Efficient cooling tool for machine tool machining and spindle assembly

Abstract

The utility model discloses an efficient cooling cutter and main shaft assembly for machine tool processing, which comprises a main shaft, a cutter and a cooling cylinder, the lower end of a cutter holder at the middle lower part of the cutter is arranged in a main shaft inner hole of the main shaft, the cylindrical and axially through cooling cylinder is sleeved outside the main shaft, and an annular inner cavity is arranged between the inner wall of the cooling cylinder and the outer wall of the main shaft; a cooling liquid inlet penetrating through the interior and the exterior is formed in the position, corresponding to the annular inner cavity, of the cylinder wall of the cooling cylinder, a radial through hole communicated with an inner hole of the main shaft is formed in the position, corresponding to the annular inner cavity, of the main shaft, and a cooling liquid through hole is formed in the center of the cutter. The upper end of the cooling liquid through hole is located at the center of the tool bit and is open, and the lower end is located at the lower end of the tool apron and is open. According to the cooling device, cooling liquid can be in direct contact with the center position of the tool bit really, in the machining process of drilling and the like, the portion with the maximum heating value is cooled more efficiently, the cooling effect is remarkably improved, the cooling liquid is saved, and meanwhile time and labor are saved when the cooling device is applied, and use is convenient.

Description

Technical Field

[0001] The utility model relates to a partial structure of a machine tool, in particular to a tool and spindle assembly for machine tool processing with efficient cooling. Background Art

[0002] The tool of the machine tool is installed on the spindle, and the spindle is driven by a driving motor to rotate, thereby driving the tool to rotate to realize functions such as drilling and grinding. Since a large amount of heat is generated when the tool rotates at a high speed and contacts the part, it is generally necessary to cool while processing. In most cases, the coolant is used to cool the tool tip. The traditional cooling method is generally to install a coolant pipe beside the tool, and the coolant pump pumps the coolant into the coolant pipe and sprays it against the tool tip to achieve the purpose of cooling while processing.

[0003] The above traditional cooling method has the following defects: First, no matter how accurately the coolant pipe is aligned, it is very difficult for the coolant to really directly contact the center position of the tool tip. During processing such as drilling, the center position of the tool tip directly contacts the workpiece and rotates at a high speed, which is the part with the largest heat generation. Therefore, the cooling effect for drilling processing can never reach the best, and it will waste a lot of coolant resources. At the same time, it is not conducive to efficient chip removal. Second, when the processing position of the tool changes due to different workpieces, it is necessary to adjust the position of the coolant pipe, which not only increases the difficulty of aligning the tool tip, but also is time-consuming and laborious to operate and inconvenient to use. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a tool and spindle assembly for machine tool processing with efficient cooling that cools from the center position of the tool tip and is convenient for cooling operation to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] A tool and spindle assembly for machine tool processing with efficient cooling, including a spindle and a tool. One end of the spindle is connected to the tool, and this end of the spindle is regarded as the upper end. The spindle is provided with a spindle inner hole with an upper opening and a lower closing. The upper part of the tool is a tool tip, and the middle and lower parts are a tool holder. The lower end of the tool holder is placed in the spindle inner hole. The tool and spindle assembly for machine tool processing with efficient cooling further includes a cooling cylinder. The cooling cylinder, which is cylindrical and axially through, is sleeved outside the spindle. A circular inner cavity is provided between the inner wall of the cooling cylinder and the outer wall of the spindle. A coolant inlet that is through inside and outside is provided at a position on the cylinder wall of the cooling cylinder corresponding to the circular inner cavity. A radial through hole communicating with the spindle inner hole is provided at a position on the spindle corresponding to the circular inner cavity. A coolant through hole is provided at the center position of the tool. The upper end of the coolant through hole is located at the center position of the tool tip and is open, and the lower end is located at the lower end of the tool holder and is open.

[0007] Preferably, in order to facilitate the formation of an annular inner cavity and enable the cooling cylinder to be non-rotatable relative to the main shaft for easy connection with an external coolant pipe, two first bearings arranged vertically are installed between the inner wall of the cooling cylinder and the outer wall of the main shaft, and the annular inner cavity is formed between the two first bearings.

