the above-mentioned thin-walled gear turning fixture can effectively avoid the generation of end face chatter marks while solving the problem of poor end face parallelism. It has a compact structure, good processing technology, stable reliability, and convenient operation. It can reduce the processing cost of the workpiece while ensuring quality, and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the structure of thin-walled gear;

[0016] Figure 2 This is a schematic diagram of using a three-jaw chuck to directly clamp a thin-walled gear;

[0017] Figure 3 It is a schematic diagram of the structure of the thin-walled gear after the first stage of finishing when the thin-walled gear turning fixture is used to process the thin-walled gear;

[0018] Figure 4 Schematic diagram of a thin-walled gear turning fixture clamping a thin-walled gear;

[0019] Figure 5 It is a structural schematic diagram of the thin-walled gear after the second stage of finishing when the thin-walled gear is machined by the thin-walled gear turning fixture;

[0020] Figure 6 The process capability of the parallelism of the end faces of thin-walled gears before using the thin-walled gear turning fixture;

[0021] Figure 7 It is the process capability of the parallelism of the end faces of thin-walled gears after using the thin-walled gear turning fixture.

[0022] In the figure: 1- spindle; 2- pressure pad; 3- nut; 4- gasket; 101- thin-walled gear; 102- three-jaw chuck; 102.1- clamping jaw. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The present embodiment provides a thin-walled gear turning fixture, comprising a spindle 1, a pressure pad 2 and a nut 3; the spindle 1 comprises a clamping section for being clamped by a clamp 102.1, a positioning section for passing through an inner hole of a thin-walled gear and a connecting section for connecting with the pressure pad 2 and the nut 3; the diameter of the pressure pad 2 matches the inner diameter of the positioning hole of the thin-walled gear and is sleeved on the connecting section of the spindle 1; the nut 3 is threadedly connected to the connecting section of the spindle 1, pressing the pressure pad 2 in the positioning hole of the thin-walled gear to achieve positioning, and the pressure pad 2 and the positioning section of the spindle 1 clamp the thin-walled gear 101.

[0025] The above-mentioned thin-walled gear turning fixture further includes a gasket 4 located between the pressure pad 2 and the nut 3 to disperse the pressure of the nut 3 on the pressure pad 2.

[0026] The spindle 1 is clearance-matched with the inner hole of the thin-walled gear.

[0027] The spindle 1 is made of a rigid material.

[0028] The thin-walled gear turning fixture mentioned above can not only ensure the process size requirements, but also is simple to manufacture, low in cost, and suitable for batch processing.

[0029] The process of machining the thin-walled gear 101 using the above-mentioned thin-walled gear turning fixture is as follows:

[0030] In the first process of fine turning, the wide-edge three-jaw is used to clamp the outer circle of the thin-walled gear and turn the inner hole of the thin-walled gear to the drawing requirements, and the reverse turning tool is used to process the left end face to the size required by the drawing, as the positioning hole of the thin-walled gear in the second process of fine turning ( Figure 3 );

[0031] In the second process of finishing, clamp the spindle 1 on the three-jaw chuck 102 for alignment and clamping, then install the thin-walled gear 101 on the spindle 1, install the pressure pad 2, and tighten it with the nut 3 ( Figure 4 ), machining part 2 thin-walled gear 101 both end faces ( Figure 5 ), after each processing, it is only necessary to loosen the nut 3 to clamp the thin-walled gear 101, and the spindle 1 is fixed on the three-jaw chuck 102 and does not move.

[0032] The above-mentioned thin-walled gear turning fixture utilizes the self-centering function of the three-jaw chuck 102 and designs the turning fixture in the manner of inner hole and end face positioning. Since the inner hole, end face and outer circle of the thin-walled gear 101 are clamped and processed at one time during the fine turning process, the coaxiality of the inner and outer circles of the thin-walled gear 101 and the verticality of the end face can be ensured, and it has the following characteristics:

[0033] a. Simple adjustment, easy operation, one-time use and long-term use;

[0034] b. Avoid the radial clamping force of the machine tool and use the end face clamping method;

[0035] c. Reduce processing waste and improve quality;

[0036] d. The design is standardized and can be widely promoted in the industry.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A thin-walled gear turning fixture, characterized in that: Includes spindle, pressure washer and nut; The spindle comprises a clamping section for being clamped by the clamping claws, a positioning section for passing through the inner hole of the thin-walled gear, and a connecting section for connecting with the pressure pad and the nut; The diameter of the pressure pad matches the inner diameter of the positioning hole of the thin-walled gear and is sleeved on the connecting section of the spindle; The nut is threadedly connected to the connecting section of the spindle, pressing the pressure pad tightly into the positioning hole of the thin-walled gear, and the pressure pad and the positioning section of the spindle clamp the thin-walled gear.

2. The thin-walled gear turning fixture according to claim 1, characterized in that: Also included is a spacer located between the pressure washer and the nut.

3. The thin-walled gear turning fixture according to claim 1, characterized in that: The spindle and the inner hole of the thin-walled gear are clearance-matched.

4. The thin-walled gear turning fixture according to claim 3, characterized in that: The mandrel is made of a rigid material.

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