Metal ceramic adjustable reamer

Abstract

The utility model discloses a metal ceramic adjustable reamer which comprises a reamer body composed of a reamer handle and a reamer head, the front end of the reamer handle is fixedly connected with the reamer head, an adjusting assembly capable of adjusting the radial size of the reamer head is arranged on the front end face of the reamer head, eight blades used for cutting are arranged on the outer ring face of the reamer head, and the reamer head is fixedly connected with the reamer handle. The eight blades are arranged on the outer ring face of the tool bit in an unequal-division mode in a surrounding mode, and a tool groove used for assisting in chip removal is formed in one side of each blade. According to the adjustable metal ceramic reamer, due to the unequal design of the blades, cutting force is more evenly distributed on the reamer head, local stress concentration can be reduced, the overall strength and durability of the reamer are improved, meanwhile, abrasion of the reamer can be reduced especially when materials with high hardness or non-uniform internal structures are machined, and the service life of the reamer is prolonged. And the position of the blade can be adjusted in cooperation with the adjusting assembly on the tool bit, so that holes with different sizes can be machined, repeated replacement is not needed, and convenience is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of machining, especially relates to metal ceramic adjustable reamer. BACKGROUND

[0002] The reamer is a rotary cutter with one or more teeth to remove a thin layer of metal from the surface of a machined hole, and the reamer is a rotary finishing cutter with straight or helical blades, which is suitable for precision machining with high dimensional accuracy and low surface roughness. The machining precision of the reamer is usually higher than that of ordinary machining tools due to the small cutting amount, and the reamer can be manually operated or installed on a drilling machine for work. Composite material is a special material composed of two or more materials with different properties through physical or chemical methods, which is suitable for aviation, automobile and other fields. The special combination determines that it is a difficult-to-machine material.

[0003] At present, when machining the bearing hole of the steel sleeve in the new energy automobile motor shell (aluminum alloy), the internal crystal organization changes after the bearing hole steel sleeve (45 steel) is cast by high pressure (650 degrees Celsius) or low pressure, which may cause uneven hardness of the internal and surface oxidation layer of the steel sleeve or increase the overall hardness (for example, the hardness of the formed martensite organization is higher than that of the original pearlite or ferrite organization), which causes the wear of the traditional cutter to be intensified when cutting the material with high hardness, and the cutting edge of the cutter is prone to wear, chipping and other phenomena when cutting the high-hardness area, thereby reducing the service life of the cutter. UTILITY MODEL CONTENT

[0004] In view of the problems existing in the prior art, the utility model provides a metal ceramic adjustable reamer, which can adjust the precision and improve the cutting efficiency through the design of the special cutting edge matched with the adjustment of the cutting edge diameter, and realizes the technical effect of stabilizing the cutter life.

[0005] To solve the above technical problems and realize the above technical effects, the utility model realizes the following technical scheme:

[0006] The technical scheme of the utility model is: a metal ceramic adjustable reamer, which comprises a reamer composed of a handle and a head, the front end of the handle is fixedly connected with the head, the front end face of the head is provided with an adjusting assembly capable of adjusting the radial size of the head, the outer ring face of the head is provided with a blade for cutting, the blade is provided with eight, the eight blades are designed to be unevenly divided and arranged around the outer ring face of the head, and the surface of the head and one side of each blade are provided with a knife groove for assisting chip removal.

[0007] Further, the interval angles of the eight blades are 49.5°, 46.5°, 43.5°, 40.5°, 42°, 44°, 46° and 48° in turn.

[0008] Further, the adjusting assembly comprises an adjusting groove formed in the front end surface of the tool head, an inner wall of the adjusting groove is rotationally connected with a differential screw coaxial with the tool head, a surface of the differential screw is threadedly connected with an expansion stack capable of expanding the diameter of the tool head, an outer annular surface of the expansion stack is in contact with the inner wall of the adjusting groove, and a front end surface of the differential screw is formed with a hexagonal groove.

[0009] Further, the diameter of the tool head is adjustable in the range of 0-48 μm.

[0010] Further, the diameter of the tool head is expanded by 2 μm when the differential screw is rotated by 30° clockwise each time.

