Eccentric inner hole machining tool

Abstract

The eccentric inner hole machining tool comprises a circular fixing disc, the rear side of the circular fixing disc is connected with a machine tool chuck, and an eccentric groove is formed in the front side face of the circular fixing disc. The positioning disc is in sliding connection with the groove through a sliding block, the position can be adjusted in the radial direction of the fixing disc, and the two sides of the sliding block are abutted against and positioned by ejector rods. An installation disc matched with a workpiece is fixedly installed on the positioning disc, the installation disc is rapidly and coaxially connected with the positioning disc through a connecting groove, and the workpiece is fixed through a bolt and a pressing strip. And an observation hole in the circle center of the positioning disc and an indication strip of the observation hole are matched with the scale marks, so that the eccentric distance can be accurately checked. According to the tool, the machining position of the eccentric hole of the workpiece can be rapidly positioned, machining of different eccentric distances is achieved by adjusting the positioning disc, and the production efficiency and the tool universality are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of eccentric hole machining technology, specifically to a tooling for machining eccentric inner holes. Background Technology

[0002] In the field of machining, machining eccentric internal holes has always been a challenging task. Traditionally, machining eccentric holes typically involves fixing the workpiece to a chuck on a machine tool. Operators must first rely on extensive experience and specialized measuring tools to accurately measure the machining position of the eccentric hole on the workpiece, attempting to determine its precise position relative to the machine tool coordinate system. However, because the measurement process is easily affected by factors such as the complexity of the workpiece shape and the accuracy of the measuring tools, each measurement often consumes a significant amount of time.

[0003] After measurement, a tedious adjustment process is required. Operators must repeatedly fine-tune the position of the workpiece on the chuck, gradually correcting the machining position through multiple trial cuts and measurement comparisons until the ideal state is achieved. This adjustment process not only requires a high degree of concentration but is also extremely time-consuming. This traditional machining method, due to the significant time consumed in the measurement and adjustment stages, results in extremely low overall production efficiency. It severely restricts the company's production progress and economic benefits, making it difficult to meet the current market's urgent demand for efficient production. Utility Model Content

[0004] In view of the problems pointed out in the background art, this utility model proposes an eccentric inner hole machining tool to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] An eccentric internal hole machining fixture includes a fixed plate.

[0007] The fixed disk is provided with a positioning disk, and the center of the positioning disk and the center of the fixed disk are spaced apart.

[0008] It also includes a mounting plate that is fixedly connected to the positioning plate, and the mounting plate has a mounting groove that is coaxial with the positioning plate.

[0009] The present invention is further configured such that a plurality of first fixing holes are provided on the fixed plate along the circumference of the mounting plate, and bolts are threaded into the first fixing holes. After the bolts are tightened, the bolt heads abut against the mounting plate.

[0010] The present invention is further configured such that the fixed plate is provided with multiple sets of second fixing holes along the circumference of the mounting plate, each set of second fixing holes includes two second fixing holes, a screw is threadedly connected to the second fixing hole, and a pressure strip connected to the two screws in the same set is also provided. The pressure strip is provided with a through hole connected to the screw and a nut connected to the screw.

[0011] The present invention is further configured such that the fixed plate is provided with a circular eccentric groove, and the positioning plate is adapted to and fixedly connected with the eccentric groove.

[0012] The present invention is further configured such that the mounting plate is provided with a connecting groove that is adapted to and connected to the positioning plate, and the connecting groove and the mounting groove are coaxially arranged.

[0013] The present invention is further configured such that the positioning disk can be adjusted in position along the radial direction of the fixed disk.

[0014] The present invention is further configured such that the fixed plate is provided with a sliding groove extending through both sides of it along its radial direction, the positioning plate is provided with a slider that is slidably connected to the sliding groove, the two ends of the sliding groove are provided with fixing blocks that are fixedly connected to the fixed plate, the fixing blocks are provided with screw holes, and also include push rods that are threadedly connected to the screw holes, and the two push rods abut against the two sides of the slider respectively.