[0008] Preferably, in order to prevent coolant or external liquid from entering the first bearings, first sealing rings are respectively provided at the upper and lower ends of each first bearing, and the annular inner cavity is formed between two adjacent first sealing rings. Here, the first sealing rings adopt rotary sealing rings, that is, dynamic sealing rings.

[0009] Preferably, in order to better block external liquid or dust from entering the first bearings, an annular cover and an annular retaining ring are respectively provided between the position above the uppermost first sealing ring on the inner wall of the cooling cylinder and the outer wall of the main shaft, and between the position below the lowermost first sealing ring on the inner wall of the cooling cylinder and the outer wall of the main shaft. The outer peripheral edge of the annular retaining ring is placed in a corresponding annular groove on the inner wall of the cooling cylinder and presses the corresponding annular cover against the corresponding first sealing ring.

[0010] Preferably, in order to facilitate the installation of the main shaft on the machine tool and enable it to rotate freely, a second bearing is sleeved on the main shaft at a position below the cooling cylinder.

[0011] Preferably, in order to facilitate the installation of the second bearing, the lower part of the cooling cylinder is provided with a conical section that is smaller at the top and larger at the bottom. An annular bearing end cover is provided between the conical section and the upper end of the second bearing. The edge of the bearing end cover is connected to the outer ring of the second bearing. A section of the main shaft corresponding to the second bearing has an increased outer diameter to form a large-diameter section, and the inner ring of the second bearing is connected to the outer wall of the large-diameter section.

[0012] Preferably, in order to more reliably install the second bearing and better connect the conical section of the cooling cylinder with the bearing end cover, a retaining ring protruding outward in the circumferential direction is provided at a position above the second bearing in the large-diameter section of the main shaft. The upper end of the inner ring of the second bearing is in close contact with the lower surface of the retaining ring. A second sealing ring is provided between the position where the bearing end cover protrudes upward near its circumferential inner wall and is located inside the conical section and the outer wall of the main shaft. A concave ring is provided at the lower end of the conical section, and a convex ring is provided at the position corresponding to the concave ring on the upper surface of the bearing end cover. The convex ring is placed inside the concave ring.

[0013] Preferably, in order to facilitate driving the main shaft to rotate by means of gear meshing, a driven gear is sleeved on the main shaft near the lower end.

[0014] Preferably, in order to facilitate better positioning of the main shaft without affecting its free rotation, a third bearing is sleeved on the main shaft at a position below the driven gear. A first external thread is provided on the main shaft above the third bearing, and a second external thread is provided on the main shaft below the third bearing, and a nut is sleeved thereon.

[0015] Preferably, in order to achieve a better cooling effect, the tool holder and the tool head are integrally formed. A coolant drainage hole communicating with the coolant through hole and used for draining the coolant to both sides of the tool head is provided in the tool holder. Here, the coolant drainage hole can also be provided at positions close to both sides in the tool holder and communicated with the annular inner cavity through a connection through hole provided at a corresponding position in the main shaft.

[0016] The beneficial effects of the present utility model are as follows:

[0017] In the present utility model, a cooling cylinder is sleeved on the main shaft, an annular inner cavity is provided between the cooling cylinder and the main shaft, a coolant inlet is provided on the cylinder wall of the cooling cylinder, a radial through hole is provided on the main shaft, and a coolant through hole is provided at the central position of the tool. During use, the coolant can be injected into the inner hole of the main shaft from the coolant inlet, and then sprayed out from the central position of the tool head through the coolant through hole, so that the coolant can truly directly contact the central position of the tool head. During machining processes such as drilling, more efficient cooling is performed on the part with the largest heat generation, significantly improving the cooling effect and saving coolant, and facilitating efficient chip removal. At the same time, since the cooling cylinder is integrally connected to the main shaft, during application, when the machining position of the tool changes due to different workpieces, the best cooling effect can be achieved without any other operations, which is time-saving and labor-saving and convenient to use. Description of the Drawings

[0018] Figure 1 is a perspective view of the tool and main shaft assembly for machine tool machining with high-efficiency cooling of the present utility model;

