CN114248064B - Manufacturing method of high-stability strong torsion bar spring - Google Patents
Manufacturing method of high-stability strong torsion bar spring Download PDFInfo
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- CN114248064B CN114248064B CN202010995528.2A CN202010995528A CN114248064B CN 114248064 B CN114248064 B CN 114248064B CN 202010995528 A CN202010995528 A CN 202010995528A CN 114248064 B CN114248064 B CN 114248064B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a manufacturing method of a torsion bar spring, and belongs to the technical field of spring processing. The invention solves the problems of extremely high rejection rate and low working reliability of the existing products. The method comprises the following steps: step one: selecting bars, and step two: rough turning forming and step three: heat treatment, step four: fine grinding and step five: preforming pier heads, namely: and (c) primary heating pretwisting-detecting, namely, step seven: and (8) a secondary heating pretwisting-detecting step: heat aging, step nine: pier head forming, and step ten: and (5) finished product inspection. The dumbbell-shaped polished rod is formed into a torsion bar spring, the torsion bar pretwisting reinforcement manufacturability is improved through twice heating gradient pretwisting treatment, the breakage probability of the torsion bar in the pretwisting process is greatly reduced, the pretwisting reinforcement speed is accelerated, the manufacturing efficiency is improved, the torsion force value is improved through twice heating gradient pretwisting reinforcement, the torsion force value can be improved, and the torsion bar spring is simple and efficient in manufacturing and high in reliability.
Description
Technical Field
The invention relates to a manufacturing method of a torsion bar spring, and belongs to the technical field of spring processing.
Background
The torsion bar spring itself is a torsion bar made of spring steel, and the section of the torsion bar is usually round, and a few are tubular and rectangular. The existing torsion bar spring process scheme comprises bar material, rough turning forming, heat treatment, fine grinding, pier head forming, pre-twisting strengthening, finished product inspection and warehousing, wherein the spring steel bar is adopted for mechanical machining rough forming, the heat treatment is used for improving the hardness and strength of materials, the diameter precision requirement of the middle rod part is ensured through grinding, and the pre-twisting strengthening is carried out after the hexagonal forming of the two ends, so that the torsion direction stability is improved.
The torsion bar spring manufactured by the prior art is only suitable for small torsion angles, small torsion values and low torque stability requirements, and aiming at the conditions that the torsion bar spring with large torsion angle and strong torque requirements is manufactured by adopting the prior art, the residual torsion angle is too large, the torsion bar spring is broken in the torsion bar process, the torque cannot meet the requirements, and the like, the ends of the torsion bar spring are provided with larger torsion angle deviation, the torsion bar spring is subjected to negative angle deviation after being placed for a period of time in an empty load state, the torque is reduced, and the like, so that the manufacturing cost of the torsion bar spring is too high, the rejection rate is extremely high by more than about 70%, the functionality is unstable, the torque value cannot meet the use requirements, and the like.
Based on the above-mentioned problems, there is a need to provide a method for manufacturing a high-stability strong torsion bar spring to solve the above-mentioned technical problems.
Disclosure of Invention
The invention provides a manufacturing method of a high-stability strong torsion bar spring, which solves the problems of extremely high rejection rate and low working reliability of the existing product. The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention.
The technical scheme of the invention is as follows:
a manufacturing method of a high-stability strong torsion bar spring comprises the following steps: step one: selecting a bar;
step two: rough turning forming
Clamping the bar on a lathe, wherein the lathe is used for clamping and turning the bar twice, processing the bar into a dumbbell-shaped polished rod, and grinding center holes at two ends of the dumbbell-shaped polished rod;
step three: heat treatment of
Carrying out heat treatment on the dumbbell-shaped polished rod, wherein the dumbbell-shaped polished rod is placed in a hanging mode in the heat treatment process, and the dumbbell-shaped polished rod reaches specified hardness after the heat treatment;
step four: fine grinding
The dumbbell-shaped polished rod is clamped by double centers, a center frame is arranged in the middle to support the dumbbell-shaped polished rod, and a grinding wheel is used for finely grinding the dumbbell-shaped polished rod;
step five: pier head preforming
Adopting linear cutting equipment to process and preform the two end heads of the dumbbell-shaped polished rod;
step six: one-time heating pretwisting
The torsion angle of the dumbbell-shaped polished rod is adjusted to 80 degrees+/-1 degrees, a torsion tool is adopted for heating pre-torsion, torsion force is applied to preformed ends at two ends of a torsion bar spring through flat holes at two ends of the tool, the torsion angle is judged through a flower disc on the tool, locking and fixing are carried out through a positioning screw, the temperature is slowly increased to 110 ℃, the temperature is kept for 2 hours, the furnace is cooled, and the residual deformation angle is recorded after unloading;
step seven: secondary heating pretwisting
Twisting the steel plate again to 90 degrees+/-1 degrees, slowly heating to 110 ℃, keeping the steel plate for 2 hours, cooling along with a furnace, unloading and recording the residual deformation angle; judging that the residual deformation angle difference is not larger than the design requirement value after two continuous treatments, and forming the dumbbell-shaped polished rod into a torsion bar spring;
step eight: thermal ageing
The torsion bar spring is placed into a thermal aging furnace in an idle load way, the temperature is slowly raised to 180 ℃ to 200 ℃, the temperature is kept for 2 hours, and the torsion bar spring is cooled along with the furnace;
step nine: pier head forming
Adopting linear cutting equipment and a special tool, enabling an inner sleeve to be wrapped with a torsion bar spring and then penetrate into an outer tool together, adopting a set screw to press the inner sleeve tool and the torsion bar spring, utilizing a hexagonal overturning tool to conduct angle positioning, and processing the outer end of a pier head by the linear cutting equipment, wherein the outer end of the pier head is formed in a positive hexagonal manner;
step ten: finished product detection
And finishing the diameter of the torsion bar spring and the hexagonal position tolerance at the two ends, and adopting an outside micrometer to finish manual diameter detection and form and position tolerance measurement by a three-coordinate measuring machine.
