A V-shaped casting sleeve cylinder sleeve positioning device and method

Abstract

The application relates to a V-shaped casting sleeve cylinder sleeve positioning device and method; the positioning device comprises an X-direction centering positioning module, a Y-direction centering positioning module, Z-direction positioning points and Z-direction auxiliary supports; the centering clamp X of the X-direction centering positioning module simultaneously drives X-direction linkage module 1 and X-direction linkage module 2 to move inward, so that the positioning points X1, X2, X3 and X4 are positioned in the X direction of the V8 cylinder; when X-direction linkage module 1 and X-direction linkage module 2 move inward, the V8 cylinder slides downward, the positioning surface of the V8 cylinder reaches the Z-direction positioning points Z1, Z2 and Z3, and Z-direction positioning is completed; the centering clamp Y of the Y-direction centering positioning module simultaneously drives Y-direction positioning point Y1 and Y-direction positioning point Y2 to move inward, so that the positioning points Y1 and Y2 are positioned in the Y direction of the V8 cylinder; the application can guarantee the position degree of the cylinder sleeve and solve the problem of the position degree precision of the aluminum alloy cylinder sleeve of the V-shaped 8-cylinder engine during machining.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cylinder processing, and relates to a V-shaped cast-in sleeve cylinder sleeve positioning device and method. BACKGROUND

[0002] Most V8 cylinder blocks produced by foreign automobile enterprises adopt the sleeve insertion process, which can realize uniform sleeve wall thickness and ensure uniform heat dissipation, but the sleeve insertion process has the problems of sleeve upward movement and sleeve fracture.

[0003] The traditional V-shaped cylinder processing technology: X\Y\Z positioning points are on multiple sand cores, and due to manufacturing errors and assembly errors, the positioning reference and the center position of the sleeve cannot be accurately guaranteed, so the 6-point cylinder shape as the positioning reference processing technology is not suitable for cast-in sleeve cylinder processing.

[0004] The cylinder block of a new type of V8 engine in China innovatively adopts the cast-in sleeve process, that is, the sleeve and the cylinder blank are integrally cast into shape, and the sleeve position degree is required to be less than or equal to φ0.5mm, which is higher than the international advanced level of less than or equal to φ1.0mm. The accumulated error of the casting sand core manufacturing and assembly directly affects the sleeve position accuracy, the traditional sleeve insertion cylinder processing is a method of taking the shape as the processing positioning reference, which cannot meet the sleeve position degree requirement of the cast-in sleeve cylinder, affects the heat dissipation effect, and is prone to problems such as cylinder pulling and cylinder explosion. SUMMARY

[0005] The application aims to solve the sleeve position accuracy problem of domestic high-end V-shaped 8-cylinder aluminum alloy cylinder blocks (see Figure 1 ) during processing, and provides a V-shaped cast-in sleeve cylinder sleeve positioning device and method.

[0006] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0007] To solve the above technical problems, the application is realized by adopting the following technical scheme:

[0008] A V-shaped cast-in sleeve cylinder sleeve positioning device, comprising:

[0009] X-direction centering positioning module, Y-direction centering positioning module, Z-direction positioning point, Z-direction auxiliary support;

[0010] The X-centering positioning module is composed of two sets of X-centering clamps X driving X1, X2, X3, and X4 positioning points;

[0011] The Y-centering positioning module is composed of one set of Y-centering clamps Y driving Y1 and Y2 positioning points;

[0012] The X-centering positioning module of the X-centering clamps X simultaneously drives the X-direction linkage module 1 and the X-direction linkage module 2 to move inward, so that the positioning points X1, X2, X3, and X4 are positioned in the X direction of the V8 cylinder body; when the X-direction linkage module 1 and the X-direction linkage module 2 move inward, the V8 cylinder body slides downward, and the positioning surface of the V8 cylinder body reaches the Z-direction positioning points Z1, Z2, and Z3, and the Z-direction positioning is completed;

[0013] The Y-centering positioning module of the Y-centering clamps Y simultaneously drives the Y1 and Y2 positioning points to move inward, so that the positioning points Y1 and Y2 are positioned in the Y direction of the V8 cylinder body;

[0014] The Z-direction auxiliary support rear clamps the Z4 positioning point.

