Method and tooling for machining the inner diameter of a housing in an ultra-machining range

Abstract

This invention discloses a method and dressing fixture for machining the inner diameter of a housing beyond its machining range, relating to the field of grinding wheel dressing technology. First, the positioning surface of the fixture is aligned with the end face of the housing to be machined on the machine tool. The oblong hole on the positioning surface is aligned with any threaded hole on the end face of the housing, and a mounting screw is screwed in through the oblong hole. Then, the fixture is pushed along the radial force direction of the housing until the limiting pin on the positioning surface is tightly against the inner wall of the housing. The mounting screw is then tightened to fix the fixture to the end face of the housing. Next, a diamond dressing tool is installed on the fixture, its position is adjusted, and then it is fixed. Finally, based on the support of the housing, the fixture is kept stationary, and the grinding wheel is dressed using the diamond dressing tool. After dressing, the fixture is removed, and the dressed grinding wheel is used to machine the inner diameter of the housing. This invention can expand the grinding wheel dressing range of the machine tool, enabling the machining of housings beyond the machine tool's travel range, effectively improving the original machining capacity of the machine tool, increasing machining efficiency, and reducing costs.

Description

Technical Field

[0001] This invention relates to the field of grinding wheel dressing technology, and in particular to a method and dressing fixture for machining the inner diameter of a housing beyond its machining range. Background Technology

[0002] In traditional shell inner diameter machining processes, the dressing range of machine tool grinding wheels is limited by the factory design. For shells to be machined that exceed the machine tool's travel range, custom-made tooling or adjustments to machine tool parameters are often required. Even if the machine tool's clamping range and rotation capacity are sufficient, the inability to dress the grinding wheel necessitates replacing it with a larger machine tool, resulting in resource waste, low efficiency, and insufficient stability. Especially when dressing grinding wheels with a diamond dressing tool, conventional tooling struggles to achieve precise positioning within a confined space, easily leading to dressing deviations and affecting machining accuracy.

[0003] In the prior art, the grinding wheel is fixed on the grinding wheel spindle by a grinding wheel chuck. The grinding wheel chuck is responsible for firmly clamping the grinding wheel and transmitting power. The grinding wheel spindle, as the core component of the transmission system, transmits the speed and torque of the power source (such as an electric motor) to the grinding wheel, driving it to rotate to complete the grinding operation.

[0004] Therefore, there is an urgent need for a simple and precise dressing fixture and matching processing method to expand the processing range of machine tools, shorten the dressing space of grinding wheels, improve dressing stability and reduce processing costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and dressing fixture for machining the inner diameter of a housing beyond its machining range. This method can solve the problem that the dressing range of the machine tool grinding wheel exceeds the machine tool's stroke during the machining of the inner diameter of the housing. As long as the rotation and clamping range of the machine tool can meet the size requirements of the housing to be machined, the grinding wheel can be dressed stably and the housing can be machined normally.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a method for machining the inner diameter of a shell beyond its machining range, comprising the following steps:

[0007] Step 1: Align the positioning surface of the trimming fixture with the end face of the open end of the housing to be processed on the machine tool, align the oblong hole on the positioning surface with any threaded hole on the end face of the housing to be processed, and screw the mounting screw through the oblong hole into the threaded hole, but do not tighten it.

[0008] Step 2: Push the trimming fixture along the direction of the radial force on the shell to be processed, so that the trimming fixture moves along the waist-shaped hole until the limit pin on the positioning surface is in close contact with the inner wall of the shell to be processed. Tighten the mounting screws to fix the trimming fixture on the end face of the shell to be processed.

[0009] Step 3: Install the diamond pen on the dressing fixture, adjust the position of the diamond pen so that the head of the diamond pen faces the central axis of the shell to be processed, and the diamond pen abuts against the edge of the grinding wheel to be dressed on the machine tool, and then fix the diamond pen.

[0010] Step 4: Based on the support of the shell to be processed, keep the dressing fixture stationary, and dress the grinding wheel with the diamond pen on the dressing fixture. After dressing, remove the dressing fixture and use the dressed grinding wheel to process the inner diameter of the shell to be processed.

[0011] In a preferred embodiment, the contact force between the limiting pin and the inner diameter of the housing to be processed, along with the radial force in the trimming direction, forms a self-locking structure.

