Engine cylinder bore precision boring fixture structure and engine cylinder bore precision boring method

Abstract

The invention discloses a fine boring fixture structure for an engine cylinder bore and a fine boring method for an engine cylinder bore. The fixture structure comprises a fixture body, which is used to clamp and fix a cylinder block. The fixture body is provided with a plurality of flow guide structures, which comprise a liquid collecting portion and a flow channel portion. The liquid collecting portion is provided at the inner end side of a cylinder bore of the cylinder block and is used to collect the spray liquid flowing out of the corresponding cylinder bore. The flow channel portion has a flow channel provided in the inner cavity of the cylinder block and is used to lead the liquid flow in the liquid collecting portion to the outside of the cylinder block. The spray liquid carrying the waste of boring pin powder flowing out of the cylinder bore is collected by the flow guide structure, and the spray liquid flow is led out of the cylinder block by using an independent flow channel provided in the inner cavity of the cylinder block, so that the waste such as the iron powder of the boring pin is directly led out after flowing out with the spray liquid in the cylinder bore, thereby reducing the contact between the waste and the inner cavity wall of the cylinder block, and effectively controlling the residue and accumulation of the waste of the boring pin on the joint surface of the upper cylinder block and the lower cylinder block and the uneven places of the inner cavity wall of the cylinder block.

Description

Technical Field

[0001] The invention relates to the technical field of engine cylinder hole processing, and in particular to an engine cylinder hole precision boring fixture structure and an engine cylinder hole precision boring method. Background Art

[0002] The function of the engine block is to serve as the assembly base for various mechanisms and systems of the engine, including the cylinder head, cylinder block and oil pan. Some engines divide the cylinder block into two parts, the upper part is called the cylinder block with cylinder holes, also called the upper cylinder block, and the lower part is a cavity structure for accommodating the crankshaft of the car, that is, the crankcase, also called the lower cylinder block. Since the crankshaft cavity of the lower cylinder block is connected to the cylinder hole of the upper cylinder block after the upper and lower cylinder blocks are combined, a transition cavity structure connecting the crankshaft cavity is also provided on the inner end side of the cylinder hole of the upper cylinder block. For the convenience of subsequent description, the transition cavity of the upper cylinder block, the crankshaft cavity of the lower cylinder block and the crankshaft cavity of the cylinder block are collectively referred to as the inner cavity of the corresponding structure.

[0003] For engine cylinder blocks that use a combination of an upper cylinder block and a lower cylinder block, the general process flow during the cylinder bore processing is rough boring, fine boring, and honing. The specific processing process is usually as follows: when rough boring the cylinder bore, fix the upper cylinder block separately for processing; when fine boring the cylinder bore, first combine the upper and lower cylinder blocks (i.e., the upper and lower cylinder blocks) and then perform boring pin processing on the machining center. When boring the pin cylinder bore, spraying is usually performed to cool down the tool and workpiece while taking away the waste materials of the boring pins, such as iron powder, to form a spray liquid flow mixed with iron powder. When flowing through the joint surface of the upper and lower cylinder blocks or the inner wall of the lower cylinder body, residue or even accumulation will occur.

[0004] Especially when fine boring the cylinder bore on a horizontal machining center, since the cylinder bore is horizontal, the impurities such as iron powder removed during the fine boring process will flow almost horizontally through the inner cavity wall of the lower cylinder body with the spray liquid flow. Due to the gravity sedimentation effect, it is very easy to produce residues and accumulation on the joint surface of the upper and lower cylinder bodies and the uneven inner cavity wall of the lower cylinder body. In addition, due to the sputtering of the spray flow caused by the tool during the boring process, impurities such as iron powder will also remain on the upper part of the cavity wall of the upper and lower cylinder bodies. These impurities are difficult to find and remove, affecting product quality. The existing removal method is: it is necessary to increase the manual disassembly of the upper cylinder body after the cylinder body is offline to remove the iron powder, which is time-consuming and labor-intensive, and brings huge production costs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an engine cylinder bore fine boring fixture structure and an engine cylinder bore fine boring method, which can effectively reduce the residual accumulation of boring pin waste on the inner cavity wall of the engine cylinder body.

