A method for machining a counterweight on a single-support thrust bearing
By using a reference keyway and oblique reference adjustment in the machining of the balance block on a single-support thrust bearing, the problems of low machining pass rate and low efficiency were solved, and high-precision and high-efficiency machining was achieved.
Patent Information
- Application Number
- CN202310009397.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-01-03
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2043-01-03
AI Technical Summary
In the existing technology, the machining qualification rate of the balance block on the single-support thrust bearing is low and the efficiency is low, making it difficult to ensure the symmetry of the tooth profiles on both sides and the machining time is long.
The workpiece is connected to the beveled fixture using a reference keyway. A symmetrical tooth profile is machined by adjusting the bevel reference. The dimensions of the bevel reference are calculated using trigonometric functions. Wire cutting is performed along a preset path. Combined with quenching and finishing, the accuracy of the tooth profile and pin hole is ensured.
It improves the machining pass rate and efficiency, ensures the symmetry of the tooth profiles on both sides, reduces the time wasted on repeated adjustments, and improves machining accuracy and efficiency.
Smart Images
Figure CN116000583B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a bearing part, belonging to the field of mechanical manufacturing, in particular to a single support type upper balance block processing method of a thrust bearing. BACKGROUND
[0002] The balance block is an important part of the thrust bearing, and a plurality of balance blocks are assembled to form a balance assembly. The balance assembly not only needs to transmit the axial thrust of the thrust bearing, but also needs to eliminate the unbalanced torque of the whole machine while bearing the thrust, so as to maintain the balance of the whole machine. The shapes of the balance blocks used in different models of thrust bearings may be different. The upper balance block of the single support type thrust bearing has a single tooth profile structure of inclined involute gears on both sides, which is obviously a special-shaped structure. The symmetry of the single tooth profile on both sides of the upper balance block, the relative symmetry of the two tooth profiles, and the symmetry of the depth of the two pin holes along the center of the tooth profile are required to be very strict.
[0003] In the processing of the upper balance block of the single support type thrust bearing, a block-shaped blank is usually provided, and the periphery of the blank is processed flat by a boring machine or a milling machine. The inclined angle surfaces of the tooth profiles on both sides are machined by milling. On a wire cutting machine, the distance between the upper and lower sides of the wire cutting machine is adjusted to correspond to the inclined angle to process the first tooth profile of the upper balance block. When processing the other tooth profile, the distance between the upper and lower sides of the wire cutting machine needs to be adjusted again. Although this processing method can process the balance machine, it still has the following defects:
[0004] It is difficult to ensure the consistency of the tooth profiles on both sides during processing. After processing, detection is often needed. If the symmetry of the tooth profiles on both sides is unqualified, the wire cutting machine needs to be adjusted accordingly, and the tooth profile needs to be processed and corrected again. Not only is the processing qualification rate low, but the processing time is also increased by repeated processing and correction, and the processing efficiency is also low.
[0005] The information disclosed in this background section is intended only to increase an understanding of the general context of the present application, and it should not be taken as an acknowledgement or any form of suggestion that this information forms prior art that is already widely known in the art before the filing date of the present application. SUMMARY
[0006] The purpose of the present application is to overcome the defects and problems of low processing qualification rate and low processing efficiency in the prior art, and to provide a single support type upper balance block processing method of a thrust bearing, which has a high processing qualification rate and a high processing efficiency.
