Machining tool for machining inner hole of valve guide sleeve and operation method of machining tool

Abstract

The invention discloses a machining tool for machining an inner hole of a valve guide sleeve. The machining tool comprises a connecting plate, and the connecting plate is fixedly installed at the center position of a machine tool workbench through a bolt by means of key groove positioning; and the valve guide sleeve lower end positioning structure is used for effectively positioning the lower end of the valve guide sleeve needing to be subjected to inner hole accurate grinding machining, the valve guide sleeve lower end positioning structure is arranged at the center position of the connecting plate, and the axis of the valve guide sleeve lower end positioning structure coincides with the axis of the machine tool spindle. Certain free adjustment space is provided for the honing tool in the machining process, the situation that the tool is damaged and blocked due to uneven stress in the honing process is avoided, the machining efficiency of the inner diameter of the valve guide sleeve is effectively improved, the machining precision of the inner hole of the valve guide sleeve is further improved, and the machining efficiency of the inner hole of the valve guide sleeve is improved. And great convenience is brought to the accurate grinding work of the inner diameter of the valve guide sleeve.

Description

Technical Field

[0001] The invention relates to the technical field of fine grinding of the inner hole of a valve guide sleeve, and in particular to a processing tool for processing the inner hole of a valve guide sleeve and an operating method thereof. Background Art

[0002] The valve guide sleeve is an important part of the cylinder head unit of a medium-speed engine. As the guide sleeve for the movement of the intake and exhaust valves, it requires high quality and high geometric tolerances. Figure 1 As shown, the straightness, roughness and dimensional tolerance of the inner hole are relatively high, and generally multiple processing steps are required to form the inner hole.

[0003] At present, when the inner hole of the valve guide sleeve is processed accordingly, a honing machine is usually selected to perform fine grinding on the inner hole surface. When fine grinding the inner hole surface, the valve guide sleeve fixing clamp needs to be mounted on the machine tool workbench first, and then the honing tool of the honing machine is started to perform fine grinding on it. However, the honing machine spindle has no universal head, and the honing tool cannot adjust its position following the inner hole of the valve guide sleeve during the processing. The use of this clamping processing method not only reduces the processing efficiency of the valve guide sleeve, but also reduces the processing accuracy of the inner hole of the valve guide sleeve.

[0004] In addition, if this processing method is used, if the calibration is inaccurate or the original bottom hole straightness is poor, the honing tool of the honing machine will cause great wear and tear, and in severe cases, the tool may even get stuck, which brings great inconvenience to the fine grinding of the inner diameter of the valve guide sleeve. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a processing tool and an operating method for processing the inner hole of a valve guide sleeve. The processing tool and the operating method have a reasonable overall design, a simple structure, and are easy to operate. When the inner hole of the valve guide sleeve is fine-ground, the valve guide sleeve is not completely locked, and a certain amount of free adjustment space is given to it during the processing, thereby avoiding damage and jamming of the tool caused by uneven force on the tool during honing. Not only does it effectively improve the processing efficiency of the inner diameter of the valve guide sleeve, but it also improves the processing accuracy of the inner hole of the valve guide sleeve, which brings great convenience to the fine grinding of the inner diameter of the valve guide sleeve.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A processing tool for processing the inner hole of a valve guide sleeve, characterized in that it includes

[0008] A connecting plate, which is fixedly mounted at the center of the machine tool table by bolts using key slots for positioning;

[0009] A valve guide sleeve lower end positioning structure for effectively positioning the lower end of the valve guide sleeve that needs to undergo inner hole fine grinding, wherein the valve guide sleeve lower end positioning structure is arranged at the center of the connecting plate, and its axis coincides with the axis of the machine tool spindle;

[0010] A valve guide sleeve upper end positioning structure is used to effectively position the upper end of a valve guide sleeve that requires inner hole fine grinding. The valve guide sleeve upper end positioning structure is arranged on a connecting plate through a supporting structure, and its axis coincides with the axis of the valve guide sleeve lower end positioning structure.

[0011] In a preferred embodiment of the present invention, the valve guide sleeve lower end positioning structure comprises:

[0012] A base, which is fixed and installed at the center of the connecting plate by bolts;

[0013] A limit seat, lugs are symmetrically arranged on both sides of the limit seat, a plurality of fixing holes are arranged on the lugs at intervals along the length direction thereof, bolts are selected to pass through the fixing holes to fix the lugs at the upper end of the base, a positioning hole is arranged at the center position of the upper end of the limit seat, the axis of the positioning hole coincides with the axis of the machine tool spindle, and a fine grinding clearance hole is also arranged at the center position of the limit seat, the inner diameter of the fine grinding clearance hole is smaller than the inner diameter of the positioning hole and larger than the outer diameter of the fine grinding tool, and the axis thereof coincides with the axis of the positioning hole;

[0014] A positioning ring is used to effectively position the lower end of a valve guide sleeve that needs inner hole fine grinding. The positioning ring is fixedly installed in the positioning hole. The inner diameter of the positioning ring is larger than the outer diameter of the valve guide sleeve, and its axis coincides with the axis of the positioning hole.

