Clamping mechanism for workpiece of outer circle multi-angle machining

Abstract

This utility model relates to a clamping mechanism for workpieces undergoing multi-angle machining of the outer diameter. Its features include: a machine body, a positioning seat mounted on the machine body, and a first positioning pin mounted on the positioning seat for positioning the inner bottom surface of the workpiece. The machine body has a pull rod that passes through the center of the positioning seat and can extend and retract along the workpiece's axial direction. The free end of the pull rod has a positioning groove. The outer end face of the workpiece has a through hole through which an anchor rod can pass. The first end of the anchor rod has an anchor head that can rotatably engage with the positioning groove. The second end of the anchor rod is fixedly connected to a cover plate with a hand handle. After the anchor rod is pulled by the pull rod, the cover plate presses against the outer end face of the workpiece to secure it to the positioning seat. This clamping mechanism eliminates the need for three hydraulic cylinders to press against three points on the workpiece to ensure clamping, thus avoiding interference from the three hydraulic cylinders during multi-angle machining of the outer diameter and preventing the fixture from being too large and exceeding the working stroke of the B-axis of the equipment.

Description

Technical fields:

[0001] This utility model relates to an installation and positioning mechanism for processing equipment, and in particular to a clamping mechanism for workpieces that are machined at multiple angles on their outer diameter. Background technology:

[0002] Some workpieces require machining at multiple angles on their outer diameter, and the product size is close to or exceeds the machining limit of the B-axis equipment. Traditional fixture design uses the center for positioning and then uses three hydraulic cylinders to clamp three points from the outside to ensure that the workpiece is flat. However, if the outer size of the product is too large, adding pressure points from the outside will result in a large fixture stroke, making the limit stroke of the B-axis equipment unusable.

[0003] For example, the Chinese patent "A jig for machining the outer circle of a stator core" (publication number CN220863289U) includes a base and an inner cylinder (4) concentrically arranged on the surface of the base. The stator core (2) to be machined is fitted on the outside of the inner cylinder (4). The feature is that a centering mechanism for positioning the concentricity of the stator core (2) is provided on the surface of the inner cylinder (4). The centering mechanism is a two-section type arranged along the axial direction. Multiple top pressing mechanisms (5) for axially pressing the stator core (2) are also arranged on the top of the inner cylinder (4). Although this jig achieves the clamping of cylindrical workpieces, it will interfere with the machining of workpieces when the device is applied to workpieces with multi-angle machining of the outer circle.

[0004] For example, the Chinese patent "A clamping fixture for automatically clamping a workpiece by means of a pull rod" (publication number CN209453205U) includes a spindle, a clamping body, a transition plate, and a connecting sleeve. The workpiece is placed on the right end of the spindle. The clamping body and the transition plate are connected as a whole and fixedly installed on the spindle. The connecting sleeve is connected to the machine tool pull rod through a first connecting end, and the connecting sleeve is connected to the lower left end of the clamping rocker arm through a second connecting end. The right end of the connecting sleeve is connected to the sleeve end cap by a thread. The upper end of the clamping body is rotatably connected to the clamping rocker arm through a supporting rotating pin. The left end of the clamping rocker arm and the rocker arm stop are located in the groove of the connecting sleeve. A clamping device is fixedly installed on the right end of the clamping rocker arm, and a clamping block is provided inside the clamping device. Similarly, when this device is used on workpieces with multi-angle external diameter machining, it will interfere with the machining of the workpiece. Utility model content:

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a clamping mechanism for workpieces with multi-angle machining of the outer diameter. The mechanism is reasonably designed and can clamp workpieces with multi-angle machining of the outer diameter without interfering with the machining of the outer diameter of the workpiece.

[0006] The present invention relates to a clamping mechanism for multi-angle machining of workpieces on an outer circle, characterized in that: it includes a machine body, a positioning seat on the machine body, and a first positioning pin on the positioning seat for positioning the inner bottom surface of the workpiece. The machine body is provided with a pull rod that passes through the center of the positioning seat and can extend and retract along the workpiece axial direction. The free end of the pull rod is provided with a positioning groove. The outer end face of the workpiece has a through hole through which an anchor rod can pass. The first end of the anchor rod is provided with an anchor head that can be rotatably engaged in the positioning groove. The second end of the anchor rod is fixedly connected to a cover plate with a hand handle. After the anchor rod is pulled by the pull rod, the cover plate is pressed against the outer end face of the workpiece to fasten the workpiece to the positioning seat.