[0007] To achieve the above object, the technical solution of the present application is: a single support type upper balance block processing method, the upper balance block comprises a first tooth profile and a second tooth profile arranged oppositely, a first pin hole and a second pin hole are respectively arranged on the adjacent surface between the first tooth profile and the second tooth profile, a pin hole and a lifting thread hole are arranged on the top surface of the upper balance block, and a reference key groove is arranged on the bottom surface; the processing method comprises the following steps:
[0008] Step one, a reference key groove is processed on the L2 surface of the precision blank, and the reference key groove is penetrated from the B1 surface to the B2 surface;
[0009] Step two, a first inclined reference and a second inclined reference are processed on the B1 surface of the precision blank to obtain a reference blank;
[0010] Step three, first, the reference blank is clamped on the inclined angle tooling, at this time, the connecting key of the inclined angle tooling is clamped in the reference key groove of the reference blank, then the inclination of the first inclined reference is adjusted, and the first tooth profile is processed along the preset path from the first inclined reference;
[0011] Step four, first, the reference blank is adjusted, then the inclination of the second inclined reference is adjusted, and the second tooth profile is processed along the preset path from the second inclined reference;
[0012] Step five, the first tooth profile and the second tooth profile are quenched until the surface hardness requirement is met to obtain a quenched blank;
[0013] Step six, a first pin hole is roughly processed on the B1 surface of the quenched blank, then a second pin hole is roughly processed on the B2 surface of the quenched blank, finally, a top surface pin hole and a lifting thread hole are roughly processed on the L1 surface of the quenched blank to obtain a rough hole blank;
[0014] Step seven, the rough hole blank is placed on two equal height blocks, at this time, the first tooth profile and the second tooth profile are respectively in contact with the two equal height blocks, and the shaft centers of the first pin hole and the second pin hole are on the same line and perpendicular to the horizontal plane;
[0015] Step eight, the first pin hole and the second pin hole are finished until the requirement is met to obtain a finished hole blank;
[0016] Step nine, the first pin hole bottom surface of the first pin hole and the second pin hole bottom surface of the second pin hole are processed in depth until the requirement is met, and the processing of the upper balance block is completed.
[0017] In step one, before processing the reference key groove, the step of pre-processing the precision blank is further included, and the steps are as follows: first, the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square blank are pre-processed until the processing requirement is met to obtain a rough work blank; then, the B1 surface and the B2 surface of the rough work blank are finished until the processing requirement is met to obtain a precision work blank.
[0018] The pre-machining refers to milling L1 surface, L2 surface, B1 surface and B2 surface of the square blank until the machining requirements are met; the machining requirements are: shape and position tolerance 0.03mm-0.05mm, surface quality Ra3.2-Ra6.3;
[0019] The finish machining refers to grinding or finish milling B1 surface and B2 surface of the rough work blank until the machining requirements are met; the machining requirements are: shape and position tolerance 0.01mm-0.02mm, surface quality Ra0.4-Ra0.8.
[0020] In the second step, the specific size of the first inclined reference and the second inclined reference is calculated according to trigonometric functions, wherein θ1, L, h and f are known values, and the calculation formula is as follows:
[0021] θ3=0.5*θ1, θ4=(180-θ1) / 2;
[0022] 0.5*L4=0.5*L-f÷cos(θ4);
[0023] 0.5*L3=0.5*L4-h*tan(θ3);
[0024] Wherein θ1 is the included angle between the first tooth profile and the second tooth profile; θ4 is the included angle between the first tooth profile or the second tooth profile and the bottom surface of the upper balance block; f is the distance between the first inclined reference and the second tooth profile or the distance between the second inclined reference and the first tooth profile; L is the width of the upper balance block, and h is the height of the upper balance block.
[0025] In the third step and the fourth step, the machining along the preset path refers to using molybdenum wire for wire cutting along the preset path, and the cutting speed is 2400mm2 / h.
[0026] In the third step and the fourth step, the adjusting the inclination of the first inclined reference and the second inclined reference refers to rotating the reference blank so that the first inclined reference or the second inclined reference is perpendicular to the horizontal plane.
[0027] In the fourth step, the adjusting the reference blank refers to taking down the reference blank, rotating 180 degrees around the axis of the center of L1 surface to the center of the reference key groove, and then clamping the reference blank on the connecting key.
[0028] In the sixth step, the rough machining refers to milling the first pin hole, the second pin hole, the top surface pin hole and the lifting thread hole with a machining allowance.
[0029] The step eight, the finish machining refers to: finish boring the first pin hole, the second pin hole, the top surface pin hole and the lifting thread hole and leaving a machining allowance, and the machining requirement is: the surface quality is Ra1.0-Ra1.6, the size tolerance is 6-7, and the shape and position tolerance is 0.02-0.03 mm.
[0030] The step nine, the depth machining refers to: after milling the first pin hole bottom surface, the distance J1 between the first pin hole bottom surface and the equal height surface of the equal height block is recorded, then the finish hole blank is turned over to mill the second pin hole bottom surface in the same way, and the distance J2 between the second pin hole bottom surface and the equal height surface of the equal height block is less than 0.01 mm from J1.
