A processing method of a permanent magnet ferrite tile alloy concave die

Abstract

The application discloses a processing method of a permanent magnet ferrite magnetic tile alloy concave die, which comprises the following steps: performing linear cutting processing on a cavity of a concave die base body, heating and expanding the concave die base body, then inserting an alloy sleeve into the cavity in an interference fit and cooling to normal temperature; performing fast wire cutting processing on a concave die arc surface, starting from the top of the concave die arc surface and processing to both sides, and each concave die arc surface is cut twice; performing first processing on the inner wall of the alloy sleeve by using fast wire cutting; placing one side of the upper platform of the concave die base body on a surface grinder, and grinding the concave die arc surface and the upper platform by using a diamond grinding wheel and a cylindrical grinding wheel; placing the upper platform downward, grinding the lower platform, taking the lower platform as a reference surface, and performing second fine processing on the inner wall of the alloy sleeve by using slow wire cutting. The method prevents excessive stress release and excessive local residual heat release during processing, avoids damage of the alloy sleeve caused by stress release, and avoids deformation of the concave die arc surface, the upper platform and the cavity, so that the processing precision of the whole concave die is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a permanent magnet ferrite tile mold technical field, in particular to a processing method of a permanent magnet ferrite tile alloy female die. BACKGROUND

[0002] The permanent magnet ferrite tile alloy mold mainly comprises an upper die (a water absorption plate), a female die and a male die, the water absorption plate arc surface and the female die arc surface are matched, the male die and the female die are dynamically matched, the single-sided gap is required to be less than 0.01 mm, and the smaller the single-sided dynamic matching gap of the male die and the female die is, the higher the mold precision is. If the mold precision is not high, the mold will have defects such as material running and cracks.

[0003] The female die is mainly composed of a weak magnetic material stainless steel (1Cr18Ni9Ti) base body and a hard alloy (YG8) sleeve, the female die stainless steel base body is heated, and then the hard alloy sleeve is inlaid into the female die stainless steel base body.

[0004] The hardness of the hard alloy is HRA89-92.5, the hardness is high, the brittleness is large, and the processing difficulty is large, stress is difficult to release in the heating and inlaying process, and deformation of the female die and damage of the hard alloy will be caused in the processing process. The hard alloy has high hardness and large brittleness, and is difficult to repair, so an urgent need exists for a processing method for preventing stress deformation of the hard alloy inlaid female die. SUMMARY

[0005] The application aims to provide a processing method of a permanent magnet ferrite tile alloy female die to solve the problems in the background art.

[0006] The purpose of the application can be achieved by the following technical scheme.

[0007] A processing method of a permanent magnet ferrite tile alloy female die, and the specific steps are as follows:

[0008] Step one: process the female die base body into a cuboid, grind the six surfaces, and then use fast wire cutting to process the female die base body cavity into a size suitable for the alloy sleeve periphery, heat the female die base body to expand, then overfit the alloy sleeve into the female die base body cavity, and naturally cool to room temperature;

[0009] Step two: process the female die arc surface by fast wire cutting, and the cutting point is from the arc top of the female die arc surface to both sides, and each female die arc surface is cut twice;

[0010] Step three: process the inner wall of the alloy sleeve by fast wire cutting for the first time;

[0011] Step four: place one side of the upper platform of the female die base body on the surface grinder, and polish the female die arc surface and the upper platform by using a diamond grinding wheel and a cylindrical grinding wheel;

[0012] Step five: grinding the lower platform downwardly, and taking the lower platform as a reference surface, the inner wall of the alloy sleeve is secondly precisely machined by using a slow wire cutting.

[0013] As a further scheme of the present application, in the step one, the concave die base is heated to 380-400 DEG C by using an industrial heat treatment resistance furnace.

[0014] As a further scheme of the present application, in the step one, the interference fit rate of the alloy sleeve and the cavity is 0.1%-0.2%.

[0015] As a further scheme of the present application, in the step one, the roughness Ra of the fast wire cutting is 2.5-3.2 um.

[0016] As a further scheme of the present application, in the step two, the concave die camber is processed in sequence from the two sides of the concave die base to the middle.

[0017] As a further scheme of the present application, in the step three, the inner wall of the alloy sleeve is firstly machined until the single side of the inner wall of the alloy sleeve has a 0.1-0.2 mm excess amount.

