A machining process for a bearing seat housing

Abstract

This invention discloses a machining process for a bearing housing, comprising the following steps: S1. Milling the first reference surface: The bearing housing is fixed on a machine tool using a first fixture, with the first reference surface facing upwards and a machining allowance of 0.5mm, a machining feed of ≥0.2mm / r, and a machining speed of ≥7000r / min; S2. Roughing and finishing the first reference hole and the stepped hole sequentially, with a machining allowance of 0.4mm on each side for the first reference hole and the stepped hole; S3. Reaming the second reference hole: The second reference hole is first rough-reamed, then chamfered at the upper end of the inner wall of the second reference hole, and then finished-reamed, wherein the machining allowance of the second reference hole is 0.4mm on each side; S4. Milling the bottom surface of the bearing housing; S5. Milling the circumferential contour surface and the second reference surface; S6. After milling the first countersunk surface, the bearing housing is removed from the first fixture; S7. After fixing the bearing housing with a second fixture, three process tables are milled; S8. Laser marking followed by cleaning and inspection. It can meet the positional accuracy requirements of the product, ensure stable product quality, and meet the needs of mass production.

Description

Technical Field

[0001] This invention belongs to the field of bearing housing processing, and specifically relates to a processing technology for bearing housings. Background Technology

[0002] Currently, the precision requirements for bearing housings are extremely stringent, with positional accuracy requirements between associated datums reaching φ0.02 and φ0.03, and contour accuracy requirements reaching 0.05. The compact shape of the bearing housings also leads to a lack of suitable clamping tables in the fixtures during machining. Furthermore, the numerous edge contours of the bearing housing products make them prone to burrs, resulting in inconsistent product quality.

[0003] Therefore, a new technology is needed to solve the problem of unstable quality of bearing housing products in existing technologies. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a processing technology for bearing housings that solves the problem of high positional accuracy requirements, meets the positional accuracy requirements of the product, ensures product quality stability, and can meet the needs of mass production.

[0005] The present invention adopts the following technical solution:

[0006] A processing method for a bearing housing includes a bearing housing with an upward-opening groove, a boss protruding from the bottom of the groove, a central hole of the boss serving as a first reference hole, a horizontally outward-protruding ring plate with an approximately quadrilateral outer periphery at the groove opening, the upper end face of the ring plate forming a first reference surface, the lower end face forming a second reference surface, three evenly spaced process platforms horizontally protruding from the outer periphery of the ring plate, each of the process platforms having a positioning hole; a third reference surface forming the bottom surface of the bearing housing, a vertically upward-opening blind hole on the ring plate serving as a second reference hole, and a vertically outer surface of the bearing housing with a circumferential contour surface and a teardrop-shaped horizontal cross-section, the tip of the teardrop-shaped structure having a first protrusion, the second reference hole being located on the first protrusion;

[0007] The processing technology of the bearing housing includes the following steps:

[0008] S1. Milling the first reference surface: The bearing housing is fixed on the machine tool using the first fixture, with the first reference surface facing upwards. The machining allowance of the first reference surface is 0.5mm, the machining feed is ≥0.2mm / r, and the machining speed is ≥7000r / min.

[0009] S2. Rough and fine drilling and reaming of the first reference hole and the stepped hole; first rough reaming of the first reference hole and the stepped hole, and then fine reaming of the first reference hole and the stepped hole. The stepped hole is located inside the first reference hole and is coaxial with the first reference hole. The machining allowance of the first reference hole and the stepped hole is 0.4mm on each side.

[0010] S3. Ream the second reference hole; First, rough ream the second reference hole, then chamfer the upper end of the inner wall of the second reference hole, and then fine ream the second reference hole. The machining allowance of the second reference hole is 0.4mm on one side.

[0011] S4. Mill the bottom surface of the bearing housing;

[0012] S5. Mill the peripheral contour surface and the second reference surface;

[0013] S6. Milling the first countersunk: The first countersunk is an R14 countersunk. After milling the first countersunk, remove the bearing housing from the first fixture.

[0014] S7. Milling three process tables: After fixing the bearing housing with the second fixture, mill three process tables;

[0015] S8. Laser marking: Laser marking is used on the side of the product;

[0016] S9. Cleaning and inspection.

[0017] As a further improvement to the technical solution of the present invention, the first clamp includes three floating supports that are spaced apart and have the same structure. Each floating support is provided with a fixed post, and each of the four corners of the ring plate is provided with a second through hole. Each fixed post is inserted into a second through hole and is detachably fixedly connected to the bearing housing.