[0006] In order to solve the above technical problems, the present invention provides an engine cylinder bore precision boring fixture structure, including a fixture body, wherein the fixture body is used to clamp and fix the cylinder block, and a plurality of flow guide structures are arranged on the fixture body, wherein the flow guide structure includes a liquid collecting portion and a flow channel portion. When precision boring the cylinder bore of the cylinder block, the fixture body clamps and fixes the cylinder block, and the liquid collecting portion is located on the inner end side of one of the cylinder bores, and is used to collect the spray liquid flowing out from the corresponding cylinder bore. The flow channel portion has a flow channel located in the inner cavity of the cylinder body, and is used to lead the liquid flow in the liquid collecting portion to the outside of the cylinder block.

[0007] In the above-mentioned engine cylinder bore fine boring fixture structure, when boring the cylinder bore of the cylinder block, the fixture body fixes the cylinder block, and a guide structure is set at the inner end of each cylinder bore, through which the spray liquid carrying the waste of boring pin powder flowing out of the cylinder bore is collected, and the spray liquid flow is guided out of the cylinder block by an independent flow channel set in the inner cavity of the cylinder body, so that the waste such as iron powder of the boring pin is directly guided out after flowing out with the spray liquid in the cylinder bore, reducing the contact between the waste and the inner cavity wall of the cylinder body, and effectively controlling the residue and accumulation of the waste of boring pin on the joint surface of the upper cylinder block and the lower cylinder block and the uneven places of the inner cavity wall of the cylinder body. The cylinder block is composed of an upper cylinder block and a lower cylinder block.

[0008] As an improvement of the engine cylinder bore fine boring fixture structure of the present invention, the clamping surface of the fixture body is arranged vertically to make the cylinder bore horizontal, and the guide structure includes a long guide groove, which extends from the inner cavity of the cylinder body to one side of the inner end of the cylinder bore, and the end is used to collect the spray liquid flowing out of the cylinder bore, and the groove body of the guide groove guides the liquid flow out of the cylinder body.

[0009] In the case of using a horizontal machining center for precision boring of cylinder bores, the cylinder bore is horizontal. During precision boring, the spray liquid flowing out of the cylinder bore is received by the extended end of the guide groove, and the liquid flows along the guide groove to the outside of the cylinder body at the other end. The entire guide structure is simple, and the spray liquid flow is strong during processing. Most of them flow out naturally in a certain parabola from the bottom end of the cylinder bore, and then flow into the end of the guide groove to complete the diversion. The structural design is ingenious and the diversion effect is good. Most of the boring pin waste can be guided out, reducing the residue and accumulation of boring pin waste such as iron powder. In addition, the groove structure of the guide groove also shields the bottom surface of the inner cavity of the cylinder body, effectively avoiding the residue of boring pin waste caused by sputtering.

[0010] In the above technical solution using the guide groove, a groove is provided at the inner bottom of the cylinder hole, and the bottom surface of the end groove of the guide groove extends into the groove. The end of the guide groove is extended into the inner bottom of the cylinder hole through the groove, and the spray liquid flowing out of the cylinder hole, whether it flows out in a parabolic shape or flows down along the inner end surface of the cylinder hole, will be collected by the end of the guide groove. The end of the guide groove can collect more spray liquid, and the collection effect is good, which further reduces the contact between the spray liquid and the inner wall of the cylinder body, and reduces the residual and accumulation of waste.

[0011] In the above technical solution using the guide groove, a flexible block is arranged on the end surface of the guide groove, and when guiding, the flexible block is in close contact with the inner wall of the cylinder body and is in a compressed state. Preferably, the guide groove is made of nylon material, and the flexible block is made of soft silicone material.

[0012] By setting the flexible block, when working, after the guide groove extends into the inner cavity of the cylinder body, it will squeeze the flexible block with the inner wall to eliminate the gap. On the one hand, the two are in flexible contact to avoid bumps and scratches. On the other hand, it also blocks the flow path of the spray liquid along the cavity wall at the end face of the cylinder hole, and almost all the spray liquid is collected in the guide groove, further reducing the residue and accumulation of boring pin waste.

