Welded corrugated milling cutter special for machining narrow curved deep groove of ultrahigh-strength steel

Abstract

The utility model discloses a welding type corrugated milling cutter special for machining an ultra-high-strength steel narrow curve-shaped deep groove, and belongs to the technical field of machining. The cutter comprises a cutting part, a reinforcing rod part and a cutter handle part, the reinforcing rod part is located between the cutting part and the cutter handle part, the cutting part is fixedly connected to one side of the reinforcing rod part, and the cutter handle part is fixed to the other side of the reinforcing rod part; the reinforcing rod part and the cutter handle part are of an integrated structure and are made of 50 # steel, and the cutting part is made of W2Mo9Cr4VCo8. Cutting edges and chip flutes are arranged in the circumferential direction of the cutting part, the cutting edges and the chip flutes are arranged in a staggered mode in the circumferential direction of the cutting part, and the cutting edges are in a sine curve shape; the sine-curve-shaped cutting edge is provided with wave crests and wave troughs, and the wave crests and the wave troughs change periodically. According to the utility model, the rough machining time of the waist groove can be effectively shortened, and the machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a special welded corrugated milling cutter for processing ultra-high strength steel narrow curved deep grooves, belonging to the technical field of mechanical processing. Background Art

[0002] There is a large artillery part with a cubic shape, which has a square hole (through) in the middle of the upper surface, and a narrow curved deep groove structure with a coaxial line symmetrically on the left and right sides (as shown in the attached figure). Figures 4 to 7 ), commonly known as the waist groove, is made of a unique material that is difficult to machine. This material belongs to the ultra-high-strength alloy steel series, which has high strength and sufficient toughness. However, this material is hard, rough, and sticky, which reduces machinability and greatly increases machining difficulty.

[0003] The waist groove had previously been machined on a conventional vertical milling machine using a guide milling cutter, following the inside of a dedicated guide, to machine arcs and curves. Over time, this quality became unstable, with issues such as out-of-tolerance and tool damage. This was attributed to factors such as declining machine tool accuracy, the wear of the dedicated guide, and the high labor intensity and fatigue of workers. Therefore, innovations in CNC technology were implemented for waist groove machining to improve quality consistency. A Sandvik vibration-proof milling cutter with a diameter of φ25 and an effective cutting length of 145mm was purchased from the machining center for rough milling. A layer milling approach was used, with each layer engaging 0.5mm, to achieve the desired groove dimensions. However, the long cutting time prevented high-quality and efficient CNC machining. This was due to the high hardness of the part material and the narrow and deep waist groove. The milling cutter required for this process was thin and long, resulting in high cutting resistance and high vibration, which could easily cause blade damage. Even with a vibration-proof cutter, only layer milling was required, with small cuts per layer, resulting in long machining times. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the utility model provides a special welded corrugated milling cutter for processing narrow curved deep grooves in ultra-high strength steel. The device is a special corrugated milling cutter designed for rough milling of narrow curved deep groove structures in the parts of a certain artillery model product. It is used for rough milling waist grooves, which can effectively shorten the rough processing time of waist grooves and improve processing efficiency.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a special welded corrugated milling cutter for processing narrow curved deep grooves in ultra-high strength steel, comprising a cutting part, a reinforcing rod part and a shank part, the reinforcing rod part being located between the cutting part and the shank part, the cutting part being fixedly connected to one side of the reinforcing rod part, and the shank part being fixed to the other side of the reinforcing rod part; cutting edges and chip grooves are provided in the circumferential direction of the cutting part, the number of the cutting edges and the number of the chip grooves are both four, the cutting edges and the chip grooves are staggered in the circumferential direction of the cutting part, and the cutting edges are in the shape of a sine curve.

[0006] Furthermore, the sinusoidal cutting edge is provided with crests and troughs, and the crests and troughs vary periodically.

[0007] Furthermore, the material of the cutting part is W2Mo9Cr4VCo8.

[0008] Furthermore, the reinforcing rod part and the handle part are an integrated structure and are made of No. 50 steel.

[0009] The beneficial effect of the utility model is that the utility model can directly drop the tool to a depth of 143mm from the tool drop hole to mill the slot through. Compared with the original processing method of using a shock-proof milling cutter for layer milling (the cutting depth of each layer is 0.5mm), the rough milling processing time is effectively shortened, the processing efficiency is improved, and the waist slot processing is successfully completed on the machining center XH7610 / 3, getting rid of the original ordinary vertical milling relying on the template processing method. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0011] Figure 1 It is a structural diagram of the present utility model.

[0012] Figure 2 It is a sinusoidal wave cross-sectional view of the cutting edge of the present invention.

[0013] Figure 3 yes Figure 1 Schematic diagram of the A-A section of the middle cutting edge.

