A speed increasing device for a traditional heavy-duty low-speed boring and milling machine and its use method

Abstract

The present invention provides a speed-increasing device and method for use in conventional heavy-duty, low-speed boring and milling machines. The device comprises a high-speed electric spindle, the output shaft of which is mounted with a tool chuck for clamping a tool. The high-speed electric spindle is fixedly mounted within a spindle holder, the rear end of which is connected to a milling cutter shank via flange bolts. The milling cutter shank is matingly connected to the spindle of the boring and milling machine. This device solves the problem of insufficient tool performance and low machining efficiency when using small-diameter carbide tools in conventional heavy-duty, low-speed boring and milling machines. It effectively improves machining efficiency, stabilizes machining quality, and achieves a low input-output ratio, resulting in excellent economic benefits.

Description

Technical Field

[0001] The invention relates to a speed increasing device for a traditional heavy-duty low-speed boring and milling machine and a use method thereof, belonging to the field of cutting processing in mechanical manufacturing. Background Art

[0002] In the field of mechanical processing, traditional heavy-duty, low-speed boring and milling machines are characterized by low speed and high torque, and are primarily focused on heavy-duty cutting. Nowadays, it is particularly difficult to use small-diameter carbide tools to process small-sized processing elements in large products, and it is even difficult to meet the requirements. There is an urgent need to increase the spindle speed. With the increasing application of high-speed cutting, although there are many spindle speed increasers on the market that are compatible with low-speed boring and milling equipment, both gear-type spindle speed increasers and pneumatic tool holders have the characteristics of low torque, small clamping tool diameter (1 to 13mm), and high procurement costs. The expensive spindle speed increasers on the market have a high input-output ratio for traditional heavy-duty boring and milling machines that do not frequently use small-diameter tool processing, and the economic benefits are not significant. However, spindle motors with simple structure, small size, light weight, and high speed are more suitable for small-diameter tool processing and have now formed standardized production. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to provide a speed increasing device and a method of use for a traditional heavy-duty low-speed boring and milling machine, which solves the problem that when traditional heavy-duty low-speed boring and milling machines use small-diameter carbide tools for processing, the tool performance cannot be fully utilized and the processing efficiency is low. It effectively improves the processing efficiency, stabilizes the processing quality, and has a low input-output ratio and good economic effect.

[0004] In order to achieve the above-mentioned technical features, the purpose of the present invention is achieved as follows: a speed increasing device for a traditional heavy-duty low-speed boring and milling machine, which includes a high-speed electric spindle, the output shaft of the high-speed electric spindle is equipped with a tool chuck for clamping the tool, the high-speed electric spindle is fixedly installed inside the spindle fixing seat, the tail of the spindle fixing seat is connected to the milling cutter shank through a flange bolt, and the milling cutter shank is connected to the spindle of the boring and milling machine.

[0005] The power of the high-speed electric spindle is at least 5.5Kw, and the maximum spindle speed of the high-speed electric spindle is 24000r / min.

[0006] The spindle fixing seat includes a first semi-arc sleeve and a second semi-arc sleeve that are symmetrically connected in combination. The mating surfaces of the first semi-arc sleeve and the second semi-arc sleeve are processed with a split surface, and the mating surfaces of the first semi-arc sleeve and the second semi-arc sleeve are processed with bolt mating holes for installing connecting bolts. The end heads of the first semi-arc sleeve and the second semi-arc sleeve are provided with flange plates, and the flange plates are evenly processed with flange holes in a circumferential manner.

[0007] A through hole is processed on the first semi-arc sleeve and the second semi-arc sleeve near the end where the flange plate is located.

[0008] The wire hole is used for passing a power line connected to a high-speed electric spindle and a cooling water pipe for cooling a tool.

[0009] The flange plate is fixedly connected to the milling cutter handle via flange bolts.

