Quenching core eccentric hole processing method and core

Abstract

The application relates to a quenching core eccentric hole machining method and a core. The method comprises the following steps: step 1, rough machining is carried out on a core blank, a lengthened head is left on the core head, and a center hole is punched; step 2, an eccentric hole is machined by using a deep hole drill, and then quenching heat treatment is carried out; step 3, after the heat treatment, a self-made plug which is in interference fit with the eccentric hole is used to block the eccentric hole, and a center hole is punched on the outer circle center of the plug; step 4, the outer circle of the core is precisely machined to the size by clamping the center holes at the two ends of the core; and step 5, the plug on the eccentric hole is drilled by a bench worker. The core is a cylinder, one side end face is provided with a forming, and the other side end face is provided with an eccentric hole. The application solves the problem of low machining efficiency caused by the water hole machining after the heat treatment in the traditional machining method, and the tool cost can be saved by the machining method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing and relates to a quenching core eccentric hole processing method and a core. BACKGROUND

[0002] Patent document CN209080956U discloses an axle part conveying system, which comprises an axle part turnover box and a stacking elevator. The stacking elevator comprises a lifting support and a first supporting frame and a second supporting frame capable of moving oppositely to respectively hold the axle part turnover box from both sides of the axle part turnover box. The bottom of the axle part turnover box is provided with supporting grooves for the first supporting frame and the second supporting frame to be inserted into. The stacking elevator further comprises a lifting frame installed on the lifting support and fixedly connected with the first supporting frame and the second supporting frame to lift the axle part turnover box. The structure of the stacking machine is simplified due to the small number of types and quantities of key components of the stacking elevator. The first supporting frame and the second supporting frame can be respectively inserted into the supporting grooves on both sides of the axle part turnover box, so that the axle part turnover box is stable under force. Therefore, the axle part conveying system provided by the utility model has a simple structure and high working reliability.

[0003] The above patent document is different from the field of the present application.

[0004] Patent document CN201310068017.6 discloses an axle part quenching inductor and a quenching method. The axle part quenching inductor is a ring body, the inner surface is a conical surface, and the bottom surface is an inclined surface. A self-cooling water channel and a quenching liquid channel are formed in the cavity. A magnetic conducting layer is formed on the outer surface, the inner surface, the top surface and the bottom surface of the quenching inductor. The axle part quenching system comprises an axle part and the axle part quenching inductor. The quenching method forms an included angle between the inner surface of the inductor and the cylindrical surface, and an included angle between the bottom surface and the lower end surface. The axle part quenching inductor and system have reasonable structure, are convenient to use, have low manufacturing cost, and are suitable for axle parts including hollow axle parts and thin-walled pipes. The quenching method has simple process and low requirement on hardware conditions.

[0005] The above patent document is different from the field of the present application.

[0006] The patent document CN105921777B provides a kind of eccentric hole processing method, first, eccentric hole reference line P1, eccentric hole center position A, groove hole reference line P2, groove center position are determined on the part pipe;Then the part pipe is installed on boring machine processing platform, make boring machine spindle center be at the eccentric hole reference line P1 position on the part pipe;Part pipe is clamped and fixed, and eccentric hole is processed on the part pipe;Part pipe is loosened again, boring machine spindle height is adjusted and part pipe is rotated, make boring machine spindle center be at the groove hole reference line P2 position on the part pipe;Finally, part pipe is clamped and fixed, and eccentric hole groove is processed on the part pipe.This application can process the eccentric hole and groove with complex design structure by using conventional boring machine and drill, marking needle, and the size precision of the pipe hole processed is high, which is convenient for large-scale use in production workshop.

[0007] The above patent document is different from the field, material and processing concept of the present application. SUMMARY

[0008] The technical problems to be solved by the present application are to reduce the wear rate of processing tools while ensuring the eccentric distance between the inner hole and the outer circle of the eccentric hole core after quenching, to reduce the cost, to solve the problem of low processing efficiency caused by processing point water hole after heat treatment in the traditional processing method, and to provide a quenching core eccentric hole processing method and core.

[0009] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0010] To solve the above technical problems, the present application is realized by using the following technical scheme:

[0011] A quenching core eccentric hole processing method, comprising the following steps:

[0012] Step 1: rough machining is carried out on the core blank, a lengthened head is left on the core head, and a center hole is punched;

[0013] Step 2: eccentric hole is processed by using deep hole drill, and then quenched heat treatment is carried out;

[0014] Step 3: after heat treatment, a self-made plug with interference fit with eccentric hole is used to plug the eccentric hole, and a center hole is re-drilled at the center of the plug outer circle;

[0015] Step 4: Grind the outer diameter of the core to fit the center holes at both ends of the core and finish the outer diameter of the core to the required dimensions.

