Inner-cooling forming stepped reamer

Abstract

The utility model provides an inner-cooling forming stepped reamer which comprises a reamer handle and a cutting edge, and the reamer handle and the cutting edge are coaxially and integrally arranged. Spiral cutting edges are arranged on the periphery of the cutting edge, the spiral cutting edges spirally extend along the axis of the cutting edge, and chip grooves are formed between the adjacent spiral cutting edges. The blade comprises a first blade part, a second blade part and a third blade part, the first blade part is arranged at the end, away from the cutter handle, of the blade, the first blade part and the second blade part are adjacently arranged, the second blade part and the third blade part are adjacently arranged, the diameter of the first blade part is smaller than that of the second blade part to form a burr pressing part, and the diameter of the second blade part is smaller than that of the third blade part to form a step. The first blade axial section and the blade axis form an included angle. According to the three-step through hole reaming and burr pressing device, reaming and burr pressing operation of a three-step through hole can be completed at the same time, subsequent manual burr removal of workers is not needed, production efficiency is improved, production cost is reduced, and the possibility of product damage caused by manual burr removal is avoided.

Description

Technical Field

[0001] The utility model relates to a reamer, in particular to an internally cold-formed step reamer. Background Art

[0002] A reamer is a cutting tool used for hole processing. It can remove burrs from the hole, improve the finish of the hole, accurately expand or correct the hole diameter, and even correct the axis of the hole to a certain extent. Based on the characteristics of the reamer, the reamer is widely used in large-scale hole processing to improve processing efficiency and ensure the dimensional accuracy of the hole.

[0003] In the process of machining stepped holes, the step reamer can process "steps" of different diameters at the same time, greatly improving the machining efficiency. The step reamer is even designed to be internally cooled, so that the coolant is directly delivered to the cutting area to remove the heat generated during the cutting process, improve the machining quality, and maintain dimensional accuracy. In the process of machining multi-step through holes, the through holes do not need to be reamed, but burrs are easily generated at the connection between the through holes and the reamed holes, which need to be manually removed, reducing production efficiency and increasing production costs. In addition, manual burr removal can easily damage the hole wall, reduce product quality, and even produce scrap.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above-mentioned shortcomings, the utility model provides an internal cold-forming step reamer, which can simultaneously remove burrs at the connection between the through hole and the step hole when reaming the three-level step hole, thereby improving production efficiency, reducing production costs, and avoiding the possibility of product damage caused by manual burr removal.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides an internal cold forming step reamer, including a shank and a blade, and the shank and the blade are coaxially arranged as a whole. A spiral cutting edge is arranged around the blade, and the spiral cutting edge extends spirally along the axis of the blade, and a chip groove is arranged between adjacent spiral cutting edges. The blade includes a first blade portion, a second blade portion, and a third blade portion. The first blade portion is arranged at the end of the blade away from the shank, the first blade portion and the second blade portion are arranged adjacent to each other, the second blade portion and the third blade portion are arranged adjacent to each other, the diameter of the first blade portion is smaller than the diameter of the second blade portion to form a burr pressing portion, the diameter of the second blade portion is smaller than the diameter of the third blade portion to form a step, and the axial section of the first blade portion and the axis of the blade form an angle. The utility model is applied to a three-step through hole, and the three-step through hole includes three holes of different diameters, namely a first step hole, a second step hole, and a through hole, and the three holes are arranged from large to small according to the first step hole, the second step hole, and the through hole. The smallest hole in the three-step through holes is a through hole, and the through hole does not need to be reamed. In the reaming process of the utility model, the second blade and the third blade perform reaming processing on the first step hole and the second step hole. However, after the reaming processing, the connecting position of the second step hole and the through hole is easily squeezed to produce burrs, and the above-mentioned burr pressing part can remove the burrs, so that the reaming and burr pressing operations can be completed in one operation. The utility model can simultaneously complete the reaming and burr pressing operations of the step hole for the three-step through hole, without the need for subsequent workers to manually remove the burrs, thereby improving production efficiency, reducing production costs, and avoiding the possibility of product damage caused by manual burr removal.

[0007] Furthermore, in the above-mentioned internal cold forming step reamer, a reduced diameter portion is provided at the connection between the shank and the blade, and the diameter of the reduced diameter portion is smaller than the diameter of the shank. The diameter of a part of the shank is reduced, and the reduced diameter portion can reduce the weight of the tool, improve the dynamic balance during rotation, reduce vibration, and maintain stable dynamic characteristics. The reduced diameter portion forms an avoidance to prevent the shank from being squeezed by the hole wall, thereby affecting the reaming accuracy. The reduced diameter portion has a smaller diameter, so that the stress is concentrated in the reduced diameter portion during the processing, which promotes the uniform distribution of stress along the shank and improves the toughness of the reamer.

[0008] Furthermore, in the above-mentioned internal cold forming step reamer, a chamfer is provided at the connection between the burr pressing part and the second blade part. The chamfer can improve the strength of the connection between the burr pressing part and the second blade part, prevent the residual material from damaging the internal cold forming step reamer, and improve the service life of the internal cold forming step reamer.

