An engine cylinder block precision assembly machining device

Abstract

The application relates to the technical field of engine cylinder block assembly turning processing equipment, and particularly discloses an engine cylinder block precision assembly processing device; the device comprises a processing base, two inner support assemblies for jointly supporting and clamping cylinder liners are arranged on the processing base and horizontally slide relative to each other, a turning mechanism is symmetrically and horizontally slidably driven and installed on the processing base and located between the two inner support assemblies, and the device adopts a multiple center alignment structure of internal support and external clamping, can continuously turn the outer wall and two ends of the cylinder liner, improves the turning stability, improves the turning precision, and guarantees the turning quality of the cylinder liner and the subsequent use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine cylinder block assembly turning processing equipment, and particularly discloses an engine cylinder block precision assembly processing device. BACKGROUND

[0002] The engine cylinder block is a main structural component of the engine, usually made of cast iron or aluminum alloy, and the design and manufacture of the engine cylinder block directly affect the performance, reliability and service life of the engine; the cylinder liner is a key component for ensuring the performance and reliability of the engine cylinder block, which is a metal liner installed in the engine cylinder block, used to protect the engine cylinder block from wear and tear and provide a smooth inner wall to ensure the normal operation of the piston and piston ring, thereby improving the durability and sealing performance of the engine cylinder block; the cylinder liner is generally manufactured by casting, and the cast cylinder liner needs to be rough machined and finished machined; since the outer wall of the cylinder liner is tightly fitted with the engine cylinder block, the sealing performance and heat conduction performance must be ensured, and therefore the precision of the outer wall of the cylinder liner is very high, and turning is the most important process in the machining of the outer wall of the cylinder liner.

[0003] In the precision turning of the outer wall of the cylinder liner of the engine cylinder block, the inner wall of the cylinder liner is generally clamped and fixed by inner support to avoid the outer wall of the cylinder liner and perform rotary turning; in the existing machining, two large inner support chucks are generally used for inner support fixation, but in actual machining, the following problems exist:

[0004] 1) The existing inner support chuck usually has multiple inner support clamping jaws, and the inner support clamping jaws are in hard clamping contact with the inner wall of the cylinder liner; the cylinder liner is a cast part, and the inner wall of the cylinder liner inevitably has uneven quality defects of the cast part, and the flatness of the inner wall of the cylinder liner varies, with great randomness and contingency; therefore, when the inner support clamping is performed by the existing inner support chuck, the inner support clamping center and the actual center of the cylinder liner will deviate greatly randomly, thereby causing uneven wall thickness of the cylinder liner after turning, which will greatly affect the actual working quality of the engine cylinder block.

[0005] 2) The cylinder liner is usually a large cylindrical structure, i.e., has a large radial dimension and axial dimension; during actual turning, only the two-end inner support clamping and rotary turning mode is used, and the turning stability is poor, which also affects the turning machining precision. SUMMARY

[0006] In order to solve the above problems, the present application provides an engine cylinder block precision assembly processing device to solve the problems mentioned in the background.

[0007] In order to achieve the above object, the present application adopts the following technical scheme to realize it: A kind of engine cylinder block precision assembly processing device, including processing base, two inner support assemblies for being used to jointly inner support clamping cylinder sleeve are arranged on the processing base and are horizontally slidably arranged;The turning mechanism is driven and installed on the processing base and slides horizontally with the inner support assembly, and the turning mechanism is located between the two inner support assemblies.

[0008] The inner support assembly includes a rotary support that is driven and installed on the processing base and slides horizontally, a rotary disc that is driven and installed on the rotary support and rotates horizontally, an inner support frame that is fixedly installed on the rotary disc, a plurality of inner support modules that are distributed axially along the rotary disc and are assembled on the inner support frame, and an inner support drive mechanism that is assembled on the inner support frame and synchronously drives the plurality of inner support modules to clamp the cylinder sleeve, wherein the inner support module includes at least three inner support blocks that are distributed circumferentially around the central axis of the rotary disc, and the distance from the at least three inner support blocks in the same inner support module to the central axis of the rotary disc is always equal when the inner support module clamps the cylinder sleeve.

