A tool holder for machining U-grooves in thin-walled crank-type parts

Abstract

This utility model relates to the technical field of tool holders for machining thin-walled grooves, specifically to a tool holder for machining U-shaped grooves in thin-walled crank-type parts, including a handle body and a rod body disposed at the top of the handle body; the handle body has a transverse through groove for mounting a single-edged boring tool, and the bottom of the handle body has a bolt hole for fixing the rod of the single-edged boring tool, the bolt hole being longitudinally connected to the through groove; the bolt and bolt hole between the tool holder and the tool enhance the fixing stability; when the frustum structure of the single-edged boring tool rod pushes the sliding component to compress the liquid bladder, the liquid bladder is pressurized and sprays lubricant evenly through the spray nozzle onto the contact surface between the side wall of the boring tool rod and the through groove, actively forming a lubricating oil film during installation, effectively avoiding direct dry friction between the boring tool rod and the inner wall of the tool holder, significantly reducing tool wear and tool holder damage, ensuring that the side wall of the U-shaped groove maintains a rigid support state during fine milling and effectively avoiding the problem of groove width expansion caused by friction during installation.

Description

Technical Field

[0001] This utility model relates to the technical field of tool holders for machining thin-walled grooves, specifically to a tool holder for machining U-shaped grooves in thin-walled crank-type parts. Background Technology

[0002] Currently, in the industry, when performing precision machining of thin-walled deep grooves in parts, general-purpose standard tool holders such as side-locked tool holders, spring collet tool holders, or hydraulic tool holders are commonly used. These existing tool holders connect to the machine tool spindle through tapered interfaces such as BT and HSK. Their core function is to clamp cylindrical end mills and transmit cutting torque. The structural design focuses on general clamping stability and basic rigidity, mainly serving the milling needs of conventional parts.

[0003] Existing standard tool holders have significant technical drawbacks when used for finish milling thin-walled U-grooves. The primary drawback is the inability to suppress workpiece deformation caused by cutting forces. The U-groove sidewalls of thin-walled crank parts are extremely weak in rigidity, and the radial cutting force applied by the tool to the sidewalls during finish milling is enormous. Current technology uses five-axis machining centers, typically employing bar end mills for milling. During machining, the multi-edged cutting of the end mill generates significant cutting forces, causing elastic deformation of the thin-walled part. This results in the actual cutting path deviating from the predetermined trajectory, affecting machining accuracy and surface quality. This can lead to dimensional errors, surface warping, wavy surfaces, or ultimately, scrapping the product.

[0004] When precision milling parts with thin-walled U-groove structures, using ordinary milling cutters can easily cause deformation under cutting forces, leading to dimensional deviations and shape errors. Existing tool holders only passively transmit this radial force and are not specifically designed for mounting single-edged boring tools. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a tool holder for machining U-shaped grooves of thin-walled crank parts.

[0006] The technical solution of this utility model is a tool holder for machining U-shaped grooves of thin-walled crank parts: it includes a handle body and a rod body disposed on the top of the handle body; the handle body is provided with a through groove for mounting a single-edged boring tool in the horizontal direction, and the bottom of the handle body is provided with a bolt hole for fixing the rod part of the single-edged boring tool, and the bolt hole is longitudinally connected to the through groove.

[0007] Note: Magnetic adsorption can assist in positioning, reduce manual adjustment time, and shorten the tool change cycle.

[0008] Furthermore, a retaining ring is provided inside the through groove; an anti-wear pad is provided on the end of the retaining ring facing into the through groove.

[0009] Note: A retaining ring and an anti-wear pad at its end are added inside the through groove to reduce the impact of the axial frustum part of the tool during installation and reduce wear during installation.

[0010] Furthermore, the retaining ring has a cavity for filling lubricant; a sliding member is slidably engaged inside the through groove, and a sliding groove is provided along the length direction inside the through groove; a protrusion is provided on the side wall of the sliding member that slidably engages with the sliding groove; a return spring and a liquid bladder fixedly sleeved with the return spring are provided between the sliding groove and the sliding member; multiple spray nozzles are provided on the sliding member, and each spray nozzle is connected to one end of the liquid bladder through a conduit with a one-way valve, and the other end of the liquid bladder is connected to the cavity inside the retaining ring through a one-way valve; the one-way valve at the spray nozzle is for unidirectional outward flow from inside the liquid bladder, and the one-way valve between the cavity inside the retaining ring and the liquid bladder is for unidirectional inflow from inside the cavity into the liquid bladder; the cavity inside the retaining ring is made of deformable bladder material; a guide groove for limiting the sliding member is provided along the length direction inside the through groove, and a guide block is provided on the sliding member that slidably engages with the guide groove.