[0015] Further, the V-shaped cast sleeve cylinder body sleeve positioning device further comprises a shockproof auxiliary support and a hydraulic control system;

[0016] The shockproof auxiliary support is used to prevent the V8 cylinder body from moving;

[0017] The hydraulic control system is used for X and Y direction positioning, clamping the V8 cylinder body, and pressure control.

[0018] A V-shaped cast sleeve cylinder body sleeve positioning method, the V8 cylinder body positioning method comprises the following steps:

[0019] In the X-centering positioning module, the X-centering clamps X synchronously pull the X-direction linkage module 1 and the X-direction linkage module 2 inward, so that the four X-direction positioning points move inward synchronously, and the V8 cylinder body is positioned in the X direction;

[0020] The X-centering clamps X drive the two X-direction linkage modules, and under the pushing of the X1, X2, X3, and X4 positioning points, the X center of the V8 cylinder body coincides with the center of the positioning device;

[0021] In the Y-centering positioning module, the Y-centering clamps Y synchronously pull the Y1 and Y2 positioning points, so that the Y1 and Y2 positioning points move to the center simultaneously and push the workpiece, and the V8 cylinder body is positioned in the Y direction.

[0022] Further, the V-shaped cast sleeve cylinder body sleeve positioning method specifically comprises the following steps:

[0023] Step 1: At the left and right top surface edges of the V8 cylinder body, two points are taken as Z-direction plane positioning points, one of which is an auxiliary support point, and the V8 cylinder body is placed in the clamp;

[0024] Step 2, take the four points on the cylinder liner generatrix of the remote 1, 4, 5, 8 cylinders as X-direction positioning points, and the X-direction centering positioning module is synchronously pushed down, so that the midpoint of the distance between the cylinder centers of 1 and 8 cylinders coincides with the center of the positioning device in the X direction, the midpoint of the distance between the cylinder centers of 4 and 5 cylinders coincides with the center of the positioning device in the X direction, and the line connecting the midpoint of the distance between the cylinder centers of 1 and 8 cylinders and the midpoint of the distance between the cylinder centers of 4 and 5 cylinders coincides with the center line of the positioning device.

[0025] Step 3, the pressure of the X-direction centering positioning module is unloaded to 0 Mba through the hydraulic control system.

[0026] Step 4, take the two points on the generatrix of the proximal ends of the two cylinder holes of the right 5 and 8 cylinders as Y-direction positioning points, when the Y-direction centering positioning module is started, the pressure of the X-direction centering positioning module is unloaded to 0 Mba, and the pressure is continuously controlled at 0 Mba, the V8 cylinder body is displaced along the Y direction, and under the synchronous push of the Y-direction centering positioning module, the cylinder center coincides with the design center of the V8 cylinder body.

[0027] Step 5, the pressure of the Y-direction centering positioning module is unloaded to 0 Mba through the hydraulic control system, and the pressure is continuously controlled at 0 Mba.

[0028] Step 6, clamp three Z-direction plane positioning points, at this time the V8 cylinder body can only move up and down slightly in the positioning device limited by the X-direction four positioning points and the Y-direction two positioning points, under the action of the Z-direction clamping force, the V8 cylinder body is positioned and clamped in the Z direction.

[0029] Step 7, in this posture, the hydraulic control system clamps the workpiece in the X and Y directions; the V8 cylinder body is initially positioned by the three Z points, two X points and one Y point, satisfying the six-point positioning principle.

[0030] The midpoint of X1 and X3 forms a point positioning, the midpoint of X2 and X4 forms a point positioning, and the midpoint of Y1 and Y2 forms a point positioning.

[0031] Further, when the V8 cylinder body is initially placed in the positioning device, the distance of the sliding block is greater than the distance between the cylinder holes, and the V8 cylinder body cannot be positioned in the Z direction, at this time the centering clamp module is needed to pull down the piston rod of the oil cylinder, so that the X-direction linkage module moves inward, and the sliding block distance of the V8 cylinder body gradually decreases, and the X-direction positioning points gradually extend into the cylinder hole.

