CN109366102A - A kind of snap ring processing technology - Google Patents
A kind of snap ring processing technology Download PDFInfo
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- CN109366102A CN109366102A CN201811329911.3A CN201811329911A CN109366102A CN 109366102 A CN109366102 A CN 109366102A CN 201811329911 A CN201811329911 A CN 201811329911A CN 109366102 A CN109366102 A CN 109366102A
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- snap ring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The present invention provides a kind of snap ring processing technology, and the both ends of single-piece snap ring are extended in opposite directions and are connected, full circle is enclosed；A hollow circuit cylinder is forged according to full circle diameter；Rough turn hollow circuit cylinder carries out ultrasonic examination after obtaining snap ring blank, meets heat treatment after flaw detection requires and eliminates forging stress；Smart car snap ring blank, in the surface turning square thread of hollow circuit cylinder；Snap ring is cut along lathe tool scratch, obtains the spiral surface single-piece snap ring that several shapes are full circle；Milling is carried out to single-piece snap ring using numerical control mill；The helicoid of two single-piece snap rings is constituted into snap ring assemblies relatively, is bonded with bond pad integral；Ensure two snap ring screw head consistency of thickness by being ground repeatedly；Wire cutting finally is carried out to snap ring.The present invention can reduce machining deformation, improve accurate to dimension, to realize the Precision Machining molding of thin-walled snap ring.
Description
Technical field
The invention belongs to precise machine machining fields, are related to a kind of Precision Machining moulding process skill of high strength steel
Art.
Background technique
Check ring joint structure is mainly used on solid propellant rocket, the connection for shell and end socket, jet pipe；Also may be used
For the connection of other kinds product, application prospect is extensive.
Certain model motor combustion chamber case is connect with jet pipe using snap ring, and snap ring is snap ring sub-assembly, and faying face uses
Spiral-shaped structure.Single-piece snap ring uses in pairs, and mutually head and the tail cooperate, and snap ring sub-assembly schematic diagram is shown in Fig. 1, single-piece snap ring schematic diagram
See Fig. 2.
Snap ring material generally selects 30CrMnSiA or 20 steel, and hardness is modulation or normalizing state (HRC35~40), shape ruler
It is very little: outer diameter 300mm~500mm (dimensional tolerance about 0.02mm~0.10mm), thickness 3mm~6mm, width maxima and minima
Gap is big, is not attached to (spacing about 30mm~80mm) from beginning to end, is approximately round spiral surface for Open architecture, docking style face,
General mark is high (verticality about 0.02mm~0.06mm) with reference to the verticality of spiral angle value, end face and outer circle.Snap ring is in groups
After cooperation, width dimensions tolerance
Snap ring docking style face is approximately the spiral surface of a circle, and NC Milling can be used in docking style face, and numerical control mill need to be adopted
It is processed with 5 axis machining centers, workpiece rotation is synchronized with milling cutter feeding, and processing program establishment is complicated, to craftsmanship
It is required that it is high, operation difficulty is big, and is once only capable of processing single-piece snap ring, when processing, will guarantee the reliability of milling, need to leave and take technique
Collet, collet should have enough rigidity, will cause the deformation of snap ring to guarantee clamping not, influence milling quality, technique collet
Length is much larger than snap ring machining area length, causes very big waste, economy is bad.
The snap ring of the complete spiral surface of NC Milling needs to separate from technique collet, guarantees snap ring head and the tail width
Size, and guarantee card single-piece ring originally in groups cooperate after width dimensions toleranceAccording to NC Milling, because of snap ring tail portion
Width is small, and Milling Machining easily causes the buckling deformation of snap ring tail portion, even if numerical control mill separates snap ring reluctantly, snap ring is wide after cooperating in groups
Spend dimensional toleranceEasily it cannot be guaranteed that, the snap ring of processing can not achieve smooth assembly, and snap ring cannot use.
In conclusion high-strength thin-walled snap ring processing is limited to Open architecture, poor, the free state dimensionally stable of rigidity
Property is poor, and single-piece snap ring machining deformation is big, and snap ring is in groups in use, there are uneven gaps in fitting-type face, and mating surface is by face contact
Become line contact, reduces the use intensity of snap ring；The deformation of snap ring stress rear profile face is also resulted in, it is many to influence disassembly of snap ring etc.
Problem.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of snap ring processing technology, can reduce processing and become
Shape improves accurate to dimension, to realize the Precision Machining molding of thin-walled snap ring.
