CN115722737A - Machining method of hardness precise internal thread - Google Patents
Machining method of hardness precise internal thread Download PDFInfo
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- CN115722737A CN115722737A CN202211336834.0A CN202211336834A CN115722737A CN 115722737 A CN115722737 A CN 115722737A CN 202211336834 A CN202211336834 A CN 202211336834A CN 115722737 A CN115722737 A CN 115722737A
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Abstract
The invention relates to a processing method of high-hardness precise internal threads, which uses a CM6140 type precision lathe, adopts a YT726 hard alloy blade, uses a special tool grinding machine and a knife grinding tool to grind the angle of a threading tool designed by a workpiece, and adopts reasonable cutting amount, grinding and detection methods to ensure that the high-hardness precise internal thread workpiece meets the design requirements.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a machining method for high-hardness precise internal threads, in particular to a machining method for turning high-precision internal threads.
Background
In the machine manufacturing process, a plurality of high-hardness precise measuring tools or precise workpieces are provided with threads, the parts are generally made of T10A or CrWMn materials, the quenching hardness HRC is 60-64, and the high-hardness precise threaded workpieces have strict requirements on the tolerance sizes of the intermediate diameter size, the angle and the thread pitch. The turning process is difficult, the size is difficult to control, the yield is low, and the use of finished products is often influenced.
Disclosure of Invention
The invention provides a method for processing a high-hardness precise internal thread, which aims to solve the technical problems that: the processing problem of high-hardness precise internal thread workpieces is solved.
In order to solve the technical problem, the invention provides a method for processing a hardness precise internal thread, which is characterized by comprising the following steps of:
s1, mounting and fixing special clamps for clamping a tool block with an internal thread to be ground on a main rear tool face and an auxiliary rear tool face of a grinding tool block;
s2, grinding the internal thread cutter block of the turning machine by using a carborundum wheel;
when a blade of a cutter block is ground, the cutter block with internal threads is placed at a 1/2 position of the lower part of the center of a grinding wheel, 1 surface is ground firstly, the tip of the cutter point is removed, 2 surfaces are ground after the corner is formed, and the cutter point removed by grinding on the 1 surface is repaired in grinding; after the cutter block is sharpened, the half angle is checked to be 30-2 'under a tool microscope, the whole angle is 60-5', the cutter block is reground when the cutter block is unqualified, and the tolerance of the intermediate diameter is controlled to be 0.01mm;
s3, carrying out angle inspection on the ground cutter block through a projection measuring instrument;
s4, turning the small internal thread diameter by adopting a tool block for turning the small internal thread diameter;
s5, aligning a cutter bar, installing a ground internal thread turning cutter block, aligning a cutter which is qualified in the S3 inspection to the center by using an optical microscope, roughly turning internal threads, and keeping the size allowance of the internal thread pitch diameter of 0.1-0.15 mm;
s6, grinding a sharp cutter of the large-diameter cutter block for turning the threads, and finishing the machining of the bottom diameter of the threads by adopting the cutter block; controlling the bottom diameter of the internal thread to enable the bottom diameter of the internal thread to be 0.2-0.3 mm larger than the diameter of the internal thread;
s7, adopting an internal thread turning cutter block to finish turning internal threads; the angle of the internal thread turning tool block for finely turning the internal thread is controlled to be 59-60 degrees;
s8, grinding the core shaft for grinding the internal thread by using a wire grinder;
and S9, grinding the internal thread after finish turning to the size of a finished product by using a grinding machine tool clamping mandrel.
Has the advantages that: the invention uses CM6140 type precision lathe, adopts YT726 hard alloy blade, uses special tool grinder and knife grinding tool, grinds the threading tool angle designed by the workpiece, selects reasonable cutting amount, grinding and detecting method, and leads the high-hardness precision internal thread workpiece to reach the design requirement.
