CN204308646U - The Automatic-clamping centering machine of specific number of teeth gear ring class part - Google Patents

Abstract

The utility model relates to an automatic clamping and centering mechanism for ring gear parts with a specific number of teeth, which solves the problem that there is no suitable automatic centering fixture for such parts at present. It includes clamp body, four-jaw chuck, two-jaw positioning claw, pressing mechanism and single-jaw positioning claw. There is a centering plate on the bottom of the clamp body, and a support block on the upper surface for supporting and positioning. The four-jaw chuck and The clamp body is concentric and installed on the clamp body. Both the two-jaw positioning claw and the single-jaw positioning claw include a handle and a head that is bent vertically upward. The head has a retractable positioning claw. The handles of the two positioning claws It is connected with the "cross" concave groove of the four movable jaws of the four-jaw chuck, wherein two two-jaw positioning jaws are opposite and two single-jaw positioning jaws are opposite, and the pressing mechanism is installed on the supporting block. The device realizes accurate machining positioning and convenient clamping, and is fully suitable for the machining and production of such workpieces.

Description

Automatic Clamping and Centering Mechanism for Specific Number of Teeth Ring Gear Parts

Technical field:

The utility model relates to an automatic clamping and centering mechanism for ring gear parts, in particular to an automatic clamping and centering mechanism for ring gear parts with a specific number of teeth.

Background technique:

The applicant produces a ring gear with 14 working teeth, and the coaxiality between the internal seam and the tooth root circle and the index circle is required to be less than or equal to 2 after processing. In order to ensure the coaxiality of the dedendum circle, the index circle and the inner seam, the root circle and the index circle of the tooth must be selected for positioning when machining the inner seam circle. However, because the tooth shape is cast, although the surface quality and dimensional accuracy are high, there is no suitable self-centering fixture for clamping. In the past, it was not possible to directly align with the meter head in the actual processing, and the bamboo branches were used for alignment. The runout value 2 cannot be guaranteed and can only be judged by experience, so about 20% of the products are out of tolerance. On the other hand, due to casting, the coaxiality between the indexing circle and the front face of the process is generally not within 2, resulting in the coaxiality between the size of the inner stop and the indexing circle cannot meet the requirements of the drawing, so that the product quality cannot be guaranteed, resulting in Super poor product.

Invention content:

The utility model analyzes the characteristics of the parts, and solves the problem that there is no suitable self-centering fixture for this kind of parts at present by providing a clamp that can be automatically centered.

The utility model is realized by the following technical solutions:

An automatic clamping and centering mechanism for ring gear parts with a specific number of teeth, including a clamping body, a four-jaw chuck, a two-jaw positioning claw, a pressing mechanism and a single-jaw positioning claw. The bottom of the clamping body has a centering plate, and the upper surface There is a supporting block on the top for supporting and positioning. The four-jaw chuck is concentric with the clamp body and installed on the clamp body. Both the two-jaw positioning claw and the single-jaw positioning claw include a handle and a head that is bent vertically upward. There are retractable positioning claws on the top, and the handles of the two positioning claws are connected with the "cross" concave grooves of the four movable claws of the four-jaw chuck. Among them, the positioning claws of the two claws are opposite, and the positioning claws of the single claw are opposite. The mechanism is mounted on the support block.

The retractable positioning claw is composed of a bolt screwed on the head and an arc protrusion on the head of the bolt.

The shanks of the two positioning claws are connected with the "cross" concave grooves of the four movable claws of the four-jaw chuck with "cross" convex blocks, and are fastened with countersunk screws.

The device realizes accurate machining positioning and convenient clamping, and is fully suitable for the machining and production of such workpieces.

Description of drawings:

Fig. 1 is the working drawing of the utility model processing ring gear;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a structural representation of the utility model;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is the schematic diagram of clamp body;

Figure 6 is a top view of Figure 5;

Fig. 7 is a schematic diagram of a single claw positioning claw;

Figure 8 is a top view of Figure 7;

Fig. 9 is a schematic diagram of two claw positioning claws;

Figure 10 is a top view of Figure 9;

Figure 11 is a structural schematic diagram of the installation of the positioning claw and the four-jaw chuck;

Fig. 12 is the A-A sectional view of Fig. 11;

Fig. 13 is a schematic diagram of the ring gear of the embodiment;

FIG. 14 is a top view of FIG. 13 .