[0012] In a preferred embodiment, the axis of the diamond pen is perpendicular to the central axis of the housing to be processed.

[0013] On the other hand, the present invention also provides a trimming fixture for a method of machining the inner diameter of a housing beyond its machining range, comprising an L-shaped bracket, mounting screws, limit pins, fixing screws, and a diamond pen.

[0014] The L-shaped bracket includes a horizontal plate and a vertical plate that are fixedly connected. A fixing hole for mounting a diamond pen is provided in the middle of the horizontal plate. A fixing screw for fastening the diamond pen is installed at the end of the horizontal plate in a direction perpendicular to the axis of the fixing hole. The diamond pen passes through the fixing hole and the head of the diamond pen is away from the vertical plate.

[0015] The vertical plate of the L-shaped bracket is provided with a waist-shaped hole, mounting screws and a limiting pin. The length direction of the waist-shaped hole is consistent with the length direction of the vertical plate. The mounting screws are slidably installed in the waist-shaped hole, and the limiting pins are vertically fixed on the vertical plate and away from the direction of the horizontal plate.

[0016] Furthermore, the waist-shaped hole is located in the middle of the vertical plate of the L-shaped bracket, so that the mounting screw can move along the waist-shaped hole to adapt to housings with different wall thicknesses.

[0017] Furthermore, there are two limiting pins symmetrically arranged with the waist-shaped hole as the axis of symmetry.

[0018] Furthermore, the side of the vertical plate of the L-shaped bracket that faces away from the horizontal plate is the positioning surface, and the positioning surface is trapezoidal.

[0019] According to the above technical solution, the beneficial effects of the present invention are:

[0020] 1. The processing method of the present invention can directly complete the grinding wheel dressing on the machine tool without disassembling the grinding wheel or replacing the special dressing equipment, reducing downtime, expanding the grinding wheel dressing range of the machine tool, realizing the processing of the shell beyond the machine tool's travel, effectively improving the original processing capacity of the machine tool, increasing the processing efficiency of the machine tool, reducing processing costs, and helping to improve production efficiency.

[0021] 2. The dressing fixture in this invention has a simple structure, is easy to assemble and disassemble, saves equipment replacement time, and can effectively reduce costs and improve work efficiency during manufacturing and use. The dressing fixture has the advantages of reliable clamping and accurate diamond pen positioning. In addition, during the dressing process, the limiting pin is in close contact with the inner diameter of the housing, ensuring the stability of the dressing process, thereby improving the dressing accuracy of the grinding wheel and the dimensional consistency of the final inner diameter machining, and reducing machining errors. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the trimming tooling installation in the processing method of the present invention;

[0023] Figure 2 A 3D view for repairing tooling;

[0024] Figure 3 Rear view of the tooling being adjusted.

[0025] The markings in the diagram are: 1. Housing to be processed, 2. Grinding wheel spindle, 3. L-shaped bracket, 4. Mounting screw, 5. Fixing screw, 6. Diamond pen, 7. Grinding wheel, 8. Limit pin. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0028] It should also be noted that, unless otherwise stated, the terms "upper," "lower," "left," "right," "front end," "rear end," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of the present invention.

[0029] like Figure 1 As shown, a method for machining the inner diameter of a housing beyond its machining range includes the following steps:

[0030] Step 1: Align the positioning surface of the trimming fixture with the end face of the open end of the housing 1 to be processed on the machine tool, align the oblong hole on the positioning surface with any threaded hole on the end face of the housing 1 to be processed, and screw the mounting screw 4 through the oblong hole into the threaded hole, but do not tighten it.

[0031] Step 2: Push the trimming fixture along the radial force direction of the shell 1 to be processed, so that the trimming fixture moves along the waist-shaped hole until the limiting pin 8 on the positioning surface is tightly attached to the inner wall of the shell 1 to be processed. The tight force between the limiting pin 8 and the inner diameter of the shell 1 to be processed and the radial force in the trimming direction form a self-locking structure. Tighten the mounting screw 4 to fix the trimming fixture on the end face of the shell 1 to be processed.