Drawings
FIG. 1 is a schematic view of a tool dedicated for a grinding tool block
FIG. 2 is a schematic view of a grinding tooth type half angle adjusting disk
FIG. 3 is a schematic view of a tooth-shaped half-angle adjusting disk for grinding main and auxiliary flank surfaces
FIG. 4 is a schematic view of the assembly of the pitch angle adjusting disk 3
FIG. 5 is a schematic view showing the assembly of the pitch angle adjusting disk 3 with the main and tooth-shaped half angle positioning assemblies 4, the main and auxiliary flank grinding tooth-shaped half angle adjusting disk assemblies 5 and the base 6
FIG. 6 is an enlarged partial view of the pitch angle adjusting disk 3 assembled with the main and tooth-shaped half angle positioning assemblies 4, the main and auxiliary flank grinding tooth-shaped half angle adjusting disk assembly 5 and the base 6
FIG. 7 is a schematic view of the assembly of the female screw blade 1 and the stationary jaw 2
FIG. 8 is a schematic view showing the assembly of the female screw blade 1, the fixed jaw 2 and the pitch angle adjusting disk 3 and the adjustment of the angle
FIG. 9 is a schematic view of the main and auxiliary flank surfaces of a grinding female thread block
FIG. 10 is a partial enlarged view of a tooth profile half angle of an internal thread tool block controlled by grinding of main and auxiliary flank surfaces of the internal thread tool block
FIG. 11 is a schematic view of a ground small-diameter tool block for turning internal threads
FIG. 12 is a schematic view of the clamping of a cutter block and a cutter bar for processing internal threads
FIG. 13-schematic view of centering the cutter block
FIG. 14 is a schematic view of the calibration of the knife block after grinding by an optical microscope
FIG. 15 is a schematic view of clamping a threaded bottom diameter cutter block by a hand grinding tool grinding machine
FIG. 16 is a schematic view of a hand-milled thread bottom diameter block
FIG. 17 is a schematic view of a finish turning block with a ground angle
FIG. 18 is a schematic view showing the influence of the error of the point angle on the pitch diameter of the thread
FIG. 19 is a schematic view of a clamping apparatus for grinding an abrasive core by wire grinding
FIG. 20 is a schematic view showing the clamping of the grinding mandrel by a grinder and the clamping of the finish-turned internal thread workpiece.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.
The invention provides a method for processing a high-hardness precise internal thread, which specifically comprises the following steps:
s1, clamping a tool block 1 with internal threads to be ground on special fixtures for grinding main and auxiliary rear tool faces of the tool block;
as shown in fig. 1, the special fixture for grinding the main and auxiliary rear tool faces of the tool block mainly comprises a fixed claw 2, a pitching angle adjusting disc 3, a positioning assembly 4, a grinding tooth-shaped half-angle adjusting disc 5, an assembled base 6 and a carborundum grinding wheel 7;
the cutter block 1 is arranged on the cutter block blank fixing claw 2, and the cutter block blank fixing claw 2 is assembled with the pitching angle adjusting disc 3 and the angle is adjusted; the grinding tooth type half-angle adjusting disc 5 is arranged on the base assembly 6 through the positioning component 4; the pitching angle adjusting disc 3 is vertically inserted into the square groove of the grinding tooth type half angle adjusting disc 5 and is connected with the base assembly.
The assembled base comprises a base 6-1, steel balls 6-2 and 6-3 and a nut 6-4; the base 6-1 is made of a whole piece of rectangular steel die steel, and an angle scale and a groove for adjusting and positioning the positioning block in a sliding manner are carved on the top surface.
The cutter block blank fixing claw 2 mainly comprises a pressing claw 2-1, a screw 2-2, a spring 2-3, a fixing claw base 2-4 and a rotating shaft 2-5; a to-be-ground cutter block 1 is placed in a groove of a fixed claw base 2-4, and a screw 2-2 is screwed to compress a spring 2-3 downwards so that a pressing claw 2-1 presses the to-be-ground cutter block 1;
the pitching angle adjusting disc 3 mainly comprises a screwing screw 3-1, a clamping hoop 3-2, a main rear angle adjusting rotary disc 3-3, an auxiliary rear angle adjusting rotary disc 3-4, a fastening screw 3-5, a fastening nut 3-6, a spring pad 3-7 and a square rotating shaft 3-8; the clamp 3-2 is welded and fixed with the main rear angle adjusting rotary disc 3-3, the auxiliary rear angle adjusting rotary disc 3-4 is welded and fixed with the square rotating shaft 3-8 in advance, a fastening screw 3-5 penetrates through the center hole of the main rear angle adjusting rotary disc 3-3 and the center hole of the auxiliary rear angle adjusting rotary disc 3-4, a spring pad 3-7 is placed on the fastening screw 3-5, and a fastening nut 3-6 is used for pre-tightening. When the tool is used, the fastening nuts 3-6 are loosened and slight clamping force is kept, the phenomenon that the angle change is too large when the nuts are loosened and fine adjusted is avoided, the angle between the main relief angle adjusting rotary disc 3-3 and the side relief angle adjusting rotary disc 3-4 is adjusted, the horizontal elevation angle of the clamping hoop 3-2 welded with the main relief angle adjusting rotary disc 3-3 is further adjusted, therefore, the main relief angle to be ground of the internal thread tool block is controlled to be 16 +/-3', the front angle is O degrees, and after the adjustment is finished, the fastening nuts 3-6 are screwed, as shown in figure 4.
