Internal expansion type multi-edge reamer

Abstract

The utility model discloses an internal expansion type multi-edge reamer, and belongs to the technical field of reamers. The internal expansion type multi-cutting-edge reamer comprises a reamer body, blades and an inner cone. The cutter body comprises a main cutter body and an outer cone, the outer cone is connected to one end of the main cutter body, and a conical inner groove is formed in the outer cone; a plurality of blades are arranged on the peripheral surface of the outer cone; the inner cone is connected into the conical inner groove, the outer cone can expand outwards or contract inwards in the radial direction of the outer cone by rotating the inner cone, and the inner cone and the conical inner groove are in multi-point contact. According to the internal expansion type multi-blade reamer, the hole shrinkage amount of the hole diameter size of a machining hole can be matched with the change of the environment temperature of a machining workshop, so that the internal expansion type multi-blade reamer is suitable for the machining workshop without a constant-temperature condition; meanwhile, the inner cone and the conical inner groove are in multi-point contact, jumping of all the cutting edges can be kept unchanged, the machining effect of the cutting edges of all the blades on machining holes is guaranteed, balanced machining of all the blades can be facilitated, and therefore the service life of the whole internal expansion type multi-cutting-edge reamer can be prolonged.

Description

Internal expansion multi-blade reamer Technical Field

[0001] This utility model relates to the field of reamer technology, and in particular to an internal expansion type multi-blade reamer. Background Technology

[0002] Currently, the following two machining processes are commonly used for the precision machining of bearing holes in the motor housing and reducer housing of new energy vehicles: 1. Single-edge precision boring using a standard boring bar, but the feed rate of the standard boring bar is generally in the range of F50 to F150, resulting in low machining efficiency; 2. Using a guide bar boring bar, but the feed rate of the guide bar boring bar is generally in the range of F50 to F250, resulting in low machining efficiency; in addition, the guide bar part of the guide bar boring bar is prone to chip adhesion during the machining process, leading to the scrapping of the motor housing or reducer housing.

[0003] To address the above issues, a welded multi-bladed PCD reamer is employed. Specifically, this is a multi-bladed reamer that uses diamond (PCD) as the cutting material. This welded multi-bladed PCD reamer has a long service life, high feed rate, and can ensure high machining efficiency. It is also less prone to chip adhesion, which can reduce the scrap rate of motor housings or reducer housings. Furthermore, the cutting diameter of this welded multi-bladed PCD reamer is adjustable to ensure the reduction of bearing hole diameter, making it suitable for machining workshops without constant temperature conditions.

[0004] However, due to the inconsistency in diameter deformation at each cutting edge during the adjustment of the cutting edge diameter of this welded multi-blade PCD reamer, uneven runout of each cutting edge occurs.

[0005] To address the above problems, there is an urgent need for an internally expanding multi-bladed reamer. Summary of the Invention

[0006] The purpose of this invention is to propose an internally expanding multi-blade reamer that allows the hole shrinkage to adapt to changes in the ambient temperature of the machining workshop, and reduces the contact area between the inner cone and the conical inner groove, so as to ensure that the diameter deformation at each cutting edge is consistent.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Internal expansion multi-blade reamers include:

[0009] The blade body includes a main blade body and an outer cone, wherein the outer cone is connected to one end of the main blade body and a conical inner groove is formed within the outer cone;

[0010] The outer circumferential surface of the outer cone is provided with multiple blades;

[0011] The inner cone is connected to the conical inner groove. Rotating the inner cone can cause the outer cone to expand outward or contract inward along its radial direction, and there are multiple points of contact between the inner cone and the conical inner groove.

[0012] Alternatively, the taper of the inner cone gradually increases along the axial direction of the blade body and away from the main blade body.

[0013] As an optional solution, the roundness, cylindricity, concentricity, and roughness of the conical inner groove are respectively matched with the roundness, cylindricity, concentricity, and roughness of the inner cone.

[0014] As an optional solution, the inner wall surface of the conical inner groove and / or the outer peripheral surface of the inner cone are provided with multiple equally divided grooves so that there are multiple points of contact between the inner cone and the conical inner groove.

[0015] As an optional solution, the outer peripheral surface of the inner cone is provided with an external thread, and the inner wall surface of the conical inner groove is provided with an internal thread that mates with the external thread. The pitch of the external thread / internal thread is less than a preset fine thread pitch, and the tooth profile depth of the external thread / internal thread is less than a preset fine thread profile depth.

[0016] As an optional solution, the outer end face of the inner cone away from the main cutter body is provided with a marking scale, which is related to the outward expansion or inward contraction of the outer cone.