[0032] Further, the three Z-direction positioning points Z1, Z2 and Z3 are at the same height, and the height of the Z-direction auxiliary support Z4 is slightly lower than that of the Z-direction positioning points Z1, Z2 and Z3 by 0.3 mm, which prevents over-positioning of the four points on the plane and avoids the workpiece clamping error caused by the deviation of the cylinder body gravity center and the support gravity center.

[0033] Further, the hydraulic control system control method is as follows:

[0034] Action one: X to the center positioning module to the V8 cylinder, V8 cylinder X to the positioning accurate after the pressure is reduced to 0Mba and control at 0Mba pressure, when Y to clamp, V8 cylinder X to the displacement is limited by X positioning point, at this time V8 cylinder can only move along Y direction;

[0035] Action two: Y to the center positioning module positioning point Y1, Y2 to the cylinder, make the cylinder Y to the center accurate, then reduce the pressure of Y to the center positioning module to 0Mba and control at 0Mba pressure; In Z to clamp, limit the workpiece along Y direction while V8 cylinder moves along Z direction a little;

[0036] Action three: shockproof auxiliary support to the position, play the role of strengthening the prevention of V8 cylinder movement;

[0037] Action four: Z1, Z2, Z3 three point pressure cylinder, start Z to the auxiliary support after Z4 point.

[0038] Further, a V type cast sleeve cylinder sleeve positioning method, further comprising the steps of 8: processing the bottom plane of V8 cylinder and processing two process pin holes on the bottom plane, all subsequent processing procedures are based on the two pin holes as the process positioning reference.

[0039] Further, the positioning device is used for positioning the cylinder sleeve, so that the cylinder sleeve is consistent with the center deviation of the cylinder body, and all subsequent processing procedures are based on the two pin holes as the positioning reference for processing. After the processing of the cylinder sleeve, the wall thickness of the cylinder sleeve is uniform, and the position degree is less than or equal to 0.5mm.

[0040] Further, a V type cast sleeve cylinder sleeve positioning method, between step 5 and step 6, the step of starting the shockproof auxiliary support is set.

[0041] Between step 6 and step 7, the step of starting Z to the auxiliary support and pressing V8 cylinder is set.

[0042] Compared with the prior art, the beneficial effects of the present application are:

[0043] The V-shaped cast sleeve cylinder body sleeve positioning machining process adopts sleeve bidirectional centering positioning, can guarantee the sleeve position degree, and discards the traditional mode of taking the appearance of the sleeve cylinder body as the positioning reference. The process method respectively takes the distal cylinder hole 1 cylinder, 4 cylinder, 5 cylinder and 8 cylinder side bus as the X-direction positioning reference, makes the axis of the left and right side cylinder holes form a plane respectively, the intersection line of the two planes coincides with the fixture design reference, guarantees that the left and right direction wall thickness of the sleeve is uniform, the Y-direction adopts the centering positioning module to center the cylinder hole bus, makes the Y-direction cylinder hole center of the workpiece closer to the design center, and the Z-direction adopts three-point main support + one-point auxiliary support as the positioning and clamping point. The main support and the auxiliary support adopt the micro unequal height design, avoids the workpiece clamping deviation. The slide type workpiece positioning solves the design problem of the narrow cylinder hole space. BRIEF DESCRIPTION OF DRAWINGS

[0044] The application will be further described below in combination with the drawings:

[0045] Figure 1 It is an aluminum alloy cylinder body appearance positioning schematic diagram of the V-shaped 8-cylinder engine;

[0046] Figure 1 The symbol mark means:

[0047] 1, Z-direction positioning point 1; 2, Z-direction positioning point 2; 3, Y-direction positioning point Y1; 4, X-direction positioning point X2; 5, Z-direction positioning point 4; 6, Z-direction positioning point 3; 7, X-direction positioning point X1;

[0048] Figure 2a It is a No. 1 cylinder hole section Figure 1 ;

[0049] Figure 2b It is a No. 1 cylinder hole section Figure 1 ;

[0050] Figure 2b The symbol mark means:

[0051] 1, No. 1 cylinder; 2, No. 8 cylinder; 3, Y-direction positioning point Y1; 4, X-direction positioning point X3; 5, X-direction positioning point X1;

