A centrifugal positioning adjusting tool and a centrifugal positioning adjusting method

Abstract

The application discloses a centrifugal positioning adjustment tool and a centrifugal positioning adjustment method, which comprise a main shaft vertical plate and an electromagnetic main shaft, a connecting plate is connected to the electromagnetic main shaft, a fixing rod is arranged on the connecting plate, a dial indicator mounting seat is arranged on the fixing rod, a right-angle positioning block is arranged on the main shaft vertical plate, a ball head top pin is arranged on the right-angle positioning block, an eccentric tool is further arranged on the main shaft vertical plate, two eccentric reference holes are arranged on the eccentric tool, the center of one hole is the center of the main shaft, and the center of the other hole is the center of a workpiece, the centrifugal positioning adjustment tool further comprises a tool support, the distance between the center of the workpiece and the right end surface of the tool support is equal to the distance between the center of the workpiece and the right end surface of the eccentric tool, and the distance between the center of the workpiece and the lower end surface of the tool support is equal to the distance between the center of the workpiece and the lower end surface of the eccentric tool. The application has the advantages that after one-time adjustment, the precision of batch products is highly consistent, and the positioning time is extremely short and the process steps are few.

Description

Technical Field

[0001] This invention relates to the field of mechanical manufacturing, specifically to a high-precision machining device and adjustment method for ring-shaped parts. Background Technology

[0002] Traditional internal grinding machines require a significant amount of time for position adjustment each time the tooling or support is changed or adjusted. Trial grinding of the workpiece is necessary to confirm whether the adjustment is appropriate, which greatly increases the auxiliary time of production. Furthermore, after trial grinding and adjustment, the roundness and coaxiality of the finished product will also show batch-to-batch deviations. Therefore, factories need an adjustment method to improve the accuracy of internal grinding processes, while also solving the problems of long positioning time and low accuracy. Summary of the Invention

[0003] To address the aforementioned problems, this invention discloses a centrifugal positioning adjustment fixture and a centrifugal positioning adjustment method. The device disclosed in this invention achieves highly consistent accuracy across batches of products after a single adjustment, with extremely short positioning time and fewer process steps.

[0004] The specific technical solution is as follows:

[0005] A centrifugal positioning and adjustment fixture includes a spindle plate, an electromagnetic spindle passing through the spindle plate, a connecting plate connected to the end face of the electromagnetic spindle by screws, a fixing rod vertically arranged at the center of the connecting plate, a dial indicator mounting base on the fixing rod, a lever dial indicator on the dial indicator mounting base, a right-angle positioning block on the spindle plate with three ball-head set screws, and an eccentric fixture on the spindle plate with two eccentric reference holes, one hole centered at the spindle center and the other hole centered at the center of the workpiece. The centrifugal positioning and adjustment fixture also includes a fixture support, the distance between the center of the workpiece and the right end face of the fixture support is equal to the distance between the center of the workpiece and the right end face of the eccentric fixture, and the distance between the center of the workpiece and the lower end face of the fixture support is equal to the distance between the center of the workpiece and the lower end face of the eccentric fixture.

[0006] The outer side of the tooling bracket abuts against the end of the ball head screw on the right-angle positioning block for positioning, and the inner arc surface of the tooling bracket contacts the outer circle of the annular workpiece for positioning.

[0007] This invention further discloses a centrifugal positioning adjustment method using the above-mentioned adjustment fixture, comprising the following steps:

[0008] 1): After installing the connecting plate on the end face of the electromagnetic spindle, install the fixing rod and dial indicator mounting base on the connecting plate;

[0009] 2): Prepare the right-angle positioning block and make the ball head screw on the right-angle positioning block in an active state. Prepare the eccentric fixture and place the eccentric fixture in the upper right of the electromagnetic spindle. That is, the two center lines of the electromagnetic spindle form a four-quadrant plane coordinate system. The eccentric fixture is located in the first quadrant of the plane coordinate system formed by the electromagnetic spindle. Apply a certain preload to the ball head screw for initial positioning.

[0010] 3): Use a lever dial indicator probe to contact the spindle center reference hole on the eccentric tooling, rotate the electromagnetic spindle, and adjust the three ball head screws on the right-angle positioning block according to the dial indicator reading to make the center of the spindle center hole on the eccentric tooling coincide with the center of the electromagnetic spindle.

