CN201067821Y - Core shaft clamp for machining disc type gear - Google Patents

Abstract

The utility model discloses a disk is dabber anchor clamps for gear machining, it includes rigidity dabber (1), clamping nut (4), needle roller holder (5), pressure spring (6), circular cone kingpin (7). A conical roller pin (7) is arranged between the rigid mandrel (1) and the workpiece (2), the matching surfaces of the rigid mandrel (1) and the conical roller pin (7) are in taper contact, the taper directions are opposite, the taper of the conical roller pin (7) is 1/2 of the taper of the rigid mandrel (1), the conical roller pin (7) is arranged in a groove of a roller pin retainer (5), the roller pin retainer (5) is sleeved on the rigid mandrel (1), the outer end surface of the roller pin retainer is attached to a clamping nut (4), and the clamping nut (4) is connected with the rigid mandrel (1); the compression spring (6) is sleeved on the rigid mandrel (1), and two ends of the compression spring are respectively supported on the inner end surface of the needle roller retainer (5) and the step of the rigid mandrel (1). The utility model overcomes the anchor clamps adaptability that prior art exists is very poor, hardly guarantee product quality's not enough when the fluctuation of gear hole size is great, has reduced manufacturing cost.

Description

Mandrel Fixtures for Disc Gear Machining

Technical field:

The utility model relates to a mandrel clamp for processing disc gears.

Background technique:

Gears are an important basic part of mechanical transmission. In terms of shape, it can generally be divided into two major categories: shaft gears and disc gears. In order to meet the precision requirements of gears, various gear processing methods such as hobbing, shaving or grinding are generally used in production. As far as disc gears are concerned, no matter which gear processing method is used, a process mandrel fixture is required.

At present, the mandrel fixture commonly used in production, as shown in Figure 1, is composed of three parts such as a rigid mandrel (1), a flat washer (3), and a clamping nut (4); when clamping, the workpiece (2 ) takes the outer circle of the rigid mandrel (1) as the positioning reference, and clamps the workpiece by tightening the clamping nut (4). When not pinching the workpiece. Its advantages are: the fixture structure is simple, the number of parts is small, and the manufacturing cost is low; its disadvantages are: the size adaptability of the fixture is very poor, it requires high precision and good consistency of the inner hole size of the processed gear; the inner hole size The processing of batches of parts with large fluctuations cannot guarantee product quality; for gears with different inner hole sizes, different mandrel fixtures need to be made; even if the precision of the inner hole size of the processed gear is high, the consistency is also very good The precision requirements of the gear itself are very high, such as gears of grade 4 and grade 5. Using such a mandrel fixture cannot guarantee that the processed products are qualified. The reason is very simple, because the workpiece (2) is clamped with a rigid core. The outer circle of the shaft (1) is used as a positioning reference, and there is always a gap in the fit between them, and this fit gap will directly affect the machining accuracy of the gear, especially the impact on the runout of the ring gear is particularly significant.

Utility model content:

The technical problem to be solved by the utility model is: to provide a mandrel clamp for disc gear processing to overcome the poor size adaptability of the existing clamp in the prior art, and it is difficult to guarantee the product when the size of the inner hole of the gear fluctuates greatly. The lack of quality.

The utility model is constituted like this: it comprises rigid mandrel (1), clamping nut (4), needle cage (5), stage clip (6), tapered needle (7). There is a tapered needle roller (7) between the rigid mandrel (1) and the workpiece (2). The cooperation between the rigid mandrel (1) and the tapered needle roller (7) adopts taper, and the directions of the two tapers are opposite. The tapered needle roller ( 7) The taper is 1/2 of the taper of the rigid mandrel (1), the tapered needle roller (7) is in the groove of the needle cage (5), and the needle cage (5) is set on the rigid mandrel (1) , its outer end surface fits with the clamping nut (4), and the clamping nut (4) is connected with the rigid mandrel (1).

The compression spring (6) is sleeved on the rigid mandrel (1), and its two ends are respectively supported on the inner end surface of the needle roller cage (5) and on the steps of the rigid mandrel (1).

Since the mating surface of the rigid mandrel (1) and the tapered needle roller (7) adopts taper contact, the direction of the taper is opposite, and the taper of the tapered needle roller is equal to 1/2 of the taper of the rigid mandrel, so the generatrix of the tapered needle roller and the The centerlines of the rigid mandrel bodies are parallel. The size of the taper is determined according to the fluctuation of the inner hole size of the processed gear or the difference in the inner hole size of different gears.

The tapered needle roller (7) consists of three or more tapered needle rollers with identical shapes and sizes. The number of tapered needle rollers is determined by the size of the inner hole of the processed gear part. Generally speaking, the larger the inner hole of the processed gear part, the more the number of tapered needle rollers, so as to increase the mandrel fixture and the inner hole of the processed gear. The contact area between holes is used to improve the contact strength.