[0019] Figure 2 is a front view sectional view of the tool and main shaft assembly for machine tool machining with high-efficiency cooling of the present utility model;

[0020] Figure 3 is a perspective view of the main shaft of the tool and main shaft assembly for machine tool machining with high-efficiency cooling of the present utility model;

[0021] Figure 4 is a perspective view of the tool and main shaft assembly for machine tool machining with high-efficiency cooling of the present utility model when driven by a machine tool motor. Detailed Embodiments

[0022] The present utility model will be further described below with reference to the drawings:

[0023] AsFigures 1 - 3 As shown in the figure, the tool and spindle assembly for machine tool processing with high-efficiency cooling of the present utility model includes a spindle 3, a tool, and a cooling cylinder 5. One end of the spindle 3 is connected to the tool, and taking this end of the spindle 3 as the upper end, the spindle 3 is provided with a spindle inner hole 23 with an upper opening and a lower closing. The upper part of the tool is a tool tip 1, and the middle and lower part is a tool holder 2. The lower end of the tool holder 2 is placed in the spindle inner hole 23. A cylindrically shaped cooling cylinder 5 with an axial through hole is sleeved outside the spindle 3. A circular inner cavity 20 is provided between the inner wall of the cooling cylinder 5 and the outer wall of the spindle 3. At a position corresponding to the circular inner cavity 20 on the cylinder wall of the cooling cylinder 5, there is a coolant inlet 6 that penetrates through the inside and outside. At a position corresponding to the circular inner cavity 20 on the spindle 3, there is a radial through hole 21 communicating with the spindle inner hole 23. A coolant through hole 14 is provided at the central position of the tool. The upper end of the coolant through hole 14 is located at the central position of the tool tip 1 and is open, and the lower end is located at the lower end of the tool holder 2 and is open.

[0024] As Figures 1 - 3 shown, the present utility model also discloses the following various more optimized specific structures:

[0025] In order to facilitate the formation of the circular inner cavity 20 and enable the cooling cylinder 5 to not rotate relative to the spindle 3 for facilitating connection with an external coolant pipe (not shown in the figure), two first bearings 18 arranged vertically are installed between the inner wall of the cooling cylinder 5 and the outer wall of the spindle 3, and a circular inner cavity 20 is formed between the two first bearings 18.

[0026] In order to prevent coolant or external liquid from entering the first bearings 18, first sealing rings 19 are respectively provided at the upper and lower ends of each first bearing 18, and a circular inner cavity 20 is formed between the two first sealing rings 19 that are close to each other. Here, the first sealing ring 19 adopts a rotary sealing ring, that is, a dynamic sealing ring.

[0027] In order to better block external liquid or dust from entering the first bearings 18, an annular cover 17 and an annular retaining ring 16 are respectively provided between the position above the first sealing ring 19 at the uppermost part of the inner wall of the cooling cylinder 5 and the outer wall of the spindle 3, and between the position below the first sealing ring 19 at the lowermost part of the inner wall of the cooling cylinder 5 and the outer wall of the spindle 3. The outer peripheral edge of the annular retaining ring 16 is placed in the corresponding annular groove on the inner wall of the cooling cylinder 5 and presses the corresponding annular cover 17 on the corresponding first sealing ring 19.

[0028] In order to facilitate the installation of the spindle 3 on the machine tool and enable it to rotate freely, a second bearing 9 is sleeved at a position on the spindle 3 below the cooling cylinder 5.

[0029] To facilitate the installation of the second bearing 9, a conical section 7 with a smaller upper part and a larger lower part is provided at the lower part of the cooling cylinder 5. An annular bearing end cover 8 is provided between the conical section 7 and the upper end of the second bearing 9. The edge of the bearing end cover 8 is connected to the outer ring of the second bearing 9. A section of the main shaft 3 corresponding to the second bearing 9 has an increased outer diameter to form a large-diameter section 26, and the inner ring of the second bearing 9 is connected to the outer wall of the large-diameter section 26.

