Hard alloy end mill for finish machining of quenched steel

Abstract

The utility model relates to a hard alloy end milling cutter for finish machining of quenched steel in the technical field of metal processing, which is characterized in that a bottom blade component for processing metal is fixedly mounted at the left end of a cutter handle, and a spiral circumferential blade component for cutting is arranged on a rod body of the cutter handle; a spiral groove used for chip removal is formed between every two adjacent spiral circumferential blade assemblies. The number of the spiral grooves in each pair is two, and the two spiral grooves are both distributed in the outer wall of the tool bit in a spiral shape. The spiral angle comprises a deep groove and a low groove, and the deep groove is located on the left side of the low groove. Therefore, the vibration of the cutter in the cutting process is reduced by adopting the structure with the unequal teeth and the unequal helical angles, the strength of the cutting edge is improved by the proper front angle and the proper rear angle, the normal chip removal is ensured by the front and rear unequal core diameters, and the rigidity and the strength of the cutter are improved, so that the cutter can be prevented from cracking and being worn too fast after cutting, machining and quenching, and the service life of the cutter is prolonged. And the service life of the cutter is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal processing technical field especially is related to a kind of hard alloy end mill for quenching steel finish machining. BACKGROUND

[0002] Hard alloy end mill is generally mainly installed in numerical control machining center, in metal processing, generally cutting is carried out before heat treatment, but for some high-precision dimensions, heat before processing will appear certain degree of deformation after heat treatment. For example, as shown in a kind of hard alloy end mill in Chinese patent application No. CN201720630097.3, including handle, the cutter head connected to handle, 4 spiral blades and cooling liquid passage arranged on the side wall of cutter head;Cutter head is conical structure, 4 spiral blades are evenly distributed on the side wall of cutter head, spiral blade extends from the thick end of cutter head to the tip of cutter head and is connected at the tip of cutter head;The end of handle away from cutter head is provided with large clamping plate, the bottom of large clamping plate is connected with clamping rod, and the bottom of clamping rod is connected with lower clamping plate.

[0003] However, when using hard alloy end mill to process metal, generally cutting is carried out before heat treatment, but for some high-precision dimensions, heat before processing will appear certain degree of deformation after heat treatment, so that the size cannot meet the requirements of drawing, in this case, the end mill that can finish machining is needed to carry out heat after processing for workpiece, at this time, the hardness of part is about 50~60HRC, and using our general whole hard alloy end mill milling will cause tool to be extremely easy to wear and collapse, and the service life is very low, and the processing efficiency is very low. SUMMARY

[0004] Therefore, the utility model provides a kind of hard alloy end mill for quenching steel finish machining, solves the problem that whole hard alloy end mill milling will cause tool to be extremely easy to wear and collapse, and the service life is very low, and the processing efficiency is very low.

[0005] The technical scheme adopted by the utility model is: a kind of hard alloy end mill for quenching steel finish machining, including handle, the left end of handle is fixedly installed with cutter head, the left end of cutter head is processed with bottom blade component for processing metal, the rod body of cutter head is provided with spiral peripheral blade component for cutting processing, and adjacent two spiral peripheral blade components are provided with spiral groove for chip removal.

[0006] The spiral groove has two pairs, and each pair of spiral groove is provided with two, and the two spiral grooves are distributed in the outer wall of cutter head in spiral shape, the two pairs of teeth of the spiral groove of spiral peripheral blade are 38°~40°, the other two pairs of teeth spiral groove are 40°~42°, and the two pairs of spiral grooves are oppositely distributed, so as to discharge the iron filings generated by cutting metal workpiece by four spiral peripheral blades and bottom blade.

[0007] The spiral groove comprises a deep groove and a low groove, the deep groove is located at the left side of the low groove, the groove depth of the deep groove is greater than that of the low groove, the core diameter of the deep groove is 0.6 times of the outer diameter of the tool, and the core diameter of the low groove is 0.8 times of the outer diameter of the tool, so that the tool vibration in the cutting process is reduced by using the unequal tooth and unequal spiral angle structure, the strength of the cutting edge is improved by the proper rake angle and relief angle, the core diameters of the front and rear are not equal, the normal chip removal is ensured, and the rigidity and strength of the tool are improved, so that the tool bounce is reduced when cutting the quenched steel, the tool wears too fast is reduced, and the machining efficiency and tool life are improved.

