Manufacturing Method of a Hydraulic Tool Holder with a Combined Sealing Structure

Abstract

The invention discloses a manufacturing method of a hydraulic tool holder with a combined sealing structure, belonging to the technical field of hydraulic tool holder processing, and solving the problems that the elastic sleeve of the existing hydraulic tool holder is hermetically fixed in the inner cavity of the tool holder body by an integral welding method, resulting in high processing difficulty, high cost, and difficulty in detecting the qualification rate. The method is to first press the elastic sleeve into the tool holder body; then press one end of the elastic sleeve in an interference fit in the inner cavity of the tool holder body; and finally hermetically fix the other end of the elastic sleeve to the tool holder body. The manufacturing method of the hydraulic tool holder of the invention can realize the processing of the hydraulic tool holder with high efficiency and high controllability by using conventional equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic tool shank processing, and more specifically, it relates to a manufacturing method of a hydraulic tool shank with a combined sealing structure. Background Art

[0002] A hydraulic tool shank is a tool shank used in a machining center during machining processes such as drilling, tapping, milling, reaming, and boring, and plays an indispensable role in machining efficiency and accuracy.

[0003] Different from the structure of conventional mechanical clamping, a hydraulic tool shank forms an oil cavity by welding an elastic sleeve inside the tool shank body and simultaneously designs an oil inlet and an oil outlet. During use, after injecting hydraulic oil, the oil outlet is blocked, and a sealing piston is arranged at the oil inlet end to form a sealed oil cavity between the tool shank body and the elastic sleeve. By adjusting the pressure regulating screw at the rear end of the sealing piston at the oil inlet, the hydraulic oil in the sealed oil cavity is compressed, causing the elastic sleeve to deform, thereby clamping the tool inserted into the inner hole of the elastic sleeve through clearance fit.

[0004] The function of the sealed oil cavity inside the hydraulic tool shank is very crucial. Once oil leakage occurs, it will lead to the failure of the tool shank function and then cause damage to the equipment or the machined object. Currently, in the industry, the elastic sleeve is mostly welded to the tool shank body by vacuum brazing. For example, the patent number is: CN108907776A - a composite connection type hydraulic tool shank, which realizes the welding and fixation of both ends of the elastic sleeve through a primary solder ring, a secondary solder ring, and a tertiary solder ring. However, since the elastic sleeve is embedded in the tool shank body, it has high requirements for welding conditions and welding technology. Usually, only vacuum welding can be used, and the cost of vacuum welding equipment is also high, which is difficult for general enterprises to bear. Moreover, due to the relatively high requirements for part cleanliness and welding environment in vacuum brazing, the flux needs to be evenly attached in a gap less than 0.1mm on one side for high-temperature fusion welding, and the internal welding quality is difficult to identify through conventional detection methods, with a low qualified rate and a large rework cost. The process of vacuum brazing ranges from normal temperature to high temperature, then to constant temperature and then to cooling, with a long process time and low efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is in view of the above-mentioned deficiencies of the prior art. The purpose of the present invention is to provide a manufacturing method of a hydraulic tool shank with a combined sealing structure, which can use conventional equipment to achieve high-efficiency and high-control processing of hydraulic tool shanks.

[0006] To achieve the above purpose, the present invention provides a manufacturing method of a hydraulic tool shank with a combined sealing structure. The method is to first press the elastic sleeve into the tool shank body; then press one end of the elastic sleeve tightly in the inner cavity of the tool shank body by interference fit; finally, seal and fix the other end of the elastic sleeve to the tool shank body.

[0007] As a further improvement, it includes the following specific steps:

[0008] S1: Process the tool shank body, elastic sleeve, and clamping washer respectively according to the design drawings.

[0009] S2: Fit a sealing ring onto one end of the elastic sleeve to form an elastic sleeve assembly.

[0010] S3: Press the elastic sleeve assembly in step S2 into the inner cavity of the tool shank body so that the sealing ring is in interference fit with the inner cavity of the tool shank body to form a seal.

[0011] S4: Press the clamping washer into the inner cavity of one end of the elastic sleeve of the elastic sleeve assembly by interference fit, and use the clamping washer to squeeze and expand one end of the elastic sleeve so that the elastic sleeve is in interference fit with the inner cavity of the tool shank body.