Step eleven: and (5) warehousing.
Preferably: in the first step, the bar material with the diameter phi of 12mm and the length of 350mm is selected, and the material composition is 60Si2 CrVA.
Preferably: and in the second step, the turning rotating speed is 300 revolutions per minute, the cutting depth of each cutter is 0.6mm, the diameter phi of the dumbbell-shaped polished rod is 8.5mm, the length is 304mm, the total length is 344mm, the straightness is less than 0.5mm, and the diameter grinding allowance of the dumbbell-shaped polished rod is 1.5mm.
Preferably: and thirdly, the heat treatment temperature is 850 ℃, the oil quenching is 410 ℃, the tempering is carried out, and the hardness after the heat treatment is 47-51 HRC.
Preferably: and in the fourth step, the grinding wheel is 80 meshes, and the diameter of the polished rod part of the dumbbell-shaped polished rod after fine grinding is phi 7mm and the length is 302mm.
Preferably: in the fifth step, the feeding depth of the outer end cutting of the pier head is 8mm, the outer end of the pier head is square, a chamfer with R10.5 is machined at the connecting part of the pier head and the polished rod, the inner side of the pier head is in a circular truncated cone shape, and the included angle between the side wall of the circular truncated cone and the axis is 15 degrees.
Preferably: the tool for realizing torsion of the torsion bar spring comprises a flat hole limiting block, a flower disc, a positioning screw, a main body and a base, wherein the upper end of the base is connected with the main body, the torsion bar spring is installed in the main body, the base and the flower disc are fixedly installed with the flat hole limiting block, the upper end and the lower end of the torsion bar spring are connected with the base and the flower disc through the flat hole limiting block, the upper end of the main body is provided with a positioning disc which is fixedly connected with the main body, and the positioning disc is connected with the flower disc through the positioning screw.
Preferably: the flat hole limiting block is square and is connected with the outer end of the pier head of the torsion bar spring.
Preferably: the tool for realizing the regular hexagonal machining of the pier head comprises an inner sleeve, an outer side and a set screw, wherein the torsion bar spring is arranged in the inner sleeve, the pier heads at two ends of the torsion bar spring are arranged outside the inner sleeve, the inner sleeve is arranged in the outer side, the set screw is in threaded connection with the outer side and tightly props the inner sleeve, and the outer side is in a regular hexagon shape.
The invention has the following beneficial effects:
1. after molding, heating aging treatment is carried out according to the use temperature, and unstable residual internal stress is released, so that the use stability is greatly improved, and the product percent of pass is improved by 300%;
2. the method is simple, low in cost and easy to implement, and the manufacturing efficiency is improved;
3. the dumbbell-shaped polished rod is molded into a torsion bar spring, the torsion bar pretwisting reinforcement manufacturability is improved through twice heating gradient pretwisting treatment, the breaking probability of the torsion bar in the pretwisting process is greatly reduced, the pretwisting reinforcement speed is accelerated, the manufacturing efficiency is improved, and in addition, the torsion value is improved through twice heating gradient pretwisting reinforcement, so that the torsion value can be improved;
4. the stability can be greatly improved.
Drawings
FIG. 1 is a schematic diagram of a torsion bar spring pre-torsion tooling structure;
FIG. 2 is a schematic diagram of rough turning;
FIG. 3 is a schematic diagram of finish forming;
FIG. 4 is a schematic view of a torsion bar spring configuration;
fig. 5 is a hexagonal wire cutting forming tool.
