Deep blind hole grinding method and grinding device

Abstract

The invention relates to a deep blind hole grinding method and a grinding device, the grinding device comprises a working table and a main shaft, a positioning tool is arranged on the working table, the main shaft is connected with a detachable first grinding tool or a detachable second grinding tool, and the length of the first grinding tool is smaller than that of the second grinding tool; the second grinding tool comprises a connecting rod, one end of the connecting rod is provided with a connector, the outer wall of the other end of the connecting rod is sleeved with a grinding tool, the connecting rod between the connector and the grinding tool is sleeved with a supporting sleeve, the supporting sleeve is in clearance fit with the connecting rod, and the end, facing the connector, of the supporting sleeve is connected with a positioning mechanism. The supporting sleeve extending into the blind hole is used for supporting the connecting rod, the stability of the connecting rod can be improved, bending deformation of the connecting rod is prevented, vibration of the connecting rod is reduced, and therefore the grinding precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding, in particular to a deep blind hole grinding method and a grinding device. Background Art

[0002] Some parts need to process deep blind holes. When the accuracy requirements of blind holes are high, turning, drilling, boring and other processing methods are difficult to achieve the accuracy requirements. Therefore, after the basic hole is processed, the blind hole needs to be ground. When the blind hole is deep, for example, the aspect ratio is greater than 30, the grinding difficulty is higher.

[0003] The invention patent with application number CN202110663873.0 discloses a grinding method and tooling for improving the roughness of deep holes in connecting rods of large diesel engines, including a supporting and guiding component, a grinding tool, a drill rod, a connecting handle and two V-shaped irons; the two V-shaped irons are placed on a gantry milling machine, and the connecting rod is placed on the two V-shaped irons. The supporting and guiding component is connected to the connecting rod for supporting and positioning the drill rod. One end of the drill rod is connected to the main shaft of the gantry milling machine through the connecting handle, and the other end is connected to the grinding tool. One end of the grinding tool and the drill rod passes through the supporting and guiding component and extends into the deep hole, and the guide sleeve, the grinding tool, the drill rod and the connecting handle are coaxial with the axis of the deep hole and the X-axis of the gantry milling machine; the rotation and feed motion of the X-axis of the gantry milling machine drives the grinding tool to grind the hole wall of the deep hole so that the roughness of the deep hole after processing meets the technical requirements. Although the device reduces the vibration and deflection of the drill rod during processing by means of a guide sleeve, the guide sleeve is installed outside the deep hole, so the shock absorption effect is poor, and most of the drill rod is located inside the deep hole. Due to the large length of the drill rod, the drill rod inside the deep hole has poor stability and is easily deformed, making it difficult to ensure grinding accuracy. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a deep blind hole grinding method and a grinding device, which can improve the stability of the grinding tool and further improve the grinding accuracy.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a deep blind hole grinding method, comprising:

[0006] S1, using the first grinding tool to perform a grinding operation, the grinding operation starts from the opening of the blind hole, and the grinding depth is 1 / 3 to 1 / 2 of the depth of the blind hole;

[0007] S2. Use a second grinding tool to perform secondary grinding on the unground portion of the blind hole, wherein the second grinding tool includes a connecting rod, a connecting head is provided at one end of the connecting rod, a grinding tool is provided on the outer wall of the other end of the connecting rod, and a supporting sleeve is provided on the outer sleeve of the connecting rod between the connecting head and the grinding tool, wherein one end of the supporting sleeve is located outside the blind hole, and the other end extends into the blind hole.

[0008] Furthermore, one end of the support sleeve located outside the blind hole is connected to a driving mechanism for driving the support sleeve to move axially. During secondary grinding, the grinding tool is fed toward the bottom of the blind hole, and the driving mechanism pushes the support sleeve to move toward the inside of the blind hole.

[0009] The grinding device comprises a work surface and a spindle, wherein a positioning tool is arranged on the work surface.

[0010] The spindle is connected with a detachable first grinding tool or a second grinding tool, and the length of the first grinding tool is shorter than the length of the second grinding tool;

[0011] The second grinding tool includes a connecting rod, a connecting head is provided at one end of the connecting rod, a grinding tool is provided on the outer wall of the other end of the connecting rod, a supporting sleeve is provided on the outer sleeve of the connecting rod between the connecting head and the grinding tool, the supporting sleeve is clearance-matched with the connecting rod, and a positioning mechanism is connected to the end of the supporting sleeve facing the connecting head.