[0017] As an optional feature, the internally expanding multi-bladed reamer further includes:

[0018] An adjusting member is coaxially inserted into the inner cone and extends into the outer cone, with the outer end face of the adjusting member flush with the outer end face of the inner cone. Twisting the adjusting member can cause the inner cone to rotate relative to the outer cone.

[0019] As an optional feature, the outer end face of the adjusting member is provided with a rotating insertion hole.

[0020] As an optional solution, the main blade body has a hollow hole inside, which is connected to the conical inner groove.

[0021] As an optional solution, the main blade body and the outer cone body are integrally formed.

[0022] The beneficial effects of this utility model are as follows:

[0023] By connecting the outer cone to one end of the main cutter body, multiple blades are evenly arranged on the outer circumference of the outer cone, and the inner cone is connected to the conical inner groove of the outer cone. Rotating the inner cone changes its specific connection position within the conical inner groove. Due to the conical shape of the inner cone and the conical inner groove, the outer cone can be driven to expand or contract radially, thereby adjusting the cutting diameter of each blade. In other words, the conical fit between the inner and outer cones forms an internal expansion structure, allowing the diameter of the entire internal expansion multi-blade reamer to increase or decrease. This ensures the reduction in bore diameter of the machined hole on the workpiece, enabling the bore diameter to adapt to changes in the ambient temperature of the machining workshop, thus making it suitable for various applications. In machining workshops without constant temperature conditions; simultaneously, the contact between the inner cone and the conical inner groove is multi-point, which reduces the contact area between the inner cone and the conical inner groove compared to the surface contact in the prior art. This ensures that the deformation of the outer cone is consistent at all positions in its circumferential direction during the diameter adjustment process. This ensures that after the diameter expands or contracts, the cutting edges of each blade on the outer cone remain on the same circumferential surface, guaranteeing consistent diameter deformation at each cutting edge. Consequently, the runout of each cutting edge remains unchanged, ensuring the machining effect of each cutting edge on the machined hole and promoting balanced machining of each cutting edge, thereby improving the service life of the entire internal expansion multi-blade reamer. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the internal expansion multi-blade reamer provided by this utility model.

[0025] Figure 2 is a schematic diagram of the internal expansion multi-blade reamer (with the inner cone not connected to the conical inner groove) provided by this utility model.

[0026] Figure 3 is a schematic diagram of the structure of the inner cone provided by this utility model;

[0027] Figure 4 is a schematic diagram of the internal expansion multi-blade reamer provided by this utility model.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Cut body; 11-Main cutter body; 111-Hollow hole; 12-Outer cone; 121-Conical inner groove;

[0030] 2-blade;

[0031] 3-Inner cone; 31-Divided groove; 32-Marked graduations;

[0032] 4-Adjusting component; 41-Rotating insertion hole. Detailed Implementation

[0033] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0034] Any feature disclosed in this specification, unless specifically stated otherwise, may be replaced by other equivalent or similar features. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features. Throughout this specification, the same reference numerals indicate the same elements.

[0035] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment proposes an internally expanding multi-bladed reamer. This reamer can precisely machine holes in a workpiece and its diameter can be adjusted to ensure the reduction in hole size. This allows the hole diameter to adapt to temperature variations in the machining workshop, making it suitable for workshops without constant temperature conditions. Furthermore, this internally expanding multi-bladed reamer avoids runout issues after diameter adjustment, ensuring optimal machining results and extending the overall lifespan of the reamer. Specifically, the workpiece can be a motor housing or a reducer housing, and the machined hole can be a bearing hole. The specific types of the workpiece and the machined hole are not limited here.

[0037] Specifically, as shown in Figures 1 and 2, the internally expanding multi-bladed reamer includes a cutter body 1, cutting blades 2, and an inner cone 3. The cutter body 1 includes a main cutter body 11 and an outer cone 12. The outer cone 12 is connected to one end of the main cutter body 11, and a conical inner groove 121 is formed within the outer cone 12. Multiple cutting blades 2 are provided on the outer circumferential surface of the outer cone 12, each cutting blade 2 used to machine holes on the workpiece. The inner cone 3 is connected within the conical inner groove 121. When the inner cone 3 rotates about the axial direction of the cutter body 1, the outer cone 12 can expand outward or contract inward along its radial direction, and there are multiple points of contact between the inner cone 3 and the conical inner groove 121. The main cutter body 11 and the outer cone 12 are integrally formed to ensure the stable connection between them. The axial direction of the cutter body 1 is specifically shown by arrow C in Figures 1 and 2.