In the figure, a 1-flat hole limiting block, a 2-flower disc, a 3-set screw, a 4-main body, a 5-base, a 6-inner sleeve and a 7-outer and 8-set screw are arranged.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by means of specific embodiments shown in the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The connection mentioned in the present invention is divided into a fixed connection and a detachable connection, wherein the fixed connection (i.e. the non-detachable connection) includes, but is not limited to, a conventional fixed connection manner such as a hemmed connection, a rivet connection, an adhesive connection, a welded connection, etc., and the detachable connection includes, but is not limited to, a conventional detachable manner such as a threaded connection, a snap connection, a pin connection, a hinge connection, etc., and when the specific connection manner is not specifically limited, at least one connection manner can be found in the existing connection manner by default, so that the function can be realized, and a person skilled in the art can select the connection according to needs. For example: the fixed connection is welded connection, and the detachable connection is hinged connection.
The first embodiment is as follows: the method for manufacturing the high-stability strong torsion bar spring according to the present embodiment will be described with reference to fig. 1 to 5, and includes the steps of:
step one: selecting a bar;
step two: rough turning forming
Clamping the bar on a lathe, wherein the lathe is used for clamping and turning the bar twice, processing the bar into a dumbbell-shaped polished rod, and grinding center holes at two ends of the dumbbell-shaped polished rod;
step three: heat treatment of
Carrying out heat treatment on the dumbbell-shaped polished rod, wherein the dumbbell-shaped polished rod is placed in a hanging mode in the heat treatment process, and the dumbbell-shaped polished rod reaches specified hardness after the heat treatment;
step four: fine grinding
The dumbbell-shaped polished rod is clamped by double centers, a center frame is arranged in the middle to support the dumbbell-shaped polished rod, and a grinding wheel is used for finely grinding the dumbbell-shaped polished rod;
step five: pier head preforming
Adopting linear cutting equipment to process and preform the two end heads of the dumbbell-shaped polished rod;
step six: one-time heating pretwisting
The torsion angle of the dumbbell-shaped polished rod is adjusted to 80 degrees+/-1 degrees, a torsion tool is adopted for heating pre-torsion, torsion force is applied to preformed ends at two ends of a torsion bar spring through flat holes at two ends of the tool, the torsion angle is judged through a flower disc on the tool, locking and fixing are carried out through a positioning screw, the temperature is slowly increased to 110 ℃, the temperature is kept for 2 hours, the furnace is cooled, and the residual deformation angle is recorded after unloading;
step seven: secondary heating pretwisting
Twisting the steel plate again to 90+/-1 DEG, slowly heating the steel plate to 110 ℃ until the steel plate does not contain the residual deformation angle, keeping the steel plate for 2 hours, cooling along with a furnace, and unloading and recording the residual deformation angle; judging that the residual deformation angle difference after the continuous twice treatment is not larger than the design requirement value, and normally reaching the requirement after three cycles; the dumbbell-shaped polished rod is molded into a torsion bar spring, the torsion bar pretwisting reinforcement manufacturability is improved through twice heating gradient pretwisting treatment, the breaking probability of the torsion bar in the pretwisting process is greatly reduced, the pretwisting reinforcement speed is accelerated, the manufacturing efficiency is improved, and the torsion value is also improved through twice heating gradient pretwisting reinforcement;
step eight: thermal ageing
The torsion bar spring is placed into a thermal aging furnace in an idle load way, the temperature is slowly raised to 180 ℃ to 200 ℃, the temperature is kept for 2 hours, and the torsion bar spring is cooled along with the furnace; after forming, heating aging treatment is carried out according to the use temperature, and unstable residual internal stress is released, so that the use stability is greatly improved;
step nine: pier head forming
Adopting linear cutting equipment and a special tool, enabling an inner sleeve to be wrapped with a torsion bar spring and then penetrate into an outer tool together, adopting a set screw to press the inner sleeve tool and the torsion bar spring, utilizing a hexagonal overturning tool to conduct angle positioning, and processing the outer end of a pier head by the linear cutting equipment, wherein the outer end of the pier head is formed in a positive hexagonal manner;
step ten: finished product detection
Finishing the diameter of the torsion bar spring and the hexagonal position tolerance of the two ends, finishing the manual diameter detection by adopting an outside micrometer and performing the form and position tolerance measurement by adopting a three-coordinate measuring machine, wherein the two ends of the formed torsion bar spring are pier heads with a regular hexagonal structure, and the diameter of a middle polished rod is thatThe length of the polish rod is 324mm, the two ends and the middle are transited by large circular arcs, the torque value is 80+/-10 N.m5 when the two ends are twisted by 78 degrees in a hexagonal manner, the residual deformation angle is not more than 1 degree after the working angle is twisted by 78 degrees and is kept for 72 hours, and the residual deformation angle in an idle state is not more than 0.5 degree after long-term torsion storage;
step eleven: the method is suitable for manufacturing torsion bar springs with large working angle, large torque value, high stability and high reliability.