[0014] Figure 4 It is a schematic diagram of the left side of the workpiece.

[0015] Figure 5 yes Figure 4 An enlarged schematic diagram of the left lumbar groove at point I.

[0016] Figure 6 yes Figure 5 Schematic diagram of the S-S section of the waist groove on the left side of the workpiece.

[0017] Figure 7 It is a top view of the workpiece.

[0018] Figure 8 It is a schematic diagram of the right side of the workpiece.

[0019] Figure 9 yes Figure 8 An enlarged schematic diagram of the right lumbar groove at center II.

[0020] Figure 10 yes Figure 9Schematic diagram of the T-T section of the waist groove on the right side of the workpiece.

[0021] Figure 11 This is the right view of the workpiece after step 2 processing is completed.

[0022] Figure 12 yes Figure 11 R-R direction schematic diagram.

[0023] Figure 13 It is a diameter dimension design drawing of the reinforcing rod part of the present utility model.

[0024] Figure 14 yes Figure 13 N-N direction schematic diagram of the utility model when working.

[0025] Numbers in the figure:

[0026] 1. Cutting part, 101. Cutting edge, 102. Chip groove, 103. Wave crest, 104. Wave trough, 2. Reinforcement rod part, 3. Tool holder part, 4. Left side of workpiece, 5. Upper surface of workpiece, 6. Right side of workpiece, 7. Left waist groove, 8. Right waist groove, 9. Center trajectory of left waist groove, 10. Center trajectory of right waist groove, 11. Square hole, 12. Middle point of center trajectory of right waist groove. DETAILED DESCRIPTION

[0027] like Figure 1 As shown in FIG14 , a special welded corrugated milling cutter for processing narrow curved deep grooves of ultra-high strength steel comprises a cutting part 1, a reinforcing rod part 2 and a shank part 3, wherein the reinforcing rod part 2 is located between the cutting part 1 and the shank part 3, the cutting part 1 is fixedly connected to one side of the reinforcing rod part 2, and the shank part 3 is fixed to the other side of the reinforcing rod part 2; the reinforcing rod part 2 and the shank part 3 are an integral structure, the material of which is No. 50 steel, and the material of the cutting part 1 is W2Mo9Cr4VCo8; a cutting edge 101 and a chip groove 102 are provided in the circumferential direction of the cutting part 1, and the number of the cutting edge 101 and the chip groove 102 are both four, and the cutting edge 101 and the chip groove 102 are staggered in the circumferential direction of the cutting part 1, and the cutting edge 101 is sinusoidal; the sinusoidal cutting edge 101 is provided with a crest 103 and a trough 104, and the crest 103 and the trough 104 change periodically.

[0028] The size of the waist groove to be processed is 30H10 in width and 140 in depth (through groove). The length-to-diameter ratio of the milling cutter required for processing the waist groove is 152 / 27≈5.63, and a better tool material is required.

[0029] The length L of the selected corrugation of the tool is 4 mm, the depth H is 1.2 mm, and the sine wave cross section of the cutting edge 101 is shown in the attached figure. Figure 2The cutting edge is spirally distributed on the outer circumference of the cutting part 1, that is, the first wave crest 103 is the second wave crest 103 after one rotation (similar to a thread), so that each wave crest 103 on the cutting edge participates in milling the workpiece surface at the same time when the milling cutter rotates. In this way, a corrugated circular groove will be milled on the machined surface when the milling cutter rotates. Through calculation, the required helix angle θ=2°42′.

[0030] During processing, first process the outer 40mm×79.5mm and 100mm deep groove of the waist groove, and then process the inner 30mm wide curved groove. The diameter of the reinforcing rod part 2 is as shown in the attached figure. Figure 14 The distance between the midpoint 12 of the center trajectory of the right waist groove and the edge of the 40mm wide groove is 18.37mm, and the diameter of the reinforcing rod part 2 is φ32mm. At this time, the gap between the reinforcing rod part 2 and the side wall of the 40mm wide groove is 2.37mm. The reinforcing rod part 2 not only increases the strength of the milling cutter, but also leaves enough space for chip removal.

[0031] Processing process:

[0032] First, install the workpiece on the workbench of the machining center, align and clamp it, and then complete the processing through the following steps:

[0033] Step 1: Drill and fine-bored 2×φ30H10 holes at coordinates A-B and C-D on the left side 4 of the workpiece, and reach the square hole 11 (depth 140mm) on the upper surface 5 of the workpiece; then rotate the worktable 180°, and drill and fine-bored 2×φ30H10 holes at coordinates A-B and C-D on the right side 6 of the workpiece, and reach the square hole 11 (depth 140mm) on the upper surface 5 of the workpiece.