[0009] Furthermore, in the above-mentioned internal cold forming step reamer, the step is provided with an empty blade portion, which is provided at the connection between the step and the second blade portion, the diameter of the empty blade portion is smaller than the diameter of the second blade portion, and the empty blade portion and the step are transitionally arranged with an arc portion. The empty blade portion avoids the arc portion provided in the three-step through hole to avoid overcutting.

[0010] Furthermore, in the above-mentioned internal cold forming step reamer, an oblique transition portion is provided between the arc portion and the hollow blade portion, and the axial cross section of the oblique transition portion and the axial cross section of the hollow blade portion form an angle. Providing a transition portion between the arc portion and the hollow blade portion can improve the strength of the reamer and avoid damage to the tool caused by sudden excessive force during the reaming process.

[0011] Furthermore, in the above-mentioned internal cold forming step reamer, the angle between the first blade section and the blade axis is 10 degrees. For the three-step through hole, the first blade axis is set at a conical angle, which can avoid the angle between the first blade section and the blade axis being too small to cause overcutting of the connection between the second step hole and the through hole, and at the same time avoid the angle being too large to play the role of pressing burrs.

[0012] Furthermore, in the above-mentioned internally cold-formed stepped reamer, a cooling channel is provided at the axis of the shank, and the cooling channel runs through the shank and the blade along the axis of the shank. During the reaming process, the coolant is sent into the three-step through hole through the cooling channel to cool the cutting area. The coolant takes away the heat of the tool, reduces the tool temperature, improves the processing quality, and maintains the dimensional accuracy.

[0013] Furthermore, in the above-mentioned internal cold forming step reamer, the step axis section and the blade axis form an angle.

[0014] Furthermore, in the above-mentioned internal cold forming step reamer, the reduced diameter portion and the third cutting edge portion are transitionally arranged through a first transition portion, and the reduced diameter portion and the shank are transitionally arranged through a second transition portion. The first transition portion and the second transition portion are arranged to make the diameter change smoother, reduce cross-sectional mutations, help disperse stress, and reduce stress concentration.

[0015] Furthermore, in the above-mentioned internal cold forming step reamer, the axial cross section of the oblique transition portion and the axial cross section of the hollow blade portion form an angle of 3 degrees to 5 degrees.

[0016] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the internal cold-formed step reamer of the utility model can simultaneously perform reaming processing on two step holes during the reaming process, and can perform deburring processing on burrs at the through holes, so that the reaming and burr removal operations can be completed in one operation, and there is no need for subsequent workers to manually remove burrs, thereby improving production efficiency, reducing production costs, and avoiding the possibility of product damage caused by manual burr removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of an internally cold-forming step reamer of the utility model;

[0018] Figure 2 is a cross-sectional view of the three-step through hole;

[0019] Figure 3 for Figure 1 A partial enlarged view of

[0020] Figure 4 is a schematic diagram of the blade;

[0021] Figure 5 Schematic diagram of the empty blade portion.

[0022] In the figure: 1, tool handle, 2, blade, 20, spiral cutting edge, 21, first blade portion, 211, burr pressing portion, 22, second blade portion, 221, chamfer, 23, third blade portion, 231, step, 232, empty blade portion, 233, arc portion, 234, oblique transition portion, 24, reduced diameter portion, 241, first transition portion, 242, second transition portion, 25, chip groove, 3, cooling channel, 4, three-step through hole, 41, first step hole, 42, second step hole, 43, through hole. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1-3The internal cold forming step reamer shown comprises a shank 1 and a blade 2, the shank 1 and the blade 2 are coaxially arranged as a whole, a reduced diameter portion 24 is provided at the connection between the shank 1 and the blade 2, and the diameter of the reduced diameter portion 24 is smaller than the diameter of the shank 1. The reduced diameter portion 24 and the third blade portion 23 are transitionally arranged through a first transition portion 241, and the reduced diameter portion 24 and the shank 1 are transitionally arranged through a second transition portion 242. The first transition portion 241 and the second transition portion 242 are arranged to make the diameter change smoother. A spiral cutting edge 20 is provided around the blade 2, and the spiral cutting edge 20 extends spirally along the axis of the blade 2, and a chip removal groove 25 is provided between adjacent spiral cutting edges 20. The blade 2 includes a first blade portion 21, a second blade portion 22, and a third blade portion 23. The first blade portion 21 is arranged at the end of the blade 2 away from the handle 1. The first blade portion 21 and the second blade portion 22 are arranged adjacent to each other, and the second blade portion 22 and the third blade portion 23 are arranged adjacent to each other. The diameter of the first blade portion 21 is smaller than the diameter of the second blade portion 22 to form a burr pressing portion 211. A chamfer 221 is provided at the connection between the burr pressing portion 211 and the second blade portion 22. The diameter of the second blade portion 22 is smaller than the diameter of the third blade portion 23 to form a step 231. The axial section of the first blade portion 21 forms an angle with the axis of the blade 2. A cooling channel 3 is provided at the axis of the handle 1, and the cooling channel 3 runs through the handle 1 and the blade 2 along the axis of the handle 1. During the reaming process, the coolant is sent into the three-step through hole 4 through the cooling channel to cool the cutting area. The utility model is applied to a three-step through hole 4, which includes three holes of different diameters, namely a first step hole 41, a second step hole 42, and a through hole 43, and the three holes are arranged from large to small according to the first step hole 41, the second step hole 42, and the through hole 43. The smallest hole in the three-step through hole 4 is the through hole 43, and the through hole 43 does not need to be reamed. In the utility model, during the reaming process, the second blade 22 and the third blade 23 perform reaming processing on the first step hole 41 and the second step hole 42. However, after the reaming processing, the connecting position of the second step hole 42 and the through hole 43 is easily squeezed to produce burrs, and the above-mentioned burr pressing part 211 can remove the burrs, and the reaming and burr pressing operations can be completed in one operation.

