Large-diameter boring cutter

Abstract

The utility model relates to a large-diameter boring cutter which comprises a cutter main body, the cutter main body comprises a cutter holder, a cutter body connected with the cutter holder through an assembly part and the like, and the large-diameter boring cutter is characterized in that a shielding piece capable of partially shielding the cutter main body is arranged on the cutter holder and is provided with an exposure area for exposing a cutting part of the cutter body; a first flow channel allowing cooling liquid to flow through is formed in the shielding piece, and the shielding piece is provided with an outflow opening allowing the cooling liquid to be sprayed out. Compared with the prior art, the machining tool has the advantages that cuttings can be blocked on one side of a to-be-machined hole face through the shielding piece, and the machined hole face is prevented from being affected; the cooling liquid jetted out of the flow outlet flushes away cuttings generated by cutting to one side of the to-be-machined hole face in time, meanwhile, the cooling and lubricating functions are achieved, and in conclusion, the large-diameter boring cutter can improve the machining quality of the large-diameter inner hole.

Description

Technical Field

[0001] The utility model relates to the field of mechanical processing, in particular to a large-diameter boring tool. Background Art

[0002] A boring tool is a cutting tool commonly used for machining inner holes. It is usually used for further finishing of the inner holes that have been rough-machined. Compared with tools such as drills and reamers, boring tools can more accurately control the size and shape of the inner hole, making the inner hole have higher precision and surface quality. Therefore, they are more suitable for high-precision machining of large-diameter inner holes.

[0003] In order to further improve the processing quality of high-precision processing of large-diameter inner holes, some large-diameter high-precision boring tools have appeared in the prior art, such as the Chinese utility model patent "A large-diameter adjustable precision boring tool" with patent number CN202220234949.8 (publication number CN217192638U). The application provides a large-diameter adjustable precision boring tool, including an assembly part for mounting a blade and a counterweight part with the same weight as the assembly part, and also includes a diameter adjusting part that can fine-tune the vertical distance from the blade to the axis of the tool body to improve the cutting accuracy of the boring tool.

[0004] However, in the process of using a large-diameter fine boring tool with an assembly part and a counterweight part as mentioned above to perform high-precision processing on large-diameter inner holes, the following defects exist: sometimes chips will be entangled on the tool body such as the assembly part and the counterweight part. The chips entangled on the tool body will scratch the already processed hole surface, affecting the size and processing quality of the inner hole. This situation is more likely to occur when the processing material is long-chip materials such as aluminum or when processing deep holes. Therefore, it is necessary to further improve the existing technology. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a large-diameter boring tool capable of preventing chips from affecting the processing quality of a processed hole surface in view of the above-mentioned existing technical status.

[0006] The utility model solves the above technical problems by adopting the following technical solution: the large diameter boring tool comprises a tool body, which has a relative forward direction D F and backward direction D R The tool body is capable of rotating around the center axis B of the main body along with the tool rod in the rotation direction R, and the tool body comprises:

[0007] A knife seat, having a first end surface for connecting to the knife rod, and also having a second end surface opposite to the first end surface;

[0008] A cutter body, connected to the second end surface via an assembly portion, comprising a cutting portion for cutting the hole surface to be processed;

[0009] Features:

[0010] The tool seat is provided with a shielding member capable of partially shielding the tool body, and the shielding member is provided with an exposed area for exposing the cutting portion of the tool body.

[0011] In order to prevent chips from passing through the shielding member without affecting cutting and prevent chips from damaging the processed hole surface, the shielding member is disc-shaped, and the outer circumferential surface of the shielding member is adjacent to the cutting portion, and a gap D is formed between the shielding member and the cutting portion. The gap D is the exposed area. In fact, according to needs, the shielding member can be in a variety of shapes. The disc shape is a more common one among them and can meet most situations. In fact, the shielding member can even be composed of various sub-components. In addition, the size of the gap D needs to be set to be as small as possible without affecting cutting to prevent chips from passing through.

[0012] In order to install the shielding member on the tool holder so that it can move along the central axis B of the tool body during the processing, preferably, the shielding member has a mounting portion for connecting to the tool holder, and correspondingly, the tool holder has a mating portion for mating with the mounting portion. According to needs, the mounting portion and the mating portion can be connected in a variety of ways. For example, the common method is that the mounting portion can be a through hole, the mating portion can be a threaded hole, and the connection is made by bolts.

