Cutter with variable margin width

Abstract

The utility model discloses a variable margin width cutter which comprises a cutter body, a plurality of blade teeth are arranged on the cutter body, and the margin widths of the blade teeth are sequentially decreased or sequentially increased or sequentially decreased and then sequentially increased. According to the utility model, on the basis of keeping the original mode of'replacing milling by grinding 'and solving the problem of a transverse line along the machining direction, a mode of continuously changing the width of the edge belt is adopted to generate continuously changing cutting force, so that the average cutting force of the cutter when passing through the through hole is reduced, and the problem of concave extrusion lines at the edge of the through hole is solved; the problem of concave extrusion lines along a transverse line in the machining direction and at the edge position of the through hole can be solved simultaneously.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to a tool with variable blade width. Background Art

[0002] When processing thin-walled parts with through holes, in order to reduce processing costs, it is usually necessary to produce the blank of the thin-walled parts with through holes in one step. For the processing of such thin-walled parts, the tool needs to pass through an area with poor rigidity (through hole area). If the cutting force of the tool is too large when passing through this area, it will leave an obvious concave extrusion line at the edge of the through hole. At present, the commonly used processing method is to use ordinary milling cutters to process thin-walled parts with through holes. Since ordinary milling cutters are relatively sharp (such as Figure 1 As shown in the figure, there is no edge band, and the through hole area can be passed with a smaller cutting force without producing a concave extrusion line, but there will be obvious horizontal lines along the processing direction, such as Figure 2 In order to solve the problem of horizontal lines along the machining direction, a common method is to set a margin at the cutting edge of the tool (such as Figure 3 As shown in the figure, the problem is solved by "grinding instead of milling". However, the cutting edge of the tool with a margin at the cutting edge will squeeze the workpiece surface during the machining process, resulting in excessive cutting force, which will cause an obvious concave extrusion line at the edge of the through hole, as shown in the figure below. Figure 4 shown. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a tool with a variable blade width, which can simultaneously solve the problems of the horizontal lines appearing along the processing direction and the concave extrusion lines generated at the edge of the through hole.

[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0005] A tool with variable blade width comprises a tool body. The tool body is provided with a plurality of blade teeth, and the blade widths of the blade teeth decrease or increase in sequence or decrease and then increase in sequence.

[0006] The land width of the cutting edge satisfies the formula:

[0007] L x =a0+a1x+.....+a m x m

[0008] Wherein, x is the ordinal number of the blade teeth, which is a positive integer from 1 to n, and n is the number of blade teeth provided on the tool body;

[0009] L x is the width of the margin of the Xth tooth;

[0010] a0、a1、....、a m is a constant, a0 is a positive number, a1, ..., a m Independently positive or negative;

[0011] m is the order, which is a positive number ranging from 1 to 10.

[0012] Specifically, when m is 1, the width of the blade edge satisfies the formula: L x =a0+a1x, then L1=a0+a1, L2=a0+2a1, L3=a0+3a1, .....L n =a0+na1. When a0 is a positive number and a1 is a negative number, then L x It decreases linearly with the increase of the tooth number. When a1 is a positive number, L x It increases linearly with the increase of the tooth number.

[0013] When m is 2, the width of the blade edge satisfies the formula: L x =a0+a1x+a2x 2 , then L1=a0+a1+a2, L2=a0+2a1+2 2 a2,L3=a0+3a1+3 2 a2, .....L n =a0+2a1+n 2 a2.

[0014] When m is 3, the width of the blade edge satisfies the formula: L x =a0+a1x+a2x 2 +a3x 3 , then L1=a0+a1+a2+a3, L2=a0+2a1+2 2 a2+2 3 a3, L3 = a0 + 3a1 + 3 2 a2+3 3 a3,.....

[0015] L n =a0+2a1+n 2 a2+n 3 a3.

[0016] The number of the blade teeth is 10 to 200. Exemplarily, the number of the blade teeth is 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, or 200.

[0017] The width of the blade edge of the blade teeth is 0.001 mm to 1 mm.

[0018] The front angle of each of the cutting teeth is the same, and the front angle of each cutting tooth is -30° to 20°.

[0019] The back angle of each of the blade teeth is the same, and the back angle of the blade teeth is 0° to 90°.

[0020] The front angle of the cutting teeth changes with the width of the cutting edge.

[0021] The front angle of the blade teeth is -50° to 40°.

[0022] The back angle of the cutting teeth varies with the width of the cutting edge.

[0023] The back angle of the blade teeth is 0° to 90°.

