Middle cutter bar of lathe

Abstract

The utility model relates to a middle cutter bar of a lathe. The middle cutter bar comprises a main bar, an auxiliary bar and a middle bar, the main rod is a slender hard rod, the auxiliary rods are thicker than the two ends of the main rod and are consistent in diameter, the diameter of the middle rod is larger than that of the auxiliary rods, and the main rod and the middle rod are located in the middle of the main rod, at the joint of the main rod and the auxiliary rods and at the joint of the main rod and the middle rod and located on the same horizontal line. Multifunctional machining is achieved through a specific structure, machining of a boss face and a brake face of a brake disc is achieved through a single middle cutter bar, the machining efficiency is improved, the working procedure machining is shortened, the cutter changing time is shortened, the device is suitable for medium and small batch production, and the connecting positions of a main bar, a middle bar and an auxiliary bar are in fillet transition; the center line of the main rod and the center line of the middle rod are offset from the center line of the auxiliary rod, the included angle range is specific, the machining flexibility is improved, a cutter pad and a blade groove are gapless, heat treatment HRC40-50 is conducted, the surface of the cutter rod is blackened, and the cutter rod is provided with an alloy pressing plate in an inlaid mode.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe tool bar equipment, in particular to a center-mounted tool bar for a lathe. Background Art

[0002] Lathe toolholders, essential for connecting machine tools to cutting tools, are equipped with blades at their tips, securing the tool and enabling precise cutting. Lathe toolholders play a crucial role in lathe machining, improving efficiency while ensuring precision and surface finish. Currently, the industry typically uses two toolholders to turn the high and low profile bosses of brake discs, requiring two passes. This directly impacts machining efficiency and results in low output.

[0003] For example, the authorized patent document with application number CN202220118236.5 discloses a lathe tool rod, which relates to the field of mechanical processing equipment. It includes a lathe body, a tool, a tool rod and a clamping assembly. One end of the tool rod is rotatably connected to the tool holder of the lathe body, and the other end is connected to the three-jaw chuck of the lathe body through a clamping assembly. The tool is detachably connected to the end of the tool rod away from the tool holder. This application has the effect of facilitating the processing of extra-large disc apertures.

[0004] The above patent is that the turning of the high and low parts of the boss surface of the brake disc is generally completed by two turning tool rods, which requires two tool passes to achieve, directly affecting the processing efficiency and resulting in low output. Therefore, we need to provide a lathe center tool rod. Utility Model Content

[0005] The purpose of the present invention is to provide a lathe center tool bar, a main bar, an auxiliary bar and an intermediate bar, which realize multifunctional processing through a specific structure. A single center tool bar can realize the processing of the brake disc boss and the brake surface, improve processing efficiency, reduce process processing, and eliminate tool change time. It is suitable for small and medium-sized batch production. The connection between the main bar, the intermediate bar and the auxiliary bar adopts a rounded transition; the center lines of the main bar, the intermediate bar and the auxiliary bar are offset, and the angle range is specific, which improves processing flexibility and solves the problem proposed in the above background technology that the high and low parts of the brake disc boss are generally processed by two turning tool bars, which requires two tool passes to achieve, directly affecting processing efficiency and resulting in low output.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a center-mounted tool bar for a lathe, comprising:

[0007] Main pole, auxiliary pole and intermediate pole;

[0008] The main rod is a slender and rigid rod, the auxiliary rod is thicker than the two ends of the main rod and has the same diameter, the diameter of the intermediate rod is larger than the diameter of the auxiliary rod and is located in the middle of the main rod. The main rod and the auxiliary rod are connected, and the main rod and the intermediate rod are connected. The main rod and the intermediate rod are located on the same horizontal line.

[0009] Preferably, the connection between the intermediate rod and the main rod is transitioned with a rounded corner, and the transition rounded corner radius ranges from 2r to 3r, where r is the diameter of the rod.

[0010] Preferably, the radius of the transition arc at the connection between the auxiliary rod and the main rod is the same as .

[0011] Preferably, the center lines of the main rod and the intermediate rod are offset from the center line of the auxiliary rod, the angle between the main rod and the auxiliary rod is in the range of 130-160 degrees, and the angle between the intermediate rod and the auxiliary rod is in the range of 50-70 degrees.