[0013] In order to promptly flush away the chips generated by cutting to the side of the hole surface to be processed outside the shielding member, so that the chips are blocked by the shielding member to prevent the chips from affecting the processed hole surface, preferably, a first flow channel for the circulation of coolant is opened in the shielding member, and correspondingly, it also has an inlet for the coolant to flow in and an outlet for the coolant to flow out. The coolant sprayed from the outlet not only flushes away the chips generated by cutting in time, but also has the function of cooling the tool body and lubricating the cutting part, which is beneficial to protect the processed hole surface and improve the processing quality.

[0014] Furthermore, in order to improve the ability of the coolant to flush away chips, preferably, the outflow port is arranged on the outer circumferential surface of the shielding member. Such a design will make the coolant ejected from the outflow port closer to the cutting part, thereby better realizing the functions of flushing away chips, cooling, and lubricating the processed surface. In addition, according to actual needs, the outflow port can be set at other positions. For example, the tool body itself usually has a flow channel that can spray coolant toward the cutting part, commonly known as the "internal water outlet function". The outflow port can be set at a position slightly away from the cutting part. When the tool body itself does not have the internal water outlet function, the outflow port can be set to the cutting part of the tool body.

[0015] Further design, in order to enable the coolant to rotate around the central axis B of the main body during the spraying process, so as to better wash away the chips, cool and lubricate the processing surface, preferably, the shielding member is fixedly connected to the tool holder through the mounting portion and the matching portion, and the shielding member is fixedly connected to the tool holder, so that during the processing, the shielding member will rotate around the central axis B of the main body along with the tool holder, so that the sprayed coolant will rotate around the central axis B of the main body together. Such design is considered that in fact, only for the function of the shielding member itself to block chips, it only needs to be able to follow the tool holder along the forward direction D F and backward direction D R Movement, can also block chips when the shielding member does not rotate.

[0016] In order to provide coolant to the first flow channel in the shielding member, preferably, a second flow channel for the flow of coolant is opened in the tool seat, and the second flow channel is fluidly connected to the first flow channel through the inlet. Such a design allows the coolant to pass through a main flow channel such as that provided on the tool rod, and enter the first flow channel of the shielding member through the second flow channel. In this process, the tool body can also be cooled.

[0017] In order to facilitate the installation and removal of the shielding member and take into account the difficulty of maintaining the tool body, preferably, the shielding member is arranged in the forward direction D F It is arranged in front of the assembly part. In fact, the shielding member also has other installation positions. For example, a hollow area can be opened on the shielding member and it can be sleeved on the assembly part. However, the installation and disassembly of this solution is relatively inconvenient.

[0018] In order to prevent the shielding member from being too heavy and affecting the dynamic balance of the tool body, preferably, a hollow portion is partially opened on the shielding member. In addition, opening the hollow portion on the shielding member can also make the cutting part gather and entangle on the hollow portion to a certain extent, preventing the chips from moving freely on one side of the hole surface to be processed.

[0019] In order to facilitate meeting the dynamic balancing requirements of the tool body during the processing, preferably, a counterweight portion is also included, and the counterweight portion is arranged on the second end face. The counterweight portion is usually arranged to have the same weight as the assembly portion and the tool body, and is arranged relative to the assembly portion, so as to meet the dynamic balancing requirements of the tool body.

[0020] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

[0021] Compared with the prior art, the advantages of the utility model are:

[0022] 1. By providing a shielding member that can partially shield the tool body, and the shielding member has an exposed area for exposing the cutting part of the tool body, the chips can be blocked on the side of the hole surface to be processed to prevent the processed hole surface from being affected;

[0023] 2. A first flow channel for the coolant to flow is provided in the shielding member, and a flow outlet for the coolant to spray out is provided, which can not only timely flush the chips generated by cutting to the side of the hole surface to be processed, but also has the functions of cooling and lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a large diameter boring cutter in a processing state in an embodiment of the utility model;

[0025] Figure 2 This is a schematic structural diagram of a large diameter boring tool in an embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the exploded structure of a large diameter boring cutter in an embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the exploded structure of the shielding member and the knife holder in the embodiment of the utility model;

