Milling cutter with overload protection function

Abstract

The milling cutter with the overload protection function comprises a cutter handle, a cutter bar is detachably installed in one end of the cutter handle, a milling cutter head is integrally formed at the end, away from the cutter handle, of the cutter bar, and an annular groove is formed in the surface of the cutter bar. The utility model has the beneficial effects that along with the increase of overload force, the circumferential transmission of the rod and the cutter handle is completely cut off, the excessive circumferential overload force can be effectively prevented from further damaging the connecting structure and internal transmission parts of the cutter rod, the milling cutter head and the cutter handle, the key part of the cutter is accurately protected, and the service life of the cutter is prolonged. Permanent deformation, cracks and even breakage caused by overload are avoided, the overall service life of the milling cutter is greatly prolonged, the cutter replacement frequency is reduced, the cutter purchase cost is reduced, and therefore the rejection rate caused by overload is reduced, and the machining quality and the production efficiency are improved.

Description

Technical Field

[0001] This utility model relates to a milling cutter, specifically a milling cutter with overload protection function, belonging to the field of milling cutter technology. Background Technology

[0002] Milling cutters are commonly used cutting tools in machining, used to mill various workpieces. During the milling process, due to factors such as the inhomogeneity of the workpiece material, improper cutting parameter settings, or tool wear, the milling cutter may be subjected to excessive cutting forces, i.e., overload.

[0003] In the prior art, such as the end mill with overload protection function disclosed in announcement number CN202320089113.8, when the cutting amount of the end mill is too large, the pressure on the tool holder increases. At this time, the tool holder will apply greater pressure to the support rod, and the pressure of the spring between the support rod and the groove will also increase. In this way, the support rod will move upward, thereby automatically changing the cutting amount. The above-mentioned prior art has the following shortcomings: During the use of the above-mentioned end mill with overload protection function, although the support rod will move upward axially to change the cutting amount when the cutting amount of the end mill is too large and the pressure on the tool holder increases, as the pressure increases, the circumferential force on the support rod will also increase. Excessive circumferential force will cause the end mill cutting edge to wear rapidly. When the cutting edge is subjected to circumferential force exceeding its design capacity, it may also cause damage or even breakage of the end mill. Once the end mill breaks, it will not only scrap the end mill itself, but the broken fragments of the end mill may also embed into the expensive workpiece material, causing the workpiece to be scrapped. At the same time, it may also pose a threat to the safety of the machining tool, the workpiece, and the operator. Utility Model Content

[0004] The purpose of this utility model is to provide a milling cutter with overload protection function in order to solve at least one of the above-mentioned technical problems.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a milling cutter with overload protection function, including a tool holder;

[0006] A tool holder is detachably installed at one end of the tool holder. A milling cutter head is integrally formed at the end of the tool holder away from the tool holder. An annular groove is formed on the surface of the tool holder. Multiple retaining grooves are formed in a ring on the surface of the tool holder. The same end of the multiple retaining grooves extends to the surface of the annular groove and is connected to the annular groove.

[0007] As a further improvement of this utility model: a locking block is slidably connected in a blind groove opened on the surface of the tool holder, with one end of the locking block inserted into the groove.

[0008] As a further improvement of this utility model: a telescopic sleeve is installed on one side of the locking block, and the other end of the telescopic sleeve is installed in a blind groove opened on the surface of the tool holder. A spring is sleeved on the surface of the telescopic sleeve.

[0009] As a further embodiment of this utility model: a threaded hole on the surface of the tool holder is threaded with a clamping screw, one end of which abuts against one side of the locking block, and the clamping screw is wrapped inside the telescopic sleeve.

[0010] As a further improvement of this utility model: a sliding plate is slidably connected inside the knife handle, and a spring is abutted on one side of the sliding plate, with one end of the spring abutting inside the knife handle.

[0011] As a further embodiment of this utility model: a telescopic rod is fixed to one side of the sliding plate, one end of the telescopic rod is fixedly installed inside the knife handle, and a spring is wound around the outside of the telescopic rod.

[0012] The beneficial effects of this utility model are:

[0013] This utility model is equipped with a tool holder, tool shank, spring one, sliding plate, slot, ring groove, locking block, spring two, and clamping screw, which work together to address abnormal situations during milling, such as sudden changes in the hardness of the material or excessive cutting depth, which cause a significant increase in cutting force. At the same time, the overload force is transmitted to the sliding plate inside the tool holder through the tool shank. When the overload force exceeds the set threshold of spring one, the sliding plate will overcome the elastic force of spring one and begin to compress spring one and slide along the telescopic rod into the tool holder, causing the tool shank to slide into the tool holder. This can effectively alleviate the direct impact of the overload force on the connection between the tool shank and the tool holder, avoid damage to the connection structure caused by excessive overload force concentrated at the connection, and extend the overall service life of the tool.

