Five-axis machine tool cradle shaft glue pouring structure and positioning technology

Abstract

The invention relates to a glue pouring structure for cradle shafts of a five-axis machine tool. The structure is that the cradle shafts on the two sides of a cradle are in glue face fit with positioning holes of a machine tool body respectively; a countersunk groove is formed in a matching hole of the lathe bed, a flange plate is arranged at the cradle shaft assembling position, a plurality of connecting through holes are evenly distributed in the circumference of the flange plate, and countersunk threaded holes are formed in the corresponding positions of the end face of the countersunk groove of the lathe bed. A plurality of glue injection passages are circumferentially and evenly distributed on the end face of the countersunk groove of the lathe bed and the end face close to the cradle, each glue injection passage is composed of an axial hole and a radial hole, each axial hole is communicated with an inner cavity of the positioning hole of the lathe bed through the corresponding radial hole, and the axial holes are exposed out of the outer circumferential face of the flange plate. According to the glue filling structure, the glue can be uniformly distributed on the vertical surface of the flange on the circumferential surface after the cradle shaft and the bed body are positioned, so that the positioning precision is ensured. The other purpose of the invention is to realize high-precision positioning of the cradle shaft and the positioning hole of the bed body and improve the assembly efficiency through the positioning process provided by the invention.

Description

Technical Field

[0001] The invention relates to a glue-filling structure and a positioning process for a cradle shaft of a five-axis machine tool, and belongs to the technical field of assembling cradle shafts of machine tools. Background Art

[0002] The cradle shaft structure of a five-axis machine tool is mostly composed of separate bearing support units at both ends. The bottom surface of the bearing support unit is connected to the bed through a plane, and an adjustment pad structure is arranged between the contact surfaces. By changing the thickness of the adjustment pad, the accuracy requirement of the common axis at both ends being parallel to the X-axis is achieved. This structure has poor positioning accuracy, complex positioning process, and poor rigidity of the bearing support unit, which cannot withstand heavy processing parts.

[0003] The bearing support units at both ends of our company's cradle shaft are directly machined in the machine bed with positioning holes and surfaces, which improves the overall rigidity and can achieve a larger cutting feed. However, this structure brings high precision requirements, which cannot be achieved by traditional processing methods.

[0004] Since the positioning hole does not have the technical conditions for scraping and grinding, the end face has the conditions for scraping and grinding. In the past, the structure and process of hole filling and surface scraping and grinding have been implemented for a long time. However, due to the difficulty and workload of scraping and grinding, and the high cost of grinding tools, research on hole and end face filling technology is also a development need of the company. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a glue pouring structure and positioning process for the cradle shaft of a five-axis machine tool. The glue pouring structure can realize that after the cradle shaft and the bed are positioned, the colloid can be evenly distributed on the vertical surface of the flange on the circumferential surface, thereby ensuring the positioning accuracy.

[0006] Another purpose of the invention is to achieve high-precision positioning of the cradle axis and the bed positioning hole through the positioning process of the present application, while being able to slow down the positioning process and improve assembly efficiency.

[0007] To solve the above problems, the specific technical scheme of the present invention is as follows: a glue filling structure for the cradle shaft of a five-axis machine tool, the cradle shafts on both sides of the cradle are respectively matched with the glue surfaces between the positioning holes of the bed body; a countersunk groove is provided at the matching hole of the bed body, and a flange is provided at the cradle shaft assembly position, a plurality of connecting through holes are evenly distributed around the circumference of the flange plate, and a countersunk threaded hole is provided at the corresponding position on the end face of the countersunk groove of the bed body; a plurality of glue injection passages are evenly distributed around the circumference on the end face of the countersunk groove of the bed body and the end face close to the cradle, each glue injection passage is composed of an axial hole and a radial hole, each axial hole is communicated with the inner cavity of the positioning hole of the bed body through the corresponding radial hole, and the axial hole is exposed on the outer circumferential surface of the flange plate.

[0008] There are eight groups of injection passages consisting of axial holes and radial holes, among which the bottom group is the injection holes and the remaining seven groups are exhaust holes.

[0009] The positioning hole of the bed is processed into a thread with a pitch of 1.5 mm and a roughness of Ra3.2-12.5; the roughness of the outer circumference of the flange of the cradle shaft is Ra0.8.

