Reaming and grinding integrated cutter

Abstract

The utility model discloses a reaming and grinding integrated cutter, which belongs to the technical field of machining, and specifically comprises a front-end reamer, a rear-end grinding cutter and a cutter handle part which are integrated, the front-end reamer and the rear-end grinding cutter are respectively provided with at least three cutting edges, the front-end reamer is provided with a cutting chamfer, and the rear-end reamer is provided with a cutting groove. And the edge diameter of the cutting edge on the front-end reamer is smaller than that of the rear-end grinding cutter. According to the utility model, the cutter can be reamed and then ground in a hole, and the problems of short service life of a reamer, poor reaming quality and the like caused by poor precision of a pre-hole are solved. The requirement for machine tool precision is lowered, meanwhile, machining efficiency is improved, tool configuration is reduced, and tool cost is lowered; meanwhile, the diamond grinding reamer part improves the hole wall quality, and the machining quality is stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining, and particularly relates to a combined reaming and grinding tool. Background Art

[0002] In the field of modern machining industry, there are a large number of high-precision through holes. The processing techniques and tools commonly used for machining these holes in the past are as follows: First, a two-flute twist drill is used to drill a pre-hole, and then a reamer is used to finely ream the pre-hole to meet the requirements of the drawing. However, the following problems may be encountered in actual machining:

[0003] (1) Affected by the accuracy of the existing machine tools, the comprehensive accuracy (straightness / roundness / hole diameter) of the pre-hole machined by the two-flute twist drill during drilling is insufficient, that is, there are certain "warped holes", "oblique holes", "bell-mouthed holes", and "elliptical holes" in the actual machining of the pre-hole. Since the machining allowance of a general reamer is small and the accuracy requirement for the machining allowance is high, the large deviation of the pre-hole machined by the previous two-flute twist drill leads to an increase in the cutting amount during reamer machining and the inability to completely correct the hole position, directly affecting the service life and machining effect of the reamer.

[0004] (2) Existing reamers generally use relatively narrow cylindrical cutting edges to support the hole wall. However, during the machining process, as the cutting edge of the reamer wears, the support of the cutting edge to the hole wall will weaken, and affected by the vibration during machine tool machining, vibration marks and scratches will appear on the hole wall, and such problems are particularly obvious during tool withdrawal. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a combined reaming and grinding tool to solve the problems raised in the above background art.

[0006] To achieve the above purpose, a technical solution adopted by the utility model is: A combined reaming and grinding tool includes an integrated front reamer, a rear grinding tool, and a tool shank. At least three cutting edges are provided on both the front reamer and the rear grinding tool. The front reamer is provided with a cutting chamfer, and the cutting edge diameter of the cutting edge on the front reamer is smaller than the cutting edge diameter of the rear grinding tool.

[0007] Preferably, the angle of the cutting chamfer on the front reamer is 60 - 80 degrees on one side.

[0008] Preferably, the difference range between the cutting edge diameter of the cutting edge on the front reamer and the cutting edge diameter of the rear grinding tool is 0.02 - 0.04 millimeters.

[0009] Preferably, a tool changing partition groove is provided between the front reamer and the rear grinding tool. There is a guiding section at the connection of the partition groove and the rear grinding tool. The guiding section includes a guiding bevel and a transition arc.

[0010] Preferably, grinding particles with a particle size of 50-70# are attached to the guide section and the rear end grinding knife.

[0011] Preferably, the cross section of the dividing groove is an inverted triangle, the guiding bevel is a section on the bevel of the dividing groove, and the angle between the guiding bevel and the tool axis is between 15-25 degrees.

[0012] Preferably, the front end reamer and the rear end grinder are connected by V-shaped welding.

[0013] Preferably, the ratio of the rear end grinding blade diameter to the back width is 1:(0.3-0.35).

[0014] Preferably, the front cutting edge of the front reamer is a sharp-angle structure, and the front cutting edge of the rear grinding knife is an arc structure.

[0015] Preferably, the front end reamer is made of cemented carbide material, and the rear end grinding knife and the handle are made of high-speed steel material.

[0016] Beneficial effects of the utility model: The utility model can make the tool realize reaming first and then grinding in the hole, solving the problems of short reamer life and poor reaming quality caused by poor pre-hole accuracy. It reduces the precision requirements for machine tools, improves processing efficiency, reduces tool configuration, and reduces tool costs; at the same time, diamond grinding of the reamer part improves the quality of the hole wall, and the processing quality is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0019] Figure 3 It is a schematic diagram of the front end reamer of the utility model provided with a cutting chamfer;

[0020] Figure 4 yes Figure 2 Schematic diagram of the cross section of AA;

[0021] Figure 5 yes Figure 2 Schematic cross-section of the middle BB;

[0022] Figure 6 It is a schematic diagram of the front end reamer, the separation groove and the rear end grinding knife in the utility model;

[0023] In the figure: 1. front end reamer; 2. rear end grinding knife; 3. handle. DETAILED DESCRIPTION

[0024] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0025] Embodiment:

[0026] Refer to Figure 1 , a reaming and grinding integrated tool, including an integrated front reamer 1, a rear grinding tool 2 and a tool shank 3. At least three cutting edges are provided on both the front reamer 1 and the rear grinding tool 2. The front reamer 1 is provided with a cutting chamfer, and the cutting edge diameter of the cutting edge on the front reamer 1 is smaller than the cutting edge diameter of the rear grinding tool 2.