[0018] As a further scheme of the present application, in the step four, the roughness Ra of the surface grinder is 0.8 um.

[0019] As a further scheme of the present application, in the step four, the diamond grinding wheel has a mesh of 150 mesh.

[0020] As a further scheme of the present application, in the step five, the inner wall of the alloy sleeve is secondly precisely machined until the single side gap between the alloy sleeve and the convex die is between 0.005-0.01 mm.

[0021] The present application has the following beneficial effects:

[0022] The present application cuts each concave die camber twice symmetrically from the camber top, and processes the concave die cambers in sequence from the two sides of the concave die base to the middle, so as to prevent the excessive stress release and the excessive local residual heat release during the processing, avoid the alloy sleeve damage caused by the stress release, and avoid the deformation of the concave die camber, the upper platform and the cavity, thereby improving the processing precision of the whole concave die. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in combination with the drawings.

[0024] Figure 1is the front view of the alloy concave die in the application;

[0025] Figure 2 is the top view of the alloy concave die in the application;

[0026] Figure 3 is the side view of the alloy concave die in the application;

[0027] Figure 4 is the side view of the diamond grinding wheel in the application.

[0028] In the figure: 1, concave die base; 2, alloy sleeve; 3, cavity; 4, inner wall of alloy sleeve; 5, concave die camber; 6, upper platform; 7, lower platform. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0030] Please refer to Figures 1-3 As shown in the figure, the embodiment discloses a processing method of a permanent magnet ferrite tile alloy concave die, and the specific operation steps are as follows:

[0031] Step one: process the concave die base 1 into a cuboid, grind the six faces of the concave die base 1 through plane grinding, then process the cavity 3 of the concave die base 1 into a size suitable for the outer periphery of the alloy sleeve 2 through a fast wire cutting machine tool, then heat the concave die base 1 to 380-400℃ by using an industrial heat treatment resistance furnace, so that the cavity 3 of the concave die base 1 is heated and expanded, then embed the alloy sleeve 2 into the cavity 3 of the concave die base 1 with an interference of 0.1%-0.2%, and then naturally cool to room temperature.

[0032] The wire cutting machine tool is a tool that cuts metal materials and complex-shaped parts through electric corrosion of molybdenum wire, and at the same time, uses the principle of high-energy-density electric spark discharge ablation for processing, and the roughness Ra of the fast wire cutting is 2.5-3.2um.

[0033] Step two: the concave die camber 5 is processed by fast wire cutting. When processing each section of the concave die camber 5, the processing is symmetrically performed from the middle vertex of the concave die camber 5 to both sides in sequence, i.e. in the order of A2→A1, A10→A11, A2→A3, A10→A9, A4→A3, A8→A9, A4→A5, A8→A7, A6→A5, A6→A7. The symmetric processing of each section of the concave die camber 5 can prevent the excessive release of stress during processing and the excessive release of local residual heat during processing, thereby avoiding the deformation of the concave die base 1 and the damage of the alloy sleeve 2 during processing.

[0034] Step three: after the processing of the concave die camber 5 is completed, the alloy sleeve inner wall 4 is processed by fast wire cutting for the first time, and a single-sided allowance of 0.1-0.2mm is left on the alloy sleeve inner wall 4.

[0035] Step four: since the concave die has stress release during the first processing, deformation is inevitable, so the second processing is performed. Specifically, the lower platform 7 of the concave die base 1 is placed on a surface grinder (surface grinding finish Ra0.8um), and then a 150-mesh diamond grinding wheel is custom-made to match the camber height of the concave die camber 5 and the upper platform 6. Then, one side of the upper platform 6 is placed on the surface grinder, and the custom-made diamond grinding wheel is installed on the grinding head of the surface grinder. The diamond grinding wheel is used to perform the second processing on each section of the concave die camber 5 and the partial area of the upper platform 6, and then a surface grinding cylindrical grinding wheel is used to polish the area of the upper platform 6 between adjacent concave die cambers 5 that is not polished.

[0036] Among them, please refer to Figure 1 and Figure 4 The partial area of the upper platform 6 refers to the area of the upper platform 6 that can be covered by the edge portion of the diamond grinding wheel with a width of L3. The polishing width covered by the entire diamond grinding wheel in one pass is L1, i.e. width L1 = the width of the concave die camber 5 + twice the width L3.