The grinding tooth type half-angle adjusting disc 5 comprises an adjusting disc 5-1 and an adjusting rod 5-2; the positioning component 4 comprises a positioning block 4-1 and a screwing screw 4-2;
the adjusting rod 5-2 is fixed on the side wall of the adjusting disc 5-1 along the radial direction, and the installed grinding tooth type half-angle adjusting disc 5 is placed in a circular groove on the top surface of the base 6-1; 2 positioning blocks 4-1 are placed in the grooves of the base 6-1 and are screwed down by 2 screwing screws 4-2; the adjusting rod is used for driving the adjusting disc to rotate relative to the base, and in the daily grinding process, the adjusting rod is slightly pushed manually to be in slight contact with the positioning assembly 4, so that the limiting can be realized; as shown in fig. 2 and 3.
The lower end of a square rotating shaft 3-8 is of a threaded structure, the square rotating shaft 3-8 is vertically inserted into a square groove of a grinding tooth type half-angle adjusting disc 5, a bearing 6-3 is arranged on the lower end face of a base 6-1 and sleeved on the square rotating shaft 3-8, the lower end of the square rotating shaft is screwed and limited by a nut 6-4, and a steel ball 6-2 is placed in the bearing 6-3, as shown in fig. 5 and 6.
The fixing claw 2 is inserted into a circular groove of a clamping hoop 3-2 in the pitching angle adjusting disc 3, the tool block blank fixing claw 2 can rotate along an inner hole of the clamping hoop 3-2 by loosening a screwing screw 3-1, so that the reference surface of the internal thread tool block is ensured to be parallel to the plane of the grinding wheel, and the screwing screw 3-1 is used for screwing and fixing. Rotating the front angle adjusting disc 3-3 according to the half angle of the thread profile required by the drawing to enable the angle to meet the requirement of the drawing; and then adjusting the position of the positioning block 4-1 on the scale in the groove of the base 6-1 according to the design requirements of the drawing, and fixing the positioning block 4-1 by screwing the screw 4-2, as shown in fig. 8.
S2, grinding the internal thread cutter block 1 of the vehicle by using the carborundum wheel
And (3) using a special fixture for fixing the tool block with the internal thread to be ground to be close to the carborundum grinding wheel 7, and grinding to the size required by the drawing as shown in figure 9.
When grinding the edge of the cutter block, the following matters are taken: the cutter block with internal threads is placed at the 1/2 position of the lower part of the center of the grinding wheel to grind 1 surface (left surface) first, the force of the cutter holder is weakest when the cutting edge is ground, and the tip of the cutter tip falls due to vibration generated during cutter grinding. After turning, 2 surfaces (right surfaces) are ground, and the tool tip ground off on the surface 1 is repaired during grinding because the tool body drags the tool tip. After the cutter block is sharpened, the cutter block must be reground when the half angle is checked to be unqualified at 30-2 'full angle 60-5' under a tool microscope, the high-hardness precision thread machining is strictly and finely controlled within a specified range in each step, and the medium diameter tolerance is controlled to be 0.01mm. As shown in fig. 10.
And S3, carrying out angle inspection on the ground internal thread turning cutter block through a projection measuring instrument.
S4, turning the internal thread small diameter by adopting a tool block for turning the internal thread small diameter:
the turning tool block with the small diameter of the internal thread has a main deflection angle of 30 degrees and a main back angle of 14 degrees +/-5', increases the radial force, reduces the axial force, and solves the problem that the tool block is abraded too fast in the cutting process. The sharp angle of the knife is 120 degrees, the purpose is to solve the problem of good heat dissipation of the knife tip, the durability of the knife block is improved, and the size of the sharp angle of the knife is accurate, and meanwhile, the back angle is required to be ensured to be 14 degrees +/-5', as shown in figure 11.
