Milling cutter grinding machine of elastic pre-tightening mechanism

Abstract

The invention discloses a milling cutter grinding machine of an elastic pre-tightening mechanism. The milling cutter grinding machine comprises a grinding machine body, and a plurality of cutter grinding stations are arranged on the grinding machine body; the chuck mechanism is arranged in the knife sharpening station; the milling cutter clamping seat is used for clamping a milling cutter to be ground; and the elastic pre-tightening mechanism is connected with the chuck mechanism and the milling cutter clamping seat so as to apply a stable acting force towards the grinding wheel to the milling cutter clamping seat when the milling cutter is ground. By means of the scheme, stable control over the grinding pressure in the cutter grinding process is achieved, under the condition that an existing milling cutter grinding machine is still adopted, the consistency of all cutting edges is greatly improved after the milling cutter is ground, and on the basis that the existing milling cutter grinding machine is adopted, the grinding efficiency is greatly improved. And the ground cutter has the capability of being applied to a high-precision machining scene.

Description

Technical Field

[0001] This invention relates to milling cutter grinding machines, and more particularly to a milling cutter grinding machine with an elastic preload mechanism. Background Technology

[0002] When end mills wear down, they are usually reground to reduce operating costs and restore their performance to meet machining requirements. Traditional end mill grinding is typically done manually, a method requiring highly experienced workers and resulting in a very low yield rate. End mill grinding machines have emerged to address this, significantly lowering the technical barrier to end mill grinding. However, it's important to note that the consistency of cutting edges produced by end mill grinding machines remains challenging, making them unsuitable for high-precision machining applications. Further analysis reveals that the difficulty in achieving consistent parameters across cutting edges in end mill grinding machines stems primarily from the following reasons:

[0003] 1. Uneven Pressure: When grinding end mills, workers rely on experience to apply axial pressure to the cutter holder to ensure full contact between the cutter head and the grinding wheel. However, this pressure application method needs to be done manually, and some axial runout is inevitable during the grinding process. This runout causes hand tremors, and under tremors, it is difficult for the worker to maintain a constant pressure. This results in fluctuations in the force on the cutting edge during grinding, and this fluctuation, or instability in the force during grinding, can lead to problems such as blade tilting and asymmetrical obtuse angles.

[0004] 2. Poor repeatability: A milling cutter typically has 2 to 4 cutting edges, meaning that the cutting edge needs to be sharpened 2 to 4 times during the sharpening process. However, in actual operation, it has been found that not only do different operators apply different amounts of force, but even the same operator applies different forces to each cutting edge during sharpening. This makes it difficult to ensure the consistency of geometric parameters when sharpening the same tool multiple times, and the cutting edge runout error is usually >0.05mm.

[0005] It is important to know that in high-precision machining scenarios, the consistency requirements for the parameters of each cutting edge of the tool are usually very high. Existing manual tool sharpening has the above problems, which greatly limits the application of milling cutter sharpening machines in high-precision machining scenarios.

[0006] 3. Uneven wear of the grinding wheel: Due to inconsistent force applied by the worker, the pressure on different areas of the grinding wheel during the grinding of the cutting edge is not uniform, resulting in inconsistent wear across different areas of the grinding wheel. During subsequent grinding of the end mill, this uneven wear will exacerbate the axial runout and uneven stress on the end mill.

[0007] Therefore, it is obviously very necessary to design a device with a reliable structure that can achieve stable output of grinding pressure when grinding milling cutters. Summary of the Invention

[0008] The purpose of this invention is to provide a milling cutter grinding machine with an elastic preload mechanism to improve the problem of unstable pressure control when workers use the grinding machine to grind the cutting edge of milling cutters.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A milling cutter grinding machine with an elastic preload mechanism, comprising:

[0011] The grinding machine body has multiple sharpening stations;

[0012] The chuck mechanism is located in the tool grinding station;

[0013] Milling cutter holder, used to hold the milling cutter to be sharpened;

[0014] An elastic preload mechanism is connected to the chuck mechanism and the milling cutter holder to apply a stabilizing force toward the grinding wheel to the milling cutter holder during milling.

[0015] Preferably, the elastic preload mechanism includes a rotating sleeve, which is coaxially connected to the milling cutter holder and can rotate relative to the milling cutter holder. At least two sets of pressure stabilizing components are evenly distributed circumferentially in the rotating sleeve. Each pressure stabilizing component has a telescopic rod, which extends out of the rotating sleeve and is inserted into the chuck mechanism.

