Precise adjustable large-diameter blind hole machining mechanism

Abstract

The utility model discloses a precise adjustable large-diameter blind hole machining mechanism which comprises a reamer ring, a cutter bar, a compensation type cutter handle, an adjusting expansion pin and a connecting piece. The reamer ring is connected to one end of the cutter bar in a sleeving mode and connected in a limiting mode through a first positioning spigot, and a positioning pin is arranged and connected with one end of the cutter bar in a positioning mode. The adjusting expansion pin is provided with a second positioning spigot and a conical limiting spigot; the second positioning spigot abuts against one end of the reamer rod for positioning, and the conical limiting spigot abuts against the inner conical end face of the reamer ring. The adjusting expansion pin is movably connected to one end of the cutter bar through a connecting piece; and the other end of the cutter bar is connected to the compensation type cutter handle. Matching of the conical limiting spigot of the expansion pin and the inner conical end face of the reamer ring is adjusted by screwing the connecting piece, fine adjustment of the diameter of the reamer ring can be achieved, the reamer ring machining tool can adapt to large-diameter blind hole machining tasks with different size requirements, and machining precision and flexibility are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metal cutting processing technical field, especially relates to a precision adjustable big diameter blind hole processing mechanism. BACKGROUND

[0002] New energy electric vehicle has become the trend of the development of automobile industry, in the increasingly mature new energy electric vehicle processing production, especially in the processing of electric drive main body box, motor casing is the core processing of new energy. The bearing seat of electric drive main body box, motor casing is all cast aluminum alloy base inlay steel sleeve type, the bearing seat hole cutting processing technical field of electric drive main body box, motor casing, bearing seat hole diameter is big (phi 62-phi 120), the rate of rotation is high, therefore the requirement processing precision (generally H7→H6 class tolerance) and behavior tolerance precision (<00.01mm) is higher and higher.

[0003] Among them, the bearing seat hole is generally blind hole processing, which brings a lot of challenges to the processing process. First, the steel chips generated in the cutting process are difficult to smoothly discharge outside the hole, and are easy to stay in the hole bottom or hole wall, not only affect the processing efficiency, but also may adversely affect the processing accuracy. Secondly, these retained steel chips are easy to wrap on the tool, that is, the so-called "knife winding" phenomenon, which will seriously affect the normal working state of the tool, cause uneven cutting force, aggravate tool wear, and may damage the bearing hole surface finish being processed.

[0004] Therefore, the above situation needs to be solved urgently. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the above insufficient, and the utility model aims at providing a precision adjustable big diameter blind hole processing mechanism, realize the bearing seat hole of big diameter can be adjusted and have high-precision processing standard, the form tolerance can reach the blind hole steel piece precision hole processing of u level (≤0.01mm).

[0006] Technical solution: A precision adjustable large diameter blind hole machining mechanism, comprising a reamer ring, a cutter bar, a compensation type cutter handle, an adjusting expansion pin, and a connecting piece; the reamer ring is sleeved on one end of the cutter bar and is connected by a first positioning stop, and a positioning pin is arranged on one end of the cutter bar; the adjusting expansion pin is provided with a third positioning stop and a conical limiting stop; the third positioning stop is in abutting positioning with one end of the cutter bar, and the conical limiting stop is in abutting connection with the inner conical end face of the reamer ring; the adjusting expansion pin is movably connected to one end of the cutter bar through the connecting piece; the other end of the cutter bar is connected to the compensation type cutter handle. By adjusting the cooperation between the conical limiting stop of the adjusting expansion pin and the inner conical end face of the reamer ring through the connecting piece, the diameter of the reamer ring can be finely adjusted; this makes the mechanism adapt to large diameter blind hole machining tasks of different size requirements, and also realizes the fine adjustment of the diameter of the reaming mechanism after diameter wear (≤0.02mm), thereby improving the machining precision and flexibility.

[0007] Further, the convex surface of the connecting piece is in abutting connection with the concave surface of the adjusting expansion pin. The cooperation between the convex surface and the concave surface can provide more stable contact and reduce the positional deviation caused by vibration or impact during the machining process.

[0008] Further, the reamer ring comprises a group of cutting teeth and a group of chip removal grooves; the cutting teeth are unevenly and symmetrically arranged on the circumference of the reamer ring, and the chip removal grooves are arranged in the axial direction between the cutting teeth. The axial through chip removal grooves arranged between the cutting teeth provide an effective discharge path for the waste generated during the cutting process, which can avoid the problems of machining surface quality or tool wear caused by waste accumulation, and avoid the tool vibration caused by the same frequency of the bearing hole machining of the steel piece.

