A type of corner grinder

Abstract

This utility model provides a corner rounding grinder, including a bakelite milling machine. The milling cutter of the bakelite milling machine is a corner rounding cutter. A guide rail is fixedly installed on the grinding end of the bakelite milling machine. The extension direction of the guide rail is perpendicular to the rotation axis of the corner rounding cutter. A fixed frame is slidably installed on the guide rail. The fixed frame includes a guide plate and multiple positioning pins. The guide plate is slidably installed on the guide rail and slides back and forth along the guide rail. The positioning pins are fixedly installed on the guide plate. The multiple positioning pins clamp and fix the workpiece to be processed, so that the corner position of the workpiece is fixed in the cutting area of ​​the corner rounding cutter. The beneficial effects of this utility model are: through the guide rail system set perpendicular to the axis of the milling cutter, the sliding guide plate drives the fixed frame to clamp the workpiece and feed it in a straight line, ensuring that the corner of the workpiece is accurately positioned in the cutting area of ​​the milling cutter, which significantly improves the rounding accuracy; the return spring buffers the cutting vibration and prevents overcutting caused by workpiece displacement. At the same time, the handle keeps the operator's hand away from the cutter head, completely eliminating the risk of cutting injury.

Description

Technical Field

[0001] This utility model relates to the field of angle grinder technology, specifically a rounded corner grinder. Background Technology

[0002] Rounding grinders, indispensable surface finishing equipment in manufacturing, are specifically designed to create rounded transition angles of specific radii on the edges of metal, wood, and composite material workpieces. Their core working principle involves a motor-driven high-speed rotating grinding tool that uses mechanical friction to eliminate burrs, flash, and sharp angles generated during cutting, stamping, or casting, resulting in a smooth contour that meets safety standards and functional requirements. In the manufacturing of high-end products such as automotive body panel molds, aero-engine blade tenons, and precision instrument housings, the geometric accuracy and surface integrity of the rounded corners directly determine the fatigue strength, hydrodynamic performance, and assembly reliability of the components, making them a key quality indicator for measuring manufacturing quality.

[0003] While current mainstream handheld corner grinders offer the advantage of mobility, they face significant ergonomic challenges and precision control difficulties in actual operation. Operators must overcome the physical strain caused by the machine's weight and high-frequency vibrations, while precisely controlling three dimensions of motion parameters: the normal pressure applied to the workpiece surface, the movement trajectory of the grinding wheel along the edge, and the angle between the grinding wheel axis and the workpiece surface. Due to the lack of effective force feedback and path guidance mechanisms, manual operation inevitably produces significant deviations: pressure fluctuations lead to uneven grinding depth, trajectory deviations cause distortion of the rounded corner profile, and inaccurate angles result in transition zone collapse or residual edges. These problems are particularly prominent when working on large curved workpieces or during long-term continuous operation, severely restricting the stability of processing quality.

[0004] The aforementioned control deficiencies triggered a series of chain reactions and negative effects: Geometric precision deviations led to product malfunctions; for example, stress concentration caused the fatigue life at the sharp corners of the gearbox housing to plummet from 10^7 cycles to 10^5 cycles, increasing the risk of early fracture by 70%. Production economics deteriorated simultaneously, requiring a secondary polishing process to repair defects, and causing abnormal wear of the grinding wheel due to localized overload, resulting in an overall increase in unit processing costs of 28%-45%. More seriously, operators, while continuously resisting equipment vibration, endured vibration doses exceeding the ISO 5349 standard limit of 125% for extended periods, leading to an occupational carpal tunnel syndrome incidence rate of 22%. Uncontrolled grinders also easily caused grinding disc shattering and scattering accidents, posing a substantial threat to safe production. Utility Model Content

[0005] To address the problem that manual operation of current handheld corner grinders inevitably leads to significant deviations, resulting in uneven grinding depth and trajectory deviation causing distortion of the R-angle profile.

[0006] This utility model provides a rounded corner sander, including a wood milling machine. The milling cutter of the wood milling machine is a rounded corner milling cutter. A guide rail is fixedly installed on the sanding end of the wood milling machine. The extension direction of the guide rail is perpendicular to the rotation axis of the rounded corner milling cutter. A fixed frame is slidably installed on the guide rail.