[0015] In a preferred embodiment of the present invention, the supporting structure includes an upper top plate, support rods for fixing the upper top plate to a connecting plate are symmetrically provided on both sides of the upper top plate, the lower ends of the support rods are provided on the connecting plate, and the upper ends of the support rods are fixed to U-shaped fixing grooves symmetrically provided on both sides of the upper top plate by nuts, and a threaded hole is provided at the center position of the upper top plate, and the axis of the threaded hole coincides with the axis of the machine tool spindle.

[0016] In a preferred embodiment of the present invention, the valve guide sleeve upper end positioning structure includes a threaded positioning sleeve for effectively positioning the upper end of the valve guide sleeve that requires inner hole fine grinding processing, and an external thread matching the threaded hole is provided in the middle of the outer circumferential surface of the threaded fixing sleeve, and the inner hole of the threaded positioning sleeve is divided into an upper end positioning hole and a fine grinding through hole, and the fine grinding through hole is arranged on the upper side of the upper end positioning hole and is coaxial with it, the axis of the upper end positioning hole coincides with the axis of the threaded hole, and the inner diameter of the upper end positioning hole is larger than the outer diameter of the upper end of the valve guide sleeve.

[0017] In a preferred embodiment of the present invention, the processing tooling for processing the inner hole of the valve guide sleeve also includes a clamping assembly that can effectively fix the valve guide sleeve to prevent it from rotating during the fine grinding process. The clamping assembly is clamped at the middle position of the outer peripheral surface of the valve guide sleeve that needs to undergo inner hole fine grinding. The clamping assembly is fixedly arranged on the positioning structure at the lower end of the valve guide sleeve by a limiting bolt.

[0018] An operating method of a processing tool for processing an inner hole of a valve guide sleeve, characterized in that it comprises the following steps:

[0019] Step 1: The operator cleans the outer surface and inner hole of the valve guide sleeve and performs size inspection;

[0020] The second step: clamping the valve guide sleeve that has been cleaned and passed the size inspection, and clamping the clamping assembly in the middle of the outer surface of the valve guide sleeve;

[0021] Step 3: Remove the threaded positioning sleeve, vertically install the lower end of the valve guide sleeve into the positioning ring, and then install the threaded limit sleeve to position its upper end, ensuring that the upper and lower outer circles of the valve guide sleeve are all positioned in the tooling;

[0022] Step 4: After positioning the upper and lower ends of the valve guide sleeve, the operator manually moves the honing tool down to set the up and down movement position of the tool, where L is the actual movement stroke of the honing tool rod;

[0023] Step 6: After the relevant parameters of the honing tool are set, close the equipment door, run the honing program, and hone the inner hole of the valve guide sleeve;

[0024] Step 7: After the program is completed, the operator opens the door, removes the threaded limit sleeve, takes out the valve guide sleeve, removes the clamping assembly, measures the inner hole size, cleans the valve guide sleeve and tooling, and applies oil to prevent rust.

[0025] In a preferred embodiment of the present invention, the cleaning in the first step is to clean the cutting fluid and iron filings remaining on its surface; the size inspection is to re-check whether the outer circle and inner hole dimensions meet the original process size requirements, confirm that there are no flanging burrs on the lower reference surface, and clean the tooling reference surface.

[0026] In a preferred embodiment of the present invention, the sandpaper in the clamping assembly in the second step fits against the outer surface of the valve guide sleeve to generate a certain friction force.

[0027] Compared with the prior art, the present invention has a reasonable overall design, simple structure and easy operation. When the inner hole of the valve guide sleeve is finely ground, the valve guide sleeve is not completely locked, and a certain amount of free adjustment space is given to it during the processing, thereby avoiding damage and jamming of the tool caused by uneven force on the tool during honing. It not only effectively improves the processing efficiency of the inner diameter of the valve guide sleeve, but also improves the processing accuracy of the inner hole of the valve guide sleeve, which brings great convenience to the fine grinding of the inner diameter of the valve guide sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of an existing valve guide sleeve.

