A quick initial positioning device for a magnetic disk and a workpiece

Abstract

The utility model relates to the technical field of machining, and specifically discloses a quick primary positioning device for a magnetic disc and a workpiece, which comprises a nylon plate with a groove, a nylon ejector pin and a screw. The groove of the nylon plate is adapted to the curvature of the circumferential surface of the magnetic disc to form a positioning reference, and two adjustable nylon ejector pins are arranged in two radial grooves, which are adjusted in length through the long holes and the screw. The device is provided with a poor-arc groove (central angle 135°) and a 120°-angle groove, and the ejector pin is pointed, narrow and provided with a scale line, so that the stability of the device is enhanced in cooperation with a specific tolerance and a flat washer. The device is made of nylon, which is magnetism-proof and scratch-proof, and the round corner transition reduces scratching. The device quickly guides the primary concentricity of the center of the workpiece and the center of the magnetic disc through symmetrical constraint, shortens the positioning time, controls the deviation within 0.5 mm, adapts to workpieces of multiple specifications, and improves the machining efficiency and precision.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically a device for rapid initial positioning of a disk and a workpiece. Background Technology

[0002] In the field of precision machining, the clamping table of vertical mill equipment typically adopts a magnetic disk structure. This magnetic disk, as the core clamping component, can stably attract large circular workpieces such as gears, bearing housings, and cylinder blocks using magnetic force, providing fundamental support for the one-time machining of inner holes, outer diameters, and end faces. During machining, the concentricity between the workpiece's center and the magnetic disk's rotation center directly determines the machining accuracy. Precise alignment between the two is a crucial prerequisite for ensuring the workpiece's dimensional accuracy and meeting geometric tolerance standards.

[0003] Currently, concentricity alignment during workpiece clamping relies primarily on manual operation: operators must place the workpiece on the surface of a magnetic disk and visually judge and adjust its position to align with the rotation center. This method is susceptible to operational experience and visual errors, leading to significant deviations between the workpiece center and the magnetic disk's rotation center. For subsequent processing, motion mills require time-consuming manual dial gauge adjustments, significantly increasing auxiliary time. While vertical mills have automatic rotation center adjustment functions, these functions are only effective within a deviation range of less than 0.5mm. If the deviation exceeds this range, precise adjustment cannot be achieved, potentially resulting in serious consequences such as machining errors and workpiece scrap.

[0004] Furthermore, existing positioning aids have significant drawbacks: some tooling is made of metal, which is prone to positional shift under the magnetic force of the magnetic disk, making it difficult to stably mount on the disk surface; and the hard contact between the metal and the disk or workpiece can easily scratch the working surface of the magnetic disk and the workpiece surface, affecting the quality of the equipment and the workpiece. At the same time, due to the lack of a dedicated mounting positioning structure, the workpiece is easily shifted due to gravity or magnetic attraction during manual adjustment, further exacerbating the positioning difficulty.

[0005] Therefore, there is an urgent need for a coarse positioning device that can be directly installed on the surface of the magnetic disk of a vertical mill. By adapting to the disk structure, it can achieve stable installation. By using non-magnetic materials, it can avoid magnetic interference and quickly guide the workpiece to achieve initial alignment between the center of the workpiece and the rotation center of the magnetic disk. This provides a reliable reference for subsequent fine adjustment by dial gauge or automatic center adjustment of the vertical mill, thereby reducing the time of manual alignment and improving the efficiency and stability of precision machining. Utility Model Content

[0006] To address the problems of low efficiency and large deviations in manual alignment during workpiece clamping of magnetic disks in existing vertical mills, as well as the susceptibility of traditional metal positioning fixtures to magnetic interference, surface scratches, and lack of stable mounting structures, this utility model aims to provide a rapid initial positioning device for the magnetic disk and workpiece. Through optimized structural design, it achieves stable mounting with the magnetic disk; it uses non-magnetic materials to avoid the influence of magnetic forces; and it combines an adjustable positioning structure to quickly guide the workpiece center to initial alignment with the disk's rotation center, thus providing an efficient and reliable initial positioning solution for precision machining. Therefore, the technical solution adopted by this utility model is as follows:

[0007] A device for rapid initial positioning of a disk and a workpiece, comprising:

[0008] The nylon sheet has a rectangular outline, with one long side recessed inward to form a groove with a radius of curvature equal to the radius of the circumference of the vertical grinding disk. Two slots extending radially along the groove are provided on its upper surface. The slots pass through the groove and the short side of the nylon sheet, and at least two screw holes are provided at the bottom of each slot.

[0009] Two nylon top rods are respectively embedded in two grooves and fit with the gap between the grooves. The rod body has a long strip hole extending along the length direction.