[0014] When a significant increase in cutting force occurs, resulting in circumferential overload, the overload force causes the tool holder to tend to shift circumferentially relative to the tool shank. As the tool holder slides inward towards the tool shank, the chuck can slide from the chuck groove into the annular groove as the overload force increases. At this point, the tool holder will be stationary, and the rotation of the tool shank will not drive the rotation of the tool holder. The circumferential transmission between the tool holder and the tool shank is completely cut off. This effectively prevents excessive circumferential overload force from further damaging the tool holder, milling cutter head, and the connection structure and internal transmission components of the tool shank. It precisely protects the critical parts of the tool, avoiding permanent deformation, cracks, or even breakage caused by overload, greatly extending the overall service life of the milling cutter, reducing the frequency of tool replacement, lowering tool purchase costs, thereby reducing the scrap rate caused by overload, and improving machining quality and production efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial cross-sectional view of the internal structure of the tool holder in this utility model;

[0017] Figure 3 This is a schematic diagram of the slot and annular groove in this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the locking block, spring 2, and clamping screw in this utility model;

[0019] Figure 5 In this utility model Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0020] In the diagram: 1. Tool holder; 2. Tool shank; 3. Milling cutter head; 4. Telescopic rod; 5. Spring 1; 6. Sliding plate; 8. Slot; 9. Circular groove; 10. Locking block; 11. Telescopic sleeve; 12. Spring 2; 13. Clamping screw; 14. Blind groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0022] like Figures 1 to 5 As shown, a milling cutter with overload protection function includes a tool holder 1;

[0023] A tool holder 2 is detachably installed at one end of the tool holder 1. A milling cutter head 3 is integrally formed at the end of the tool holder 2 away from the tool holder 1. An annular groove 9 is formed on the surface of the tool holder 2. Multiple slots 8 are formed in a ring on the surface of the tool holder 2. The same end of the multiple slots 8 extends to the surface of the annular groove 9 and is connected to the annular groove 9.

[0024] A locking block 10 is slidably connected in a blind groove 14 on the surface of the tool holder 1, with one end of the locking block 10 inserted into the groove 8.

[0025] A telescopic sleeve 11 is installed on one side of the locking block 10, and the other end of the telescopic sleeve 11 is installed in a blind groove 14 opened on the surface of the tool holder 1. A spring 2 12 is sleeved on the surface of the telescopic sleeve 11.

[0026] When the cutting force increases significantly and a circumferential overload occurs, the overload force will cause the tool holder 2 to have a circumferential displacement tendency relative to the tool shank 1. As the tool holder 2 slides into the tool shank 1, with the increase of the overload force, the locking block 10 can slide from the locking groove 8 into the annular groove 9 until the locking block 10 is in the annular groove 9. At this time, the tool holder 2 will be in a stationary state, and the rotation of the tool shank 1 will not drive the rotation of the tool holder 2. The circumferential transmission between the tool holder 2 and the tool shank 1 is completely cut off. This can effectively prevent the excessive circumferential overload force from further damaging the connection structure and internal transmission components of the tool holder 2, the milling cutter head 3, and the tool shank 1. It precisely protects the key parts of the tool and avoids permanent deformation, cracks, or even breakage caused by overload, greatly extending the overall service life of the milling cutter. Example 2

[0027] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0028] The threaded hole on the surface of the tool holder 1 is threaded with a clamping screw 13. One end of the clamping screw 13 abuts against one side of the locking block 10, and the clamping screw 13 is wrapped inside the telescopic sleeve 11.

[0029] By rotating the clamping screw 13, the tightness of the locking block 10 in the slot 8 can be adjusted to ensure the stability of the tool holder 2 installation. Example 3

[0030] In addition to all the technical features included in Embodiment 1, this embodiment also includes:

[0031] A sliding plate 6 is slidably connected inside the handle 1. A spring 5 is abutted on one side of the sliding plate 6. One end of the spring 5 is abutted inside the handle 1. A telescopic rod 4 is fixed on one side of the sliding plate 6. One end of the telescopic rod 4 is fixedly installed inside the handle 1. The spring 5 is wrapped around the outside of the telescopic rod 4.

[0032] The overload force is also transmitted to the sliding plate 6 inside the tool holder 1 through the tool holder 2. When the overload force exceeds the set threshold of the spring 5, the sliding plate 6 will overcome the elastic force of the spring 5 and begin to compress the spring 5 and slide along the telescopic rod 4 into the tool holder 1, causing the tool holder 2 to slide into the tool holder 1. This can effectively alleviate the direct impact of the overload force on the connection between the tool holder 2 and the tool holder 1, avoid damage to the connection structure caused by excessive overload force concentrated at the connection, and extend the overall service life of the tool.