[0009] The turning mechanism includes a sliding base that is driven and installed on the processing base and slides horizontally, a tool holder that is assembled on the sliding base and is used to fix a turning tool, and the tool holder is arranged in a radial direction of the rotary disc and is driven to advance, two sets of outer clamping components that are assembled on the sliding base and are used to clamp the outer wall of the cylinder sleeve adaptively, the two sets of outer clamping components are distributed axially along the rotary disc, the tool holder is located between the two sets of outer clamping components, the number of outer clamping components in each set is two, and the two outer clamping components in each set are distributed symmetrically on both sides of the central axis of the rotary disc in a direction that is perpendicular to the axial direction of the rotary disc.

[0010] Preferably, an end clamping disc is assembled on the inner support frame and is used to clamp the end of the cylinder sleeve by elastic force, and at least one top contact block is fixed on the sliding base, when the turning mechanism moves towards one side of the inner support assembly, the top contact block contacts the end clamping disc on the side that is close to the end clamping disc, so that the end clamping disc is separated from the end of the cylinder sleeve.

[0011] Preferably, the inner support blocks are assembled on the inner support frame and slide in the radial direction of the rotary disc, the inner support module further includes a plurality of double-headed telescopic rods that are alternately distributed with the at least three inner support blocks, are connected in series and are hinged to form a closed loop, and a self-adaptive assembly that is fixedly assembled at the center between both ends of the double-headed telescopic rod and is used to stretch and contract in the radial direction of the rotary disc, the inner support drive mechanism includes a plurality of drive plates that are correspondingly arranged with the plurality of double-headed telescopic rods in the same inner support module, the drive plates are driven and installed on the inner support frame and slide in the radial direction of the rotary disc, and the plurality of self-adaptive assemblies that are distributed in the axial direction of the rotary disc in the plurality of inner support modules are fixed on the corresponding drive plates.

[0012] Preferably, when the end chuck clamps the end of the cylinder sleeve, the inner support block in the inner support module closest to the end chuck is completely located in the cylinder sleeve.

[0013] Preferably, the inner support driving mechanism further comprises a driving shaft coaxially arranged with the rotary disc and horizontally rotatably installed on the inner support frame; the driving plate is vertically provided with two sliding plates at opposite axial ends of the rotary disc, and the two sliding plates are slidingly fitted on the inner support frame; the driving shaft is fixed with two hinge joints corresponding to the two sliding plates; and the hinge joints are hingedly connected with the plurality of sliding plates on the same side of the driving plate.

[0014] Preferably, the double-headed telescopic rod comprises a middle pipe and two sliding rods oppositely slidingly installed at both ends of the middle pipe, and the two sliding rods are hingedly connected to the two inner support blocks; and the self-adaptive assembly is connected to the middle pipe.

[0015] Preferably, the sliding base is provided with two side support plates horizontally and symmetrically distributed on both sides of the central shaft of the rotary disc, and the two outer clamping components on the same side of the central shaft of the rotary disc are installed on the same side of the side support plate; the outer clamping component comprises a carryover sliding block horizontally and slidingly installed on the side support frame, a plurality of sliding shafts slidingly arranged in the same direction on the carryover sliding block, a roller frame commonly fixed at the ends of the plurality of sliding shafts, an outer clamping spring sleeved on the sliding shaft, and the outer clamping spring is fixed at the ends of the carryover sliding block and the roller frame; and two sets of outer clamping guide rollers are horizontally rotatably installed on the roller frame, and the two sets of outer clamping guide rollers are distributed on the upper and lower sides of the central shaft of the rotary disc.

[0016] Preferably, the top contact block is provided with a cylindrical shaft axially parallel to the rotary disc, and the two ends of the cylindrical shaft are movably embedded with ball bearings.