[0018] As a further improvement to the technical solution of the present invention, each of the floating supports further includes a pressure block. One end of each pressure block is rotatably fixed on the operating table, and the other end is fixedly connected to a fixed column. One end of each fixed column is rotatably fixedly connected to a correspondingly provided machine tool. When the pressure block is flipped up or down, the fixed column is lifted up or inserted into the second through hole.

[0019] As a further improvement to the technical solution of the present invention, each of the floating supports further includes a mounting base, and the upper and lower ends of each mounting base are respectively connected to the corresponding pressure block and the operating table.

[0020] As a further improvement to the technical solution of the present invention, the first clamp also includes a first limiting block, the first limiting block having a first notch on the side near the bearing housing, the first notch matching and engaging with the outer side of the first protrusion.

[0021] As a further improvement to the technical solution of the present invention, the first fixture further includes a second limiting block. The three process tables are a first process table, a second process table, and a third process table. The first process table and the second process table are located on both sides of the first protrusion. The first process table and the second process table are each provided with a first through hole. Each first through hole forms the positioning hole. An L-shaped second notch is formed at the connection node between the third process table and the ring plate. The side of the second limiting block near the bearing housing matches and connects with the second notch.

[0022] As a further improvement to the technical solution of the present invention, the second clamp includes a base and four positioning posts mounted on the base. The upper end of each positioning post is in the shape of a stepped shaft and has a stepped surface. The upper end of each positioning post can be inserted into each of the second through holes and detachably fixedly connected to the ring plate. Each stepped surface abuts against the bottom surface of the ring plate.

[0023] As a further improvement to the technical solution of the present invention, the second clamp also includes a central support mounted on the base, the upper end of the central support being inserted into the groove and abutting against the bottom of the groove.

[0024] As a further improvement to the technical solution of the present invention, in step S9, an ultrasonic cleaning device is used for cleaning.

[0025] As a further improvement to the technical solution of the present invention, in step S9, manual inspection is carried out after cleaning to check for defects in the appearance of the product.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] During the processing, the processing sequence of this scheme is adopted. According to the machining of different parts, the bearing housing is fixedly supported by the first fixture and the second fixture respectively. When machining the first reference surface, the first reference hole and the second reference hole, the parts have good rigidity. Moreover, the bearing housing is not prone to vibration or displacement during the processing, which improves the machining accuracy of the bearing housing and meets the positional accuracy requirements of various structural parts on the bearing housing product. It solves the problem of high positional accuracy requirements and difficulty in machining, ensuring the stability of product quality and meeting the needs of mass production. Attached Figure Description

[0028] The technology of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 This is a schematic diagram of the connection structure between the first reference surface on the bearing housing and the first fixture when the first reference surface is facing downwards.

[0030] Figure 2 This is a schematic diagram of the first fixture;

[0031] Figure 3 This is a schematic diagram of the structure when the first reference surface on the bearing housing is facing upwards;

[0032] Figure 4 This is a schematic diagram of the structure when the first reference surface on the bearing housing faces downwards;

[0033] Figure 5 This is a schematic diagram of the connection structure between the first reference surface on the bearing housing and the second clamp when the first reference surface is facing downwards.

[0034] Figure label:

[0035] 1-Bearing housing; 11-Groove; 12-Boss; 121-First reference hole; 13-Annular plate; 131-Second through hole; 132-First reference surface; 133-Second reference surface; 134-Second reference hole; 14-First process platform; 141-First through hole; 15-Second process platform; 16-Third process platform; 17-Protrusion; 18-Second notch; 19-First countersunk platform; 110-Second countersunk platform;

[0036] 2-First clamp; 21-Floating support; 211-Mounting base; 212-Pressure block; 213-Fixing post; 22-First limiting block; 221-First notch; 23-Second limiting block;

[0037] 3-Second clamp; 31-Base; 32-Positioning pin;

[0038] 4-Machine tool; 41-Operating table. Detailed Implementation

[0039] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the accompanying drawings indicate the same or similar parts.

