A method for fixing a housing and a main shaft

Abstract

A method for fixing a housing and a spindle includes a spindle and a housing for fixing it onto the spindle. A receiving groove for accommodating a locating pin is formed on the side of the housing, and a matching locating pin is inserted into the receiving groove. The inner end of the locating pin is positioned at the bottom of the receiving groove, and the locating pin is fixed within the receiving groove. A mounting hole penetrating the housing is bored on the end face of the housing, the diameter of the mounting hole being the same as the diameter of the spindle. Simultaneously, the bottom of the receiving groove and the inner end of the locating pin are bored away, so that the bored surface of the locating pin coincides with the inner wall surface of the mounting hole. The spindle is inserted through the mounting hole. The locating pin is re-fixed, so that the bored surface of the locating pin abuts against the spindle. The locating pin exerts pressure on the spindle and, in conjunction with the inner wall surface of the mounting hole, clamps and positions the spindle within the mounting hole, thus completing the fixing of the spindle within the housing. This invention improves the clamping effect of the locating pin and the mounting hole on the spindle and facilitates the axial movement adjustment of the spindle.

Description

Technical Field

[0001] The invention relates to a connection technology between an inner housing and a main shaft of a bearing grinder, and in particular to a method for fixing a housing and a main shaft. Background Art

[0002] At present, the bearing grinding machine industry often adopts clamping type and end face flange type for the external circle fixing of electric spindle and mechanical spindle. The clamping type is to cut a notch on the surface of the casting and perform a C-type clamping (such as Figure 1 As shown), the advantage of this method is that the axial position is easy to adjust, but the disadvantage is that the clamping point is unstable, and after the mounting hole is processed, the mounting hole is easily deformed due to the presence of the cut. In addition, it is difficult to measure the size and cylindricity of the mounting hole, which makes it difficult to ensure product quality. The end face flange type is to fix the flange at the front end of the outer sleeve of the spindle, and connect it to the housing through the screw holes on the flange to achieve the purpose of fixing the spindle on the housing. This method is suitable for shorter shafts. The disadvantage is that there is only front end support, and the spindle cannot be adjusted at any time along its axial direction, which is not conducive to the machine tool adapting to more processing conditions. In addition, when the spindle is long, there is a clearance fit between the spindle and the housing, which can easily cause insufficient rigidity of the non-flange end. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a method for fixing a housing and a main shaft, aiming to improve the fixing effect between the main shaft and the housing.

[0004] A method for fixing a housing and a main shaft, comprising a main shaft and a housing for fixing the main shaft, comprising the following steps:

[0005] Step 1: A receiving groove for receiving the positioning pin is provided on the side of the housing, and a matching positioning pin is inserted into the receiving groove;

[0006] Step 2: Make the inner end of the positioning pin be located at the bottom of the receiving groove, and fix the positioning pin in the receiving groove;

[0007] Step 3: Boring a mounting hole through the shell on the end face of the shell, the diameter of the mounting hole being the same as the diameter of the spindle, and at the same time, boring off the bottom of the receiving groove and the inner end of the locating pin so that the boring surface of the locating pin coincides with the inner wall surface of the mounting hole;

[0008] Step 4: Insert the main shaft into the mounting hole;

[0009] Step 5: Re-fix the locating pin so that the boring surface of the locating pin fits and abuts against the spindle. The locating pin generates pressure on the spindle and cooperates with the inner wall surface of the mounting hole to clamp the spindle in the mounting hole, thus completing the fixation of the spindle in the housing.

[0010] Furthermore, the hardness of the locating pin is less than that of the main shaft, the two locating pins are symmetrically arranged on both sides of the main shaft, and the angle formed between the locating point between the locating pin and the main shaft and the main shaft axis is 45°±5°.

[0011] Furthermore, the positioning pin is made of copper or copper alloy.

[0012] Furthermore, the diameter range of the locating pin is 1 / 6 to 1 / 3 of the diameter of the mounting hole, and the two locating pins are both located on the left side of the main shaft and arranged in parallel up and down.

[0013] Further, the two symmetrically arranged positioning pins are recorded as a group of positioning components, the middle part of the main shaft corresponds to a group of positioning components, or the two end portions of the main shaft respectively correspond to a group of positioning components.

[0014] Furthermore, the cross section of the receiving groove is triangular, rectangular, circular, or elliptical, and a sealing ring is provided between the receiving groove and the positioning pin.

[0015] Further: a fixing groove is opened on the shell at a position corresponding to the outer end of the positioning pin, the outer end ports of the accommodating groove are all located in the groove bottom surface of the fixing groove, the groove bottom surface of the fixing groove is arranged perpendicular to the axial direction of the positioning pin, and a fixing plate is arranged in the fixing groove, the two end portions of the fixing plate are respectively fitted with and bolted to the outer end surfaces of the two positioning pins, and the middle part of the fixing plate is bolted to the groove bottom surface of the accommodating groove; one side of the fixing plate is a plane, and a boss is integrally arranged in the middle of the plate surface of the fixing plate on the opposite side of the plane, and the table surface of the boss is arranged parallel to the plate surface and the plane where it is located; in step 3, the boss is fitted with the groove bottom surface of the fixing groove; in step 5, the fixing plate is reversed, and an adjustment gap is formed between the plane of the fixing plate and the groove bottom surface of the fixing groove, and the fixing plate presses down the positioning pin through the adjustment gap and makes the positioning pin radially press the main shaft.