[0031] Compared with the prior art, the beneficial effects of the present application are:
[0032] 1. In the single support type thrust bearing upper balance block machining method, the following steps are included: one, a reference key groove is processed on the L2 surface of the finish blank; two, a first inclined reference and a second inclined reference are processed on the B1 surface of the finish blank to obtain a reference blank; three, the reference blank is first clamped on the inclined angle tooling, the inclination of the first inclined reference is adjusted, and the first tooth profile is processed along the preset path from the first inclined reference; four, the reference blank is first adjusted, then the inclination of the second inclined reference is adjusted, and the second tooth profile is processed along the preset path from the second inclined reference; five, the first tooth profile and the second tooth profile are quenched to obtain a quenched blank; six, the first pin hole and the second pin hole are respectively roughly processed on the B1 surface and the B2 surface of the quenched blank, and finally the top surface pin hole and the lifting thread hole are roughly processed on the L1 surface of the quenched blank to obtain a rough hole blank; seven, the rough hole blank is placed on two equal height blocks; eight, the first pin hole and the second pin hole are finish machined to obtain a finish hole blank; nine, the first pin hole bottom surface of the first pin hole and the second pin hole bottom surface of the second pin hole are depth machined until the requirements are met, and the machining of the upper balance block is completed; in the application, the reference key groove of the part itself is used as a connecting piece to connect the part and the inclined angle tooling, the position of the tooth profile is confirmed to process the inclined reference, the tooth profile is machined from the inclined reference, then the part is rotated to machine the tooth profile on the other side, in this process, only the direction of the workpiece is changed, the inclined angle tooling, the connecting piece and the machining path are not changed, the two tooth profiles machined are symmetrical, and the low machining qualification rate and time waste caused by repeated adjustment of the symmetry of the two tooth profiles are avoided. Therefore, the present application has high machining qualification rate and high machining efficiency.
[0033] 2. In the single support type thrust bearing upper balance block machining method, the specific size of the first inclined reference and the second inclined reference is calculated according to a trigonometric function, and then the first inclined reference and the second inclined reference are machined, the inclined reference is the side of the first tooth profile or the second tooth profile, after the inclined reference is obtained, the inclination angle of the inclined reference is adjusted to be consistent with the machining tool, and is perpendicular to the horizontal plane, one side tooth profile is machined according to the shape of the required tooth profile, then the reference blank is removed to change the side, the other side tooth profile is machined, the machining path is unchanged, the two side tooth profiles are symmetrical, and the angle of the two side tooth profiles does not need to be repeatedly adjusted and confirmed, and the machining efficiency is improved. Therefore, the machining precision is high, and the machining efficiency is high.
[0034] 3. In the single support type thrust bearing upper balance block machining method, after the first pin hole bottom surface is milled, the distance J1 between the first pin hole bottom surface and the equal height surface of the equal height block is recorded, then the fine hole blank is turned over to mill the second pin hole bottom surface in the same way; the distance J2 between the second pin hole bottom surface and the equal height surface of the equal height block is less than 0.01mm different from J1; in the application, the distance between the b1 surface and the first pin hole bottom surface needs to be consistent with the distance between the b2 surface and the second pin hole bottom surface, and the center line of the b1 surface to the b2 surface is not adopted to confirm the machining depth in the machining process, so that the error is large, and the above-mentioned method can reduce the machining error. Therefore, the machining qualification rate of the present application is high. BRIEF DESCRIPTION OF DRAWINGS
[0035] Figure 1 It is the structure diagram of the upper balance block in the application.
[0036] Figure 2 It is the structure diagram of the rough machining blank in the application.
[0037] Figure 3 It is the side view of the rough machining blank in the application.
[0038] Figure 4 It is the structure diagram of the reference key groove in the application.
[0039] Figure 5 It is the bottom view of the reference key groove in the application.
[0040] Figure 6 It is the structure diagram of the first inclined reference and the second inclined reference in the application.
[0041] Figure 7 It is the relative position diagram of the first inclined reference and the inclined angle tooling in the application.
[0042] Figure 8 It is the bottom view of the first tooth profile in the application.
[0043] Figure 9 is the relative position diagram of the second inclined reference and the inclined angle tool in the present application.
[0044] Figure 10 is the bottom view of the second tooth profile in the present application.