[0013] In the above technical solution using the guide groove, a contour block is also provided on the top of each guide structure, and the contour block is used to block the inner cavity top surface of the cylinder body from bottom to top. Preferably, the contour block is made of nylon material.

[0014] A contour block is provided for each cylinder hole. The shielding effect of the contour block structure effectively blocks the spray liquid flow or the waste boring pin from splashing onto the top surface of the inner cavity of the cylinder body, further reducing the residual and accumulation of the waste boring pin on the inner cavity wall of the cylinder body. In addition, the waste and waste liquid dripping from the bottom surface of the contour block directly fall into the guide groove and will flow out of the cylinder body with the main spray liquid. Preferably, the width of the contour block is smaller than the width of the guide groove.

[0015] In the above technical solution using the guide groove, a spray ball head is provided at the bottom of the guide groove, and the spray ball head is used to perform fixed-point spraying on the inner cavity wall of the cylinder body.

[0016] The spray ball head is used to carry out targeted spraying at the position on the inner cavity wall where the boring pin waste is likely to remain, so as to reduce the accumulation of the boring pin waste in a targeted manner, and directly clean up and take away the boring pin waste in the area prone to remain and accumulate. In addition, the spray ball head is fixed on the guide groove in a flexible position and can be set as needed. The spray direction can also be adjusted, so that the targeted spraying effect is better and the practicability is strong.

[0017] As another improvement of the engine cylinder bore fine boring fixture structure of the present invention, the clamping surface of the fixture body is arranged horizontally to make the cylinder bore vertical, and the flow guide structure includes a funnel-shaped collector, the funnel mouth of the collector extends into one side of the inner end of the cylinder bore, and is used to collect the spray liquid flow flowing out of the cylinder bore, and the tube body of the collector guides the liquid flow out of the lower cylinder body.

[0018] In the case of using a vertical machining center for fine boring of cylinder holes, the cylinder holes are vertical. During fine boring, the spray liquid flowing out of the cylinder holes is received by the funnel mouth of the collector, and the liquid flows along the tube body at the bottom of the funnel mouth to the outside of the lower cylinder body. The entire diversion structure is simple, and due to the support of gravity, the diversion effect is good and smoother, and most of the boring pin waste can be directly discharged.

[0019] In order to solve the above technical problems, the present invention provides an engine cylinder bore fine boring method based on the above engine cylinder bore fine boring fixture structure, comprising the following steps:

[0020] The cylinder hole is precision bored, the outflowing spray liquid is collected at the inner end of the cylinder hole, and an independent flow channel is set to guide the collected spray liquid to the outside of the cylinder body.

[0021] In the above-mentioned engine cylinder bore precision boring method, the cylinder block is composed of an upper cylinder block and a lower cylinder block. After the cylinder block is supported and fixed, during precision boring, the spray liquid carrying the boring pin powder waste flowing out of the cylinder bore is collected and guided out of the cylinder block through an independent flow channel, thereby reducing the contact between the waste and the inner cavity wall of the upper cylinder block or the lower cylinder block, and effectively controlling the residue and accumulation of the boring pin waste on the joint surface of the upper and lower cylinder blocks, the uneven parts of the inner cavity wall, and the like.

[0022] Furthermore, when fine boring the horizontal cylinder bore, the top surface of the inner cavity of the cylinder body is shielded to prevent the spraying liquid flow or the boring pin waste from splashing onto the inner cavity top surface of the cylinder body, thereby further reducing the residual and accumulation of the boring pin waste on the inner cavity wall of the cylinder body.

[0023] In summary, the engine cylinder bore fine boring fixture structure and the engine cylinder bore fine boring method are used to remove the waste boring pins on the inner wall of the cylinder body by combining the shielding of the profiling block, the flushing of the spray ball head and the drainage of the guide structure, especially the iron powder and other impurities on the joint surface of the upper and lower cylinder bodies. The removal effect is obvious, and the residual and accumulation of iron powder impurities are effectively reduced, and the cover opening treatment is avoided after the processing is completed in the later stage, which greatly reduces the labor cost. In addition, these measures are implemented simultaneously without affecting the processing quality and increasing the processing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In the attached picture:

[0025] Figure 1 This is a structural diagram of the clamp body clamping and fixing the upper cylinder body and the lower cylinder body combination.