[0012] S5: Weld and fix the other end of the elastic sleeve of the elastic sleeve assembly to the end of the tool shank body so that a sealed oil cavity is formed between the sealing ring and the other end of the elastic sleeve to obtain a hydraulic tool shank.

[0013] Further, in step 1, the tool shank body is made of 42CrMo material. The processing of the tool shank body is to first process the inner cavity of the tool shank body. The processing process is to rough - machine the inner - diameter inclined surface, step surface, first inner - diameter surface, second inner - diameter surface, and third inner - diameter surface from the outside to the inside in sequence; then perform quenching and tempering treatment on the tool shank body to HRC38 - 42; finally, finish - machine the inner - diameter inclined surface, step surface, first inner - diameter surface, second inner - diameter surface, and third inner - diameter surface to the standard size in sequence.

[0014] Further, in step 1, the elastic sleeve is made of H13 material. The processing of the elastic sleeve is to first process the outer wall of the elastic sleeve. The processing process is to rough - machine the first outer - diameter surface, second outer - diameter surface, outer - diameter oil groove, inner end surface, and outer - diameter inclined surface in sequence; then process the inner wall of the elastic sleeve. The processing process is to rough - machine the fourth inner - diameter surface and fifth inner - diameter surface in sequence; then perform integral vacuum quenching on the elastic sleeve to HRC55 - 58; finally, finish - machine the outer - diameter wall surface on one side of the outer - diameter oil groove to the standard size.

[0015] Further, the manufacturing method further includes step S6: Finish - machine the fifth inner - diameter surface corresponding to the hydraulic tool shank obtained in step S5 to the standard size.

[0016] Further, the outer - diameter oil groove is processed in a spiral manner to form an outer - diameter wall surface arranged spirally along the axis of the elastic sleeve on one side of it, and the first inner - diameter surface is in interference fit with the outer - diameter wall surface, and the fit tolerance is: 0.008mm - 0.01mm.

[0017] Further, in the step S1, the clamping washer is made of 42CrMo material. The processing of the clamping washer is to first perform quenching and tempering treatment on the blank to HRC28 - 30; then process the extrusion outer wall surface; and finally process the sixth inner diameter surface, and the diameter of the sixth inner diameter surface is 0.2 mm to 0.3 mm larger than the outer diameter of the adjusting screw.

[0018] Further, the extrusion outer wall surface is an arc-shaped curved surface.

[0019] Further, when rough machining the second outer diameter surface of the elastic sleeve, a sealing groove is simultaneously machined; in the step S2, the sealing ring is press-fitted into the sealing groove; when finish machining the second inner diameter surface 23 of the tool holder body 2, the second inner diameter surface is finish machined to a roughness less than Ra1.6.

[0020] Further, in the step S5, the part of the tool holder body except the welding area is immersed in circulating cooling water, and then laser filler welding is used for welding.

[0021] Beneficial Effects

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. For the manufacturing method of the hydraulic tool holder with the combined sealing structure of the present invention, one end of the elastic sleeve is press-fitted and clamped in the tool holder body, and a combined sealing method of using a sealing ring to seal between the elastic sleeve and the inner wall of the tool holder body and then sealing and fixing the other end forms a sealed oil cavity. There is no need to weld the elastic sleeve and the inner cavity of the tool holder body, reducing the processing difficulty. It can use conventional equipment to achieve high-efficiency and high-precision processing of the hydraulic tool holder, reducing the process duration, improving the production and processing efficiency, and facilitating the detection of the hydraulic tool holder to ensure product quality.

[0024] 2. For the manufacturing method of the hydraulic tool holder with the combined sealing structure of the present invention, first press the elastic sleeve into the tool holder body, and then use the clamping washer to squeeze one end of the elastic sleeve to make it expand and have an interference fit in the tool holder body. This manufacturing method is convenient for pressing the elastic sleeve into the tool holder body on the one hand, and on the other hand, it can also make one end of the elastic sleeve always have an interference fit with the inner wall of the tool holder body, with higher connection stability and reliability.