[0012] Furthermore, the positioning mechanism includes a slide seat, the slide seat is slidably matched with the work surface, and the slide seat is connected to a driving mechanism; a positioning sleeve is provided on the slide seat, and the support sleeve is located in the positioning sleeve and fixedly connected to the positioning sleeve.

[0013] Furthermore, the driving mechanism is a hydraulic cylinder.

[0014] Furthermore, a cooling medium passage is provided in the connecting rod, an inlet is provided at one end of the connecting rod located at the connector, the inlet is connected to the cooling medium passage, an outlet is provided on one end face of the connecting rod located at the mold, the outlet is connected to the cooling medium passage; a cooling groove axially penetrating the mold is provided on the outer wall of the mold, and a cooling medium discharge passage is provided on the support sleeve.

[0015] Furthermore, a plurality of heat-conducting tubes are arranged inside the connecting rod in the mold, one end of each heat-conducting tube is connected to the cooling medium inlet channel, and the other end is in contact with the inner wall of the mold; the heat-conducting tube is filled with a liquid working fluid at room temperature, and the inner cavity of the heat-conducting tube is under negative pressure at room temperature.

[0016] Furthermore, a third sealing structure is provided on the inner wall of one end of the support sleeve facing the mold.

[0017] Furthermore, the cooling medium discharge channel includes a first trough body, a second trough body and a discharge port, the first trough body is located on the outer wall of the support sleeve facing the mold, and the bottom wall of the first trough body is provided with a plurality of filter holes; the second trough body is located on the inner wall of the support sleeve, and one end of the second trough body is connected with the filter hole, and the other end is connected with the discharge port; the discharge port is located at the end of the support sleeve facing the connector; a first sealing structure is provided on the outer wall of the support sleeve between the discharge port and the first trough body, a second sealing structure is provided on the inner wall of the support sleeve at the end away from the mold, and the second trough body is located between the second sealing structure and the third sealing structure; a pressure reducing valve is provided in the discharge port.

[0018] The beneficial effect of the present invention is that the present invention firstly uses a conventional first grinding tool to grind a section of the blind hole near the hole mouth, and the grinding depth is a conventional depth. Therefore, the conventional first grinding tool can be completed by using the existing grinding method, and the grinding difficulty is relatively low.

[0019] After one grinding is completed, the first grinding tool is replaced with the second grinding tool. The connector of the second grinding tool is connected to the rotating shaft of the grinder. The connecting rod passes through the support sleeve and the mold is inserted into the blind hole. During grinding, the rotating shaft drives the connecting rod and the mold to rotate, and the grinder drives the connecting rod and the mold to feed axially to complete the grinding of the remaining parts. Since the connecting rod is supported by the support sleeve extending into the blind hole, the stability of the connecting rod can be improved, the bending and deformation of the connecting rod can be prevented, and the vibration of the connecting rod can be reduced, thereby improving the grinding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the grinding device of the present invention when performing one grinding operation;

[0021] Figure 2 is a schematic diagram of a grinding device for secondary grinding according to the present invention;

[0022] Figure 3 is a schematic diagram of the cooperation between the second grinding tool and the support sleeve;

[0023] Figure 4 yes Figure 3 Schematic cross-sectional view of AA in the figure;

[0024] Figure 5 yes Figure 3 A magnified schematic diagram of part B;

[0025] Figure 6 yes Figure 3 A magnified schematic diagram of part C;

[0026] Figure numerals: 1—connecting rod; 2—connecting head; 3—grinding tool; 4—support sleeve; 5—slide seat; 6—positioning sleeve; 7—hydraulic cylinder; 8—cooling medium inlet channel; 9—inlet; 10—outlet; 11—cooling trough; 12—cooling medium discharge channel; 121—first trough body; 122—second trough body; 123—discharge port; 124—pressure reducing valve; 125—first sealing structure; 126—second sealing structure; 127—third sealing structure; 13—heat conducting pipe; 100—working table; 110—spindle; 120—positioning fixture; 130—first grinding tool. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] The deep blind hole grinding method of the present invention comprises:

[0029] S1. Perform a grinding operation using the first grinding tool 130. The grinding operation starts from the opening of the blind hole, and the grinding depth is 1 / 3 to 1 / 2 of the depth of the blind hole.