[0026] Figure 2 This is a structural diagram of the clamp body that clamps and fixes the lower cylinder.

[0027] Figure 3 This is the structural diagram of the fixture body.

[0028] Figure 4 for Figure 1 A partial cross-sectional view of .

[0029] Figure 5 for Figure 4 A partial enlarged view of .

[0030] Figure 6 This is the structural diagram of the contour block.

[0031] Figure 7 This is the structural diagram of the diversion trough.

[0032] Figure 8 This is the fixing structure diagram of the guide groove and the spray ball head.

[0033] Fig. 9 This is a disassembled diagram of the guide groove and the spray ball head fixing structure.

[0034] Fig.10 Schematic diagram of the current collector structure.

[0035] In the figure, 1, fixture body; 2, upper cylinder body; 3, lower cylinder body; 41, guide groove; 411, flexible block; 412, vertical baffle; 413, positioning block; 414, bracket block; 42, collector; 5, cylinder hole; 51, groove; 6, contour block; 61, protrusion; 7, spray ball head. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0037] Figure 1-10 The present invention shows a precision boring fixture structure for an engine cylinder bore. Figure 1-4 and Fig.10 As shown, the engine cylinder bore precision boring fixture structure includes a fixture body 1, which is used to clamp and fix the cylinder block. The fixture body 1 is provided with a plurality of flow guide structures, which include a liquid collecting portion and a flow channel portion. When precision boring the cylinder bore 5 of the cylinder block, the fixture body 1 clamps and fixes the cylinder block. The liquid collecting portion is located at the inner end side of a cylinder bore 5, and is used to collect the spray liquid flowing out of the corresponding cylinder bore 5. The flow channel portion has a flow channel located in the inner cavity of the cylinder body, and is used to lead the liquid flow in the liquid collecting portion to the outside of the cylinder block.

[0038] During use, when precision boring the cylinder hole 5, the spray mechanism of the boring tool will continuously spray the processing area, forming a spray liquid flow carrying boring pin powder waste at the bottom of the cylinder hole 5, and a part of the liquid flow flows along the cylinder hole 5 to the inner end, is collected by the corresponding guide structure, and the spray liquid flow is guided out of the cylinder body by an independent flow channel arranged in the inner cavity of the cylinder body. A guide structure is arranged at the inner end of each cylinder hole 5, so that the iron powder and other waste materials of the boring pin can be directly guided out after flowing out of the cylinder hole 5 with the spray liquid, thereby reducing the contact between the waste materials and the inner cavity wall of the cylinder body, and effectively controlling the residue and accumulation of the boring pin waste materials at the joint surface of the upper cylinder body 2 and the lower cylinder body 3 and the uneven parts of the inner cavity wall of the cylinder body.

[0039] like Figure 3 and Figure 4 As shown, the clamping surface of the clamp body 1 is arranged vertically to make the cylinder hole 5 horizontal. The guide structure includes a long guide groove 41. The guide groove 41 extends from the inner cavity of the cylinder body to the inner end of the cylinder hole 5, and the end is used to collect the spray liquid flowing out of the cylinder hole 5. The groove body of the guide groove 41 guides the liquid flow out of the cylinder body.

[0040] In the case of using a horizontal machining center to perform precision boring of the cylinder bore 5, the cylinder bore 5 is horizontal. During precision boring, the extended end of the guide groove 41 receives the spray liquid flow from the cylinder bore 5, and the liquid flows along the guide groove 41 to the outside of the cylinder body at the other end. The entire guide structure is simple, and the spray liquid flow is strong during processing. Most of it flows out naturally in a certain parabola from the bottom end of the cylinder bore 5, and then flows into the end of the guide groove 41 to complete the guide. The structural design is ingenious and the guide effect is good. Most of the boring pin waste can be guided out, reducing the residue and accumulation of boring pin waste such as iron powder. In addition, the groove structure of the guide groove 41 also blocks the inner cavity bottom surface of the cylinder body, effectively avoiding the residue of boring pin waste caused by sputtering.