[0025] like Figure 4-5 The step 231 of the internal cold forming step reamer shown in the figure has an empty knife portion 232, which is arranged at the connection between the step 231 and the second blade portion 22, and the diameter of the empty knife portion 232 is smaller than the diameter of the second blade portion 22, and the empty knife portion 232 and the step 231 are transitionally arranged with an arc portion 233. The axial section of the step 231 and the axis of the blade 2 form an angle. An oblique transition portion 234 is arranged between the arc portion 233 and the empty knife portion 232, and the axial section of the oblique transition portion 234 and the axial section of the empty knife portion 232 form an angle. The axial section of the first blade portion 21 and the axis of the blade 2 are 10 degrees. For the three-step through hole 4, the axis of the first blade portion 21 is arranged at a cone angle. The axial section of the oblique transition portion 234 and the axial section of the empty knife portion 232 form an angle of 3 degrees to 5 degrees.

[0026] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model in turn. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An internal cold forming step reamer, characterized in that: The invention comprises a tool handle (1) and a blade (2), wherein the tool handle (1) and the blade (2) are coaxially arranged as a whole; a spiral cutting edge (20) is arranged around the blade (2), wherein the spiral cutting edge (20) spirally extends along the axis of the blade (2), and a chip removal groove (25) is arranged between adjacent spiral cutting edges (20); the blade (2) comprises a first blade portion (21), a second blade portion (22), and a third blade portion (23); the first blade portion (21) is arranged at an end of the blade (2) away from the tool handle (1), the first blade portion (21) and the second blade portion (22) are arranged adjacent to each other, the second blade portion (22) and the third blade portion (23) are arranged adjacent to each other, the diameter of the first blade portion (21) is smaller than the diameter of the second blade portion (22) to form a burr pressing portion (211), the diameter of the second blade portion (22) is smaller than the diameter of the third blade portion (23) to form a step (231), and an axial section of the first blade portion (21) and the axis of the blade (2) form an angle.

2. The internal cold forming step reamer according to claim 1, characterized in that: A reduced diameter portion (24) is provided at the connection between the knife handle (1) and the blade (2), and the diameter of the reduced diameter portion (24) is smaller than the diameter of the knife handle (1).

3. The internal cold forming step reamer according to claim 1, characterized in that: A chamfer (221) is provided at the connection between the burr pressing portion (211) and the second blade portion (22).

4. The internal cold forming step reamer according to claim 1, characterized in that: The step (231) is provided with an empty blade portion (232), the empty blade portion (232) being arranged at the connection between the step (231) and the second blade portion (22), the diameter of the empty blade portion (232) being smaller than the diameter of the second blade portion (22), and the empty blade portion (232) and the step (231) being arranged in transition with an arc portion (233).

5. The internal cold forming step reamer according to claim 4, characterized in that: An oblique line transition portion (234) is provided between the arc portion (233) and the empty knife portion (232), and an axial cross section of the oblique line transition portion (234) and an axial cross section of the empty knife portion (232) form an included angle.

6. The internal cold forming step reamer according to claim 1, characterized in that: The angle between the axial section of the first cutting edge (21) and the axis of the cutting edge (2) is 10 degrees.

7. The internal cold forming step reamer according to claim 1, characterized in that: A cooling channel (3) is provided at the axis of the tool handle (1), and the cooling channel (3) runs through the tool handle (1) and the blade (2) along the axis of the tool handle (1).

8. The internal cold forming step reamer according to claim 1, characterized in that: An axial cross section of the step (231) and the axis of the blade (2) form an angle.

9. The internal cold forming step reamer according to claim 2, characterized in that: The reduced diameter portion (24) and the third blade portion (23) are transitionally arranged via a first transition portion (241), and the reduced diameter portion (24) and the shank (1) are transitionally arranged via a second transition portion (242).

10. The internal cold forming step reamer according to claim 5, characterized in that: The axial cross section of the oblique transition portion (234) and the axial cross section of the hollow blade portion (232) form an angle of 3 degrees to 5 degrees.

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