[0040] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "up," "down," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0041] Reference Figures 1 to 5A processing method for a bearing housing 1 is disclosed. The bearing housing 1 has an upward-opening groove 11. A boss 12 protrudes from the bottom of the groove 11. The center hole of the boss 12 is a first reference hole 121. An approximately quadrilateral ring plate 13 protrudes horizontally outward from the opening of the groove 11. The upper end face of the ring plate 13 forms a first reference surface 132, and the lower end face forms a second reference surface 133. Three evenly spaced process platforms protrude horizontally from the outer periphery of the ring plate 13. Two of the process platforms are provided with positioning holes. The bottom surface of the bearing housing 1 forms a third reference surface. An upward-opening blind hole is vertically provided on the ring plate 13. The blind hole is a second reference hole 134. The vertical outer surface of the bearing housing 1 is a circumferential contour surface with a teardrop-shaped horizontal cross-section. The tip of the teardrop-shaped structure is provided with a first protrusion 17. The second reference hole 134 is located on the first protrusion 17. The first reference surface 132 is located on one side of the back of the bearing housing 1.

[0042] The processing technology of the bearing housing 1 includes the following steps:

[0043] S1. Milling the first datum surface 132: The bearing housing 1 is fixed on the machine tool 4 using the first fixture 2, with the first datum surface 132 facing upwards. Machining is performed using a machining center, with diamond material selected for the cutting tool. The machining allowance for the first datum surface 132 is 0.5mm, the machining feed is ≥0.2mm / r, and the machining speed is ≥7000r / min, preferably 8000r / min. The first fixture 2 moves the floating support 21 of the bearing housing 1 by rotation. When machining the first datum surface 132, the first datum hole 121, and the second datum hole 134, the part has good rigidity, and the bearing housing 1 is not prone to vibration or displacement during the machining process. This improves the machining accuracy of the bearing housing 1, meets the positional accuracy requirements of various structural parts on the bearing housing 1, solves the problem of high positional accuracy requirements and difficult machining, ensures product quality stability, and meets the needs of mass production.

[0044] The first clamp 2 includes three identical floating supports 21 spaced apart. Each floating support 21 is provided with a fixed post 213. Each of the four corners of the ring plate 13 is provided with a second through hole 131. Each fixed post 213 is inserted into one of the second through holes 131 and detachably fixedly connected to the bearing housing 1. Each floating support 21 also includes a pressure block 212. One end of each pressure block 212 is rotatably fixed to the operating table, and the other end is fixedly connected to one of the fixed posts 213. One end of each fixed post 213 is rotatably fixedly connected to a corresponding machine tool 4. When the pressure block 212 flips upward or downward, the fixed post 213 is lifted upward or inserted downward into the second through hole 131. Each floating support 21 also includes a mounting base 211. The upper and lower ends of each mounting base 211 are respectively connected to the corresponding pressure block 212 and the operating table 41.

[0045] The first clamp 2 further includes a first limiting block 22 and a second limiting block 23. The first limiting block 22 has a first notch 221 on the side near the bearing housing 1, and the first notch 221 matches and abuts with the outer surface of the first protrusion 17. The three process tables are a first process table 14, a second process table 15, and a third process table 16. The first process table 14 and the second process table 15 are located on both sides of the first protrusion 17, and each of the first process table 14 and the second process table 15 has a first through hole 141, and each first through hole 141 forms the positioning hole. An L-shaped second notch 18 is formed at the connection node between the third process table 16 and the ring plate 13, and the side of the second limiting block 23 near the bearing housing 1 matches and abuts with the second notch 18.

[0046] S2. Rough and fine drilling and reaming of the first reference hole 121 and the stepped hole: Machining is performed using a machining center. First, rough reaming of the first reference hole 121 and the stepped hole is performed, which is equivalent to enlarging the first reference hole 121 and the stepped hole. A diamond tool is used for machining, with a feed rate ≥0.1mm / r and a machining speed ≥5000r / min, preferably 6000r / min, and a preferred feed rate of 0.1mm / r. Then, fine reaming of the first reference hole 121 and the stepped hole is performed. The stepped hole is located inside the first reference hole 121 and is coaxial with the first reference hole 121. The machining allowance of the first reference hole 121 and the stepped hole is 0.4mm on each side. A diamond tool is used for machining, with a feed rate ≥0.05mm / r and a machining speed ≥4000r / min, preferably 0.05mm / r, and a preferred machining speed of 5000r / min. Among them, the first reference hole 121 and the stepped hole have a diameter of φ14.9.

