Reverse chip removal reamer with replaceable chip stopping block assembled on end face

Abstract

The utility model belongs to the technical field of reamers, and particularly relates to a reverse chip removal reamer with replaceable chip stopping blocks assembled on the end face, which comprises a reamer body, a plurality of front blades and chip stopping blocks in one-to-one correspondence with the front blades are uniformly arranged at the front end of the reamer body along the circumferential direction of the reamer body, and chip removal grooves are further arranged on the reamer body. The chip stopping blocks are detachably connected to the positions, located behind the front blades, of the cutter body through screws, and chip guiding spaces communicated with the chip discharging grooves are formed between the chip stopping blocks and the corresponding front blades. A fixed plane and two positioning surfaces perpendicular to each other are arranged at the positions, corresponding to the chip stopping blocks, of the cutter body, and a threaded hole is formed in the cutter body; the chip stopping block is provided with clinging surfaces correspondingly clinging to the two positioning surfaces, and the chip stopping block is also provided with a counter bore; the axes of the counter bores and the axes of the threaded holes are parallel and arranged in a spaced mode. Screws penetrate through the counter bores and are in threaded fit with the threaded holes so that the two attaching faces can be tightly squeezed to the corresponding positioning faces. According to the chip stopping block assembly structure, the chip stopping block assembly convenience and firmness can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of reamers, and in particular relates to a reverse chip removal reamer with a replaceable chip blocking block mounted on the end face. Background Art

[0002] The engine downsizing and lightweighting is one of the important trends in the development of the automotive industry, which aims to reduce the size and weight of the engine while maintaining or improving its performance and efficiency. At present, the cylinder block and cylinder head of the engine are mostly made of aluminum alloy. Due to the strong toughness of aluminum, it is difficult to break chips. After cutting, long strips and ring-shaped aluminum chips are easily generated, which are easily stuck in the cavity and difficult to wash out by the cleaning machine. The residual aluminum chips in the cavity will cause serious hidden dangers to the quality of engine products.

[0003] In order to facilitate the cleaning of debris, the cutting tool is generally provided with a chip block, and most of the existing chip blocks are brazed and welded chip blocks, which have a relatively complex manufacturing process and are difficult to manufacture, and most of them are welded to the tool body. For example, a rear chip removal reamer with a chip block disclosed in a Chinese patent with authorization announcement number CN206981901 U includes a tool body, a blade evenly arranged along the circumference and a chip groove corresponding to the blade at the left end of the tool body, a chip block at the left end of the chip groove, and the chip block is welded to the tool body through its rear surface. The chip block can be welded to improve the connection strength, but correspondingly, when it is worn or damaged after long-term use, it is difficult to repair and replace, and it is necessary to reprocess the surface of the tool body or use special tools to disassemble the welding point, which is costly.

[0004] In response to the above-mentioned defects, a Chinese patent with authorization announcement number CN216912137U discloses a reverse chip removal tool equipped with a replaceable chip block, which includes a tool body, and a plurality of PCD tool heads and chip blocks corresponding to the PCD tool heads are evenly arranged along the circumference of the left end of the tool body, and the chip block is detachably connected above the front cutting surface of the PCD tool head. The use of a detachable method facilitates the replacement and maintenance of the chip block, avoids scrapping the entire tool, and is less costly. However, when using a detachable method, it is also necessary to consider how to improve the convenience and reliability of the assembly of the chip block to avoid loosening of the chip block. Utility Model Content

[0005] The utility model provides a reverse chip removal reamer with a replaceable chip blocking block assembled on the end face, which can improve the convenience and reliability of assembling the chip blocking block.

[0006] In order to solve the above problems, the utility model provides a reverse chip removal reamer with a replaceable chip blocking block on the end face, which adopts the following technical solutions:

[0007] A reverse chip removal reamer with a replaceable chip stopper block mounted on the end face comprises a tool body, a front end of the tool body being provided with a plurality of front blades evenly arranged along its circumference and chip stopper blocks corresponding to the front blades one by one, the tool body being further provided with chip grooves corresponding to the front blades, the chip stopper block being detachably connected to the tool body at a position behind the front blade in the rotational cutting direction of the front blade by means of screws, a chip guiding space connected to the chip groove being provided between the chip stopper block and the corresponding front blade; a fixed plane and two mutually perpendicular positioning surfaces are provided at a position corresponding to each chip stopper block on the tool body, a threaded hole is provided on the tool body at a position corresponding to the fixed plane; the chip stopper block has a contact surface corresponding to the two positioning surfaces, and a countersunk hole is also provided on the chip stopper block; the axis of the countersunk hole is parallel to the axis of the threaded hole and is arranged at intervals, the screw passes through the countersunk hole and cooperates with the thread of the threaded hole to squeeze the two contact surfaces onto the corresponding positioning surfaces.