[0052] Figure 2c It is a No. 4 cylinder hole section Figure 1 ;

[0053] Figure 2d It is a No. 4 cylinder hole section

[0054] Figure 2d The symbol mark means:

[0055] 1, No. 4 cylinder; 2, No. 5 cylinder; 3, Y-direction positioning point Y2; 4, X-direction positioning point X4; 5, X-direction positioning point X2;

[0056] Figure 2e Schematic diagram of Z-direction positioning point Figure 1

[0057] Figure 2f Schematic diagram of Z-direction positioning point 2

[0058] Figure 2f Symbolic mark meaning:

[0059] 1, 5 cylinder; 2, 4 cylinder; 3, Z2; 4, Z1; 5, 1 cylinder; 6, 8 cylinder; 7, Z3; 8, Z4.

[0060] Figure 3 Schematic diagram of V-type cast sleeve cylinder block cylinder sleeve positioning device machining clamp

[0061] Figure 4a Schematic diagram of linkage type X-direction centering positioning module

[0062] Figure 4b Schematic diagram of Y-direction centering positioning module

[0063] Figure 4c Schematic diagram of X, Y positioning point integrated structure

[0064] Figure 4d Schematic diagram of X, Y-direction integrated structure

[0065] Figure 4d Symbolic mark meaning:

[0066] 1, Y-direction positioning point Y1; 2, stop block; 3, X positioning point X3

[0067] Figure 5 Schematic diagram of workpiece V8 cylinder block sliding into position

[0068] Figure 6 Schematic diagram of Z-direction auxiliary support height

[0069] Figure 7 Hydraulic control system sequence diagram

[0070] Figure 8 Schematic diagram of V-type cast sleeve cylinder block cylinder sleeve positioning device overall structure

[0071] Figure 8 Symbolic mark meaning:

[0072] ​1, Z2 is a Z-direction positioning point; 2, X2 is an X-direction positioning point; 3, X4 is an X-direction positioning point; 4, Y2 is a Y-direction positioning point; 5, Z4 is a Z-direction auxiliary support; 6, X-direction linkage module 1; 7, Z1 is a Z-direction positioning point; 8, stop block; 9, X1 is an X-direction positioning point; 10, centering clamp X; 11, shockproof auxiliary support; 12, X3 is an X-direction positioning point; 13, Y1 is a Y-direction positioning point; 14, stop block; 15, Y2 is a Y-direction positioning point; 16, X-direction linkage module 2; 17, centering clamp Y; 18, four-axis rotary table. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described in more detail below with reference to the drawings of the embodiments of the present application. In the drawings, the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0074] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying 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 on the scope of protection of the present application.

[0075] The present application will be described in detail below with reference to the drawings:

[0076] "V-type cast sleeve cylinder sleeve positioning" is a way of workpiece positioning when the V-type cast sleeve cylinder is machined by sleeve positioning. The cast sleeve is a casting process (the sleeve is cast with aluminum water at the same time), and another process is the sleeve insertion process. The sleeve is a machined wear-resistant sleeve.

[0077] The cast sleeve cylinder is a casting process in which the sleeve is cast with aluminum liquid in the cylinder blank at the same time. The X-direction centering positioning module makes the left and right sleeves of the cylinder equal in distance from the center line of the cylinder. The Y-direction centering positioning module makes a row of sleeves equal in distance from the center line of the cylinder.

[0078] An embodiment of the present application is provided, with reference to Figure 1 , Figure 8A V-shaped casting sleeve cylinder sleeve positioning device, comprising:

[0079] The X-axis centering positioning module, the Y-axis centering positioning module, the Z-axis positioning point (Z1, Z2, Z3), the Z-axis auxiliary support (Z4), the shockproof auxiliary support, the hydraulic control system, and the four-axis turntable.

[0080] The present application aims to provide a jig positioning principle and a positioning method.

[0081] The X-axis centering positioning module is composed of two sets of centering clamps driving X1, X2, X3, and X4 positioning points.