[0038] Compared to existing technologies, the internally expanding multi-blade reamer in this embodiment adjusts the cutting diameter of each blade 2 through the internally expanding structure formed by the inner cone 3 and the outer cone 12, while also changing the contact method between the inner cone 3 and the outer cone 12. By rotating the inner cone 3 axially around the cutter body 1, the specific connection position of the inner cone 3 within the conical inner groove 121 can be changed. Furthermore, due to the conical design of the inner cone 3 and the conical inner groove 121, the outer cone 12 can be driven to expand or contract radially, thereby adjusting the cutting diameter of each blade 2. In other words, the internally expanding structure formed by the conical fit between the inner cone 3 and the outer cone 12 allows the diameter of the entire internally expanding multi-blade reamer to increase or decrease, thus ensuring the reduction in hole size on the workpiece and ensuring that the hole diameter can be adapted to different dimensions. The change in ambient temperature in the machining workshop makes it suitable for machining workshops without constant temperature conditions. At the same time, the multi-point contact between the inner cone 3 and the conical inner groove 121, compared with the surface contact in the prior art, can reduce the contact area between the inner cone 3 and the conical inner groove 121. This ensures that the deformation of the outer cone 12 is consistent at all positions in its circumferential direction during the diameter adjustment process. This ensures that after the diameter is expanded or contracted, the cutting edges of each blade 2 on the outer cone 12 are still located on the same circumferential surface, ensuring that the diameter deformation at each cutting edge is consistent. This also keeps the runout of each cutting edge unchanged, ensuring the machining effect of each cutting edge 2 on the machined hole, and promoting the balanced machining of each cutting edge 2, thereby improving the service life of the entire internal expansion multi-blade reamer.

[0039] It is worth noting that the blade diameter involved in this embodiment specifically refers to the diameter of the circumferential surface where the blades of each blade 2 on the outer cone 12 are located.

[0040] Furthermore, as shown in Figures 1 and 2, along the axial direction of the cutter body 1 and away from the main cutter body 11, the taper of the inner cone 3 gradually increases; correspondingly, the taper of the conical inner groove 121 of the outer cone 12 matches the taper of the inner cone 3. Here, the specific taper of the inner cone 3 is not limited, and needs to be determined according to the actual cutting edge diameter adjustment requirements of the internal expansion multi-blade reamer.

[0041] Specifically, the roundness, cylindricity, concentricity, and roughness of the conical inner groove 121 are matched with the roundness, cylindricity, concentricity, and roughness of the inner cone 3, respectively. In particular, the conical inner groove 121 is ground using an ultra-fine grinding wheel to ensure high accuracy in the form and position tolerances of the roundness, cylindricity, concentricity, and roughness of the conical inner groove 121. The high-precision inner cone 3, which is matched with the conical inner groove 121, is also ground using an ultra-fine grinding wheel to ensure high accuracy in the form and position tolerances of the roundness, cylindricity, concentricity, and roughness of the inner cone 3. Thus, a high degree of matching between the conical inner groove 121 and the inner cone 3 can be ensured.

[0042] Specifically, the ultra-fine grinding wheel is made of special steel. Special steel refers to steel with special properties made by adding alloying elements and using special processes with iron as the base material. It is also known as special steel or alloy steel. Special steel has special physical, chemical or mechanical properties. Furthermore, the shape and size of the ultra-fine grinding wheel match the shape and size of the inner cone 3 to be formed, so as to facilitate the processing of the required inner cone 3 and conical inner groove 121 by the ultra-fine grinding wheel.

[0043] Furthermore, as shown in Figures 2 and 3, multiple equally divided grooves 31 are provided on the inner wall surface of the conical inner groove 121 and / or the outer peripheral surface of the inner cone 3, so that the inner cone 3 and the conical inner groove 121 can form the aforementioned multi-point contact through the various equally divided grooves 31; that is, the inner wall surface of the conical inner groove 121 and the outer peripheral surface of the inner cone 3 do not contact at the locations where equally divided grooves 31 are provided, and the contact surfaces between the inner wall surface of the conical inner groove 121 and the outer peripheral surface of the inner cone 3 are the locations where equally divided grooves 31 are not provided, thereby ensuring that the inner cone 3 and the conical inner groove 121 no longer form surface contact, but form multi-point contact.

[0044] In this embodiment, as shown in Figures 2 and 3, multiple equally divided grooves 31 are provided on the outer peripheral surface of the inner cone 3. Here, the specific shape and size of the equally divided grooves 31 are not actually limited, as long as it can ensure that the inner cone 3 and the conical inner groove 121 can be contacted at multiple points through the equally divided grooves 31, so as to ensure the consistency and stability of the change in the diameter of the blade after adjustment.