[0047] S3. Reaming the second reference hole 134: Machining is performed using a machining center. First, rough reaming of the second reference hole 134 is performed, which is equivalent to enlarging the second reference hole 134. A diamond tool is used, with a feed rate ≥0.1 mm / r and a machining speed ≥4000 r / min, preferably 5000 r / min, and a preferred feed rate of 0.1 mm / r. Then, a chamfer is applied to the upper end of the inner wall of the second reference hole 134. Afterwards, the second reference hole 134 is fine reamed, with a machining allowance of 0.4 mm on each side. A diamond tool is used, with a feed rate ≥0.1 mm / r and a machining speed ≥4000 r / min, preferably 5000 r / min, and a preferred feed rate of 0.1 mm / r.

[0048] S4. When milling the bottom surface of the bearing housing 1, a machining center is used for machining. A diamond tool is used for machining, with a machining feed ≥ 0.25 mm / r and a machining speed ≥ 7000 r / min. The preferred machining speed is 8000 r / min, and the preferred machining feed is 0.25 mm / r.

[0049] S5. When milling the peripheral contour surface and the second datum surface 133, machining is performed using a machining center with diamond cutting tools. The machining feed is ≥0.2mm / r, the machining speed is ≥7000r / min, preferably 8000r / min, and the preferred machining feed is 0.2mm / r. The peripheral contour surface and the second datum surface 133 are located on one side of the front of the bearing housing 1.

[0050] S6. Milling the first countersunk head 19: The first countersunk head 19 is machined using a machining center. The first countersunk head 19 is an R14 countersunk head. A diamond tool is used for milling the first countersunk head 19, with a feed rate ≥ 0.3 mm / r and a machining speed ≥ 7000 r / min, preferably 7500 r / min. After milling the first countersunk head 19, the burrs on the back of the bearing housing 1 are brushed off, and then the bearing housing 1 is removed from the first fixture 2. Specifically, a ceramic fiber tool is used for brushing the back burrs, with a feed rate ≥ 0.9 mm / r and a machining speed ≥ 2500 r / min, preferably 3000 r / min. The preferred machining speed is 0.9 mm / r.

[0051] S7. Milling three process tables: After fixing the bearing housing 1 with the second fixture 3, mill three process tables on the bearing housing 1 using a machining center. When milling the process tables, use carbide cutting tools, with a feed rate ≥0.15mm / r, a machining speed ≥4000r / min, preferably 5000r / min, and a preferred feed rate of 0.15mm / r. The second fixture 3 includes a base 31, four positioning posts 32 mounted on the base 31, and a central support. The upper end of each positioning post 32 is stepped and has a stepped surface. The upper end of each positioning post 32 can be inserted into each of the second through holes 131 and detachably fixedly connected to the ring plate 13. Each stepped surface abuts against the bottom surface of the ring plate 13. The upper end of the central support is inserted into the groove 11 and abuts against the bottom of the groove 11.

[0052] S8. Laser marking: Laser marking is applied to the side of the product to enable product traceability.

[0053] S9. Cleaning and Inspection: Ultrasonic cleaning equipment is used for cleaning. After cleaning, manual inspection is carried out to check for product appearance defects, such as dents, missing parts, residue, excessive porosity, and excessive burrs.

[0054] During the processing, the processing sequence of this scheme is adopted. According to the machining of different parts, the bearing housing 1 is fixedly supported by the first fixture 2 and the second fixture 3 respectively. When machining the first reference surface 132, the first reference hole 121, and the second reference hole 134, the parts have good rigidity. Moreover, the bearing housing 1 is not prone to vibration or displacement during the processing, which improves the machining accuracy of the bearing housing 1, meets the positional accuracy requirements of various structural parts on the bearing housing 1 product, solves the problem of high positional accuracy requirements and difficult machining, ensures the stability of product quality, and meets the needs of mass production.