[0016] Furthermore, the side walls of the fixing groove are respectively fitted with the side surfaces of the fixing plate, so that the fixing plate is placed in the fixing groove to swing.

[0017] The beneficial effects of the present invention are as follows: the shell and the locating pin are bored once so that the mounting hole is processed into a full circle, which is convenient for ensuring the cylindricity of the mounting hole, and convenient for measuring the size of the mounting hole and controlling its quality; the elliptical arc surface at the inner end of the locating pin contacts the main shaft, thereby increasing the contact area between the locating pin and the outer circumference of the main shaft, which can effectively prevent the shaft from being deformed and the precision from being lost due to poor contact during clamping; the present invention improves the clamping effect of the locating pin and the mounting hole on the main shaft, and facilitates the axial movement and adjustment of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a clamp-type housing in the background technology;

[0019] Figure 2 It is a perspective structural schematic diagram of the present invention;

[0020] Figure 3 It is a schematic diagram of the state after the housing and the positioning assembly in the present invention are assembled and bored;

[0021] Figure 4 It is a cross-sectional structural view of the fixing plate in the present invention. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. The directional terms such as left, middle, right, top, and bottom in the embodiments of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0023] A method for fixing a housing and a main shaft, such as Figure 2 and Figure 3 As shown, it includes a main shaft 4 and a housing 1 for fixing and sleeved on the main shaft 4, and includes the following steps:

[0024] Step 1: A receiving groove 12 for receiving the positioning pin 2 is provided on the side of the housing 1, and a matching positioning pin 2 is inserted into the receiving groove 12. The positioning pin 2 is made of copper or copper alloy. The cross-sectional shape of the positioning pin 2 and the receiving groove 12 is the same, that is, the side of the positioning pin 2 fits the side of the receiving groove 12. The cross-sectional shape of the receiving groove 12 is triangular, rectangular, circular, or elliptical. A sealing ring (not shown in the figure) is provided between the receiving groove 12 and the positioning pin 2. This facilitates the processing of the positioning pin 2 and prevents water from entering and corroding the housing 1.

[0025] Step 2: Make the inner end of the positioning pin 2 be located at the bottom of the receiving groove 12, and fix the positioning pin 2 in the receiving groove 12;

[0026] Step 3: boring a mounting hole 11 through the housing on the end surface of the housing 1, the diameter of the mounting hole 11 being the same as the diameter of the spindle 4, and at the same time, boring off the bottom of the accommodating groove 12 and the inner end of the locating pin 2, so that the boring surface of the locating pin 2 coincides with the inner wall surface of the mounting hole 11;

[0027] Step 4: Insert the main shaft 4 into the mounting hole 11;

[0028] Step 5: Re-fix the locating pin 2 so that the boring surface of the locating pin 2 fits and abuts against the spindle 4. The locating pin 2 generates pressure on the spindle 4 and cooperates with the inner wall surface of the mounting hole 11 to clamp and position the spindle 4 in the mounting hole 11, completing the fixation of the spindle 4 in the housing 1. In order to prevent the locating pin 2 from deforming the spindle 4, the hardness of the locating pin 2 is less than the hardness of the spindle 4. The two locating pins 2 are symmetrically arranged on both sides of the spindle 4, and the angle formed between the locating point between the locating pin 2 and the spindle 4 and the axis of the spindle 4 is 45°±5°; thereby avoiding the locating points being located on opposite sides of the spindle 4, ensuring that no mutual force is generated between the locating points, and making the forces acting on the spindle 4 by the locating points cross inside the spindle 4 Then dispersed on different inner wall surfaces of the opposite mounting holes, the clamping effect of the locating pin 2 and the inner wall of the mounting hole 11 on the main shaft 4 is improved, and the main shaft 4 is clamped from two opposite directions and deformed due to uneven force. The diameter range of the locating pin 2 is 1 / 6 to 1 / 3 of the diameter of the mounting hole 11. The two locating pins 2 are both located on the left side of the main shaft 4 and are arranged in parallel up and down, so that the force points of the main shaft 4 are away from its upper, middle and lower deformation-prone areas. The two symmetrically arranged locating pins 2 are recorded as a group of positioning components. In this embodiment, the main shaft 4 is longer, and the two end portions of the main shaft 4 correspond to a group of positioning components respectively. In other embodiments, when the length of the main shaft 4 is shorter, only the middle part of the main shaft 4 corresponds to a group of positioning components.