[0015] The present invention is further configured such that the bottom of the slide groove is provided with scale lines, and also includes an observation hole that passes through the positioning plate and the slider, the observation hole being located at the center of the positioning plate.

[0016] The present invention is further provided with an indicator strip on the side wall of the observation hole that corresponds to the scale line.

[0017] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0018] The eccentric inner hole machining fixture provided by this utility model positions the eccentric hole of the workpiece for machining. This allows the workpiece to be directly machined simply by fixing it on the mounting plate, thus improving production efficiency.

[0019] During machining, the fixed plate is fixedly connected to the chuck on the machine tool, and the circular workpiece is then fixedly mounted on the mounting plate. The workpiece and the positioning plate are coaxially arranged, and the position on the workpiece corresponding to the rotation axis of the fixed plate is the center position of the eccentric hole to be machined. The distance between the center of the positioning plate and the center of the fixed plate is the eccentric distance of the eccentric hole (e.g., eccentricity 5mm). Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is an exploded view of the present invention. Figure 1 .

[0023] Figure 3 This is a cross-sectional view of the present invention.

[0024] Figure 4 This is an exploded view of the present invention. Figure 2 .

[0025] Figure 5 This is a schematic diagram of the structure of the groove and slider of this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the observation hole and indicator strip of this utility model.

[0027] The following are the labels in the attached diagram: 1. Fixed plate; 2. Positioning plate; 3. Mounting plate; 4. Mounting groove; 5. First fixing hole; 6. Bolt; 7. Second fixing hole; 8. Screw; 9. Pressure strip; 10. Nut; 11. Eccentric groove; 12. Connecting groove; 13. Sliding groove; 14. Sliding block; 15. Fixing block; 16. Top rod; 18. Observation hole; 19. Indicator strip. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] For reference as follows Figures 1-6 The present invention will be described as follows:

[0030] Example: An eccentric internal hole machining fixture includes a circular fixed plate 1. The rear side of the fixed plate 1 is fixed to the machine tool chuck by standard connecting parts such as bolts or locating keys to ensure that the fixed plate 1 rotates synchronously when the machine tool rotates. The front side of the fixed plate 1 serves as the mounting reference surface for the locating plate 2.

[0031] A circular positioning disc 2 is provided on the front side of the fixed disc 1. The center of the positioning disc 2 is spaced apart from the center of the fixed disc 1 (i.e., eccentric arrangement). The positioning disc 2 and the fixed disc 1 can be connected by bolt fastening or pin positioning to ensure that their relative positions are fixed. The eccentricity directly determines the eccentricity of the workpiece's eccentric hole (e.g., when the design eccentricity is 5mm, the distance between the two centers is 5mm).

[0032] It also includes a mounting plate 3 that is fixedly connected to the positioning plate 2. The mounting plate 3 is circular and is coaxial with the positioning plate 2. The mounting plate 3 is provided with a mounting groove 4 that is coaxial with the positioning plate 2. The mounting groove 4 is circular and its diameter is adapted to the outer diameter of the workpiece. The workpiece is fixed in the groove by means of a pressure plate, etc., to ensure that the workpiece rotates synchronously with the mounting plate 3.

[0033] During machining, the machine tool chuck drives the fixed plate 1 to rotate. Because the positioning plate 2 is eccentrically connected to the fixed plate 1, the mounting plate 3 and the workpiece move in a circular motion around the axis of the fixed plate 1 along with the positioning plate 2. At this time, there is a fixed eccentricity between the center of the workpiece (i.e., the center of the positioning plate 2) and the rotation axis of the fixed plate 1. This eccentricity is the eccentricity of the eccentric hole to be machined. Specifically, after the workpiece is fixed in the mounting slot 4, its geometric center coincides with the center of the positioning plate 2, and the distance between the rotation axis of the fixed plate 1 (i.e., the machine tool spindle axis) and the center of the positioning plate 2 is a preset eccentricity value. When the machine tool spindle rotates, the point on the workpiece corresponding to the axis of the fixed plate 1 is always at the center of the eccentric hole. The tool can be fed along the axis of the fixed plate 1 to machine the required eccentric hole without additional workpiece position adjustment or multiple clamping.