[0007] The fixed frame includes a guide plate and multiple positioning pins. The guide plate is slidably mounted on the guide rail and slides back and forth along the guide rail. The positioning pins are fixedly mounted on the guide plate. The multiple positioning pins clamp and fix the workpiece to be processed, so that the corner position of the workpiece to be processed is fixed in the cutting area of ​​the rounded end mill.

[0008] As a preferred embodiment, the guide rail includes a top plate, multiple connecting columns, and a bottom plate that are fixedly connected in sequence, and the guide plate is provided with multiple guide holes that cooperate with the connecting columns.

[0009] As a preferred embodiment, the positioning post is fixed vertically downward on the guide plate, and several return springs are provided between the guide plate and the top plate, with the return springs sleeved on the outside of the connecting post.

[0010] As a preferred embodiment, the base plate is provided with a clearance groove, the contour of which is adapted to the geometry of the workpiece to be processed, so that the workpiece is positioned without interference.

[0011] As a preferred embodiment, the bakelite milling machine is a handheld bakelite milling machine with a handle fixedly mounted on its upper end.

[0012] As a preferred embodiment, the guide rail further includes a connecting plate and a bolt-type C-shaped clamp. The connecting plate has a through hole in the middle and is fitted onto the bakelite milling machine housing. The top plate and bottom plate are fixedly connected to the upper and lower ends of the connecting plate, respectively. The bolt-type C-shaped clamp is fixedly connected to the side of the connecting plate. The bolt-type C-shaped clamp detachably fixes the guide rail to the bakelite milling machine by radial locking force.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention utilizes a guide rail system perpendicular to the milling cutter axis, allowing a sliding guide plate to drive a fixed frame to clamp the workpiece along a straight feed, ensuring precise positioning of the workpiece's edges and corners within the milling cutter's cutting zone and significantly improving the accuracy of rounded corner machining. Multiple positioning pins combined with a contoured clearance groove design allow for quick clamping of rectangular and irregularly shaped workpieces. A return spring buffers cutting vibrations, preventing overcutting due to workpiece displacement, while the handle keeps the operator's hand away from the cutter head, completely eliminating the risk of cutting injuries. In practical applications in solid wood furniture processing, the yield rate reached 98.7%, with a processing efficiency of 30 pieces / hour and a surface roughness Ra < 3.2μm, providing a cost-effective and precise machining solution for small-batch, multi-variety production. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0016] Figure 1 This is a schematic diagram of the structure of the device;

[0017] Figure 2 This is a schematic diagram of the structure of the device in use;

[0018] The numbers in the attached diagram are:

[0019] in,

[0020] 1. Bakelite milling cutter; 2. Rounded corner milling cutter; 3. Guide rail; 31. Top plate; 32. Connecting post; 33. Base plate; 34. Clearance groove; 35. Connecting plate; 36. Bolt type; C-shaped clamp; 4. Fixing bracket; 41. Guide plate; 42. Positioning post; 5. Return spring; 6. Handle. Detailed Implementation

[0021] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0022] Example 1:

[0023] Please see Figures 1 to 2 This embodiment presents a corner sander as shown in the figure, including a bakelite milling machine 1. The milling cutter of the bakelite milling machine 1 is a corner milling cutter 2. A guide rail 3 is fixedly mounted on the sanding end of the bakelite milling machine 1, and the extension direction of the guide rail 3 is perpendicular to the rotation axis of the corner milling cutter 2. A fixing frame 4 is slidably mounted on the guide rail 3.

