CN102601436A - Double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool - Google Patents

Abstract

The invention relates to a double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool. High processing difficulty, low cutting efficiency and short service life of a tool are caused by the mutual influence of physical, chemical and mechanical properties of titanium alloy, so that the titanium alloy becomes a typical difficultly processed material. The double-arc irregular shaped inner-cooling type efficient titanium alloy milling tool comprises a tool handle (1), wherein the tool handle (1) is transited to a milling tool bit with a double-arc shape at the front end through a cone (2); a pair of chip pockets (6) with front angle structures are arranged on one side of the tool bit; a cooling liquid channel (5) is arranged at the center of the tool; an outlet of the cooling liquid channel is located on the end part of the tool; and a negative chamfered edge (7) is arranged on the tail part of the tool. The invention is applied to the milling tool.

Description

Double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool

technical field

The invention relates to a milling tool.

Background technique

Due to the interaction of physical, chemical and mechanical properties of titanium alloy, it is difficult to process, low cutting efficiency and short tool life, making it a typical difficult-to-machine material. Its main cutting features are as follows:

(1) The contact area between the chips and the rake face is small, the tool tip stress is large, and the temperature is high, which makes the tool tip and cutting edge easy to wear.

(2) The coefficient of friction is large. Under the same conditions, titanium alloy materials have a larger friction coefficient than ordinary carbon steel, and the friction work done by chips flowing through the rake face is large, resulting in higher friction interface temperature and making the tool easy to wear.

(3) High chemical activity. The chemical activity of titanium alloy is very high at high temperature, and it can chemically react with oxygen, nitrogen and water vapor in the air to form a hardened layer on the surface of titanium alloy, resulting in a substantial increase in the hardness of the workpiece, while reducing the plasticity of the workpiece and making the chip and the former The contact length of the tool face is further reduced, leading to faster tool wear.

(4) Low thermal conductivity. The thermal conductivity of titanium alloy is only 1/5 of that of iron and 1/14 of that of aluminum. In addition, the contact length between the tool and the chips is short, so that the cutting heat accumulates in a small area near the cutting edge and is not easy to dissipate, resulting in excessive temperature of the tool. Accelerated tool wear.

(5) The modulus of elasticity is small. Due to the small elastic modulus and large yield ratio of titanium alloy, the machined surface of the workpiece is prone to rebound during the cutting process, which may easily cause the flank wear of the tool to increase and the workpiece to deform.

(6) Higher requirements for machine tools. The cutting process of titanium alloy requires the machine tool to have good rigidity and low vibration. When in use, there are certain requirements for the process system of the machine tool. Chipping occurs to improve the reliability of the experimental data.

Contents of the invention

The invention provides a milling tool.

The purpose of the invention is achieved in this way:

A double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, which consists of: a tool handle, the tool handle transitions to the front end with a double-arc milling head through a cone, and one side of the tool head It has a pair of chip flutes with a rake angle structure, the center of the tool has a coolant channel, the outlet of the coolant channel is located at the end of the tool, and the tail of the tool has a negative chamfer.

The above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the double-arc milling head includes a small curvature ball head at the end of the tool, and a large curvature ball is between the small curvature ball head and the tool head.

For the above-mentioned dual-arc special-shaped internally cooled titanium alloy high-efficiency milling tool, the tool handle is cylindrical with a diameter of 10-14 mm.

For the above-mentioned dual-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the diameter of the shank is 12 mm.

In the above-mentioned double-arc special-shaped internally cooled titanium alloy high-efficiency milling tool, the cone has a taper of 2°~4°.

The above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the taper of the cone is 3°

For the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the negative chamfer size is (1mm~2mm) x 45°.

In the aforementioned double-arc special-shaped inner-cooled titanium alloy high-efficiency milling tool, the radius of curvature of the small-curvature ball head is 8-12 mm.

For the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the radius of curvature of the small curvature ball head is 10 mm.

In the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the radius of curvature of the large-curvature ball head is twice that of the small-curvature ball head, with a tolerance of 0.5 mm.

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Beneficial effect:

1. The present invention mainly solves the problems of high cutting temperature, premature tool wear and failure, and unstable high-speed milling during semi-finishing and finishing machining of titanium alloys, effectively improving tool life and processing efficiency and reducing production costs.

2. The ball head part of the top of the present invention adopts a double-arc over-design, the tip of the ball head is a small-curvature arc, and the transition between the ball-head tip and the cone is a large-curvature arc. The cutter head with double-arc structure has an elliptical axial cross-section. On the premise of ensuring the rigidity of the cutter, the taper of the cutter tip of the cutter is maximized, thereby improving the sharpness of the cutter and effectively reducing the Axial force during cutting.

3. While the present invention adopts this structure to produce the above advantages, it can not only increase the contact area between the cutting edge and the workpiece surface, improve the surface removal rate of materials, improve the production and processing efficiency, but also effectively reduce the processing cost.

4. The chip flute of the present invention adopts a semi-closed flute design with a large volume ratio, and the groove bottom and the central axis of the hilt form a helix angle of about 1° from the tip to the hilt. This design scheme improves the efficiency of chips, especially chip discharge; in the case of high-speed milling, the helix angle of about 1° can effectively ensure the rigidity and bending resistance of the tool holder, and at the same time, it can make the chips and coolant along the arc The groove wall is sprayed out, so that the cutting heat is taken away by the chips and coolant; the large volume rate chip flute can effectively increase the heat dissipation area of the tool participating in the cutting part, and at the same time can play a role in dispersion.

