CN205519696U - Anchor clamps expand in double tops - Google Patents

Abstract

The utility model discloses an anchor clamps expand in double tops, including tight head (2) and the bloated core subassembly in initiative top, the initiative tight head in top (2) has the cylinder of conical head for a front end, the core subassembly that expands is made up integratively by the tight dish (6) that expands in left side top, the tight dish (8) and connecting rod (7) that expands in right side top, the tight dish that expands in left side top has the outside tapering hole of macrostoma with the tight dish center of expanding in right side top, and the tapering hole is coaxial with the cylinder outer wall, left side top tightly expand dish and tight dish terminal surface along the central spurious radiation disconnection of expanding in right side top, and the disconnection degree of depth is to the connecting rod, and the tight dish that expands in left side top is through initiatively push up the tight distending in the tight top of the head, and the tight dish that expands in right side top pushes up tight distending by live center (9) that machine tool tailstock went up the installation. The utility model discloses a double tops point effort, anchor clamps expand in double tops struts, and the once required precision of dress card realization axiality has been guaranteed on being used in the hole reference surface of work piece to the masterpiece, has solved artifical timing work piece concentricity problem, and this anchor clamps expand in double tops does not need straight mouthful of machining center frame yet.

Description

Double top internal expansion fixture

technical field

The utility model relates to a clamp for mechanical processing of cylindrical workpieces, in particular to a double-roof internal expansion clamp.

Background technique

Cylinder workpiece machining fixture is a special equipment for cylinder workpiece. Affected by factors such as process conditions, equipment accuracy, and positioning methods, such fixtures that meet the process accuracy requirements and do not damage other surfaces of the workpiece are not mature at present in my country.

The processing requirements of cylinder workpieces are relatively high, especially for workpieces such as hydraulic cylinders that require concentricity and coaxiality, it is more difficult to guarantee. At present, the cylinder mouth processing of domestic hydraulic cylinders basically uses two methods: the center frame clamping and the cylinder center frame clamping. The clamping process of the center frame is complicated. By centering with the inner hole, machining the straight mouth of the center frame, and then fixing the center frame on the straight port, errors will occur in the second time of the workpiece, and the concentricity and straightness will be affected. When the workpiece rotates, the center frame will wear The wear and tear of the frame will also affect the accuracy of the workpiece, and the construction process has high comprehensive technical requirements for workers. Although hydraulic steady rests and double-spindle machine tools are available now, their prices are extremely expensive, and small businesses can't expect them. The production cost has also been greatly increased. In addition, many workpieces do not allow the straight opening of the machining center frame; the cylindrical center frame is a fixture widely used in recent years. It consists of a bearing support seat and four adjustment bolts. The bearing support seat is fixed. On the machine track, by adjusting the tightness of the four screws, the concentricity of the workpiece can be adjusted by adjusting the displacement of the workpiece. The power of the machine tool spindle is transmitted to the workpiece, and the rotation processing is realized through the bearing on the bearing support seat. This fixture also has the following problems: 1. The tightness of the four bolts is inconsistent, which will cause uneven force on the circumference of the workpiece, and the processed surface will be elliptical after the workpiece is taken off. 2. The bearing gap has a great impact on the processing quality, making it difficult for the precision and roughness of the workpiece to meet the requirements. 3. The technical quality of the workers is very high, and the labor intensity is very high when the workers adjust the workpiece.

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the utility model provides a double-roof internal expansion fixture, which not only solves the problem of the straight mouth of the machining center frame, but also solves the problem of manually adjusting the concentricity of the workpiece, and the circumference of the workpiece The force is uniform, which ensures the precision requirements of coaxiality in one clamping, and improves the precision and roughness.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a double-top internal expansion fixture, including an active tightening head and an expanding core assembly, the active tightening head is a cylinder with a conical head at the front end; The expansion core assembly is composed of the left top expansion disc, the right top expansion disc and the connecting rod. There is a tapered hole with a large opening in the center of the left top expansion disc and the right top expansion disc. The taper hole is coaxial with the outer wall of the cylinder. , the end face of the left top expansion disc and the right top expansion disc radiate outward along the center, and the disconnection depth reaches the connecting rod. The live center installed on the tailstock is tightly expanded.