S5, installing a cutter bar, aligning a reference surface of the cutter bar by using a dial indicator, installing a cutter block qualified for inspection, and aligning the reference surface of the cutter block by using a special tool to ensure that the reference surface is parallel to the axis of the workpiece.
And (4) placing the tool block which is qualified in the S3 inspection and is turned with the internal thread into an inner hole tool bar of the internal thread workpiece to be turned. The inner hole cutter bar adopts a machine clamping cutter bar, and the cutter block is arranged at the position of the cutter edge 30750 and the cutter setting position, so that the convenience and the trouble are saved. The position of the cutter clamping block is ensured to be vertical and parallel to 90 degrees, and the cutter clamping can be accurate. The knife pad for clamping the knife is assembled and then the knife is clamped tightly, so that the knife block is prevented from being broken. (the fastening mandril and the screw of the cutter bar are arranged at the tail part of the cutter bar, and the cutter holder is firmly connected by a long rod through the center) the quenching hardness HRC 38-42 of the cutter bar (No. 45) is shown in figure 12.
The center, height and height of the cutter block have influence on the thread angle, and a center positioning column can be used for accurately aligning the center, as shown in fig. 13.
And S10, calibrating the vertical and horizontal positions of the knife block by using the knife setting mirror.
The optical tool is used for tool setting of the tool bit, the tool bit is changed from the beginning to the completion, the position of the tool bit after tool setting is always in the position of the central scribed line of the tool setting optical microscope, the size of the middle diameter is 0.01-0.02 mm, and the tool can be changed for continuous tool feeding processing. The accuracy of tool setting is ensured.
The tool setting mirror is arranged on a machine tool supporting plate, vertical parallelism is well found, and a light source is well connected to have a good focus. The eyepiece is adjusted to be correct, so that the cutter block can be correctly arranged to process the workpiece, as shown in fig. 14.
And S11, roughly turning the internal thread of the high-hardness precision workpiece by using the qualified turning internal thread cutter block, namely the internal thread pitch diameter.
The tool point angle of the rough turning tool block is 58 degrees and 48 degrees, rough machining of high-hardness and precise threads is carried out, each time the tool is eaten by 0.05mm, after the workpiece is finished, the formed angle is 60 degrees, and the formed angle of the machined threads after quenching is obtained by accumulated difference of tool block abrasion. During processing, a cutter handle is not required to be dried up, a cutter block is required to be replaced in time, the accuracy of an angle is ensured, the cutter is accurately mounted until the middle diameter size is measured, and an ideal product is obtained. The allowance of the size of the intermediate diameter is 0.1-0.15 mm, then the cutter block is replaced, the thread bottom of the thread is turned, and the large diameter of the internal thread is controlled, so that the diameter of the thread bottom is larger than the stroke diameter of the internal thread by 0.2-0.3 mm.
S12, clamping the large-diameter tool block 8 (namely the thread bottom) to be ground on the hand grinding tool 9, and grinding the large-diameter tool block 8 to be ground to the qualified size by the hand grinding tool 9, as shown in FIG. 15.
Turning an internal thread large-diameter cutter block: the tool sharp angle is 20 +/-5 ', the cutting direction back angle is 4-5', the back angle departing from the cutting direction is 4-5 ', the main back angle is 30 +/-5', the cutting speed Vc can be improved by 20-30% when the thread major diameter (namely the bottom diameter) is turned, because the cutting temperature is increased along with the increase of Vc, the metal at the cutting bottom layer is softened, the shearing strength is reduced, the friction coefficient of a tool and chip interface is reduced, and the deformation coefficient is reduced. Meanwhile, the back angles at two sides can be repaired by diamond oilstone (30750) to facilitate cutting, and the ground primary thread large-diameter cutter block is shown in figure 16.
S13, grinding and finish turning internal thread cutter block
And (5) grinding the sharp angle of the tool block of the internal thread by using the special tool grinding tool assembled in the steps (S1-S6) for finish turning the internal thread, wherein the angle is controlled to be 59-55-60 degrees, and the angle is qualified in projection detection and can be used as shown in figure 17.