[0041] In order to guide the flow better, the bottom surface of the guide groove 41 is arranged obliquely to accelerate the flow of liquid to the outside of the cylinder body, and the bottom surface of the extending end of the guide groove 41 is lower than the cylinder hole 5.

[0042] In addition, the width of the guide groove 41 is a constant value and is smaller than the minimum width of the corresponding inner cavity of the cylinder body by 2-3 mm, so that the guide groove 41 can penetrate into the inner cavity of the cylinder body and has a good shielding effect on the lower part of the inner cavity of the cylinder body.

[0043] like Figure 7 and Fig. 9 As shown, the guide groove 41 is fixed at one end of the fixture body 1 and is provided with a notch to allow the liquid to flow out. Specifically, two side plates of a certain width are removed from the fixed end of the guide groove 41. Optionally, a vertical baffle 412 is provided on the side plate at the notch to limit the guided water flow to flow out between the surface of the fixture body 1 and the vertical baffle 412, further reducing the impact on the inner wall of the cylinder body.

[0044] like Figure 5 As shown, a groove 51 is provided at the inner bottom of the cylinder hole 5 , and the end groove bottom surface of the guide groove 41 extends into the groove 51 .

[0045] During operation, the end of the guide groove 41 extends into the inner bottom of the cylinder hole 5. The spray liquid flowing out of the cylinder hole 5, whether it flows out in a parabolic shape or flows down along the inner end surface of the cylinder hole 5, will be collected by the end of the guide groove 41. The end of the guide groove 41 can collect more spray liquid, and the collection effect is good, which further reduces the contact between the spray liquid and the inner wall of the cylinder body, and reduces waste residue and accumulation.

[0046] like Figure 7 As shown, a flexible block 411 is provided on the end surface of the guide groove 41. When guiding the flow, the flexible block 411 is closely attached to the inner wall of the cylinder body and is in an elastically compressed state.

[0047] During operation, after the guide groove 41 extends into the inner cavity of the cylinder body, it will squeeze the flexible block 411 with the inner wall groove 51 to eliminate the gap. On the one hand, it makes the two contact flexibly to avoid bumps and scratches. On the other hand, it also blocks the flow path of the spray liquid along the cavity wall at the end face of the cylinder hole 5, and collects almost all of the spray liquid into the guide groove 41, further reducing the residue and accumulation of boring pin waste.

[0048] In addition, during the fine boring process, the boring tool will move a certain distance beyond the depth of the cylinder hole 5. Although the bottom surface of the guide groove 41 is lower than the cylinder hole 5, in order to ensure that the guide groove 41 does not interfere with the boring tool, a chamfer structure is provided on the side surface of the end of the guide groove 41 to avoid interference.

[0049] Optionally, the flexible block 411 supports the same groove structure as the main body of the guide groove 41, which is arranged on the end face of the main body, with a width of 2-5 mm, and is cleverly designed and can be fixed by bonding. In addition, the guide groove 41 is made of nylon material, and the flexible block 411 is made of silicone material. The nylon material as a whole has good toughness and certain elasticity to prevent collision with the cylinder body, and the silicone material is soft silicone with soft elasticity, which can recover after extrusion deformation.

[0050] like Figure 2-5 As shown, a contoured stopper 6 is also provided on the top of each guide structure, and the contoured stopper 6 is used to shield the inner cavity top surface of the cylinder body from bottom to top. The shielding effect of the contoured stopper 6 structure effectively prevents the spraying liquid flow or boring pin waste from splashing onto the inner cavity top surface of the cylinder body, further reducing the residual and accumulation of boring pin waste on the inner cavity wall of the cylinder body.

[0051] Optionally, the bottom surface of the contoured stopper 6 is not lower than the cylinder hole 5, thereby providing shielding and avoiding interference with the boring tool.

[0052] like Figure 6As shown, the main body of the profiling block 6 is in the shape of a long block, one end of which is fixed on the fixture main body 1, and the other end of which extends into the inner cavity of the cylinder body. The bottom of the end surface of the profiling block 6 extends outward to form a convex block 61, and the end of the convex block 61 extends into one side of the inner end of the cylinder hole 5. A notch structure is formed at the end of the profiling block 6 to match the inner wall structure of the connecting cavity at the inner end of the cylinder hole 5. Usually, the design gap between the end surface of the convex block 61 and the inner end surface of the cylinder hole 5 is 0.02mm, that is, almost in contact, and the width is also a fixed value, which is 2-3mm narrower than the inner cavity of the cylinder body at the corresponding position, ensuring a good shielding effect and being able to be smoothly inserted into the inner cavity of the cylinder body.

