A processing device and method for double thrust sliding bearing in the finishing stage

Abstract

A processing device and method for a double thrust sliding bearing in the finishing stage, the device comprises two sets of pressure plate assemblies, the bearing alloy end face F is placed on the positioning working surface of the base so that they are reliably fitted, after the bearing is aligned, the first set of pressure plate assemblies is used to press the bearing alloy end face E through the inner hole to perform finishing of the outer circle, the second set of pressure plate assemblies is used to press the side of the outer circle ring groove from the outside of the bearing to perform finishing of the inner hole and the alloy end face E, the bearing is turned over, and the positioning cylindrical pin and the second set of pressure plate assemblies are used to position and press, and the alloy end face F is finished; the clamping force layout of the invention is reasonable, and the bearing is automatically centered when it is turned over without alignment, which solves the problem that the shape and position tolerance caused by the clamping of the bearing outer circle by the previous processing equipment is difficult to meet the design requirements and the quality problem that the alloy end face that has been processed is easy to be scratched, thereby ensuring the shape and position accuracy and product quality of the double thrust sliding bearing.

Description

Technical Field

[0001] The invention relates to the technical field of sliding bearing processing, and in particular to a processing device and method for a double-thrust sliding bearing in a finishing stage. Background Art

[0002] Double thrust sliding bearings are made of bimetallic materials (carbon steel and tin-based alloy). The inner hole material and both end surface materials are made of tin-based alloy. The bearing has a two-half split structure and is installed in the seat hole of the gear box body to support the gear shaft to transmit power. When the gear shaft is running, it can not only withstand the radial force, but also the bidirectional axial force.

[0003] Under normal operation, the double thrust sliding bearing injects lubricating oil of a certain pressure into the annular gap formed between the journal and the bearing aperture and between the shaft shoulder end face and the double thrust alloy end face to establish a lubricating oil film that "isolates the two". When the journal and the bearing aperture and the shaft shoulder end face and the double thrust alloy end face are in a stable liquid lubrication state, their friction coefficient and wear are minimal, thereby ensuring the transmission efficiency of the gear shaft. For gearboxes with high transmission efficiency requirements, there will be high precision requirements when designing sliding bearings, and as the bearing design precision increases, the difficulty of bearing manufacturing technology will increase.

[0004] Since the double thrust sliding bearing is a two-half split structure, and the design accuracy (including the cylindricality and coaxiality of the outer circle and the inner hole, and the perpendicularity of the double thrust alloy end face and the outer circle) is relatively high, therefore, in the fine processing stage, on the one hand, the structure of the double thrust sliding bearing makes it difficult to adopt a radial force clamping method (usually, the two-half split bearing is prone to deformation under the action of radial force, and it is difficult to control the bearing shape and position accuracy during the processing, resulting in poor bearing quality or instability). On the other hand, from the bearing structure, it can be seen that the double thrust alloy end face cannot be completed in one clamping, but requires two clampings to complete. Especially when the alloy end face that has been processed is used for positioning, it is difficult to control the problem of scratching the alloy end face that has been processed in place during the clamping and alignment process. Considering the influence of factors such as clamping, processing parameters and material properties, the principle of first processing the outer circle, then processing the inner hole and finally processing the end face should be followed. How to control the shape and position accuracy and surface quality of the bearing is the technical key to processing. Therefore, it becomes inevitable to design special tooling to complete the processing of inner and outer circles and end faces. Summary of the invention

[0005] In order to overcome the above-mentioned existing technical defects, the purpose of the present invention is to provide a processing device and method for a double thrust sliding bearing in the fine machining stage, which has the characteristics of strong structural integrity, good rigidity, reasonable force, reliable positioning and can eliminate the quality problem of easy scratching of the alloy end face, thereby solving the difficult machining problem existing in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A processing device for the finishing stage of a double thrust sliding bearing, comprising a base 1 and two sets of pressing plate assemblies mounted on the base 1;

[0008] The first set of pressing plate assemblies is evenly distributed on the bottom surface K of the knife groove of the base 1 in the circumferential direction, and includes a pressing plate 2, a locking screw 4 is connected to the pressing plate 2 through a locking nut 5, and a support rod 3 is arranged inside the pressing plate 2;

[0009] The second set of pressing plate assemblies is evenly distributed on the positioning working surface W of the base 1 in the circumferential direction, and includes a B pressing plate 6, a B locking screw 8 is connected to the B pressing plate 6 through a B locking nut 9, and a B supporting rod 7 is arranged on the outer side of the B pressing plate 2;

[0010] A positioning cylindrical pin 10 for forming a three-point positioning of an inscribed circle is also provided on the positioning working surface W of the base 1 .