The technical solution adopted by the present invention to solve the technical problems the following steps are included:
1) both ends of single-piece snap ring are extended in opposite directions and is connected, enclose full circle；It is hollow according to full circle diameter forging one
Cylinder；
2) rough turn hollow circuit cylinder carries out ultrasonic examination after obtaining snap ring blank, meets to be heat-treated after flaw detection requires and eliminate
Forging stress；
3) smart car snap ring blank, the specific steps are as follows: choose the width of snap ring both ends joint extended in opposite directions as tooth
Shape width, using the width of screw thread grooving cutter as alveolus width, using the sum of thread form width and alveolus width as turning screw pitch,
The surface turning square thread of hollow circuit cylinder；By the extension distance at the most narrow place of snap ring as the chord length since screw head 0mm point, use
Slide calliper rule find the point on spiral shell tail, pass through the groove of the point along axial standardized item in snap ring blank surface；
4) snap ring is cut along lathe tool scratch, obtains the spiral surface single-piece snap ring that several shapes are full circle；
5) milling is carried out to single-piece snap ring using numerical control mill, leaves and takes the grinding allowance of 0.3~0.5mm；
6) helicoid of two single-piece snap rings is constituted into snap ring assemblies relatively, single-piece snap ring acetone or ethyl acetate are cleaned
Completely, two single-piece snap rings are bonded to integral, the helicoid of single-piece snap ring in two single-piece snap ring outboard sidewalls with bond pad
Not gluing；Room temperature curing 4 hours or more；
7) the upper plane of two integral single-piece snap rings of grinding ring bonding is milled to screw head, light-exposed at spiral shell tail docking；It turns
Another side is ground after up and down direction；It turns repeatedly, it is desirable that two snap ring screw head consistency of thickness；
8) wire cutting is carried out along the groove that step 3) provides；
9) connecting hole is bored in snap ring Luo Weichu.
The hollow circuit cylinder length of the step (1) is greater than 8 times of snap ring maximum width.
In the step 3), when clamping screw thread grooving cutter, knife bar center line is parallel with machining direction, guarantees knife bar overall length
Range jerk value is within 0.01mm；Keep threading tool feeding vertical with excircle of workpiece.
In the step 3), the inner hole of hollow circuit cylinder, inner hole made allowance 3mm~4mm are first processed；Outer circle is reprocessed, to
After Excircle machining, screw pitch cutting thread is pressed with screw thread grooving cutter, the depth of thread is less than 0.05~0.10mm of snap ring thickness, examines screw thread
Depth reprocesses inner hole after qualified.
In the step 3), after thread turning, before inner hole turning, setting tooling is assembled in outer circle, by outer circle
It uses restraint, workpiece when turning inner hole is avoided to deform.
Compensation block is placed in two integral single-piece snap ring lower end surfaces of bonding in affiliated step 6), it is ensured that snap ring axis
It is vertical with end face.
The beneficial effects of the present invention are:
(1) using the method in turning square thread processing clasp-type face, it is ensured that the tightness that snap ring cooperates in groups, card
Ring helicoid cooperates precision high, and bearing capacity is big, uniform force, deforms small after assembly, is easy to the secondary dismounting of snap ring, reuses.
(2) snap ring blanks can time processing go out 6~8 single-piece snap rings, constitute 3~4 pairs of snap ring assemblies, processing effect
Rate is high, and consistency is good.
(3) in smart car, snap ring groove depth leaves and takes surplus, and after inner hole turning in place, snap ring still links together, will not
There is snap ring to be scattered, twines knife, crushing knife phenomenon, cause personnel, equipment damage, process safety is good.
(4) smart car process increases turning tool, snap ring blank rigidity is improved, in turning after the completion of outer diameter turning
Kong Shi is reduced the deformation of snap ring turning, is improved the wall thickness machining accuracy of snap ring due to the limitation of tooling, constraint.
(5) numerical control mill process removes big machining allowance, substantially reduces grinder sequence process time, improves snap ring and add
Work efficiency rate.
(6) 2 single-piece snap rings are combined into one, snap ring is indirectly increased using bond pad by bonding process
Rigidity creates condition for the Precision Machining of snap ring.
(7) it is processed by grinder sequence, upper and lower ends Even Grinding, can accurately guarantee snap ring group width dimensions tolerance, product
Qualification rate is guaranteed.
(8) by linear cutter, screw head, spiral shell tail size and snap ring notch size precision be can effectively ensure that.After cutting,
Snap ring loses constraint, and notch will appear expansion phenomenon, and notch size can not detect, the snap ring clout under being cut by detection,
Guarantee notch size indirectly.
