A quick feed turning tool with bevel edge

Abstract

The application provides a bevel edge fast-feeding turning tool, which comprises a bevel edge fast-feeding tool bar and a bevel edge fast-feeding tool piece; one side of the top corner side of the bevel edge fast-feeding tool piece is chamfered by 17.5 degrees as a rake face; the other side of the top corner side of the bevel edge fast-feeding tool piece is chamfered by 10 degrees as a relief face; the intersection of the rake face and the relief face is a cutting edge; and the outer edge of the cutting edge is a blade edge chamfering. The bevel edge fast-feeding turning tool has the advantages that the contact length of the main cutting edge of the tool piece and the chip is prolonged through the special blade edge design concept, the concentrated wear of the tool tip position is shared, the heat dissipation area of the tool tip is increased, the blade edge wear is delayed, and the service life of the tool piece is prolonged; and the bevel edge fast-feeding turning tool breaks through the limitation that the conventional tool piece takes the tool tip arc as the blade edge, and the tool bar angle is deflected and the top side of the tool piece is chamfered, so that the chip thickness is ensured, the feeding speed is increased, and the surface roughness is reduced.

Description

Technical Field

[0001] This invention belongs to the field of machining technology and relates to cutting tools, specifically to a slanted-edge rapid feed turning tool. Background Technology

[0002] With the accelerated digital transformation of the manufacturing industry, there are increasing demands for more efficient, stable, environmentally friendly, and lower-cost post-processing of gear products. Currently, post-heat turning is increasingly widely used. Compared to traditional grinding, post-heat turning offers advantages such as high processing efficiency, high flexibility, low equipment investment, and cleanliness. However, post-heat turning still faces some bottlenecks that restrict automated production lines. For example, after heat treatment, gear parts have high surface hardness, high cutting temperature and force, leading to rapid insert wear and short tool life during processing. This results in frequent downtime for tool changes, affecting the operating rate of automated lines and failing to meet the requirements of smart factories. Furthermore, as the final finishing process, post-heat turning requires high dimensional accuracy and surface quality. To ensure stability, the turning feed rate is typically low, resulting in long cycle times. Finally, CBN (cubic boron nitride) inserts used in post-heat turning are expensive, have short lifespans, high per-piece processing costs, high workshop consumption, and high tool procurement costs.

[0003] Taking the intermediate shaft gear of a transmission as an example, after hot turning, the inner hole D70 is required, with a surface roughness Ra of less than 0.8. Machining is performed on a CNC horizontal lathe using an internal boring bar with a known standard CBN insert (CNGA120408). The insert life is 80 pieces / cutting edge, the cost per tool is 0.75 yuan, and the machining cycle is 70 seconds. On an automated line, continuous machining can only be achieved for approximately 2 hours. To improve the insert life and reduce machining costs after hot turning, the insert material is usually optimized to improve wear resistance, but the improvement is minimal. Alternatively, finishing inserts are used to increase the feed rate, but when the workpiece or tool bar has low rigidity, finishing inserts are prone to vibration marks. Improving the CBN insert life and ensuring stable production on automated lines remains a pressing technical problem for enterprises in hot turning processes. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to propose a slanted-edge rapid feed turning tool to solve the technical problem that cutting tools in the existing technology are unable to simultaneously achieve workpiece surface roughness and tool life.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A helical-edge rapid feed turning tool includes a helical-edge rapid feed tool holder and a helical-edge rapid feed insert. The helical-edge rapid feed insert has a 17.5° chamfered side at the apex angle as a rake face and a 10° chamfered side at the apex angle as a flank face. The edge where the rake face and the flank face intersect is the cutting edge, and the outer edge of the cutting edge is a chamfered edge.

[0007] The present invention also has the following technical features:

[0008] The method for determining the yaw angle of the inclined blade rapid feed bar includes the following steps:

[0009] Step 1: Restore the rake angle of the standard tool holder A40T-DDUNL1504 (-6°) and the inclination angle (-11°) to 0° to obtain a slanted-edge rapid feed tool holder.

[0010] Step 2: Install the DNGA150408 standard insert on the slanted-edge rapid feed bar. Rotate the DNGA150408 standard insert around its own center about the Y-axis of the machine tool coordinate system. Then, translate the DNGA150408 standard insert upward along the positive Y-axis of the machine tool coordinate system. Finally, rotate the DNGA150408 standard insert around the X-axis of the machine tool coordinate system through the intersection of the base surface and the top edge, so that the rake angle of the DNGA150408 standard insert is positive 45°, thus obtaining the yaw angle of the slanted-edge rapid feed bar.

[0011] The cutting edge is designed as an R16 arc on the rake face.

[0012] The chamfer width of the cutting edge is 0.12mm, and the chamfer angle is 15°.