[0017] Preferably, the inner support frame comprises a plurality of guide columns horizontally fixed on the rotary disc; the end chuck is slidingly installed on the plurality of guide columns; the guide columns are sleeved with end chuck springs, and the ends of the end chuck springs are fixed on the rotary disc and the end chuck.

[0018] Preferably, the inner support frame further comprises two bearing end plates, one of which is fixed at the end of the plurality of guide columns; a plurality of first connecting plates corresponding to the plurality of inner support blocks in the inner support module are horizontally fixed between the two bearing end plates, and the inner support blocks are slidingly installed on the corresponding first connecting plates; a plurality of second connecting plates corresponding to the plurality of driving plates are horizontally fixed between the two bearing end plates, and the two sliding plates provided on the driving plate are slidingly installed on the corresponding second connecting plates; and the driving shaft is horizontally rotatably installed on the two bearing end plates.

[0019] The technical scheme has the following advantages or beneficial effects: the engine cylinder body precision assembly machining device provided by the application is provided with two inner support assemblies, and the inner support assemblies are provided with a plurality of independent inner support modules capable of synchronously driving and clamping the inner wall of the cylinder liner, thereby forming a plurality of inner support clamping contact points distributed in the circumference and having a common clamping center, which improves the problem that the clamping center deviates due to the unevenness of the inner wall of the cylinder liner in the existing inner support chuck structure, and makes the wall thickness of the cylinder liner after turning uneven, improves the reliability and stability of the inner support clamping, and greatly reduces the deviation error between the inner support clamping center and the center of the cylinder liner itself; in addition, two groups of outer clamping components that move synchronously with the turning process and provide outer wall clamping for the cylinder liner are cooperatively arranged, a multiple center alignment structure of internal support and external clamping is adopted, the turning stability is improved, and the concentricity of turning is further improved; in summary, the device provided by the application can continuously turn the outer wall and both ends of the cylinder liner, improves the turning precision on the basis of improving the turning stability, and ensures the turning quality of the cylinder liner and the subsequent use effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application and its features, shapes and advantages will become more apparent from the following detailed description of non-limiting embodiments, with reference to the accompanying drawings. The same reference numbers in all the drawings indicate the same parts, and the drawings are not necessarily drawn to scale, with the emphasis being on illustrating the principles of the application.

[0021] Figure 1 is a perspective structural schematic view of an engine cylinder body precision assembly machining device provided by the application.

[0022] Figure 2 is a machining state perspective view of an engine cylinder body precision assembly machining device provided by the application.

[0023] Figure 3 is a machining state top view of an engine cylinder body precision assembly machining device provided by the application.

[0024] Figure 4 is Figure 3 is a sectional view of A-A in FIG.

[0025] Figure 5 is Figure 4 is a local enlarged view of B in FIG.

[0026] Figure 6 is a perspective structural view of an inner support assembly.

[0027] Figure 7 is a top view of an inner support assembly.

[0028] Figure 8 is Figure 7 is a sectional view of C-C in FIG.

[0029] Figure 9 is the assembly relationship of the inner support module and the inner support frame.

[0030] Figure 10 is the assembly relationship of the inner support driving mechanism and the inner support frame.

[0031] Figure 11 is the three-dimensional structure of the turning mechanism.