[0030] During the first grinding, the grinding depth is small, the difficulty is relatively low, and the grinding accuracy is controllable. Therefore, the first grinding tool 130 can be a conventional grinding tool, and the grinding machine used for the first grinding is a conventional grinding machine, such as Figure 1 As shown, the grinding process can adopt conventional process.

[0031] S2. Use a second grinding tool to perform secondary grinding on the unground portion of the blind hole, the second grinding tool includes a connecting rod 1, a connecting head 2 is provided at one end of the connecting rod 1, a grinding tool 3 is provided on the outer wall of the other end of the connecting rod 1, a supporting sleeve 4 is provided on the outer sleeve of the connecting rod 1 between the connecting head 2 and the grinding tool 3, one end of the supporting sleeve 4 is located outside the blind hole, and the other end extends into the blind hole.

[0032] Secondary grinding is used to grind the remaining hole wall of the blind hole. The second grinding tool uses a special tool, specifically, Figure 2 As shown, the connector 2 of the connecting rod 1 is used to connect with the main shaft 110 of the grinding machine, and the main shaft 110 can drive the connecting rod 1 to rotate in height. In addition, the main shaft 110 is installed on a slide, and the slide can drive the main shaft 110 and the connecting rod 1 to move axially to achieve feeding and retracting. The inner wall of the grinding tool 3 is fixedly connected to the connecting rod 1, and the grinding tool 3 can rotate and move axially with the connecting rod 1. The outer wall of the grinding tool 3 is provided with an abrasive layer, and the abrasive layer can use various existing abrasives.

[0033] When grinding the inside of a deep blind hole, the connecting rod 1 is relatively long and has a relatively large overall deflection, which is prone to bending, deformation, and vibration during grinding. In the present invention, a support sleeve 4 is arranged inside the deep hole, and the support sleeve 4 supports the connecting rod 1, which can reduce the deflection of the connecting rod 1 and improve the stability of the connecting rod 1, thereby ensuring the stability of the mold 3 and improving the grinding quality. The support sleeve 4 is a circular sleeve of a certain length, and the supporting length of the connecting rod 1 is relatively long, and the support sleeve 4 extends into the inside of the blind hole, which reduces the cantilever length of the connecting rod 1 outside the support sleeve 4 and improves the supporting effect. The inner and outer walls of the support sleeve 4 are smooth, which reduces the friction between the connecting rod 1 and the support sleeve 4.

[0034] During secondary grinding, the grinding tool 3 enters the blind hole, and the spindle 110 drives the connecting rod 1 and the grinding tool 3 to rotate, and the grinding tool 3 grinds the inner wall of the blind hole, while driving the grinding tool 3 to feed axially until the grinding tool 3 reaches the bottom of the blind hole.

[0035] One end of the support sleeve 4 outside the blind hole is connected to a driving mechanism for driving the support sleeve 4 to move axially. During secondary grinding, the grinding tool 3 is fed toward the bottom of the blind hole, and the driving mechanism pushes the support sleeve 4 to move toward the inside of the blind hole. At the beginning of secondary grinding, most of the connecting rod 1 is outside the blind hole. At this time, the support sleeve 4 is also partially outside the blind hole. As the connecting rod 1 gradually enters the blind hole, the driving mechanism pushes the support sleeve 4 to gradually enter the blind hole to ensure that the support sleeve 4 can stably support the connecting rod 1. The clearance between the connecting rod 1 and the support sleeve 4 is matched, and the axial movement speed of the support sleeve 4 can be consistent with the axial feed speed of the connecting rod 1, or it can be inconsistent.

[0036] The grinding device of the present invention, Figure 1 and Figure 2 As shown, it includes a work surface 100 and a spindle 110, and a positioning tool 120 is arranged on the work surface 100. The spindle 110 is connected with a detachable first grinding tool 130 or a second grinding tool, and the length of the first grinding tool 130 is less than the length of the second grinding tool.

[0037] A slide is provided on the work surface 100 , and the slide can drive the main shaft 110 to move axially, and the main shaft 110 can rotate at the same time.