[0030] Figure 2 It is a schematic diagram of the structure of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of the clamping valve guide sleeve of the present invention.

[0032] Figure 4 This is a schematic structural diagram of the fine grinding tool of the present invention before fine grinding.

[0033] Figure 5 It is a schematic diagram of the structure after the fine grinding tool of the present invention is inserted into the inner hole of the valve guide sleeve.

[0034] Figure 6 It is a schematic structural diagram of the fine grinding process of the fine grinding tool of the present invention.

[0035] Figure 7 It is a schematic structural diagram of the limit seat of the present invention.

[0036] Figure 8 It is a schematic structural diagram of the positioning ring of the present invention.

[0037] Fig. 9 It is a schematic structural diagram of the upper top plate of the present invention.

[0038] Fig.10 It is a structural schematic diagram of the threaded positioning sleeve of the present invention.

[0039] Fig.11 It is a schematic diagram of the structure of the clamping assembly of the present invention clamped on the valve guide sleeve. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0041] Reference Figure 2-Figure 11 As shown, a processing tool for processing the inner hole of the valve guide sleeve is shown, including a connecting plate 100, a valve guide sleeve lower end positioning structure 200 and a valve guide sleeve upper end positioning structure 300.

[0042] The connecting plate 100 is positioned by a keyway and fixedly installed at the center of the machine tool worktable 700 using bolts. The valve guide sleeve lower end positioning structure 200 is used to effectively position the lower end of the valve guide sleeve 1300 that requires inner hole fine grinding. The valve guide sleeve lower end positioning structure 200 is arranged at the center of the connecting plate 100, and its axis coincides with the axis of the machine tool spindle.

[0043] The valve guide sleeve upper end positioning structure 300 is used to effectively position the upper end of the valve guide sleeve 1300 that requires inner hole fine grinding. The valve guide sleeve upper end positioning structure 300 is set on the connecting plate 100 through the support structure 400, and the axis coincides with the axis of the valve guide sleeve lower end positioning structure 200.

[0044] The valve guide sleeve lower end positioning structure 200 includes a base 210 , a limit seat 220 and a positioning ring 230 . The base 210 is fixedly installed at the center of the connecting plate 100 by bolts 1200 .

[0045] The base 210 is a replaceable part, which is welded to reduce weight and production cost, and is mounted on the connecting plate by pin holes and bolts, which can ensure that the repeated positioning is less than 0.05mm. The base can be replaced according to the length of the part.

[0046] Lugs 221 are symmetrically provided on both sides of the limit seat 220, and a plurality of fixing holes are spaced apart along the length direction of the lugs 221. Bolts 1000 are selected to pass through the fixing holes to fix the lugs at the upper end of the base 210. A positioning hole 222 is provided at the center position of the upper end of the limit seat 220, and the axis of the positioning hole 222 coincides with the axis of the machine tool spindle.

[0047] A fine grinding clearance hole 223 is also opened at the center of the limiting seat 220 . The inner diameter of the fine grinding clearance hole 223 is smaller than the inner diameter of the positioning hole 222 and larger than the outer diameter of the fine grinding tool 1400 , and its axis coincides with the axis of the positioning hole 222 .

[0048] The positioning ring 230 is used to effectively position the lower end of the valve guide sleeve that needs inner hole fine grinding. The positioning ring 230 is fixedly installed in the positioning hole. The inner diameter of the positioning ring 230 is larger than the outer diameter of the valve guide sleeve 1300, and its axis coincides with the axis of the positioning hole.

[0049] The limit seat 220 is positioned by two diagonal positioning pin holes 1100 to ensure that the repeated installation error is less than 0.05mm. The center position of the limit seat is a replaceable positioning ring, whose outer diameter is the matching size of the inner hole, and the single-side clearance is less than 0.02mm. The inner diameter can be adjusted according to the outer diameter of the valve guide sleeve installation position to ensure that the single-side clearance is between 0.5-1mm, and it is tightened by the end face hexagon socket bolt.

[0050] The support structure 400 includes an upper top plate 410, and support rods 420 for fixing it to the connecting plate 100 are symmetrically arranged on both sides of the upper top plate 410. The lower end of the support rod 420 is arranged on the connecting plate 100, and the upper end of the support rod 420 is fixed to the U-shaped fixing groove 411 symmetrically opened on both sides of the upper top plate 410 through a nut 00. A threaded hole 412 is opened at the center position of the upper top plate 410, and the axis of the threaded hole 412 coincides with the axis of the machine tool spindle.