[0032] In the figure: 1, processing base; 11, guide rail; 12, moving guide frame; 121, horizontal guide rod; 2, inner support assembly; 21, rotary support; 22, rotary disc; 23, inner support frame; 231, guide column; 232, bearing end plate; 233, No. 1 connecting plate; 234, No. 2 connecting plate; 24, inner support module; 241, inner support block; 242, double-headed telescopic rod; 2421, middle tube; 2422, sliding rod; 243, self-adaptive assembly; 2431, sliding block; 2432, sliding sleeve block; 2433, self-adaptive spring; 25, inner support driving mechanism; 251, driving motor; 252, driving shaft; 2521, articulated joint; 253, connecting rod; 254, driving plate; 2541, sliding plate; 26, end chuck; 261, end chuck spring; 3, turning mechanism; 31, sliding base; 311, side support plate; 32, turning tool fixing table; 33, top touch block; 331, cylindrical shaft; 332, ball; 34, outer clamping component; 341, carryover sliding block; 342, sliding shaft; 343, roller holder; 344, outer clamping spring; 345, outer clamping guide roller; 4, cylinder sleeve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0035] As shown in Figure 1 , Figure 2 and Figure 3 , a turning processing device for a papermaking cylinder sleeve 4 comprises a processing base 1, two inner support assemblies 2 for jointly supporting and clamping the cylinder sleeve 4 are arranged on the processing base 1 to slide horizontally relative to each other; a turning mechanism 3 is arranged on the processing base 1 to slide horizontally in the same direction as the inner support assemblies 2 and is driven by the inner support assemblies 2, and the turning mechanism 3 is located between the two inner support assemblies 2.

[0036] As shown in Figure 1 and Figure 4 , two guide rails 11 are welded on the processing base 1; the inner support assembly 2 includes a rotary support 21 horizontally slidingly installed on the two guide rails 11, the rotary support 21 can be connected with a hydraulic cylinder, so as to drive the rotary support 21 to slide through the hydraulic cylinder; a rotary disc 22 is horizontally and rotationally drivenly installed on the rotary support 21, the rotary driving mode of the rotary disc 22 is a prior art, and specifically, the driving can be realized through a motor and a matching transmission system; an inner support frame 23 is fixedly installed on the rotary disc 22, a plurality of inner support modules 24 are uniformly distributed along the axial direction of the rotary disc 22 and assembled on the inner support frame 23, and an inner support driving mechanism 25 for synchronously driving the plurality of inner support modules 24 to clamp the cylinder sleeve 4 is also assembled on the inner support frame 23.

[0037] As shown in Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 , the inner support frame 23 includes two bearing end plates 232, one of which is horizontally welded with four guide columns 231 between the rotary disc 22, and the four guide columns 231 are uniformly distributed around the central axis of the rotary disc 22, an end chuck 26 is slidingly and cooperatively installed on the four guide columns 231, an end chuck spring 261 is sleeved on the guide column 231, and the two ends of the end chuck spring 261 are welded on the rotary disc 22 and the end chuck 26 respectively; four first connecting plates 233 and four second connecting plates 234 are horizontally welded between the two bearing end plates 232; the four first connecting plates 233 and the four second connecting plates 234 are uniformly and alternately distributed around the central axis of the rotary disc 22.

[0038] As shown in Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the inner support module 24 includes four inner support blocks 241 uniformly distributed around the central axis of the rotary disc 22, and the four inner support blocks 241 are slidingly and cooperatively installed on the four first connecting plates 233 one by one along the radial direction of the rotary disc 22; the inner support module 24 further includes four double-headed telescopic rods 242 alternately distributed with the four inner support blocks 241 and connected in series to form a closed loop, and the four inner support blocks 241 and the four double-headed telescopic rods 242 form a square inner support frame structure; the double-headed telescopic rod 242 includes a middle pipe 2421 and two sliding rods 2422 slidingly installed at both ends of the middle pipe 2421, and the two sliding rods 2422 are hinged to the two inner support blocks 241; each of the four double-headed telescopic rods 242 is assembled with a self-adaptive assembly 243 on the middle pipe 2421.