[0053] Optionally, the top surface of the protrusion 61 is an inclined surface, and the side close to the cylinder hole 5 is lower, the top surface of the contour stopper 6 is a contour surface adapted to the corresponding cavity wall, and the square stopper 6 is vertically fixed on the surface of the clamp body 1 for easy insertion. The contour stopper 6 is made of nylon material to avoid bumping the cylinder body.

[0054] like Figure 3 and Figure 8 As shown, a spray ball head 7 is provided at the bottom of the guide groove 41, and the spray ball head 7 is used to spray the inner wall of the cylinder body at a fixed point. The spray ball head 7 sprays at a fixed point on the position where the boring pin waste is likely to remain on the inner wall, specifically reducing the accumulation of the boring pin waste, directly cleaning away the boring pin waste in the area that is likely to remain and accumulate, and the spray ball head 7 is fixed on the guide groove 41 flexibly, and can be set as needed, and the spray direction can also be adjusted, so that the targeted spraying effect is better and the practicability is strong.

[0055] like Figure 8 and Fig. 9 As shown, the guide groove 41 and the spray ball head 7 are fixed to the fixture body 1. First, a positioning block 413 is fixed to the surface of the fixture body 1 by bolts, and the bracket block 414 of the spray ball head 7 is fixed to the top surface of the positioning block 413. Then, the fixed end of the guide groove 41 is fixed to the bracket block 414, and the vertical baffle 412 is fixed to both sides of the positioning block 413.

[0056] like Fig.10 As shown, the clamping surface of the clamp body 1 is arranged horizontally to make the cylinder hole 5 vertical. The flow guide structure includes a funnel-shaped collector 42. The funnel mouth of the collector 42 extends into one side of the inner end of the cylinder hole 5 to collect the spray liquid flow flowing out of the cylinder hole 5. The tube body of the collector 42 guides the liquid flow out of the lower cylinder body 3.

[0057] In the case of using a vertical machining center to perform precision boring of the cylinder hole 5, the cylinder hole 5 is vertical. During precision boring, the spray liquid flow from the cylinder hole 5 is received by the funnel mouth of the collector 42, and the liquid flow flows along the tube body at the bottom of the funnel mouth to the outside of the lower cylinder body 3. The entire diversion structure is simple, and due to the support of gravity, the diversion effect is good and smoother, and most of the boring pin waste can be directly discharged.

[0058] The present invention provides an engine cylinder bore fine boring method based on the above-mentioned engine cylinder bore fine boring fixture structure, comprising the following steps:

[0059] The cylinder hole is precision bored, the outflowing spray liquid is collected at the inner end of the cylinder hole, and an independent flow channel is set to guide the collected spray liquid to the outside of the cylinder body.

[0060] When in use, it is described with the cylinder bore level. First, the contour block is designed according to the three-dimensional model of the cylinder body, and the mold is manufactured and fixed to the fixture body; then, according to the clamping posture of the cylinder body, the guide groove is designed and installed. The groove body adopts a slope design to guide the spray liquid flow to the outside of the cylinder body. Interference needs to be avoided during the design process; then, according to the posture of the cylinder body in the machining center, the points where the boring pin waste is easy to remain are analyzed, generally in the concave part of the inner wall of the cylinder body, and the spray ball head is arranged according to the points where the iron powder is easy to remain. The spray ball head is connected to the spray pipeline inside the equipment, and the spray angle can be adjusted; finally, the cylinder body is clamped, the cylinder hole is finely bored, and the spraying is continued. After the processing is completed, remove the engine cylinder block.