[0009] Further, the end face of the reamer ring is provided with a recess block at a position corresponding to the chip removal groove; the end face of the recess block is flush with the adjusting expansion pin and is lower than the end face of the cutting tooth, and is used for chip storage during blind hole machining. The recess block can directly increase the space at the end face of the reamer ring, provide more storage space for the waste generated during the cutting process, and avoid the phenomenon of end face touching the bottom and steel chips winding the tool during machining.

[0010] Further, the cutting tooth is provided with at least 8 cutting teeth. The cooperation of multiple cutting teeth during machining has higher efficiency than single-tooth boring tool machining, which helps to speed up the machining speed and improve the overall production efficiency.

[0011] Further, a set of cooling holes are arranged on the end face of the tool bar close to the reamer ring and corresponding to the position of the chip groove. The cooling holes of the present application are directly located at the end of the tool bar close to the reamer ring and correspond to the position of the chip groove, so that the cooling liquid can directly reach the cutting area, effectively reducing the high temperature generated during cutting, preventing the workpiece and tool from being damaged due to overheating; and the cooling liquid sprayed into the cutting area through the cooling holes not only can reduce the temperature, but also can help to flush the cutting chips away from the machining area and smoothly discharge them into the chip groove. In this way, the cutting chips can be prevented from blocking the chip groove or remaining in the cutting area to affect the machining quality.

[0012] Further, a first flange is arranged at the end of the tool bar close to the compensation type tool holder, and the first flange is connected with a second flange on the compensation type tool holder through screws. The flange connection of the present application provides a larger contact area and stronger mechanical fixing force, ensuring the close combination between the tool bar and the compensation type tool holder and reducing loosening caused by vibration or other external forces.

[0013] Further, a set of axial adjustment screws are arranged at the connection end of the first flange and the second flange. The axial adjustment screws allow fine adjustment of the tool bar relative to the compensation type tool holder, can realize very accurate axial position adjustment during installation or maintenance, and are helpful to ensure accurate alignment of the entire machining mechanism and effectively improve the precision.

[0014] Further, a set of radial adjustment screws are arranged at the connection end of the second positioning stopper on the tool bar and the second flange.

[0015] The above technical solutions can have the following beneficial effects:

[0016] 1. The present application can realize fine adjustment of the diameter of the reamer ring by adjusting the cooperation between the tapered limiting stopper of the expansion pin and the tapered end face in the reamer ring through the screw connection. This makes the mechanism adapt to the machining task of large-diameter blind holes with different size requirements, and can also realize the diameter fine adjustment and increase (≤0.02mm) of the reaming mechanism after diameter wear, thereby improving the machining precision and flexibility.

[0017] 2. The present application is provided with axial through chip grooves between the cutting teeth, which provide an effective discharge path for the cutting chips generated during cutting, can avoid the problems of machining surface quality or tool wear caused by accumulation of cutting chips, and can avoid the vibration of the reamer caused by the same frequency during machining of the bearing hole of the steel piece.

[0018] 3. The present application provides a recess block to directly increase the space at the end face of the reamer ring, adjust the expansion pin end face to be flush with the recess block end face of the reamer ring, and be lower than the cutting teeth, so as to provide more storage space for the cutting chips generated during cutting, and avoid the phenomenon of end face touching the bottom and steel chips winding the tool during machining.

[0019] 4. The cooling hole of the present application is directly located at the end of the tool bar close to the reamer ring, and corresponds to the position of the chip flute, which makes the cooling liquid directly reach the cutting area, effectively reduces the high temperature generated in the cutting process, and prevents the workpiece and tool from being damaged due to overheating; and the cooling liquid sprayed to the cutting area through the cooling hole not only can reduce the temperature, but also can help to flush the chips from the machining area, and then smoothly discharge into the chip flute. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an exploded front view of the structure of the precision adjustable large-diameter blind hole machining mechanism.

[0021] Figure 2 It is a structure diagram of the reamer ring of the precision adjustable large-diameter blind hole machining mechanism.

[0022] Figure 3 It is a front view structure diagram of the adjusting expansion pin of the precision adjustable large-diameter blind hole machining mechanism.

[0023] Figure 4 It is a position structure diagram of the connecting piece of the precision adjustable large-diameter blind hole machining mechanism.

[0024] Figure 5 It is a position structure diagram of the cooling hole of the precision adjustable large-diameter blind hole machining mechanism.

[0025] Figure 6 It is a structure diagram of the precision adjustable large-diameter blind hole machining mechanism.

[0026] Explanation of reference signs: 1, reamer ring; 101, cutting tooth; 102, chip flute; 103, concave block; 104, first positioning stop; 105, positioning pin;

[0027] 2, tool bar; 201, first flange; 202, screw; 203, axial adjusting screw; 204, second positioning stop; 205, cooling hole;

[0028] 3, compensation type tool shank; 301, second flange; 302, radial adjusting screw;

[0029] 4, adjusting expansion pin; 401, third positioning stop; 402, conical limiting stop; 403, concave surface;

[0030] 5, connecting piece; 501, convex surface. DETAILED DESCRIPTION

[0031] The present application will be further illustrated below in combination with the drawings and specific embodiments.