[0039] As shown in Figure 5、 Figure 8 and Figure 10 As shown in

[0040] As shown in Figure 1 、 Figure 4 and Figure 11 The turning mechanism 3 includes a sliding base 31 horizontally slidingly driven and mounted on the two guide rails 11, and the linear sliding driving mode of the sliding base 31 is a prior art which will not be described here; the sliding base 31 is assembled with a tool bit fixing table 32 for fixing a tool bit, and the tool bit fixing table 32 is drivingly indexed in the radial direction of the rotary disc 22; in this embodiment, the tool bit fixing table 32 can be driven to index by a hydraulic cylinder, and the indexing direction is specifically the vertical direction; in order to improve the stability during turning, the sliding base 31 is assembled with two groups of outer clamping components 34 which are commonly adapted to clamp the outer wall of the cylinder liner 4, the two groups of outer clamping components 34 are distributed in the axial direction of the rotary disc 22, the tool bit fixing table 32 is located between the two groups of outer clamping components 34, the number of the outer clamping components 34 in each group is two, and the two outer clamping components 34 in each group are symmetrically distributed on the two sides of the central axis of the rotary disc 22 in the direction which is horizontally perpendicular to the axial direction of the rotary disc 22.

[0041] As shown in Figure 1 、 Figure 4 and Figure 11As shown, the sliding base 31 is provided with two side support plates 311 horizontally and symmetrically distributed on both sides of the central shaft of the rotary disc 22, and the machining base 1 is provided with a moving guide frame 12 corresponding to each of the two side support plates 311, the moving guide frame 12 is provided with two horizontal guide rods 121, and the side support plate 311 is slidingly installed on the two horizontal guide rods 121; both of the outer clamping components 34 located on the same side of the central shaft of the rotary disc 22 are installed on the same side of the side support plate 311; the outer clamping component 34 comprises a carry-in sliding block 341 slidingly installed on the side support plate and driven by a hydraulic cylinder assembled on the side support plate; the carry-in sliding block 341 is slidingly installed with two sliding shafts 342 sliding in the same direction, the ends of the two sliding shafts 342 are commonly welded with a roller frame 343, the sliding shaft 342 is sleeved with an outer clamping spring 344, and the two ends of the outer clamping spring 344 are welded on the carry-in sliding block 341 and the roller frame 343 respectively; the roller frame 343 is horizontally rotatably installed with two sets of outer clamping guide rollers 345, and the two sets of outer clamping guide rollers 345 are distributed on the upper and lower sides of the central shaft of the rotary disc 22, in this embodiment, the number of each set of outer clamping guide rollers 345 is two, and the two sets of outer clamping guide rollers 345 form a V-shaped outer clamping notch. The sliding base 31 is welded with two top touch blocks 33, the two top touch blocks 33 are symmetrically distributed on both sides of the turning tool fixing table 32 in a direction perpendicular to the central shaft of the rotary disc 22, and the two top touch blocks 33 are arranged in the middle relative to the two sets of outer clamping components 34; the top touch block 33 is provided with a cylindrical shaft 331 axially parallel to the axial direction of the rotary disc 22, and the two ends of the cylindrical shaft 331 are movably embedded with ball bearings 332.

[0042] Before machining, in order to facilitate the placement of the cylinder sleeve 4, the distance between the two inner support assemblies 2 is in the maximum state, and the distance between the two outer clamping components 34 in each group is also in the maximum state.

[0043] During machining, the cylinder sleeve 4 can be lifted to the machining position by a steel cable rope and a crane, so that the cylinder sleeve 4 is located between the two inner support assemblies 2, and the cylinder sleeve 4 can fall on the cylindrical shaft 331 of the two top touch blocks 33, and the cylindrical shaft 331 can play a role of auxiliary supporting and limiting; then, under the condition of maintaining the lifting state, the rotary support 21 of the two inner support assemblies 2 is started, so that the two rotary supports 21 slide towards each other, and then the inner support frame 23 and the inner support module 24 extend into the cylinder of the cylinder sleeve 4, until they are clamped between the two end clamping discs 26 at the two ends of the cylinder sleeve 4, at this time, the inner support block 241 in the inner support module 24 closest to the end clamping disc 26 is completely located in the cylinder of the cylinder sleeve 4, and the inner support block 241 will not interfere with the turning of the end part of the cylinder sleeve 4.