[0061] The beneficial effects of this method are as follows: the present invention utilizes the design of the horizontal machining center fixture and creatively proposes to add a cylinder bore profiling block, a spray ball head port, and an internal boring pin waste guide groove. From the upper and lower cylinder bodies combined with the fixed posture, the position where the boring pin waste is likely to remain is identified, and a profiling block is set inside to specifically reduce the spattering residue of the boring pin waste, and an internal liquid flow guide plate is added to guide it away using an independent flow channel, while the residual boring pin waste at a specific point is taken away by a spray ball head in a targeted manner. In this way, starting from the source of the boring pin waste and the removal of the boring pin waste, the residual and accumulation of the boring pin waste can be effectively reduced without increasing the single-station cycle, saving time and effort.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. An engine cylinder bore fine boring fixture structure, characterized in that: The clamp body (1) comprises a clamp body (1) for clamping and fixing a cylinder block, the clamp body (1) being provided with a plurality of flow guiding structures, the flow guiding structures comprising a liquid collecting portion and a flow channel portion, when precision boring a cylinder hole (5) of a cylinder block, the clamp body (1) clamps and fixes the cylinder block, the liquid collecting portion being located at an inner end side portion of one of the cylinder holes (5) and being used to collect spray liquid flowing out of the corresponding cylinder hole (5), the flow channel portion having a flow channel located in an inner cavity of the cylinder block and being used to guide the liquid flow in the liquid collecting portion to the outside of the cylinder block; A contoured stopper (6) is also provided on the top of each of the flow-guiding structures, and the contoured stopper (6) is used to shield the inner cavity top surface of the cylinder body from bottom to top.

2. The engine cylinder bore precision boring fixture structure according to claim 1, characterized in that: The clamping surface of the clamp body (1) is arranged vertically so that the cylinder hole (5) is horizontal. The guide structure comprises a long guide groove (41). The guide groove (41) extends from the inner cavity of the cylinder body to one side of the inner end of the cylinder hole (5), and the end is used to collect the spray liquid flowing out of the cylinder hole (5). The groove body of the guide groove (41) guides the liquid flow out of the cylinder body.

3. According to the structure of the fine boring fixture for engine cylinder bores as claimed in claim 2, the bottom surface of the guide groove (41) is arranged obliquely to accelerate the flow of liquid to the outside of the cylinder body, and the bottom surface of the extending end of the guide groove (41) is lower than the cylinder bore (5), and a notch is provided at one end of the guide groove (41) fixed to the fixture body (1) to allow the liquid to flow out.

4. The engine cylinder bore fine boring fixture structure according to claim 2, wherein a groove (51) is provided at the inner bottom of the cylinder bore (5), and the end groove bottom surface of the guide groove (41) extends into the groove (51).

5. An engine cylinder bore precision boring fixture structure according to any one of claims 2 to 4, characterized in that: A flexible block (411) is provided on the end surface of the guide groove (41); when guiding flow, the flexible block (411) is in close contact with the inner cavity wall of the cylinder body and is in an elastically compressed state.

6. The engine cylinder bore precision boring fixture structure according to claim 1, characterized in that: The main body of the profiling block (6) is in the form of a long block structure, one end of which is fixed to the clamp main body (1) and the other end of which extends into the inner cavity of the cylinder body. The bottom of the end surface of the extending end of the profiling block (6) extends outward to form a protrusion (61), and the end of the protrusion (61) extends into one side of the inner end of the cylinder hole (5), and the bottom surface of the profiling block (6) is not lower than the cylinder hole (5).

7. The engine cylinder bore precision boring fixture structure according to claim 6, characterized in that: The top surface of the protrusion (61) is an inclined surface, and the side close to the cylinder hole (5) is lower. The top surface of the contour stopper (6) is a contoured surface adapted to the corresponding cavity wall. The contour stopper (6) is made of a flexible material.

8. The engine cylinder bore precision boring fixture structure according to claim 2, characterized in that: A spray ball head (7) is provided at the bottom of the guide groove (41), and the spray ball head (7) is used to spray the inner wall of the cylinder body at a fixed point.

9. A method for fine boring of an engine cylinder bore based on the engine cylinder bore fine boring fixture structure according to any one of claims 1 to 8, characterized in that: include: When precision boring the cylinder bore, the outflowing spray liquid is collected at the inner end of the cylinder bore, and an independent flow channel is provided to guide the collected spray liquid to the outside of the cylinder body.

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