[0011] 4) According to step 3), use the lever dial indicator probe to abut against the reference hole of the workpiece center on the eccentric fixture. Adjust the three ball-head screws on the right-angle positioning block according to the dial indicator reading. Alternately confirm steps 3) and 4) to obtain the positioning reference of the annular workpiece. Tighten and fix the ball-head screws, remove the eccentric fixture, and abut the fixture bracket against the three ball heads of the ball-head screws. Fix the fixture bracket on the spindle plate. At this time, the fixture bracket has the following characteristics: the distance between the workpiece center and the right end face of the fixture bracket is equal to the distance between the workpiece center and the right end face of the eccentric fixture; the distance between the workpiece center and the lower end face of the fixture bracket is equal to the distance between the workpiece center and the lower end face of the eccentric fixture.

[0012] The advantages of this invention are: fewer adjustment steps, and the centrifugal positioning adjustment method does not require the installation of a chuck to clamp the workpiece for positioning. Instead, it uses electromagnetic attraction to hold the end face of the workpiece, and the centrifugal force generated by the rotation of the electromagnetic spindle fixes the annular workpiece on the tooling bracket, resulting in higher roundness and coaxiality of the processed products. The precision of grinding annular workpieces of the same batch size is highly consistent, and there is no secondary fine adjustment step. After determining the positioning reference of the annular workpiece through the eccentric tooling, batch processing can be carried out, which greatly saves processing time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention;

[0014] Figure 2 A schematic diagram of the three-dimensional structure of the eccentric tooling;

[0015] Figure 3 A schematic diagram showing the positional structure of the eccentric tooling and the right-angle positioning block;

[0016] Figure 4 A half-section diagram of the eccentric tooling assembled on the spindle vertical plate;

[0017] Figure 5 Schematic diagram of the tooling support structure;

[0018] Figure 6 This is a schematic diagram of the eccentric tooling. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] A centrifugal positioning and adjustment fixture includes a spindle plate 10, an electromagnetic spindle 9 passing through the spindle plate 10, a connecting plate 2 connected to the end face of the electromagnetic spindle 9 by screws 1, a fixing rod 3 vertically arranged at the center of the connecting plate 2, a dial indicator mounting seat 6 on the fixing rod 3, a lever dial indicator 4 on the dial indicator mounting seat 6, a right-angle positioning block 7 on the spindle plate 10, the right-angle positioning block 7 having three ball-head set screws 8, and an eccentric fixture 12 on the spindle plate 10, the eccentric fixture 12 having two eccentric reference holes, such as... Figure 6 As shown, the center of one hole is the spindle center cs, and the center of the other hole is the workpiece center cw. The centrifugal positioning and adjustment fixture also includes a fixture support 15. The distance between the workpiece center cw and the right end face of the fixture support 15 is equal to the distance between the workpiece center cw and the right end face of the eccentric fixture 12. The distance between the workpiece center cw and the lower end face of the fixture support 15 is equal to the distance between the workpiece center cw and the lower end face of the eccentric fixture 12, i.e., a = A, b = B. Figure 5 , Figure 6 ).

[0021] The outer side of the tooling bracket 15 abuts against the end of the ball head screw 8 on the right-angle positioning block for positioning, and the inner arc surface of the tooling bracket contacts the outer circle of the annular workpiece 13 for positioning.

[0022] This invention further discloses a centrifugal positioning adjustment method using the above-mentioned adjustment fixture, comprising the following steps:

[0023] 1): After installing the connecting plate on the end face of the electromagnetic spindle, install the fixing rod and dial indicator mounting base on the connecting plate;

[0024] 2): Prepare the right-angle positioning block and make the ball head screw on the right-angle positioning block in an active state. Prepare the eccentric fixture and place the eccentric fixture in the upper right of the electromagnetic spindle. That is, the two center lines of the electromagnetic spindle form a four-quadrant plane coordinate system. The eccentric fixture is located in the first quadrant of the plane coordinate system formed by the electromagnetic spindle. Apply a certain preload to the ball head screw for initial positioning.

[0025] 3): Use a lever dial indicator probe to contact the spindle center reference hole on the eccentric tooling, rotate the electromagnetic spindle, and adjust the three ball head screws on the right-angle positioning block according to the dial indicator reading to make the center of the spindle center hole on the eccentric tooling coincide with the center of the electromagnetic spindle.