[0045] Figure 11 is the relative position diagram of the first inclined angle and the second inclined angle in the present application.
[0046] Figure 12 is the top view of the quenched blank in the present application.
[0047] Figure 13 is the structural diagram of the first pin hole in the present application.
[0048] Figure 14 is the bottom view of the first pin hole and the second pin hole in the present application.
[0049] Figure 15 is the relative position diagram of the top pin hole and the lifting thread hole in the present application.
[0050] Figure 16 is the relative position diagram of the rough hole blank and the equal height block in the present application.
[0051] Figure 17 is the relative position diagram of the bottom surface of the first pin hole and the bottom surface of the second pin hole in the present application.
[0052] Figure 18 is the included angle diagram of the first inclined reference and the second inclined reference in the present application.
[0053] In the figure: rough work blank 1, fine work blank 2, reference blank 3, inclined angle tool 4, connecting key 41, quenched blank 5, rough hole blank 6, equal height block 61, fine hole blank 7, upper balancing block 8, reference keyway 11, first inclined reference 12, second inclined reference 13, first inclined angle 14, second inclined angle 15, first tooth profile 101, second tooth profile 102, first pin hole 51, bottom surface of the first pin hole 511, second pin hole 52, bottom surface of the second pin hole 521, pin hole 53, lifting thread hole 54. DETAILED DESCRIPTION
[0054] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0055] Reference Figure 1 — Figure 17A machining method of a single support type upper balance block of a thrust bearing, the upper balance block 8 comprising a first profile 101 and a second profile 102 arranged oppositely, a first pin hole 51 and a second pin hole 52 are respectively arranged on the adjacent surface between the first profile 101 and the second profile 102, a pin hole 53 and a lifting threaded hole 54 are arranged on the top surface of the upper balance block 8, and a reference key groove 11 is arranged on the bottom surface; the machining method comprises the following steps:
[0056] Step one, a reference key groove 11 is machined on the L2 surface of the precision blank 2, and the reference key groove 11 is penetrated from the B1 surface to the B2 surface;
[0057] Step two, a first inclined reference 12 and a second inclined reference 13 are machined on the B1 surface of the precision blank 2 to obtain a reference blank 3;
[0058] Step three, first, the reference blank 3 is clamped on the bevel tooling 4, at this time, the connecting key 41 of the bevel tooling 4 is clamped in the reference key groove 11 of the reference blank 3, then the inclination of the first inclined reference 12 is adjusted, and the first profile 101 is machined along the preset path from the first inclined reference 12;
[0059] Step four, first, the reference blank 3 is adjusted, then the inclination of the second inclined reference 13 is adjusted, and the second profile 102 is machined along the preset path from the second inclined reference 13;
[0060] Step five, the first profile 101 and the second profile 102 are quenched until the surface hardness requirement is met to obtain a quenched blank 5;
[0061] Step six, the first pin hole 51 is rough machined on the B1 surface of the quenched blank 5, then the second pin hole 52 is rough machined on the B2 surface of the quenched blank 5, finally, the top surface pin hole 53 and the lifting threaded hole 54 are rough machined on the L1 surface of the quenched blank 5 to obtain a rough hole blank 6;
[0062] Step seven, the rough hole blank 6 is placed on two equal height blocks 61, at this time, the first profile 101 and the second profile 102 are respectively in contact with the two equal height blocks 61, and the axes of the first pin hole 51 and the second pin hole 52 are on the same line and perpendicular to the horizontal plane;
[0063] Step eight, the first pin hole 51 and the second pin hole 52 are finished until the requirement is met to obtain a finished hole blank 7;
[0064] Step nine, the first pin hole bottom surface 511 of the first pin hole 51 and the second pin hole bottom surface 521 of the second pin hole 52 are processed in depth until the requirement is met, and the machining of the upper balance block 8 is completed.
[0065] The step one, before processing the reference key groove 11, further comprises a step of pre-processing the precision work blank 2, which is as follows: firstly, pre-processing the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square blank until the processing requirements are met, to obtain a rough work blank 1; and then, finishing the B1 surface and the B2 surface of the rough work blank 1 until the processing requirements are met, to obtain the precision work blank 2.