[0034] Simplified clamping process: Traditional eccentric hole machining requires marking and alignment processes to determine the eccentric position, which is time-consuming. This fixture uses the eccentric preset of the positioning plate 2 and the fixed plate 1 to directly locate the center of the eccentric hole after the workpiece is clamped, eliminating the need for manual alignment.

[0035] The mounting slot 4 of mounting plate 3 can be replaced with different specifications according to the workpiece diameter, which has strong adaptability. When changing workpieces, only mounting plate 3 needs to be removed or the positioning elements in the mounting slot need to be adjusted. There is no need to recalibrate the machine tool parameters, which significantly improves the changeover efficiency during mass production.

[0036] The front side of the fixed plate 1 is provided with a circular eccentric groove 11. The distance between the center of the eccentric groove 11 and the center of the fixed plate 1 is equal to the design eccentricity (e.g., 5mm). The positioning plate 2 is fitted and fixedly connected to the eccentric groove 11. The positioning plate 2 is fixedly connected to the fixed plate 1 by bolts.

[0037] The rear side of the mounting plate 3 has a connecting groove 12 at its center, which is adapted to connect with the positioning plate 2. The connecting groove 12 is a circular blind hole, and it is coaxially arranged with the mounting groove 4. By connecting the mounting groove 12 with the positioning plate 2, the mounting plate 3 can be quickly and accurately coaxially installed on the positioning plate 2. After the bolt 6 is tightened, the bolt head contacts the front side of the mounting plate 3, forming a clamping fixation.

[0038] The mounting plate 1 has multiple first fixing holes 5 along the circumference of the mounting plate 3. Bolts 6 are threaded into the first fixing holes 5. After the bolts 6 are tightened, the bolt head of the bolt 6 abuts against the front side of the mounting plate 3, thus pressing and fixing the mounting plate 3.

[0039] The improved clamping efficiency, achieved by the interlocking positioning of the eccentric groove 11 and the positioning plate 2, eliminates the need for traditional scribing and alignment steps. The connection groove 12 and the positioning plate 2 enable the "insertion-type" quick installation of the mounting plate 3. Combined with the pre-tightening of the bolts 6, the overall changeover time is reduced, making it suitable for multi-variety, small-batch production.

[0040] The fixed plate 1 has multiple sets of second fixing holes 7 along the circumference of the mounting plate 3. Each set of second fixing holes 7 includes two second fixing holes 7, with screws 8 internally threaded into each second fixing hole 7. It also includes a pressure strip 9 connected to the two screws 8 in the same set. The pressure strip 9 has through holes connected to the screws 8 and also includes nuts 10 connected to the screws 8. The workpiece on the mounting plate 3 is pressed and fixed by the pressure strip 9.

[0041] The screw 8 and the pressure bar 9 are coupled by the following mechanism: one end of the screw 8 is fully threaded, and the other end is machined into a smooth rod, which passes through the through hole of the pressure bar 9. The pressure bar 9 has a rectangular cross-section, and its length covers the outer circumference of the workpiece.

[0042] The quick-clamping advantage of the pressure bar structure is that it adopts a "screw + nut" quick-locking method, and the clamping time for a single workpiece is only 1-2 minutes, which is 80% shorter than the alignment time of traditional three-jaw chucks. Multiple pressure bars work simultaneously to complete the uniform circumferential clamping of the workpiece in one go, without the need for point-by-point adjustment, making it suitable for mass production.

[0043] The positioning plate 2 can be adjusted radially along the fixed plate 1 to process holes with different eccentric distances.