[0038] The positioning tool 120 is used to position the parts, and commonly used positioning methods can be used. For example, when the part is a shaft part and the deep blind hole is the center hole of the shaft part, a three-jaw chuck or a similar positioning mechanism can be used to clamp and position the shaft part; when the part is a plate or a box, a clamping positioning method is used to press and fix the part to the work table 100.

[0039] During one grinding, Figure 1 As shown, the first grinding tool 130 is mounted on the spindle 110; during the secondary grinding, as shown in Figure 2As shown, the second grinding tool is mounted on the spindle 110. Since the first grinding is to grind the portion of 1 / 3 to 1 / 2 depth of the blind hole opening, the length of the first grinding tool 130 is smaller than that of the second grinding tool, and the first grinding tool 130 can be a conventional grinding tool.

[0040] The second grinding tool includes a connecting rod 1, a connecting head 2 is provided at one end of the connecting rod 1, a grinding tool 3 is provided on the outer wall of the other end of the connecting rod 1, and the grinding tool 3 can be installed on the connecting rod 1 by multiple screws. A supporting sleeve 4 is provided on the outer shell of the connecting rod 1 between the connecting head 2 and the grinding tool 3. The supporting sleeve 4 is clearance-matched with the connecting rod 1, and a positioning mechanism is connected to the support sleeve 4 toward one end of the connecting head 2.

[0041] The support sleeve 4 is used to support the position of the connecting rod 1 close to the mold 3, and can limit the position of the connecting rod 1, limit the vibration of the connecting rod 1, and reduce the deflection of the connecting rod 1, thereby improving the movement accuracy of the mold 3 and ensuring the grinding accuracy. The positioning mechanism is used to position the support sleeve 4 to prevent the support sleeve 4 from disorderly axial movement and rotation.

[0042] During secondary grinding, first pass the connecting rod 1 through the support sleeve 4, then install the grinding tool 3 to the grinding end of the connecting rod 1, then install the connector 2 at the other end of the connecting rod 1 to the spindle 110, and then use the positioning fixture 120 to fix the part to ensure that the deep blind hole to be ground on the part, the connecting rod 1 and the spindle 110 are coaxial, then drive the grinding tool 3 to extend into the blind hole and move to the unground part, and at the same time extend the support sleeve 4 into the blind hole, and then use the spindle 110 to drive the connecting rod 1 and the grinding tool 3 to rotate, and the grinding tool 3 can grind the wall of the blind hole. During grinding, the spindle 110 drives the connecting rod 1 and the grinding tool 3 to feed axially and move toward the bottom of the blind hole until the entire blind hole is ground.

[0043] The primary grinding and the secondary grinding can be performed on the same grinding machine or on different grinding machines.

[0044] In the present invention, the positioning mechanism can be a positioning member fixed on the work surface 100, and the position of the support sleeve 4 remains fixed. In the process of axial feeding of the connecting rod 1, in order to ensure that the support sleeve 4 can always stably support the connecting rod 1, the positioning mechanism includes a slide 5, the slide 5 is slidably matched with the work surface 100, and the slide 5 is connected to a driving mechanism; a positioning sleeve 6 is provided on the slide 5, and the support sleeve 4 is located in the positioning sleeve 6 and is fixedly connected to the positioning sleeve 6.

[0045] The driving mechanism can drive the slide 5 to move, and the moving direction of the slide 5 is consistent with the axial direction of the main shaft 110. As the connecting rod 1 gradually enters the blind hole, the driving mechanism pushes the support sleeve 4 to gradually enter the blind hole, thereby preventing the cantilever length of the connecting rod 1 extending out of the support sleeve 4 from gradually increasing, thereby preventing the deflection of the connecting rod 1 from increasing. In the present invention, the driving mechanism is a hydraulic cylinder 7, and existing facilities such as a cylinder and a linear motor may also be used.

[0046] During grinding, a large amount of heat is generated on the surface of the grinding tool 3, which causes the temperature of the grinding tool 3 to rise. At the same time, grinding will produce grinding chips. In order to promote the heat dissipation of the grinding tool 3 and clean the grinding chips on the surface of the grinding tool 3, the present invention is provided with a cooling medium passage 8 in the connecting rod 1, and an inlet 9 is provided at one end of the connecting head 2, and the inlet 9 is connected to the cooling medium passage 8. The end face of the connecting rod 1 at one end of the grinding tool 3 is provided with an outlet 10, and the outlet 10 is connected to the cooling medium passage 8; the outer wall of the grinding tool 3 is provided with a cooling groove 11 axially penetrating the grinding tool 3, and the support sleeve 4 is provided with a cooling medium discharge channel 12.