The tapered needle roller (7) is set on the rigid mandrel (1) through the needle roller cage (5). There are straight grooves with the same number as the tapered needle roller on the circumference of the needle roller cage. The tapered needle roller ( 7) The axial direction in the groove and the straight groove adopt a small clearance. When clamping the workpiece, loosen the clamping nut (4) first, put the workpiece (2) on the gear to be processed, and then push the needle roller cage (5) to move to the right by tightening the clamping nut (4), and at the same time the needle roller The cage (5) pushes the tapered needle roller (7) to move to the right, and the tapered needle roller (7) stretches and expands radially due to the increase in taper diameter of the tapered needle roller (7) and the rigid mandrel (1). Tighten the inner hole of the gear. When loosening, unscrew the clamping nut (4), push the needle roller cage (5) to move to the left under the action of the compression spring (6), and at the same time, the needle roller cage (5) drives the tapered needle roller (7) to Move to the left and loosen, the gear workpiece (2) to be machined can be taken off.

It can be seen from the above that what the utility model utilizes are three or more tapered needle rollers (7) with the same shape and size. 1) When the axis of the conical surface moves while producing radial expansion to clamp the workpiece, it is different from the clamping method generally used in production, which uses the outer circle of the rigid mandrel as the positioning reference and only relies on tightening the clamping nut. Essentially different.

Compared with the prior art, the utility model has the following advantages:

First: There is no clearance between the mandrel and the inner hole of the processed gear, thus eliminating the machining error caused by the clearance;

Second: Reduce the precision requirements for the inner hole size of the processed gear, and ensure the quality of the product when processing batches of parts with large inner hole size fluctuations;

Third: When the diameters of the inner holes of the gears to be processed are not much different, generally within 2mm, they can be used to process different types of gears, thereby realizing the versatility of the mandrel fixture within a certain range of gear inner holes and reducing the production cost.

Description of drawings:

Fig. 1 is a schematic diagram of the structure of the mandrel fixture commonly used in production at present;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is a schematic structural view of the needle cage (5) of the present utility model;

Fig. 4 is a sectional view of the groove of the needle cage (5) in Fig. 3 .

Detailed ways:

Embodiments of the utility model: the utility model is mainly composed of rigid mandrel 1, tapered needle roller 7, stage clip 6, needle roller cage 5, clamping nut 4 and other parts. Both the rigid mandrel 1 and the tapered needle roller 7 are manufactured with taper, the taper of the tapered needle roller is equal to 1/2 of the taper of the rigid mandrel, the number of tapered needle rollers is determined by the size of the inner hole of the processed gear part, generally 3 pieces Or more. The needle roller cage 4 has straight grooves on the circumference, the number of straight grooves is the same as that of the tapered needle rollers, and the axial direction of the tapered needle rollers in the grooves is matched with the straight grooves with a small clearance. Assemble according to Figure 2, that is, the compression spring 6 and the needle roller cage 5 are respectively set on the rigid mandrel 1, the tapered needle roller 7 is placed in the groove of the needle roller cage 5, and the clamping nut 4 is screwed on the rigid core on axis 1. When clamping, first loosen the clamping nut 4, put the processed gear 2 on, then tighten the clamping nut 4, push the needle roller cage 5 to move to the right, and at the same time, the needle roller cage 5 pushes the tapered needle roller 7 to the right Moving, the tapered needle roller and the rigid mandrel cooperate with the enlargement of the taper diameter to make the tapered needle roller 7 radially stretch out the inner hole of the expansion gear. When removing the workpiece, loosen the clamping nut 4, the compression spring 6 pushes the needle roller cage 5 to move to the left, and at the same time the needle roller cage 5 drives the tapered roller 7 to move to the left, and the tapered roller 7 can be removed from the workpiece .

Claims (2)

1. A mandrel fixture for disc gear processing, which includes a rigid mandrel (1), a clamping nut (4), a needle roller cage (5), a compression spring (6), and a tapered needle roller (7); It is characterized in that there is a tapered needle roller (7) between the rigid mandrel (1) and the workpiece (2), and the cooperation between the rigid mandrel (1) and the tapered needle roller (7) adopts a taper, and the taper directions of the two are opposite. The taper of the tapered needle roller (7) is 1/2 of the taper of the rigid core shaft (1). The tapered needle roller (7) is in the groove of the needle roller cage (5), and the needle roller cage (5) is set on the rigid core On the shaft (1), its outer end surface fits with the clamping nut (4), and the clamping nut (4) is connected with the rigid mandrel (1). 2. The mandrel clamp for disc gear processing according to claim 1, characterized in that: the compression spring (6) is set on the rigid mandrel (1), and its two ends are respectively supported on the needle cage (5) On the inner end face of the inner end face and the step of the rigid mandrel (1).

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