[0016] A method for machining eccentric holes in a quenched core further includes step 5: a fitter scribing out the plug on the eccentric hole.

[0017] Furthermore, in step 1, during rough machining, the lathe operator rough-machines the core until the outer diameter is exposed to light.

[0018] Allow for finishing work, leave an extension head at the core head, and drill a center hole;

[0019] Furthermore, in step 3, the outer diameter of the self-made plug is 0.02 mm larger than the diameter of the eccentric hole to achieve an interference fit.

[0020] Furthermore, an eccentric hole is drilled before heat treatment. After heat treatment, the eccentric hole is sealed with a plug. This plug is then used in conjunction with a grinding process to machine the core diameter to the required size, thereby ensuring both the dimensional tolerance of the core's outer circle and the eccentricity between the core's outer circle and the eccentric hole.

[0021] Furthermore, in step 3, a new center hole is drilled at the center of the outer circle of the plug. The newly drilled center hole will occupy half of the end face of the plug and half of the end face of the core.

[0022] Furthermore, the diameter of the central hole mentioned in step 1 is 3 mm.

[0023] A core using the aforementioned quenching core eccentric hole machining method is characterized in that: the core is a cylinder, with a shaped end face on one side and an eccentric hole on the other side along the axial direction of the core.

[0024] Furthermore, the center of the eccentric hole is not coaxial with the core shaft, and there is an eccentricity of 1.5 mm between them.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The processing method of this invention can save tool costs for each quenched eccentric hole core processed.

[0027] 2. Processing efficiency is increased threefold.

[0028] 3. Low investment cost, easy to master, and easy to promote and apply. Attached Figure Description

[0029] The invention will now be further described with reference to the accompanying drawings:

[0030] Figure 1 A schematic diagram of a quenched core for an eccentric hole that needs to be machined;

[0031] Figure 2 For rough turning of the outer circle, the head is left with a lengthened head, and a center hole is punched as a schematic diagram;

[0032] Figure 3 For drilling eccentric holes with deep hole drills, quenching treatment is used to improve hardness as a schematic diagram;

[0033] Figure 4 For making cylindrical plugs, interference inlaying is performed into eccentric water holes, and a center hole is punched at the tail as a schematic diagram;

[0034] Figure 5 For plugging the eccentric hole of the plug, a center hole is punched again at the center of the end face of the core as a schematic diagram;

[0035] Figure 6 For holding the center holes at both ends, the outer circle of the core is ground as a schematic diagram;

[0036] Figure 7 For drawing the center line of the plug position by the bench worker, the plug is drilled out, and the original shape of the core is restored as a schematic diagram. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the implementation of the present application more clear, the technical scheme in the embodiment of the present application will be described in more detail below in combination with the drawings in the embodiment of the present application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0039] The present application will be described in detail below in combination with the drawings:

[0040] In the present application, the eccentric hole of the quenching core is processed according to the following five steps:

[0041] First step, rough machining, rough machining core to see the light, leaving the finishing amount, leaving the length of the head in the core head, drilling the center hole;

[0042] Second step, deep hole drilling to complete the eccentric hole, then quenching heat treatment.

[0043] Third step, after heat treatment, make a plug with an outer diameter of 0.02mm larger than the diameter of the eccentric hole, interference fit. Use the plug to block the eccentric hole. The lathe operator flattens the plane connected to the plug on one side of the core eccentric hole and drills the center hole.

[0044] Because the core axis and the center of the eccentric hole have only 1.5mm eccentric distance, the center drill diameter is 3mm, so the newly drilled center hole will occupy half of the plug end face and half of the core end face;

[0045] This center hole is different from the center hole in step 1. The center hole in step 1 is on the shaped side of the core with a lengthened head, such as Figure 4 The left side is the center hole with the shaped side, and the center hole drilled on the eccentric hole side is Figure 4 The right side is the eccentric hole side.

[0046] Figure 2 The end face on the side of the Chinese guide line has the center hole described in step 1, but the center hole diameter is only 3mm, which is relatively small, so it is not obvious.

[0047] Fourth step, grinding the outer circle of the core with the center hole at both ends of the core, finishing the outer circle of the core to size.

[0048] The center hole at both ends of the core refers to the center hole on the shaped side of the lengthened head along the axial direction of the core and the center hole on the end face of the eccentric hole side, such as Figure 4 The left side is the center hole with the shaped side, that is, the center hole drilled in step 1, and the right side is the center hole with the eccentric hole side, that is, the center hole drilled again after the eccentric hole is blocked in step 3, which belongs to two different center holes. The two center holes are distributed on the left and right end faces of the core in the axial direction.