[0034] Step 2: Mill the right side groove of the workpiece 6 with a size of 40×79.5 and a depth of 100mm; then rotate the worktable 180° and mill the left side groove of the workpiece 4 (symmetrical on both sides); after this step is completed, the workpiece will be as shown in the attached figure. Figure 11 —12 (taking the right slot as an example).

[0035] Step 3: Using the present invention, rough mill the left waist groove 7 on the left side 4 of the workpiece; then rotate the worktable 180 degrees and rough mill the right waist groove 8 on the right side 6 of the workpiece (see Figure 13 ).

[0036] Step 4: Finish milling the right waist groove 8, then rotate the worktable 180° and finish milling the left waist groove 7.

[0037] Among them, in the second step, the specific application method of the utility model is to install the utility model on the horizontal machining center, on the left side of the workpiece 4, from the coordinate A-B has been processed φ30H10 hole drop depth 143mm, programming to walk circular interpolation, according to the left waist groove center trajectory 9 processing, go to the coordinate C-D, the left waist groove 7 milling; then rotate the worktable 180 °, on the right side of the workpiece 6, according to the same method, according to the right waist groove center trajectory 10 processing, the right waist groove 8 milling.

[0038] Taking the right waist groove 8 as an example, during the machining process along the center trajectory 10 of the right waist groove, a macro program is used for programming, which controls each cutting motion of 1 mm and idling for 4 turns. The purpose of idling is to discharge the processed iron chips in time through the chip groove 102. Because during the trial cutting, continuous cutting has caused the tool body to break (knife hitting) phenomenon. The reasons are analyzed as follows: first, the coolant cannot be poured into the deeper part of the groove, and the iron chips are not easy to be discharged, resulting in knife hitting; second, because the workpiece material is hard, the cutting resistance and vibration of the tool are large. After the program is improved to a macro program, the utility model is applied, and a reasonable rotation speed and cutting speed are adopted, the cutting is stable, and the knife hitting phenomenon no longer occurs. It has been applied in the mass production of this part, and the cutting is stable and reliable. It is used for rough milling waist grooves, and its machining efficiency is high and the tool life is long.

[0039] The material of the cutting part 1 is W2Mo9Cr4VCo8, which is a tungsten-molybdenum-based high-carbon cobalt-containing super-hard high-speed steel. It is suitable for making various high-precision complex tools, such as forming milling cutters, precision broaches, etc., and can also be used as various high-hardness tool heads and blades. It has the advantages of high room temperature hardness (up to 70HRC) and high temperature hardness, high red hardness, easy grinding, and sharpness. In view of the material of ultra-high strength steel workpieces, the material of the selected tool cutting part has high hardness and high wear resistance, sufficient strength and toughness, can resist vibration during cutting, has good cutting stability, and strong tool durability.

[0040] The reinforcing rod part 2 and the shank part 3 are an integral structure made of No. 50 steel. It is a universal tool cone selected based on the diameter size, cutting stability, etc. of the tool. It is simple to manufacture, low in cost, and highly versatile. It can be clamped in machining centers and ordinary milling machines; the cutting part 1 is welded together with the reinforcing rod part 2 and the shank part 3, which is beneficial to saving tool material in the cutting part.

Claims

1. A welded corrugated milling cutter specially designed for machining ultra-high strength steel narrow curved deep grooves, characterized by: The invention comprises a cutting portion (1), a reinforcing rod portion (2) and a shank portion (3), wherein the reinforcing rod portion (2) is located between the cutting portion (1) and the shank portion (3), the cutting portion (1) is fixedly connected to one side of the reinforcing rod portion (2), and the shank portion (3) is fixed to the other side of the reinforcing rod portion (2); a cutting edge (101) and a chip groove (102) are provided in the circumferential direction of the cutting portion (1), the number of the cutting edge (101) and the number of the chip groove (102) are both four, the cutting edge (101) and the chip groove (102) are staggered in the circumferential direction of the cutting portion (1), and the cutting edge (101) is in the shape of a sine curve.

2. A welded corrugated milling cutter for machining ultra-high strength steel narrow curved deep grooves according to claim 1, characterized in that: The sinusoidal cutting edge (101) is provided with wave crests (103) and wave troughs (104), and the wave crests (103) and wave troughs (104) change periodically.

3. The welded corrugated milling cutter for machining ultra-high strength steel narrow curved deep grooves according to claim 1, characterized in that: The material of the cutting part (1) is W2Mo9Cr4VCo8.

4. The welded corrugated milling cutter for machining ultra-high strength steel narrow curved deep grooves according to claim 1, characterized in that: The reinforcing rod part (2) and the handle part (3) are an integrated structure and are made of No. 50 steel.

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