[0010] The glue injection method based on the glue injection structure of the cradle shaft of a five-axis machine tool includes the following steps: Step 1: Insert the cradle shafts on both sides of the cradle into the positioning holes of the bed; insert three adjustment gaskets into the matching end faces of the flange and the bed, and pass three bolts through the flange, the adjustment gaskets and the bed in turn, and tighten the adjustment gaskets; Step 2: Fix the micrometer on the spindle and coaxially set the inspection rod on the cradle shaft; put the micrometer head on the inspection rod, rotate the cradle shaft, and confirm the coaxiality of the inspection rod; move the X-axis of the machine tool to confirm the parallelism of the inspection rod axis with the X-axis; when the coaxiality and parallelism values ​​are greater than the technical requirements, it is necessary to re-grind and adjust the thickness of the gasket until it meets the technical requirements; Step 3: except for setting adjustment gaskets in the countersunk grooves of the three countersunk threaded holes with connecting bolts, sealing gaskets are set in the countersunk grooves of the remaining countersunk threaded holes; annular sealing rubber rings are respectively set at the annular gap port and the flange gap port that seal the cradle shaft and the bed; Step 4: Inject glue into the injection holes. After glue flows out of each vent hole, seal it with a wire plug. Connect the top vent hole with an air pipe. Stop injecting glue after glue flows out to a certain height. Step 5: After the glue solidifies for 24 hours, disassemble it, remove the sealing gasket, and re-connect the flange to the bed with bolts to achieve glue surface matching with the positioning hole of the bed.

[0011] Before the step 3, a release agent is applied to the outer circumference of the flange of the cradle shaft and the end face matching the bed.

[0012] The glue filling structure and positioning process of the cradle shaft of the five-axis machine tool of the present application not only ensures the assembly accuracy of the cradle shaft, but also allows disassembly and maintenance without changing the accuracy. It can also be applied to other large-span structures supported by bearings at both ends to achieve high coaxial accuracy of the bearings at both ends, thereby improving the accuracy and performance of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the main view of the structure of this application.

[0014] Figure 2 This is a top view of the structure of this application.

[0015] Figure 3 It is a side view of the structure of this application.

[0016] Figure 4 for Figure 3 A partial enlarged view of .

[0017] Figure 5 This is a cross-sectional view of the present application having a glue injection passage.

[0018] Figure 6 This is a diagram of the threaded hole sealing status of the support point of this application.

[0019] Figure 7 This is a diagram of the sealing status of the threaded hole at the non-support point of this application. DETAILED DESCRIPTION

[0020] like Figures 1 to 5 As shown, a glue injection structure for the cradle shaft of a five-axis machine tool, the cradle shafts 2 on both sides of the cradle are respectively matched with the glue surfaces between the positioning holes of the bed 1; a countersunk groove is provided at the matching hole of the bed 1, and a flange 3 is provided at the assembly place of the cradle shaft 2, and a plurality of connecting through holes 11 are evenly distributed around the circumference of the flange 3, and a countersunk threaded hole 10 is provided at the corresponding position of the end face of the countersunk groove of the bed 1; a plurality of glue injection passages are evenly distributed around the circumference on the end face of the countersunk groove of the bed 1 and the end face close to the cradle, and each glue injection passage is composed of an axial hole 4 and a radial hole 5, and each axial hole 4 is communicated with the inner cavity of the positioning hole of the bed 1 through the corresponding radial hole 5, and the axial hole 4 is exposed on the outer circumferential surface of the flange 3. There are eight groups of glue injection passages composed of axial holes 4 and radial holes 5, Figure 4 The numbers 1-8 are marked in a clockwise direction, among which No. 5 at the bottom is the injection hole, and the remaining seven groups are exhaust holes, so that the injection liquid flows from bottom to top, thereby ensuring the uniformity of the injection.

[0021] The glue injection method based on the glue injection structure of the cradle shaft of a five-axis machine tool includes the following steps: Step 1: Insert the cradle shafts 2 on both sides of the cradle into the positioning holes of the bed 1; insert three adjustment gaskets 8 into the matching end surfaces of the flange 3 and the bed 1, as shown in FIG. Figure 4 As shown, three bolts pass through the flange 3, the adjustment gasket 8 and the bed 1 in sequence, and the adjustment gasket 8 is pressed tightly; because three points fix a plane, not only can the adjustment accuracy be achieved, but also the adjustment efficiency is improved; Step 2: Fix the micrometer on the main shaft, and coaxially set the inspection rod 12 on the cradle shaft 2; hit the micrometer head on the inspection rod 12, rotate the cradle shaft 2, and confirm the coaxiality of the inspection rod 12; move the X-axis of the machine tool to confirm the parallelism of the axis of the inspection rod 12 with the X-axis; when the coaxiality and parallelism values ​​are greater than the technical requirements, it is necessary to re-grind and adjust the thickness of the gasket 8 until the technical requirements are met. In this embodiment, the coaxiality of the left and right rotation centers of the cradle is 0.01mm; Step 3: If Figure 6 and Figure 7As shown, in addition to the adjustment gaskets 8 being arranged in the countersunk grooves of the three countersunk threaded holes 10 with connecting bolts, the sealing gaskets 9 are arranged in the countersunk grooves of the other countersunk threaded holes 10; an annular sealing rubber ring 6 is respectively arranged at the annular gap port and the flange gap port of the sealing cradle shaft 2 and the bed body 1, so as to ensure the sealing of the other positions except the exhaust hole during the grouting process to prevent the glue from leaking out; Step 4: Inject glue into the injection hole. Figure 4 After the glue is discharged from the vent holes No. 2 to 4 and No. 6 to 8, they are sealed with a wire plug. The vent hole No. 1 at the top is connected with an air pipe. After the glue is discharged to a certain height, the glue injection is stopped. Since the flow path of the colloid is from bottom to top, after the glue is discharged from the vent hole, it means that the gap and the end surface below the vent hole are filled. When the glue is completely discharged from the vent hole at the top, it means that the outer circumference of the flange 3 of the cradle shaft 2 and the matching end surface are all filled. Step 5: After the glue solidifies for 24 hours, disassemble it, remove the sealing gasket 9, and re-connect the flange 3 to the bed 1 with bolts to achieve glue surface matching with the positioning hole of the bed 1.