[0026] 4) Following step 3), use a lever dial indicator probe to abut against the reference hole at the center of the workpiece on the eccentric fixture. Adjust the three ball-head set screws on the right-angle positioning block according to the dial indicator reading, alternating between steps 3) and 4) to obtain the positioning reference for the annular workpiece. Tighten and fix the ball-head set screws, remove the eccentric fixture, and install the fixture bracket. Ensure that surface 15a of the fixture bracket abuts against ball head 8a, surface 15b abuts against ball head 8b, and surface 15c abuts against ball head 8c. Fix the fixture bracket to the spindle stand, ensuring that after installation, the center of the annular workpiece and the center of the electromagnetic spindle have a fixed eccentric dimension. At this point, the fixture bracket has the following characteristics: the distance between the center of the workpiece and the right end face of the fixture bracket is equal to the distance between the center of the workpiece and the right end face of the eccentric fixture; the distance between the center of the workpiece and the lower end face of the fixture bracket is equal to the distance between the center of the workpiece and the lower end face of the eccentric fixture.

[0027] The working principle of this invention is as follows: The annular workpiece is positioned by an electromagnetic chuck and a fixture bracket. The workpiece is eccentrically arranged with the electromagnetic spindle, and the annular workpiece is positioned to the upper right of the electromagnetic spindle. The annular workpiece is thrown onto the fixture bracket by the tangential force generated when the electromagnetic spindle rotates, with the direction being the same as the fixture bracket. The grinding head is mounted on the bed slide and can be moved in both the X and Y directions by a servo motor (e.g., ...). Figure 5 As shown, a grinding wheel is installed at the front end of the grinding head. The grinding wheel rotates and moves to the inner hole of the annular workpiece on the bed slide. While the grinding wheel rotates and oscillates, it moves towards the position of the tooling support to grind the inner surface of the annular workpiece. Since the distance between the grinding wheel and the tooling support is controllable, the annular workpiece produced has very high wall thickness and coaxiality. This processing device and adjustment method are suitable for high-precision machining of the inner hole of annular workpieces.

Claims

1. A centrifugal positioning and adjustment fixture, comprising a spindle upright plate, characterized in that: The electromagnetic spindle passes through the spindle support plate, and the connecting plate is connected to the end face of the electromagnetic spindle by screws. A fixing rod is vertically set at the center of the connecting plate, and a dial indicator mounting base is set on the fixing rod. A lever dial indicator is set on the dial indicator mounting base. A right-angle positioning block is set on the spindle support plate, and the right-angle positioning block is set with three ball-head set screws. An eccentric fixture is also set on the spindle support plate, and the eccentric fixture is set with two eccentric reference holes. The center of one hole is the spindle center, and the center of the other hole is the workpiece center. The centrifugal positioning adjustment fixture also includes a fixture support. The distance between the workpiece center and the right end face of the fixture support is equal to the distance between the workpiece center and the right end face of the eccentric fixture. The distance between the workpiece center and the lower end face of the fixture support is equal to the distance between the workpiece center and the lower end face of the eccentric fixture.

2. The centrifugal positioning and adjustment fixture according to claim 1, characterized in that: The outer side of the tooling bracket abuts against the end of the ball head screw on the right-angle positioning block for positioning, and the inner arc surface of the tooling bracket contacts the outer circle of the annular workpiece for positioning.

3. A centrifugal positioning adjustment method using the adjustment fixture described in claim 2, characterized in that, Includes the following steps: 1): After installing the connecting plate on the end face of the electromagnetic spindle, install the fixing rod and dial indicator mounting base on the connecting plate; 2): Prepare the right-angle positioning block and make the ball head screw on the right-angle positioning block in an active state. Prepare the eccentric fixture and place the eccentric fixture in the upper right of the electromagnetic spindle. That is, the two center lines of the electromagnetic spindle form a four-quadrant plane coordinate system. The eccentric fixture is located in the first quadrant of the plane coordinate system formed by the electromagnetic spindle. Apply a certain preload to the ball head screw for initial positioning. 3): Use a lever dial indicator probe to contact the spindle center reference hole on the eccentric tooling, rotate the electromagnetic spindle, and adjust the three ball head screws on the right-angle positioning block according to the dial indicator reading to make the center of the spindle center hole on the eccentric tooling coincide with the center of the electromagnetic spindle. 4) According to step 3), use the lever dial indicator probe to abut against the reference hole of the workpiece center on the eccentric fixture. Adjust the three ball-head screws on the right-angle positioning block according to the dial indicator reading. Alternately confirm steps 3) and 4) to obtain the positioning reference of the annular workpiece. Tighten and fix the ball-head screws, remove the eccentric fixture, and abut the fixture bracket against the three ball heads of the ball-head screws. Fix the fixture bracket on the spindle plate. The distance between the workpiece center and the right end face of the fixture bracket is equal to the distance between the workpiece center and the right end face of the eccentric fixture; the distance between the workpiece center and the lower end face of the fixture bracket is equal to the distance between the workpiece center and the lower end face of the eccentric fixture.

Images