[0011] A support hole N, a locking screw hole Q and a positioning pin hole S are provided on the positioning working surface W of the base 1;

[0012] A knife groove bottom surface K is arranged on the inner circle of the base 1 , and a support hole M, a locking screw hole P and a drain hole H are arranged on the knife groove bottom surface K.

[0013] The processing method based on the processing device of the double thrust sliding bearing finishing stage comprises the following steps:

[0014] First, place the bearing alloy end face F to be processed on the positioning working surface W of the base to make it fit reliably, use a table to align the outer circle of the bearing, use the first set of pressing plates to pass through the inner hole to press the bearing alloy end face E, and place a soft gasket between the first set of pressing plates and the bearing alloy end face E, and then you can carry out fine processing of the bearing outer circle;

[0015] 2. After the outer circle machining is completed, do not remove the first set of pressure plate assembly. Use the second set of pressure plate assembly to press the outer ring groove side from the outside of the bearing, and use the alignment table to check the outer circle of the bearing to see if there are any changes.

[0016] 3. If there is no change in the alignment table, remove the first set of pressure plate assembly, then remove the alignment table, and finally perform fine machining of the bearing inner hole and the bearing alloy end face E;

[0017] Fourth, use a micrometer to complete the "self-check" of the coaxiality of the inner hole of the bearing relative to the outer circle on the lathe, then remove the second set of pressure plate assembly, remove the bearing, and then complete the installation of the three positioning cylindrical pins 10 on the base 1;

[0018] 5. Turn the bearing over, and vertically turn the positioning outer circle of one end of the bearing alloy end face E along the inscribed circle formed by the three positioning cylindrical pins 10. Be careful not to rotate it. After vertically turning it over, place the bearing alloy end face E on the positioning working surface W of the base 1, and then use the second set of pressure plate combination to press the side of the outer ring groove of the bearing, and then you can carry out the fine processing of the bearing alloy end face F.

[0019] The beneficial effects of the present invention are: using the working surface W on the base as the positioning reference of the bearing end face, and using two sets of pressure plate assemblies and the automatic centering cylindrical pin 10 for limit locking. After aligning the outer circle of the bearing, the outer circle, inner hole and alloy end face E of the bearing are finished by fastening the first set of pressure plate assemblies and the second set of pressure plate assemblies in different positions successively. When the bearing is turned over, the fine processing of the bearing alloy end face F is completed by positioning and fastening the positioning cylindrical pin 10 and the second set of pressure plate assemblies, so that the shape and position accuracy and surface quality of the double thrust sliding bearing are effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the processing device structure of the present invention, wherein: Figure 1 (a) Main view, Figure 1 (b) is a top view.

[0021] Figure 2 is a structural diagram of the base 1 of the present invention, wherein: Figure 2 (a) Figure 2 (b) AA cross-sectional view.

[0022] Figure 3 It is a processing diagram of the base positioning working surface in the fine processing state of the present invention.

[0023] Figure 4 It is the outer circle processing diagram of the present invention in the finishing state.

[0024] Figure 5 It is a transfer diagram of the pressing plate of the present invention in the finishing state.

[0025] Figure 6 This is a processing diagram E of the inner hole and alloy end surface in the fine processing state of the present invention.

[0026] Figure 7 is a processing diagram of the alloy end face F in the finish processing state of the present invention, wherein: Figure 7 (a) Main view, Figure 7 (b) is a top view. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1As shown, a processing device for the finishing stage of a double thrust sliding bearing comprises a base 1 and two sets of pressing plate assemblies mounted on the base 1;

[0029] The first set of pressing plates is composed of four plates, which are evenly distributed on the bottom surface K of the cutter groove of the base 1 in the circumferential direction, and play an axial pressing role during the outer circle machining of the bearing; the pressing plate 2 includes a locking screw 4 connected to the pressing plate 2 through a locking nut 5, and a support rod 3 is arranged inside the pressing plate 2;

[0030] The second set of pressure plates is composed of four plates, which are evenly distributed circumferentially on the positioning working surface W of the base 1, and play an axial clamping role during the processing of the inner hole of the bearing and the alloy end face, including a B pressure plate 6, and a B locking screw 8 is connected to the B pressure plate 6 through a B locking nut 9, and a B support rod 7 is arranged on the outside of the B pressure plate 2.