[0008] The beneficial effect is: when installing the chip block, place the chip block on a fixed plane, and make the two contact surfaces on the chip block respectively abut against the two positioning surfaces, so as to realize the rapid positioning of the chip block; then pass the screw through the countersunk hole and engage with the threaded hole, and during the process of screwing the screw, since the axes of the countersunk hole and the threaded hole do not coincide, the screw will drive the two contact surfaces to squeeze against the corresponding positioning surfaces, thereby realizing the rapid and tight assembly between the chip block and the cutter body.

[0009] Furthermore, the front end of the cutter body is provided with two root cleaning holes which are centrally symmetrical about the central axis of the cutter body. After the chip blocking block is fixed to the cutter body, the intersection of the two abutting surfaces on the chip blocking block is located in the corresponding root cleaning hole.

[0010] Beneficial effect: the root cleaning hole is provided, which is convenient for processing and manufacturing on the one hand, and can avoid the chip blocking block on the other hand.

[0011] Furthermore, the chip blocking block has a guiding bevel and a guiding arc surface opposite to the side of the front blade. In the radial direction of the tool body, the guiding arc surface is located on the inner side of the guiding bevel; the guiding bevel is inclined from front to back in the direction away from the front blade to form a V-shaped chip guiding space between the guiding bevel and the front blade.

[0012] Beneficial effect: Under the condition of ensuring its own strength, it is convenient to guide the chips from the chip guide space to the chip discharge groove.

[0013] Furthermore, two front blades and two chip blocking blocks are provided, and both are centrally symmetrically arranged around the central axis of the cutter body.

[0014] Beneficial effect: two front blades are provided, the cutting forces of the two front blades can be balanced with each other, the overall structure is simpler, and the use cost is lower.

[0015] Furthermore, two rear blades are installed on the cutter body, and the two rear blades are arranged in a central symmetrical manner around the central axis of the cutter body. The cutting edge of the rear blade protrudes outward from the cutting edge of the front blade in the radial direction of the cutter body to process two holes with different diameters and the chamfer of the hole opening between the two holes.

[0016] Beneficial effect: The processing of variable diameter holes can be realized.

[0017] Furthermore, the tool body is provided with a front mounting groove for installing the front blade and a rear mounting groove for installing the rear blade. The front mounting groove and the rear mounting groove are arranged in a front-to-back spacing in the direction of the central axis of the tool body, and the corresponding front mounting groove and the rear mounting groove are both connected to the same chip removal groove.

[0018] Beneficial effect: The number of chip removal grooves on the cutter body can be reduced, thereby ensuring the structural strength of the cutter body.

[0019] Further, the side wall of the chip removal groove communicating with the front mounting groove and the rear mounting groove is defined as a first side wall, and the side surfaces of the front blade and the rear blade facing the chip removal groove are flush with the first side wall.

[0020] Beneficial effect: The design that the sides of the front blade and the rear blade are flush with the wall of the chip groove helps to better guide and accelerate the discharge of chips, reduce the obstruction of chips to the processing surface, reduce cutting resistance, and improve processing efficiency.

[0021] Furthermore, the front blade and the rear blade have the same thickness.

[0022] Beneficial effect: The front blade and the rear blade are subjected to uniform force during cutting, which can ensure the consistency of the hole size, which is particularly important for the processing of variable diameter holes.

[0023] Furthermore, the tool body comprises a coaxially arranged small-diameter cutting section and a large-diameter cutting section, and the chip blocking block has an outer arc surface coaxially arranged with the outer peripheral side surface of the small-diameter cutting section; the outer arc surface is coplanar with the outer peripheral side surface of the small-diameter cutting section.

[0024] Beneficial effect: The maximum chip blocking range can be achieved, and the outer arc surface will not hinder the cutting of the front blade.