Detailed description of the invention
Fig. 1 is snap ring sub-assembly three-dimensional view；
Fig. 2 is single-piece snap ring schematic diagram；
Fig. 3 is bonded structure schematic diagram；
Fig. 4 is upper (lower) Snap ring structure schematic diagram；
Fig. 5 is snap ring assemblies structural schematic diagram.
Fig. 6 is snap ring processing process figure of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
As shown in fig. 6, snap ring processing process provided by the invention the following steps are included:
1) forging clasp blank, each snap ring blank can be considered by 3~4 vice card ring sub-assemblies of processing；
2) rough turn shape, size should meet flaw detection and require, and take into account the harden ability of heat treatment；
3) ultrasonic examination meets the requirement of GB/T6402-2008 " steel forging material supersonic testing method " 4 grade standards；
4) HRC35~40 are heat-treated, when heat treatment should eliminate as much as forging stress, should also control the heat treatment of snap ring blank
Deformation, shaping tooling can be used when necessary and be subject to school shape；
5) smart car: snap ring docking style face is approximately the spiral surface of a circle, processes docking using the method for vehicle square thread
Type face is mainly the cutting position of determining square thread screw pitch and cut-out point.Screw pitch has only been determined, could accordingly determine and cut
Knife size；The position of cut-out point has been determined, can just cut out the spiral surface of a complete circle；This addresses the problem snap ring spiral shapes
Face formation problems.
The selection of square thread screw pitch, the selection of cut-out point and smart car points for attention etc. are carried out specifically below
It is bright:
5.1) selection of screw pitch
Single-piece snap ring has widest point and the narrowest point, and two o'clock separates, and is separated by a certain distance.Connect if two o'clock extended to
Place, is merged into full circle, can calculate widest point and the narrowest point, can choose turning screw pitch according to widest point size is calculated.In order to
Guarantee turning tooth form width, selected screw pitch should be as far as possible close to tooth form width, it is contemplated that the intensity and stiffness of grooving cutter, in conjunction with vehicle
Bed screw pitch specification, alveolus width can choose within the scope of 2~4mm, tooth form width with calculating widest point size, tooth form width+
Alveolus width=square thread screw pitch.
5.2) selection of cut-out point
The tooth form width of square thread, ensure that the most wide size of snap ring, but guarantee the narrowest point size it is necessary to from spiral shell
This point is found on the head of line.Screw head 0mm point is calculated first to the chord length of the narrowest point size, finds this on spiral shell tail with slide calliper rule
Point makees a label with its width of slide calliper rule amount；
It with the lateral standardized groove of point of a knife, draws always on the most wide size face of tooth form, is cut in subsequent wire cutting process along scribing line
It is disconnected, that is, it can guarantee snap ring widest point and the narrowest point size.
5.3) smart car points for attention
When clamping screw thread grooving cutter, lathe tool knife bar center line should be parallel with machining direction.Use dial gauge centering lathe tool knife
Bar guarantees within knife bar length range jerk value 0.01mm.Keep threading tool feeding vertical with excircle of workpiece, guarantee uses in groups
When the compactness of the mating surface and interchangeability of subsequent assembly.
When smart car, inner hole, inner hole made allowance 3mm~4mm should be first processed.Outer circle is reprocessed, guarantees outer diameter tolerance size.To
After Excircle machining, screw pitch cutting thread is pressed with grooving cutter, the depth of thread should be less than snap ring thickness 0.05mm~0.10mm, clinic inspection
The depth of thread is tested, reprocesses inner hole after qualified.
The depth of thread must be processed strictly by technique requirement, can be guaranteed in this way after inner hole is processed in place, theoretically
Snap ring should be interconnected on one.Even if workpiece is locally deformed with, snap ring can also guarantee that big portion is connected with each other, covert to increase
Workpiece rigidity, conducive to the machine addition shape of snap ring.
When to avoid inner hole vehicle to design requirement size, workpiece is deformed due to losing constraint, influences the processing of inner hole
Quality can twine knife, crushing knife phenomenon, cause safety accident when serious, therefore after thread turning is complete, before inner hole turning, outside
Circle assembly setting tooling, outer circle is used restraint, and is avoided workpiece when turning inner hole from deforming, is influenced snap ring thickness precision.
6) wire cutting: snap ring is cut along lathe tool scratch, obtains the spiral surface single-piece snap ring an of complete circle；
7) numerical control mill: after single-piece snap ring cooperates in groups, width is simultaneously unsatisfactory for design requirement, needs to carry out non-helical face
Processing, if directly carrying out grinding process, processing capacity is big, economical bad, and numerical control mill can be used, cooperate necessary milling tool,
Milling is carried out to single-piece snap ring, leaves and takes 0.3mm~0.5mm grinding allowance.