[0010] The bolt matching holes include tangential bolt holes processed on the first semi-arc sleeve and tangential through holes processed on the second semi-arc sleeve, or tangential through holes processed on the first semi-arc sleeve and tangential bolt holes processed on the second semi-arc sleeve. The tangential bolt holes and tangential through holes cooperate with the connecting bolts to realize the combined connection of the first semi-arc sleeve and the second semi-arc sleeve.

[0011] The outer end surface of the flange plate is processed with a keyway along the direction of the split surface, and the keyway is matched with the keyway of the matching end surface of the milling cutter handle through a flat key.

[0012] The tool chuck adopts an ER chuck, which is used to clamp tools with a diameter of Φ1mm to Φ20mm.

[0013] A method for using a speed increasing device for a conventional heavy-duty low-speed boring and milling machine comprises the following steps:

[0014] Step 1, select high-speed electric spindle:

[0015] According to the size of the tool to be installed and the material to be processed, the required power of the high-speed electric spindle is calculated according to the milling power formula: Pc=Kc×Ap×Ae×Vf / (60×1000×1000). Then, based on the usage power not exceeding 50% of the total power, the total power of the high-speed electric spindle required is calculated, and finally a high-speed electric spindle with corresponding parameters is selected; among them, Pc is the milling power, unit is Kw; Kc is the specific cutting force, unit is N / mm 2 ; Vf is cutting speed, unit is mm / min; Ap is cutting depth, unit is mm; Ae is cutting width, unit is mm;

[0016] Step 2, design of the spindle fixing seat:

[0017] According to the basic size parameters of the high-speed electric spindle selected in step 1, design the corresponding spindle fixing seat, and ensure that the spindle fixing seat can clamp the high-speed electric spindle and at the same time ensure that the spindle fixing seat can be fixedly connected to the milling cutter handle of the boring and milling machine;

[0018] Step 3: Assemble the speed increasing device:

[0019] The high-speed electric spindle, the spindle fixing seat and the milling cutter handle are fixedly connected to form the spindle speed increasing device of the boring and milling machine, which specifically includes the following steps:

[0020] Step 3.1: Connect the corresponding power supply and cooling water pipelines to the tail of the high-speed electric spindle, insert the entire high-speed electric spindle into the inner cavity of the spindle holder, and clamp the spindle holder;

[0021] Step 3.2: Use flange bolts to securely connect the spindle holder to the milling cutter shank, thereby forming the main connecting component of the speed increasing device.

[0022] Step 3.3: Install a pull pin on the end of the milling cutter shank and equip the corresponding frequency converter and cooling water pump with a quick-change interface to form a complete spindle speed increase device.

[0023] Step 4: Install the spindle speed increaser on the boring and milling machine and use the high-speed electric spindle to achieve high-speed machining of small-diameter tools:

[0024] Step 4.1, install the spindle speed increasing device to the spindle taper hole of the boring and milling machine;

[0025] Step 4.2, install the tool on the tool chuck;

[0026] Step 4.3: Operate the controller of the high-speed electric spindle to drive the tool to rotate, accelerate, decelerate, and stop;

[0027] Step 4.4: Operate the coordinate axis of the machine tool to achieve rapid movement, feed, and retract to complete the corresponding processing.

[0028] The present invention has the following beneficial effects:

[0029] 1. The present invention has a simple structure and is easy to install. The spindle motor with a tool clamping unit can be connected to the spindle of a low-speed boring and milling machine only through the spindle fixing seat and the universal tool tail handle, achieving fast and convenient installation.

[0030] 2. The high-speed electric spindle of this invention offers high spindle speed, moderate power, and the ability to clamp a wide range of tools. Depending on the selected spindle motor, the spindle speed can reach up to 24,000 rpm, dozens of times faster than conventional low-speed boring and milling machine spindles. The ER chuck can clamp tools with diameters ranging from 1mm to 20mm, making it suitable for high-speed machining of carbide tools within this diameter range.