Is ensured by a special knife grinding tool. 60-5 'cutting block back angle is 16 +/-5'. The rake angle is 0 deg., and does not affect the median dimension by more than 0.0003mm when the angular tolerance is within 5', as shown in fig. 18.
S14, carrying out finish machining work on the threaded workpiece by using the finish-turning internal thread cutter block detected to be qualified in S13
Turning until the through-through calibration gauge can be provided with a threaded opening, and having a screwing-in feeling (namely the difference between the pitch diameter of the threads and the size of a finished product is 0.02-0.03 mm).
S15, machining threads of grinding core shaft by adopting thread grinding machine
In order to improve the precision of the thread, wave crests and wave troughs generated in the transmission cutting process of any machine tool are eliminated only in the grinding process, so that the precision is improved. Therefore, when the grinding mandrel is machined, the thread pitch, the angle and the accumulated error must be strictly controlled within the tolerance, the angle is ensured to be 59-58-60 degrees, and the working height of the tooth depth must be ensured. For the core shaft made of nodular cast iron, the thread of the core shaft is ground by a thread grinder, and a high-hardness precise internal thread threaded workpiece is in proper loose fit with the grinding core. During grinding, if the 'on-off' calibration gauge for checking the size and the internal thread part are clamped and rotate still, tens of millions of calibration gauges are not screwed hard, the right-handed thread can be reversed by a rubber plate to clamp the outer diameter of the precise internal thread part, and after friction heat generation, the calibration gauges are unscrewed.
The method comprises the following specific steps: a nodular cast iron grinding mandrel 12 and an adjusting compass 11 are sleeved on a tapered fixed core 13, the fixed core 13 is fixed on a four-jaw chuck 10, the tail part of the four-jaw chuck is axially propped tightly by a rotatable tip 14, and the adjusting compass 11 is screwed so that the grinding mandrel 12 is firmly attached to the fixed core 13, as shown in figure 19.
S16, clamping the internal threads of the nodular cast iron grinding mandrel by using a grinding machine tool to grind and finish turning to the finished product size
The finish-turned high-hardness precision threads 15 are sleeved on the grinding mandrel 12, the four-jaw chuck 10 is controlled to rotate forward and backward by a foot switch of the grinding machine, the adjusting compass 11, the grinding mandrel 12 and the fixed core 13 are driven to rotate forward and backward, and the finish-turned internal threads 15 are ground to the finished size, as shown in fig. 20.
The method comprises the following specific steps: in the grinding process, viscous liquid obtained by mixing and stirring engine oil and diamond powder is coated on a nodular cast iron grinding mandrel, and a high-hardness precise internal thread workpiece with turning allowance of 0.02-0.03 is screwed into the grinding mandrel. The pedal switch is used for controlling the main shaft to rotate forward and backward, so that the high-hardness precise internal thread workpiece reciprocates on the grinding mandrel to be ground. And finally, taking down the workpiece, cleaning the workpiece with cleaning oil and detecting the workpiece.
For some precise internal thread parts, the thread buckle head needs to adopt internal grinding to carry out inverted arc treatment, so that the high-hardness precise thread is convenient to use.
S17, chamfering a buckle head of the high-hardness precise internal thread by using an inner hole grinder;
and S18, finishing inspection.
And detecting by adopting an on-on, on-off calibration gauge, and after the detection is qualified, oiling parts for rust prevention treatment.
The checking of the general dimensions should be carried out as much as possible with the use of universal gauges.