[0044] Next, the drive motors 251 of the two inner support assemblies 2 are started simultaneously. The drive motors 251 drive the drive shaft 252 to rotate, and through the two sets of connecting rods 253 drive the four drive plates 254 to slide away from the center of the rotary table 22. The drive plates 254 indirectly drive the double-headed telescopic rods 242 to move synchronously through the adaptive components 243. Then, the two sliding rods 2422 in the double-headed telescopic rods 242 slide out in opposite directions, and synchronously drive the inner support block 241 to slide away from the central axis of the rotary table 22. This causes the inner support block 241 to tend to clamp with the inner wall of the cylinder liner 4. During the clamping process driven by the inner support drive mechanism 25, under the mutual restraint of the four double-headed telescopic rods 242 and the adaptive extension and retraction of the four adaptive components 243, each inner support module The four inner support blocks 241 in module 24 randomly come into contact with the inner wall of cylinder liner 4. The four inner support blocks 241 are always equidistant from the central axis of rotary table 22. At least one inner support block 241 in a single inner support module 24 can form an effective clamping contact with the inner wall of cylinder liner 4. Under the common inner support clamping of multiple inner support modules 24, there will inevitably be multiple inner support blocks 241 that form clamping contact with the inner wall of cylinder liner 4 in the circumferential direction. The distribution center of all inner support blocks 241 is on the central axis of rotary table 22. Without affecting the inner support clamping, the reliability and stability of the inner support clamping are improved. It also greatly reduces the deviation error between the inner support clamping center and the center of cylinder liner 4 itself. This can indirectly improve the uniformity of the cylinder liner 4 wall thickness after turning, so as to ensure the quality of cylinder liner 4 in use.

[0045] After the internal support clamping is completed, the steel cable can be removed. During actual machining, the machining mechanism 3 can move along the axial direction of the cylinder liner 4, and first machine one end of the cylinder liner 4, then machine the entire outer wall of the cylinder liner 4, and finally machine the other end. Specifically, ... Figure 3 As shown, if the turning process is performed from left to right, firstly, the turning mechanism 3 is moved to the leftmost position. When it is at the leftmost position, the ball bearings 332 on the same side of the two cylindrical shafts 331 are in contact with the left end chuck 26, so that the left end chuck 26 is separated from the end of the cylinder liner 4 to be turned. The contact of the ball bearings 332 reduces the resistance of the end chuck 26 rotating synchronously with the inner support frame 23. The cutting tool is located between the left end chuck 26 and the left end of the cylinder liner 4. Then, the right set of external clamping components 34 is synchronously activated, so that the cylinder liner 4 is clamped between the two external clamping components 34 on the right side. Next, the turning mechanism 3 slides to the right as a whole, so that the cutting tool is aligned with the left end of the cylinder liner 4. After the alignment is completed, the two rotary tables 22 are started synchronously, and the two inner support assemblies 2 synchronously drive the cylinder liner 4 to rotate. The cutting tool advances radially, thereby completing the turning of the left end of the cylinder liner 4.

[0046] Subsequently, the turning tool is retracted from the left end of the cylinder liner 4 and re-sets the tool with the outer wall near the left end of the cylinder liner 4, then the turning mechanism 3 moves along the cylinder liner 4 in the axial direction to turn the outer wall of the cylinder liner 4, and in the moving process, the left end chuck 26 is repositioned to form clamping with the left end of the cylinder liner 4 again, and when the left group of outer clamping components 34 moves to avoid the left end chuck 26, the left group of outer clamping components 34 is activated and clamps the cylinder liner 4 synchronously with the right group of outer clamping components 34 to improve the stability during turning.

[0047] When moving to the right to the position where the right group of outer clamping components 34 contacts the right end chuck 26, the right group of outer clamping components 34 is retracted to move away from the position of the right end chuck 26 and continues to move to complete the turning of the right part of the outer wall, and similarly, when moving to a certain position on the right, the right end chuck 26 is gradually pushed open by the two cylindrical shafts 331 and the right side of the ball 332, so that it is separated from the right end of the cylinder liner 4, then it is re-set with the right end to complete the turning of the right end of the cylinder liner 4.