[0027] Among them, the angle of the cutting chamfer on the front reamer 1 is 60 - 80 degrees on one side, preferably 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees. This angle range makes the axial cutting force of the tool larger, and can effectively improve the problem of low comprehensive precision of the pre-hole existing after the processing of the previous two-flute twist drill.

[0028] Among them, the difference range between the cutting edge diameter of the cutting edge on the front reamer 1 and the cutting edge diameter of the rear grinding tool 2 is 0.02 - 0.04 mm, so that the grinding allowance of the diamond grinding reamer can be accurately controlled to achieve the optimal grinding state.

[0029] Among them, a tool changing separation groove is provided between the front reamer 1 and the rear grinding tool 2. There is a guiding section at the connection of the separation groove and the rear grinding tool 2. The guiding section includes a guiding bevel and a transition arc. This guiding structure can make the tool have no pointed contact with the hole wall during the axial feeding process, and smoothly transition between the two processing methods of reaming and grinding, so that the surface finish of the hole wall reaches the optimal effect.

[0030] Among them, grinding particles with a particle size of 50 - 70# are attached to both the guiding section and the rear grinding tool 2, preferably 60# particle size. The grinding particles can be diamond, etc. The diamond with this particle size will not cause tool overheating failure caused by heat accumulation during the processing due to too small particle size and poor grinding force; nor will the hole wall be too rough after grinding to fail to meet the drawing requirements due to too large particle size.

[0031] Among them, the cross-section of the separation groove is an inverted triangle, the guiding bevel is a section on the inclined side of the separation groove, and the angle between the guiding bevel and the tool axis is between 15 - 25 degrees, preferably 20 degrees.

[0032] Among them, the front reamer 1 and the rear grinding tool 2 are connected by V-shaped welding.

[0033] Among them, the ratio of the blade diameter to the back width of the rear grinding tool 2 is 1:(0.3 - 0.35), preferably 1:0.33. This design maximally retains the back width while taking chip removal into account, increases the adhesion of diamond particles, and enhances the grinding ability of the diamond grinding reamer.

[0034] Among them, the front tool face of the front reamer 1 is a sharp angle structure, and the front tool face of the rear grinding tool 2 is an arc structure. The special arc front tool face of the rear grinding tool 2 can prevent the tool from scratching the hole wall due to edge wear during rotation.

[0035] Among them, the front reamer 1 is made of cemented carbide, and the rear grinding tool 2 and the tool shank 3 are made of high-speed steel. The material selection can be common materials in the category.

[0036] Among them, the preferred choice for the tool shape is a square tool.

[0037] Working process and principle:

[0038] The utility model can enable the tool to perform reaming first and then grinding in the hole, solving problems such as poor reamer life and poor reaming quality caused by poor pre-hole accuracy. It reduces the requirement for machine tool accuracy and improves the processing efficiency at the same time.

[0039] The above are only embodiments of the utility model, and do not limit the patent scope of the utility model accordingly. Any equivalent structural transformation made by using the specification and drawings of the utility model, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the utility model.

Claims

1. A reamer-grinding tool, characterized in that: The invention comprises an integrated front end reamer (1), a rear end grinding knife (2) and a shank (3); the front end reamer (1) and the rear end grinding knife (2) are both provided with at least three cutting edges; the front end reamer (1) is provided with a cutting chamfer; and the cutting edge diameter of the front end reamer (1) is smaller than the cutting edge diameter of the rear end grinding knife (2).

2. The reamer-grinding integrated tool according to claim 1, characterized in that: The cutting chamfer angle on the front end reamer (1) is 60-80 degrees on one side.

3. The reamer-grinding integrated tool according to claim 1, characterized in that: The difference between the cutting edge diameter of the front end reamer (1) and the cutting edge diameter of the rear end grinding knife (2) is in the range of 0.02-0.04 mm.

4. The reamer-grinding integrated tool according to claim 3, characterized in that: A tool-changing separation groove is provided between the front end reamer (1) and the rear end grinding knife (2), and a guide section is provided at the connection between the separation groove and the rear end grinding knife (2), wherein the guide section comprises a guide bevel and a transition arc.

5. The reamer-grinding integrated tool according to claim 4, characterized in that: Grinding particles with a particle size of 50-70# are attached to the guide section and the rear end grinding knife (2).

6. The reamer-grinding integrated tool according to claim 4, characterized in that: The cross section of the separation groove is an inverted triangle, the guiding bevel is a section of the bevel of the separation groove, and the angle between the guiding bevel and the tool axis is between 15 and 25 degrees.

7. The reamer-grinding integrated tool according to claim 1, characterized in that: The front end reamer (1) and the rear end grinding knife (2) are connected by V-shaped welding.

8. The reamer-grinding integrated tool according to claim 1, characterized in that: The ratio of the blade diameter of the rear end grinding knife (2) to the back width is 1:(0.3-0.35).

9. The reamer-grinding integrated tool according to claim 1, characterized in that: The front cutting edge of the front reamer (1) is a sharp-angle structure, and the front cutting edge of the rear grinding knife (2) is an arc structure.

10. The reamer-grinding integrated tool according to claim 1, characterized in that: The front end reamer (1) is made of hard alloy material, and the rear end grinding knife (2) and the handle (3) are made of high-speed steel material.

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