[0011] Further, the tool handle is in straight handle design, and the rear end of the tool handle is connected with a numerical control center.

[0012] Further, the rear end of the tool handle is provided with a connecting disc, and a mounting seat connected with the numerical control center is fixedly installed at the rear end of the connecting disc.

[0013] Further, a communication hole is formed through the axis of the tool handle, a plurality of air permeation holes in communication with the rear end of the communication hole are formed at intervals on the surface of the connecting disc, and the front end of the communication hole is in communication with the adjusting groove.

[0014] Further, a connecting groove connected with the numerical control center is formed at the tail end of the mounting seat, and a clamping groove is formed on the surface of the mounting seat.

[0015] Further, the rear end of the tool groove is in chamfered design.

[0016] The beneficial technical effects of the utility model are as follows: the unequal division design of the blades makes the distribution of cutting force on the tool head more uniform, and can reduce local stress concentration, so that the overall strength and durability of the reamer are improved, especially when machining materials with high hardness or uneven internal organization, the wear of the reamer can be reduced, and the position of the blades can be adjusted by cooperating with the adjusting assembly on the tool head, when multiple holes need to be machined in a product and the tolerance of each hole is small, the reamer is expanded by rotating clockwise through an internal hexagonal wrench, the size of the tool head is adjusted, and holes of different sizes are machined without repeated replacement, which is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural perspective view of the utility model;

[0018] Figure 2 is a structural front view schematic diagram of the utility model;

[0019] Figure 3 is a structural three-dimensional schematic diagram of another embodiment of the utility model;

[0020] Figure 4 is Figure 3 a structural cross-sectional schematic diagram in the

[0021] Figure 5 is Figure 3 a structural front view schematic diagram in the

[0022] Corresponding component names represented by numbers and letters in the figure:

[0023] 1, reamer; 2, connecting disc; 21, air hole; 3, mounting seat; 4, handle; 41, communication hole; 5, head; 51, cutter groove; 52, blade; 53, differential screw; 54, hexagonal groove; 55, expansion stack; 56, adjusting groove. DETAILED DESCRIPTION

[0024] In order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, the specific embodiments of the utility model are further described in detail below, the following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0025] Referring to the accompanying Figures 1-2 As shown in the figure, the metal ceramic adjustable reamer of implementation one comprises a reamer 1 composed of a handle 4 and a head 5, the front end of the handle 4 is fixedly connected with the head 5, the handle 4 is designed as a straight handle, and the rear end of the handle 4 is connected with a numerical control center, the front end face of the head 5 is provided with an adjusting assembly capable of adjusting the radial size of the head 5, the adjusting assembly comprises an adjusting groove 56 opened in the front end face of the head 5, the inner wall of the adjusting groove 56 is rotatably connected with a differential screw 53 coaxial with the head 5, the surface of the differential screw 53 is threadedly connected with an expansion stack 55 capable of expanding the diameter size of the head 5, the outer ring surface of the expansion stack 55 is in contact with the inner wall of the adjusting groove 56, the front end face of the differential screw 53 is provided with a hexagonal groove 54, the diameter of the head 5 can be adjusted in the range of 0-48 μm, when the differential screw 53 is rotated clockwise by 30°, the diameter of the head 5 is expanded by 2 μm,

[0026] When the tool head 5 needs to be expanded, the hexagonal wrench is inserted into the hexagonal groove 54, and then the hexagonal wrench is rotated clockwise, so that the differential screw 53 is driven to rotate clockwise through the hexagonal groove 54, and then the diameter of the expansion stack 55 starts to expand, thereby expanding the tool head 5, so that the distance between the blades 52 is expanded. When the hexagonal wrench is rotated clockwise by 30°, the diameter of the tool head 5 is expanded by 2μm. The initial diameter of the tool head 5 without sharpening is not less than the nominal size, and when the total rotation is 720°, the diameter of the tool head 5 is expanded by 48μm, and then the expansion cannot continue. When the differential screw 53 is then rotated counterclockwise, the diameter of the expansion stack 55 starts to shrink, and the diameter of the tool head 5 is reset to shrink, so that when similar holes with basically the same size but different tolerances need to be machined, different tolerance tool heads 5 do not need to be replaced for machining, solving the problem that when similar holes need to be machined, the staff needs to replace the tool repeatedly, which is more troublesome.