[0031] 3. The present invention has high processing efficiency and good surface quality. Compared with traditional low-speed boring and milling machines, when using small-diameter tools, as the cutting speed increases, the tool's performance advantages are fully utilized, and its efficiency is improved by more than 1.5 times; the processing surface quality is improved from Ra3.2 to Ra1.6.

[0032] 4. This invention offers a low input-output ratio and significant economic benefits. This speed-increasing device is easy to produce and has a low manufacturing cost, costing approximately 20% of similar speed-increasing devices on the market. It has been successfully used in the processing of the sealing grooves on the split face of our product X and product Y, enabling smooth and efficient production and achieving excellent economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and examples.

[0034] Figure 1 This is the overall structural diagram of the present invention.

[0035] Figure 2 This is the front view of the spindle fixing seat of the present invention.

[0036] Figure 3 For the present invention Figure 2 Medium AA view.

[0037] Figure 4 For the present invention Figure 2 Middle BB view.

[0038] Figure 5 For the present invention Figure 2 Middle CC view.

[0039] Figure 6 For the present invention Figure 3 Middle D is a partial enlarged view.

[0040] Figure 7 This is a structural diagram of the flange bolts of the present invention.

[0041] Figure 8 This is a structural diagram of the connecting bolts of the present invention.

[0042] Figure 9 This is a process diagram of the faceted sealing groove of the X product processed by the present invention.

[0043] Figure 10 This is a process diagram of the split surface sealing groove of the Y product processed by the present invention.

[0044] In the figure: high-speed electric spindle 1, spindle fixing base 2, milling cutter handle 3, flange bolt 4, tool chuck 5, connecting bolt 6;

[0045] First semi-arc sleeve 201, second semi-arc sleeve 202, split surface 203, wire hole 204, keyway 205, flange plate 206, bolt matching hole 207, flange hole 208, tangential through hole 209, tangential bolt hole 210. DETAILED DESCRIPTION

[0046] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0047] Example 1:

[0048] See also Figure 1-10 , a speed increasing device for a traditional heavy-duty low-speed boring and milling machine, comprising a high-speed electric spindle 1, wherein the output shaft of the high-speed electric spindle 1 is equipped with a tool chuck 5 for clamping a tool, the high-speed electric spindle 1 is fixedly mounted inside a spindle fixing seat 2, the tail of the spindle fixing seat 2 is connected to a milling cutter shank 3 via a flange bolt 4, and the milling cutter shank 3 is cooperatively connected to the spindle of the boring and milling machine. By adopting the speed increasing device of the present invention, the problem that the traditional heavy-duty low-speed boring and milling machine cannot give full play to the tool performance and has low processing efficiency when using small-diameter carbide cutting tools for processing is solved, the processing efficiency is effectively improved, the processing quality is stabilized, the input-output ratio is low, and the economic effect is good. In the specific working process, the milling cutter shank 3 is driven by the boring and milling machine, the spindle fixing seat 2 is driven by the milling cutter shank 3, the high-speed electric spindle 1 is driven by the spindle fixing seat 2, the tool chuck 5 is driven by the high-speed electric spindle 1, and the tool is driven by the tool chuck 5 to perform boring and milling processing.

[0049] Furthermore, the power of the high-speed electric spindle 1 is at least 5.5 kW, and the maximum spindle speed of the high-speed electric spindle 1 is 24,000 rpm. By adopting the above power and spindle speed, high-speed processing of large workpieces can be achieved.