[0016] Preferably, the pressure stabilizing assembly includes a housing fixedly connected to a rotating sleeve. A telescopic rod is disposed within the housing. The telescopic rod is inverted T-shape, with its upper end extending upwards out of the housing and downwards out of the rotating sleeve. A spring A is sleeved on the telescopic rod, in a compressed state. One end of spring A is supported below the T-shaped head of the telescopic rod, and the other end is supported at the bottom of the housing to apply a downward thrust to the telescopic rod. A groove extending axially along the telescopic rod is provided on the housing, and a limiting pin is disposed on the telescopic rod slidingly within the groove. Pressure plates are symmetrically disposed on both sides of the telescopic rod. The two pressure plates protrude in an arc shape towards the surface of the telescopic rod, forming a gourd-shaped opening. The upper end of the pressure plates is hinged to the housing. A spring B is disposed on the side of the pressure plate facing away from the telescopic rod, in a compressed state, so that the pressure plate smoothly presses against both sides of the T-shaped head of the telescopic rod. Pushing the telescopic rod upwards causes the upwardly moving T-shaped head to push the pressure plates outwards.

[0017] Preferably, the height difference between the lower edge of the pressure plate and the narrowest point of the two pressure plates is 5mm.

[0018] Preferably, the rotating sleeve includes a slip ring and a sleeve, the slip ring being fixedly sleeved on the milling cutter holder, and the sleeve being rotatably sleeved on the slip ring.

[0019] Preferably, the milling cutter holder includes a front collet, a rear collet, and a hole clamp. A retaining plate is detachably provided at the bottom of the sleeve. The bottom of the retaining plate has an axially extending pin, which passes through the rear collet and extends into the bottom of the sleeve.

[0020] Preferably, a magnet is provided at the bottom of the card plate, and after the card plate is placed in the sleeve, the magnet is attracted to the bottom of the sleeve.

[0021] Preferably, the upper surface of the card plate is provided with a disassembly plate extending axially to the outside of the sleeve. The disassembly plate has two pieces arranged symmetrically, and the upper end of the disassembly plate is extended outward.

[0022] Preferably, the chuck mechanism includes a tool holder mounted on the grinding station. The tool holder protrudes from the surface of the grinding machine body and has an insertion hole. The outer edge of the tool holder also has a circumferential groove A. A retaining ring is rotatably disposed in the groove A. The inner ring of the retaining ring has an opening-shaped clearance area. The lower end of the telescopic rod is slidably inserted into the insertion hole. The lower end surface of the telescopic rod also has a groove B. Rotating the retaining ring causes the inner edge of the retaining ring to enter the groove B.

[0023] Preferably, the tool holder is further provided with a spring plunger, and the retaining ring is provided with a positioning hole. The retaining ring is rotated to a set position so that the spring plunger enters the positioning hole.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This solution uses an elastic preload mechanism that applies a stable force to the milling cutter holder to stabilize the force acting on the grinding wheel during milling. This avoids the problems of inconsistent tool parameters and poor wear uniformity in different areas of the grinding wheel caused by fluctuating forces. Ultimately, it will significantly improve the consistency of parameters of each cutting edge of the milled tool, providing a foundation for the application of existing grinding machines in high-precision machining scenarios. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 This is an exploded view of the elastic preload mechanism and the milling cutter holder;

[0029] Figure 4 for Figure 3 A sectional view;

[0030] Figure 5 This is a schematic diagram of the pressure stabilization component.

[0031] Figure 6 This is a schematic diagram of the card plate structure.

[0032] Reference numerals: 1. Grinding machine body; 2. Chuck mechanism; 21. Tool holder; 211. Insertion hole; 212. Annular groove A; 22. Snap ring; 221. Clearance area; 222. Positioning hole; 23. Spring plunger; 3. Milling cutter holder; 31. Front chuck; 32. Rear chuck; 33. Hole clamp; 4. Elastic preload mechanism; 41. Rotating sleeve; 411. Slip ring; 412. Sleeve; 42. Pressure stabilizing component; 421. Housing; 4211. Slide groove; 422. Telescopic rod; 4221. Annular groove B; 423. Spring A; 424. Pressure plate; 425. Spring B; 426. Limit pin; 43. Clamping plate; 431. Pin; 432. Magnet; 433. Removal plate. Detailed Implementation