[0066] The pre-processing refers to milling the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square blank until the processing requirements are met; the processing requirements are as follows: shape and position tolerance 0.03mm-0.05mm, surface quality Ra3.2-Ra6.3;
[0067] The finishing refers to grinding or fine milling the B1 surface and the B2 surface of the rough work blank 1 until the processing requirements are met; the processing requirements are as follows: shape and position tolerance 0.01mm-0.02mm, surface quality Ra0.4-Ra0.8.
[0068] In the step two, the specific sizes of the first inclined reference 12 and the second inclined reference 13 are calculated according to trigonometric functions, wherein θ1, L, h and f are known values, and the calculation formula is as follows:
[0069] θ3=0.5*θ1, θ4=(180-θ1) / 2;
[0070] 0.5*L4=0.5*L-f÷cos(θ4);
[0071] 0.5*L3=0.5*L4-h*tan(θ3);
[0072] Wherein θ1 is the included angle between the first tooth profile 101 and the second tooth profile 102; θ4 is the included angle between the first tooth profile 101 or the second tooth profile 102 and the bottom surface of the upper balance block 8; f is the distance between the first inclined reference 12 and the second tooth profile 102 or the distance between the second inclined reference 13 and the first tooth profile 101; L is the width of the upper balance block 8, and h is the height of the upper balance block 8.
[0073] In the step three and the step four, the processing along the preset path refers to using a molybdenum wire for wire cutting along the preset path, and the cutting speed is 2400mm2 / h.
[0074] In the step three and the step four, the adjusting the inclination of the first inclined reference 12 and the second inclined reference 13 refers to rotating the reference blank 3 so that the first inclined reference 12 or the second inclined reference 13 is perpendicular to the horizontal plane.
[0075] In the fourth step, the adjusting base blank 3 is removed, and the base blank 3 is clamped on the connecting key 41 with the shaft of the center of the L1 face to the center of the reference key groove 11 as the axis and rotated by 180 degrees.
[0076] In the sixth step, the rough machining refers to milling the first pin hole 51, the second pin hole 52, the top surface pin hole 53 and the lifting thread hole 54 with a machining allowance.
[0077] In the eighth step, the finish machining refers to finish boring the first pin hole 51, the second pin hole 52, the top surface pin hole 53 and the lifting thread hole 54 with a machining allowance, and the machining requirement is that the surface quality is Ra1.0-Ra1.6, the size tolerance is 6-7 levels, and the shape and position tolerance is 0.02-0.03 mm.
[0078] In the ninth step, the deep machining refers to milling the first pin hole bottom surface 511, recording the distance J1 between the first pin hole bottom surface 511 and the equal height surface of the equal height block 61, and then turning over the finish hole blank 7 to mill the second pin hole bottom surface 521 in the same way; the distance J2 between the second pin hole bottom surface 521 and the equal height surface of the equal height block 61 is less than 0.01 mm from the distance J1.
[0079] The principle of the application is as follows:
[0080] The upper balance block 8 in the application has a special-shaped structure, and the two sides have inclined first tooth profile 101 and second tooth profile 102, the bottom has a reference key groove 11, the front and rear end faces have a first pin hole 51 and a second pin hole 52, and the top surface has a top surface pin hole 53 and a lifting thread hole 54. According to the functional requirements, the distance between the tooth profile division line of the first tooth profile 101 and the second tooth profile 102 and the tooth profile top surface requires high accuracy, the tooth profile surface of the same tooth profile and the center symmetry of the first pin hole bottom surface 511 and the second pin hole bottom surface 521 require high accuracy, and the size and the symmetry of the tooth profile division line along the left-right direction center line of the left and right sides require high accuracy.