[0032] The clamping force between the limiting pin and the inner wall of the housing, along with the radial force in the dressing direction, forms a self-locking structure. This structure automatically counteracts the radial force exerted by the grinding wheel on the tooling during machining, preventing tooling displacement or vibration and ensuring the stability of the dressing process. This improves the dressing accuracy of the grinding wheel and the dimensional consistency of the final inner diameter of the housing. Simultaneously, the self-locking structure reduces the frequency of manual calibration during machining, lessens reliance on operator experience, and enhances the reliability of the machining method.

[0033] Step 3: Install diamond pen 6 on the dressing fixture, adjust the position of diamond pen 6 so that the head of diamond pen 6 faces the central axis of the housing 1 to be processed, the axis of diamond pen 6 is perpendicular to the central axis of the housing 1 to be processed, and the diamond pen 6 abuts against the edge of the grinding wheel 7 to be dressed on the machine tool, and then fix the diamond pen.

[0034] The diamond pen axis is perpendicular to the central axis of the housing, ensuring uniform contact between it and the edge of the grinding wheel. The dressed grinding wheel profile is highly matched with the machining trajectory of the inner diameter of the housing, reducing machining errors.

[0035] Step 4: Based on the support of the shell 1 to be processed, keep the dressing fixture stationary, and dress the grinding wheel 7 with the diamond pen on the dressing fixture. After dressing, remove the dressing fixture and use the dressed grinding wheel to process the inner diameter of the shell 1 to be processed.

[0036] The processing method in this solution can directly complete the grinding wheel dressing on the machine tool without disassembling the grinding wheel or replacing it with a special dressing equipment, reducing downtime and making it particularly suitable for batch processing scenarios, significantly improving production efficiency; it also expands the grinding wheel dressing range of the machine tool, enabling the processing of the housing beyond the machine tool's travel range, effectively improving the machine tool's original processing capabilities, increasing processing efficiency, reducing processing costs, and helping to improve production benefits.

[0037] like Figure 2-3 As shown, the present invention also provides a trimming fixture, including an L-shaped bracket 3, mounting screws 4, limiting pins 8, fixing screws 5, and a diamond pen 6.

[0038] The L-shaped bracket 3 includes a horizontal plate and a vertical plate that are fixedly connected. A fixing hole for mounting the diamond pen 6 is provided in the middle of the horizontal plate. A fixing screw 5 for fastening the diamond pen 6 is installed at the end of the horizontal plate in a direction perpendicular to the axis of the fixing hole. The diamond pen 6 passes through the fixing hole and the head of the diamond pen 6 is away from the vertical plate.

[0039] The vertical plate of the L-shaped bracket 3 is provided with a waist-shaped hole, a mounting screw 4 and a limiting pin 8. The length direction of the waist-shaped hole is consistent with the length direction of the vertical plate. The mounting screw 4 is slidably installed in the waist-shaped hole. The limiting pin 8 is vertically fixed on the vertical plate and away from the direction of the horizontal plate. The waist-shaped hole is located in the middle of the vertical plate of the L-shaped bracket 3 so that the mounting screw 4 can move along the waist-shaped hole to adapt to the shell with different wall thicknesses.

[0040] The oblong hole is set along the length of the vertical plate, allowing the mounting screw to slide inside the oblong hole. Combined with the symmetrical layout of the limit pin, it can be adapted to housings with different wall thicknesses or inner diameters, thus expanding the application range of the tooling.

[0041] Two balancing pins (8) are symmetrically arranged around the oblong hole as the axis of symmetry. This arrangement ensures even contact with the inner wall of the housing when the tooling is pushed, balancing the force during radial adjustment and preventing misalignment caused by unilateral compression. This improves compatibility with housings of different inner diameters. Simultaneously, the symmetrical layout and self-locking structure of the balancing pins avoid the risk of deformation during thin-walled housing machining, increasing the yield rate of thin-walled parts.

[0042] The vertical plate of the L-shaped bracket 3 has a positioning surface on the side facing away from the horizontal plate. The positioning surface is trapezoidal. The trapezoidal positioning surface design can better fit with the end face of the housing, reduce the installation gap, ensure the coaxiality of the tooling and the machining reference surface, and avoid machining deviations caused by clamping eccentricity.

[0043] The dressing fixture in this solution has a simple structure and is easy to assemble and disassemble, saving equipment replacement time. It can effectively reduce costs and improve work efficiency during manufacturing and use. The dressing fixture has the advantages of reliable clamping and precise diamond pen positioning. During the dressing process, the limit pin is in close contact with the inner diameter of the housing, ensuring the stability of the dressing process, thereby improving the dressing accuracy of the grinding wheel and the dimensional consistency of the final inner diameter machining, and reducing machining errors.

