Lathe fixture for machining internal threads of parts
The utility model relates to a work piece holder who uses when utilizing lathe processing part internal thread belongs to workshop tool technical field.
When a lathe is used for turning a workpiece, the workpiece is firstly fixed on a main shaft of the lathe and is coaxial with the main shaft, and the clamping precision directly influences the machining precision. The traditional workpiece clamping method generally adopts a three-jaw chuck to clamp the outer cylindrical surface of a workpiece, and if the workpiece is in an irregular non-circular shape, a four-jaw chuck is needed to be used for alignment and then clamping. If the workpiece is too large and heavy, the chuck is difficult to ensure firm clamping, lathe auxiliary tools such as a center frame or a tip are needed, but the tip cannot be used when the inner hole of the workpiece needs to be machined. For a workpiece which cannot use a center frame or a tip due to irregular appearance, a complex combined clamp is usually required to be designed to assist clamping, the clamping process is complex, the clamping efficiency is low, the requirement on the technical level of an operator is high, the processing cost of the workpiece is too high, the design and operation of the combined clamp are greatly influenced by human factors, and certain influence is also caused on the processing precision of the part.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a drawback to prior art provides a be used for processing part internal screw thread turning attachment to thoroughly solve the clamping problem of irregular work piece, improve the machining precision and the machining efficiency of work piece, reduce the processing cost.
The problem of the utility model is realized with following technical scheme:
a lathe fixture for machining internal threads of parts comprises a plurality of folding press plates, a top pin corresponding to each folding press plate, a fixed press plate, an annular movable press plate and a threaded sleeve, wherein the fixed press plate, the annular movable press plate and the threaded sleeve are coaxial with a lathe spindle, the fixed press plate is fixed on the lathe spindle through a lathe rivet, the threaded sleeve is positioned on one side of the fixed press plate, which is far away from the lathe spindle, and is matched with the fixed press plate through threads, the movable press plate is fixed on the threaded sleeve, the folding press plates lean against one side of the fixed press plate, which is close to the lathe spindle, and are uniformly distributed around the axis of the spindle, the outer end of each folding press plate is clamped on a step in a threaded hole of a workpiece to be turned, the inner end of each folding press plate is rotatably connected with the fixed press plate, the top pin is.
According to the lathe fixture for machining the internal threads of the part, the inner end of the folding pressing plate is rotatably connected with the fixed pressing plate through the pin shaft, and the clamp spring is arranged between the folding pressing plate and the fixed pressing plate.
Above-mentioned a turning attachment for processing part internal thread, remove the pressure disk and adorn on the thread bush through its centre bore cover, remove one side of pressure disk and lean on the halfpace on the outer cylinder of thread bush, the opposite side is spacing by the circlip who installs on the thread bush.
The lathe fixture for machining the internal thread of the part further comprises one or more guide screws parallel to a lathe spindle, and the guide screws penetrate through guide holes in the movable pressure plate and are connected with the fixed pressure plate.
The lathe fixture for machining the internal threads of the part is characterized in that the number of the folded pressing plates is 3-4, and the number of the ejector pins corresponding to each folded pressing plate is 2.
The utility model discloses use with the cooperation of lathe blind rivet and center lathe four-jaw chuck, utilize the work piece hole to realize pressing from both sides tightly to the work piece, not only can guarantee the clamping precision of large-scale work piece, improve the processingquality and the machining efficiency of work piece, can reduce moreover that the work piece processing cost is low, be suitable for the batch production of work piece. Furthermore, the utility model discloses still have simple structure, low cost, advantages such as reliability height.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 and 2 are views from two different angles of the present invention;
fig. 3 is a cross-sectional view of the present invention;
FIG. 4 is a workpiece requiring internal threading;
fig. 5 is a schematic view of the clamping of the workpiece of fig. 4.
The figures are labeled as follows: 1. the device comprises a folding pressing plate, 2, a fixed pressing plate, 3, a threaded sleeve, 4, a movable pressing plate, 5, a pin shaft, 6, a clamp spring, 7, an elastic retainer ring, 8, a top pin, 9, a guide screw, 10, a split pin, 11, a workpiece, 12 and a blind rivet.
The utility model provides a lathe fixture of firm clamping work piece fast, this anchor clamps do not receive the influence of work piece shape for carry out the turning to the work piece internal thread, can guarantee work piece processingquality in, accelerate the production beat, reduce the processing cost of work piece.
Referring to fig. 1-3, the utility model mainly comprises a folding pressure plate 1 pressed on a workpiece to be processed, a fixed pressure plate 2 fixed on a lathe spindle by a blind rivet 12, a thread bush 3 used for loosening and clamping the workpiece and a movable pressure plate 4, wherein, the fixed pressure plate 2 is provided with four folding pressure plates 1 through a pin shaft 5, a snap spring 6 is arranged between each folding pressure plate 1 and the fixed pressure plate 2, the thread bush 3 is arranged on the fixed pressure plate 2 through threads, the movable pressure plate 4 is arranged on the thread bush 3, an elastic collar 7 for shaft is arranged below the movable pressure plate 4 for limiting, the fixed pressure plate 2 is also provided with 8 top pins 8, one end of each top pin 8 is pressed by the movable pressure plate 4, the other end of each top pin props against the folding pressure plate 1, the fixed pressure plate 2 is also provided with four guide screws 9 used for guiding the movable pressure plate 4, the tail part of the pin shaft 5, the folding pressure plate 1 can be pressed or loosened on the workpiece 11 by rotating the threaded sleeve 3 through the ejector pin 8.
The working principle is as follows: referring to fig. 4 and 5, when machining an inner hole or an internal thread of a workpiece, the utility model is firstly sleeved on a blind rivet 12 of a lathe spindle, the workpiece 11 is sleeved on the utility model through the inner hole, then the workpiece 11 is clamped by a four-jaw chuck, the fixed pressure plate 2 is tensioned through the blind rivet 12, then the folding pressure plate 1 blocks the step surface of the inner hole of the workpiece 11, the workpiece 11 is clamped, and then the machining can be carried out; after the workpiece 11 is machined, the blind rivet 12 is loosened, the threaded sleeve 3 is rotated clockwise, the folded pressing plate 1 is tilted, so that the workpiece 11 is loosened, and then the workpiece 11 can be dismounted (before the workpiece is clamped again, the threaded sleeve 3 needs to be rotated anticlockwise, so that the folded pressing plate 1 is reset under the action of the clamp spring 6).
The utility model is simple in operation, the machining precision is high, and application scope is wide moreover, can be used as the interior screw thread turning attachment of multiple structure similar part.