[0025] Furthermore, the tool body is provided with a coaxial main coolant channel and coolant branch channels symmetrically arranged on both radial sides of the main coolant channel, and the two branch coolant channels intersect with the main coolant channel; the main coolant channel extends to the rear end face of the tool body, and the branch coolant channels extend to the side wall of the tool body and are located beside the corresponding front blade.

[0026] Beneficial effect: Coolant flows out from the front side of the cutter body, which can effectively drive the chips to be discharged backwards. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0028] Figure 1 Schematic diagram of the three-dimensional structure of the reverse chip removal reamer with a replaceable chip blocking block on the end face of the utility model Figure 1 ;

[0029] Figure 2 Schematic diagram of the three-dimensional structure of the reverse chip removal reamer with a replaceable chip blocking block on the end face of the utility model Figure 2 ;

[0030] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0031] Figure 4 for Figure 1 Bottom view of

[0032] Figure 5 A schematic diagram showing the coolant passage;

[0033] Figure 6 It is a schematic diagram of the structure of the knife body;

[0034] Figure 7 Schematic diagram of the chip block structure Figure 1 ;

[0035] Figure 8 Schematic diagram of the chip block structure Figure 2 .

[0036] Description of reference numerals:

[0037] 1. Cutter body; 2. Small-diameter cutting section; 3. Large-diameter cutting section; 4. Front blade; 5. Rear blade; 6. Front mounting groove; 7. Rear mounting groove; 8. Chip removal groove; 9. First side wall; 10. Chip block; 11. Outer arc surface; 12. Close surface; 13. Positioning surface; 14. Fixed plane; 15. Countersunk hole; 16. Threaded hole; 17. Screw; 18. Guide slope; 19. Guide arc surface; 20. Root cleaning hole; 21. Coolant main channel; 22. Coolant branch channel; 23. Chip guide space. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0039] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0040] Embodiment 1 of the reverse chip removal reamer provided by the utility model with a replaceable chip blocking block mounted on the end face:

[0041] like Figure 1 , Figure 2 and Figure 6 As shown, the reverse chip removal reamer with a replaceable chip block installed on the end face includes a tool body 1, and the tool body 1 includes a small diameter cutting section 2 and a large diameter cutting section 3 which are coaxially arranged, and the small diameter cutting section 2 is located on the front side. The front end of the small diameter cutting section 2 is provided with two front mounting grooves 6 which are evenly arranged along its circumference, and a front blade 4 is installed in each front mounting groove 6. The front end of the small diameter cutting section 2 is detachably connected to two chip blocks 10 by means of screws 17, and the chip blocks 10 correspond one-to-one to the front blade 4. In the rotational cutting direction of the front blade 4, the chip blocks 10 are located behind the front blade 4. The front blade 4 and the chip block 10 are centrally symmetrically arranged around the central axis of the tool body 1. The tool body 1 is also provided with two chip removal grooves 8 which correspond one-to-one to the front blade 4, and the two chip removal grooves 8 pass through the small diameter cutting section 2 and the large diameter cutting section 3. As shown Figure 3 As shown, a chip guiding space 23 communicating with the chip discharge groove 8 is provided between the chip blocking block 10 and the corresponding front blade 4 .

[0042] Specifically, Figure 6 As shown, a fixed plane 14 and two mutually perpendicular positioning surfaces 13 are provided at the position corresponding to each chip block 10 on the small-diameter cutting section 2, and a threaded hole 16 is provided on the cutter body 1 at the position corresponding to the fixed plane 14, and the threaded hole 16 is a blind hole. Figure 7 and Figure 8 As shown, the chip block 10 has a contact surface 12 corresponding to the two positioning surfaces 13, and the two contact surfaces 12 are perpendicular to each other; the chip block 10 is also provided with a countersunk hole 15. The axis of the countersunk hole 15 is parallel to the axis of the threaded hole 16 and arranged at intervals. When installing, the chip block 10 is placed on the fixed plane 14, and the screw 17 is passed through the countersunk hole 15 and threadedly engaged with the threaded hole 16. During the screwing process, the screw 17 pushes the chip block 10 so that the two contact surfaces 12 are squeezed tightly against the corresponding positioning surfaces 13, so that the chip block 10 can be quickly and firmly assembled.