[0045] Furthermore, an external thread is provided on the outer circumferential surface of the inner cone 3, and an internal thread that mates with the external thread is provided on the inner wall surface of the conical inner groove 121. The pitch of the external thread / internal thread is less than the preset fine thread pitch, and the tooth profile depth of the external thread / internal thread is less than the preset fine thread profile depth. That is, the inner cone 3 and the outer cone 12 are specifically connected by a fine thread, so that the inner cone 3 can be slightly turned to achieve a micro-adjustment of the cutting edge diameter, thereby making the cutting edge diameter of the entire internal expansion multi-blade reamer meet the micro-adjustment requirements.

[0046] It is worth noting that the preset fine thread pitch and preset fine thread profile depth mentioned above are sufficient to meet the requirements of fine thread connection. Here, the specific values ​​of the preset fine thread pitch and preset fine thread profile depth are not limited.

[0047] Furthermore, as shown in Figures 1 and 2, a marking scale 32 is provided on the outer end face of the inner cone 3 away from the main blade body 11. The accuracy of the marking scale 32 is 1µm. The marking scale 32 is related to the outward expansion or inward contraction of the outer cone 12. That is, if the outer cone 12 needs to expand or contract radially by a value A, the inner cone 3 needs to be rotated by an angle B according to the specific value A and the marking scale 32. This ensures that the outer cone 12 expands or contracts by the value A after the inner cone 3 rotates by an angle B, allowing for direct and accurate adjustment of the blade diameter according to the marking scale 32. This ensures the intuitiveness and accuracy of the blade diameter adjustment of the entire internal expansion multi-blade reamer. The values ​​A and B here need to be determined according to the actual blade diameter adjustment requirements and are not specifically limited.

[0048] It is worth noting that the end of the main cutter body 11 without the outer cone 12 is connected to the machine tool. That is, when adjusting the cutting edge diameter by turning the turning tool, it is not necessary to first remove the main cutter body 11 from the machine tool and move it to the tool setting instrument to check the size. It is only necessary to make precise rotation adjustment according to the scale 32 associated with the outward expansion or inward contraction of the outer cone 12. Thus, the adjustment can be made directly on the machine tool, making the adjustment of the cutting edge diameter simple and convenient, saving time and effort.

[0049] Specifically, as shown in Figures 1 and 2, the internal expansion multi-blade reamer also includes an adjusting member 4. The adjusting member 4 is coaxially inserted into the inner cone 3 and extends into the outer cone 12, and the outer end face of the adjusting member 4 is flush with the outer end face of the inner cone 3, so as to facilitate the rotation of the inner cone 3 according to the marked scale 32, ensuring that the adjusting member 4 does not obstruct or interfere with the marked scale 32. Rotating the adjusting member 4 can drive the inner cone 3 to rotate relative to the outer cone 12. That is, the inner cone 3 can be rotated synchronously by directly rotating the adjusting member 4, which facilitates the adjustment of the inner cone 3, making the adjustment of the cutting edge diameter simple and convenient, saving time and effort. The adjusting member 4 can be a long block structure. Here, the specific structure of the adjusting member 4 is not limited, as long as the synchronous rotation of the inner cone 3 can be achieved by rotating the adjusting member 4.

[0050] Furthermore, as shown in Figures 1 and 2, a rotating insertion hole 41 is provided on the outer end face of the adjusting member 4, so that a matching screwing tool can be easily inserted into the rotating insertion hole 41. This allows the adjusting member 4 and the inner cone 3 to rotate by directly screwing the tool, which further facilitates the rotation adjustment of the inner cone 3, making the adjustment of the blade diameter simpler, more convenient, and saving time and effort.

[0051] Specifically, the aforementioned rotating insertion hole 41 can be an internal hexagon socket, and correspondingly, the tightening tool can be an internal hexagon wrench. Here, the specific types of the rotating insertion hole 41 and the tightening tool are not limited, as long as the tightening tool can be inserted into the rotating insertion hole 41 for tightening.

[0052] Furthermore, as shown in Figure 4, the main cutter body 11 has a hollow hole 111 inside, and the hollow hole 111 is connected to the conical inner groove 121. On the one hand, this can reduce the weight of the entire cutter body 1, making the cutter body 1 more suitable for various types of machine tools. On the other hand, the hollow hole 111 can absorb the vibration generated during the machining of the workpiece, achieving a better anti-vibration effect, thereby ensuring the machining effect of the machined hole. In addition, the hollow hole 111 facilitates the introduction of coolant to achieve cooling and heat dissipation of the entire internal expansion multi-blade reamer during the machining process. At the same time, the hollow hole 111 provides machining space to facilitate the machining of the aforementioned external and internal threads, making the machining of external and internal threads simple and convenient.