[0011] Explanation: The sliding component uses a locking mechanism between the protrusion and the sliding groove to reset the spring and the liquid bladder. When installing the tool, the frustum structure on the side wall of the single-edged boring bar pushes the sliding component to compress the spring and the liquid bladder. The pressure in the liquid bladder causes lubricant to be sprayed out from the nozzle. While the boring bar pushes the sliding component, it also applies lubricant, preventing wear between the side wall of the boring bar and the inner wall of the through groove. This protects the boring bar and the tool holder while reducing the widening of the groove due to wear.

[0012] Furthermore, ball bearings are provided on the surface of the protrusion that contacts the sliding groove.

[0013] Explanation: The sliding groove contact surface protrusions are embedded with ball bearings, which convert sliding friction into rolling friction; this greatly reduces the moving resistance of the sliding parts, ensuring smooth and unobstructed tool installation, while also improving the expansion and contraction response speed of the liquid bladder, thus enhancing the sensitivity and reliability of the shock absorption system simultaneously.

[0014] Furthermore, a first magnet for positioning is provided at the bolt hole inside the through groove, and a second magnet corresponding to the first magnet is provided at the screw hole on the surface of the single-edged boring bar.

[0015] Note: A first magnet is installed at the bolt hole in the through groove, corresponding to the second magnet on the single-edged boring bar. The magnetic attraction enables the tool to be pre-positioned, ensuring that the bolt hole is automatically and accurately aligned, eliminating manual adjustment errors, shortening tool change time, avoiding tool misalignment and installation stress caused by forced bolt tightening, and ensuring initial machining accuracy.

[0016] The beneficial effects of this utility model are as follows: The tool holder for machining U-grooves of thin-walled crank parts of this utility model has an anti-wear pad that can buffer the impact of the sliding parts when installing the tool, reducing wear. When the truncated cone structure of the single-edged boring bar pushes the sliding parts to compress the liquid bladder, the liquid bladder is pressurized and sprays the lubricant evenly through the spray nozzle to the contact surface between the side wall of the boring bar and the through groove. During the installation process, a lubricating oil film is actively formed, which effectively avoids direct dry friction between the boring bar and the inner wall of the tool holder, significantly reducing tool wear and tool holder damage. At the same time, the lubricating film fills potential assembly gaps, eliminates the risk of loosening of the connection due to wear, and ensures that the rigidity of the tool holder system is always in the best state during the cutting process. This design allows the side wall of the U-groove to maintain a rigid support state during fine milling and effectively avoids the problems of groove width expansion and side wall drum-shaped torsion wear caused by friction when installing the single-edged boring bar. The magnetic positioning structure ensures that the boring bar is quickly and accurately positioned, which is convenient for bolt locking and fixing. The synergistic effect of vibration suppression and rigid fixation enhancement greatly improves the dimensional accuracy consistency and surface finish qualification rate of deep groove machining of thin-walled crank parts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the internal structure of the through groove in Embodiment 1 of this utility model; Figure 3 This is a longitudinal sectional view of the handle body in Embodiment 2 of this utility model; Figure 4 This is a schematic diagram of the overall structure of the single-edged boring tool according to Embodiment 2 of this utility model; Among them, 1-handle body, 11-through groove, 111-sliding groove, 12-bolt hole, 2-rod body, 3-retaining ring, 31-anti-wear pad, 4-sliding part, 41-protrusion, 42-reset spring, 43-liquid bladder, 44-guide block, 5-first magnet, 6-second magnet. Detailed Implementation

[0018] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0019] Example 1: As Figure 1 The tool holder shown is for machining U-shaped grooves of thin-walled crank parts, including a handle body 1 and a rod body 2 disposed on the top of the handle body 1; the handle body 1 is provided with a transverse through groove 11 for mounting a single-edged boring tool, and the bottom of the handle body 1 is provided with a bolt hole 12 for fixing the rod part of the single-edged boring tool, and the bolt hole 12 is longitudinally connected to the through groove 11.