[0025] 3. For the manufacturing method of the hydraulic tool holder with the combined sealing structure of the present invention, by machining an outer diameter oil groove on the outer wall of the elastic sleeve to form an outer diameter wall surface for supporting against the inner wall of the tool holder body, while satisfying the entry of hydraulic oil into the sealed oil cavity, it can prevent the problem that the elastic sleeve becomes thinner and affects the machining accuracy, and at the same time prevent the problem that the sealed oil cavity is suspended and in a long strip structure and affects the finish machining, making the machining more convenient and effectively ensuring the machining accuracy. Description of the Drawings

[0026] Figure 1 is a flow chart of the present invention;

[0027] Figure 2 is a schematic cross-sectional structure diagram of the hydraulic tool holder of the present invention;

[0028] Figure 3 is a schematic cross-sectional structure diagram of the tool holder body of the present invention;

[0029] Figure 4 is a schematic structure diagram of the elastic sleeve of the present invention;

[0030] Figure 5 is a schematic cross-sectional structure diagram of the elastic sleeve of the present invention;

[0031] Figure 6 is a schematic structure diagram of the clamping washer of the present invention.

[0032] Wherein: 2 - tool holder body, 3 - elastic sleeve, 5 - sealing ring, 6 - clamping washer, 12 - welding area, 13 - oil inlet, 14 - oil passage port, 15 - sealed oil cavity, 16 - oil channel, 22 - first inner diameter surface, 23 - second inner diameter surface, 24 - third inner diameter surface, 25 - step surface, 26 - inner diameter inclined surface, 31 - fourth inner diameter surface, 32 - second outer diameter surface, 33 - outer diameter wall surface, 34 - inner end surface, 35 - outer diameter inclined surface, 36 - first outer diameter surface, 41 - sealing groove, 45 - outer diameter oil groove, 46 - fifth inner diameter surface, 47 - groove, 48 - relief groove, 61 - extrusion outer wall surface, 62 - sixth inner diameter surface. Detailed implementation manners

[0033] The present invention will be further described below with reference to specific embodiments in the drawings.

[0034] Refer to Figure 1 - 6 , a manufacturing method of a hydraulic tool holder with a combined sealing structure of the present invention. The method is to first press the elastic sleeve 3 into the tool holder body 2; then press one end of the elastic sleeve 3 in an interference fit in the inner cavity of the tool holder body 2; and finally seal and fix the other end of the elastic sleeve 3 with the tool holder body 2.

[0035] For the manufacturing method of the hydraulic tool holder with a combined sealing structure of the present invention, the elastic sleeve 3 is pressed in an interference fit at one end in the tool holder body 2, and the elastic sleeve 3 and the inner wall of the tool holder body 2 are sealed through the sealing ring 5. The other end is sealed and fixed by a combined sealing method to form the sealed oil cavity 15. There is no need to weld the elastic sleeve 3 and the inner cavity of the tool holder body 2, which reduces the processing difficulty. It can use conventional equipment to achieve high-efficiency and high-precision processing of the hydraulic tool holder, reduce the process duration, improve the production and processing efficiency, and can conveniently detect the hydraulic tool holder to ensure the product quality.

[0036] Specifically, the method includes the following specific steps:

[0037] S1: Process the tool shank body 2, the elastic sleeve 3, and the clamping washer 6 respectively according to the design drawings.

[0038] S2: Fit a sealing ring 5 onto one end of the elastic sleeve 3 to form an elastic sleeve assembly.

[0039] S3: Press the elastic sleeve assembly in step S2 into the inner cavity of the tool shank body 2 so that the sealing ring 5 is in interference fit with the inner cavity of the tool shank body 2 to form a seal.

[0040] S4: Press the clamping washer 6 into the inner cavity of one end of the elastic sleeve 3 of the elastic sleeve assembly with interference. Use the clamping washer 6 to squeeze and expand one end of the elastic sleeve 3 so that the elastic sleeve 3 is in interference fit with the inner cavity of the tool shank body 2, realizing the fixation of one end of the elastic sleeve 3.