[0053] In this embodiment, the internal expansion multi-blade reamer forms an internal expansion structure through the conical fit between the inner cone 3 and the outer cone 12, thereby increasing or decreasing the diameter of the entire internal expansion multi-blade reamer. This ensures the reduction of the hole size in the workpiece, making it suitable for machining workshops without constant temperature conditions. Furthermore, multiple equally spaced grooves 31 on the inner cone 3 enable multi-point contact between the inner cone 3 and the conical inner groove 121, ensuring the consistency and stability of the change in the diameter of the cutting edge after adjustment.

[0054] In this embodiment, the internal expansion multi-blade reamer uses a fine-threaded connection between the inner cone 3 and the outer cone 12, allowing for slight adjustment of the cutting edge diameter by slightly turning the inner cone 3. Furthermore, a marking scale 32 is provided on the inner cone 3, which is associated with the outward expansion or inward contraction of the outer cone 12. This allows for direct and accurate adjustment of the cutting edge diameter based on the marking scale 32, without the need to first remove the main cutter body 11 from the machine tool and move it to a tool setting device for dimensional inspection.

[0055] In this embodiment, the internal expansion multi-blade reamer is formed with a high-precision conical inner groove 121 and inner cone 3 by grinding with an ultra-fine grinding wheel. This ensures that the roundness, cylindricity, concentricity and roughness form and position tolerances of the conical inner groove 121 and inner cone 3 are high, thereby ensuring a high degree of matching between the conical inner groove 121 and inner cone 3.

[0056] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. An internally expanding multi-bladed reamer, characterized in that, include: The blade body (1) includes a main blade body (11) and an outer cone (12), the outer cone (12) being connected to one end of the main blade body (11), and a conical inner groove (121) being formed inside the outer cone (12); blades (2), a plurality of blades (2) being provided on the outer circumferential surface of the outer cone (12); an inner cone (3), connected to the conical inner groove (121), rotating the inner cone (3) can cause the outer cone (12) to expand outward or contract inward along its radial direction, and the inner cone (3) and the conical inner groove (121) are in multi-point contact.

2. The internally expanding multi-bladed reamer as described in claim 1, characterized in that, Along the axial direction of the blade body (1) and away from the main blade body (11), the taper of the inner cone (3) gradually increases.

3. The internally expanding multi-bladed reamer as described in claim 1, characterized in that, The roundness, cylindricity, concentricity and roughness of the conical inner groove (121) are matched with the roundness, cylindricity, concentricity and roughness of the inner cone (3), respectively.

4. The internally expanding multi-bladed reamer as described in claim 1, characterized in that, The inner wall surface of the conical inner groove (121) and / or the outer peripheral surface of the inner cone (3) are provided with multiple equally divided grooves (31) so that the inner cone (3) and the conical inner groove (121) are in multi-point contact.

5. The internal expansion multi-blade reamer as described in any one of claims 1-4, characterized in that, The outer circumferential surface of the inner cone (3) is provided with an external thread, and the inner wall surface of the conical inner groove (121) is provided with an internal thread that mates with the external thread. The pitch of the external thread / the internal thread is less than the preset fine thread pitch, and the tooth profile depth of the external thread / the internal thread is less than the preset fine thread profile depth.

6. The internal expansion multi-blade reamer as described in any one of claims 1-4, characterized in that, The inner cone (3) has a marking scale (32) on its outer end face away from the main blade body (11), and the marking scale (32) is related to the outward expansion or inward contraction of the outer cone (12).

7. The internally expanding multi-bladed reamer as described in claim 6, characterized in that, The internal expansion multi-blade reamer also includes an adjusting member (4), which is coaxially inserted into the inner cone (3) and extends into the outer cone (12). The outer end face of the adjusting member (4) is flush with the outer end face of the inner cone (3). Twisting the adjusting member (4) can drive the inner cone (3) to rotate relative to the outer cone (12).

8. The internally expanding multi-bladed reamer as described in claim 7, characterized in that, The outer end face of the adjusting member (4) is provided with a rotating insertion hole (41).

9. The internal expansion multi-blade reamer as described in any one of claims 1-4, characterized in that, The main blade body (11) has a hollow hole (111) inside, which is connected to the conical inner groove (121).

10. The internal expansion multi-blade reamer as described in any one of claims 1-4, characterized in that, The main blade (11) and the outer cone (12) are integrally formed.

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