[0031] Three positioning cylindrical pins 10 are also arranged on the positioning working surface W of the base 1 to form three-point positioning of the inscribed circle; they play the role of automatic centering of the bearing when turning over, can be positioned without alignment, and can prevent quality problems such as scratches on the alloy end faces that have been processed.

[0032] like Figure 2 , Figure 3 As shown, a positioning working surface W is provided on the outer ring of the base 1. Before each processing, an appropriate amount of cutting can be performed to provide a reliable end face positioning reference. A support hole N, a locking screw hole Q and a positioning pin hole S are provided on the working surface W; the support hole N prevents the B support rod 7 from tipping over or slipping, and plays a safety protection role when the B support rod 7 is used; the locking screw hole Q is used to fix the B locking screw 9; the positioning pin hole S is used to install the positioning cylindrical pin 10 and plays an automatic centering role.

[0033] The inner circle of the base 1 is provided with a tool groove bottom surface K, which can not only play the role of tool overtravel when machining the inner hole, but also play the role of storing alloy chips; the tool groove bottom surface K is provided with a support hole M, a locking screw hole P and a discharge hole H; the support hole M prevents the support rod 3 from tipping over or slipping, and plays a role of safety protection when the support rod 3 is used; the locking screw hole P is used to fix the locking screw 4; the discharge hole H plays the role of discharging the chip liquid after cooling.

[0034] The positioning working surface W on the base 1 must be cut appropriately before each processing to provide a reliable end face positioning reference and to ensure that the verticality of the two alloy end faces and the outer circle of the bearing meets the requirements; the two sets of "pressure plates" are used reasonably, combined with the monitoring of the alignment table. During the process of completing the inner and outer circle processing, the principle of keeping the needle of the alignment table still is adopted to ensure that the cylindricality requirements of the inner and outer circles are achieved; when the bearing is turned over, the inscribed circle formed by the three positioning cylindrical pins (the same size as the bearing positioning outer circle) plays an automatic centering role, eliminating the alignment link and ensuring that the end face alloy will not have scratches or quality problems.

[0035] The processing device described in the present invention is processed on a CNC vertical lathe; in the first step, considering the characteristics of the two halves of the bearing structure, the bearing alloy end face F should be pre-processed to ensure that the end face meets the processing requirements, that is, the coplanarity should be good and the positioning should be reliable. In the second step, all other parts on the base 1 are removed, the outer circle of the base 1 is clamped with the lathe chuck jaws, and the outer circle is aligned with the table. Then, the positioning working surface W on the base 1 is processed with the lathe, and the chamfers of the mounting holes on the base 1 are repaired. Figure 2 and Figure 3 .

[0036] The processing method based on the processing device of the double thrust sliding bearing finishing stage comprises the following steps:

[0037] 1. Reference Figure 4 , place the bearing alloy end face F to be processed on the base positioning working surface W to make it fit reliably, use a gauge to align the outer circle of the bearing, use the first set of pressure plates to pass through the inner hole to press the bearing alloy end face E, pay attention to protecting the alloy surface, and place a soft gasket between the first set of pressure plates and the bearing alloy end face E, such as copper sheets of appropriate thickness, which can also play a role in adjusting the height of the fulcrums at both ends of the pressure plate, and then the fine processing of the bearing outer circle can be carried out, see Figure 5 .

[0038] 2. After the outer circle processing is completed, be careful not to remove the first set of pressure plate combination. This is particularly important. It is the key to ensure that the bearing does not shift. First, use the second set of pressure plate combination to press the side of the outer ring groove from the outside of the bearing. You can place gaskets on the sides of the pressure plate and the ring groove, such as copper sheets or silicon steel sheets of appropriate thickness, which can adjust the height of the fulcrums at both ends of the pressure plate. Use the alignment table to check the outer circle of the bearing and observe whether there are any changes in the alignment table. Figure 5 .

[0039] 3. If there is no change in the alignment table, remove the first set of pressure plate combination first, and then remove the alignment table. Here we need to remind you that the pressure plate should be removed first and then the alignment table, that is, the alignment table should be used to continue monitoring during the removal of the pressure plate until it is confirmed that the bearing position has not changed, and then the alignment table can be removed. The purpose is to prevent the bearing from shifting when the pressure plate is removed. Finally, the inner hole of the bearing and the end face E of the bearing alloy are finished. See Figure 6 .

