Structure for improving machining roundness and coaxiality of boring machine cylinder hole
By introducing a hydrostatic structure into the cylinder bore machining structure of a boring machine, and using hydrostatic oil film friction to replace dry wear, the problem of severe wear on the bottom sleeve and rotary sleeve was solved, achieving high-precision cylinder bore machining results.
Patent Information
- Application Number
- CN202520048613.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In traditional boring bar drive structures, the bottom sleeve and rotating sleeve suffer from severe wear, making it difficult to guarantee the roundness and coaxiality of the cylinder bore. Traditional repair methods are costly and inefficient.
The design adopts a dynamic and static pressure structure. The inner wall of the bottom sleeve is evenly distributed with static pressure oil chambers and oil return grooves, and the outer wall of the rotating sleeve is provided with O-ring grooves. The static pressure oil film is used to form full liquid friction, which reduces wear and improves the rotation roundness and coaxiality of the boring bar.
By using stable hydrostatic oil film friction, the coefficient of friction is reduced, improving the rotational accuracy of the boring bar and the roundness and coaxiality of the cylinder bore, reducing dry wear, extending tool life, and reducing surface roughness.
Smart Images
Figure CN223670256U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical processing technical field, concretely is a structure of improving boring machine cylinder hole processing roundness and coaxial degree. BACKGROUND
[0002] The boring bar transmission structure of the traditional large engine body cylinder hole boring machine is all the structure of the old fixed bottom sleeve and the rotating sleeve, the fixed bottom sleeve is fixed on each boring die frame of the boring machine bed, the rotating sleeve is installed in the middle of the fixed bottom sleeve, drives the boring bar to rotate, and the boring of the cylinder hole is carried out. In view of the limitation of lubrication, combined with the weight of the large boring bar itself, the wear between the bottom sleeve and the rotating sleeve is serious after the rotating sleeve is used for a period of time, the radial clearance between the two is increased, combined with the irregular wear, the roundness and coaxiality of the bored cylinder hole of the engine body are difficult to guarantee, and the traditional repair method is to re-produce the fixed bottom sleeve and the rotating sleeve, and re-adjust, which seriously restricts the production and has high cost. SUMMARY
[0003] The utility model aims at the technical defects of prior art, provides a structure of improving boring machine cylinder hole processing roundness and coaxial degree to solve the technical problem that the conventional matching structure of bottom sleeve and rotating sleeve is seriously worn in prior art.
[0004] To achieve the above technical purpose, the utility model adopts the following technical scheme:
[0005] A structure of improving boring machine cylinder hole processing roundness and coaxial degree, including bottom sleeve and rotating sleeve, wherein: the bottom sleeve includes a plurality of static pressure oil cavities and a plurality of oil return grooves, the static pressure oil cavity includes a deep cavity at the center position and a shallow cavity at the periphery of the deep cavity, a plurality of static pressure oil cavities and a plurality of oil return grooves are uniformly distributed on the inner wall of the bottom sleeve along the circumferential direction, the rotating sleeve is nested in the bottom sleeve, an O-ring groove is arranged on the outer wall of the rotating sleeve, and an O-ring is arranged in the O-ring groove, the O-ring is located at the edge position of the oil return groove and the static pressure oil cavity, and an oil inlet hole connected with the static pressure oil cavity is arranged on the bottom sleeve.
[0006] Preferably, the main shaft is installed on the rotating sleeve, and the bottom sleeve is installed on the boring die frame.
[0007] Preferably, the number of oil return grooves and the number of static pressure oil cavities are both four.
[0008] Preferably, the O-ring groove is provided with at least two rows.
[0009] The utility model provides a structure of improving boring machine cylinder hole processing roundness and coaxial degree. The technical scheme introduces the dynamic static pressure structure design between the fixed bottom sleeve and the rotary sleeve, utilizes the numerical control machine tool to carry out the interpolation milling processing in the inner hole four around of the fixed bronze bottom sleeve, increases four evenly distributed static pressure oil cavity and four oil return grooves on the inner wall of the fixed bottom sleeve, the oil return grooves and the static pressure oil cavity are spaced distribution, wherein each static pressure oil cavity includes deep cavity and shallow cavity, the oil return channel and the oil inlet channel are made on the side top surface of the fixed bottom sleeve corresponding to the oil return groove and the static pressure oil cavity, the external negative pressure main shaft oil enters the static pressure cavity through the oil inlet channel, and the oil in the static pressure cavity transmits the support force in the middle of the rotary sleeve and the fixed bottom sleeve. The outer diameter direction both sides of the rotary sleeve are processed the sealing groove, and the both ends embed the O type sealing ring, and the oil of the static pressure cavity is sealed between the fixed bottom sleeve and the rotary sleeve, so that after starting the external static pressure power hydraulic source, after a period of operation and the rotation of the boring bar, after the outer circle of the boring bar is detected by the micrometer, the pressure of the hydraulic pressure is adjusted, the dynamic balance of the boring bar operation can be reached, the static pressure pressure plays the role of supporting the weight of the boring bar and the rotary sleeve, because of the stability of the pressure, the roundness precision of the boring bar rotation is improved, the requirement of the boring hole processing roundness of the large machine body cylinder hole is met, and the coaxial degree between each cylinder hole is also ensured.
