Indexable blade type reamer

Abstract

The utility model discloses an indexable blade type reamer. The indexable blade type reamer comprises a reamer rod, a blade and a screw, the blade is connected to the outer edge of the end face of the reamer rod through a screw, at least three cutting parts are arranged on the blade, transposition switching can be achieved, and the service life of the reamer is prolonged. The end face of the reamer rod is provided with a boss, a limiting pin and a limiting hole, and the blade is precisely limited in the circumferential direction and resists torque. A screw through hole, a counter bore and a stress acting surface are arranged in the center of the blade and matched with a threaded hole eccentrically formed in the reamer rod, and clamping force is increased. The radial side face of the reamer rod is provided with the chip flutes and the cooling water holes with unequal angles, the chip removal efficiency is improved, and the temperature of the cutter and the workpiece is reduced. An external connection mechanism is arranged at one end of the reamer rod away from the blade and connected with a machine tool spindle. The reamer has the advantages of long service life, high machining precision, good chip removal and cooling effects and the like.

Description

Technical Field

[0001] This utility model relates to the field of machining tools, specifically to an indexable insert reamer. Background Technology

[0002] In the field of machining, especially in precision hole machining, reamers play a crucial role as a commonly used cutting tool. Traditional reamer designs often use integral inserts. While this design is simple in structure, it has some significant limitations in the machining process. For example, once the integral insert wears out, the entire reamer needs to be replaced, which not only increases machining costs but also reduces machining efficiency. Boring tools, on the other hand, allow for diameter adjustment within a certain range, and only the insert needs to be replaced after wear. Although this reduces operating costs, it is a single-edge cutting tool, resulting in lower machining efficiency and a shorter tool life compared to reamers. Each insert replacement requires readjustment of the diameter, which can easily lead to part scrap.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: To overcome the above shortcomings, the purpose of this utility model is to provide an indexable insert reamer, in which one cutting part is positioned in the working position by using an indexable insert. When this cutting part wears out, the insert can be rotated at a certain angle to switch to another cutting part in the working position to continue reaming. This allows for full utilization of multiple cutting parts of the insert, improving tool life and machining efficiency.

[0005] Technical Solution: This utility model provides an indexable insert reamer, including a reamer shank, at least one set of inserts, and screws. The reamer shank has an end face, and an insert is provided on the outer edge of the end face. The insert is connected to the reamer shank by screws, and the insert has at least three cutting sections. By indexing the insert, one of the cutting sections is placed in the working position. When one cutting section wears out, it can be switched to another cutting section for continued use, greatly extending the overall service life of the tool, reducing the cost of frequent tool replacements, and allowing for individual insert replacement without replacing the entire reamer shank, thus reducing operating costs.

[0006] Furthermore, in this application, an indexable insert reamer has a boss, a limiting pin, and a limiting hole on its end face. The boss is located in the middle of the end face, and the limiting pin is fixed in the limiting hole by an interference fit. The insert is limited between the boss and the limiting pin. The boss in the middle of the end face and the limiting pin on the outer edge cooperate to stably limit the insert in a specific position, ensuring that the insert will not deviate during machining, thereby improving machining accuracy. The limiting pin is fixed in the limiting hole by an interference fit, ensuring a firm and reliable connection. During the high-speed rotation and cutting process of the reamer, the limiting pin will not easily loosen or fall off, ensuring a stable limiting effect on the insert. The firm limiting pin can better cooperate with the boss to accurately limit the circumferential direction of the insert and resist a certain torque.

[0007] Furthermore, in this application, an indexable blade reamer has a screw through hole and a screw countersunk hole at the center of the blade. The diameter of the screw countersunk hole is larger than the diameter of the screw through hole. The screw countersunk hole is located on the end face away from the screw through hole. A force-bearing surface is provided at the junction of the screw through hole and the screw countersunk hole. A threaded hole corresponding to the screw is provided on the end face. The center of the threaded hole and the center of the screw through hole are eccentrically set.