[0028] Figure 5 It is a schematic structural diagram of a shielding member and a knife seat in an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the state of a large-diameter boring cutter in the embodiment of the utility model being located at the first working position in the normal boring state;

[0030] Figure 7 It is a schematic diagram of the state of the large diameter boring cutter in the embodiment of the utility model being located at the second working position in the normal boring state;

[0031] Figure 8 It is a schematic diagram of the state of a large-diameter boring cutter in the embodiment of the utility model being located at the first working position in the reverse boring state;

[0032] Fig. 9 It is a schematic diagram of the state of the large-diameter boring cutter in the embodiment of the utility model being located at the second working position in the reverse boring state. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with specific embodiments.

[0034] like Figures 1 to 9 The large diameter boring tool in this embodiment includes a tool body, which has a relative forward direction D F and backward direction D R The tool body can rotate around the main body center axis B along with the tool bar in the rotation direction R, and the tool body includes a tool seat 11 and a tool body 12. The tool seat 11 has a first end face 111 for connecting the tool bar 2, and also has a second end face 112 relative to the first end face 111, and the tool body 12 is connected to the second end face 112 through the assembly part 13, and includes a cutting part 121 for cutting the hole surface 41 to be processed.

[0035] In order to prevent the chips generated by cutting from affecting the processed hole surface 42, a shielding member 3 capable of partially shielding the tool body 1 is also provided on the tool holder 11. The shielding member 3 is provided with an exposed area 31 for exposing the cutting portion 121 of the tool body 12. In this embodiment, the shielding member 3 is disc-shaped, and the outer circumferential surface of the shielding member 3 is adjacent to the cutting portion 121, and a gap D is formed between the shielding member 3 and the cutting portion 121. The gap D is the exposed area 31. In this embodiment, the gap D is about 6 mm. The shielding member 3 also has a mounting portion 32 for connecting with the tool holder 11. Correspondingly, the tool holder 11 has a matching portion 113 for matching the mounting portion 32. In the embodiment, the mounting portion 32 is a through hole, and the matching portion 113 is a bolt hole. The two are fixedly connected by bolts.

[0036] See also Figure 5 , a first flow channel 33 for the circulation of coolant is also provided in the shielding member 3, and correspondingly, an inlet 34 for the inflow of coolant and an outlet 35 for the outflow of coolant are also provided. The outlet 35 is mainly arranged on the outer circumferential surface of the shielding member 3, and the coolant sprayed from the outlet 35 will rotate with the shielding member 3, and the path of the rotation of the coolant will pass through the cutting portion 121 of the tool body 12, so as to better achieve the functions of flushing away chips, cooling, and lubricating the machined surface. A second flow channel 114 for the flow of coolant is provided in the tool holder 11, and the second flow channel 114 is fluidically connected to the first flow channel 33 through the inlet 34. In this embodiment, the coolant flows into the second flow channel 114 through the tool rod 2, and the tool holder 11 and the tool body 12 themselves also have an internal water outlet function.

[0037] In order to facilitate the disassembly, assembly and maintenance of the shielding member, the shielding member 3 in this embodiment is arranged in the forward direction D F It is arranged in front of the assembly portion 13, and a hollow portion 36 is partially opened on the shielding member 3. In this embodiment, there are two hollow portions 36. Finally, the large-diameter boring tool in this embodiment also includes a counterweight portion 5, which is arranged on the second end face 112 and is arranged opposite to the assembly portion 13 on which the tool body 12 is installed to meet the dynamic balance requirements.

[0038] The use process of the large diameter boring tool provided in this embodiment in the normal boring state is as follows:

[0039] like Figure 6 As shown in FIG. 1 , it is a schematic diagram of a state where a large diameter boring tool is located at the first station in a positive boring state. Since it is a positive boring state, the tool body 1 needs to be moved in the forward direction D F Therefore, the hole surface 41 to be processed is located in front of the cutting part 121, and the hole surface 42 to be processed is located behind the cutting part 121. Figure 6 H1 shown in is the length of the hole surface 41 to be processed, and H1 is about 100 mm; see Figure 7 The schematic diagram of the state of the large diameter boring tool in the second working position when the boring tool is in the normal boring state. At this time, the tool body 1 has been moved in the forward direction D F After moving a certain distance, the length H2 of the hole surface to be processed is about 60 mm. In this process, due to the existence of the shielding member 3, the chips generated by the cutting portion 121 of the tool body 12 are blocked on the side of the hole surface 41 to be processed, and will not affect the processed hole surface 42, and the chips will not be entangled on the tool body 1.