And a special measuring tool is adopted for a high-precision and heavy-size clinical laboratory.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A machining method of a hardness precision internal thread is characterized by comprising the following steps:
s1, mounting and fixing special clamps for clamping a tool block with an internal thread to be ground on a main rear tool face and an auxiliary rear tool face of a grinding tool block;
s2, grinding the internal thread cutter block by using a carborundum grinding wheel;
when a blade of a cutter block is ground, the cutter block with internal threads is placed at a 1/2 position of the lower part of the center of a grinding wheel, 1 surface is ground firstly, the tip of the cutter point is removed, 2 surfaces are ground after the corner is formed, and the cutter point removed by grinding on the 1 surface is repaired in grinding; after the cutter block is sharpened, the half angle is checked to be 30-2 'under a tool microscope, the whole angle is 60-5', the cutter block is reground when the cutter block is unqualified, and the tolerance of the intermediate diameter is controlled to be 0.01mm;
s3, carrying out angle inspection on the ground cutter block through a projection measuring instrument;
s4, turning the small diameter of the internal thread by adopting a cutter block for turning the small diameter of the internal thread;
s5, aligning a cutter bar, installing a ground internal thread turning cutter block, aligning a cutter qualified in the S3 inspection to the center by using an optical microscope, roughly turning an internal thread, wherein the allowance of the internal thread pitch diameter is 0.1-0.15 mm;
s6, grinding a sharp cutter of the large-diameter cutter block for turning the threads, and finishing the machining of the bottom diameter of the threads by adopting the cutter block; controlling the bottom diameter of the internal thread to enable the bottom diameter of the internal thread to be larger than the diameter of the internal thread by 0.2-0.3 mm;
s7, adopting an internal thread turning cutter block to finish turning internal threads; the angle of the internal thread turning cutter block for finish turning of the internal thread is controlled to be 59-60 degrees;
s8, grinding the core shaft for grinding the internal thread by using a wire grinder;
and S9, clamping a mandrel by using a grinding machine tool to grind the finish-turned internal thread to a finished product size.
2. The method for processing the hardness precision internal thread according to claim 1, wherein the special fixture for grinding the main and auxiliary rear tool surfaces of the tool block mainly comprises a fixed claw, a pitch angle adjusting disc, an adjusting disc and a base; the cutter block is arranged on the fixed claw which is assembled with the pitching angle adjusting disc; the adjusting disc is arranged on the base and can rotate relative to the base; the pitching angle adjusting disc mainly comprises a clamping hoop, a main back angle adjusting rotary disc, an auxiliary back angle adjusting rotary disc, a fastening screw and a square rotating shaft; the clamp hoop is welded and fixed with the excircle of the main relief angle adjusting turntable, the lower end of the excircle of the auxiliary relief angle adjusting turntable is welded and fixed with the square rotating shaft, the main relief angle adjusting turntable and the auxiliary relief angle adjusting turntable can rotate relatively and are fastened through fastening screws, and the square rotating shaft is vertically inserted into a square groove of the adjusting plate.
3. The machining method of the hardness precision internal thread according to claim 2, wherein the fixed claw mainly comprises a pressing claw, a screw, a spring, a fixed claw base and a rotating shaft; one end of the pressing claw is hinged with the fixed claw base through a rotating shaft; the knife block is placed in the groove of the fixed claw base, and the screw penetrates through the pressing claw to compress the spring downwards, so that the pressing claw presses the knife block.
4. The method of claim 3, wherein the fixing claws are inserted into circular grooves of the clampband in the pitch angle adjustment disk, the fixing claws are rotatable along the inner hole of the clampband, and the clampband is tightened by tightening the fixing claws by tightening the screws.
5. The method as claimed in claim 3, wherein an angle scale and a positioning groove for sliding the positioning block are carved on the top surface of the base.
6. The method for machining the hardness precision internal thread according to claim 2, wherein in S4, a small-diameter cutter block of the internal thread is turned, the main deflection angle is 30 degrees, the main relief angle is 14 degrees +/-5 degrees, so that the radial force is increased and the axial force is reduced, and the cutter point angle is 120 degrees.
7. The method for machining the hardness precision internal thread according to claim 2, wherein in S5, the position of the cutter bar clamping block is ensured to be vertically and horizontally opposite to 90 degrees; when the internal thread is roughly turned, the sharp angle of the turning internal thread cutter block is 58-degree 48', the cutter is 0.05mm each time, the angle formed by the turning internal thread cutter block is 60 degrees after the workpiece is finished, the cutter handle is not needed to be dried up in the machining process, and the cutter block needs to be replaced in time.
8. The method for machining the hardness precision internal thread according to claim 2, wherein in S6, the turning tool point angle of the tool block with the large diameter of the internal thread is 20 degrees plus or minus 5 degrees, the cutting direction back angle is 4 degrees plus or minus 5 degrees, the back angle away from the cutting direction is 4 degrees plus or minus 5 degrees, the main back angle is 30 degrees plus or minus 5 degrees, and the cutting speed can be improved by 20 to 30 percent when the thread with the large diameter is turned.
9. The method for machining the hardness precision internal thread according to claim 2, wherein when the internal thread is finely turned, the turning to the on-off calibration gauge can be provided with a thread opening part, and the screw has a screwing-in feeling.