[0049] The outer circle grinding machine refers to a machine tool for grinding the outer circle, which uses a grinding wheel to grind the outer circle of the core to ensure the size tolerance of the outer circle of the core. The machining principle is to drill a center hole on each end face in the axial direction of the core, clamp the two centers of the grinding machine, and grind the outer circle of the core after the left and right center holes of the core are clamped on the left and right sides of the core in the axial direction, to ensure the cylindricity of the outer circle of the core relative to the core axis and the size tolerance.

[0050] Ensure coaxial with the center hole of the head, and grind the outer circle of the core workpiece by clamping the center holes at both ends, so as to ensure the eccentric distance between the outer circle of the workpiece and the eccentric water hole.

[0051] Fifth step, the jig operator drills the plug on the eccentric hole.

[0052] The core worker draws a line on the end face of the core on the side of the plug, like Figure 4 Draw a line on the right side of the core, which is the center line of the plug cylinder, the purpose is to determine the drilling position when the core worker drills the hole to remove the plug.

[0053] After the outer circle and eccentric hole of the core are processed, the plug needs to be removed, because the center of the eccentric hole and the core axis have only 1.5mm eccentricity, when the eccentric hole is drilled, the core axis position will be contained in the eccentric hole, and the center hole of the core axis on the end face cannot be drilled in the later stage, so a plug is added to block the eccentric hole, and the hollow area formed by drilling the eccentric hole is temporarily eliminated, thereby solving the problem that the center hole of the core axis cannot be drilled after the eccentric hole is drilled.

[0054] The core eccentric hole is processed, which ensures the dimensional tolerance of the workpiece and avoids tool waste. The tool cost is reduced by 1200 yuan for each quenched eccentric hole core, and the processing efficiency is improved by 3 times.

[0055] As shown in the three-dimensional and two-dimensional drawings of the quenched eccentric hole core, the center of the point-through water hole of the finished core tail has a small eccentricity of 1.51mm from the center of the outer circle. This structural design is a difficult point in processing and is the main problem to be solved by the present application. Figure 1 The outer circle center refers to the axis of the core, and the outer circle refers to the outer circle of the core, i.e. the diameter size of the core.

[0056] From the perspective of process design, the machining process of the core is analyzed. In order to reduce the amount of heat treatment, improve the overall machining efficiency, and provide a reference for subsequent processing, the core blank is first rough machined. Turn the outer circle of the core, leave the finishing allowance. And leave a lengthened head at the forming end, and punch a center hole at the lengthened head position to protect the forming from being damaged by the center hole.

[0057] The core after rough machining. Figure 2 After obtaining the tool setting reference surface by rough machining, the eccentric hole is machined to size by using a deep hole drill. Compared with other machining methods, the deep hole drill can more effectively ensure the position and size accuracy of the hole. After machining to

[0058] state, heat treatment can be carried out to increase the hardness of the workpiece. Figure 3 The processing after heat treatment is the technical breakthrough point of the present application. A self-made plug with interference fit with the eccentric hole is used to block the eccentric hole, and a center hole is punched again at the outer circle center of the plug (as shown in

[0059] Figure 4 ​). The center hole is matched with the center hole of the workpiece head in the next process, and the outer circle grinding top is against the center hole of both ends, and the outer circle and platform size are processed in place. Through this processing method, the drill point through water hole protection tool before heat treatment is realized, the machining efficiency is improved, and the coaxiality of the hole and the outer circle is ensured when the outer circle is ground after heat treatment, the 1.51mm small eccentricity is ensured, the product structure is deformed, and the design is inconsistent.

[0060] Referring to Figure 4 , Figure 5 , after the third step of heat treatment, a self-made plug with interference fit with the eccentric hole is used to block the eccentric hole, and a center hole is re-drilled at the center of the tail end face of the core.

[0061] Referring to Figure 6 , the grinder clamps a center on both sides, and the center hole of the core head and the tail center hole is pressed against the core outer circle grinding, which ensures the coaxiality of the core outer circle relative to the core axis, and ensures the size tolerance of the core outer circle. And ensure that the core axis and the 1.5mm eccentricity of the eccentric hole drilled in the second step are unchanged.

[0062] Referring to Figure 7 , the fitter draws the center line of the plug position, drills the plug, and restores the original shape of the core.

[0063] At this point, all the processes for processing the eccentric hole of the quenched core are completed, which ensures the size tolerance of the core outer circle, and ensures the eccentricity size of the core axis and the eccentric hole center. And on the basis of ensuring the size tolerance of the workpiece, the tool waste is avoided, the tool cost is reduced by 1200 yuan for each quenched eccentric hole core, and the machining efficiency is improved by 3 times.

[0064] The present application provides a core processing method using a quenched core eccentric hole, which is a cylindrical body, and has a molding on one side end face and an eccentric hole on the other side end face along the axial direction of the core.