[0008] When the screw is screwed into the reamer shank, the screw generates a tightening force that secures the cutting tool to the reamer shank. The screw head acts on the force-bearing surface, and the eccentric design of the screw during tightening creates a lateral pressure on the cutting tool. This lateral pressure, combined with the vertical pressure, increases the clamping force between the cutting tool and the reamer shank, making the cutting tool more stable and less prone to loosening during machining.

[0009] Furthermore, this application discloses an indexable insert reamer, wherein the insert has three cutting sections: a first cutting section, a second cutting section, and a third cutting section. Each cutting section is arranged at 120-degree intervals around the center of the insert, forming a rotationally symmetrical structure. A first side surface is formed between the first and second cutting sections, and a second side surface is formed between the second and third cutting sections. The first side surface abuts against the side of a boss, and the second side surface abuts against a limiting pin. Only one cutting section is used during operation. During cutting, the cutting force is transmitted to the insert through the cutting section. The boss and the limiting pin abut against the two sides of the insert, effectively distributing the cutting force onto the reamer shank, reducing the stress on the insert, and extending the insert's service life.

[0010] Furthermore, in this application, an indexable insert reamer has multiple chip grooves on its radial side with unequal angles. The unequal angles of the chip grooves allow chips to exit through different paths at different locations, preventing chip accumulation in the same spot, thereby improving chip removal efficiency, reducing chip interference with the machining process, and lowering the risk of tool damage and decreased machining quality due to chip blockage.

[0011] Furthermore, in one indexable insert reamer of this application, the chip groove is provided with cooling water holes. During the reaming process, a large amount of heat is generated, causing the tool and workpiece temperatures to rise. The cooling water holes can spray coolant to reduce the temperature of the tool and workpiece, preventing tool overheating and wear and workpiece deformation.

[0012] Furthermore, in one of the indexable blade reamers of this application, the screw includes a screw head and a screw shank, and the screw head is provided with a quincunx-shaped groove.

[0013] Furthermore, in one indexable blade reamer of this application, the end of the reamer bar away from the blade is provided with an external connection mechanism, which is connected to the machine tool spindle.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0015] 1. The indexable insert reamer of this utility model uses an indexable insert to keep one of the cutting parts in the working position. When the cutting part wears out, it can be switched to another cutting part for continued use, which greatly extends the overall service life of the tool, reduces the cost of frequent tool replacement, and allows the insert to be replaced separately without replacing the entire reamer bar, thus reducing the cost of use.

[0016] 2. The indexable blade reamer of this utility model has a limiting pin fixed in the limiting hole by interference fit, which is firm and reliable. It will not easily loosen or fall off during the high-speed rotation and cutting process of the reamer. It can better cooperate with the boss to accurately limit the circumferential direction of the blade and resist a certain torque.

[0017] The indexable blade reamer described in this utility model utilizes the eccentric setting of the screw to generate lateral pressure on the blade during tightening. This pressure, combined with the vertical pressure, increases the clamping force between the blade and the reamer shank, making the blade more stable and less prone to loosening during machining. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exploded structure of an indexable blade type reamer according to the present invention;

[0019] Figure 2This is a schematic diagram of the reamer bar structure of an indexable blade type reamer according to this utility model;

[0020] Figure 3 This is a schematic diagram of the eccentric setting of the indexable blade type reamer blade according to the present invention;

[0021] Figure 4 This is a schematic diagram of the cross-section of a retractable blade type reamer according to the present invention;

[0022] Figure 5 This is a schematic diagram of an indexable blade type reamer screw according to the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of an indexable blade type reamer blade according to the present invention.