[0082] The X-axis centering positioning module is driven by the centering clamp X to simultaneously drive the X-axis linkage module 1 and the X-axis linkage module 2 to move inward, so that the positioning points X1, X2, X3, and X4 are positioned in the X direction of the V8 cylinder.

[0083] When the X-axis linkage module 1 and the X-axis linkage module 2 move inward, the workpiece slides downward, and the positioning surface of the V8 cylinder reaches the Z-axis positioning points Z1, Z2, and Z3, and the Z-axis positioning is completed.

[0084] The Y-axis centering positioning module is composed of a centering clamp Y driving the Y-axis positioning point Y1 and the Y-axis positioning point Y2 to move inward, so that the positioning points Y1 and Y2 are positioned in the Y direction of the V8 cylinder.

[0085] The auxiliary support is a hydraulic element. The hydraulic control system is used to clamp the V8 cylinder in the X and Y directions.

[0086] The present application provides another embodiment, a V-shaped casting sleeve cylinder sleeve positioning method, and a V8 cylinder positioning process method.

[0087] The linkage type X-axis centering clamp module is used for centering positioning. The X-axis centering positioning module is driven by the linkage device to position the X-axis positioning points X, X2, X3, and X4 on the workpiece. The X-axis centering clamp X drives the two X-axis linkage modules, and the V8 cylinder X center coincides with the jig center under the pushing of the X-axis positioning points (X1, X2, X3, X4).

[0088] The Y-direction centering positioning module synchronously pulls the positioning points Y1 / Y2, so that the positioning points Y1 and Y2 move to the center at the same time and push the workpiece, so as to achieve the V8 cylinder Y-direction centering positioning. The center of the clamp is the center designed when the clamp is designed, and ideally coincides with the positioning center of the workpiece.

[0089] The embodiments provided by the application are described below with reference to Figure 1 , Figure 2a , Figure 2b , Figure 2c , Figure 2d , Figure 2e , Figure 2f , Figure 3 , Figure 4a , Figure 4b , Figure 4c , Figure 4d , Figure 5 , Figure 6 , Figure 7 , Figure 8 A V-shaped cast sleeve cylinder sleeve positioning method is provided, and the specific steps are as follows:

[0090] Step 1. Two points are taken on the left and right top surface edges of the V8 cylinder bore as Z-direction plane positioning points, one of which is an auxiliary support point, and the V8 cylinder is placed in the clamp.

[0091] Step 2. Four points on the generatrix of the far-end sleeve (1, 4, 5, 8 cylinders) are taken as X-direction positioning points. The X-direction centering positioning module is synchronously pushed down, so that the midpoint of the 1, 8 cylinder sleeve center distance coincides with the X-direction center of the clamp, the midpoint of the 4, 5 cylinder sleeve center distance coincides with the X-direction center of the clamp, and the line connecting the midpoint of the 1, 8 cylinder sleeve center distance and the midpoint of the 4, 5 cylinder sleeve center distance is relatively coincident with the center line of the clamp; the intersection line of the two side bore centers is relatively coincident with the main shaft hole center line; the intersection line of the two side bore centers is the intersection line of the plane formed by the 1, 4 sleeve center axis and the plane formed by the 5, 8 sleeve center axis.

[0092] Step 3. The pressure of the X-direction centering positioning module is unloaded to 0Mba through the hydraulic control system; and the 0Mba pressure is continuously maintained. The X-direction centering positioning module is composed of a centering clamp, a linkage module 1, a linkage module 2, positioning points X1, X2, X3 and X4.

[0093] Step 4. Two points on the high level of the generatrix of the right side 5, 8 cylinders are taken as Y-direction positioning points. When the Y-direction centering positioning module is started, the pressure of the X-direction centering positioning module is unloaded to 0Mba, the workpiece is displaced along the Y-direction, and the sleeve center is coincident with the design center of the workpiece under the synchronous pushing of the Y-direction centering positioning module.

[0094] Step 5. The pressure of the Y-direction centering positioning module is unloaded to 0Mba through the oil pressure control system; and the 0Mba pressure is continuously maintained.

[0095] Step 6, start Z shockproof auxiliary support.

[0096] Step 7, clamp three Z plane positioning points, at this time, the workpiece in the clamp is limited by X 4 positioning points and Y 2 positioning points, and can only be slightly displaced up and down, and is positioned and clamped in the Z direction under the action of the Z clamping force.