[0047] The cooling medium is usually a coolant, which can be pumped into the inlet 9, then moves along the cooling medium inlet channel 8 to the grinding end of the connecting rod 1, then is discharged from the outlet 10 into the blind hole, then flows to the cooling tank 11 to cool the grinding tool 3, then flows to the support sleeve 4, and finally is discharged along the cooling medium discharge channel 12. During the flow of the coolant, it can not only take away the heat on the surface of the grinding tool 3, but also take away the generated grinding chips.

[0048] The cooling medium passage 8 is coaxial with the connecting rod 1. When the cooling medium flows in the cooling medium passage 8, it can take away the heat of the inner wall of the connecting rod 1. When the cooling medium flows through the cooling groove 11, it can take away the heat of the surface of the mold 3. However, part of the heat generated by the mold 3 will be transferred to the surface of the connecting rod 1. The heat at the overlap of the inner wall of the mold 3 and the outer wall of the connecting rod 1 is difficult to dissipate, which may affect the strength of the connecting rod 1. In order to promote the heat dissipation at the overlap of the inner wall of the mold 3 and the outer wall of the connecting rod 1, a plurality of heat pipes 13 are arranged inside the connecting rod 1 in the mold 3. The heat pipes 13 can be traditional heat pipes. Some machining tools currently use heat pipes for heat dissipation. One end of the traditional heat pipe is a heat absorbing end and the other end is a cooling end. A working medium is arranged inside. A capillary structure layer is arranged on the inner wall. The heat dissipation end absorbs heat to cause the working medium to gasify, and the cooling end releases heat to cause the working medium to liquefy. The capillary structure layer absorbs the liquid working medium at the cooling end to the heat absorbing end to realize the circulation of the working medium. This type of heat pipe requires a capillary structure layer, which has a relatively difficult process and high production cost, and has a slow reflow rate of the working fluid, thus affecting the heat dissipation efficiency.

[0049] In the present invention, one end of the heat pipe 13 is connected to the cooling medium inlet channel 8, and the other end is in contact with the inner wall of the mold 3; the heat pipe 13 is filled with a liquid medium at room temperature, and the inner cavity of the heat pipe 13 is negative pressure at room temperature.

[0050] The heat pipe 13 is made of a material with a high thermal conductivity, such as a copper pipe, and both ends of the copper pipe are sealed. The working fluid filled in the heat pipe 13 can be water. When the heat of the mold 3 is transferred to the outer wall of the connecting rod 1, the heat pipe 13 is located at one end of the outer wall of the connecting rod 1 to absorb heat, and the working fluid inside the heat absorbing end is vaporized and fills the inner cavity of the heat pipe 13. The end of the heat pipe 13 connected to the cooling medium access channel 8 is cooled by the cooling medium and has a low temperature, so that the gaseous working fluid inside the cooling end releases heat and liquefies, thereby realizing heat transfer. Since the connecting rod 1 rotates continuously at a high speed, the liquid working fluid obtained by liquefaction at the cooling end flows radially along the connecting rod 1 to the heat absorbing end under the action of centrifugal force, realizing the circulation of the working fluid and continuous heat dissipation.

[0051] In addition, in the present invention, the inner wall of the heat pipe 13 is a smooth wall, and there is no need to set a capillary structure layer, which greatly reduces the manufacturing difficulty and cost of the heat pipe 13. The centrifugal force when the connecting rod 1 rotates is used to promote the reflux of the working medium, and the reflux effect is good and the reflux speed is fast, which can increase the circulation speed of the working medium and ensure the heat dissipation effect.

[0052] The cooling medium discharge channel 12 can be arranged on the inner wall, outer wall or completely inside the support sleeve 4, as long as the cooling medium in the blind hole can be discharged. Since the support sleeve 4 and the connecting rod 1 are clearance-matched, the connecting rod 1 rotates at high speed during grinding, while the support sleeve 4 does not rotate. Therefore, it is necessary to avoid excessive friction between the connecting rod 1 and the support sleeve 4. The cooling medium carries grinding chips, some of which have a small particle size. These small particles of grinding chips may enter between the connecting rod 1 and the support sleeve 4, resulting in increased friction between the connecting rod 1 and the support sleeve 4, and aggravated wear of the connecting rod 1 and the support sleeve 4.