[0012] Preferably, the intermediate rod is longer than the main rod, the intermediate rod exceeds the main rod by 5-12 mm, and the auxiliary rod exceeds the main rod by 6-12 mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The main rod, auxiliary rod and intermediate rod of the utility model realize multifunctional processing through a specific structure. A single central tool rod realizes the processing of the brake disc boss surface and the braking surface, improves processing efficiency, reduces process processing, eliminates tool change time, and is suitable for small and medium-sized batch production. The connection between the main rod, the intermediate rod and the auxiliary rod adopts a rounded transition; the center lines of the main rod, the intermediate rod and the auxiliary rod are offset, and the angle range is specific, which improves processing flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the installation diagram of the center-mounted cutter bar of the present utility model;

[0016] Figure 2 This is a cross-sectional view of the main rod of the present utility model;

[0017] Figure 3 This is a front view of the structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the application processing of the utility model.

[0019] In the figure: 1. Main rod; 2. Auxiliary rod; 3. Middle rod; 4. Rounded corner. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4 The utility model provides a technical solution: a lathe center-mounted tool bar, comprising:

[0022] Main rod 1, auxiliary rod 2 and intermediate rod 3;

[0023] The main rod 1 is a slender and rigid rod, the auxiliary rod 2 is thicker than the two ends of the main rod 1, and the diameters are the same. The diameter of the intermediate rod 3 is larger than the diameter of the auxiliary rod 2. It is located in the middle of the main rod 1, where the main rod 1 and the auxiliary rod 2 are connected, and where the main rod 1 and the intermediate rod 3 are connected, the main rod 1 and the intermediate rod 3 are located on the same horizontal line.

[0024] The connection between the intermediate rod 3 and the main rod 1 is transitioned with a fillet 4, and the radius of the transition fillet 4 ranges from 2r to 3r, where r is the diameter of the rod;

[0025] In this embodiment, the sharp edge is blunted, and the chamfer C0.5 is not added. After the blade is pressed, there is no gap between the blade and the blade slot, and there is no gap between the tool pad and the blade slot. The heat treatment is HRC40-50, the surface of the tool bar is blackened, and the tool bar is equipped with an alloy pressure plate with specifications of 16X30X20, the tool bar model CCDNN3225P12, and the blade model CNMN120712. The tool path is optimized and the number of tool bars is reduced; the processing efficiency is improved and the frequency of tool changes is reduced; after the use of the center tool bar, the unstable factors in the processing process such as dimensional deviation, tool vibration, and tool chattering caused by tool changes are reduced, so that the processed product has excellent dimensional stability.

[0026] The radius of the transition arc at the connection between the auxiliary rod 2 and the main rod 1 is the same as;

[0027] Specifically, the radius of the transition arc at the connection between the auxiliary rod 2 and the main rod 1 is the same, which not only improves the strength and stability of the structure, but also optimizes the overall performance. The design of the transition arc can effectively disperse the stress at the connection and avoid the occurrence of stress concentration; this helps to reduce the risk of damage to the structure when it is under load and improve the overall bearing capacity; improve fatigue life; by optimizing the radius of the transition arc, fatigue damage caused by stress concentration at the connection can be reduced; this makes the structure more durable during long-term use and reduces the frequency of maintenance and replacement. The design of the transition arc makes the processing and manufacturing process smoother and reduces the processing difficulty and cost caused by stress concentration; this also improves processing accuracy and product quality; enhances structural stability; the transition arc can enhance the overall stability of the structure, making it safer and more reliable when bearing complex loads; the center lines of the main rod 1 and the intermediate rod 3 are offset from the center line of the auxiliary rod 2, and the angle between the main rod 1 and the auxiliary rod 2 is in the range of 130-160 degrees, and the angle between the intermediate rod 3 and the auxiliary rod 2 is in the range of 50-70 degrees.

[0028] The length of the intermediate rod 3 is longer than the main rod 1, the intermediate rod 3 extends beyond the main rod by 15-12 mm, and the auxiliary rod 2 extends beyond the main rod by 16-12 mm;

[0029] It should be noted that a longer intermediate rod 3 can more easily accommodate workpieces of varying lengths and processing requirements. This allows the lathe to process a wider variety of workpieces, enhancing its versatility and flexibility. Easier cutting position adjustment: A longer intermediate rod 3 provides greater flexibility for adjusting the cutting position. Operators can flexibly adjust the cutting point to suit different processing requirements. In some cases, a longer intermediate rod 3 can better absorb vibrations generated during the cutting process. This helps reduce cutting noise, improve cutting accuracy, and enhance surface finish. Improved cutting stability: A longer intermediate rod 3 better balances cutting forces and tool rigidity, thereby improving cutting stability. This helps reduce tool wear and damage, extending tool life. A longer intermediate rod 3 better distributes stress generated during cutting and reduces stress on joints. This helps reduce wear and damage at joints, improving the strength and durability of the overall structure. A longer intermediate rod 3 also enhances its torsional resistance. This helps prevent tool damage or breakage caused by excessive torque during cutting.