[0024] Compared with the prior art, the beneficial effect of the utility model is that: while retaining the original method of "grinding instead of milling" to solve the problem of horizontal lines along the machining direction, the utility model adopts the form of continuously changing blade width to generate continuously changing cutting force, so that the average cutting force of the tool when passing through the through hole position is reduced, thereby solving the problem of concave extrusion lines at the edge of the through hole, and can simultaneously solve the problems of horizontal lines appearing along the machining direction and concave extrusion lines generated at the edge of the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a schematic diagram of the tooth structure of a common milling cutter in the prior art.

[0026] Attached Figure 2 Is the use of attached Figure 1 Schematic diagram of the horizontal line structure along the machining direction generated by ordinary milling cutter machining.

[0027] Attached Figure 3 It is a schematic diagram of the blade tooth structure with a blade band in the prior art.

[0028] Attached Figure 4 Use attached Figure 3 Schematic diagram of the structure of the extrusion line with a significant depression at the edge of the through hole produced when the cutting teeth of the cutting band are set in the middle.

[0029] Attached Figure 5 It is a structural schematic diagram of the utility model.

[0030] Attached Figure 6 It is a schematic diagram of the blade tooth structure of the utility model.

[0031] Attached Figure 7 It is a schematic diagram showing that the width of the blade band of the blade teeth of the utility model is in a linear decreasing relationship.

[0032] Attached Figure 8It is a schematic diagram showing that the width of the blade band of the blade teeth of the utility model is in a decreasing curve relationship.

[0033] Attached Fig. 9 It is a schematic diagram showing that the width of the blade band of the blade teeth of the utility model first decreases and then increases.

[0034] Attached Fig.10 It is a schematic diagram of blade tooth parameters.

[0035] Attached Fig.11 It is a schematic diagram of blade tooth structure with different variations. DETAILED DESCRIPTION

[0036] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the present application.

[0037] A tool with variable blade width comprises a tool body 1. A plurality of blade teeth 2 are arranged on the tool body 1. The blade widths of the blade teeth 2 decrease or increase in sequence or decrease and then increase in sequence.

[0038] Further, an implementation method of the change of the edge width of the blade tooth 2: the edge width of the blade tooth 2 can be decayed or increased in a form of decreasing or increasing in sequence according to a polynomial curve equation. Assuming that the number of blade teeth arranged on the tool body is n, L1 is the maximum value or minimum value of the edge width on all blade teeth 2, and the edge width of the blade tooth satisfies the formula:

[0039] L x =a0+a1x+.....+a m x m

[0040] Wherein, x is the ordinal number of the blade teeth, which is a positive integer from 1 to n, and n is the number of blade teeth provided on the tool body;

[0041] L x is the width of the margin of the Xth tooth;

[0042] a0、a1、....、a m is a constant, a0 is a positive number, a1, ..., a m Independently positive or negative;

[0043] m is the order, which is a positive number ranging from 1 to 10.

[0044] If L1 is the minimum value of the width of the edge band on all the edge teeth 2, the edge teeth along the circumference of the tool body 1 in the clockwise or counterclockwise direction are defined as L1, L2, L3, ..., L n , there is a relation L1 <L2<L3<......<L n ; If L1 is the maximum value of the width of the edge band on all teeth 2, there is a relationship L1>L2>L3>......>L n .

[0045] Specifically, when m is 1, the width of the blade edge satisfies the formula: L x =a0+a1x, then L1=a0+a1, L2=a0+2a1, L3=a0+3a1, .....L n =a0+na1. When a1 is a negative number, L x As the number of teeth increases, it decreases linearly. Figure 7 As shown; when a1 is a positive number, L x As the number of teeth increases, it increases linearly. In this embodiment, the values ​​of a0 and a1 can be: a0 = 0.055-0.065, a1 = -4.0*10 -4 ~-6.0*10 -4 .

[0046] When m is 2, the width of the blade edge satisfies the formula: L x =a0+a1x+a2x 2 , is the second-order attenuation (such as Figure 8 As shown) or increasing, then L1=a0+a1+a2, L2=a0+2a1+2 2 a2,L3=a0+3a1+3 2 a2,.....,L n =a0+2a1+n 2 In this embodiment, the values ​​of a0, a1, and a2 may be: a0 = 0.055 to 0.065, a1 = -8.5*10 -4 ~-1.0*10 -3 , a2=7.0*10 -6 ~9.0*10 -6 .

[0047] When m is 3, the width of the blade edge satisfies the formula: L x =a0+a1x+a2x 2 +a3x 3 , then L1=a0+a1+a2+a3, L2=a0+2a1+2 2 a2+2 3 a3, L3 = a0 + 3a1 + 32 a2+3 3 a3,.....,L n =a0+2a1+n 2 a2+n 3 In this embodiment, the values ​​of a0, a1, a2, and a3 may be: a0 = 0.055 to 0.065, a1 = -0.0005 to -0.002, a2 ​​= 1.5*10 -5 ~2.5*10 -5 , a3=-1.0*10 -7 ~-2.0*10 -7 .