[0041] S5: Weld and fix the other end of the elastic sleeve 3 of the elastic sleeve assembly to the end of the tool shank body 2 so that a sealed oil chamber 15 is formed between the sealing ring 5 and the other end of the elastic sleeve 3, obtaining a hydraulic tool shank. In other embodiments, the sealing and fixing of the other end of the elastic sleeve 3 and the tool shank body 2 can also be achieved by means of a gasket and rivets or screws. Obviously, the welding and fixing method has better sealing performance.

[0042] For the manufacturing method of the hydraulic tool shank in this embodiment, first press the elastic sleeve 3 into the tool shank body 2, and then use the clamping washer 6 to squeeze one end of the elastic sleeve 3 to expand it and make it in interference fit in the tool shank body 2. This manufacturing method, on the one hand, is convenient for pressing the elastic sleeve 3 into the tool shank body 2, and on the other hand, it can also make one end of the elastic sleeve 3 always in interference fit with the inner wall of the tool shank body 2, with higher connection stability and reliability.

[0043] Preferably, in step 1, when processing the tool shank body 2, 42CrMo material is used. When processing the tool shank body 2, first process the inner cavity of the tool shank body 2. The processing process is to rough-machine the inner diameter inclined surface 26, the step surface 25, the first inner diameter surface 22, the second inner diameter surface 23, and the third inner diameter surface 24 from the outside to the inside in sequence to meet the pressing-in of the elastic sleeve 3. Then perform quenching and tempering treatment on the tool shank body 2 to HRC38 - 42 to improve the structural strength of the tool shank body 2. Finally, finish-machine the inner diameter inclined surface 26, the step surface 25, the first inner diameter surface 22, the second inner diameter surface 23, and the third inner diameter surface 24 to the standard size. By using the method of quenching and tempering treatment first and then finish-machining, the accuracy of each machining surface can be guaranteed, so as to improve the assembly accuracy of the elastic sleeve 3.

[0044] Preferably, in step 1, when the elastic sleeve 3 is processed, H13 material is used. When processing the elastic sleeve 3, the outer wall of the elastic sleeve 3 is processed first. The processing process is to rough machine the first outer diameter surface 36, the second outer diameter surface 32, the outer diameter oil groove 45, the inner end surface 34, and the outer diameter inclined surface 35 in sequence to meet the fitting and pressing of the elastic sleeve 3 and the tool holder body 2. Then, the inner wall of the elastic sleeve 3 is processed. The processing process is to rough machine the fourth inner diameter surface 31 and the fifth inner diameter surface 46 in sequence to meet the assembly of the clamping washer 6 and the tool. By using the method of machining the outer circle first and then the inner circle, the problem that the elastic sleeve deforms during the turning of the outer circle and affects the coaxiality can be prevented. Then, the elastic sleeve 3 is integrally vacuum quenched to HRC55 - 58 to improve the structural strength of the elastic sleeve 3. Finally, the outer diameter wall surface 33 on one side of the outer diameter oil groove 45 is finish machined to the standard size to ensure that the outer diameter wall surface 33 can contact the first inner diameter 22 of the tool holder body 2 to form a support.

[0045] Preferably, the manufacturing method further includes step S6: Finish machining the fifth inner diameter surface 46 of the hydraulic tool holder obtained in step S5 to the standard size. By using the method of finish machining the fifth inner diameter surface 46 after completely assembling the elastic sleeve 3 on the tool holder body 2, the coaxiality of the fifth inner diameter surface 46 and the tool holder body 2 can be guaranteed, and further the coaxiality of the tool after clamping and the tool holder body 2 can be guaranteed, effectively improving the machining accuracy of the tool.

[0046] Preferably, the outer diameter oil groove 45 is machined in a spiral manner to form an outer diameter wall surface 33 that is axially spirally arranged along the elastic sleeve 3 on one side, and there is an interference fit between the first inner diameter surface 22 and the outer diameter wall surface 33. The fit tolerance is: 0.008 mm - 0.01 mm, which can ensure that the elastic sleeve 3 can be easily pressed in and at the same time ensure that the outer diameter wall surface 33 abuts tightly against the first inner diameter surface 22 of the tool holder body 2.