[0037] Similarly, the width of the area of the upper platform 6 between adjacent concave die cambers 5 that is not polished is L2.

[0038] Step five: after the polishing of the concave die camber 5 and the upper platform 6 is completed, the concave die camber 5 is downward, the lower platform 7 is ground, and the alloy sleeve inner wall 4 is processed by slow wire cutting for the second time to achieve the finished product size, so that the size of the final alloy sleeve 2 and the single-sided gap of the male die are within the range of 0.005-0.01mm.

[0039] Among them, slow wire cutting is a high-precision processing method that uses a continuously moving copper wire as an electrode to perform pulse spark discharge to remove metal and cut the workpiece.

[0040] Through the above processing mode, both the damage of the alloy sleeve 2 caused by stress release and the deformation of the concave die arc surface 5, the upper platform 6 and the cavity 3 are avoided, so as to improve the precision of the whole concave die.

[0041] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application, without departing from the technical solution of the present application, still belong to the scope of the technical solution of the present application.

Claims

1. A method of machining a permanent magnet ferrite tile alloy female die, characterized by, The method comprises the following steps: Step one: the concave die base (1) is processed into a cuboid and the six surfaces thereof are ground, the concave die base (1) is heated to expand, then the alloy sleeve (2) is inserted into the cavity (3) of the concave die base (1) by interference, and the alloy sleeve (2) is naturally cooled to room temperature; Step two: the concave die arc surface (5) is processed by fast wire cutting, and the starting cutting point is at the top of the concave die arc surface (5) and the processing is performed towards both sides, each concave die arc surface (5) is cut twice; Step three: the inner wall (4) of the alloy sleeve is processed by fast wire cutting for the first time; Step four: one surface of the upper platform (6) of the concave die base (1) is placed on a surface grinder, and the concave die arc surface (5) and the upper platform (6) are polished by a diamond grinding wheel and a cylindrical grinding wheel; the lower platform (7) of the concave die base (1) is placed on a surface grinder with a surface finish of Ra0.8um, then a 150-mesh diamond grinding wheel is custom-made and the height of the concave die arc surface (5) and the upper platform (6) is matched, one surface of the upper platform (6) is placed on a surface grinder, the custom-made diamond grinding wheel is installed on the grinding head of the surface grinder, the diamond grinding wheel is used to process the partial area of each concave die arc surface (5) and the upper platform (6) for the second time, and then the cylindrical grinding wheel of the surface grinder is used to polish the area of the upper platform (6) between adjacent concave die arc surfaces (5) which is not polished; the partial area of the upper platform (6) refers to the area of the upper platform (6) covered by the edge part of the diamond grinding wheel with a width of L3, the polishing width covered by the diamond grinding wheel at one time is L1, that is, L1=the width of the concave die arc surface (5)+two times of the width L3; the width of the area of the upper platform (6) between adjacent concave die arc surfaces (5) which is not polished is L2; Step five: the upper platform (6) is placed downward, the lower platform (7) is ground, and the inner wall (4) of the alloy sleeve is precisely processed by slow wire cutting for the second time.

2. A method of machining a permanent ferrite tile alloy female die according to claim 1, characterized in that, In the step one, the concave die base (1) is heated by an industrial heat treatment resistance furnace to 380-400℃.

3. A method of machining a permanent ferrite tile alloy female die according to claim 2, characterized in that, In the step one, the size of the cavity (3) is 0.1%-0.2% smaller than the size of the outer periphery of the alloy sleeve (2).

4. The method of claim 1, wherein the permanent ferrite tile alloy cupping die is processed by the steps of: In the step one, the roughness Ra of the fast wire cutting is 2.5-3.2um.

5. The processing method of a permanent magnet ferrite tile alloy die according to claim 1, characterized in that, In the step two, the concave die arc surface is processed in the order from both sides of the concave die base (1) to the middle.

6. The method of claim 1, wherein the permanent ferrite tile alloy cupping die is processed by the steps of: In the step three, the inner wall (4) of the alloy sleeve is processed for the first time until the single side of the inner wall (4) of the alloy sleeve has a 0.1-0.2mm allowance.

7. A method of machining a permanent ferrite tile alloy female die according to claim 6, characterized in that, In the step five, the inner wall (4) of the alloy sleeve is precisely processed for the second time until the single side gap between the alloy sleeve (2) and the convex die is 0.005-0.01mm.

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