[0030] To more reliably install the second bearing 9 and better connect the conical section 7 of the cooling cylinder 5 with the bearing end cover 8, a retaining ring 30 protruding outward in the circumferential direction is provided at a position above the second bearing 9 in the large-diameter section 26 of the main shaft 3. The upper end of the inner ring of the second bearing 9 is in close contact with the lower surface of the retaining ring 30. A position near the inner wall of the circumference of the bearing end cover 8 protrudes upward and is located within the conical section 7, and a second sealing ring 22 is provided between it and the outer wall of the main shaft 3. A concave ring 24 is provided at the lower end of the conical section 7. A convex ring 25 is provided at a position corresponding to the concave ring 24 on the upper surface of the bearing end cover 8, and the convex ring 25 is placed within the concave ring 24. Here, the second sealing ring 22 is a rotating sealing ring, that is, a dynamic sealing ring.

[0031] To facilitate driving the rotation of the main shaft 3 by means of gear meshing, a driven gear 10 is sleeved on the main shaft 3 near the lower end.

[0032] To facilitate better positioning of the main shaft 3 without affecting its free rotation, a third bearing 12 is sleeved on the main shaft 3 at a position below the driven gear 10. A first external thread 11 is provided on the main shaft 3 at a position above the third bearing 12. A second external thread 31 is provided on the main shaft 3 at a position below the third bearing 12, and a nut 13 is sleeved on it.

[0033] To achieve a better cooling effect, the tool holder 2 and the tool tip 1 are integrally formed. Coolant drainage holes 15 communicating with the coolant through holes 14 and used to drain the coolant to both sides of the tool tip 1 are provided in the tool holder 2. Here, the coolant drainage holes 15 can also be provided at positions near both sides in the tool holder 2 and communicate with the annular inner cavity 20 through connection through holes provided at corresponding positions in the main shaft 3.

[0034] Figures 1 - 3 Also shown in the figure is a lock tool screw hole 4 provided at the upper end of the main shaft 3 for installing a locking screw in the lock tool screw hole 4 to lock the tool holder 2; Figure 3 Also shown in the figure is a non-rotation groove 27 provided at the upper end of the main shaft 3. A first screw hole 28 is provided at the bottom of the non-rotation groove 27. Second screw holes 29 are provided at positions on both sides of the non-rotation groove 27 at the upper end of the main shaft 3. The non-rotation groove 27, the first screw hole 28, and the second screw holes 29 are all used to reliably prevent the tool holder 2 from rotating relative to the main shaft 3, which is a conventional structure.

[0035] As Figures 1 - 4As shown in the figure, during application, the second bearing 9, the bearing end cover 8 and the third bearing 12 are respectively connected to the relevant components of the machine tool, thereby realizing the positioning and installation of the main shaft 3; the outlet of the coolant pipe (not shown in the figure) is connected to the coolant inlet 6, the inlet of the coolant pipe is connected to the outlet of the booster pump (not shown in the figure), and the inlet of the booster pump is connected to the coolant tank, so as to achieve the purpose of pumping the coolant into the inner hole 23 of the main shaft through the coolant inlet 6, the annular inner cavity 20 and the radial through hole 21; the rotating shaft of the machine tool motor 32 is connected through the driving gear 33, and the driving gear 33 is connected to the driven gear 10 through the transmission gear 34, thereby realizing the rotation driving function of the rotating shaft 3; the workpiece to be processed (not shown in the figure) is installed on the machine tool and located above the tool head 1, and the feeding operation of drilling can be realized by moving the main shaft 3 upward or moving the workpiece downward; after starting the relevant equipment, the main shaft 3 drives the tool head 1 to rotate at a high speed to process the workpiece. At the same time, the coolant is sprayed out from the central position at the upper end of the tool head 1 through the coolant through hole 14 to efficiently cool the central position of the processing, achieve the best cooling effect and flush out the chips, and the coolant is sprayed out through the coolant drainage hole 15 to cool the peripheral position of the tool head 1, further improving the cooling effect and chip removal ability.

[0036] The above embodiments are only the preferred embodiments of the present invention, and do not limit the technical solutions of the present invention. Any technical solutions that can be realized on the basis of the above embodiments without creative labor shall be regarded as falling within the scope of the patent rights of the present invention.