[0047] In this embodiment, by machining an outer diameter oil groove 45 on the outer wall of the elastic sleeve 3 to form an outer diameter wall surface 33 for supporting the inner wall of the tool holder body 2, while meeting the entry of hydraulic oil into the sealing oil cavity 15, the problem that the elastic sleeve 3 becomes thinner and affects the machining accuracy can be prevented. At the same time, the problem that the sealing oil cavity 15 is suspended and has a long strip structure and affects the finish machining can also be prevented, which is more convenient for machining and effectively guarantees the machining accuracy.

[0048] Preferably, in step S1, when the clamping washer 6 is processed, 42CrMo material is used. The processing of the clamping washer 6 is to first perform quenching and tempering treatment on the blank to HRC28 - 30 to improve the structural strength of the clamping washer 6; then process the extrusion outer wall surface 61 so that the clamping washer 6 can be pressed into the elastic sleeve 3; finally process the sixth inner diameter surface 62. In the prior art, when installing the hydraulic tool holder, an adjusting screw is also required to pass through the tool holder body 2 and be connected to the machine tool spindle. Therefore, the diameter of the sixth inner diameter surface 62 is 0.2 mm - 0.3 mm larger than the outer diameter of the adjusting screw to ensure that the adjusting screw can pass through the clamping washer 6 to avoid interference; at the same time, the structural strength of the clamping washer 6 should also be ensured to prevent the clamping washer 6 from deforming during pressing and affecting the precision of the interference fit.

[0049] Preferably, considering the interference fit between the clamping washer 6 and the fourth inner diameter surface 31 of the elastic sleeve 3, the extrusion outer wall surface 61 is set as an arc-shaped curved surface to reduce the effective stress area of the interference fit and make it more convenient for the clamping washer 6 to be pressed in.

[0050] Preferably, when rough machining the second outer diameter surface 32 of the elastic sleeve 3, the sealing groove 41 is machined at the same time; in step S2, the sealing ring 5 is interference-fitted into the sealing groove 41 to prevent the sealing ring 5 from shifting; when finish machining the second inner diameter surface 23 of the tool holder body 2, the second inner diameter surface 23 is finish machined to a roughness less than Ra1.6 to make the second inner diameter surface 23 smoother and improve the sealing performance between the sealing ring 5 and the second inner diameter surface 23.

[0051] Preferably, to protect the sealing ring 5 and prevent the elastic sleeve 3 from high-temperature tempering, in step S5, the part of the tool holder body 2 except the welding area 12 is immersed in circulating cooling water, and then laser filling welding is used for welding. This can prevent the problem that the sealing ring 5 is damaged due to softening during heat preservation, and at the same time prevent the elastic sleeve 3 from annealing and ensure the structural strength of the elastic sleeve 3. In other embodiments, the welding can also be arc welding, brazing, etc. Obviously, laser filling welding is more convenient to operate and has lower cost.

[0052] Preferably, when rough machining the fourth inner diameter surface 31 and the fifth inner diameter surface 46 of the elastic sleeve 3, the tool withdrawal groove 48 is machined at the same time to facilitate tool withdrawal during machining, and at the same time the spiral groove 47 is machined to play a role in accommodating impurities. When installing the tool, the outer wall of the tool contacts the fifth inner diameter surface 46 of the elastic sleeve 3, and the impurities remaining on the outer wall of the tool or the fifth inner diameter surface 46 can be pushed into the groove 47, effectively improving the stability and firmness of tool clamping.

[0053] Preferably, after the machining of the inner cavity of the tool holder body 2 is completed, the oil inlet 13, the oil passage 16 and the oil passing port 14 are machined on the tool holder body 2 in sequence to realize the introduction of high-pressure oil into the sealed oil cavity 15.