[0030] Among them, the material is put through a heat treatment process to reach a Rockwell hardness (HRC) range of 40 to 50, and its surface hardness is significantly improved, thereby enhancing its ability to resist wear. During the cutting process, the friction between the tool and the workpiece will cause wear, and high-hardness lathe tool bars can more effectively resist this wear and extend the service life of the tool. The cutting edge of the heat-treated lathe tool bar can remain sharp for a longer time. This is because high-hardness materials are not easy to deform during cutting and can more stably maintain the shape and size of the cutting edge, thereby improving cutting efficiency and processing accuracy. Lathe tool bars that have been heat-treated to a hardness range of HRC40-50 are suitable for cutting a variety of materials, including some materials with higher hardness. This makes the application range of lathe tool bars wider and can meet different processing needs;

[0031] The ferroferric oxide film formed by the blackening treatment of the lathe tool bar can isolate the air and effectively prevent the surface of the lathe tool bar from being corroded; Enhanced wear resistance: The surface hardness of the tool bar after blackening treatment is increased, and the wear resistance is significantly improved, which extends the service life of the tool bar; Improved aesthetics: The surface of the lathe tool bar after blackening treatment presents a uniform black or blue-black color, which improves the aesthetics of the product; Reduced maintenance costs: Since the blackening treatment improves the corrosion resistance and wear resistance of the tool bar, the frequency of repairs and replacements due to corrosion and wear is reduced, thereby reducing maintenance costs.

[0032] This device has blunted sharp edges and no C0.5 chamfer. After the blade is pressed, there is no gap between the blade and the blade slot, and there is no gap between the shim and the blade slot. It is heat treated to HRC40-50, the surface of the tool bar is blackened, and the tool bar is equipped with an alloy pressure plate. The specification is 16X30X20, the tool bar model is CCDNN3225P12, and the blade model is CNMN120712. It optimizes the tool path and reduces the number of tool bars; improves processing efficiency and reduces the frequency of tool changes; after using the center tool bar, it reduces the unstable factors in the processing process such as dimensional deviation, tool chatter, and tool vibration caused by tool changes, so that the processed products have excellent dimensional stability.

[0033] like Figure 4 The original processing diagram shown is that the brake surface (a) is processed from left to right using the tool holder (B), and the boss surface (b) is processed from right to left using the tool holder (A).

[0034] By adjusting the tool bar structure, one tool can be used for machining. The diagram shows that the brake surface (a) and the boss surface (b) are machined from right to left using the tool bar (C). During machining, both the brake surface (a) and the boss surface (b) can be taken into consideration at the same time, thereby improving machining efficiency.

[0035] A is a normal tool arbor; B is a normal tool arbor; C is a center tool arbor; a is the braking surface; b is the boss petal surface.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lathe with a central tool bar, characterized in that: include: A main rod (1), an auxiliary rod (2) and an intermediate rod (3); The main rod (1) is a slender and rigid rod; the auxiliary rod (2) is thicker than both ends of the main rod (1) and has the same diameter; the intermediate rod (3) has a diameter larger than that of the auxiliary rod (2) and is located in the middle of the main rod (1); the main rod (1) and the intermediate rod (3) are located on the same horizontal line at the connection point between the main rod (1) and the auxiliary rod (2) and the connection point between the main rod (1) and the intermediate rod (3).

2. The center-mounted tool bar of a lathe according to claim 1, characterized in that: The connection between the intermediate rod (3) and the main rod (1) is transitioned by a fillet (4), and the radius of the transition fillet (4) ranges from 2r to 3r, where r is the diameter of the rod.

3. The center-mounted tool bar of a lathe according to claim 1, characterized in that: The radius of the transition arc at the connection between the auxiliary rod (2) and the main rod (1) is the same as that of the auxiliary rod (2).

4. The center-mounted tool bar of a lathe according to claim 1, characterized in that: The center lines of the main rod (1) and the intermediate rod (3) are offset from the center line of the auxiliary rod (2); the angle between the main rod (1) and the auxiliary rod (2) is in the range of 130-160 degrees, and the angle between the intermediate rod (3) and the auxiliary rod (2) is in the range of 50-70 degrees.

5. The center-mounted tool bar of a lathe according to claim 1, characterized in that: The intermediate rod (3) is longer than the main rod (1), the intermediate rod (3) extends beyond the main rod (1) by 5-12 mm, and the auxiliary rod (2) extends beyond the main rod (1) by 6-12 mm.

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