[0024] Explanation of reference numerals in the accompanying drawings: 1-Reamer bar, 11-End face, 12-Boss, 13-Limit pin, 14-Limit hole, 15-Chip groove, 16-Cooling water hole, 17-Threaded hole, 18-External connection mechanism, 2-Insert tool, 21-Screw through hole, 22-Screw countersunk hole, 23-Force-bearing surface, 24-First cutting part, 241-First side surface, 25-Second cutting part, 251-Second side surface, 26-Third cutting part, 3-Screw, 31-Screw head, 311-Plum blossom groove, 32-Screw rod. Detailed Implementation

[0025] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figure 1 , 2 As shown in Figure 6, a type of indexable insert reamer includes a reamer shank 1, three sets of six inserts 2, and six screws 3. The reamer shank 1 has an end face 11 at its end, and inserts 2 are located on the outer edge of the end face 11. The inserts 2 are connected to the reamer shank 1 by screws 3. Each insert 2 has three cutting sections. By indexing the inserts 2, one of these cutting sections can be positioned in a working position. Different cutting sections can be switched to different working positions using the indexable inserts. When one cutting section wears out, it can be switched to another cutting section for continued use, greatly extending the overall service life of the tool, reducing the cost of frequent tool replacements, and allowing for individual replacement of inserts 2 without replacing the entire reamer shank 1, further reducing operating costs.

[0028] In this embodiment, as Figure 1As shown, the end face 11 is provided with a boss 12, a limiting pin 13, and a limiting hole 14. The boss 12 is located in the middle of the end face 11, and the limiting pin 13 is fixed in the limiting hole 14 by an interference fit. The cutting tool 2 is limited between the boss 12 and the limiting pin 13. The boss 12 in the middle of the end face 11 and the limiting pin 13 on the outer edge cooperate to stably limit the cutting tool 2 in a specific position, ensuring that the cutting tool 2 will not deviate during processing, thereby improving processing accuracy. The limiting pin 13 is fixed in the limiting hole 14 by an interference fit, and the connection is firm and reliable. During the high-speed rotation and cutting process of the reamer, the limiting pin 13 will not easily loosen or fall off, ensuring the stable limiting effect on the cutting tool 2. The firm limiting pin 13 can better cooperate with the boss to accurately limit the cutting tool in the circumferential direction and resist a certain torque. The limiting pin 13 is cylindrical.

[0029] In this embodiment, as Figure 3 , 4 As shown in Figures 5 and 6, the blade 2 has a screw through hole 21 and a screw countersunk hole 22 at its center. The diameter of the screw countersunk hole 22 is larger than the diameter of the screw through hole 21. The screw countersunk hole 22 is located away from the end face 11 of the screw through hole 21. A force-bearing surface 23 is provided at the junction of the screw through hole 21 and the screw countersunk hole 22. The end face 11 has a threaded hole 17 corresponding to the screw 3. The center of the threaded hole 17 is eccentrically set with the center of the screw through hole 21. When the screw 3 is screwed into the reamer 1, the screw 3 generates a tightening force to fasten the blade 2 to the reamer 1. The screw head 31 acts on the force-bearing surface 23. When the screw 3 is tightened, the eccentric setting causes the screw 3 to generate a lateral pressure on the blade 2 during the tightening process. This lateral pressure, combined with the vertical pressure, increases the clamping force between the blade 2 and the reamer 1, making the blade 2 more stable and less prone to loosening during processing.

[0030] In this embodiment, as Figure 6 As shown, the blade 2 has three cutting sections: a first cutting section 24, a second cutting section 25, and a third cutting section 26. Each cutting section is arranged at 120-degree intervals around the center of the blade, forming a rotationally symmetrical structure. A first side surface 241 is formed between the first cutting section 24 and the second cutting section 25, and a second side surface 251 is formed between the second cutting section 25 and the third cutting section 26. The first side surface 241 abuts against the side of the boss 12, and the second side surface 251 abuts against the limiting pin 13. Only one cutting section is used during operation. During cutting, the cutting force is transmitted to the blade 2 through the cutting section. The boss 12 and the limiting pin 13 abut against the two sides of the blade 2, effectively distributing the cutting force to the reamer 1, reducing the stress on the blade 2, and extending the service life of the blade 2.