[0007] Preferably, the positioning seat is provided with two parallel and spaced mounting blocks and a support block connected between the two mounting blocks, and the support block is provided with a mating hole in the middle for guiding the axial movement of the tie rod.

[0008] Preferably, the cross-section of the tie rod is polygonal, and the shape and size of the mating hole are the same as those of the tie rod.

[0009] Preferably, the positioning groove has two sections, the first section having a rectangular cross-section and the second section having a circular cross-section.

[0010] Preferably, the cross-section of the anchor head is the same as the first section of the positioning groove, and the two are fitted with a clearance so that the anchor head cannot be pulled out axially after passing through the first section of the positioning groove and rotating 90 degrees.

[0011] Preferably, the mounting block is equipped with an axially arranged second positioning pin, and the workpiece is provided with a positioning hole for the second positioning pin to pass through and be positioned.

[0012] Preferably, the aforementioned tie rod is driven to extend or retract by a hydraulic cylinder, pneumatic cylinder, or electric actuator.

[0013] The working method of the clamping mechanism for multi-angle machining of workpieces of this utility model is as follows: the workpiece is mounted on the positioning seat, the positioning pin is positioned on the inner bottom surface of the workpiece, the first end of the anchor rod is manually rotated and inserted into the positioning groove, the pull rod is activated to pull the anchor rod and the cover plate, and the cover plate is pressed against the outer end surface of the workpiece after the anchor rod is pulled by the pull rod, thereby realizing the workpiece is fastened on the positioning seat.

[0014] The clamping mechanism for multi-angle machining of the outer diameter of the workpiece of this utility model eliminates the need for three hydraulic cylinders to press against three points on the outside of the workpiece to ensure clamping, thereby avoiding interference from the three hydraulic cylinders in the multi-angle machining of the outer diameter of the workpiece, and also avoiding the problem of the fixture being too large and exceeding the working stroke of the B-axis of the equipment. Attached image description:

[0015] Figure 1 , 2 This is a three-dimensional view of the workpiece with multi-angle machining of the outer circle according to this utility model;

[0016] Figure 3 , 4 This is a perspective view of the clamping mechanism of this utility model;

[0017] Figure 5 This is a perspective view of the workpiece after it has been installed in the clamping mechanism of this utility model.

[0018] Figure 6 It is a three-dimensional diagram of the cover plate, anchor bolts, etc.

[0019] Figure 7 It is an exploded view of the cover plate, anchor bolts, and tie rods, etc.

[0020] Figure 8 This is an exploded view of the cover plate, anchor bolts, and tie rods from another perspective. Detailed implementation method:

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is exemplary and intended to provide further explanation of the present application; unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] The clamping mechanism for multi-angle machining of the outer circle of this utility model includes a body 1, a positioning seat 2 provided on the body 1, and a first positioning pin 4 provided on the positioning seat 2 for positioning the inner bottom surface 301 of the workpiece 3. The free end face of the first positioning pin 4 abuts against the inner bottom surface 301 of the workpiece 3.

[0023] Workpiece 3 is cylindrical, with its cylindrical end covered by positioning seat 2. The inner bottom surface 301 of workpiece 3 refers to the inner bottom surface away from the cylindrical opening, and the outer end surface 302 of workpiece 3 refers to the outer end surface away from the cylindrical opening.

[0024] The machine body 1 is provided with a pull rod 5 that passes through the center of the positioning seat 2 and can move axially along the workpiece (the pull rod can be driven to extend and retract by a hydraulic cylinder, air cylinder or electric push cylinder). The free end of the pull rod 5 is provided with a positioning groove 501. The outer end face 302 of the workpiece has a through hole 304, in which an anchor rod 6 can pass. The first end of the anchor rod 6 is provided with an anchor head 601 that can be rotated into the positioning groove 501. Specifically, the groove of the positioning groove 501 has two sections. The first section has a rectangular cross-section and the second section has a circular cross-section. The cross-section of the anchor head 601 is the same as the cross-section of the first section of the positioning groove (i.e., the cross-section of the anchor head 601 is rectangular). The cross-section of the anchor head 601 is clearance-fitted with the cross-section of the first section of the positioning groove. After the anchor head 601 extends into the first section of the positioning groove, it can rotate in the second section of the positioning groove so that after the anchor head passes through the first section of the positioning groove and rotates 90 degrees, it cannot be pulled out axially (but can be pulled out after rotating another 90 degrees or turning back 90 degrees). Thus, the pull rod is pulled axially, which drives the anchor rod to move.