[0010] The utility model structure, because the stable static pressure oil pressure oil film between the fixed bottom sleeve and the rotary sleeve, the oil film contact, form full liquid friction, the friction coefficient only 0.001~0.008, prevent the occurrence of dry wear, the motion precision is high, the rotation error is generally below 0.2 μm, can improve the service life of the tool not only, can reach very high processing roundness and lower surface roughness. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structure diagram of the installation position of the utility model,
[0012] Figure 2 It is the installation structure diagram of the bottom sleeve, the rotary sleeve and the main shaft in the utility model,
[0013] Figure 3 It is the longitudinal section view of the bottom sleeve in the utility model,
[0014] Figure 4 It is the side view of the bottom sleeve in the utility model,
[0015] Figure 5 It is the longitudinal section view of the rotary sleeve in the utility model,
[0016] In the drawing,
[0017] CONCRETE EMBODIMENT
[0018] The specific embodiments of the present application will be described in detail below. In order to avoid too many unnecessary details, the structures or functions that are well known will not be described in detail in the following examples. The approximate language used in the following examples can be used for quantitative expression, indicating that the amount can be allowed to have certain changes without changing the basic functions. Unless defined, the technical and scientific terms used in the following examples have the same meaning as generally understood by those skilled in the art to which the present application belongs.
[0019] A structure for improving the roundness and coaxiality of a boring machine cylinder hole, as shown in Figures 1-5 , comprising a bottom sleeve 1 and a rotating sleeve 5, wherein: the bottom sleeve 1 comprises a plurality of static pressure oil chambers and a plurality of oil return grooves 4, the static pressure oil chamber comprises a deep cavity 3 located at the center position and a shallow cavity 2 located at the outer periphery of the deep cavity 3, a plurality of static pressure oil chambers and a plurality of oil return grooves 4 are uniformly distributed along the circumferential direction on the inner wall of the bottom sleeve 1, the rotating sleeve 5 is nested inside the bottom sleeve 1, and an O-ring groove 6 is provided on the outer wall of the rotating sleeve 5. An O-ring is placed in the O-ring groove 6, the O-ring is located at the edge position of the oil return groove 4 and the static pressure oil chamber, and an oil inlet hole 12 connected with the static pressure oil chamber is provided on the bottom sleeve 1. Wherein, the main shaft 7 is installed on the rotating sleeve 5, and the bottom sleeve 1 is installed on the boring die frame. The number of oil return grooves 4 and the number of static pressure oil chambers are both 4. The O-ring groove 6 is provided with at least two rows.
[0020] In terms of processing and installation, see Figure 3 , Figure 4 , after finishing the finish turning of the outer diameter and the inner diameter, the key step is to mill the static pressure cavity in the numerical control vertical boring and milling machine, and the fixed bottom sleeve is pressed on the workbench to ensure that the inner hole is not deformed, and then the interpolation milling of the inner hole of the fixed bottom sleeve is performed to mill the static pressure deep and shallow cavities to ensure that enough pressure oil can be stored and burrs can be removed. Figure 5 The sealing groove is cut out at the same time as the finish turning of the inner and outer holes. After the above-mentioned accessory is processed, it is assembled. In Figure 1 , the fixed bottom sleeve is installed in each boring die frame, and the bottom sleeve is fixed on the boring die frame by means of bolts and one-way gland. After the burrs of the inner hole of the bottom sleeve are ground, the inner cavity is coated with lubricating oil, the rotating sleeve with a seal is installed in the inner cavity of the bottom sleeve, the gland limiting the axial movement is added to the outer side of the rotating sleeve, attention should be paid to maintaining the axial balance of the rotating sleeve during installation, and after all the components are installed, the oil inlet and outlet of the fixed bottom sleeve are connected to the static pressure oil circuit, the static pressure oil circuit is started, a closed oil circuit is formed, the main shaft boring bar is inserted, the pressure is adjusted, and the dial indicator of the boring bar is stabilized within 0.01 millimeters in the circumferential direction, that is, the boring bar static pressure adjustment is completed.
[0021] The embodiments of the present application have been described in detail above, but the content described is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the scope of the application of the present application shall be included in the protection scope of the present application.
Claims
1. A structure for improving the roundness and coaxiality of a boring machine cylinder hole, comprising a bottom sleeve (1) and a rotary sleeve (5), characterized in that: The bottom sleeve (1) comprises several static pressure oil cavities and several oil return grooves (4), the static pressure oil cavities comprise a deep cavity (3) in the center position and a shallow cavity (2) in the periphery of the deep cavity (3), the several static pressure oil cavities and the several oil return grooves (4) are uniformly distributed along the circumferential direction on the inner wall of the bottom sleeve (1), the rotating sleeve (5) is nested in the inside of the bottom sleeve (1), the O-ring groove (6) is arranged on the outer wall of the rotating sleeve (5), the O-ring is arranged in the O-ring groove (6), the O-ring is located at the edge position of the oil return groove (4) and the static pressure oil cavity, and the oil inlet hole (12) connected with the static pressure oil cavity is arranged on the bottom sleeve (1).
2. The structure for improving the roundness and coaxiality of the boring hole of a boring machine according to claim 1, wherein The main shaft (7) is installed on the rotating sleeve (5), and the bottom sleeve (1) is installed on the boring die frame.
3. The structure for improving the roundness and coaxiality of the boring hole of a boring machine according to claim 1, wherein The number of the oil return grooves (4) and the number of the static pressure oil cavities are both four.
4. The structure for improving the roundness and coaxiality of the boring hole of a boring machine according to claim 1, wherein The O-ring groove (6) is provided with at least two rows.