[0022] The positioning hole of the bed 1 is processed into a thread with a pitch of 1.5mm and a roughness of Ra3.2-12.5; the roughness of the outer circumference of the flange 3 of the cradle shaft 2 is Ra0.8. Before the step 3, a release agent is applied to the outer circumference of the flange 3 of the cradle shaft 2 and the end face that matches the bed 1. Through the difference in roughness and the application of the release agent, the rubber surface is more tightly connected to the positioning hole of the bed 1, and it is easier to separate from the outer circumference of the flange 3, so as to achieve the purpose of repeated disassembly.

Claims

1. A glue-filling structure for a cradle shaft of a five-axis machine tool, characterized in that: The cradle shafts (2) on both sides of the cradle are respectively matched with the positioning holes of the bed body (1) by means of glue; a countersunk groove is provided at the matching hole of the bed body (1); a flange (3) is provided at the assembly position of the cradle shaft (2); a plurality of connecting through holes (11) are evenly distributed on the circumference of the flange (3); a countersunk threaded hole (10) is provided at a corresponding position on the end surface of the countersunk groove of the bed body (1); a plurality of glue injection passages are evenly distributed on the circumference on the end surface of the countersunk groove of the bed body (1) and on the end surface close to the cradle; each glue injection passage is composed of an axial hole (4) and a radial hole (5); each axial hole (4) is communicated with the inner cavity of the positioning hole of the bed body (1) through a corresponding radial hole (5), and the axial hole (4) is exposed on the outer circumferential surface of the flange (3).

2. The glue-filling structure of the cradle shaft of a five-axis machine tool according to claim 1 is characterized in that: There are eight groups of glue injection passages composed of axial holes (4) and radial holes (5), of which the bottom group is the glue injection holes and the remaining seven groups are exhaust holes.

3. The glue-filling structure of the cradle shaft of a five-axis machine tool according to claim 1 is characterized in that: The positioning hole of the bed (1) is processed into a thread with a pitch of 1.5 mm and a roughness of Ra3.2-12.5; the roughness of the outer circumference of the flange (3) of the cradle shaft (2) is Ra0.

8.

4. The method for injecting glue based on the glue injection structure of the cradle shaft of the five-axis machine tool according to claim 2 is characterized in that The following steps are involved: Step 1: Insert the cradle shafts (2) on both sides of the cradle into the positioning holes of the bed (1); insert three adjustment gaskets (8) into the matching end surfaces of the flange (3) and the bed (1); three bolts pass through the flange (3), the adjustment gaskets (8) and the bed (1) in sequence, and tighten the adjustment gaskets (8); Step 2: Fix a micrometer on the spindle and coaxially set a check rod (12) on the cradle shaft (2); place the micrometer head on the check rod (12), rotate the cradle shaft (2), and confirm the coaxiality of the check rod (12); move the X axis of the machine tool to confirm the parallelism of the axis of the check rod (12) with the X axis; when the coaxiality and parallelism values ​​are greater than the technical requirements, it is necessary to re-grind and adjust the thickness of the gasket (8) until the technical requirements are met; Step 3: except for the three countersunk threaded holes (10) with connecting bolts in which adjusting gaskets (8) are arranged, sealing gaskets (9) are arranged in the countersunk grooves of the remaining countersunk threaded holes (10); annular sealing rubber rings (6) are respectively arranged at the annular gap port and the flange gap port of the sealing cradle shaft (2) and the bed (1); Step 4: Inject glue into the injection holes. After glue flows out of each vent hole, seal it with a wire plug. Connect the top vent hole with an air pipe. Stop injecting glue after glue flows out to a certain height. Step 5: After the glue solidifies for 24 hours, disassemble and remove the sealing gasket (9), and re-connect the flange (3) and the bed (1) with bolts to achieve glue surface matching between the outer circumference of the flange (3) and the positioning hole of the bed (1).

5. The method for injecting glue of the glue injection structure of the cradle shaft of a five-axis machine tool according to claim 3, characterized in that: Prior to step 3, a release agent is applied to the outer circumference of the flange (3) of the cradle shaft (2) and the end surface that matches the bed (1).

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