[0044] When the shell has other shapes, the shell inner diameter machining method of the present invention with the super-machining range can also be used. It needs to be used in conjunction with additional dressing fixtures to dress the machine tool grinding wheel and machine the shell. For example, for a square shell, two dressing fixtures with an outer circle and an inner square are needed to fit the square shell inside, supported by a double center support, to dress the grinding wheel.

[0045] By dressing the machine tool grinding wheel with a simple dressing fixture, the limitations of the machine tool's stroke can be overcome, enabling high-precision machining of large-sized or irregularly shaped housing inner diameters and expanding the machine tool's machining capabilities.

[0046] It should be noted that the above embodiments are only used to illustrate the present invention, but the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for machining the inner diameter of a housing beyond its machining range, characterized in that, Includes the following steps: Step 1: Fit the positioning surface of the trimming fixture with the end face of the open end of the housing (1) to be processed on the machine tool, align the waist-shaped hole on the positioning surface with any threaded hole on the end face of the housing (1) to be processed, and screw the mounting screw (4) through the waist-shaped hole into the threaded hole, but do not tighten it. Step 2: Push the trimming fixture along the radial force direction of the shell (1) to be processed, so that the trimming fixture moves along the waist-shaped hole until the limit pin (8) on the positioning surface is close to the inner wall of the shell (1) to be processed. Tighten the mounting screw (4) to fix the trimming fixture on the end face of the shell (1) to be processed. Step 3: Install the diamond pen (6) on the dressing fixture, adjust the position of the diamond pen (6) so that the head of the diamond pen (6) faces the central axis of the shell (1) to be processed, and the diamond pen (6) abuts against the edge of the grinding wheel (7) to be dressed on the machine tool, and then fix the diamond pen. Step 4: Based on the support of the shell (1) to be processed, keep the dressing fixture stationary, and dress the grinding wheel (7) with the diamond pen (6) on the dressing fixture. After dressing, remove the dressing fixture and use the dressed grinding wheel to process the inner diameter of the shell (1) to be processed. The processing method is implemented using a trimming fixture, which includes an L-shaped bracket (3), mounting screws (4), limit pins (8), fixing screws (5), and a diamond pen (6). The L-shaped bracket (3) includes a horizontal plate and a vertical plate that are fixedly connected. A fixing hole for mounting a diamond pen (6) is provided in the middle of the horizontal plate. A fixing screw (5) for fastening the diamond pen (6) is installed at the end of the horizontal plate in a direction perpendicular to the axis of the fixing hole. The diamond pen (6) passes through the fixing hole and the head of the diamond pen (6) is away from the vertical plate. The vertical plate of the L-shaped bracket (3) is provided with a waist-shaped hole, a mounting screw (4) and a limiting pin (8). The length direction of the waist-shaped hole is consistent with the length direction of the vertical plate. The mounting screw (4) is slidably installed in the waist-shaped hole. The limiting pin (8) is vertically fixed on the vertical plate and away from the direction of the horizontal plate.

2. The method for machining the inner diameter of a housing beyond its machining range according to claim 1, characterized in that: The limiting pin (8) forms a self-locking structure by the tight contact force between the inner diameter of the shell (1) to be processed and the radial force in the trimming direction.

3. The method for machining the inner diameter of a housing beyond its machining range according to claim 1, characterized in that: The axis of the diamond pen (6) is perpendicular to the central axis of the housing (1) to be processed.

4. The method for machining the inner diameter of a housing beyond its machining range according to claim 1, characterized in that: The waist-shaped hole is located in the middle of the vertical plate of the L-shaped bracket (3) so that the screw (4) can be moved along the waist-shaped hole to adapt to shells with different wall thicknesses.

5. The method for machining the inner diameter of a housing beyond its machining range according to claim 1, characterized in that: The limiting pin (8) is symmetrically arranged in two with the waist-shaped hole as the axis of symmetry.

6. The method for machining the inner diameter of a housing beyond its machining range according to claim 1, characterized in that: The vertical plate of the L-shaped bracket (3) facing away from the horizontal plate is the positioning surface, which is trapezoidal.

Images