[0044] The front side of the fixed disk 1 has a radially extending groove 13 that runs through both sides. The positioning disk 2 has a slider 14 that is slidably connected to the groove 13 (the slider 14 is fixedly connected to the fixed disk 1 in the axial direction of the fixed disk 1). At both ends of the groove 13 are fixing blocks 15 that are fixedly connected to the fixed disk 1. The fixing blocks 15 have screw holes and also include push rods 16 that are threaded into the screw holes. The two push rods 16 abut against the two sides of the slider 14 respectively. The position of the slider 14 is adjusted by adjusting the position of the push rods 16 on both sides. The positioning disk 2 is fixedly mounted on the slider 14, thus adjusting the eccentricity of the positioning disk 2.

[0045] Loosen the top rods 16 on both sides to allow the slider 14 to slide freely. After adjusting its position, fix the slider 14 in place with the top rods 16 on both sides. Simultaneously tighten the top rods 16 on both sides to ensure that the slider 14 does not move.

[0046] The bottom of the slide 13 is provided with scale lines, and also includes an observation hole 18 that passes through the positioning disk 2 and the slider 14. The observation hole 18 is located at the center of the positioning disk 2. An indicator strip 19 corresponding to the scale lines is provided on the side wall of the observation hole 18. The distance of the positioning disk 2's off-center can be viewed through the observation hole 18 and the scale lines. When the positioning disk 2 is moved to the target scale (e.g., off-center 5mm), the scale line aligned with the indicator strip 19 can be read through the observation hole 18.

[0047] 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, improvements, etc., 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 tooling for machining eccentric inner holes, comprising a fixed disc, characterized in that: The fixed disk is provided with a positioning disk, and the center of the positioning disk and the center of the fixed disk are spaced apart. It also includes a mounting plate that is fixedly connected to the positioning plate, and the mounting plate has a mounting groove that is coaxial with the positioning plate.

2. The eccentric internal hole machining fixture according to claim 1, characterized in that: The fixed plate has multiple first fixing holes along the circumference of the mounting plate. Bolts are threaded into the first fixing holes. After the bolts are tightened, the bolt heads abut against the mounting plate.

3. The eccentric internal hole machining fixture according to claim 1, characterized in that: The fixed plate is provided with multiple sets of second fixing holes along the circumference of the mounting plate. Each set of second fixing holes includes two second fixing holes, with a screw threaded into the second fixing hole. It also includes a pressure strip connected to the two screws in the same set. The pressure strip is provided with a through hole connected to the screw and a nut connected to the screw.

4. The eccentric internal hole machining fixture according to claim 1, characterized in that: The fixed plate is provided with a circular eccentric groove, and the positioning plate is adapted to and fixedly connected to the eccentric groove.

5. The eccentric internal hole machining fixture according to claim 4, characterized in that: The mounting plate is provided with a connecting groove that is adapted to connect with the positioning plate, and the connecting groove and the mounting groove are coaxially arranged.

6. The eccentric internal hole machining fixture according to claim 1, characterized in that: The positioning plate can be adjusted in position along the radial direction of the fixed plate.

7. The eccentric internal hole machining fixture according to claim 6, characterized in that: The fixed plate has a sliding groove running through both sides along its radial direction. The positioning plate has a slider that is slidably connected to the sliding groove. The two ends of the sliding groove have fixing blocks that are fixedly connected to the fixed plate. The fixing blocks have screw holes and also include push rods that are threadedly connected to the screw holes. The two push rods abut against the two sides of the slider respectively.

8. The eccentric internal hole machining fixture according to claim 7, characterized in that: The bottom of the slide is provided with scale lines, and it also includes an observation hole that passes through the positioning plate and the slider. The observation hole is located at the center of the positioning plate.

9. The eccentric internal hole machining fixture according to claim 8, characterized in that: The observation hole has an indicator bar on its side wall that corresponds to the scale lines.

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