[0024] The guide rail 3 has the following structure: a top plate 31, a bottom plate 33, three connecting posts 32 connecting the top plate 31 and the bottom plate 33, a connecting plate 35, and bolt-type C-shaped clamps 36. The three connecting posts 32 are arranged in an equilateral triangle, and two connecting posts 32 are located on both sides of the rounded end mill 2. A clearance groove 34 is provided in the middle of the bottom plate 33. The contour shape of the clearance groove 34 matches the geometry of the workpiece to be processed, ensuring no interference during workpiece positioning. A through hole is provided in the middle of the connecting plate 35, which is fitted onto the housing of the bakelite milling machine 1. The upper end of the connecting plate 35 is fixedly connected to the top plate 31, and the lower end is fixedly connected to the bottom plate 33. Bolt-type C-shaped clamps 36 are fixedly connected to the side of the connecting plate 35. These bolt-type C-shaped clamps 36 detachably fix the guide rail 3 to the housing of the bakelite milling machine 1 by applying radial locking force.

[0025] The fixing frame 4 includes a guide plate 41 and four positioning posts 42. The guide plate 41 is a right-angled triangular plate with two guide holes. These guide holes are respectively fitted onto one side of the milling cutter and the outermost connecting post 32, allowing the guide plate 41 to slide back and forth along the connecting post 32. The positioning posts 42 are fixed vertically downward on the two right-angled sides of the guide plate 41, with two posts on each right-angled side, respectively fitting against the two sides of the workpiece to be processed, thereby fixing the workpiece and ensuring that the edges and corners of the workpiece are precisely located within the cutting area of ​​the fillet milling cutter 2. Two return springs 5 ​​are provided between the guide plate 41 and the top plate 31. These return springs 5 ​​are respectively fitted onto the outer side of the corresponding connecting post 32 of the connecting guide plate 41, providing return spring force.

[0026] This structure, through the cooperation of guide rail 3, fixing frame 4 and positioning post 42, achieves precise positioning and stable feed of the workpiece corners relative to the fillet milling cutter 2. A handle 6 is fixedly installed at the upper end of the bakelite milling machine 1 for easy hand operation.

[0027] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A corner sander, comprising a bakelite milling machine (1), wherein the milling cutter of the bakelite milling machine (1) is a corner milling cutter (2), characterized in that: The grinding end of the bakelite milling cutter (1) is fixedly equipped with a guide rail (3). The extension direction of the guide rail (3) is perpendicular to the rotation axis of the rounded end mill (2). A fixed bracket (4) is slidably installed on the guide rail (3). The fixed frame (4) includes a guide plate (41) and multiple positioning pins (42). The guide plate (41) is slidably mounted on the guide rail (3) and slides back and forth along the guide rail (3). The positioning pins (42) are fixedly mounted on the guide plate (41). The multiple positioning pins (42) clamp and fix the workpiece to be processed, so that the corner position of the workpiece is fixed in the cutting area of ​​the rounded end mill (2).

2. The bullnose sander of claim 1, wherein: The guide rail (3) includes a top plate (31), multiple connecting columns (32) and a bottom plate (33) that are fixedly connected in sequence. The guide plate (41) is provided with multiple guide holes that cooperate with the connecting columns (32).

3. The bullnose sander of claim 2, wherein: The positioning post (42) is fixed vertically downward on the guide plate (41), and a number of reset springs (5) are provided between the guide plate (41) and the top plate (31). The reset springs (5) are sleeved on the outside of the connecting post (32).

4. The bullnose sander of claim 3, wherein: The base plate (33) has a clearance groove (34), the outline of which is adapted to the geometry of the workpiece to be processed, so that the workpiece is positioned without interference.

5. The bullnose sander of claim 1, wherein: The bakelite milling machine (1) is a handheld bakelite milling machine, and a handle (6) is fixedly installed on the upper end of the bakelite milling machine (1).

6. The corner polishing machine according to claim 2, characterized in that: The guide rail (3) also includes a connecting plate (35) and a bolt-type C-shaped clamp (36). The connecting plate (35) has a through hole in the middle and is fitted onto the outer shell of the bakelite milling machine (1). The upper and lower ends of the connecting plate (35) are respectively fixedly connected to the top plate (31) and the bottom plate (33). The side of the connecting plate (35) is fixedly connected to the bolt-type C-shaped clamp (36). The bolt-type C-shaped clamp (36) detachably fixes the guide rail (3) to the bakelite milling machine (1) by radial locking force.

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