[0040] 4. Use a micrometer to complete the "self-check" of the coaxiality of the inner hole of the bearing relative to the outer circle on the lathe, then remove the second set of pressure plate assembly and remove the bearing, and then complete the installation of the three positioning cylindrical pins 10 on the base 1, see Figure 7 .

[0041] 5. Turn the bearing over, and turn the positioning outer circle of one end of the bearing alloy end face E vertically along the inscribed circle formed by the three positioning cylindrical pins 10. Be careful not to rotate it. After turning it vertically, place the bearing alloy end face E on the positioning working surface W of the base 1, and then use the second set of pressure plate combination to press the side of the outer ring groove of the bearing, and then the bearing alloy end face F can be finely processed. See Figure 7 .

[0042] The present invention places the bearing alloy end face F on the positioning working surface of the base 1 so that they fit reliably. After aligning the bearing, the first set of pressure plate combination is used to press the bearing alloy end face E through the inner hole to perform fine processing of the outer circle. The second set of pressure plate combination is used to press the side of the outer ring groove from the outside of the bearing to perform fine processing of the inner hole and the alloy end face E. The bearing is turned over, and the positioning cylindrical pin 10 and the second set of pressure plate combination are used to position and press, and the alloy end face F is fine processed. The clamping force layout of the present invention is reasonable, and the bearing is automatically centered when it is turned over without alignment, which solves the problem that the shape and position tolerance caused by the clamping of the outer circle of the bearing by the previous processing equipment is difficult to meet the design requirements and the quality problem that the alloy end face that has been processed is easy to be scratched. In this way, the shape and position accuracy and product quality of the double thrust sliding bearing are guaranteed.

Claims

1. A processing method of a processing device in the finishing stage of a double thrust sliding bearing, characterized in that: The processing device comprises a base (1) and two sets of pressing plate assemblies mounted on the base (1); The first set of pressing plate assemblies is evenly distributed on the bottom surface K of the knife groove of the base (1) in the circumferential direction, and comprises a pressing plate (2), a locking screw (4) is connected to the pressing plate (2) via a locking nut (5), and a support rod (3) is arranged on the inner side of the pressing plate (2); The second set of pressure plate assemblies is evenly distributed on the positioning working surface W of the base (1) in the circumferential direction, and comprises a B pressure plate (6), the B pressure plate (6) is connected to a B locking screw (8) via a B locking nut (9), and a B support rod (7) is arranged outside the B pressure plate (6); A positioning cylindrical pin (10) for forming a three-point positioning of an inscribed circle is also provided on the positioning working surface W of the base (1); A support hole N, a locking screw hole Q and a positioning pin hole S are arranged on the positioning working surface W of the base (1); a knife groove bottom surface K is arranged on the inner circle of the base (1), and a support hole M, a locking screw hole P and a drain hole H are arranged on the knife groove bottom surface K; Processing methods The following steps are involved: First, place the bearing alloy end face F to be processed on the positioning working surface W of the base to make it fit reliably, use a table to align the outer circle of the bearing, use the first set of pressing plates to pass through the inner hole to press the bearing alloy end face E, and place a soft gasket between the first set of pressing plates and the bearing alloy end face E, and then you can carry out fine processing of the bearing outer circle; 2. After the outer circle machining is completed, do not remove the first set of pressure plate assembly. Use the second set of pressure plate assembly to press the outer ring groove side from the outside of the bearing, and use the alignment table to check the outer circle of the bearing to see if there are any changes.

3. If there is no change in the alignment table, remove the first set of pressure plate assembly, then remove the alignment table, and finally perform fine machining of the bearing inner hole and the bearing alloy end face E; 4. Use a micrometer to complete the "self-check" of the coaxiality of the inner hole of the bearing relative to the outer circle on the lathe, then remove the second set of pressure plate assembly and remove the bearing, and then complete the installation of the three positioning cylindrical pins (10) on the base (1); 5. Turn the bearing over, and vertically turn the positioning outer circle of one end of the bearing alloy end face E along the inscribed circle formed by the three positioning cylindrical pins (10). Be careful not to rotate it. After vertically turning it over, place the bearing alloy end face E on the positioning working surface W of the base (1), and then use the second set of pressure plate assembly to press the side of the outer ring groove of the bearing, and then the bearing alloy end face F can be finely processed.

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