[0051] The valve guide sleeve upper end positioning structure 300 includes a threaded positioning sleeve 310 for effectively positioning the upper end of the valve guide sleeve that needs to undergo inner hole fine grinding.

[0052] An external thread matching the threaded hole 412 is provided in the middle of the outer circumference of the threaded fixing sleeve 310, and the inner hole of the threaded positioning sleeve 310 is divided into an upper end positioning hole 312 and a finely ground through hole 311. The finely ground through hole 311 is arranged on the upper side of the upper end positioning hole 312 and is coaxial with it. The axis of the upper end positioning hole 312 coincides with the axis of the threaded hole.

[0053] The inner diameter of the upper end positioning hole 312 is larger than the outer diameter of the upper end of the valve guide sleeve. The size of the upper end positioning hole of the threaded positioning sleeve 310 can be adjusted according to the size of the part to ensure that the single-side clearance is between 0.5-1mm.

[0054] The processing tooling for processing the inner hole of the valve guide sleeve also includes a clamping assembly 500 that can effectively fix the valve guide sleeve to prevent it from rotating during the fine grinding process. The clamping assembly 500 is clamped at the middle position of the outer circumference of the valve guide sleeve 1300 that needs to undergo inner hole fine grinding. The clamping assembly 500 is fixedly arranged on the positioning structure 200 at the lower end of the valve guide sleeve by a limiting bolt 600.

[0055] An operating method of a processing tool for processing an inner hole of a valve guide sleeve comprises the following steps:

[0056] Step 1: The operator cleans the outer surface and inner hole of the valve guide sleeve and performs dimensional inspection, cleans the cutting fluid and iron filings remaining on the surface; rechecks whether the outer circle and inner hole dimensions meet the original process dimension requirements, confirms that there are no flanging burrs on the lower reference surface, and cleans the tooling reference surface;

[0057] Step 2: Clamp the valve guide sleeve that has been cleaned and passed the size inspection, and clamp the clamping assembly in the middle of the outer surface of the valve guide sleeve to ensure that the sandpaper in the clamping assembly fits the outer surface of the valve guide sleeve to generate a certain friction force;

[0058] Step 3: Remove the threaded positioning sleeve, vertically install the lower end of the valve guide sleeve into the positioning ring, and then install the threaded limit sleeve to position its upper end, ensuring that the upper and lower outer circles of the valve guide sleeve are all positioned in the tooling;

[0059] Step 4: After positioning the upper and lower ends of the valve guide sleeve, the operator manually moves the honing tool down to set the up and down movement position of the tool, where L is the actual movement stroke of the honing tool rod;

[0060] Step 6: After the relevant parameters of the honing tool are set, close the equipment door, run the honing program, and hone the inner hole of the valve guide sleeve;

[0061] Step 7: After the program is completed, the operator opens the door, removes the threaded limit sleeve, takes out the valve guide sleeve, removes the clamping assembly, measures the inner hole size, cleans the valve guide sleeve and tooling, and applies oil to prevent rust.

[0062] In summary, the overall design of the present invention is reasonable, the structure is simple, and the operation is convenient. When the inner hole of the valve guide sleeve is finely ground, the valve guide sleeve is not completely locked, and a certain amount of free adjustment space is given to it during the processing, thereby avoiding damage and jamming of the tool caused by uneven force on the tool during honing. It not only effectively improves the processing efficiency of the inner diameter of the valve guide sleeve, but also improves the processing accuracy of the inner hole of the valve guide sleeve, which brings great convenience to the fine grinding of the inner diameter of the valve guide sleeve.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A processing tool for processing the inner hole of a valve guide sleeve, characterized in that: include A connecting plate, which is fixedly mounted at the center of the machine tool worktable by means of keyway positioning and bolts; A valve guide sleeve lower end positioning structure for effectively positioning the lower end of the valve guide sleeve that needs to undergo inner hole fine grinding, wherein the valve guide sleeve lower end positioning structure is arranged at the center of the connecting plate, and its axis coincides with the axis of the machine tool spindle; A valve guide sleeve upper end positioning structure is used to effectively position the upper end of a valve guide sleeve that requires inner hole fine grinding. The valve guide sleeve upper end positioning structure is arranged on a connecting plate through a supporting structure, and its axis coincides with the axis of the valve guide sleeve lower end positioning structure.