[0048] Another embodiment of the variation of the width of the blade edge of the blade tooth 2 is as follows: Fig. 9 As shown, the width of the blade band of the blade tooth 2 decreases and then increases successively.

[0049] Furthermore, the number of the blade teeth is 10 to 200. Exemplarily, the number of the blade teeth is 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, or 200.

[0050] Furthermore, the width of the blade edge of the blade teeth is 0.001 mm to 1 mm.

[0051] As attached Fig.10 As shown, the edge shape of the blade tooth 2 consists of three parts, including the width of the blade, the front angle and the back angle. When the angle of the front angle is located to the right of the vertical line, it is a positive front angle (+), and when it is located to the left of the vertical line, it is a negative front angle (-).

[0052] Furthermore, on the same tool, the rake angle of each of the cutting teeth 2 is the same, and the rake angle of the cutting teeth 2 is -30° to 20°, which can be -30°, -25°, -20°, -15°, -10°, 0°, 10°, 15°, or 20°.

[0053] Furthermore, on the same tool, the back angle of each of the cutting teeth 2 is the same, and the back angle of the cutting teeth 2 is 0° to 90°, and can be 10°, 20°, 30°, 45°, 50°, 60°, 70°, or 80°.

[0054] Furthermore, on the same tool, the rake angle of the cutting tooth 2 changes with the change of the width of the cutting edge, and the rake angle of the cutting tooth 2 changes in the range of -50° to 40°.

[0055] Furthermore, on the same tool, the back angle of the cutting tooth 2 changes with the change of the edge band width, and the range of the back angle of the cutting tooth 2 is 0° to 90°.

[0056] Specifically, as attached Fig.11 As shown, there are three situations:

[0057] Case 1: On the same tool, the back angle of each of the cutting teeth 2 is the same, and the back angle of the cutting teeth can be any value within the range of 0° to 90°. The front angle of the cutting teeth 2 changes with the change of the blade width, and the range of the front angle of the cutting teeth is within the range of -50° to 40°.

[0058] Case 2: On the same tool, the rake angle of each of the cutting teeth 2 is the same, and the rake angle of the cutting teeth can be any value within the range of -30° to 20°. The back angle of the cutting teeth 2 changes with the change of the blade width, and the range of the back angle of the cutting teeth is within the range of 0° to 90°.

[0059] Case 3: On the same tool, the rake angle and the back angle of the cutting tooth 2 change with the change of the blade width. The rake angle of the cutting tooth changes in the range of -50° to 40°, and the back angle of the cutting tooth changes in the range of 0° to 90°.

Claims

1. A tool with variable blade width, comprising a tool body, characterized in that: A plurality of blade teeth are arranged on the tool body, and the width of the blade bands of the blade teeth decreases in sequence or increases in sequence or decreases in sequence and then increases in sequence.

2. A tool with variable blade width according to claim 1, characterized in that: The land width of the cutting edge satisfies the formula: L x =a0+a1x+.....+a m x m Wherein, x is the ordinal number of the blade teeth, which is a positive integer from 1 to n, and n is the number of blade teeth provided on the tool body; L x is the width of the margin of the Xth tooth; a0、a1、....、a m is a constant, a0 is a positive number, a1, ..., a m Independently positive or negative; m is the order, which is a positive number ranging from 1 to 10.

3. A tool with variable blade width according to claim 1, characterized in that: The number of the blade teeth is 10 to 200.

4. A tool with variable blade width according to claim 1, characterized in that: The width of the blade edge of the blade teeth is 0.001 mm to 1 mm.

5. The tool with variable blade width according to claim 1, characterized in that: The front angle of each of the cutting teeth is the same, and the front angle of each cutting tooth is -30° to 20°.

6. The tool with variable blade width according to claim 1, characterized in that: The back angle of each of the blade teeth is the same, and the back angle of the blade teeth is 0° to 90°.

7. The tool with variable blade width according to claim 1, characterized in that: The front angle of the cutting teeth changes with the width of the cutting edge.

8. A tool with variable blade width according to claim 7, characterized in that: The front angle of the blade teeth is -50° to 40°.

9. The tool with variable blade width according to claim 1, characterized in that: The back angle of the cutting teeth varies with the width of the cutting edge.

10. A tool with variable blade width according to claim 9, characterized in that: The back angle of the blade teeth is 0° to 90°.

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