[0025] The second end of the anchor rod is fixedly connected to a cover plate 7 with a handle 701 (the size of the cover plate 7 is larger than the diameter of the through hole 304, and the handle 701 is easy to manually pick up). After the anchor rod 6 is pulled by the pull rod, the cover plate 7 is pressed against the outer end face 302 of the workpiece 3, thereby securing the workpiece 3 to the positioning seat 2.

[0026] For a reasonable design, the positioning base 2 is provided with two parallel and spaced mounting blocks 201 and a support block 202 connected between the two mounting blocks. The support block 202 has a mating hole 203 in the middle for guiding the axial movement of the pull rod 5. The pull rod 5 has a polygonal cross section, and the shape and size of the mating hole are the same as those of the pull rod. The mating hole guides the pull rod when it moves in extension and retraction, preventing the pull rod from deviating from the axial direction during extension and retraction.

[0027] Each mounting block is equipped with an axially positioned second positioning pin 8, that is, there are two second positioning pins 8. The workpiece 3 is provided with a positioning hole 303 for the second positioning pin to pass through and position. The workpiece is axially limited by the positioning of the two second positioning pins 8.

[0028] The working method of the clamping mechanism for multi-angle machining of workpieces of this utility model is as follows: The workpiece is mounted on the positioning seat, and the positioning pin is positioned on the inner bottom surface of the workpiece. Two second positioning pins 8 pass through the positioning holes. The first end of the anchor rod is manually inserted into the positioning groove and rotated 90 degrees to prevent the anchor head from coming out of the positioning groove. The pull rod is activated to pull the anchor rod and the cover plate. After the anchor rod is pulled by the pull rod, the cover plate is pressed against the outer end surface of the workpiece, thereby realizing the workpiece is fastened on the positioning seat.

[0029] The clamping mechanism for multi-angle machining of the outer diameter of the workpiece of this utility model eliminates the need for three hydraulic cylinders to press against three points on the outside of the workpiece to ensure clamping, thereby avoiding interference from the three hydraulic cylinders in the multi-angle machining of the outer diameter of the workpiece, and also avoiding the problem of the fixture being too large and exceeding the working stroke of the B-axis of the equipment.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A clamping mechanism for workpieces undergoing multi-angle machining on their outer diameter, characterized in that: The device includes a body, a positioning seat on the body, and a first positioning pin on the positioning seat for positioning the inner bottom surface of the workpiece. The body has a pull rod that passes through the center of the positioning seat and can move axially along the workpiece. The free end of the pull rod has a positioning groove. The outer end face of the workpiece has a through hole through which an anchor rod can pass. The first end of the anchor rod has an anchor head that can be rotated and engaged in the positioning groove. The second end of the anchor rod is fixedly connected to a cover plate with a hand handle. After the anchor rod is pulled by the pull rod, the cover plate is pressed against the outer end face of the workpiece to secure the workpiece to the positioning seat.

2. The clamping mechanism for multi-angle machining of a workpiece on its outer diameter according to claim 1, characterized in that: The positioning seat is provided with two parallel and spaced mounting blocks and a support block connected between the two mounting blocks. The support block has a mating hole in the middle for guiding the axial movement of the tie rod.

3. The clamping mechanism for multi-angle machining of workpieces on the outer diameter according to claim 2, characterized in that: The cross-section of the pull rod is polygonal, and the shape and size of the mating hole are the same as those of the pull rod.

4. The clamping mechanism for multi-angle machining of workpieces on an outer diameter as described in claim 1, 2, or 3, characterized in that: The positioning groove has two sections: the first section has a rectangular cross-section, and the second section has a circular cross-section.

5. The clamping mechanism for multi-angle machining of a workpiece on its outer diameter according to claim 4, characterized in that: The cross-section of the anchor head is the same as the first section of the positioning groove, and the two are fitted with a clearance to prevent the anchor head from being pulled out axially after passing through the first section of the positioning groove and rotating 90 degrees.

6. The clamping mechanism for multi-angle machining of a workpiece on its outer diameter according to claim 2, characterized in that: The mounting block is equipped with an axially arranged second positioning pin, and the workpiece is provided with a positioning hole for the second positioning pin to pass through and be positioned.

7. The clamping mechanism for multi-angle machining of workpieces on an outer diameter as described in claim 1, 2, or 3, characterized in that: The pull rod is driven to extend and retract by a hydraulic cylinder, pneumatic cylinder, or electric pusher cylinder.

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