[0097] Step 8, clamp Z4 positioning point after starting Z auxiliary support; the auxiliary support shown in Figure 5 is a hydraulic element.

[0098] Step 9, in this posture, the hydraulic control system clamps the workpiece in the X and Y directions. The workpiece is initially positioned by Z three points, X two points and Y one point, which meets the six-point positioning principle, that is, the midpoint of X1 and X3 forms a point positioning, the midpoint of X2 and X4 forms a point positioning, and the midpoint of Y1 and Y2 forms a point positioning.

[0099] Step 10, the bottom plane of the V8 cylinder body and two process pin holes on the bottom plane are machined, and all subsequent machining process references are based on the one-plane two-pin process positioning reference; since the clamp is concentrically positioned with the cylinder sleeve, the cylinder sleeve is uniformly deviated along the center of the cylinder body, and all subsequent machining processes are machined based on the one-plane two-pin positioning reference, so that the cylinder sleeve is uniformly machined after the rear wall thickness, close to the ideal position effect, and the position degree is less than or equal to 0.5 mm.

[0100] The positioning and clamping position space of the process method is small, and the design difficulty of the clamp concentric travel and concentric module structure is large, and in practice, the workpiece sliding method and the integrated structure design of the 5 and 8 cylinder hole X and Y positioning points are adopted to solve the difficulty of small positioning area space.

[0101] The cylinder sleeve concentric positioning machining process is first created, the position of each cylinder sleeve is accurate, the circumferential wall thickness of the cylinder sleeve is uniform, the uniform heat dissipation is effectively realized, and the problems such as cylinder pulling and cylinder explosion are eliminated.

[0102] In addition, the process method can be realized in various machining equipment, for example: vertical milling, horizontal milling, cradle machining center and the like, the machining equipment has strong selectivity, the process is stable, and the like.

[0103] X-direction linkage type four-point centering, the X-direction centering clamp simultaneously drives four positioning points to inwardly centering positioning and clamping, the positioning point travel is same, and the midpoint centering is more accurate.

[0104] Y-direction centering positioning module design, the Y-direction centering clamp simultaneously drives two positioning points to inwardly centering positioning and clamping, the positioning point travel is same, and the midpoint centering is more accurate.

[0105] Figure 4dThe integrated structure design of the X-direction positioning point and the Y-direction positioning point in the K part makes the narrow cylinder hole space have the functions of X-direction positioning, Y-direction positioning and workpiece sliding block. The X / Y positioning module structure design solves the problem of positioning space being too narrow to arrange the positioning module.

[0106] The sliding workpiece positioning design solves the problem of small cylinder positioning area space and positioning point structure design. Referring to Figure 5 , when the workpiece is initially placed in the clamp, the distance of the sliding block is greater than the distance between the cylinder holes, and the workpiece cannot be positioned in the Z direction. At this time, the centering clamp module is needed to move the piston rod downward, the X-direction linkage module moves inward, the distance of the workpiece sliding block gradually decreases, and the X-direction positioning point gradually extends into the cylinder hole.

[0107] The Z-direction auxiliary support with slight unequal height can prevent over-positioning of the plane 4 points and avoid the workpiece deviation caused by the deviation of the cylinder body gravity center and the support gravity center. Referring to Figure 6 , the three Z-direction positioning points Z1, Z2 and Z3 are at the same height, and the height of the Z-direction auxiliary support Z4 is slightly lower than the height of the Z-direction positioning points Z1, Z2 and Z3 by 0.3 mm. This can prevent over-positioning of the plane 4 points and avoid the workpiece deviation caused by the deviation of the cylinder body gravity center and the support gravity center.

[0108] The hydraulic control system principle and pressure limiting application make the positioning point not move backward and ensure that the workpiece moves a small amount in another direction. Referring to Figure 7 , the V8 cylinder processing clamp action sequence.

[0109] Action one: the X-direction centering positioning module positions the workpiece inward, and the pressure is controlled at 0 Mba and kept constant after the workpiece is accurately positioned in the X direction. This avoids the workpiece moving backward when the Y-direction clamp is tightened.