[0081] Embodiment 1:
[0082] Referring to Figure 1 — Figure 17 A single support type thrust bearing upper balance block machining method, the upper balance block 8 includes a first tooth profile 101 and a second tooth profile 102 arranged opposite to each other, a first pin hole 51 and a second pin hole 52 are respectively arranged on the adjacent surface between the first tooth profile 101 and the second tooth profile 102, a pin hole 53 and a lifting thread hole 54 are arranged on the top surface of the upper balance block 8, and a reference key groove 11 is arranged on the bottom surface; the machining method comprises the following steps:
[0083] Step one, machining a reference key groove 11 on the L2 surface of the precision blank 2, the reference key groove 11 is through from the B1 surface to the B2 surface; (preferably, the two side surfaces of the reference key groove 11 are parallel to the H1 surface and the H2 surface of the precision blank 2)
[0084] Step two, machining a first inclined reference 12 and a second inclined reference 13 on the B1 surface of the precision blank 2 to obtain a reference blank 3;
[0085] Step three, first, clamping the reference blank 3 on the bevel tool 4, at this time, the connecting key 41 of the bevel tool 4 is clamped in the reference key groove 11 of the reference blank 3, then adjusting the inclination of the first inclined reference 12, and machining the first tooth profile 101 along the preset path from the first inclined reference 12;
[0086] Step four, first, adjusting the reference blank 3, then adjusting the inclination of the second inclined reference 13, and machining the second tooth profile 102 along the preset path from the second inclined reference 13 (preferably, according to the tooth profile shape, the corresponding machining path program is prepared for machining, the machining method is molybdenum wire cutting, and the cutting speed is 2400mm2 / h);
[0087] Step five, quenching the first tooth profile 101 and the second tooth profile 102 (preferably, laser quenching), until the surface hardness requirement is met, to obtain a quenched blank 5;
[0088] Step six, rough machining the first pin hole 51 on the B1 surface of the quenched blank 5, then rough machining the second pin hole 52 on the B2 surface of the quenched blank 5, and finally rough machining the top surface pin hole 53 and the lifting thread hole 54 on the L1 surface of the quenched blank 5 to obtain a rough hole blank 6;
[0089] Step seven, placing the rough hole blank 6 on two equal height blocks 61, at this time, the first tooth profile 101 and the second tooth profile 102 are in contact with the two equal height blocks 61 respectively, and the axes of the first pin hole 51 and the second pin hole 52 are on the same line and perpendicular to the horizontal plane;
[0090] Step eight, finishing the first pin hole 51 and the second pin hole 52 until the requirements are met to obtain a fine hole blank 7;
[0091] Step nine, deep processing the first pin hole bottom surface 511 of the first pin hole 51 and the second pin hole bottom surface 521 of the second pin hole 52 until the requirements are met, and the processing of the upper balance block 8 is completed.
[0092] Example 2:
[0093] The basic content is the same as that of example 1, the difference is that:
[0094] See Figure 11, the step five, before quenching the first tooth profile 101 and the second tooth profile 102, further comprises the step of machining the first bevel angle 14 and the second bevel angle 15, which steps are as follows: the first bevel angle 14 is located at the bottom surface of the first tooth profile 101, and extends from the outer bevel surface of the first tooth profile 101 to the first bevel reference 12; the second bevel angle 15 is located at the bottom surface of the second tooth profile 102, and extends from the outer bevel surface of the second tooth profile 102 to the second bevel reference 13; after machining the first tooth profile 101 and the second tooth profile 102, the first bevel angle 14 and the second bevel angle 15 are milled off.
[0095] Embodiment 3:
[0096] The basic content is the same as that of embodiment 2, except that:
[0097] In the step one, before machining the reference key groove 11, further comprising the step of pre-machining the precision workpiece 2, which steps are as follows: first, pre-machining the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square workpiece until the machining requirements are met, to obtain the rough workpiece 1; then, finish machining the B1 surface and the B2 surface of the rough workpiece 1 until the machining requirements are met, to obtain the precision workpiece 2;
[0098] The pre-machining refers to milling the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square workpiece until the machining requirements are met; the machining requirements are: shape and position tolerance 0.03mm-0.05mm, surface quality Ra3.2-Ra6.3; the finish machining refers to grinding or finish milling the B1 surface and the B2 surface of the rough workpiece (1) until the machining requirements are met; the machining requirements are: shape and position tolerance 0.01mm-0.02mm, surface quality Ra0.4-Ra0.8, parallelism ≤0.02mm.
[0099] Embodiment 4:
[0100] The basic content is the same as that of embodiment 3, except that:
[0101] In the step two, the specific sizes of the first bevel reference 12 and the second bevel reference 13 are calculated according to trigonometric functions, wherein: θ1, L, h, f are known values, and the calculation formula is as follows:
[0102] θ3=0.5*θ1, θ4=(180-θ1) / 2;
[0103] 0.5*L4=0.5*L-f÷cos(θ4);
[0104] 0.5*L3=0.5*L4-h*tan(θ3);
[0105] Wherein: θ1 is the included angle between the first tooth profile 101 and the second tooth profile 102; θ4 is the included angle between the first tooth profile 101 or the second tooth profile 102 and the bottom surface of the upper balance block 8; f is the distance between the first inclined reference 12 and the second tooth profile 102 or the distance between the second inclined reference 13 and the first tooth profile 101; L is the width of the upper balance block 8, and h is the height of the upper balance block 8.