8) it is bonded: the upper snap ring of snap ring assemblies, the lower snap ring cotton yarn for dipping in proper amount of acetone or ethyl acetate is scrubbed,
It is integral by Fig. 3 bonding with WD1001 bonded adhesives.Pay attention to up and down snap ring faying face must not gluing, highest point (thickness) end face
Should be with snap ring screw head, spiral shell tail central symmetry, and it is close to finger pressure a moment；Centering makes snap ring surfaces externally and internally and plane perpendicular, i.e. snap ring
Axle center and plane perpendicular；The inner and outer surfaces of snap ring are pasted with the block of long 10~15mm, inner and outer surfaces are uniformly bonded 8~10 respectively
Block, it is desirable that bonding is secured.Bonding snap ring assemblies are placed horizontally on platform, are pressurizeed above with briquetting, room temperature curing 4 is small
When more than；
9) be ground: on the basis of snap ring one side, plane on mill is milled to screw head, light-exposed at spiral shell tail docking.U-turn, mill
Another side, thickness at the upper and lower snap ring screw head of random measurement, it is desirable that upper and lower snap ring screw head size should be consistent.This process needs repeatedly
U-turn, Even Grinding, when grinding, need to guarantee that snap ring axis is vertical with end face, i.e., processing when use dial gauge centering outer circle opposite at random
The verticality of Grinder bench carries out normality compensation to snap ring with clearance gauge when necessary, it is ensured that verticality is not more than 0.03mm, protects
Demonstrate,prove thickness tolerance
10) wire cutting: by wire cutting in snap ring group, screw head is found out, at spiral shell tail docking, wire cutting guarantees the most wide of snap ring
Point and the narrowest point size；
11) clamp: snap ring Luo Weichu bores connecting hole；
12) it marks: laser labelling.
It is now illustrated for snap ring by certain model engine, snap ring material selection: 30CrMnSiA, hardness: HRC35
~40, outer diameterInner holeWidth maximum value 13mm, minimum value 1mm, head and the tail spacing 50mm, docking
The verticality 0.03mm of type surface helix angle value (27.4 '), end face and outer circle, overall width after upper and lower snap ring cooperation
Upper (lower) Snap ring structure is shown in that Fig. 4, snap ring assemblies are shown in Fig. 5.
(1) it is processed using snap ring processing process:
(2) forging blank size: ￠ 510mm × ￠ 470mm × 260mm.
(3) rough turn, flaw detection.
(4) it is heat-treated: HRC35~40.
(5) CW6180C lathe is selected, selection square thread screw pitch is 16mm, takes the wide 13.2mm of tooth form, the wide 2.8mm of alveolus.
(6) screw head 0mm point is calculated to the chord length of 0.8mm, finds this point on spiral shell tail with slide calliper rule, with its width of slide calliper rule amount
0.8mm makees a label；It with the lateral standardized groove of point of a knife, draws always on the face tooth form 13.2mm, in subsequent wire cutting process along drawing
Line cutting, that is, can guarantee snap ring widest point 13.2mm, the narrowest point 0.8mm.
(7) when smart car, internal diameterIt is processed by ￠ 480mm.Outer circle is reprocessed, guarantees outer diameter
After Excircle machining, screw pitch 16mm cutting thread, the depth of thread are pressed with width 2.8mm grooving cutterClinical examination screw thread is deep
Degree reprocesses inner hole after qualified.
(8) linear cutter is cut along scribing line, obtains a complete circle snap ring.
(9) NC Milling leaves and takes 0.3mm~0.5mm surplus.
(10) it being bonded, single-piece snap ring head and the tail cooperate, and bonding is integral in groups,.
(11) it is ground snap ring, guarantees width
(12) wire cutting, along snap ring head and the tail abutment joint, both sides respectively deviate 25mm cutting, guarantee size 50mm, take into account size
13mm、1mm。
(13) deburring, snap ring deburring, drilling.
(14) it marks.
According to the snap ring that process above method is processed, through examining, size meets pattern requirement, installation, disassembly convenience, snap ring
It smoothly realizes and reuses, when especially suitable for the water pressure test, assembly, the disassembly of multiple shells and hydraulic pressure tooling are given full play to
The advantage of snap ring is gone out.