[0054] A hydraulic tool holder with a combined sealing structure processed by the above manufacturing method includes a tool holder body 2 and an elastic sleeve 3. Among them, the elastic sleeve 3 is inserted into the tool holder body 2. An interference fit is provided between one end of the elastic sleeve 3 and one end of the inner wall of the tool holder body 2 to fix one end of the elastic sleeve 3 inside the tool holder body 2. And a sealing ring 5 is provided between one end of the elastic sleeve 3 and the inner wall of the tool holder body 2, so that a seal is formed between one end of the elastic sleeve 3 and the inner wall of the tool holder body 2. The other end of the elastic sleeve 3 is fixedly connected to the other end of the inner wall of the tool holder body 2 in a sealed manner, realizing the sealing and fixing between the other end of the elastic sleeve 3 and the tool holder body 2, and forming a sealed oil cavity 15 between the outer wall of the elastic sleeve 3 and the inner wall of the tool holder body 2. An oil inlet passage communicating with the sealed oil cavity 15 is provided on the tool holder body 2. Specifically, the oil inlet passage includes an oil inlet 13, an oil passage 16 and an oil passing port 14. Among them, the oil inlet 13, the oil passage 16, the oil passing port 14 and the sealed oil cavity 15 are connected in sequence. During use, high-pressure oil enters the sealed oil cavity 15 through the oil inlet 13, the oil passage 16 and the oil passing port 14, and the elastic sleeve can be expanded, thereby clamping the tool in the elastic sleeve 3.

[0055] Preferably, a first outer diameter surface 36 is provided at one end of the outer wall of the elastic sleeve 3. Correspondingly, a third inner diameter surface 24 is provided at one end of the inner wall of the tool holder body 2. The first outer diameter surface 36 is inserted into the third inner diameter surface 24 by interference fit to fix one end of the elastic sleeve 3. Further, a fourth inner diameter surface 31 is provided at one end of the inner wall of the elastic sleeve 3. The diameter of the first outer diameter surface 36 is smaller than the diameter of the third inner diameter surface 24, which is convenient for pressing the elastic sleeve 3 into. A clamping washer 6 is inserted into the fourth inner diameter surface 31 by interference fit, and the first outer diameter surface 36 is pressed and expanded by the clamping washer 6 and pressed tightly in the third inner diameter surface 24.

[0056] The hydraulic tool holder of this embodiment adopts a structure in which the clamping washer 6 squeezes one end of the elastic sleeve 3 to expand it and then fits it into the tool holder body 2 by interference. On the one hand, the diameter of the first outer diameter surface 36 can be designed to be smaller, which is convenient for pressing the elastic sleeve 3 into the tool holder body 2. On the other hand, it can also make one end of the elastic sleeve 3 and the inner wall of the tool holder body 2 always maintain an interference fit, and the connection stability and reliability are higher.

[0057] Preferably, a second outer diameter surface 32 is provided on the outer wall of the elastic sleeve 3 on one side of the first outer diameter surface 36. A sealing groove 41 is provided on the second outer diameter surface 32. The sealing ring 5 is sleeved in the sealing groove 41 by interference fit to prevent the sealing ring 5 from moving. Correspondingly, a second inner diameter surface 23 is provided on the inner wall of the tool holder body 2 on one side of the third inner diameter surface 24. The roughness of the second inner diameter surface 23 is less than Ra1.6. The sealing ring 5 is in interference fit with the second inner diameter surface 23, making the second inner diameter surface 23 smoother and improving the sealing performance between the sealing ring 5 and the second inner diameter surface 23.

[0058] Preferably, an outer diameter wall surface 33 that divides the sealed oil cavity 15 into two cavities is provided on the outer wall of the middle part of the elastic sleeve 3. Correspondingly, a first inner diameter surface 22 is provided on the inner wall of the middle part of the tool holder body 2, and an interference fit is provided between the outer diameter wall surface 33 and the first inner diameter surface 22. Further, the outer diameter wall surface 33 is a spiral surface that spirally extends along the axial direction of the elastic sleeve 3, and an outer diameter oil groove 45 that communicates the two cavities is provided on one side of the outer diameter wall surface 33.

[0059] In this embodiment, by machining the outer diameter oil groove 45 on the outer wall of the elastic sleeve 3 to form the outer diameter wall surface 33 for supporting with the inner wall of the tool holder body 2, while satisfying the entry of hydraulic oil into the two cavities corresponding to the sealed oil cavity 15, the problem that the elastic sleeve becomes thinner and affects the machining accuracy can be prevented. At the same time, the problem that the sealed oil cavity 15 is suspended and has a long strip structure and affects the finish machining can also be prevented, which is more convenient for machining and effectively guarantees the machining accuracy. And for the two clamping point positions formed by the two cavities, compared with the existing long strip oil groove clamping method, while satisfying the tool clamping, the contact area between the elastic sleeve and the tool is reduced, thereby reducing the problem that the residual substances on the outer wall of the tool or the inner wall of the elastic sleeve 3 affect the clamping or coaxiality.