[0106] In the steps three and four, the adjustment of the inclination of the first inclined reference 12 and the second inclined reference 13 refers to rotating the reference blank 3 so that the first inclined reference 12 or the second inclined reference 13 is perpendicular to the horizontal plane, and the inclination is 0.5*θ1.
[0107] Example 5:
[0108] The basic content is the same as that of example 4, except that:
[0109] In the step six, the rough machining refers to milling the first pin hole 51, the second pin hole 52, the top surface pin hole 53 and the lifting thread hole 54 and leaving a 1mm-1.5mm machining allowance; in the step eight, the finish machining refers to finish boring the first pin hole 51, the second pin hole 52, the top surface pin hole 53 and the lifting thread hole 54 and leaving a 0.5mm-0.8mm machining allowance; and the machining requirement is that the surface quality is Ra1.0-Ra1.6, the dimensional tolerance is 6-7, and the geometric tolerance is 0.02mm-0.03mm.
[0110] Example 6:
[0111] The basic content is the same as that of example 5, except that:
[0112] Referring to Figure 17 , the step nine is to perform deep machining on the first pin hole bottom surface of the first pin hole and the second pin hole bottom surface of the second pin hole until the requirement is met, and the machining of the upper balance block is completed.
[0113] In application, the machining depth is not confirmed by the center line of the b1 surface to the b2 surface. In theory, the distance K1 from the first pin hole bottom surface 511 to the center line is equal to the distance K2 from the second pin hole bottom surface 521 to the center line, and then the distance J1 between the first pin hole bottom surface 511 and the climbing surface of the equal height block 61 is equal to the distance J2 between the second pin hole bottom surface 521 and the climbing surface of the equal height block 61. In order to avoid machining errors, after milling the first pin hole bottom surface 511, the distance J1 between the first pin hole bottom surface 511 and the equal height surface of the equal height block 61 is recorded, and then the second pin hole bottom surface 521 is milled in the same way by turning over the finish machining blank 7; the distance J2 between the second pin hole bottom surface 521 and the equal height surface of the equal height block 61 is less than 0.01mm different from J1.
[0114] The above merely describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above embodiments, but any equivalent modifications or changes made by those skilled in the art according to the disclosed content of the present application shall be included in the protection scope recorded in the claims.
Claims
1. A machining method of a single support type upper balance block, the upper balance block (8) comprising oppositely arranged first and second tooth profiles (101, 102), first and second pin holes (51, 52) being respectively formed on adjacent surfaces between the first and second tooth profiles (101, 102), a pin hole (53) and a lifting threaded hole (54) being formed on a top surface of the upper balance block (8), and a reference key groove (11) being formed on a bottom surface of the upper balance block (8); characterized in that, The processing method comprises the following steps: Step one, machining a reference keyway (11) on the L2 surface of the precision blank (2), the reference keyway (11) is through from the B1 surface to the B2 surface; Step two, machining a first inclined reference (12) and a second inclined reference (13) on the B1 surface of the precision blank (2), obtaining a reference blank (3); Step three, first, clamping the reference blank (3) on the bevel tooling (4), at this time, the connecting key (41) of the bevel tooling (4) is clamped in the reference keyway (11) of the reference blank (3), then adjusting the inclination of the first inclined reference (12), and machining the first tooth profile (101) along the preset path from the first inclined reference (12); Step four, first, adjusting the reference blank (3), then adjusting the inclination of the second inclined reference (13), and machining the second tooth profile (102) along the preset path from the second inclined reference (13); Step five, quenching the first tooth profile (101) and the second tooth profile (102) until the surface hardness requirement is met, obtaining a quenched blank (5); Step six, rough machining a first pin hole (51) on the B1 surface of the quenched blank (5), then rough machining a second pin hole (52) on the B2 surface of the quenched blank (5), finally rough machining a top surface pin hole (53) and a lifting thread hole (54) on the L1 surface of the quenched blank (5), obtaining a rough hole blank (6); Step seven, placing the rough hole blank (6) on two equal height blocks (61), at this time, the first tooth profile (101) and the second tooth profile (102) are in contact with the two equal height blocks (61) respectively, and the axes of the first pin hole (51) and the second pin hole (52) are on the same line and perpendicular to the horizontal plane; Step eight, finishing the first pin hole (51) and the second pin hole (52) until the requirement is met, obtaining a finished hole blank (7); Step nine, depth processing the first pin hole bottom surface (511) of the first pin hole (51) and the second pin hole bottom surface (521) of the second pin hole (52) until the requirement is met, completing the processing of the upper balance block (8).