[0027] The outer ring surface of the tool head 5 is provided with blades 52 for cutting. The eight blades 52 are arranged in unequal division around the outer ring surface of the tool head 5. The surface of the tool head 5 and one side of each blade 52 are provided with a tool groove 51 for assisting in chip removal.

[0028] The unequal division of the plurality of blades 52 around the outer ring surface of the tool head 5 makes the distribution of cutting force on the tool head 5 more uniform when drilling the steel sleeve, reduces the wear of the reamer 1, and improves the service life of the reamer 1.

[0029] Further, the interval angles of the eight blades 52 in unequal division are 49.5°, 46.5°, 43.5°, 40.5°, 42°, 44°, 46° and 48°, respectively.

[0030] In actual use, the number of blades 52 is preferably eight. The unequal division of the eight blades 52 produces a cutting force that is more uniform than that of ordinary tools when machining materials with high hardness or uneven internal structure. The unequal division of the eight blades 52 produces a cutting force that is more uniform on the tool head 5, reduces local stress concentration, and changes the formation and breaking mode of the chips, making the chips more likely to break. When machining some materials with high toughness, good chip breaking performance can prevent the chips from winding around the tool head 5, affecting the smooth cutting, and also reducing the scratching of the machined surface by the chips, ensuring the service life of the reamer 1.

[0031] Referring to FIG. 1, Figures 3-5As shown, the metal ceramic adjustable reamer of implementation two comprises a reamer 1 composed of a shank 4 and a head 5, the rear end of the shank 4 is provided with a connecting disc 2, the rear end of the connecting disc 2 is fixedly installed with a mounting seat 3 connected with a numerical control center, the tail end of the mounting seat 3 is provided with a connecting groove connected with the numerical control center, and the surface of the mounting seat 3 is provided with a clamping groove, the mounting seat 3 can be positioned and installed with the numerical control center through the clamping groove, then clamped and connected through the connecting groove, and finally fixedly installed.

[0032] The front end of the shank 4 is fixedly connected with the head 5, the front end face of the head 5 is provided with an adjusting assembly capable of adjusting the radial size of the head 5, the adjusting assembly comprises an adjusting groove 56 provided on the front end face of the head 5, the inner wall of the adjusting groove 56 is rotationally connected with a differential screw 53 coaxial with the head 5, the surface of the differential screw 53 is threadedly connected with an expansion stack 55 capable of expanding the diameter of the head 5, the outer ring surface of the expansion stack 55 is in contact with the inner wall of the adjusting groove 56, the front end face of the differential screw 53 is provided with a hexagonal groove 54, and the diameter of the head 5 can be adjusted in the range of 0-48μm, and when the differential screw 53 is rotated clockwise by 30°, the diameter of the head 5 is expanded by 2μm.

[0033] When it is necessary to finely adjust the blade pitch of the blade 52 on the head 5, a hexagonal wrench can be inserted into the hexagonal groove 54, then the hexagonal wrench is rotated clockwise to drive the differential screw 53 to rotate clockwise through the hexagonal groove 54, then the diameter of the expansion stack 55 begins to expand, thereby expanding the head 5 to expand the pitch of the blade 52, wherein when the hexagonal wrench is rotated clockwise by 30°, the diameter of the head 5 is expanded by 2μm, the initial diameter of the unsharpened head 5 is not less than the nominal size, and when the total rotation is 720°, the diameter of the head 5 is expanded by 48μm, and thereafter the expansion cannot continue; when the differential screw 53 is then rotated counterclockwise, the diameter of the expansion stack 55 begins to decrease, and the diameter of the head 5 is reset to shrink, thereby facilitating the machining of similar holes with basically the same size but different tolerances without the need to replace different-tolerance head 5 for machining, solving the problem that when there are many similar holes to be machined, the staff needs to repeatedly replace the tool, which is more troublesome.

[0034] The outer ring surface of the head 5 is provided with eight blades 52 for cutting, the eight blades 52 are arranged in unequal division around the outer ring surface of the head 5, and the surface of the head 5 and located on one side of each blade 52 is provided with a blade groove 51 for assisting in chip removal, and the unequal division between the eight blades 52 is composed of interval angles of 49.5°, 46.5°, 43.5°, 40.5°, 42°, 44°, 46° and 48° in sequence.