[0060] Preferably, an inner end surface 34 is provided at the other end of the elastic sleeve 3. Correspondingly, a step surface 25 is provided at the other end of the tool holder body 2. Among them, the inner end surface 34 is in fit with the step surface 25. Through the cooperation of the inner end surface 34 and the step surface 25, the pressing depth of the elastic sleeve 3 can be limited, and the elastic sleeve 3 can be quickly pressed in place.

[0061] Preferably, an outer diameter inclined surface 35 is provided at the end of the other end of the elastic sleeve 3. Correspondingly, an inner diameter inclined surface 26 is provided at the end of the other end of the tool holder body 2. A welding area 12 is formed between the outer diameter inclined surface 35 and the inner diameter inclined surface 26, which is convenient for laser filling welding.

[0062] Preferably, the depths of the two cavities corresponding to the sealed oil cavity 15 are greater than the depth of the outer diameter oil groove 45, so that the thickness of the positions corresponding to the two cavities is relatively thinner, while the thickness of the position corresponding to the outer diameter oil groove 45 is relatively thicker. In this way, the positions corresponding to the two cavities are more likely to deform, thereby clamping the tool, while the position corresponding to the outer diameter oil groove 45 is relatively not easy to deform. Furthermore, the outer diameter wall surface 33 can be well supported on the first inner diameter surface 22 of the tool holder body 2, effectively guaranteeing the stability of tool clamping.

[0063] Preferably, an arc-shaped extrusion outer wall surface 61 is provided on the outer wall of the clamping washer 6, and a sixth inner diameter surface 62 is provided inside the clamping washer 6. The diameter of the sixth inner diameter surface 62 is 0.2 mm to 0.3 mm larger than the outer diameter of the adjusting screw.

[0064] In this embodiment, an interference fit is adopted between the arc-shaped extrusion outer wall surface 61 and the fourth inner diameter surface 31 of the elastic sleeve 3, which can reduce the effective stress area of the interference fit and make it more convenient to press-fit the clamping washer 6. At the same time, by defining the size of the sixth inner diameter surface 62, it is ensured that the adjusting screw can pass through the clamping washer 6 to avoid interference; at the same time, the structural strength of the clamping washer 6 should also be ensured to prevent the clamping washer 6 from deforming during press-fitting and affecting the accuracy of the interference fit.

[0065] As shown in Tables 1-3 below, after the sealing performance test of the hydraulic tool holder (by applying pressure to the sealed oil cavity after assembly and under load to detect whether the sealed oil cavity leaks), the anti-torque test (by applying torque to the elastic sleeve after assembly to detect whether the elastic sleeve loosens), and the anti-tensile test (by applying axial tension to the elastic sleeve after assembly to detect whether the elastic sleeve loosens), it can be seen that the hydraulic tool holder in this embodiment can meet the actual use requirements in terms of sealing performance, anti-torque performance, and anti-tensile performance while achieving the effects of convenient manufacturing, low cost, and improved processing efficiency. It has the characteristics of batch production and economy.

[0066] Table 1: Sealing performance test of the sealed oil cavity under load

[0067] Pressure (MPa) 0.2 0.5 1 1.5 2 2.5 3 Whether there is leakage No No No No No No No

[0068] Table 2: Anti-torque test of the elastic sleeve

[0069] Torque (N·m) 8 12 15 20 30 45 60 Whether it is loose No No No No No No Yes

[0070] Table 3: Anti-tensile test of the elastic sleeve

[0071] Tensile force (N) 100 150 200 250 300 400 500 Whether it is loose No No No No No No Yes

[0072] The above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which will not affect the implementation effect of the present invention and the practicality of the patent.