[0031] In this embodiment, as Figure 1 ,2 As shown, the radial side of the reamer bar 1 is provided with six chip grooves 15 at unequal angles. The unequal angle arrangement of the chip grooves 15 allows chips to be discharged from different positions along different paths, avoiding chip accumulation in the same position, thereby improving chip removal efficiency, reducing chip interference with the machining process, and reducing the risk of tool damage and decreased machining quality due to chip blockage.

[0032] In this embodiment, as Figure 1 , 2 As shown, the chip groove 15 is provided with cooling water holes 16. During the reaming process, a large amount of heat is generated, causing the tool and workpiece temperatures to rise. The cooling water holes can spray coolant to reduce the temperature of the tool and workpiece, preventing tool overheating and wear and workpiece deformation.

[0033] In this embodiment, as Figure 5 As shown, the screw 3 includes a screw head 31 and a screw 32, and the screw head 31 is provided with a plum blossom-shaped groove 311.

[0034] In this embodiment, as Figure 1 , 2 As shown, the end of the reamer bar 1 furthest from the blade 2 is provided with an external connection mechanism 18, which is connected to the machine tool spindle. The external connection structure can be adjusted according to customer needs to improve adaptability.

[0035] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A reamer with an indexable blade, characterized in that: The device includes a reamer rod (1), at least one set of blades (2), and screws (3). The reamer rod (1) has an end face (11) at its end and a blade (2) on the outer edge of the end face (11). The blade (2) is connected to the reamer rod (1) by screws (3). The blade (2) has at least three cutting parts. One of the cutting parts is placed in the working position by indexing the blade (2).

2. The indexable blade reamer according to claim 1, characterized in that: The end face (11) is provided with a boss (12), a limiting pin (13) and a limiting hole (14). The boss (12) is located in the middle of the end face (11). The limiting pin (13) is fixed in the limiting hole (14) by interference fit. The blade (2) is limited between the boss (12) and the limiting pin (13).

3. The indexable blade reamer according to claim 2, characterized in that: The blade (2) has a screw through hole (21) and a screw countersunk hole (22) at its center. The diameter of the screw countersunk hole (22) is larger than the diameter of the screw through hole (21). The screw countersunk hole (22) is located in the direction away from the end face (11) from the screw through hole (21). A force-bearing surface (23) is provided at the junction of the screw through hole (21) and the screw countersunk hole (22). The end face (11) has a threaded hole (17) corresponding to the screw (3). The center of the threaded hole (17) is eccentrically set with the center of the screw through hole (21).

4. The indexable blade type reamer according to claim 3, characterized in that: The blade (2) is provided with three cutting parts, namely the first cutting part (24), the second cutting part (25), and the third cutting part (26). Each cutting part is arranged at 120-degree intervals around the center of the blade (2) and has a rotationally symmetrical structure. The first cutting part (24) and the second cutting part (25) form a first side surface (241), and the second cutting part (25) and the third cutting part (26) form a second side surface (251). The first side surface (241) abuts against the side of the boss (12), and the second side surface (251) abuts against the limiting pin (13).

5. A reamer with an indexable blade according to claim 4, characterized in that: The reamer bar (1) has multiple chip grooves (15) on its radial side with unequal angles.

6. A reamer with an indexable blade according to claim 5, characterized in that: The chip trough (15) is provided with cooling water holes (16).

7. A reamer with an indexable blade according to claim 3, characterized in that: The screw (3) includes a screw head (31) and a screw rod (32), and the screw head (31) is provided with a plum blossom-shaped groove (311).

8. A reamer with an indexable blade according to claim 1, characterized in that: The reamer bar (1) is provided with an external connection mechanism (18) at one end away from the blade (2), and the external connection mechanism (18) is connected to the machine tool spindle.

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