[0048] After completing the turning of the outer wall and both ends of the cylinder liner 4, the steel cable is placed again, then the two inner support assemblies 2 are loosened, and finally the cylinder liner 4 is lifted out.

[0049] The present application provides an engine cylinder body precision assembly machining device, which is provided with two inner support assemblies 2, and the inner support assembly 2 is provided with a plurality of independent inner support modules 24 that can synchronously drive and clamp the inner wall of the cylinder liner 4, thereby forming a plurality of inner support clamping contact points that are distributed in the circumferential direction and have a common clamping center, which improves the problem that the clamping center deviates due to the unevenness of the inner wall of the cylinder liner 4 in the existing inner support chuck structure, and makes the wall thickness of the cylinder liner 4 after turning uneven, improves the reliability and stability of the inner support clamping, and greatly reduces the deviation error between the inner support clamping center and the center of the cylinder liner 4 itself; in addition, two groups of outer clamping components 34 that move synchronously with the turning process and provide outer wall clamping for the cylinder liner 4 are provided, a multiple center alignment structure with internal support and external clamping is adopted, which improves the turning stability and further improves the turning concentricity; in summary, the device provided by the present application can continuously turn the outer wall and both ends of the cylinder liner 4, which improves the turning precision on the basis of improving the turning stability, and ensures the turning quality of the cylinder liner 4 and the subsequent use effect.

[0050] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0051] In the description of the application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection", "installation", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood through specific circumstances.

[0052] The preferred embodiments of the application are described above. It needs to be understood that the application is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make many possible changes and modifications, or modify equivalent embodiments without departing from the technical solution of the application, which does not affect the essential content of the application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application, without departing from the technical solution of the application, still belongs to the protection scope of the technical solution of the application.

Claims

1. A precision machining apparatus for engine cylinder blocks, characterized in that: The machining base (1) is provided with two inner support assemblies (2) for clamping the cylinder sleeve (4) together, and a turning mechanism (3) is driven to slide horizontally on the machining base (1) in the same direction as the inner support assemblies (2) and is located between the two inner support assemblies (2). The inner support assembly (2) comprises a rotary support (21) driven to slide horizontally on the machining base (1), a rotary disc (22) driven to rotate horizontally on the rotary support (21), an inner support frame (23) fixedly installed on the rotary disc (22), a plurality of inner support modules (24) distributed axially along the rotary disc (22) and assembled on the inner support frame (23), and an inner support driving mechanism (25) for synchronously driving the plurality of inner support modules (24) to clamp the cylinder sleeve (4). The turning mechanism (3) comprises a sliding base (31) driven to slide horizontally on the machining base (1), a turning tool fixing table (32) for fixing a turning tool and driven to advance in the radial direction of the rotary disc (22) and assembled on the sliding base (31), and two groups of outer clamping components (34) for adaptively clamping the outer wall of the cylinder sleeve (4) and axially distributed along the rotary disc (22) and assembled on the sliding base (31), wherein the turning tool fixing table (32) is located between the two groups of outer clamping components (34), each group of outer clamping components (34) comprises two outer clamping components (34), and the two outer clamping components (34) in each group are symmetrically distributed on both sides of the central axis of the rotary disc (22) in a direction perpendicular to the axial direction of the rotary disc (22). The inner support block (241) is slidingly fitted on the inner support frame (23) in the radial direction of the rotary disc (22). The inner support module (24) further comprises a plurality of double-headed telescopic rods (242) alternately distributed with the at least three inner support blocks (241) and connected in series and forming a closed loop, and a self-adaptive assembly (243) is fixedly assembled at the center between both ends of the double-headed telescopic rod (242) and elastically telescopes in the radial direction of the rotary disc (22). The inner support driving mechanism (25) comprises a plurality of driving plates (254) one-to-one corresponding to the plurality of double-headed telescopic rods (242) in the same inner support module (24) and slidingly driven in the radial direction of the rotary disc (22) and assembled on the inner support frame (23), and the plurality of self-adaptive assemblies (243) distributed in the axial direction of the rotary disc (22) in the plurality of inner support modules (24) are fixedly assembled on the corresponding driving plates (254). The inner support driving mechanism (25) further comprises a driving shaft (252) coaxially arranged with the rotating disc (22) and horizontally rotatably installed on the inner support frame (23); the driving plate (254) is vertically provided with sliding plates (2541) at two axial ends of the rotating disc (22), and the two sliding plates (2541) are slidingly and fitly installed on the inner support frame (23); the driving shaft (252) is fixed with two hinge joints (2521) corresponding to the two sliding plates (2541); the hinge joints (2521) are correspondingly hinged with the sliding plates (2541) on the same side of the driving plate (254). The double-head telescopic rod (242) comprises a middle pipe (2421) and two sliding rods (2422) slidingly installed at two ends of the middle pipe (2421), and the two sliding rods (2422) are hinged on the two inner support blocks (241); the self-adaptive assembly (243) is connected to the middle pipe (2421).