[0010] Four screws are threaded through the elongated holes of the two nylon top rods and then screwed into the screw holes at the bottom of the groove for fixation;

[0011] When the arcuate side of the groove forms a positioning reference with the circumferential surface of the vertical grinding disk, the inner ends of the two nylon push rods simultaneously contact the outer circumferential surface of the workpiece, thus achieving initial concentricity between the center of the workpiece and the rotation center of the vertical grinding disk.

[0012] Furthermore, the groove is a minor arc.

[0013] Furthermore, the groove extends radially along the recess.

[0014] Furthermore, the distance from the bottom of the groove to the lower surface of the nylon plate is greater than or equal to the thickness of the vertical mill's circular disk.

[0015] Furthermore, the inner end of the nylon top rod is tapered and narrowed.

[0016] Furthermore, the central angle corresponding to the groove is 135°, and the central angle corresponding to the two slots is 120°.

[0017] Furthermore, the nylon top rod has a rectangular cross-section, and its width has a tolerance of 0.1-0.3 mm for the gap between the groove and the groove width, and its thickness is 1.5-2 times the groove depth.

[0018] Furthermore, the screw is an internal hexagonal head screw with a head diameter greater than the width of the elongated hole, and a flat washer is provided between the lower surface of the head and the upper surface of the nylon push rod, with the outer diameter of the flat washer being greater than the diameter of the screw head.

[0019] Furthermore, the groove edge of the nylon plate is provided with a rounded transition, and the radius of the rounded transition is 0.5-1mm.

[0020] Furthermore, the upper surface of the nylon push rod is provided with scale lines extending along the length direction from the inner end as the starting point, with the scale lines spaced 1mm apart, to visually indicate the length of the push rod extending into the groove.

[0021] The beneficial technical effects of this utility model are as follows:

[0022] 1. Significantly improve positioning efficiency: The adjustable positioning structure of the nylon push rod can quickly guide the center of the workpiece to be initially concentric with the rotation center of the vertical mill's magnetic disk, eliminating the tedious process of traditional manual visual alignment, shortening the initial positioning time to less than 30 seconds, significantly reducing auxiliary time and improving processing efficiency.

[0023] 2. Ensuring positioning stability and accuracy: The curvature matching design of the groove and the outer circumference of the disk forms a reliable positioning reference. Combined with the symmetrical clamping of two radially extending grooves and pointed push rods, the initial positioning deviation can be controlled within 0.5mm, meeting the accuracy requirements of the vertical mill's automatic center adjustment and providing a stable foundation for subsequent finishing.

[0024] 3. Avoid magnetic interference and surface damage: The entire piece is made of nylon, which effectively avoids the magnetic influence of the magnetic disk and prevents the tooling from shifting its position. At the same time, the non-metallic material and rounded corner design can avoid hard contact with the disk working surface and the workpiece surface, reduce the risk of scratches, and protect the precision of the equipment and workpiece.

[0025] 4. Enhanced structural adaptability and operability: The nylon push rod achieves stepless adjustment through the elongated hole and screw, which can be adapted to round workpieces of different diameters; the scale lines on the surface of the push rod facilitate precise control of the adjustment amount, and with the quick-locking structure of the internal hex screw, the operation is convenient and the adjustment accuracy is controllable.

[0026] 5. Lightweight Design and Durability: The weight-reducing groove design of the nylon sheet achieves lightweighting while ensuring structural strength. The wear-resistant ridges and flat washers enhance the device's wear resistance and connection stability, extending the tooling's service life and reducing long-term operating costs. 1. Significantly Improved Anti-Drop Safety: A reliable locking mechanism is formed through the cooperation of spring force, stop bar, and anti-drop pressure plate. This effectively limits the relative sliding between the lifting rod and the three-pronged upper frame when no external force is applied, preventing synchronous inward retraction caused by accidental contact of the swing arm. This mechanically eliminates the risk of parts falling off during lifting, significantly improving operational safety. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 This is a schematic diagram of the structure of the nylon sheet of this utility model.

[0029] Figure 3 This is a schematic diagram of the nylon top rod of this utility model. Detailed Implementation

[0030] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] like Figure 1-3 The device shown is a rapid initial positioning device for a disk and a workpiece, comprising:

[0034] Nylon plate 1 has a rectangular outline, with one long side recessed inward to form a groove 11 with a radius of curvature equal to the radius of the circumference of the vertical grinding disk. Two slots 12 extending radially along the groove 11 are provided on its upper surface. The slots 12 pass through the groove 11 and the short side of the nylon plate 1, and each slot 12 has 4 screw holes 13 at the bottom.