10. The method for processing the hardness precision internal thread according to claim 2, wherein a core shaft made of nodular cast iron is adopted, and the thread is ground by a thread grinder; a nodular cast iron grinding mandrel 12 and an adjusting compass 11 are sleeved on a tapered fixed core 13, the fixed core 13 is fixed on a four-jaw chuck 10, the tail part of the fixed core is axially propped tightly by a rotatable centre 14, the adjusting compass 11 is screwed to ensure that the grinding mandrel 12 is firmly attached to the fixed core 13, viscous liquid mixed and stirred by engine oil and diamond powder is coated on the nodular cast iron grinding mandrel, a high-hardness precise thread 15 with turning allowance of 0.02-0.03 after finish turning is sleeved on the grinding mandrel 12, the four-jaw chuck 10 is controlled to rotate forwards and backwards by a foot switch of the grinding machine to drive the adjusting compass 11, the grinding mandrel 12 and the fixed core 13 to rotate forwards and backwards, and the internal thread 15 after finish turning is ground to reach the finished size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211336834.0A CN115722737B (en) | 2022-10-28 | 2022-10-28 | Machining method of precise hardness internal thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211336834.0A CN115722737B (en) | 2022-10-28 | 2022-10-28 | Machining method of precise hardness internal thread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115722737A true CN115722737A (en) | 2023-03-03 |
| CN115722737B CN115722737B (en) | 2024-04-09 |
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| CN206230384U (en) * | 2016-12-09 | 2017-06-09 | 方牛数控科技（常州）有限公司 | A kind of milling cutter special jig for grinding for hard alloy |
| CN110977773A (en) * | 2019-12-30 | 2020-04-10 | 北京市电加工研究所 | Online dressing device and process for diamond grinding wheel of tool grinder |
| CN113478186A (en) * | 2021-08-26 | 2021-10-08 | 齐齐哈尔建华机械有限公司 | Machining method of slender threaded workpiece |
| CN216883006U (en) * | 2022-02-21 | 2022-07-05 | 哈尔滨商业大学 | Knife grinder for turning tool |
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2022
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| GB1027560A (en) * | 1965-03-02 | 1966-04-27 | De Vlieg Machine Co | Improved grinding fixture for the grinding of spade drills |
| GB2021454A (en) * | 1978-04-27 | 1979-12-05 | Banner A H | Device for use in the machining of a screw thread or grooves on a workpiece |
| US4930265A (en) * | 1984-08-28 | 1990-06-05 | Schaudt Maschinenbau Gmbh | Thread grinding method and machine |
| CN87205995U (en) * | 1987-04-06 | 1988-12-21 | 陕西省清华机电研究所 | Lathe tool used for processing gage and special shape surface |
| JP2005193365A (en) * | 2004-01-08 | 2005-07-21 | Tsukushi Seisakusho:Kk | End mill cutting edge grinding jig |
| CN2915362Y (en) * | 2006-06-23 | 2007-06-27 | 庄添财 | Four-head knife sharpener |
| CN101020264A (en) * | 2007-01-25 | 2007-08-22 | 祁宝栋 | Thread turning process |
| CN102554578A (en) * | 2012-02-17 | 2012-07-11 | 东方电气集团东方电机有限公司 | Production method for large-diameter fine thread part |
| CN203109387U (en) * | 2012-10-23 | 2013-08-07 | 广西华银铝业有限公司 | Automatic tapping device for lathe |
| CN204148964U (en) * | 2014-10-27 | 2015-02-11 | 哈尔滨东安汽车发动机制造有限公司 | A kind of multi-angle tool sharpening device |
| CN206230384U (en) * | 2016-12-09 | 2017-06-09 | 方牛数控科技（常州）有限公司 | A kind of milling cutter special jig for grinding for hard alloy |
| CN110977773A (en) * | 2019-12-30 | 2020-04-10 | 北京市电加工研究所 | Online dressing device and process for diamond grinding wheel of tool grinder |
| CN113478186A (en) * | 2021-08-26 | 2021-10-08 | 齐齐哈尔建华机械有限公司 | Machining method of slender threaded workpiece |
| CN216883006U (en) * | 2022-02-21 | 2022-07-05 | 哈尔滨商业大学 | Knife grinder for turning tool |
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| CN115722737B (en) | 2024-04-09 |
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