[0053] In order to prevent wear debris from entering between the connecting rod 1 and the support sleeve 4, a third sealing structure 127 is provided on the inner wall of one end of the support sleeve 4 facing the mold 3. The third sealing structure 127 plays a sealing role to prevent wear debris from entering between the connecting rod 1 and the support sleeve 4.

[0054] Conventional machining coolant usually has a lubricating effect. If the coolant can be passed into the gap between the connecting rod 1 and the support sleeve 4, the friction between the connecting rod 1 and the support sleeve 4 can be reduced, the service life of the connecting rod 1 and the support sleeve 4 can be extended, and the contact surface of the connecting rod 1 and the support sleeve 4 can be cooled at the same time.

[0055] In order to achieve the above functions, the cooling medium discharge channel 12 includes a first slot body 121, a second slot body 122 and a discharge port 123. The first slot body 121 is located on the outer wall of the support sleeve 4 facing the end of the mold 3. The first slot body 121 starts from the end face of the support sleeve 4 and extends axially for a distance. The bottom wall of the first slot body 121 is provided with a plurality of filter holes, which can play a filtering role. The coolant can pass through the filter holes, but the grinding chips cannot pass through the filter holes. The second slot body 122 is located on the inner wall of the support sleeve 4. The second slot body 122 can extend axially, or be spiral, or be partially an axially extending straight groove and partially spiral. There is a distance between the two ends of the second slot body 122 and the end of the support sleeve 4, that is, both ends of the second slot body 122 do not extend to the end face of the support sleeve 4. One end of the second trough 122 is connected to the filter hole, and the coolant filtered through the filter hole can enter the second trough 122. The other end of the second trough 122 is connected to the outlet 123, and the axial direction of the outlet 123 is consistent with the radial direction of the support sleeve 4; the outlet 123 is located at the end of the support sleeve 4 facing the connector 2. A first sealing structure 125 is provided on the outer wall of the support sleeve 4 between the outlet 123 and the first trough 121. During grinding, the first sealing structure 125 is always located in the blind hole. A second sealing structure 126 is provided on the inner wall of the end of the support sleeve 4 away from the grinding tool 3, and the second trough 122 is located between the second sealing structure 126 and the third sealing structure 127. The first sealing structure 125 can prevent the coolant from entering the matching gap between the support sleeve 4 and the wall of the blind hole, and the second sealing structure 126 can prevent the coolant between the connecting rod 1 and the support sleeve 4 from being discharged from the matching gap at the port. The first sealing structure 125, the second sealing structure 126 and the third sealing structure 127 can adopt the existing technology. A pressure reducing valve 124 is provided in the outlet 123, and the pressure reducing valve 124 can ensure that the coolant discharged from the outlet 123 is always at a constant pressure. The water pressure at the inlet 9 is higher than the outlet water pressure of the pressure reducing valve 124, which promotes the rapid circulation of the coolant.

[0056] The coolant in the blind hole carries the grinding chips and first enters the first trough 121. The coolant enters the second trough 122 through the filter hole at the bottom of the first trough 121, while the grinding chips stay in the first trough 121. The first trough 121 plays the role of storing grinding chips. After grinding, the support sleeve 4 can be taken out of the blind hole and then the grinding chips in the first trough 121 can be cleaned. The coolant enters the second trough 122. Since the second trough 122 is arranged on the inner wall of the support sleeve 4, the support sleeve 4 is connected to the matching clearance between the support sleeve 4 and the connecting rod 1. The drainage pressure can be controlled by the pressure reducing valve 124, so that the coolant in the second trough 122 has an appropriate high pressure. Under the action of high pressure, the coolant in the second trough 122 can fill the matching clearance between the support sleeve 4 and the connecting rod 1, play the role of lubrication and cooling, slow down the wear of the support sleeve 4 and the connecting rod 1, and take away the heat generated by friction.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deep blind hole grinding method, characterized in that: include S1, using a first grinding tool (130) to perform a grinding operation, wherein the grinding operation starts from the opening of the blind hole, and the grinding depth is 1 / 3 to 1 / 2 of the depth of the blind hole; S2. A second grinding tool is used to perform secondary grinding on the unground portion of the blind hole, wherein the second grinding tool comprises a connecting rod (1), one end of the connecting rod (1) is provided with a connecting head (2), the outer wall of the other end of the connecting rod (1) is provided with a grinding tool (3), and the outer wall of the connecting rod (1) between the connecting head (2) and the grinding tool (3) is provided with a supporting sleeve (4), one end of the supporting sleeve (4) is located outside the blind hole, and the other end extends into the blind hole.