[0035] Two nylon top rods 2 are respectively embedded in two grooves 12 and are fitted with the grooves 12 with a gap. The rod body has two long strip holes 21 extending along the length direction.

[0036] Four screws 3 pass through the elongated holes 21 of the two nylon top rods 2 and are screwed into the screw holes 13 at the bottom of the groove 12 for fixation;

[0037] When the arc side of the groove 11 forms a positioning reference with the circumferential surface of the vertical grinding disk, the inner ends of the two nylon push rods 2 simultaneously contact the outer circumferential surface of the workpiece, so as to achieve initial concentricity between the center of the workpiece and the rotation center of the vertical grinding disk.

[0038] coarse positioning process

[0039] 1. Device reference positioning: The nylon plate is attached to the circumference of the vertical grinding disk through the arc side of its groove. By using the design that the radius of curvature of the groove is equal to the radius of the circumference of the disk, the nylon plate and the vertical grinding disk form a stable positioning reference, ensuring that the center of the device itself is consistent with the rotation center reference of the disk.

[0040] 2. Pre-adjustment of the ejector pin: Based on the outer diameter of the workpiece to be processed, loosen the screws and move the nylon ejector pin radially along the groove. Adjust the length of the ejector pin extending into the groove through the elongated hole so that the distance between the inner ends of the two ejector pins matches the outer diameter of the workpiece. After adjustment, tighten the screws to fix the position of the ejector pin.

[0041] 3. Workpiece placement and positioning: The workpiece is hoisted onto the surface of the vertical mill disk, so that the outer circumference of the workpiece naturally fits the inner ends of the two nylon push rods. The symmetrical constraint of the push rods guides the workpiece to automatically adjust its position, and finally achieves the initial concentricity between the center of the workpiece and the rotation center of the vertical mill disk.

[0042] coarse positioning principle

[0043] 1. Principle of unified reference: The groove of the nylon plate is precisely matched with the curvature of the circumference of the vertical mill disk, forming a rigid positioning reference of "device-disk", ensuring that the installation position of the device itself is geometrically related to the rotation center of the disk, and providing a unified reference for subsequent workpiece positioning.

[0044] 2. Symmetrical constraint principle: Two grooves extend radially along the groove, making the adjustment direction of the nylon push rod consistent with the radial direction of the disk; the two push rods contact the outer circumference of the workpiece from a symmetrical direction, constraining the radial offset of the workpiece through two-point positioning, and using geometric symmetry to limit the center of the workpiece to a range close to the center of the disk rotation.

[0045] 3. Adjustable Adaptation Principle: The elongated hole of the push rod cooperates with the multi-screw hole of the groove to realize stepless adjustment of the push rod extension length. The positioning distance can be flexibly adjusted according to workpieces of different diameters. The adaptive design of the mechanical structure covers the coarse positioning requirements of various specifications of workpieces. Finally, the initial concentric calibration is completed through physical contact constraints.

[0046] In another preferred embodiment, the groove 11 is a minor arc. Designing the groove as a minor arc ensures a stable positioning reference with the outer circumferential surface of the vertical mill disk while reducing the contact area between the nylon plate and the disk. This avoids installation interference caused by over-positioning, reduces frictional damage to the disk surface during installation and removal, and improves the ease of device installation.

[0047] In another preferred embodiment, the groove 12 extends radially along the groove 11. The radial extension of the groove ensures that the adjustment direction of the nylon push rod is strictly aligned with the radial direction of the vertical mill disk, guaranteeing that the constraint force of the push rod on the workpiece is transmitted radially, avoiding positioning offset due to directional deviation, and significantly improving the alignment accuracy between the workpiece center and the disk rotation center.

[0048] In another preferred embodiment, the distance from the bottom of the groove 12 to the lower surface of the nylon plate 1 is greater than or equal to the thickness of the vertical mill's circular disk. This dimensional design ensures that the bottom of the groove will not interfere with the upper surface of the vertical mill disk when the nylon plate is installed, guaranteeing that the device can smoothly fit the edge of the disk, while reserving sufficient space for the disk to adsorb workpieces, avoiding the tooling structure from affecting the magnetic adsorption function of the disk.

[0049] In another preferred embodiment, the inner end of the nylon push rod 2 is tapered and narrowed. This tapered and narrowed inner end design reduces the contact area between the push rod and the outer circumference of the workpiece, minimizing positioning errors caused by minor unevenness on the workpiece surface. This allows the workpiece to quickly find a stable support position through point contact, improving the accuracy of initial positioning.