[0020] Example 2: As Figure 4As shown, this embodiment differs from Embodiment 1 in that a retaining ring 3 is provided inside the through groove 11; an anti-wear pad 31 is provided on the end of the retaining ring 3 facing into the through groove 11; the retaining ring 3 has a cavity for filling with lubricant; a sliding member 4 is slidably engaged inside the through groove 11; a sliding groove 111 is provided along the length direction inside the through groove 11; and a protrusion 41 is provided on the side wall of the sliding member 4 that slidably engages with the sliding groove 111. A return spring 42 and a liquid bladder 43 fixedly sleeved with the return spring 42 are provided between the sliding groove 111 and the sliding member 4; the sliding member 4 is provided with a plurality of spray nozzles, each of which is connected to one end of the liquid bladder 43 through a conduit with a one-way valve, and the other end of the liquid bladder 43 is connected to the cavity inside the retaining ring 3 through a one-way valve; the one-way valve at the spray nozzle is for unidirectional outflow from inside the liquid bladder, and the one-way valve between the cavity inside the retaining ring 3 and the liquid bladder is for unidirectional inflow from inside the cavity to the liquid bladder; the cavity inside the retaining ring 3 is made of deformable bladder material; a guide groove 112 for limiting the sliding member 4 is provided along the length direction in the through groove 11; a guide block 44 is provided on the sliding member 4 that is slidably engaged with the guide groove 112; A first magnet 5 for positioning is provided at the bolt hole 12 inside the through groove 11, and a second magnet 6 corresponding to the first magnet 5 is provided at the screw hole on the surface of the single-edged boring bar; both the first magnet 5 and the second magnet 6 are annular magnetic sheets.

[0021] The working principle of this embodiment is as follows: When installing a single-edged boring bar, guide the single-edged boring bar into the through groove 11. The frustum structure of the rear half of the single-edged boring bar can compress the sliding member 4 to slide along the sliding groove 111, while simultaneously compressing the return spring 42 and the liquid bladder 43, causing lubricant to be sprayed out from the spray nozzle. The boring bar pushes the sliding member while applying lubricant, avoiding wear between the side wall of the boring bar and the inner wall of the through groove, protecting the boring bar and the tool holder, and preventing the groove width from widening due to wear. When the first magnet 5 attracts the second magnet 6, stop guiding the tool. Fix the single-edged boring bar with bolts and perform cutting operations on the workpiece. When removing the single-edged boring bar, remove the bolts. At the same time, the return spring 42 drives the liquid bladder 43 to rebound and stretch, drawing the lubricant inside the retaining ring 3, so that the lubricant inside the liquid bladder 43 is replenished.

[0022] Example 3: The difference between this example and Example 1 is that the surface of the protrusion 41 that contacts the sliding groove 111 is provided with ball bearings; the surface of the guide block 44 that contacts the guide groove 112 is also provided with ball bearings.

Claims

1. A tool holder for processing a U-shaped groove of a thin-walled crank-like part, characterized in that, Includes a handle (1) and a rod (2) disposed at the top of the handle (1); a through groove (11) for mounting a single-edged boring tool is provided laterally on the handle (1), and a bolt hole (12) for fixing the rod of the single-edged boring tool is provided at the bottom of the handle (1), the bolt hole (12) being longitudinally connected to the through groove (11); a retaining ring (3) is provided inside the through groove (11); an anti-wear pad (31) is provided on the end of the retaining ring (3) facing into the through groove (11); the retaining ring (3) has a cavity for filling with lubricant; a sliding member (4) is slidably engaged inside the through groove (11), and a sliding groove (111) is provided along the length direction inside the through groove (11); the sliding member (4) is slidably engaged inside the through groove (11). The side wall of the component (4) is provided with a protrusion (41) that slides and engages with the sliding groove (111); a return spring (42) and a liquid bladder (43) fixedly sleeved with the return spring (42) are provided between the sliding groove (111) and the sliding component (4); the sliding component (4) is provided with a plurality of spray nozzles, each of which is connected to one end of the liquid bladder (43) through a conduit with a one-way valve, and the other end of the liquid bladder (43) is connected to the cavity inside the retaining ring (3) through a one-way valve; a guide groove (112) for limiting the sliding component (4) is provided in the through groove (11) along the length direction, and a guide block (44) that slides and engages with the guide groove (112) is provided on the sliding component (4).

2. The tool holder for machining a U-shaped groove of a thin-walled crank part according to claim 1, characterized in that The surface of the protrusion (41) that contacts the sliding groove (111) is provided with balls.

3. The tool holder according to claim 2, characterized in that A first magnet (5) for positioning is provided at the bolt hole (12) inside the through groove (11), and a second magnet (6) corresponding to the first magnet (5) is provided at the screw hole on the surface of the single-edged boring bar.

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