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] like Figures 1-6 The milling cutter grinding machine with an elastic preload mechanism shown includes a grinding machine body 1. This grinding machine uses a traditional milling cutter grinding machine and has end face grinding, rake angle grinding, and clearance angle grinding functions. This is reflected in the grinding stations, which include end face grinding, rake angle grinding, and clearance angle grinding stations. A chuck mechanism 2 is installed in each of these grinding stations for detachable connection with the elastic preload mechanism 4. It should be noted that this technical solution also includes a milling cutter holder 3 capable of holding milling cutters of different diameters. Figure 2 , Figure 4 As shown, in this scheme, the milling cutter clamp is connected to the elastic preload mechanism 4 after clamping the tool. Then, the elastic preload mechanism 4 is connected to the chuck mechanism 2. The elastic preload mechanism 4, which can provide stable output pressure, replaces the axial pressure applied manually when grinding the tool, so that the tool can be ground under a constant pressure condition.

[0037] Specifically, in this solution, the elastic preload mechanism 4 includes a rotating sleeve 41, which serves to achieve a detachable connection between the elastic preload mechanism 4 and the milling cutter holder 3. At least two sets of pressure stabilizing components 42 are provided on the elastic sleeve. Each pressure stabilizing component 42 has a telescopic rod 422 extending from the rotating sleeve 41. This telescopic rod 422 connects to the chuck mechanism 2 below, so that the pressure stabilizing component 42, the milling cutter holder 3, and the chuck mechanism 2 form a whole. The stabilizing force applied by the pressure stabilizing component 42 can be effectively fed back to the milling cutter holder 3, ensuring that the milling cutter held by the milling cutter holder 3 receives a stable force regardless of whether axial runout occurs.

[0038] It is important to know that there are various mechanisms capable of maintaining axial force stability during axial runout. In this solution, the pressure stabilizing component 42 includes a housing 421 fixedly connected to the rotating sleeve 41. A telescopic rod 422 is disposed within the housing 421. The telescopic rod 422 is generally inverted T-shaped. The upper end of the telescopic rod 422 extends vertically out of the housing 421, then extends vertically downwards in a U-shaped turn, passing through the bottom of the rotating sleeve 41 and detachably inserting into the chuck mechanism 2. Simultaneously, a spring A423 is fitted onto the telescopic rod 422. The spring A423 is compressed, with one end supported below the T-shaped head of the telescopic rod 422 and the other end abutting against the housing 421, applying an initial force to the telescopic rod 422. Under the force of the spring A423, the telescopic rod 422 tends to move downwards. It is important to know that milling cutter edge grinding typically wears down the cutter tip by about 2-3 mm. Therefore, this design incorporates a groove 4211 on the housing 421, with a stroke of 5 mm. A limiting pin 426 is slidably mounted within this groove 4211. This limiting pin 426 connects to the T-shaped head of the telescopic rod 422, constraining the lifting stroke of the telescopic rod 422 while ensuring that the telescopic rod 422 maintains a downward initial thrust when the limiting pin 426 is at the lowest point of the groove 4211. Additionally, as... Figure 5 As shown, two pressure plates 424 are symmetrically arranged on both sides of the telescopic rod 422. The side of these pressure plates 424 facing the telescopic rod 422 has an arc-shaped curved surface and protrudes in the direction of the telescopic rod 422, forming a gourd-shaped channel that is wider at the top and bottom and narrower in the middle. Furthermore, it should be noted that the upper end of the pressure plate 424 is hinged to the bottom of the housing 421, allowing the pressure plate 424 to flip towards or away from the telescopic rod 422. Figure 5As shown, two springs B425 are also installed in the housing 421. These two springs B425 are connected in a compressed state to the side of the pressure plate 424 facing away from the telescopic rod 422 and to the housing 421, so that the arc-shaped surface of the pressure plate 424 smoothly abuts against both sides of the T-shaped head of the telescopic rod 422. When the telescopic rod 422 is compressed and moves upward, the T-shaped head of the telescopic rod 422 compresses the spring A423. At this time, the force exerted by the spring A423 on the telescopic rod 422 will increase. Simultaneously, while compressing the spring A423, the telescopic rod 422 will push the pressure plate 424 to flip. The flipped pressure plate 424 will then drive the spring B425 to be further compressed. When the spring B425 is compressed, the force exerted by it on both sides of the T-shaped head of the telescopic rod 422 through the curved surface of the pressure plate 424 can be divided into a vertically downward component and a horizontal component. The two vertically downward components increase with the further compression of the spring B425, and the increase is the same as the increase after the spring A423 is compressed. The horizontal component cancels each other out, thus ensuring that the output force remains stable no matter how the telescopic rod 422 moves up and down. It is important to know that because the end mill cutter head has a pre-set wear length (2~3mm) during tool setting, after the elastic preload mechanism 4 is fixed to the chuck mechanism 2, while the end mill cutter head abuts against the grinding wheel, the end mill cutter holder 3, which is fixedly connected to the housing 421, will adaptively retract. At this time, the housing 421 will move backward relative to the telescopic rod 422, and the spring A423 will be compressed. According to the working principle of the pressure stabilizing component 42, regardless of whether the telescopic rod 422 in the pressure stabilizing component 42 rises or falls, the force output by the pressure stabilizing component 42 will be constant. That is, during the grinding process, the end mill will be subjected to a constant axial force applied by the pressure stabilizing component 42.