[0040] The use process of the large diameter boring tool provided in this embodiment in the reverse boring state is as follows:

[0041] As we all know, boring tools can be used not only for positive boring, but also for reverse boring, also known as "back boring". The moving direction of the tool body 1 is opposite to that of positive boring, that is, in the backward direction D R Therefore, the hole surface 42 located in front of the cutting portion 121 has been processed, and the hole surface 41 located behind the cutting portion 121 is to be processed. Figure 8 FIG. 1 is a schematic diagram of a large diameter boring tool in the first working position in the reverse boring state. At this time, the length H3 of the processed hole surface 42 is about 80 mm. Fig. 9 Schematic diagram of the state of the large diameter boring tool in the second working position when the back boring state is in progress. At this time, the tool body 1 has been moved in the backward direction D RAfter moving a certain distance, the length H4 of the processed hole surface 42 is about 120 mm. In this process, unlike straight boring, the chips generated by the cutting portion 121 of the tool body 12 may be entangled on the tool body 1, but due to the presence of the shielding member 3, the chips generated by the cutting portion 121 of the tool body 12 are blocked on the side of the hole surface 41 to be processed, and will not affect the processed hole surface 42.

Claims

1. A large diameter boring tool, comprising a tool body (1) having a defined relative forward direction (D F ) and backward direction (D R )), and the tool body (1) can rotate around the main body center axis (B) along with the tool rod (2) in the rotation direction (R), and the tool body comprises: A knife seat (11) having a first end surface (111) for connecting to a knife rod (2), and also having a second end surface (112) opposite to the first end surface (111); A cutter body (12) is connected to the second end surface (112) via an assembly portion (13), and comprises a cutting portion (121) for cutting a hole surface (41) to be processed; Features: The tool seat (11) is provided with a shielding member (3) capable of partially shielding the tool body (1), and the shielding member (3) is provided with an exposed area (31) for exposing the cutting portion (121) of the tool body (12).

2. The large diameter boring tool according to claim 1, characterized in that: The shielding member (3) is in the shape of a disk, the outer circumferential surface of the shielding member (3) is adjacent to the cutting portion (121), and a gap (D) is formed between the shielding member (3) and the cutting portion (121), and the gap (D) is the exposed area (31).

3. The large diameter boring tool according to claim 2, characterized in that: The shielding member (3) has a mounting portion (32) for connecting to the knife seat (11), and correspondingly, the knife seat (11) has a matching portion (113) for matching with the mounting portion (32).

4. The large diameter boring tool according to claim 3, characterized in that: The shielding member (3) is provided with a first flow channel (33) for the circulation of cooling liquid, and correspondingly, it also has an inlet (34) for the inflow of cooling liquid and an outlet (35) for the outflow of cooling liquid.

5. The large diameter boring tool according to claim 4, characterized in that: The outflow port (35) is arranged on the outer circumferential surface of the shielding member (3).

6. The large diameter boring tool according to claim 5, characterized in that: The shielding member (3) is fixedly connected to the knife seat (11) via the mounting portion (32) and the matching portion (113).

7. The large diameter boring tool according to claim 6, characterized in that: A second flow channel (114) for cooling liquid to flow is provided in the tool holder (11), and the second flow channel (114) is fluidically connected to the first flow channel (33) through the inlet (34).

8. The large diameter boring tool according to any one of claims 1 to 7, characterized in that: The shielding member (3) is arranged in a forward direction (D F ) is arranged in front of the assembly portion (13).

9. The large diameter boring tool according to claim 8, characterized in that: The shielding member (3) is partially provided with a hollow portion (36).

10. The large diameter boring tool according to claim 9, characterized in that: It also includes a counterweight portion (5), wherein the counterweight portion (5) is arranged on the second end surface (112).

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