[0050] Furthermore, the spindle fixing seat 2 includes a first semi-arc sleeve 201 and a second semi-arc sleeve 202 that are symmetrically connected. The mating surfaces of the first semi-arc sleeve 201 and the second semi-arc sleeve 202 are machined with a split surface 203. The mating surfaces of the first semi-arc sleeve 201 and the second semi-arc sleeve 202 are machined with bolt mating holes 207 for installing the connecting bolts 6. The ends of the first semi-arc sleeve 201 and the second semi-arc sleeve 202 are provided with flange plates 206, and the flange plates 206 are uniformly machined with flange holes 208 in a circumferential manner. The spindle fixing seat 2 can reliably clamp and fix the high-speed electric spindle 1, thereby achieving reliable connection between the high-speed electric spindle 1 and the existing heavy-duty low-speed boring and milling machine. During the specific installation process, the high-speed electric spindle 1 is clamped and fixed by combining the first semi-arc sleeve 201 and the second semi-arc sleeve 202 and then fixing the high-speed electric spindle 1 between the first semi-arc sleeve 201 and the second semi-arc sleeve 202.

[0051] Furthermore, a wire hole 204 is formed on the first and second semi-arc sleeves 201, 202 near the flange plate 206. The wire hole 204 facilitates connecting the high-speed electric spindle 1 to a power line, thereby supplying power to the high-speed electric spindle 1 and providing electrical energy.

[0052] Furthermore, the wire hole 204 is used to pass a power line connected to the high-speed electric spindle 1 and a cooling water pipe for cooling the tool.

[0053] Furthermore, the flange plate 206 is fixedly connected to the milling cutter handle 3 via flange bolts 4. The reliability of the connection with the milling cutter handle 3 is ensured by the above-mentioned flange connection.

[0054] Furthermore, the bolt-matching holes 207 include tangential bolt holes 210 machined on the first semi-arc sleeve 201 and tangential through holes 209 machined on the second semi-arc sleeve 202, or tangential through holes 209 machined on the first semi-arc sleeve 201 and tangential bolt holes 210 machined on the second semi-arc sleeve 202. The tangential bolt holes 210 and tangential through holes 209 cooperate with the connecting bolts 6 to achieve the combined connection between the first semi-arc sleeve 201 and the second semi-arc sleeve 202. The bolt-matching holes 207 described above enable a reliable combined connection between the first semi-arc sleeve 201 and the second semi-arc sleeve 202.

[0055] Furthermore, a keyway 205 is machined on the outer end surface of the flange plate 206 along the direction of the split plane 203, and the keyway 205 is mated with the keyway on the mating end surface of the milling cutter shank 3 via a flat key. Through the above flat key mating, reliable transmission of torque can be achieved.

[0056] Furthermore, the tool chuck 5 is an ER chuck for clamping tools with a diameter of Φ1mm to Φ20mm. The ER chuck enhances its adaptability and is thus suitable for clamping and fixing tools of different sizes.

[0057] Example 2:

[0058] The high-speed electric spindle 1 on the market is a separate individual with a tool clamping unit. It can directly drive the spindle to perform high-speed rotation through a driving power supply. According to the structure and performance characteristics of the spindle motor, the spindle motor is designed and manufactured to simply and conveniently connect to the spindle fixing seat 2 of the CNC boring and milling machine spindle, thereby realizing the connection of the high-speed electric spindle 1.

[0059] Example 3:

[0060] Based on the current equipment processing situation, the main issue is the application of tools Φ20 and smaller. For example, a Φ20 square shoulder milling cutter machining SC450 material: According to the milling power formula Pc = Kc × Ap × Ae × Vf / (60 × 1000 × 1000), Kc = 2710, Ap = 1mm, Ae = 20mm, Vf = 3000mm / min; the power is calculated to be 2.71kW. If the long-term power does not exceed 50% of the total power, the required total motor power is approximately 5.42kW. Therefore, a spindle motor with a power of at least 5.5kW and a maximum spindle speed of 24,000r / min is selected.