[0039] It should be noted that in this solution, the end mill blade is re-ground, and the thickness of the re-ground end face is usually 2~3mm. In order to ensure that the pressure stabilization component 42 has sufficient constant pressure, the height difference from the lower edge of the pressure plate 424 to the narrowest point of the two pressure plates 424 should be 5mm. For this purpose, the length of the slide groove 4211 can be set to 5mm, that is, the sliding stroke of the limit pin 426 in this solution is 5mm.

[0040] Furthermore, it is important to understand that in this design, the rotating sleeve 41 needs to be able to accommodate the rotational requirements during the grinding of the rake and clearance angles of the cutting tool. Therefore, the rotating sleeve 41 includes a slip ring 411 and a sleeve 412. The slip ring 411 is coaxially fitted onto the milling cutter holder 3 and held by the front collet 31 and rear collet 32 ​​assembled together within the milling cutter holder 3. The sleeve 412 is rotatably fitted onto the slip ring 411, facilitating the rotation of the milling cutter holder 3 relative to the grinding machine body 1 at a certain angle during the grinding of the rake and clearance angles of the cutting tool.

[0041] It should be noted that in this design, because the rear collet 32 ​​of the milling cutter holder 3 is located in the rotating sleeve 41, a preload mechanism 4 in this design also includes a retaining plate 43. This retaining plate 43 is placed in the rotating sleeve 41, and the bottom surface of the retaining plate 43 has an axially extending pin 431. This pin 43 can pass through the pin hole on the rear collet 32 ​​and enter the corresponding pin hole on the bottom of the sleeve 412. At this time, the retaining plate 43 fixes the rear collet 32 ​​and the sleeve 412 into a single unit, so only the rotation of the outer sleeve 412 is needed to rotate the inner rear collet 32.

[0042] It should be noted that, in order to prevent the clamping plate 43 from falling out when tightening the rear clamp 32, several magnets 432 are embedded at the bottom of the clamping plate 43. When the clamping plate 43 is placed into the sleeve 412, the magnets 432 are attracted to the bottom of the sleeve 412, thus preventing the clamping plate 43 from falling out.

[0043] Furthermore, it should be noted that while the stability of the chuck 43 within the sleeve 412 is increased due to the magnet 432 on the chuck 43, removing the chuck 43 from the sleeve 412 becomes more difficult, making it harder to easily unload it. It should be pointed out that if the chuck 43 remains in place, rotating the milling cutter holder 3 would be impossible due to the connection between the pressure stabilizing component 42 and the chuck mechanism 2. Therefore, even after fixing the front chuck 31 and the rear chuck 32 together, the chuck 43 still needs to be removed. To facilitate removal of the chuck 43 with the magnet 432, two symmetrical disassembly plates 433 are also provided on the upper surface of the chuck 43 in this design. Specifically, the upper ends of these two disassembly plates 433 extend outside the sleeve 412, and the disassembly plates 433 are bent outwards to form an inverted "π" shape, facilitating gripping and force application by fingers.