[0029] In order to facilitate the processing and fixing of the positioning pin 2 on the housing 1, a fixing groove 13 is opened on the housing 1 at a position corresponding to the outer end of the positioning pin 2, and the outer end ports of the accommodating groove 12 are all located in the groove bottom surface of the fixing groove 13, and the groove bottom surface of the fixing groove 13 is perpendicular to the axial direction of the positioning pin 2. A fixing plate 3 is arranged in the fixing groove 13, and the two end portions of the fixing plate 3 are respectively attached to and bolted to the outer end surfaces of the two positioning pins 2, and the middle part of the fixing plate 3 is bolted to the groove bottom surface of the accommodating groove 12; combined Figure 4 As shown, one side plate surface of the fixing plate 3 is a plane 31, and a boss 32 is integrally provided in the middle of the plate surface on the opposite side of the plane 31 on the fixing plate 3, and the table surface of the boss 32 is parallel to the plate surface where it is located and the plane 31; in step 3, the boss 32 is in contact with the bottom surface of the fixing groove 13; in step 5, the fixing plate 3 is reversed, and an adjustment gap is formed between the plane of the fixing plate 3 and the bottom surface of the fixing groove 13. The adjustment gap is formed after the boss 32 is missing between the fixing plate 3 and the bottom surface of the fixing groove 13. The fixing plate 3 presses down the positioning pin 2 through the adjustment gap and makes the positioning pin 2 radially press the main shaft 4; the side walls of the fixing groove 13 are respectively in contact with the side surfaces of the fixing plate 3 on both sides, thereby preventing the fixing plate 3 from shaking in the fixing groove 13; in order to improve the fixing effect of the fixing plate 3 and the housing 1, two fixing points are provided in the middle of the fixing plate 3; the holes for passing the bolts at both ends of the fixing plate 3 are slidably matched with the corresponding bolts, and the bolts fixedly connected to the positioning pin 2 are coaxially arranged therewith.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art 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. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which 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 method for fixing a housing and a main shaft, comprising a main shaft and a housing for fixing the main shaft, characterized in that: The following steps are involved: Step 1: A receiving groove for receiving the positioning pin is provided on the side of the housing, and a matching positioning pin is inserted into the receiving groove; Step 2: Make the inner end of the positioning pin be located at the bottom of the receiving groove, and fix the positioning pin in the receiving groove; Step 3: Boring a mounting hole through the shell on the end face of the shell, the diameter of the mounting hole being the same as the diameter of the spindle, and at the same time, boring off the bottom of the receiving groove and the inner end of the locating pin so that the boring surface of the locating pin coincides with the inner wall surface of the mounting hole; Step 4: Insert the main shaft into the mounting hole; Step 5: Re-fix the positioning pin so that the boring surface of the positioning pin fits and abuts against the spindle. The positioning pin exerts pressure on the spindle and cooperates with the inner wall surface of the mounting hole to clamp and position the spindle in the mounting hole, thus completing the fixation of the spindle in the housing. Among them, a fixing groove is opened on the shell at a position corresponding to the outer end of the positioning pin, and the outer end ports of the accommodating groove are all located in the groove bottom surface of the fixing groove, and the groove bottom surface of the fixing groove is perpendicular to the axial direction of the positioning pin. A fixing plate is arranged in the fixing groove, and the two end portions of the fixing plate are respectively fitted with and bolted to the outer end surfaces of the two positioning pins, and the middle part of the fixing plate is bolted to the groove bottom surface of the accommodating groove; one side of the fixing plate is a plane, and a boss is integrally provided in the middle of the plate surface of the fixing plate on the opposite side of the plane, and the table surface of the boss is parallel to the plate surface and the plane where it is located; in step 3, the boss is fitted with the groove bottom surface of the fixing groove; in step 5, the fixing plate is reversed, and an adjustment gap is formed between the plane of the fixing plate and the groove bottom surface of the fixing groove, and the fixing plate presses down the positioning pin through the adjustment gap and causes the positioning pin to radially press the spindle.

2. The method for fixing a housing and a main shaft according to claim 1, characterized in that: The hardness of the locating pin is less than that of the spindle. The two locating pins are symmetrically arranged on both sides of the spindle. The angle formed between the locating point between the locating pin and the spindle and the spindle axis is 45°±5°.

3. The method for fixing a housing and a main shaft according to claim 2, characterized in that: The positioning pin is made of copper or copper alloy.

4. The method for fixing a housing and a main shaft according to claim 2, characterized in that: The diameter range of the locating pin is 1 / 6 to 1 / 3 of the diameter of the mounting hole. Both locating pins are located on the left side of the spindle and are arranged in parallel up and down.

5. The method for fixing a housing and a main shaft according to claim 2, characterized in that: The two symmetrically arranged positioning pins are recorded as a group of positioning components, the middle of the main shaft corresponds to a group of positioning components, or the two end portions of the main shaft correspond to a group of positioning components respectively.

6. The method for fixing a housing and a main shaft according to claim 2, characterized in that: The cross section of the receiving groove is triangular, rectangular, circular, or elliptical, and a sealing ring is arranged between the receiving groove and the positioning pin.

7. The method for fixing a housing and a main shaft according to claim 1, characterized in that: The side walls of the fixing groove are respectively fitted with the side surfaces of the fixing plate.

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