[0061] Example 4:

[0062] A method for using a speed increasing device for a conventional heavy-duty low-speed boring and milling machine comprises the following steps:

[0063] Step 1, select high-speed electric spindle 1:

[0064] According to the size of the tool to be installed and the material to be processed, the required power of the high-speed electric spindle 1 is calculated according to the milling power formula: Pc=Kc×Ap×Ae×Vf / (60×1000×1000). Then, based on the fact that the used power does not exceed 50% of the total power, the total power of the high-speed electric spindle 1 required is calculated, and finally the high-speed electric spindle 1 with corresponding parameters is selected; among them, Pc is the milling power, unit is Kw; Kc is the specific cutting force, unit is N / mm 2 ; Vf is cutting speed, unit is mm / min; Ap is cutting depth, unit is mm; Ae is cutting width, unit is mm;

[0065] In this embodiment, the high-speed spindle parameters are 7.5Kw, 24000r / min;

[0066] Step 2, design of the spindle fixing seat 2:

[0067] According to the basic dimensional parameters of the high-speed electric spindle 1 selected in step 1, the corresponding spindle fixing base 2 is designed, and the spindle fixing base 2 is capable of clamping and fixing the high-speed electric spindle 1, while ensuring that the spindle fixing base 2 can be fixedly connected to the milling cutter shank 3 of the boring and milling machine;

[0068] Step 3: Assemble the speed increasing device:

[0069] The high-speed electric spindle 1, the spindle fixing seat 2 and the milling cutter handle 3 are fixedly connected to form a spindle speed increasing device of a boring and milling machine, which specifically includes the following steps:

[0070] Step 3.1: Connect the corresponding power supply and cooling water pipelines to the rear end of the high-speed electric spindle 1, insert the entire high-speed electric spindle 1 into the inner cavity of the spindle fixing base 2, and clamp the spindle fixing base 2;

[0071] Step 3.2: Use flange bolts 4 to securely connect the spindle holder 2 and the milling cutter handle 3, thereby forming the main connecting component of the speed increasing device;

[0072] Step 3.3: Install a pull pin on the tail of the milling cutter handle 3, and equip the corresponding frequency converter and cooling water pump with a quick-change interface to form a complete spindle speed increase device;

[0073] Step 4: Install the spindle speed increaser on the boring and milling machine and use the high-speed electric spindle 1 to achieve high-speed machining of small-diameter tools:

[0074] Step 4.1, install the spindle speed increasing device to the spindle taper hole of the boring and milling machine;

[0075] Step 4.2, installing the tool on the tool chuck 5;

[0076] Step 4.3: Operate the controller of the high-speed electric spindle 1 to drive the tool to rotate, accelerate, decelerate, and stop;

[0077] Step 4.4: Operate the coordinate axis of the machine tool to achieve rapid movement, feed, and retract to complete the corresponding processing.