[0032] Example 1

[0033] The embodiment introduces a precision adjustable large-diameter blind hole machining mechanism, please refer to Figures 1-6 As shown in the figure, it comprises a reamer ring 1, a cutter bar 2, a compensation type cutter handle 3, an adjusting expansion pin 4 and a connecting piece 5; the reamer ring 1 is sleeved on one end of the cutter bar 2, and the other end of the cutter bar 2 is connected to the compensation type cutter handle 3.

[0034] Specifically, the reamer ring 1 is limitingly connected with the cutter bar 2 through a first positioning stop 104, and a positioning pin 105 is arranged for positioning connection with one end of the cutter bar 2.

[0035] Specifically, the adjusting expansion pin 4 is provided with a third positioning stop 401 and a conical limiting stop 402; the third positioning stop 401 is abuttingly positioned with one end of the cutter bar 2, and the conical limiting stop 402 is abuttingly positioned with an inner conical end face of the reamer ring 1; the adjusting expansion pin 4 is movably connected with one end of the cutter bar 2 through the connecting piece 5.

[0036] Specifically, please refer to Figure 2 As shown in the figure, the reamer ring 1 comprises a group of cutting teeth 101 and a group of chip removal grooves 102; the cutting teeth 101 are unevenly and symmetrically arranged on the circumference of the reamer ring 1, and the chip removal grooves 102 are arranged in the axial direction between the cutting teeth 101.

[0037] Specifically, the end face of the reamer ring 1 and the corresponding position of the chip removal groove 102 are provided with a recess block 103; the end face of the recess block 103 is flush with the end face of the adjusting expansion pin 4, and is lower than the end face of the cutting tooth 101, which is used for chip removal during blind hole machining.

[0038] Specifically, the cutting tooth 101 is provided with at least 8.

[0039] Specifically, please refer to Figure 4 As shown in the figure, the convex surface 501 of the connecting piece 5 is abuttingly positioned with the concave surface 403 of the adjusting expansion pin 4.

[0040] Specifically, please refer to Figure 5 As shown in the figure, a group of cooling holes 205 are arranged on the end face of the cutter bar 2 close to the reamer ring 1 and at the corresponding position of the chip removal groove 102.

[0041] Specifically, please refer to Figure 6 As shown in the figure, a first flange 201 is arranged on one end of the cutter bar 2 close to the compensation type cutter handle 3, and the first flange 201 is connected with a second flange 301 on the compensation type cutter handle 3 through a screw 202.

[0042] Specifically, a group of axial adjustment screws 203 are arranged on the connecting end of the first flange 201 and the second flange 301.

[0043] Specifically, the second positioning stop 204 on the tool bar 2 is connected with the second flange 301 end to set a group of radial adjustment screws 302, and the whole can realize radial and axial runout accuracy compensation.

[0044] Embodiment 2

[0045] This embodiment introduces the working principle and working steps of a precision adjustable large-diameter blind hole machining mechanism, which is further introduced based on the above embodiment.

[0046] The working principle of the precision adjustable large-diameter blind hole machining mechanism: the application has a fine adjustment mechanism, an adjustment expansion pin 4 is arranged in the reamer ring 1, the tapered limiting stop 402 on the adjustment expansion pin 4 abuts against the inner tapered end face of the reamer ring 1, the position of the adjustment expansion pin 4 is adjusted by screwing the connecting piece 5, since the convex surface 501 of the connecting piece 5 abuts against the concave surface 403 of the adjustment expansion pin 4, the adjustment expansion pin 4 can be driven to move axially to the tool bar 2, and then the tapered limiting stop 402 moves to the side of the tool bar 2, so that the fine adjustment of the tool diameter can be changed, and the large-diameter blind hole machining task with different size requirements can be adapted.

[0047] Further, the axial adjustment screw 203 is arranged between the first flange 201 and the second flange 301, and the radial adjustment screw 302 is arranged at the connecting end of the second positioning stop 204 and the second flange 301, which allows fine but critical axial and radial adjustment of the tool, ensuring high-precision machining.

[0048] Further, the application has good cutting and chip removal functions, a group of cutting teeth 101 and a group of chip removal grooves 102 are arranged on the reamer ring 1, the cutting teeth 101 are arranged around the circumference of the reamer ring 1, and the workpiece is cut during rotation; the chip removal groove 102 is used to remove the waste generated during cutting, ensuring smooth cutting process and avoiding the influence of waste accumulation on machining quality.

[0049] Further, the application also has a good cooling system, a group of cooling holes 205 corresponding to the chip removal groove 102 are arranged at one end of the tool bar 2 close to the reamer ring 1, cooling liquid is sprayed to the cutting area through these cooling holes 205, which not only reduces the cutting temperature, but also assists in chip removal and protects the tool from overheating damage.