2. The deep blind hole grinding method according to claim 1, characterized in that: One end of the support sleeve (4) located outside the blind hole is connected to a driving mechanism for driving the support sleeve (4) to move axially; during secondary grinding, the grinding tool (3) is fed toward the bottom of the blind hole, and the driving mechanism pushes the support sleeve (4) to move toward the inside of the blind hole.

3. A grinding device, comprising a work surface (100) and a spindle (110), wherein a positioning tool (120) is arranged on the work surface (100), characterized in that: The spindle (110) is connected to a detachable first grinding tool (130) or a second grinding tool, and the length of the first grinding tool (130) is shorter than the length of the second grinding tool; The second grinding tool comprises a connecting rod (1), one end of the connecting rod (1) is provided with a connecting head (2), the outer wall of the other end of the connecting rod (1) is provided with a grinding tool (3), the outer shell of the connecting rod (1) between the connecting head (2) and the grinding tool (3) is provided with a supporting sleeve (4), the supporting sleeve (4) and the connecting rod (1) are loosely matched, and the supporting sleeve (4) is connected to a positioning mechanism at one end facing the connecting head (2).

4. The grinding device according to claim 3, characterized in that: The positioning mechanism comprises a slide seat (5), the slide seat (5) is slidably matched with the work surface (100), and the slide seat (5) is connected to a driving mechanism; a positioning sleeve (6) is provided on the slide seat (5), and the support sleeve (4) is located in the positioning sleeve (6) and is fixedly connected to the positioning sleeve (6).

5. The grinding device according to claim 4, characterized in that: The driving mechanism is a hydraulic cylinder (7).

6. The grinding device according to claim 3, characterized in that: A cooling medium passage (8) is provided in the connecting rod (1); an inlet (9) is provided at one end of the connecting rod (1) located at the connecting head (2); the inlet (9) is connected to the cooling medium passage (8); an outlet (10) is provided on the end surface of one end of the connecting rod (1) located at the mold (3); the outlet (10) is connected to the cooling medium passage (8); a cooling groove (11) is provided on the outer wall of the mold (3) and axially penetrates the mold (3); and a cooling medium discharge passage (12) is provided on the support sleeve (4).

7. The grinding device according to claim 6, characterized in that: A plurality of heat-conducting pipes (13) are arranged inside the connecting rod (1) in the mold (3); one end of the heat-conducting pipe (13) is connected to the cooling medium inlet channel (8), and the other end is in contact with the inner wall of the mold (3); the heat-conducting pipe (13) is filled with a liquid working medium at room temperature, and the inner cavity of the heat-conducting pipe (13) is at negative pressure at room temperature.

8. The grinding device according to claim 6, characterized in that: A third sealing structure (127) is provided on the inner wall of one end of the support sleeve (4) facing the grinding tool (3).

9. The grinding device according to claim 8, characterized in that: The cooling medium discharge channel (12) comprises a first trough body (121), a second trough body (122) and a discharge port (123); the first trough body (121) is located on the outer wall of the support sleeve (4) at one end facing the mold (3); a plurality of filter holes are arranged on the bottom wall of the first trough body (121); the second trough body (122) is located on the inner wall of the support sleeve (4); one end of the second trough body (122) is connected to the filter holes, and the other end is connected to the discharge port (123); the discharge port (123) is connected to the outer wall of the support sleeve (4); 3) is located at one end of the support sleeve (4) facing the connecting head (2); a first sealing structure (125) is provided on the outer wall of the support sleeve (4) between the discharge port (123) and the first groove body (121), a second sealing structure (126) is provided on the inner wall of the end of the support sleeve (4) away from the mold (3), and the second groove body (122) is located between the second sealing structure (126) and the third sealing structure (127); a pressure reducing valve (124) is provided in the discharge port (123).

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