[0055] Other aspects of the processing technology for the bearing housing described in this invention can be found in the prior art and will not be repeated here.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A processing technology for a bearing housing, characterized in that: The bearing housing has an upward-opening groove, and a boss protrudes from the bottom of the groove. The center hole of the boss is a first reference hole. A ring plate with an approximately quadrilateral outer periphery protrudes horizontally outward from the groove opening. The upper end face of the ring plate forms a first reference surface, and the lower end face forms a second reference surface. Three evenly spaced process platforms protrude horizontally from the outer periphery of the ring plate, and each of the process platforms has a positioning hole. The bottom surface of the bearing housing forms a third reference surface. A blind hole with an upward opening is vertically provided on the ring plate. The blind hole is a second reference hole. The vertical outer surface of the bearing housing is a circumferential contour surface with a teardrop-shaped horizontal cross-section. The tip of the teardrop-shaped structure has a first protrusion, and the second reference hole is located on the first protrusion. The processing technology of the bearing housing includes the following steps: S1. Milling the first reference surface: The bearing housing is fixed on the machine tool using a first fixture, with the first reference surface facing upwards. The machining allowance of the first reference surface is 0.5mm, the machining feed is ≥0.2mm / r, and the machining speed is ≥7000r / min. The first fixture includes three floating supports with the same structure and spaced apart. Each floating support is provided with a fixed post. The four corners of the ring plate are provided with second through holes. Each fixed post is inserted into a second through hole and is detachably fixed to the bearing housing. The first fixture also includes a second limiting block. The three process tables are a first process table, a second process table, and a third process table. The first process table and the second process table are located on both sides of the first protrusion. Each first process table and the second process table is provided with a first through hole. Each first through hole forms the positioning hole. An L-shaped second notch is formed at the connection node between the third process table and the ring plate. The side of the second limiting block near the bearing housing matches and connects with the second notch. S2. Rough and fine drilling and reaming of the first reference hole and the stepped hole; First, rough reaming of the first reference hole and the stepped hole is performed with a feed rate ≥0.1mm / r and a machining speed ≥5000r / min; then, fine reaming of the first reference hole and the stepped hole is performed, wherein the stepped hole is located inside the first reference hole and is coaxially set with the first reference hole, the machining allowance of the first reference hole and the stepped hole is 0.4mm on each side, the machining feed rate ≥0.05mm / r, and the machining speed ≥4000r / min; S3. Reaming the second reference hole: First, rough reaming the second reference hole with a feed rate ≥ 0.1 mm / r and a machining speed ≥ 4000 r / min; then, chamfering is performed on the upper end of the inner wall of the second reference hole, followed by finish reaming the second reference hole. The machining allowance of the second reference hole is 0.4 mm on each side, with a feed rate ≥ 0.1 mm / r and a machining speed ≥ 4000 r / min. S4. Mill the bottom surface of the bearing housing, with a feed rate ≥ 0.25 mm / r and a machining speed ≥ 7000 r / min; S5. Mill the peripheral contour surface and the second reference surface, with a machining feed ≥0.2mm / r and a machining speed ≥7000r / min; wherein, the peripheral contour surface and the second reference surface 133 are located on one side of the front of the bearing housing 1; S6. Milling the first countersink: The first countersink is an R14 countersink, with a machining feed ≥0.3mm / r and a machining speed ≥7000r / min. After milling the first countersink, remove the bearing housing from the first fixture. S7. Milling three process tables: After fixing the bearing housing with the second fixture, mill three process tables with a feed rate ≥0.15mm / r and a machining speed ≥4000r / min; the second fixture includes a base and four positioning pins mounted on the base. The upper end of each positioning pin is stepped and has a stepped surface. The upper end of each positioning pin can be inserted into each of the second through holes and detachably fixed to the ring plate. Each stepped surface abuts against the bottom surface of the ring plate; the second fixture also includes a central support mounted on the base. The upper end of the central support is inserted into the groove and abuts against the bottom of the groove; S8. Laser marking: Laser marking is used on the side of the product; S9. Cleaning and inspection.

2. The processing technology of the bearing housing according to claim 1, characterized in that: Each of the floating supports also includes a pressure block, one end of which is rotatably fixed to the operating table, and the other end is fixedly connected to a fixed column. One end of each fixed column is rotatably fixedly connected to a corresponding machine tool. When the pressure block flips up or down, the fixed column is lifted up or inserted into the second through hole.

3. The processing technology of the bearing housing according to claim 2, characterized in that: Each of the floating supports also includes a mounting base, and the upper and lower ends of each mounting base are respectively connected to the corresponding pressure block and the operating table.

4. The processing technology of the bearing housing according to claim 1, characterized in that: The first clamp also includes a first limiting block, which has a first notch on the side near the bearing housing, and the first notch matches and engages with the outer side of the first protrusion.

5. The processing technology of the bearing housing according to claim 1, characterized in that: In step S9, ultrasonic cleaning equipment is used for cleaning.

6. The processing technology of the bearing housing according to claim 1, characterized in that: In step S9, after cleaning, a manual inspection is carried out to check for defects in the product's appearance.

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