5. The present invention announces the optimal curvature of the small-rate arc and the large-curvature arc of the double-arc milling cutter, which realizes the optimization results of the outflow of the double-arc milling cutter cleaning fluid, cutting effect, and tool strength. Improve the efficiency and accuracy of industrial production.

Description of drawings:

Accompanying drawing 1 is the front view of this product.

Accompanying drawing 2 is the side view of this product.

Accompanying drawing 3 is the plan view of Fig. 2.

Detailed ways:

Example 1:

A double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, which consists of: a tool handle 1, the tool handle 1 transitions through a cone 2 to a double-arc-shaped milling head at the front end, and the tool handle One side of the head has a pair of chip pockets 6 with a rake angle structure, the center of the tool has a coolant channel 5, the outlet of the coolant channel is located at the end of the tool, and the tail of the tool has a negative Edge 7.

Example 2:

The above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the double-arc milling head includes a small curvature ball head 4 at the end of the tool, and the gap between the small curvature ball head 4 and the cone 2 is It is a large curvature ball head 3.

Example 3:

For the above-mentioned dual-arc special-shaped internally cooled titanium alloy high-efficiency milling tool, the tool handle is cylindrical with a diameter of 10-14 mm.

Example 4:

For the above-mentioned double-arc special-shaped internally cooled titanium alloy high-efficiency milling tool, the diameter of the shank is 12 mm.

Example 5:

In the aforementioned double-arc special-shaped inner-cooled titanium alloy high-efficiency milling tool, the cone has a taper of 2° to 4°.

Embodiment 6:

In the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the taper of the cone is 3°.

Embodiment 7:

For the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the negative chamfer size is (1mm~2mm) x 45°.

Embodiment 8:

In the aforementioned double-arc special-shaped inner-cooled titanium alloy high-efficiency milling tool, the radius of curvature of the small-curvature ball head is 8-12 mm.

Embodiment 9:

For the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the radius of curvature of the small curvature ball head is 10 mm.

Example 10:

In the above-mentioned double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, the radius of curvature of the large-curvature ball head is twice that of the small-curvature ball head, with a tolerance of 0.5 mm.

Example 11:

The invention is a high-efficiency milling tool for a double-arc special-shaped internal cooling titanium alloy. Its shape and structure are generally similar to the integral tapered ball end milling cutter. The main innovation is that the present invention adopts the design scheme of two arcs with different curvatures tangent to form the ball end, that is, the tip of the ball end is an arc with small curvature. , The arc of the transitional area connecting the ball tip to the handle and the cone is a large curvature circle. The chip flute adopts a semi-closed flute design with a large volume ratio, and the groove bottom and the central axis of the tool handle form a helix angle of about 1° from the tool tip to the tool handle. The geometric center of the tool holder is designed with a thin coolant channel in the direction of the cutting area, and there are two axisymmetric nozzles at the large curvature arc.

Claims (10)

1. A double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool, which consists of: a knife handle, which is characterized in that: said knife handle transitions to a front end with a double-arc type milling head through a cone, so One side of the cutter head has a pair of chip flutes with a rake angle structure, the center of the tool has a coolant channel, the outlet of the coolant channel is located at the end of the tool, and the tail of the tool has a negative Chamfer. 2. The high-efficiency double-arc special-shaped internal cooling titanium alloy milling tool according to claim 1, characterized in that: the double-arc milling head includes a small curvature ball head at the end of the tool, and the small Between the curvature ball head and the tool is a large curvature ball head. 3. The dual-arc special-shaped internal cooling titanium alloy high-efficiency milling tool according to claim 1 or 2, wherein the tool holder is cylindrical with a diameter of 10-14 mm. 4. The high-efficiency milling tool of double-arc special-shaped internal cooling titanium alloy according to claim 1 or 2, characterized in that: the diameter of the shank is 12mm. 5. The high-efficiency milling tool for double-arc special-shaped internal cooling titanium alloy according to claim 1 or 2, characterized in that: said cone has a taper of 2°~4°. 6. The high-efficiency milling tool of double-arc special-shaped internal cooling titanium alloy milling tool according to claim 1 or 2, characterized in that: the taper of the cone is 3°. 7. The double-arc special-shaped internal cooling titanium alloy high-efficiency milling tool according to claim 1 or 2, characterized in that: the size of the negative chamfer is (1mm~2mm) x 45°. 8. The high-efficiency milling tool for double-arc special-shaped internal cooling titanium alloy according to claim 2, characterized in that: the radius of curvature of the small curvature ball head is 8-12 mm. 9. The high-efficiency milling tool of double-arc special-shaped internal cooling titanium alloy according to claim 2 or 8, characterized in that: the radius of curvature of the small curvature ball head is 10mm. 10. According to claim 2 or 8, the high-efficiency milling tool of double-arc special-shaped internal cooling titanium alloy is characterized in that: the radius of curvature of the large-curvature ball head is twice that of the small-curvature ball head, with a diameter of 0.5mm tolerance.

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