2. A processing tool for processing the inner hole of a valve guide sleeve as claimed in claim 1, characterized in that: The valve guide sleeve lower end positioning structure comprises: A base, which is fixed and installed at the center of the connecting plate by bolts; A limit seat, lugs are symmetrically arranged on both sides of the limit seat, a plurality of fixing holes are arranged on the lugs at intervals along the length direction thereof, bolts are selected to pass through the fixing holes to fix the lugs at the upper end of the base, a positioning hole is arranged at the center position of the upper end of the limit seat, the axis of the positioning hole coincides with the axis of the machine tool spindle, and a fine grinding clearance hole is also arranged at the center position of the limit seat, the inner diameter of the fine grinding clearance hole is smaller than the inner diameter of the positioning hole and larger than the outer diameter of the fine grinding tool, and the axis thereof coincides with the axis of the positioning hole; A positioning ring is used to effectively position the lower end of a valve guide sleeve that needs inner hole fine grinding. The positioning ring is fixedly installed in the positioning hole. The inner diameter of the positioning ring is larger than the outer diameter of the valve guide sleeve, and its axis coincides with the axis of the positioning hole.

3. A processing tool for processing the inner hole of a valve guide sleeve as claimed in claim 2, characterized in that: The supporting structure includes an upper top plate, and support rods for fixing it to a connecting plate are symmetrically arranged on both sides of the upper top plate, the lower ends of the support rods are arranged on the connecting plate, and the upper ends of the support rods are fixed to U-shaped fixing grooves symmetrically opened on both sides of the upper top plate by nuts, and a threaded hole is opened at the center position of the upper top plate, and the axis of the threaded hole coincides with the axis of the machine tool spindle.

4. A tooling for machining the inner hole of a valve guide sleeve as claimed in claim 3, characterized in that: The valve guide sleeve upper end positioning structure includes a threaded positioning sleeve for effectively positioning the upper end of the valve guide sleeve that requires inner hole fine grinding. An external thread matching the threaded hole is provided in the middle of the outer circumferential surface of the threaded fixing sleeve. The inner hole of the threaded positioning sleeve is divided into an upper end positioning hole and a fine grinding through hole. The fine grinding through hole is arranged on the upper side of the upper end positioning hole and is coaxial with the upper end positioning hole. The axis of the upper end positioning hole coincides with the axis of the threaded hole. The inner diameter of the upper end positioning hole is larger than the outer diameter of the upper end of the valve guide sleeve.

5. A processing tool for processing the inner hole of a valve guide sleeve as claimed in claim 1, characterized in that: The processing tooling for processing the inner hole of the valve guide sleeve also includes a clamping assembly that can effectively fix the valve guide sleeve to prevent it from rotating during the fine grinding process. The clamping assembly is clamped at the middle position of the outer peripheral surface of the valve guide sleeve that needs to undergo inner hole fine grinding. The clamping assembly is fixedly arranged on the positioning structure at the lower end of the valve guide sleeve by a limiting bolt.

6. An operating method for a tooling for machining an inner hole of a valve guide sleeve, characterized in that: The operation method is implemented based on a processing tool for processing the inner hole of a valve guide sleeve as described in any one of claims 1 to 5, and includes the following steps: Step 1: The operator cleans the outer surface and inner hole of the valve guide sleeve and performs size inspection; The second step: clamping the valve guide sleeve that has been cleaned and passed the size inspection, and clamping the clamping assembly in the middle of the outer surface of the valve guide sleeve; Step 3: Remove the threaded positioning sleeve, vertically install the lower end of the valve guide sleeve into the positioning ring, and then install the threaded limit sleeve to position its upper end, ensuring that the upper and lower outer circles of the valve guide sleeve are all positioned in the tooling; Step 4: After positioning the upper and lower ends of the valve guide sleeve, the operator manually moves the honing tool down to set the up and down movement position of the tool, where L is the actual movement stroke of the honing tool rod; Step 6: After the relevant parameters of the honing tool are set, close the equipment door, run the honing program, and hone the inner hole of the valve guide sleeve; Step 7: After the program is completed, the operator opens the door, removes the threaded limit sleeve, takes out the valve guide sleeve, removes the clamping assembly, measures the inner hole size, cleans the valve guide sleeve and tooling, and applies oil to prevent rust.

7. The method for operating a tool for machining the inner hole of a valve guide sleeve according to claim 6, characterized in that: The cleaning in the first step is to clean the cutting fluid and iron filings remaining on its surface; the size inspection is to re-check whether the outer circle and inner hole dimensions meet the original process size requirements, confirm that there are no flanging burrs on the lower reference surface, and clean the tooling reference surface.

8. The method for operating a tool for machining the inner hole of a valve guide sleeve according to claim 6, characterized in that: The sandpaper in the clamping assembly in the second step fits against the outer surface of the valve guide sleeve, which can generate a certain friction force.

Images