[0013] The cutting edge of the cutting edge is dulled by R0.02.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] (I) The inclined cutting edge rapid feed turning tool proposed in this invention extends the contact length between the main cutting edge of the insert and the chip through a unique cutting edge design concept, thereby distributing the concentrated wear at the tool tip position and increasing the heat dissipation area at the tool tip, so as to delay the wear of the cutting edge and improve the life of the insert.

[0016] (II) The inclined cutting edge fast feed turning tool proposed in this invention breaks through the limitation of conventional inserts using the tip arc as the cutting edge. By deflecting the tool holder angle and chamfering the top edge of the insert, it ensures sufficient chip thickness while increasing feed speed and reducing surface roughness.

[0017] (III) The inclined cutting edge fast feed turning tool proposed in this invention realizes fast feed turning of the inner hole with the top edge of the insert as the cutting edge. The top edge cutting edge is inclined at 45° to the base surface. The inclined cutting edge is layered, the machining is stable, the tool life can reach 4-8 times that of ordinary inserts, the feed speed is about 3 times that of ordinary inserts, the machining efficiency is high, and the surface roughness is low. Attached Figure Description

[0018] Figure 1 This is a front view two-dimensional structural diagram of the left-hand oblique-edge rapid feed shank.

[0019] Figure 2 This is a two-dimensional side view of the left-hand oblique-edge rapid feed shank.

[0020] Figure 3 This is a schematic diagram of the structure of a right-hand oblique-edge rapid feed insert.

[0021] Figure 4 This is a front view two-dimensional structural diagram of the right-hand oblique-edge rapid feed insert.

[0022] Figure 5 This is a two-dimensional side view of the right-hand oblique-edge rapid feed insert.

[0023] Figure 6 This is a three-dimensional structural diagram of a slanted-edge rapid-feed turning tool.

[0024] Figure 7 Photographs showing the machining process of a turning tool with a slanted cutting edge and rapid feed.

[0025] The meanings of the labels in the diagram are as follows: 1-slanted rapid feed shank, 2-slanted rapid feed insert, 3-rake face, 4-flank face, 5-cutting edge, 6-beveling edge.

[0026] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, all devices and components in this invention are devices and components known in the prior art.

[0028] The standard tool holder A40T-DDUNL1504 and standard insert DNGA150408 used in this invention both employ known standard tool holders and inserts. The standard tool holder A40T-DDUNL1504 has a D40 side-fixed shank, with a thickened head to improve rigidity. The standard insert DNGA150408 is a rhomboid insert with a 55° apex angle, an inscribed circle diameter of 12.7 mm, and a thickness of 4.76 mm. Through-type CBN cutting tips are welded to both sides of the insert base.

[0029] The principle of the bevel cutting rapid feed turning tool and the internal bevel cutting rapid feed turning tool in this embodiment is the same. Depending on the tool feed direction, an external bevel cutting rapid feed turning tool or an end face bevel cutting rapid feed turning tool can be designed, suitable for external diameter machining or end face machining, respectively. The top edge arc R16 is asymmetrical on both sides. When the cutting edge faces the user and the rake face is upward, if the highest point of the arc is slightly to the left, and the right side cuts into the workpiece first, it is considered a right-handed insert. Conversely, if the highest point of the arc is slightly to the right, and the left side cuts into the workpiece first, it is considered a left-handed insert. In this embodiment, a left-handed internal bevel cutting rapid feed tool holder is equipped with a right-handed bevel cutting rapid feed insert, and vice versa. Similarly, a left-handed external bevel cutting rapid feed tool holder is equipped with a left-handed bevel cutting rapid feed insert, and a right-handed external bevel cutting outer diameter rapid feed tool holder is equipped with a right-handed bevel cutting rapid feed insert.

[0030] Following the above technical solutions, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0031] Example:

[0032] This embodiment provides a helical-edge rapid feed turning tool, including a helical-edge rapid feed tool holder 1 and a helical-edge rapid feed insert 2, such as... Figures 1 to 6 As shown, the apex side of the inclined blade rapid feed insert 2 is chamfered at 17.5° to form the rake face 3, and the other side of the apex side of the inclined blade rapid feed insert 2 is chamfered at 10° to form the flank face 4. The edge where the rake face 3 and the flank face 4 intersect is the cutting edge 5, and the outer edge of the cutting edge 5 is the cutting edge chamfer 6.

[0033] The method for determining the yaw angle of the helical blade rapid feed bar 1 includes the following steps:

[0034] Step 1: Restore the rake angle of the standard tool holder A40T-DDUNL1504 (-6°) and the inclination angle (-11°) to 0° to obtain the inclined edge rapid feed tool holder 1.

[0035] Step 2: Install the DNGA150408 standard insert on the helical rapid feed bar 1. Rotate the DNGA150408 standard insert around the Y-axis of the machine tool coordinate system through its own center until the principal cutting edge angle of the helical rapid feed bar 1 is 107.5°. Then, translate the DNGA150408 standard insert upward along the positive Y-axis of the machine tool coordinate system by 1.2mm. Finally, rotate the DNGA150408 standard insert around the X-axis of the machine tool coordinate system through the intersection of the base surface and the top edge to make the rake angle of the DNGA150408 standard insert positive 45°, thus obtaining the yaw angle of the helical rapid feed bar 1.