[0043] like Figure 4 and Figure 6 As shown, the front end of the small-diameter cutting section 2 is also provided with two root cleaning holes 20 which are centrally symmetrical around the central axis of the cutter body 1. After the chip blocking block 10 is fixed to the cutter body 1, the intersection of the two abutting surfaces 12 on the chip blocking block 10 is located in the corresponding root cleaning hole 20.

[0044] like Figure 3 and Figure 8 As shown, the chip block 10 has a guide bevel 18 and a guide arc surface 19 opposite to the side of the front blade 4, and in the radial direction of the cutter body 1, the guide arc surface 19 is located on the inner side of the guide bevel 18. The guide bevel 18 is inclined from front to back in a direction away from the front blade 4, so that a V-shaped chip guide space 23 is formed between the guide bevel 18 and the front blade 4, and the chip guide space 23 is connected to the chip discharge groove 8. The chip block 10 has an outer arc surface 11 coaxially arranged with the outer peripheral side of the small-diameter cutting section 2; the outer arc surface 11 is coplanar with the outer peripheral side of the small-diameter cutting section 2.

[0045] In this embodiment, Figure 6 As shown, the cutter body 1 is also provided with two rear mounting grooves 7 for mounting the rear blade 5. The front mounting groove 6 and the rear mounting groove 7 are arranged in a front-to-back spacing in the direction of the central axis of the cutter body 1, and the corresponding front mounting grooves 6 and rear mounting grooves 7 are both connected to the same chip removal groove 8. Among them, the front mounting grooves 6 are all located on the small-diameter cutting section 2, and the rear mounting grooves 7 span the small-diameter cutting section 2 and the large-diameter cutting section 3. A rear blade 5 is installed in each rear mounting groove 7, and the two rear blades 5 are arranged in a central symmetric manner around the central axis of the cutter body 1. The cutting edge of the rear blade 5 protrudes outward from the cutting edge of the front blade 4 in the radial direction of the cutter body 1 to process two holes with different diameters and the chamfer of the hole opening between the two holes.

[0046] like Figure 1 As shown, for the convenience of production, in this embodiment, the front blade 4 and the rear blade 5 have the same thickness, and the side wall of the chip groove 8 connected with the front mounting groove 6 and the rear mounting groove 7 is defined as the first side wall 9. After the front blade 4 and the rear blade 5 are fixed, the side surfaces of the front blade 4 and the rear blade 5 facing the chip groove 8 are flush with the first side wall 9. Of course, in other embodiments, the thickness of the front blade 4 and the rear blade 5 may also be different.

[0047] A main coolant channel 21 and coolant branch channels 22 symmetrically arranged on both radial sides of the main coolant channel 21 are provided at the central axis of the cutter body 1 , and the two coolant branch channels 22 intersect with the main coolant channel 21 .

[0048] It should be noted that the number of the front blade 4 and the chip block 10 in the present embodiment is two. Of course, in actual use, multiple front blades 4 and chip blocks 10 can be reasonably arranged according to demand, such as three, four, etc., and are not limited to the two in the present application.

[0049] The present application can replace the chip block 10 of different materials according to different processing conditions. The chip block 10 is reasonably positioned and supported, firmly fixed, and can be repeatedly and quickly disassembled and assembled. The entire reamer has a simple structure, is easy to mass produce, and can effectively prevent chips from falling into the processed hole.

[0050] Embodiment 2 of the reverse chip removal reamer provided by the utility model with a replaceable chip blocking block mounted on the end face:

[0051] The main difference between the embodiment 1 and the embodiment 1 is that: in the embodiment 1, a rear blade is also provided on the cutter body. In the present embodiment, no rear blade is provided, only a front blade is provided, and the reamer is used to process equal-diameter holes.

[0052] Embodiment 3 of the reverse chip removal reamer provided by the utility model with a replaceable chip blocking block mounted on the end face:

[0053] The main difference between this embodiment and the first embodiment is that: in the first embodiment, the rear mounting groove and the front mounting groove are arranged at intervals in the direction of the central axis of the cutter body. In this embodiment, the rear mounting groove and the front mounting groove are arranged at intervals in the circumferential direction of the cutter body, and each front mounting groove corresponds to a chip removal groove, and each rear mounting groove corresponds to a chip removal groove.