[0008] Further, the bottom edge assembly comprises four bottom edges arranged at the left end of the tool head.

[0009] Further, the included angles among the four bottom edges are staggered and equal to each other, the included angles among the four bottom edges are 84°-86°, 94°-96° respectively, the four bottom edges are staggered and equal to each other, and the four bottom edges adopt the structure of the conical tool head, so that the four bottom edges are convenient for cutting the metal.

[0010] Further, the spiral peripheral edge assembly comprises four spiral peripheral edges arranged on the rod body of the tool head.

[0011] Further, the spiral angles between the two adjacent spiral peripheral edges are the same, the included angles of each pair of spiral angles formed between the two adjacent spiral peripheral edges are the same, the normal rake angle of the spiral peripheral edge is 3°-5°, the negative rake angle with the width of 0.5-0.8 is made at the tool tip close to the four bottom edges, and the negative rake angle is 14°-16°, the two negative rake angles are staggered and distributed, the normal relief angle of the spiral peripheral edge is 10°-14°, so that the four spiral peripheral edges and the bottom edges are convenient for cutting the metal workpiece.

[0012] The utility model discloses the beneficial effect is: through setting bottom edge assembly, spiral peripheral edge assembly and spiral angle,

[0013] 1, using unequal tooth, unequal spiral groove structure reduces the tool vibration in the cutting process, and the matching of proper rake angle, relief angle and spiral groove can reduce the cutting resistance while guaranteeing the strength of the cutting edge and the tool tip,

[0014] 2, using unequal core diameter improves the rigidity of the tool, and increases the tool strength,

[0015] 3, on the basis of the positive rake angle of the peripheral edge rake face, a certain length of negative rake angle is added, the strength of the cutting edge is increased, and the cutting edge wear failure is delayed.

[0016] Compared with the prior art, the utility model greatly guarantees the strength of the cutter, prolongs the service life of the cutter, and thus achieves the purpose of meeting the efficient cutting to the maximum extent. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the utility model;

[0018] Figure 2 It is a left view of the utility model;

[0019] Figure 3 It is a whole structure schematic view of the utility model Figure 1 It is a sectional view along A-A direction of the utility model;

[0020] Figure 4 It is a whole structure schematic view of the utility model Figure 1 It is a sectional view along B-B direction of the utility model;

[0021] Figure 5 It is a whole structure schematic view of the utility model Figure 1 It is a sectional view along C-C direction of the utility model.

[0022] In the drawing: 100, bottom blade assembly, 101, bottom blade; 200, spiral peripheral edge assembly, 201, spiral peripheral edge; 300, handle; 400, spiral groove, 401, deep groove, 402, low groove; 500, tool bit. DETAILED DESCRIPTION

[0023] In order to make the skilled in the art better understand the technical scheme of the utility model, the utility model is further explained in detail below in combination with the drawings and specific embodiments.

[0024] As Figures 1-5 shown, the utility model provides a kind of hard alloy end mill for quenching steel finishing.

[0025] Including handle 300, the left end of handle 300 is fixedly installed with tool bit 500, and tool bit 500 left end is processed with the bottom blade assembly 100 for processing metal, and the rod body of tool bit 500 is opened with the spiral peripheral edge assembly 200 for cutting processing, and adjacent two described spiral peripheral edge assembly 200 between being provided with the spiral groove 400 for chip removal.

[0026] Bottom blade assembly 100 includes the bottom blade 101 being arranged in the left end of tool bit 500, and bottom blade 101 has four, four bottom blade 101 is distributed in the left end of tool bit 500 in circumferential array, the included angle between four bottom blade 101 is 84 ° ~ 86 °, 94 ° ~ 96 ° respectively, mutually staggered, equal to groove, and four bottom blade 101 adopt the structure of conical tool bit, to facilitate using four bottom blade 101 fast cutting processing of metal.