[0044] It should be noted that in this design, the chuck mechanism 2 includes a tool holder 21 mounted on each grinding station, which protrudes from the surface of the grinding machine. Several insertion holes 211 are provided on the tool holder 21 for detachable connection between the pressure stabilizing component 42 and the chuck mechanism 2. Specifically, an annular groove A212 is formed on the outer edge of the tool holder 21, within which a retaining ring 22 is rotatably mounted. The inner ring of the retaining ring 22 is in smooth contact with the annular groove A212. Simultaneously, the inner ring of the retaining ring 22 also has the same number of clearance areas 221 as the pressure stabilizing component 42, which open in a gradually widening manner. Meanwhile, an annular groove B4221 is provided on the lower end surface of the telescopic rod 422. When the telescopic rod 422 is inserted into the insertion hole 211, the annular groove A212 on the tool holder 21 and the annular groove B4221 on the telescopic rod 422 are on the same level. Then, by simply rotating the retaining ring 22 and letting the inner edge of the retaining ring 22 enter the annular groove B4221, the elastic pre-tightening mechanism 4 and the chuck mechanism 2 can be quickly connected.

[0045] In addition, to facilitate determining whether the retaining ring 22 has rotated to the correct position, a spring plunger 23 is installed on the tool holder 21, and correspondingly, two positioning holes 222 are provided on the retaining ring 22. When the retaining ring 22 rotates a certain angle, the spring plunger 23 enters one of the positioning holes 222, at which point the retaining ring 22 will lock the telescopic rod 422 in the insertion hole 211. When it is necessary to remove the elastic preload mechanism 4 from the chuck mechanism 2, simply rotate the retaining ring 22 a certain angle so that the spring plunger 23 enters the other positioning hole 222. At this point, the clearance area 221 on the retaining ring 22 reaches the telescopic rod 422, and the retaining ring 22 exits the annular groove B4221 on the telescopic rod 422. The elastic preload mechanism 4 can then be easily removed from the chuck mechanism 2 to enter another station for tool grinding.

[0046] Working Principle: When tool sharpening is required, the operator first loosens the milling cutter holder 3, then places the rotating sleeve 41 of the elastic pre-tightening mechanism 4 onto the front collet 31, and then initially connects the rear collet 32 ​​to the front collet 31. At this time, the clamp 33 in the milling cutter holder 3 remains loose. After the above preparations are completed, the operator inserts the front collet 31 into the tool setting holder, and then inserts the milling cutter to be sharpened into the milling cutter holder 3 for tool setting. It should be noted that during the tool setting process, it is necessary to ensure that the tool head has a sharpening allowance of 2-3mm during the subsequent sharpening process. To achieve this, the position of the baffle in the tool setting holder can be adjusted so that when the telescopic rod 422 in the elastic pre-tightening mechanism 4 engages with the chuck mechanism 2, the milling cutter head abuts against the grinding wheel, and the milling cutter holder 3 is pushed back by the distance of the tool head sharpening allowance. After tool setting is completed, the operator inserts the chuck 43 into the rear collet 32, and passes the pin 431 of the chuck 43 through the bottom of the rear collet 32 ​​and the sleeve 412. Then, the sleeve 412 is rotated to tighten the rear collet 32 ​​and the front collet 31, at which point the hole clamp 33 also tightens to clamp the milling cutter. After tool setting is completed, the operator can insert the milling cutter holder 3 into the chuck mechanism 2 at the corresponding workstation according to the tool grinding steps to perform the corresponding grinding operation. It should be noted that when performing rake angle grinding and clearance angle grinding, the chuck 43 needs to be removed first to ensure that the rotating sleeve 41 has the ability to rotate relative to the chuck mechanism 2. It is important to know that during the grinding process, ensuring the stability of the connection between the elastic preload mechanism 4 and the chuck mechanism 2 is very important, as it affects the stability of the tool state during tool grinding. It should also be noted that when the tool is in each station and undergoing grinding, the telescopic rod 422 in the elastic preload mechanism 4 is initially pulled upwards. At this time, both springs A423 and B425 are further compressed. The increased elastic force from the compression of spring A423 is offset by the vertical component force generated by the compression of spring B425, thus ensuring the stability of the force output by the telescopic rod 422. It is important to understand that if axial runout occurs during the grinding process, the pressure stability is well maintained because the compression of springs A423 and B425 is adjusted synchronously. As described above, by maintaining the stability of the axial force on the tool during grinding, the grinding quality of the tool will be greatly improved.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A milling cutter grinding machine with an elastic preload mechanism, characterized in that: include The grinding machine body (1) has multiple grinding stations; The chuck mechanism (2) is located in the tool grinding station; Milling cutter holder (3) is used to hold the milling cutter to be ground; The elastic preload mechanism (4) is connected to the chuck mechanism (2) and the milling cutter holder (3) to apply a stabilizing force toward the grinding wheel to the milling cutter holder (3) when grinding the milling cutter.