[0110] Action two: the positioning points Y1 and Y2 of the Y-direction centering positioning module position the cylinder inward, and the pressure of the Y-direction centering positioning module is reduced to 0 Mba and kept constant after the cylinder is accurately positioned in the Y direction. When the Z-direction clamp is tightened, the workpiece can move a small amount in the Z direction while being limited from moving in the Y direction.

[0111] Action three: the anti-vibration auxiliary support is positioned, which strengthens the prevention of workpiece movement.

[0112] Action four: the three points Z1, Z2 and Z3 press the cylinder, and the Z-direction auxiliary support is pressed after being started.

[0113] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any modification, equivalent replacement and improvement within the technical range disclosed by the present application and within the spirit and principle of the present application should be covered within the protection scope of the present application. Meanwhile, the contents not described in detail in the specification are all the prior art known by the skilled in the art.

Claims

1. A V-shaped cast cylinder liner positioning device, characterized in that, include: X-axis centering positioning module; Y-axis centering positioning module; Z-axis positioning points Z1, Z2, Z3; Z-axis auxiliary support positioning point Z4; The X-axis alignment module includes two sets of X-axis alignment clamps and X-axis positioning points X1, X2, X3, and X4; the Y-axis alignment module includes one set of Y-axis alignment clamps and Y-axis positioning points Y1 and Y2. The X-axis alignment module is driven by two sets of X-axis alignment clamps to move X-axis linkage module 1 and X-axis linkage module 2 inward, so that the X-axis positioning points X1, X2, X3, and X4 are aligned with the X-axis of the V8 cylinder block; wherein the X-axis positioning points X1, X2, X3, and X4 are taken from four points of equal height on the cylinder bore generatrix of the distal cylinder liners 1, 4, 5, and 8. As X-axis linkage module 1 and X-axis linkage module 2 move inward, the workpiece slides down, and the positioning surface of the V8 cylinder reaches the Z-axis positioning points Z1, Z2, and Z3, thus completing the Z-axis positioning. The Y-axis alignment module is driven by a set of Y-axis alignment clamps to move the Y-axis positioning points Y1 and Y2 inward, so that the Y-axis positioning points Y1 and Y2 are aligned with the Y-axis of the V8 cylinder block; wherein the Y-axis positioning points Y1 and Y2 are taken from two points of equal height on the near end generatrix of the cylinder bores of cylinders 5 and 8 on the right side.

2. The V-shaped cast cylinder liner positioning device according to claim 1, characterized in that: It also includes earthquake-resistant auxiliary supports and a hydraulic control system; The shock-absorbing auxiliary support is used to prevent the V8 cylinder block from moving; The hydraulic control system is used for positioning in the X and Y directions, clamping the V8 cylinder, and pressure control.

3. The positioning method of the V-shaped cast cylinder liner positioning device according to claim 1, characterized in that, Specifically, the following steps are included: Step 1: Take two points on each of the left and right top edges of the cylinder bore of the V8 cylinder block as Z-axis plane positioning points. Three of these points are Z-axis positioning points, and the other point is a Z-axis auxiliary support point. Place the V8 cylinder block in the fixture. Step 2: Take four points of equal height on the cylinder liner generatrices of cylinders 1, 4, 5, and 8 at the far end as X-direction positioning points X1, X2, X3, and X4. Under the synchronous push of the X-direction centering positioning module, make the midpoint of the distance between the centers of cylinder liners of cylinders 1 and 8 coincide with the X-direction center of the positioning device, and the midpoint of the distance between the centers of cylinder liners of cylinders 4 and 5 coincide with the X-direction center of the positioning device. That is, the line connecting the midpoint of the distance between the centers of cylinder liners of cylinders 1 and 8 and the midpoint of the distance between the centers of cylinder liners of cylinders 4 and 5 coincides with the center line of the positioning device. Step 3: Release the pressure of the X-axis centering module to 0 MPa through the hydraulic control system; Step 4: Using the two points of equal height near the generatrix of the two cylinder bores of cylinders 5 and 8 on the right as Y-direction positioning points Y1 and Y2, when the Y-direction centering positioning module is activated, the pressure of the X-direction centering positioning module is reduced to 0Mba and continuously controlled at 0Mba. The V8 cylinder block is displaced along the Y direction, and under the synchronous push of the Y-direction centering positioning module, the cylinder liner center coincides with the design center of the V8 cylinder block. Step 5: The pressure of the Y-axis centering module is reduced to 0 MPa through the hydraulic control system and maintained at 0 MPa. Step 6: Clamp the three Z-axis positioning points. At this time, the V8 cylinder body is limited by the four X-axis positioning points and the two Y-axis positioning points in the positioning device and can only move up and down slightly. Under the action of the Z-axis clamping force, the V8 cylinder body is positioned and clamped in the Z-axis. Step 7: In this posture, the hydraulic control system clamps the workpiece in the X and Y directions; at this time, the midpoints of the X-direction positioning points X1 and X3 form a single-point positioning, the midpoints of the X-direction positioning points X2 and X4 form a single-point positioning, and the midpoints of the Y-direction positioning points Y1 and Y2 form a single-point positioning; the initial positioning of the V8 cylinder block is completed with three points in the Z direction, two points in the X direction, and one point in the Y direction, satisfying the six-point positioning principle.