[0050] In another preferred embodiment, the central angle corresponding to the groove 11 is 135°, and the central angle corresponding to the two slots 12 is 120°. The 135° minor arc of the groove provides a sufficiently long contact surface to ensure the stability of the positioning reference, and the 120° included angle of the slots makes the two push rods symmetrically distributed, forming a balanced two-point constraint, which can effectively counteract the eccentric tendency when the workpiece is placed and ensure the force balance of the workpiece after positioning.

[0051] In another preferred embodiment, the nylon push rod 2 has a rectangular cross-section, with a width and groove width of 0.1-0.3 mm to fit the groove 12, and a thickness of 1.5-2 times the depth of the groove 12. The 0.1-0.3 mm clearance tolerance ensures that the push rod slides smoothly in the groove without significant wobbling, while the 1.5-2 times groove depth design allows the push rod to protrude from the nylon plate surface, facilitating manual adjustment and enhancing the structural rigidity of the push rod to prevent deformation during positioning.

[0052] In another preferred embodiment, the screw 3 is an internal hexagon head screw with a head diameter larger than the width of the elongated hole 21. A flat washer is provided between the lower surface of the head and the upper surface of the nylon push rod 2, and the outer diameter of the flat washer is larger than the diameter of the screw head. The internal hexagon head screw facilitates quick tool installation and removal, and the design of the flat washer having an outer diameter larger than the screw head increases the clamping area, effectively dispersing the pressure of the screw on the push rod, preventing deformation of the upper surface of the push rod due to excessive local force, and enhancing the anti-loosening effect of the screw fixation.

[0053] In another preferred embodiment, the groove 11 of the nylon plate 1 is provided with a rounded corner transition 111, the radius of which is 0.5-1mm. The 0.5-1mm rounded corner transition can eliminate the sharp edge of the groove, avoid scratching the outer peripheral surface of the vertical grinding disk during device installation or adjustment, reduce contact stress concentration, and protect the surface accuracy of the disk and the service life of the device itself.

[0054] In another preferred embodiment, the upper surface of the nylon push rod 2 is provided with scale lines extending along the length direction from the inner end, with the scale lines spaced 1mm apart, to visually indicate the length of the push rod extending into the groove 11. The 1mm interval scale lines, starting from the inner end of the push rod, visually indicate the length of the push rod extending into the groove. Operators can quickly calculate and adjust the required length based on the workpiece diameter, reducing trial and error and significantly improving the efficiency and accuracy of push rod adjustment.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for rapid initial positioning of a disk and a workpiece, characterized in that, include The nylon plate (1) has a rectangular outline, with one long side recessed inward to form a groove (11) with a radius of curvature equal to the radius of the circumference of the vertical grinding disk. Two slots (12) extending radially along the groove (11) are provided on its upper surface. The slots (12) penetrate the groove (11) and the short side of the nylon plate (1), and at least two screw holes (13) are provided at the bottom of each slot (12). Two nylon top rods (2) are respectively embedded in two grooves (12) and are fitted with the grooves (12) with a gap. The rod body has a long strip hole (21) extending along the length direction. Four screws (3) are threaded through the elongated holes (21) of the two nylon top rods (2) and then screwed into the screw holes (13) at the bottom of the groove (12) for fixation; When the arc side of the groove (11) forms a positioning reference with the circumferential surface of the vertical grinding disk, the inner ends of the two nylon push rods (2) simultaneously contact the outer circumferential surface of the workpiece, so as to achieve the initial concentricity between the center of the workpiece and the rotation center of the vertical grinding disk.

2. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The groove (11) is a minor arc.

3. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The groove (12) extends radially along the groove (11).

4. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The distance from the bottom of the groove (12) to the lower surface of the nylon plate (1) is greater than or equal to the thickness of the vertical mill circular disk.

5. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The inner end of the nylon top rod (2) is pointed and narrowed.

6. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The central angle corresponding to the groove (11) is 135°, and the central angle corresponding to the two slots (12) is 120°.

7. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The nylon top rod (2) has a rectangular cross section, and its width is within 0.1-0.3 mm of the groove width of the groove (12), and its thickness is 1.5-2 times the depth of the groove (12).

8. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The screw (3) is an internal hexagonal head screw with a head diameter greater than the width of the elongated hole (21) and a flat washer between the lower surface of the head and the upper surface of the nylon push rod (2). The outer diameter of the flat washer is greater than the diameter of the screw head.

9. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The nylon plate (1) has a rounded corner transition (111) at the edge of the groove (11), and the radius of the rounded corner transition (111) is 0.5-1mm.

10. The rapid initial positioning device for the disk and workpiece according to claim 1, characterized in that, The upper surface of the nylon push rod (2) is provided with scale lines extending along the length direction from the inner end as the starting point, with the scale lines spaced 1mm apart, which are used to visually indicate the length of the push rod extending into the groove (11).

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