2. The milling cutter grinding machine with an elastic preload mechanism as described in claim 1, characterized in that: The elastic preload mechanism (4) includes a rotating sleeve (41), which is coaxially connected to the milling cutter holder (3) and can rotate relative to the milling cutter holder (3). At least two sets of pressure stabilizing components (42) are evenly distributed in the circumference of the rotating sleeve (41). The pressure stabilizing components (42) have telescopic rods (422), which are inserted into the chuck mechanism (2) after passing through the rotating sleeve (41).

3. The milling cutter grinding machine with an elastic preload mechanism as described in claim 2, characterized in that: The pressure stabilizing assembly (42) includes a housing (421) fixedly connected to a rotating sleeve (41). A telescopic rod (422) is provided in the housing (421). The telescopic rod (422) is in the shape of an inverted T, with its upper end extending upward out of the housing (421) and downward out of the rotating sleeve. A spring A (423) is sleeved on the telescopic rod (422). The spring A (423) is in a compressed state, with one end supported below the T-shaped head of the telescopic rod (422) and the other end supported at the bottom of the housing (421) to apply a downward thrust to the telescopic rod. A groove (4) extending axially along the telescopic rod (422) is provided on the housing (421). 211), the telescopic rod (422) is provided with a limiting pin (426) that slides in the sliding groove (4211); pressure plates (424) are symmetrically arranged on both sides of the telescopic rod (422), the surfaces of the two pressure plates (424) facing the telescopic rod (422) are arc-shaped and gourd-shaped, the upper end of the pressure plate (424) is hinged to the housing (421), and a spring B (425) is provided on the side of the pressure plate (424) facing away from the telescopic rod (422), the spring B (425) is compressed so that the pressure plate (424) smoothly presses against both sides of the T-head of the telescopic rod (422), and pushes the telescopic rod (422) upward so that the upwardly moving T-head pushes the pressure plate (424) outward.

4. The milling cutter grinding machine with an elastic preload mechanism as described in claim 3, characterized in that: The height difference between the upper edge of the pressure plate (424) and the narrowest point of the two pressure plates (424) is 5mm.

5. A milling cutter grinding machine with an elastic preload mechanism as described in claim 2, characterized in that: The rotating sleeve (41) includes a slip ring (411) and a sleeve (412). The slip ring (411) is fixedly sleeved on the milling cutter holder (3), and the sleeve (412) is rotatably sleeved on the slip ring (411).

6. The milling cutter grinding machine with an elastic preload mechanism as described in claim 5, characterized in that: The milling cutter holder (3) includes a front chuck (31), a rear chuck (32), and a hole clamp (33). The bottom of the sleeve (412) is detachably provided with a retaining plate (43). The bottom of the retaining plate (43) has an axially extending pin (431). The pin (431) passes through the rear chuck (32) and extends into the bottom of the sleeve (412).

7. The milling cutter grinding machine with an elastic preload mechanism as described in claim 6, characterized in that: The bottom of the card plate (43) is provided with a magnet (432). After the card plate (43) is placed in the sleeve (412), the magnet (432) is attracted to the bottom of the sleeve (412).

8. The milling cutter grinding machine with an elastic preload mechanism as described in claim 7, characterized in that: The upper surface of the card plate (43) is provided with a disassembly plate (433) extending axially to the outside of the sleeve (412). There are two disassembly plates (433) arranged symmetrically, and the upper end of the disassembly plate (433) is extended outward.

9. A milling cutter grinding machine with an elastic preload mechanism as described in claim 2, characterized in that: The chuck mechanism (2) includes a tool holder (21) installed on the grinding station. The tool holder (21) protrudes from the surface of the grinding machine body (1). The tool holder (21) has an insertion hole (211). The outer edge of the tool holder (21) also has a circumferential groove A (212). A retaining ring (22) is rotatably disposed in the groove A (212). The inner ring of the retaining ring (22) has a gradually expanding clearance area (221). The lower end of the telescopic rod (422) is slidably inserted into the insertion hole (211). The lower end surface of the telescopic rod (422) also has a groove B (4221). Rotating the retaining ring (22) allows the inner edge of the retaining ring (22) to enter the groove B (4221).

10. A milling cutter grinding machine with an elastic preload mechanism as described in claim 9, characterized in that: The tool holder (21) is also provided with a spring plunger (23), and the retaining ring (22) is provided with a positioning hole (222). Rotate the retaining ring (22) to the set position so that the spring plunger (23) enters the positioning hole (222).

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