2. The apparatus of claim 1 wherein: The inner support frame (23) is provided with an end chuck (26) for elastically clamping the end of the cylinder sleeve (4); the sliding base (31) is fixed with at least one top contact block (33), when the turning mechanism (3) moves towards one side of the inner support assembly (2), the top contact block (33) contacts the end chuck (26) on the side, so that the end chuck (26) is separated from the end of the cylinder sleeve (4).

3. An apparatus for precision assembly machining of an engine block according to claim 2, characterized in that: When the end chuck (26) clamps the end of the cylinder sleeve (4), the inner support block (241) in the inner support module (24) closest to the end chuck (26) is completely located in the cylinder sleeve (4).

4. The apparatus of claim 1 wherein: The sliding base (31) is provided with two side support plates (311) horizontally and symmetrically distributed on both sides of the central axis of the rotating disc (22), and the two outer clamping components (34) on the same side of the central axis of the rotating disc (22) are installed on the same side of the side support plate (311); the outer clamping component (34) comprises a carry slide (341) horizontally and slidingly installed on the side support frame, a plurality of sliding shafts (342) are slidingly arranged on the carry slide (341), a roller frame (343) is fixed at the ends of the sliding shafts (342), an outer clamping spring (344) is sleeved on the sliding shaft (342), and the two ends of the outer clamping spring (344) are fixed on the carry slide (341) and the roller frame (343) respectively; two groups of outer clamping guide rollers (345) are rotatably installed on the roller frame (343), and the two groups of outer clamping guide rollers (345) are distributed on the upper and lower sides of the central axis of the rotating disc (22).

5. The apparatus of claim 2 wherein: The top contact block (33) is provided with a cylindrical shaft (331) axially parallel to the rotating disc (22), and the two ends of the cylindrical shaft (331) are movably embedded with rolling balls (332).

6. An engine block precision component machining apparatus according to claim 5, characterized by: The inner support frame (23) comprises a plurality of guide columns (231) fixed horizontally on the rotary disc (22); the end chuck disc (26) is slidingly installed on the plurality of guide columns (231); the guide columns (231) are sleeved with end chuck springs (261), and the two ends of the end chuck springs (261) are fixed on the rotary disc (22) and the end chuck disc (26) respectively.

7. An apparatus for precision assembly machining of an engine block according to claim 6, characterized in that: The inner support frame (23) further comprises two bearing end plates (232), one of which is fixed at the end of the plurality of guide columns (231); a plurality of first connecting plates (233) corresponding to the plurality of inner support blocks (241) in the inner support module (24) are fixed horizontally between the two bearing end plates (232), the inner support blocks (241) are slidingly installed on the corresponding first connecting plates (233); a plurality of second connecting plates (234) corresponding to the plurality of driving plates (254) are also fixed horizontally between the two bearing end plates (232), and two sliding plates (2541) provided on the driving plate (254) are slidingly installed on the corresponding second connecting plate (234); the driving shaft (252) is horizontally rotatably installed on the two bearing end plates (232).

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