Claims

1. A manufacturing method of a hydraulic tool holder with a combined sealing structure, characterized in that, The method is to first press the elastic sleeve (3) into the tool shank body (2); then press one end of the elastic sleeve (3) in an interference fit into the inner cavity of the tool shank body (2); finally, seal and fix the other end of the elastic sleeve (3) to the tool shank body (2), including the following specific steps: S1: Process the tool shank body (2), elastic sleeve (3) and clamping washer (6) respectively according to the design drawings; S2: Fit a sealing ring (5) onto one end of the elastic sleeve (3) to form an elastic sleeve assembly; S3: Press the elastic sleeve assembly in step S2 into the inner cavity of the tool shank body (2) so that the sealing ring (5) is in an interference fit with the inner cavity of the tool shank body (2) to form a seal; S4: Press the clamping washer (6) into the inner cavity of one end of the elastic sleeve (3) of the elastic sleeve assembly in an interference fit, and use the clamping washer (6) to squeeze and expand one end of the elastic sleeve (3) so that the elastic sleeve (3) is in an interference fit with the inner cavity of the tool shank body (2); S5: Weld and fix the other end of the elastic sleeve (3) of the elastic sleeve assembly to the end of the tool shank body (2) so that a sealed oil cavity (15) is formed between the sealing ring (5) and the other end of the elastic sleeve (3) to obtain a hydraulic tool shank.

2. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 1, characterized in that, In the step S1, the tool shank body (2) is made of 42CrMo material. The processing of the tool shank body (2) is to first process the inner cavity of the tool shank body (2). The processing process is to successively rough-machine an inner diameter inclined surface (26), a stepped surface (25), a first inner diameter surface (22), a second inner diameter surface (23) and a third inner diameter surface (24) from the outside to the inside; then perform a quenching and tempering treatment on the tool shank body (2) to HRC38 - 42; finally, perform finish machining on the inner diameter inclined surface (26), stepped surface (25), first inner diameter surface (22), second inner diameter surface (23) and third inner diameter surface (24) to the standard dimensions.

3. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 2, characterized in that, In the step S1, the elastic sleeve (3) is made of H13 material. The processing of the elastic sleeve (3) is to first process the outer wall of the elastic sleeve (3). The processing process is to successively rough-machine a first outer diameter surface (36), a second outer diameter surface (32), an outer diameter oil groove (45), an inner end surface (34), an outer diameter inclined surface (35); then process the inner wall of the elastic sleeve (3). The processing process is to successively rough-machine a fourth inner diameter surface (31) and a fifth inner diameter surface (46); then perform an overall vacuum quenching on the elastic sleeve (3) to HRC55 - 58; finally, perform finish machining on the outer diameter wall surface (33) on one side of the outer diameter oil groove (45) to the standard dimensions.

4. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 3, characterized in that, The manufacturing method further includes step S6: Finish machining the fifth inner diameter surface (46) corresponding to the hydraulic tool shank obtained in step S5 to the standard dimensions.

5. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 3, characterized in that, The outer diameter oil groove (45) is machined in a spiral manner to form an outer diameter wall surface (33) arranged spirally along the axis of the elastic sleeve (3) on one side thereof, and the first inner diameter surface (22) is in an interference fit with the outer diameter wall surface (33), and the fit tolerance is: 0.008 mm - 0.01 mm.

6. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 3, characterized in that, In the step S1, the clamping washer (6) is made of 42CrMo material. For the processing of the clamping washer (6), the blank is first quenched and tempered to HRC28 - 30; then the extrusion outer wall surface (61) is machined; finally, the sixth inner diameter surface (62) is machined, and the diameter of the sixth inner diameter surface (62) is 0.2 mm - 0.3 mm larger than the outer diameter of the adjusting screw.

7. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 6, characterized in that, The extrusion outer wall surface (61) is an arc-shaped curved surface.

8. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to claim 3, characterized in that, When rough machining the second outer diameter surface (32) of the elastic sleeve (3), the sealing groove (41) is machined simultaneously; in the step S2, the sealing ring (5) is press-fitted into the sealing groove (41); when finish machining the second inner diameter surface (23) of the tool shank body (2), the second inner diameter surface (23) is finish machined to a roughness less than Ra1.

6.

9. The manufacturing method of a hydraulic tool holder with a combined sealing structure according to any one of claims 1-8, characterized in that, In the step S5, the part of the tool shank body (2) except the welding area (12) is immersed in circulating cooling water, and then laser filler welding is carried out.

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