4. The positioning method according to claim 3, characterized in that: When the V8 cylinder block is initially placed into the positioning device, the distance of the sliding stop is greater than the distance between the cylinder bores, and the V8 cylinder block cannot be positioned in the Z direction. At this time, the centering clamp module needs to pull the piston rod down in the oil cylinder to move the X-direction linkage module inward, so that the distance of the V8 cylinder block sliding stop gradually decreases and the X-direction positioning point gradually extends into the cylinder bore.

5. The positioning method according to claim 4, characterized in that: The three Z-axis positioning points Z1, Z2, and Z3 are at the same height. The height of the Z-axis auxiliary support positioning point Z4 is slightly lower than that of the Z-axis positioning points Z1, Z2, and Z3 by 0.3mm to prevent over-positioning of the four points on the plane and to avoid workpiece clamping errors caused by the deviation between the center of gravity of the cylinder and the center of gravity of the support.

6. The positioning method according to claim 5, characterized in that, The control method of the hydraulic control system is as follows: Action 1: The X-axis centering module positions the V8 cylinder body inward to ensure accurate X-axis positioning of the V8 cylinder body. After this, the pressure is reduced to 0 Mba and maintained at 0 Mba. When clamped in the Y-axis, the X-axis displacement of the V8 cylinder body is restricted by the X-axis positioning point. At this time, the V8 cylinder body can only move in the Y-axis direction. Action 2: The Y-axis positioning points Y1 and Y2 of the Y-axis centering positioning module are used to position the cylinder inward to ensure that the cylinder is accurately centered in the Y-axis direction. Then, the pressure of the Y-axis centering positioning module is reduced to 0 MPa and maintained at 0 MPa. When clamping in the Z-axis direction, the workpiece is restricted from moving along the Y-axis while the V8 cylinder moves slightly along the Z-axis. Action 3: The anti-vibration auxiliary support is in place, which strengthens the prevention of V8 cylinder block movement; Action 4: Press the cylinder body with the three Z-axis positioning points Z1, Z2, and Z3, and press the Z-axis auxiliary support positioning point Z4 after starting the Z-axis auxiliary support.

7. The positioning method according to claim 3, characterized in that, It also includes step 8: machining the bottom plane of the V8 cylinder block and machining two process pin holes on the bottom plane. All subsequent machining processes will use this one surface and two pins as the process positioning reference.

8. The positioning method according to claim 7, characterized in that: The positioning device aligns the cylinder liner with the center, ensuring that the cylinder liner has a consistent deviation from the center of the cylinder block. All subsequent machining processes are performed using the two pins on the bottom surface as positioning references. After machining, the cylinder liner has a uniform wall thickness and a positional accuracy of ≤0.5mm.

9. The positioning method according to claim 3, characterized in that: The step between step 5 and step 6 is: activate the anti-vibration auxiliary support; The step between step 6 and step 7 is: after starting the Z-axis auxiliary support, press the V8 cylinder block.

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