[0036] like Figure 5As shown, the cutting edge 5 is designed as an arc of R16 on the rake face 3, which results in good tool finishing and low surface roughness.

[0037] In this embodiment, the chamfer width of the cutting edge chamfer 6 is preferably 0.12mm, and the chamfer angle is 15°.

[0038] In this embodiment, the cutting edge 5 is preferably dulled by R0.02.

[0039] In this embodiment, taking the precision machining of the inner hole of the intermediate shaft gear after heat treatment as an example, such as... Figure 7 As shown, the usage process of the beveled rapid feed tool in this embodiment is as follows:

[0040] Step 1: Prepare the helical cutting rapid feed turning tool. Install the helical cutting rapid feed tool holder 1 into the CNC lathe turret tool holder. Then, install the helical cutting rapid feed insert 2 on the helical cutting rapid feed tool holder 1. Install the right-hand helical cutting rapid feed insert 2 on the left-hand inner hole of the helical cutting rapid feed tool holder 1. When installing the helical cutting rapid feed insert 2, pay attention to the direction. The rake face 3 of the helical cutting rapid feed insert 2 should face forward (i.e., the feed direction). Finally, tighten the pressure plate screw on the helical cutting rapid feed tool holder 1.

[0041] Step 2: Loading the workpiece, clamping it in the machine tool's fixture, and securing the workpiece.

[0042] Step 3: Tool setting. With the cutting edge on the slant feed, quickly feed the insert 2 to its highest point and measure the tool length in the X and Z directions in the machine tool. Then, input the tool compensation value corresponding to the tool number.

[0043] Step 4: Program the CNC machining program (cutting parameters are V160, F0.35).

[0044] Step 5: Trial cutting. Start the program, complete the trial cutting, measure the dimensions, and adjust the tool compensation value until the first piece is qualified.

[0045] Step 6: Tool change. When the life of the inclined blade rapid feed turning tool is reached, the life count of the inclined blade rapid feed turning tool is reset to zero, the insert is rotated 180°, and the tool tip is replaced with No. 2, and machining continues.

[0046] Specifically, in this embodiment, this slanted-edge rapid-feed turning tool is applied to the post-heat finishing process of the intermediate shaft gear inner hole. The feed rate is increased from the original 0.12 mm / r to 0.35 mm / r, resulting in no vibration marks in the inner hole, stable quality, and surface roughness meeting process requirements. Tool life is increased from 80 pieces / cutting edge to 600 pieces / cutting edge, 7.5 times that of the original insert. The machining cycle time is reduced from 70 seconds to 50 seconds, improving efficiency by 28%. The cost per piece is reduced from 0.75 yuan to 0.25 yuan, resulting in a 67% cost reduction for the tool itself. Through the design and application of this slanted-edge rapid-feed turning tool, the tool life of the post-heat finishing process is significantly improved, reducing tool change frequency, increasing machining efficiency and machine tool uptime, and significantly reducing machining costs. At the same time, it improves workpiece quality stability, enabling efficient and stable production of the post-heat finishing process, meeting process requirements and the needs of automated production.

Claims

1. A helical-edge rapid feed turning tool, comprising a helical-edge rapid feed tool holder (1) and a helical-edge rapid feed insert (2), characterized in that, The oblique-edge rapid feed insert (2) has a 17.5° chamfer on one side of the top corner as the rake face (3), and a 10° chamfer on the other side of the top corner as the flank face (4). The edge where the rake face (3) and the flank face (4) intersect is the cutting edge (5), and the outer edge of the cutting edge (5) is the chamfer (6). The method for determining the yaw angle of the aforementioned helical-edged rapid feed bar (1) includes the following steps: Step 1: Restore the rake angle of the standard tool holder A40T-DDUNL1504 (-6°) and the inclination angle (-11°) to 0° to obtain the inclined edge rapid feed tool holder (1). Step 2: Install the DNGA150408 standard insert on the slanted-edge rapid feed bar (1), rotate the DNGA150408 standard insert around the Y-axis of the machine tool coordinate system through its own center, then translate the DNGA150408 standard insert upward along the positive Y-axis of the machine tool coordinate system, and finally rotate the DNGA150408 standard insert around the X-axis of the machine tool coordinate system through the intersection of the base surface and the top edge, so that the rake angle of the DNGA150408 standard insert is positive 45°, and obtain the yaw angle of the slanted-edge rapid feed bar (1); The cutting edge (5) is designed as an arc of R16 on the rake face (3); The chamfer width of the chamfer (6) is 0.12 mm and the chamfer angle is 15°; The cutting edge of the cutting edge (5) is dulled by R0.02.

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