[0035] By unequal division design of the plurality of blades 52, the blades 52 are preferably eight in number, and the unequal division angle between the eight blades 52 is designed, so that the cutting force generated by the eight unequal division blades 52 is more evenly distributed on the head 5 when machining materials with high hardness or uneven internal organization, reducing local stress concentration, and the unequal division design of the blades 52 can change the formation and breaking mode of the chip, making the chip more easily broken. When machining some materials with high toughness, good chip breaking performance can prevent the chip from winding around the head 5, affecting the smooth cutting, and also reducing the scratch of the chip on the machined surface, ensuring the service life of the reamer 1.

[0036] The through hole 41 is provided at the shaft center of the handle 4, the surface of the connecting disc 2 is provided with a plurality of air holes 21 which are spaced apart and communicated with the rear end of the through hole 41, the front end of the through hole 41 is communicated with the adjusting groove 56, and the through hole 41 is provided. When the differential screw 53 rotates, the differential screw 53 moves inward, the space in the adjusting groove 56 becomes smaller, the gas can enter the inside of the air hole 21 and be discharged through the through hole 41, the air extrusion is reduced, and the problem that there is great resistance when the differential screw 53 is adjusted is solved, the structure is simple, time and labor are saved.

[0037] The above is only the preferred embodiment of the present application, and is not used to limit the present application. It should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection scope of the present application.

Claims

1. A cermet adjustable reamer, characterized in that, Include: Reamer (1) composed of handle (4) and head (5), the front end of the handle (4) is fixedly connected with the head (5), the front end face of the head (5) is provided with an adjusting assembly capable of adjusting the radial size of the head (5), the outer ring surface of the head (5) is provided with a blade (52) for cutting, the blade (52) is provided with eight, eight said blade (52) is unevenly divided around the outer ring surface of the head (5), the surface of the head (5) and located on one side of each said blade (52) is provided with a tool groove (51) for assisting chip removal.

2. The cermet adjustable reamer according to claim 1, wherein The interval angle of the uneven division design between the eight blades (52) is 49.5°, 46.5°, 43.5°, 40.5°, 42°, 44°, 46° and 48° in turn.

3. The cermet adjustable reamer according to claim 1, wherein The adjusting assembly comprises an adjusting groove (56) opened in the front end face of the head (5), the inner wall of the adjusting groove (56) is rotatably connected with a differential screw (53) coaxial with the head (5), the surface of the differential screw (53) is threadedly connected with an expansion stack (55) capable of expanding the diameter of the head (5), the outer ring surface of the expansion stack (55) is in contact with the inner wall of the adjusting groove (56), and the front end face of the differential screw (53) is provided with a hexagonal groove (54).

4. The cermet adjustable reamer according to claim 3, wherein The diameter of the head (5) can be adjusted in the range of 0-48μm.

5. The cermet adjustable reamer according to claim 4, wherein When the differential screw (53) rotates 30° clockwise each time, the diameter of the head (5) expands 2μm.

6. The cermet adjustable reamer according to claim 1, wherein The handle (4) is designed as a straight handle, and the rear end of the handle (4) is connected with a numerical control center.

7. The cermet adjustable reamer according to claim 3, wherein The rear end of the handle (4) is provided with a connecting disc (2), and the rear end of the connecting disc (2) is fixedly installed with a mounting seat (3) connected with the numerical control center.

8. The cermet adjustable reamer according to claim 7, wherein A communication hole (41) is through-opened at the shaft center of the handle (4), a plurality of air holes (21) are annularly and intervally provided on the surface of the connecting disc (2) and communicated with the rear end of the communication hole (41), and the front end of the communication hole (41) is communicated with the adjusting groove (56).

9. The cermet adjustable reamer according to claim 7, wherein The tail end of the mounting seat (3) is provided with a connecting groove connected with the numerical control center, and the surface of the mounting seat (3) is provided with a clamping groove.

10. The cermet adjustable reamer of claim 1 wherein, The rear end of the tool groove (51) is chamfered.

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