[0050] Further, the other end of the tool bar 2 is connected to the compensation type tool shank 3, which allows a certain degree of automatic compensation to overcome the precision loss problem caused by temperature changes, wear and other factors.

[0051] Further, the working steps of the precision adjustable large-diameter blind hole machining mechanism include:

[0052] Step S1, preparation: according to the processing requirements, select the appropriate reamer ring 1, and set it on the end of the tool bar 2, using the first positioning stop 104 and positioning pin 105 for limiting and positioning. Then, install the adjusting expansion pin 4 and the connecting piece 5 and preliminarily set their positions to adapt to the expected processing diameter.

[0053] Step S2, installation and calibration: connect the other end of the tool bar 2 to the compensation type tool holder 3, and fix it by screw 202 using first flange 201 and second flange 301.

[0054] Specifically, the axial adjustment screw 203 and the radial adjustment screw 302 are used for accurate axial and radial adjustment of the tool, ensuring the correct centering and positioning of the tool.

[0055] Step S3, start processing: turn on the machine tool, and start the reamer ring 1 to rotate and cut the workpiece.

[0056] At the same time, turn on the cooling system, and provide cooling liquid to the cutting area through the cooling hole 205 on the tool bar 2, to help cooling and assist in chip removal.

[0057] Step S4, monitoring and adjustment: during processing, continuously monitor the processing state, and if necessary, adjust the expansion pin 4 and other adjustment devices to fine-tune the processing parameters, to ensure the processing quality and efficiency.

[0058] Step S5, completion and cleaning: after processing is completed, turn off the machine tool, remove the finished product and clean the waste and residues in the processing area, to prepare for the next processing.

[0059] The application has the advantages of simple structure and low cost, and through reasonable arrangement of the end face structure and the chip removal structure of the reamer ring, convenient and simple radial fine adjustment is realized, high-efficiency and high-precision blind hole machining of steel bearing seat is realized, and the application has great popularization value.

[0060] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements can be made without departing from the principles of the present application, and these improvements should also be considered as the protection range of the present application.

Claims

1. A precision adjustable large diameter blind hole machining mechanism, characterized in that, The reamer ring (1), the reamer bar (2), the compensation type reamer handle (3), the adjusting expansion pin (4), the connecting piece (5); the reamer ring (1) is sleeved on one end of the reamer bar (2), is limitedly connected through the first positioning stop (104), and is positioned and connected with one end of the reamer bar (2) through the positioning pin (105); the adjusting expansion pin (4) is provided with the third positioning stop (401) and the conical limiting stop (402); the third positioning stop (401) is abutted and positioned with one end of the reamer bar (2), and the conical limiting stop (402) is abutted on the inner conical end face of the reamer ring (1); the adjusting expansion pin (4) is movably connected with one end of the reamer bar (2) through the connecting piece (5); the other end of the reamer bar (2) is connected with the compensation type reamer handle (3).

2. The mechanism for machining a precision adjustable large-diameter blind hole according to claim 1, characterized in that, The convex surface (501) of the connecting piece (5) is abutted on the concave surface (403) of the adjusting expansion pin (4).

3. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 1, characterized in that, The reamer ring (1) comprises a group of cutting teeth (101) and a group of chip removal grooves (102); the cutting teeth (101) are unevenly and symmetrically arranged on the circumference of the reamer ring (1), and the axial through chip removal grooves (102) are arranged between the cutting teeth (101).

4. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 3, characterized in that, The end face of the reamer ring (1) is provided with the recess block (103) at the position corresponding to the chip removal groove (102); the end face of the recess block (103) is flush with the end face of the adjusting expansion pin (4), and is lower than the end face of the cutting tooth (101), and is used for blind hole machining chip.

5. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 3, characterized in that, The cutting tooth (101) is provided with at least 8.

6. The precision adjustable large diameter blind hole machining mechanism according to claim 1 or 3, characterized in that, A group of cooling holes (205) are arranged on the end face of the reamer bar (2) close to the reamer ring (1) and at the position corresponding to the chip removal groove (102).

7. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 1, characterized in that, The first flange (201) is arranged on one end of the reamer bar (2) close to the compensation type reamer handle (3), and the first flange (201) and the second flange (301) on the compensation type reamer handle (3) are connected through the screw (202).

8. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 7, characterized in that, A group of axial adjusting screws (203) are arranged on the connecting end of the first flange (201) and the second flange (301).

9. The mechanism for machining a precisely adjustable large-diameter blind hole according to claim 7, characterized in that, A group of radial adjusting screws (302) are arranged on the second positioning stop (204) on the reamer bar (2) and the connecting end of the second flange (301).

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