Claims

1. A tool and spindle assembly for machine tool processing with high efficiency cooling, comprising a spindle and a tool, wherein one end of the spindle is connected to the tool and the end of the spindle is the upper end, the spindle is provided with a spindle inner hole with an upper end opening and a lower end closed, the upper part of the tool is a tool head, the middle and lower part is a tool seat, and the lower end of the tool seat is placed in the spindle inner hole, characterized in that: The high-efficiency cooling tool and spindle assembly for machine tool processing also includes a cooling cylinder. The cylindrical and axially penetrating cooling cylinder is mounted outside the spindle. An annular inner cavity is provided between the inner wall of the cooling cylinder and the outer wall of the spindle. A coolant inlet that penetrates inside and outside is provided at a position on the wall of the cooling cylinder corresponding to the annular inner cavity. A radial through hole that is connected to the inner hole of the spindle is provided at a position on the spindle corresponding to the annular inner cavity. A coolant through hole is provided at the center of the tool. The upper end of the coolant through hole is located at the center of the tool head and is open, and the lower end is located at the lower end of the tool seat and is open.

2. The high-efficiency cooling machine tool tool and spindle assembly according to claim 1, characterized in that: Two first bearings arranged vertically are installed between the inner wall of the cooling cylinder and the outer wall of the main shaft, and the annular inner cavity is formed between the two first bearings.

3. The high-efficiency cooling machine tool tool and spindle assembly according to claim 2, characterized in that: A first sealing ring is respectively disposed at the upper and lower ends of each first bearing, and the annular inner cavity is formed between two first sealing rings close to each other.

4. The high-efficiency cooling machine tool tool and spindle assembly according to claim 3, characterized in that: An annular blocking cover and an annular blocking ring are respectively provided between a position above the first sealing ring at the top of the inner wall of the cooling cylinder and the outer wall of the main shaft, and between a position below the first sealing ring at the bottom of the inner wall of the cooling cylinder and the outer wall of the main shaft. The outer peripheral edge of the annular blocking ring is placed in a corresponding annular groove on the inner wall of the cooling cylinder and the corresponding annular blocking cover is pressed against the corresponding first sealing ring.

5. The high-efficiency cooling machine tool tool and spindle assembly according to any one of claims 1 to 4, characterized in that: A second bearing is sleeved on the main shaft at a position below the cooling cylinder.

6. The high-efficiency cooling machine tool tool and spindle assembly according to claim 5, characterized in that: A conical section with a smaller upper portion and a larger lower portion is provided at the lower portion of the cooling cylinder, a circular bearing end cover is provided between the conical section and the upper end of the second bearing, an edge of the bearing end cover is connected to the outer ring of the second bearing, a section of the main shaft corresponding to the second bearing has an increased outer diameter to form a large diameter section, and the inner ring of the second bearing is connected to the outer wall of the large diameter section.

7. The high-efficiency cooling machine tool tool and spindle assembly according to claim 6, characterized in that: A retaining ring protruding toward the outer circumferential direction is provided at a position above the second bearing in the large diameter section of the main shaft, and the upper end of the inner ring of the second bearing is in close contact with the bottom of the retaining ring. A second sealing ring is provided on the bearing end cover, which is protruding upward near its circumferential inner wall and is located in the conical section and between the outer wall of the main shaft. A concave ring is provided at the lower end of the conical section, and a convex ring is provided on the upper side of the bearing end cover at a position corresponding to the concave ring, and the convex ring is placed in the concave ring.

8. The high-efficiency cooling machine tool tool and spindle assembly according to any one of claims 1 to 4, characterized in that: A driven gear is sleeved on the main shaft near the lower end.

9. The high-efficiency cooling machine tool tool and spindle assembly according to claim 8, characterized in that: A third bearing is mounted on the main shaft below the driven gear, a first external thread is provided on the main shaft above the third bearing, and a second external thread is provided on the main shaft below the third bearing and is mounted with a nut.

10. The high-efficiency cooling machine tool tool and spindle assembly according to any one of claims 1 to 4, characterized in that: The tool holder is integrally formed with the tool head, and a coolant drainage hole connected with the coolant through hole and used for draining the coolant to both sides of the tool head is provided in the tool holder.

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