2. The single support type thrust bearing upper balance block processing method according to claim 1, characterized in that: Before machining the reference keyway (11) in the step one, the step further comprises a pre-processing step of the precision blank (2), the steps are as follows: first, pre-processing the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square blank until the processing requirement is met, obtaining a rough processing blank (1); then, finishing the B1 surface and the B2 surface of the rough processing blank (1) until the processing requirement is met, obtaining the precision blank (2).
3. The single support type thrust bearing upper balance block processing method according to claim 2, characterized in that: The pre-processing refers to milling the L1 surface, the L2 surface, the B1 surface and the B2 surface of the square blank until the processing requirement is met; the processing requirement is that the form and position tolerances are 0.03mm-0.05mm, and the surface quality is Ra3.2-Ra6.
3. The finishing refers to grinding or fine milling of the B1 surface and the B2 surface of the rough work blank (1) until the processing requirements are met; the processing requirements are: shape and position tolerance 0.01mm-0.02mm, surface quality Ra0.4-Ra0.
8.
4. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the second step, the specific sizes of the first inclined reference (12) and the second inclined reference (13) are calculated according to trigonometric functions, wherein θ1, L, h, and f are known values, and the calculation formula is as follows: θ3 = 0.5 * θ1, θ4 = (180-θ1) / 2; 0.5*L4 = 0.5*L-f ÷ cos(θ4); 0.5*L3 = 0.5*L4-h*tan(θ3); Wherein: θ1 is the included angle between the first tooth profile (101) and the second tooth profile (102); θ4 is the included angle between the first tooth profile (101) or the second tooth profile (102) and the bottom surface of the upper balance block (8); f is the distance between the first inclined reference (12) and the second tooth profile (102) or the distance between the second inclined reference (13) and the first tooth profile (101); L is the width of the upper balance block (8), and h is the height of the upper balance block (8).
5. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the third step and the fourth step, the machining along the preset path refers to using molybdenum wire for wire cutting along the preset path, and the cutting speed is 2400mm2 / h.
6. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the third step and the fourth step, the adjustment of the inclination of the first inclined reference (12) and the second inclined reference (13) refers to rotating the reference blank (3) so that the first inclined reference (12) or the second inclined reference (13) is perpendicular to the horizontal plane.
7. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the fourth step, the adjustment of the reference blank (3) refers to taking down the reference blank (3), taking the shaft with the center of the L1 surface to the center of the reference key groove (11) as the axis, rotating 180 degrees, and then clamping the reference blank (3) on the connecting key (41).
8. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the sixth step, the rough machining refers to milling the first pin hole (51), the second pin hole (52), the top surface pin hole (53), and the lifting thread hole (54) and leaving a processing allowance.
9. The machining method of the upper balance block of the single-support type thrust bearing according to claim 1, characterized in that: In the eighth step, the finishing refers to fine boring of the first pin hole (51), the second pin hole (52), the top surface pin hole (53), and the lifting thread hole (54) and leaving a processing allowance; the processing requirements are: surface quality Ra1.0-Ra1.6, size tolerance 6-7, shape and position tolerance 0.02mm-0.03mm.
10. The method of claim 1, wherein: in step nine, the deep processing means that after milling the first pin hole bottom surface (511), the distance J1 between the first pin hole bottom surface (511) and the equal height surface of the equal height block (61) is recorded, then the precision hole blank (7) is turned over to mill the second pin hole bottom surface (521) in the same way; the distance J2 between the second pin hole bottom surface (521) and the equal height surface of the equal height block (61) is less than 0.01 mm different from J1.
Citation Information
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