[0033] Working principle: First, insert the tool bar 2 into one end of the tool holder 1. At this time, under the action of the second spring 12, the locking block 10 in the blind groove 14 on the surface of the tool holder 1 will insert one end into the slot 8 on the surface of the tool bar 2, thereby realizing the initial connection between the tool bar 2 and the tool holder 1. By rotating the tightening screw 13, the degree of locking of the locking block 10 in the slot 8 can be adjusted to ensure the stability of the tool bar 2 installation. Inside the tool holder 1, the sliding plate 6 is in a certain initial position under the push of the first spring 5. The telescopic rod 4 plays a guiding role to ensure that the sliding plate 6 can only slide in a straight line.

[0034] When abnormal situations are encountered during milling, such as sudden changes in the hardness of the material or excessive cutting depth, the cutting force increases significantly. At the same time, the overload force is transmitted to the sliding plate 6 inside the tool holder 1 through the tool holder 2. When the overload force exceeds the set threshold of the spring 5, the sliding plate 6 will overcome the elastic force of the spring 5 and begin to compress the spring 5 and slide along the telescopic rod 4 into the tool holder 1, causing the tool holder 2 to slide into the tool holder 1. This can effectively alleviate the direct impact of the overload force on the connection between the tool holder 2 and the tool holder 1, avoid damage to the connection structure caused by excessive overload force concentrated at the connection, and extend the overall service life of the tool.

[0035] When the cutting force increases significantly and a circumferential overload occurs, the overload force will cause the tool holder 2 to tend to shift circumferentially relative to the tool shank 1. As the tool holder 2 slides into the tool shank 1, with the increase of the overload force, the locking block 10 can slide from the locking groove 8 into the annular groove 9 until the locking block 10 is in the annular groove 9. At this point, the tool holder 2 will be stationary, and the rotation of the tool shank 1 will not drive the rotation of the tool holder 2. The circumferential transmission between the tool holder 2 and the tool shank 1 is completely cut off. This can effectively prevent the excessive circumferential overload force from further damaging the connection structure and internal transmission components of the tool holder 2, the milling cutter head 3, and the tool shank 1. It precisely protects the key parts of the tool, avoids permanent deformation, cracks, or even breakage caused by overload, greatly extends the overall service life of the milling cutter, reduces the tool replacement frequency, reduces tool purchase costs, thereby reducing the scrap rate caused by overload and improving machining quality and production efficiency.

[0036] It should be noted that both the telescopic rod 4 and the telescopic sleeve 11 are composed of two square rods with different diameters. The rod with the smaller diameter is slidably connected inside the rod with the larger diameter. In this technology, it is only used for guiding and supporting purposes.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A milling cutter with overload protection function, including a tool holder (1); Its features are: A tool holder (2) is detachably installed at one end of the tool holder (1). A milling cutter head (3) is integrally formed at the end of the tool holder (2) away from the tool holder (1). An annular groove (9) is provided on the surface of the tool holder (2). Multiple slots (8) are provided on the surface of the tool holder (2) in an annular pattern. The same end of the multiple slots (8) extends to the surface of the annular groove (9) and is connected to the annular groove (9).

2. The milling cutter with overload protection function according to claim 1, characterized in that: A locking block (10) is slidably connected in a blind groove (14) on the surface of the handle (1), and one end of the locking block (10) is inserted into the groove (8).

3. The milling cutter with overload protection function according to claim 2, characterized in that: A telescopic sleeve (11) is installed on one side of the card block (10), and the other end of the telescopic sleeve (11) is installed in a blind groove (14) opened on the surface of the knife handle (1). A spring (12) is sleeved on the surface of the telescopic sleeve (11).

4. The milling cutter with overload protection function according to claim 3, characterized in that: The threaded hole on the surface of the tool holder (1) is threaded with a clamping screw (13). One end of the clamping screw (13) abuts against one side of the locking block (10), and the clamping screw (13) is wrapped inside the telescopic sleeve (11).

5. The milling cutter with overload protection function according to claim 1, characterized in that: The handle (1) is slidably connected to a sliding plate (6), and a spring (5) is abutted on one side of the sliding plate (6). One end of the spring (5) abuts against the inside of the handle (1).

6. The milling cutter with overload protection function according to claim 5, characterized in that: A telescopic rod (4) is fixed on one side of the sliding plate (6), and one end of the telescopic rod (4) is fixedly installed inside the handle (1). The spring (5) is wrapped around the outside of the telescopic rod (4).

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