Claims (6)
1. a kind of snap ring processing technology, it is characterised in that include the following steps:
1) both ends of single-piece snap ring are extended in opposite directions and is connected, enclose full circle；A hollow circuit cylinder is forged according to full circle diameter；
2) rough turn hollow circuit cylinder carries out ultrasonic examination after obtaining snap ring blank, meets heat treatment after flaw detection requires and eliminates forging
Stress；
3) smart car snap ring blank, the specific steps are as follows: the width for choosing snap ring both ends joint extended in opposite directions is wide as thread form
Degree, using the width of screw thread grooving cutter as alveolus width, using the sum of thread form width and alveolus width as turning screw pitch, hollow
The surface turning square thread of cylinder；By the extension distance at the most narrow place of snap ring as the chord length since screw head 0mm point, slide calliper rule are used
The point is found on spiral shell tail, passes through the groove of the point along axial standardized item in snap ring blank surface；
4) snap ring is cut along lathe tool scratch, obtains the spiral surface single-piece snap ring that several shapes are full circle；
5) milling is carried out to single-piece snap ring using numerical control mill, leaves and takes the grinding allowance of 0.3~0.5mm；
6) helicoid of two single-piece snap rings is constituted into snap ring assemblies relatively, single-piece snap ring acetone or ethyl acetate are cleaned dry
Only, in two single-piece snap ring outboard sidewalls that two single-piece snap ring bondings are integral with bond pad, the helicoid of single-piece snap ring is not
Gluing；Room temperature curing 4 hours or more；
7) the upper plane of two integral single-piece snap rings of grinding ring bonding is milled to screw head, light-exposed at spiral shell tail docking；It turns up and down
Another side is ground behind direction；It turns repeatedly, it is desirable that two snap ring screw head consistency of thickness；
8) wire cutting is carried out along the groove that step 3) provides；
9) connecting hole is bored in snap ring Luo Weichu.
2. snap ring processing technology according to claim 1, it is characterised in that: the hollow circuit cylinder of the step (1) is long
Degree is greater than 8 times of snap ring maximum width.
3. snap ring processing technology according to claim 1, it is characterised in that: in the step 3), clamping screw thread
When grooving cutter, knife bar center line is parallel with machining direction, guarantees knife bar length range jerk value within 0.01mm；Make screw thread vehicle
Knife feeding is vertical with excircle of workpiece.
4. snap ring processing technology according to claim 1, it is characterised in that: in the step 3), first in processing
The inner hole of hollow round column, inner hole made allowance 3mm~4mm；Outer circle is reprocessed, after Excircle machining, presses screw pitch vehicle with screw thread grooving cutter
Screw thread, the depth of thread are less than 0.05~0.10mm of snap ring thickness, examine the depth of thread, reprocess inner hole after qualified.
5. snap ring processing technology according to claim 1, it is characterised in that: in the step 3), in screw thread vehicle
After cutting, before inner hole turning, setting tooling is assembled in outer circle, outer circle is used restraint, workpiece when turning inner hole is avoided to deform.
6. snap ring processing technology according to claim 1, it is characterised in that: in bonding at one in affiliated step 6)
Place compensation block in two single-piece snap ring lower end surfaces of body, it is ensured that snap ring axis is vertical with end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329911.3A CN109366102A (en) | 2018-11-09 | 2018-11-09 | A kind of snap ring processing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811329911.3A CN109366102A (en) | 2018-11-09 | 2018-11-09 | A kind of snap ring processing technology |
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| CN109366102A true CN109366102A (en) | 2019-02-22 |
Family
ID=65384132
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| CN201811329911.3A Pending CN109366102A (en) | 2018-11-09 | 2018-11-09 | A kind of snap ring processing technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532313A (en) * | 2021-06-07 | 2021-10-22 | 上海新力动力设备研究所 | Method for designing machining standard of combustion chamber shell |
| CN113547285A (en) * | 2021-06-18 | 2021-10-26 | 马鞍山方圆精密机械有限公司 | Method for machining multi-section ultrathin annular piece |
| CN114986103A (en) * | 2022-07-01 | 2022-09-02 | 中裕铁信交通科技股份有限公司 | Processing technology of annular damper |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532313A (en) * | 2021-06-07 | 2021-10-22 | 上海新力动力设备研究所 | Method for designing machining standard of combustion chamber shell |
| CN113547285A (en) * | 2021-06-18 | 2021-10-26 | 马鞍山方圆精密机械有限公司 | Method for machining multi-section ultrathin annular piece |
| CN113547285B (en) * | 2021-06-18 | 2023-08-29 | 马鞍山方圆精密机械有限公司 | Method for processing multi-section ultrathin annular piece |
| CN114986103A (en) * | 2022-07-01 | 2022-09-02 | 中裕铁信交通科技股份有限公司 | Processing technology of annular damper |
| CN114986103B (en) * | 2022-07-01 | 2023-09-22 | 中裕铁信交通科技股份有限公司 | Processing technology of annular damper |
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Application publication date: 20190222 |