[0065] The center of the eccentric hole is different from the axis of the core, and there is a 1.5mm eccentricity between them.

[0066] The plug is an auxiliary tool used to eliminate the hollow area of the eccentric hole when drilling the center hole of the core itself in this processing method.

[0067] Eccentric hole core structure: the core is a cylindrical workpiece, and has a molding on one side end face and a through water hole (eccentric hole) on the other side end face along the axial direction of the core, Figure 4The left side is an end face with a forming, and the right side is provided with a point through water hole (eccentric hole), the center of the point through water hole (eccentric hole) is different from the axis of the core, and the eccentric distance between the two is 1.5MM, the core needs to be processed to ensure the diameter size tolerance of the core, and the eccentric distance of 1.5MM between the center of the eccentric hole and the axis of the core is also ensured, which is a processing difficulty, because after drilling the eccentric hole, the hole will cut the eccentric distance of 1.5MM, and in the later grinding of the outer circle of the core, the center hole of the axis of the core cannot be made, the grinder cannot be pressed against the center hole of the axis of the core to grind the outer circle of the core, if the eccentric hole center is forced to grind the outer circle of the core, the eccentric distance between the eccentric hole center and the axis of the core cannot be ensured. Therefore, a plug needs to be made to plug the eccentric hole, and then the axial center hole of the core is drilled, so that the outer circle of the core is ground.

[0068] The application is applied to the case that the end face of the shaft part has an eccentric hole, and belongs to the field of mechanical processing method innovation.

[0069] The plug is used to plug the eccentric hole, the processing of the point through water hole is advanced to before heat treatment, the processing mode of the shaft part with the eccentric hole is changed from rigid processing to flexible processing, and the problem of serious tool wear and high cost is solved.

[0070] The center hole of the outer circle is drilled on the plug, the center hole of the forming end can be matched in the subsequent outer circle grinding process, and the eccentric distance between the hole center and the axis is ensured to be not affected by the point through water hole drilled before heat treatment.

[0071] The processing sequence is adjusted, the point through water hole is drilled before heat treatment, the tool wear after quenching is avoided, the processing time is increased, and the error caused by the skew of the water hole is avoided.

[0072] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, any modification, equivalent replacement and improvement made by those skilled in the art within the technical range disclosed by the application, within the spirit and principle of the application, should be covered within the protection scope of the application. Meanwhile, the contents not described in detail in the specification all belong to the prior art known by those skilled in the art.

Claims

1. A method for machining eccentric holes in a quenched core, characterized in that, Includes the following steps: Step 1: Roughly machine the core blank, leave an extension head at the core head, and drill a center hole; Step 2: Machin the eccentric hole using a deep hole drill, and then perform a quenching heat treatment; Step 3: After heat treatment, use a self-made plug that is interference-fitted with the eccentric hole to block the eccentric hole, and drill a new center hole at the center of the outer circle of the plug. Step 4: Grind the outer diameter of the core to the required dimensions by pressing the center holes at both ends of the core with the outer diameter grinding wheel; Before heat treatment, an eccentric hole is drilled. After heat treatment, the eccentric hole is sealed with a plug. This plug is then used in conjunction with a grinding process to machine the core diameter to the required size, thereby ensuring both the dimensional tolerance of the core's outer circle and the eccentricity between the core's outer circle and the eccentric hole. In step 3, a new center hole is drilled at the center of the outer circle of the plug. The newly drilled center hole will occupy half of the end face of the plug and half of the end face of the core. The center of the eccentric hole is not coaxial with the core axis, and there is an eccentric distance of 1.5MM between them; The core is a cylinder with a molding on one end face and an eccentric hole on the other end face along the axial direction of the core.

2. The method for machining eccentric holes in a quenched core according to claim 1, characterized in that: It also includes step 5: the fitter marks the lines to drill out the plug on the eccentric hole.

3. The method for machining eccentric holes in a quenched core according to claim 1, characterized in that: In step 1, during rough machining, the lathe operator rough-machines the core until the outer circle is exposed to light, leaving room for finishing, leaving an extension head at the head of the core, and drilling a center hole.

4. The method for machining eccentric holes in a quenched core according to claim 1, characterized in that: In step 3, the outer diameter of the self-made plug is 0.02 mm larger than the diameter of the eccentric hole to achieve an interference fit.

5. The method for machining eccentric holes in a quenched core according to claim 1, characterized in that: The diameter of the central hole mentioned in step 1 is 3 mm.

6. A core using the eccentric hole machining method for quenched cores as described in any one of claims 1 to 5, characterized in that: The core is a cylinder with a molding on one end face and an eccentric hole on the other end face along the axial direction of the core.

7. The core according to claim 6, characterized in that: The center of the eccentric hole is not on the same axis as the core shaft, and there is a 1.5mm eccentricity between them.

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