Detailed ways:

As shown in Figures 13 and 14, the ring gear used for processing by the utility model has 14 teeth. According to the characteristics of the ring gear part itself, the structure of the workpiece itself is analyzed first, starting from the tooth root circle and the index circle: Since the workpiece itself has 14 teeth, which is not a multiple of 3 and 4, directly using a three-jaw or four-jaw chuck with soft jaws cannot achieve direct self-centering. Therefore, according to the structural characteristics of the workpiece, two kinds of positioning jaws are designed. The single-jaw positioning pawl 5 shown in Fig. 7,8 clamps a tooth slot, and the two-jaw positioning pawl 3 shown in Fig. 9,10 decides two tooth slots simultaneously, and they are respectively contained on the corresponding movable paw of four-jaw chuck. In this way, the positioning claw can realize six-point fixed circle (see Figures 1 and 2), and can be automatically adjusted according to the workpiece.

As shown in Figure 1-12, the utility model is an automatic clamping and centering mechanism for ring gear parts with a specific number of teeth, including clamp body 1, four-jaw chuck 2, two-jaw positioning claw 3, pressing mechanism 4 and Single-jaw positioning claw 5, centering disc 6 at the bottom of clamp body 1, centering disc 6 is installed in the positioning hole of the machine tool table, connected tightly with "T"-shaped screw nuts, and there are 4 supporting positions on the upper surface The supporting block of the function forms the supporting part of the end face positioning surface. After the four-jaw chuck 2 and the clamp body 1 are positioned, they are fastened with three screws to play the role of supporting the mother body. The two-claw positioning claw 3 and the single-claw positioning claw 5 both include a handle and a head that is vertically bent upwards. The head has a retractable positioning claw. The arc protrusion of the part is formed. The handles of the two positioning claws are connected with the "cross" concave grooves of the four movable claws of the four-jaw chuck, and the "cross" convex blocks are matched with the "cross" concave grooves, fastened with countersunk screws, and the compression mechanism 4 Mounted on the support block

Example:

Figures 13 and 14 are the workpieces to be processed. According to the requirements of the drawings, the concentricity requirements of the dedendum circle, the index circle and the internal stop are relatively high. Circle positioning (because it is casted in the same model as the indexing circle, the coaxiality is relatively high, as shown in Figure 1 and 2), a special self-centering fixture is designed, and a four-jaw self-centering chuck is used to move six One-point positioning, install adjustable jacking wire (retractable positioning claw) on the six points of the positioning claw, according to the actual situation of the blank of the part during processing, the six points are adjusted and aligned, and then the six points are adjusted with a dial gauge to make it It is coaxial with the rotary axis of the machine tool, and then locked and fixed, so that the parts can be processed after positioning and clamping. The positioning surface of the end face is also designed to ensure that the parts will not move during cutting, so that the coaxiality requirements of the ring gear after processing are fully guaranteed. The device realizes accurate machining positioning and convenient clamping, and is fully suitable for the machining and production of such workpieces.

Claims (3)

1. An automatic clamping and centering mechanism for ring gear parts with a specific number of teeth, which is characterized in that it includes a clamping body, a four-jaw chuck, a two-jaw positioning claw, a pressing mechanism and a single-jaw positioning claw, and the bottom of the clamping body has a The centering plate has a supporting block on the upper surface for supporting and positioning. The four-jaw chuck is concentric with the chuck body and is installed on the chuck body. Both the two-jaw positioning claw and the single-jaw positioning claw include the handle and vertically upward There are retractable positioning claws on the head, and the handles of the two positioning claws are connected with the "cross" concave grooves of the four movable claws of the four-jaw chuck. Among them, the positioning claws of the two claws are opposite, and the single claw The positioning claws are opposite, and the pressing mechanism is installed on the support block. 2. The automatic clamping and centering mechanism for ring gear parts with a specific number of teeth according to claim 1, characterized in that: the retractable positioning claw is protruded by the bolt screwed on the head and the arc of the bolt head constitute. 3. The automatic clamping and centering mechanism for ring gear parts with a specific number of teeth according to claim 1 or 2, characterized in that: the handles of the two positioning claws adopt a "cross" convex block and a four-jaw chuck The "cross" concave grooves of the four movable claws are connected and fastened with countersunk screws.