[0027] The helical peripheral edge assembly 200 comprises helical peripheral edges 201 opened on the tool head 500 for cutting, and the helical peripheral edges 201 are four, the four helical peripheral edges 201 are distributed in a circumferential array on the shank of the tool head 500, and the included angle of each pair of helical grooves 400 formed between adjacent two helical peripheral edges 201 is the same; the normal rake angle of the helical peripheral edge 201 is 3°-5°, a negative rake angle with a width 7 of 0.5-0.8 is made at the tool tip close to the four bottom edges 101, and a negative rake angle of 14°-16°, the two negative rake angles are staggered; the normal relief angle of the helical peripheral edge 201 is 10°-14°, so as to facilitate the cutting of the metal workpiece by the four helical peripheral edges 201 and the bottom edges 101.

[0028] The helical groove 400 has two pairs, and each pair of helical grooves 400 is provided with two, the two helical grooves 400 are distributed in a helical shape on the outer wall of the tool head 500, and the included angle of each pair of helical grooves 400 is the same, the two pairs of teeth of the helical groove 400 of the helical peripheral edge 201 are 38°-40°, the other two pairs of teeth of the helical groove 400 are 40°-42°, and the two pairs of helical grooves 400 are oppositely distributed, so as to facilitate the discharge of iron filings generated by the cutting of the metal workpiece by the four helical peripheral edges 201 and the bottom edges 101.

[0029] The helical groove 400 comprises a deep groove 401 and a low groove 402, and the deep groove 401 is located on the left side of the low groove 402, and the groove depth of the deep groove 401 is greater than that of the low groove 402. On the whole edge length, the front and rear core diameters of the deep groove 401 and the low groove 402 are not equal, the core diameter of the deep groove 401 is 0.6 times the outer diameter of the tool, and the core diameter of the low groove 402 is 0.8 times the outer diameter of the tool. Therefore, the use of unequal tooth and unequal helical groove structure reduces the vibration of the tool in the cutting process, the appropriate rake angle and relief angle improve the strength of the cutting edge, and the unequal core diameters in front and back not only ensure normal chip removal, but also improve the rigidity and strength of the tool, so that the tool can reduce the tool bounce when cutting the quenched steel parts, the wear is too fast, the machining efficiency and tool life are improved.

Claims

1. A hard metal end mill for finish machining of quenched steel comprising a shank (300), characterized in that: The left end of the tool holder (300) is fixedly provided with a tool head (500), the left end of the tool head (500) is provided with a bottom blade assembly (100) for machining metal, the shank of the tool head (500) is provided with a spiral peripheral blade assembly (200) for cutting, and adjacent two spiral peripheral blade assemblies (200) are provided with a spiral groove (400) for chip removal. The spiral groove (400) has two pairs, each pair of spiral grooves (400) is provided with two, and the two spiral grooves (400) are distributed in a spiral manner on the outer wall of the tool head (500). The spiral groove (400) comprises a deep groove (401) and a low groove (402), the deep groove (401) is located on the left side of the low groove (402), and the groove depth of the deep groove (401) is greater than that of the low groove (402).

2. A hard metal end mill for finishing quenched steel according to claim 1, characterized in that: The bottom blade assembly (100) comprises a bottom blade (101) provided on the left end of the tool head (500), the bottom blade (101) has four, and the four bottom blades (101) are distributed in a circumferential array on the left end of the tool head (500).

3. A hard metal end mill for finishing quenched steel according to claim 2, characterized in that: The included angles between the four bottom blades (101) are staggered and equal to the groove.

4. A hard metal end mill for finishing quenched steel according to claim 1, characterized in that: The spiral peripheral blade assembly (200) comprises a spiral peripheral blade (201) provided on the tool head (500) for cutting, and the spiral peripheral blade (201) has four, and the four spiral peripheral blades (201) are distributed in a circumferential array on the shank of the tool head (500).

5. A hard metal straight end mill for finishing quenched steel according to claim 4, characterized in that: The spiral angles between adjacent two spiral peripheral blades (201) are equal.

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