[0054] Embodiment 4 of the reverse chip removal reamer provided by the utility model with a replaceable chip blocking block mounted on the end face:

[0055] The main difference between this embodiment and the first embodiment is that in the first embodiment, the outer arc surface of the chip blocking block is coplanar with the outer peripheral side surface of the small-diameter cutting segment. In this embodiment, the outer arc surface of the chip blocking block is located radially inward of the outer peripheral side surface of the small-diameter cutting segment.

[0056] In the description of the present specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reverse chip removal reamer with a replaceable chip stop block mounted on the end face, comprising a cutter body, a front end of which is provided with a plurality of front blades evenly arranged along its circumference and chip stop blocks corresponding to the front blades one by one, a cutter body is further provided with chip removal grooves corresponding to the front blades one by one, in the rotational cutting direction of the front blade, the chip stop block is detachably connected to the position of the cutter body located behind the front blade by a screw, and a chip guide space connected to the chip removal groove is provided between the chip stop block and the corresponding front blade; characterized in that: The position of each chip blocking block on the cutter body is provided with a fixed plane and two mutually perpendicular positioning surfaces, and the position of the cutter body corresponding to the fixed plane is provided with a threaded hole; The chip blocking block has a close contact surface corresponding to the two positioning surfaces, and a countersunk hole is also provided on the chip blocking block; The axis of the countersunk hole is parallel to the axis of the threaded hole and is arranged at intervals. The screw passes through the countersunk hole and is threadably matched with the threaded hole to squeeze the two abutting surfaces onto the corresponding positioning surfaces.

2. The reverse chip removal reamer with a replaceable chip block mounted on the end face according to claim 1, characterized in that: The front end of the cutter body is also provided with two root cleaning holes which are centrally symmetrical around the central axis of the cutter body. After the chip blocking block is fixed to the cutter body, the intersection of the two abutting surfaces on the chip blocking block is located in the corresponding root cleaning holes.

3. The reverse chip removal reamer with a replaceable chip block mounted on the end face according to claim 1, characterized in that: The chip blocking block has a guiding bevel and a guiding arc surface opposite to the side of the front blade. In the radial direction of the tool body, the guiding arc surface is located on the inner side of the guiding bevel; the guiding bevel is inclined from front to back in the direction away from the front blade to form a V-shaped chip guiding space between the guiding bevel and the front blade.

4. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to any one of claims 1 to 3, characterized in that: There are two front blades and two chip blocking blocks, which are arranged in centrosymmetry around the central axis of the cutter body.

5. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to claim 4, characterized in that: The cutter body is also provided with two rear blades, which are arranged centrally and symmetrically around the central axis of the cutter body. The cutting edges of the rear blades protrude outwardly from the cutting edges of the front blades in the radial direction of the cutter body to machine two holes of different diameters and the chamfer between the two holes.

6. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to claim 5, characterized in that: The tool body is provided with a front mounting groove for mounting the front blade and a rear mounting groove for mounting the rear blade. The front mounting groove and the rear mounting groove are arranged in a front-to-back spacing in the direction of the central axis of the tool body, and the corresponding front mounting groove and the rear mounting groove are both connected to the same chip removal groove.

7. The reverse chip removal reamer with a replaceable chip block mounted on the end face according to claim 6, characterized in that: The side wall of the chip groove that is connected to the front mounting groove and the rear mounting groove is defined as a first side wall, and the side surfaces of the front blade and the rear blade facing the chip groove are flush with the first side wall.

8. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to claim 7, characterized in that: The front blade and the rear blade have the same thickness.

9. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to any one of claims 5 to 7, characterized in that: The cutter body comprises a coaxially arranged small-diameter cutting section and a large-diameter cutting section, and the chip blocking block has an outer arc surface coaxially arranged with the outer peripheral side surface of the small-diameter cutting section; the outer arc surface is coplanar with the outer peripheral side surface of the small-diameter cutting section.

10. The reverse chip removal reamer with a replaceable chip blocking block mounted on the end face according to any one of claims 1 to 3, characterized in that: The cutter body is provided with a coaxial main coolant channel and coolant branch channels symmetrically arranged on both radial sides of the main coolant channel, and the two coolant branch channels intersect with the main coolant channel; The main coolant channel extends to the rear end surface of the cutter body, and the branch coolant channel extends to the side wall of the cutter body and is located beside the corresponding front blade.

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