Claims

1. A method for using a speed increasing device for a conventional heavy-duty low-speed boring and milling machine, the speed increasing device for a conventional heavy-duty low-speed boring and milling machine comprising a high-speed electric spindle (1), an output shaft of the high-speed electric spindle (1) being provided with a tool chuck (5) for clamping a tool, the high-speed electric spindle (1) being fixedly mounted inside a spindle fixing seat (2), a tail portion of the spindle fixing seat (2) being connected to a milling cutter shank (3) via a flange bolt (4), and the milling cutter shank (3) being cooperatively connected to the spindle of the boring and milling machine; It is characterized by: The method of use comprises the following steps: Step 1, select high-speed electric spindle (1): According to the size of the tool to be installed and the material to be processed, the required power of the high-speed electric spindle (1) is calculated according to the milling power formula: Pc=Kc×Ap×Ae×Vf / (60×1000×1000), and then the total power of the high-speed electric spindle (1) required is calculated based on the power usage not exceeding 50% of the total power, and finally the high-speed electric spindle (1) with corresponding parameters is selected; wherein Pc is the milling power, unit is Kw; Kc is the specific cutting force, unit is N / mm 2 ; Vf is cutting speed, unit is mm / min; Ap is cutting depth, unit is mm; Ae is cutting width, unit is mm; Step 2, design of the spindle holder (2): According to the basic size parameters of the high-speed electric spindle (1) selected in step 1, a corresponding spindle fixing seat (2) is designed, and the spindle fixing seat (2) is capable of clamping and fixing the high-speed electric spindle (1), while ensuring that the spindle fixing seat (2) can be fixedly connected to the milling cutter handle (3) of the boring and milling machine; Step 3: Assemble the speed increasing device: The high-speed electric spindle (1), the spindle fixing seat (2) and the milling cutter handle (3) are fixedly connected to form a spindle speed increasing device of a boring and milling machine, which specifically includes the following steps: Step 3.1, connect the corresponding power supply and cooling water pipelines to the tail of the high-speed electric spindle (1), insert the entire high-speed electric spindle (1) into the inner cavity of the spindle fixing seat (2), and clamp the spindle fixing seat (2); Step 3.2, using flange bolts (4) to fix the spindle fixing seat (2) and the milling cutter handle (3) together, thereby forming the main connecting component of the speed increasing device; Step 3.3, install a pull nail on the tail of the milling cutter handle (3), and equip the corresponding frequency converter and cooling water pump with a quick-change interface connection to form a complete spindle speed increase device; Step 4: Install the spindle speed increasing device on the boring and milling machine and use the high-speed electric spindle (1) to achieve high-speed machining of small-diameter tools: Step 4.1, install the spindle speed increasing device to the spindle taper hole of the boring and milling machine; Step 4.2, install the tool on the tool chuck (5); Step 4.3, operate the controller of the high-speed electric spindle (1) to drive the tool to rotate, accelerate, decelerate and stop; Step 4.4: Operate the coordinate axis of the machine tool to achieve rapid movement, feed, and retract to complete the corresponding processing.

2. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 1, characterized in that: The power of the high-speed electric spindle (1) is at least 5.5Kw, and the maximum spindle speed of the high-speed electric spindle (1) is 24000r / min.

3. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 1, characterized in that: The spindle fixing seat (2) comprises a first semi-arc sleeve (201) and a second semi-arc sleeve (202) which are symmetrically combined and connected, the mating surfaces of the first semi-arc sleeve (201) and the second semi-arc sleeve (202) are processed with a split surface (203), the mating surfaces of the first semi-arc sleeve (201) and the second semi-arc sleeve (202) are processed with bolt mating holes (207) for installing connecting bolts (6), and the ends of the first semi-arc sleeve (201) and the second semi-arc sleeve (202) are provided with flange plates (206), and the flange plates (206) are uniformly processed with flange holes (208) in a circumferential manner.

4. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 3, characterized in that: A wire hole (204) is machined on the first semi-arc sleeve (201) and the second semi-arc sleeve (202) at an end close to the flange plate (206).

5. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 4, characterized in that: The wire hole (204) is used to pass a power line connected to the high-speed electric spindle (1) and a cooling water pipe for cooling the tool.

6. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 3, characterized in that: The flange plate (206) is fixedly connected to the milling cutter handle (3) via flange bolts (4).

7. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 3, characterized in that: The bolt matching hole (207) includes a tangential bolt hole (210) machined on the first semi-arc sleeve (201) and a tangential through hole (209) machined on the second semi-arc sleeve (202), or a tangential through hole (209) machined on the first semi-arc sleeve (201) and a tangential bolt hole (210) machined on the second semi-arc sleeve (202). The tangential bolt hole (210) and the tangential through hole (209) are matched with the connecting bolt (6) to realize the combined connection of the first semi-arc sleeve (201) and the second semi-arc sleeve (202).

8. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 3, characterized in that: The outer end surface of the flange plate (206) is machined with a keyway (205) along the direction of the split surface (203), and the keyway (205) is matched with the keyway of the matching end surface of the milling cutter handle (3) via a flat key.

9. The method for using the speed increasing device for a conventional heavy-duty low-speed boring and milling machine according to claim 3, characterized in that: The tool chuck (5) adopts an ER chuck and is used to clamp a tool with a diameter of Φ1mm to Φ20mm.

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