Further, the end faces of the left top expansion disc and the right top expansion disc are divided into quarters radially outwards from the center.

Further, the active tightening head is made of stainless steel.

The taper hole in the center of one end of the tensioning disc of the utility model is centered by the active expansion head installed on the main shaft of the lathe; The disc expands, and the expansion force acts on the inner wall of the workpiece. The workpiece obtains the same concentricity and coaxiality as the precision of the machine tool and sufficient expansion force through the active expansion head and the movable center. force, the double-top internal expansion fixture is stretched, and the force acts on the inner hole reference surface of the workpiece, which ensures the accuracy of the concentricity in one clamping and solves the problem of manual adjustment of the workpiece concentricity. The double-top internal expansion fixture There is also no need to machine the straight mouth of the center rest.

Description of drawings

Fig. 1 is the working schematic diagram of the utility model;

Fig. 2 is a sectional view of the expansion core assembly;

Figure 3 is a left side view of the expansion core assembly.

detailed description

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

As shown in Figure 1, the double top internal expansion fixture of the utility model includes an active jacking head 2 and an expanding core assembly, the active jacking head 2 is a cylinder with a conical head at the front end; the expanding core assembly consists of The left top expansion disc 6, the right top expansion disc 8 and the connecting rod 7 are combined into one body. The center of the left top expansion disc 6 and the right top expansion disc 8 has a tapered hole with a large mouth outward, and the taper hole is coaxial with the outer wall of the cylinder. , the end faces of the left top expansion disc 6 and the right top expansion disc 8 radiate outward along the center, and the disconnection depth reaches the connecting rod 7. The tight expansion disc 8 is expanded by the live top 9 installed on the tailstock of the machine tool.

As shown in Fig. 2 and Fig. 3, the end faces of the left top tight expansion disc 6 and the right top tight expansion disc 8 are divided in quarters radially outward along the center. The end face of the clamping expansion disc radiates outward along the center, so that the clamping expansion disc can expand smoothly. It can be divided into 2 equal parts, 3 equal parts, 4 equal parts, etc. If the equal parts are too small, the expansion will not be smooth. Too many equal parts, too little contact area and inconvenient to make.

The active tightening head is made of stainless steel.

When the double-top internal expansion fixture is working, install an active clamping head 2 on the machine tool spindle or three-jaw chuck 1. The front end of the active clamping head 2 has a taper that completely matches the taper hole on the center of the left top expansion disc 6. . The active tightening head 2 transmits the power and coaxiality of the main shaft to the left tightening disc 6 . The other end of the double-top internal expansion clamp is tightened by the live top 9 of the machine tool tailstock. Under the action of the jacking force, the taper on the tip forces the left jacking disc 6 and the right jacking disc 8 to expand, and the expansion force acts on the inner wall of the workpiece 5 to realize the clamping force, the workpiece is firmly clamped, and the outer circle chamfering tool 3. Cutting tool 4 and internal chamfering tool 10 are used for cutting.

Claims (3)

1. A double top internal expansion fixture is characterized in that it comprises an active jacking head (2) and an expansion core assembly, and the active jacking head (2) is a cylinder with a conical head at a front end; The core assembly is composed of the left top expansion disc (6), the right top expansion disc (8) and the connecting rod (7). There is a large opening in the center of the left top expansion disc (6) and the right top expansion disc (8). Outward taper hole, the taper hole is coaxial with the outer wall of the cylinder, the end faces of the left top expansion disc (6) and the right top expansion disc (8) radiate outward along the center, and the disconnection depth reaches the connecting rod (7) , the left tight expansion disc (6) is tightened and expanded by the active tightening head (2), and the right tight expansion disc (8) is tightened and expanded by the live top (9) installed on the machine tool tailstock. 2. A double top internal expansion fixture according to claim 1, characterized in that the end surfaces of the left top expansion disc (6) and the right top expansion disc (8) radiate outward along the center and are quartered Indexing off. 3. A double top internal expansion fixture according to claim 1, characterized in that, the active tightening head (2) is made of stainless steel.