The second embodiment is as follows: referring to fig. 2 and 4, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment will be described, wherein in the first step, a bar having a diameter of 12mm and a length of 350mm and a material composition of 60Si2CrVA is selected.
And a third specific embodiment: referring to fig. 2, the method for manufacturing the high-stability strong torsion bar spring according to the present embodiment is described, wherein in the second step, the turning rotational speed is 300 rpm, the cutting depth of each cutter is 0.6mm, the diameter phi of the dumbbell-shaped polished rod is 8.5mm, the length is 304mm, the total length is 344mm, the straightness is less than 0.5mm, and the grinding allowance of the diameter of the dumbbell-shaped polished rod is 1.5mm.
The specific embodiment IV is as follows: referring to fig. 2 and 3, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment will be described, in which the heat treatment temperature is 850 ℃, the oil quenching is 410 ℃, and the hardness is 47 to 51HRC after the heat treatment.
Fifth embodiment: referring to fig. 2 and 3, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment is described, wherein in the fourth step, 80 mesh grinding wheels are selected, and the diameter of the polished rod portion of the dumbbell-shaped polished rod after fine grinding is phi 7mm, and the length is 302mm.
Specific embodiment six: referring to fig. 3, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment is described, wherein in the fifth step, the feeding depth of the outer end of the pier head is 8mm, the outer end of the pier head is square, the connection portion between the pier head and the polish rod is processed with a chamfer of R10.5, the inner side of the pier head is in a circular truncated cone shape, and the included angle between the side wall of the circular truncated cone and the axis is 15 °.
Seventh embodiment: referring to fig. 1, 3 and 4, a method for manufacturing a high-stability strong torsion bar spring according to this embodiment is described, the tool for torsion bar spring torsion includes a flat hole stopper 1, a faceplate 2, a set screw 3, a main body 4 and a base 5, the upper end of the base 5 is connected with the main body 4, the torsion bar spring is installed in the main body 4, the base 5 and the faceplate 2 are fixedly installed with the flat hole stopper 1, the upper and lower ends of the torsion bar spring are connected with the base 5 and the faceplate 2 through the flat hole stopper 1, the upper end of the main body 4 is provided with a set plate fixedly connected with the main body 4, the set plate is connected with the faceplate 2 through the set screw 3, the base 5 is fixed, torsion force is applied to the preformed end of the upper end of the torsion bar spring through the tool flat hole stopper 1, the torsion angle is determined through the faceplate 2, and the set screw 3 is used for locking fixation, thereby the effect of external force applied in the pretwisting process is reached.
Eighth embodiment: referring to fig. 1, 3 and 4, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment is described, in which the flat hole stopper 1 is square, and the flat hole stopper 1 is connected to the outer end of the pier head of the torsion bar spring.
Detailed description nine: referring to fig. 3-5, a method for manufacturing a high-stability strong torsion bar spring according to the present embodiment is described, where a tool for implementing a regular hexagonal pier head includes an inner sleeve 6, an outer square 7, and a set screw 8, the torsion bar spring is placed in the inner sleeve 6, pier heads at two ends of the torsion bar spring are outside the inner sleeve 6, the inner sleeve 6 is installed in the outer square 7, the set screw 8 is in threaded connection with the outer square 7 and tightly pushes the inner sleeve 6, the outer square 7 is a regular hexagon, a wire cutting device and a special tool are used for final pier head forming, the inner sleeve 6 can be split into two halves, the inner sleeve 6 is used for clamping the torsion bar spring and then penetrating into the outer square 7 together, the inner sleeve 6 and the torsion bar spring are compressed by the set screw 8, and angular positioning is performed by using hexagonal overturning, and the wire cutting device processes six sides at two ends of the torsion bar spring pier head to complete forming.
It should be noted that, in the above embodiments, as long as the technical solutions that are not contradictory can be arranged and combined, those skilled in the art can exhaust all the possibilities according to the mathematical knowledge of the arrangement and combination, so the present invention does not describe the technical solutions after the arrangement and combination one by one, but should be understood that the technical solutions after the arrangement and combination have been disclosed by the present invention.
The present embodiment is only exemplary of the present patent, and does not limit the scope of protection thereof, and those skilled in the art may also change the part thereof, so long as the spirit of the present patent is not exceeded, and the present patent is within the scope of protection thereof.
Claims (5)
1. A manufacturing method of a high-stability strong torsion bar spring is characterized in that: the method comprises the following steps:
step one: selecting a bar;
step two: rough turning forming
Clamping the bar on a lathe, wherein the lathe is used for clamping and turning the bar twice, processing the bar into a dumbbell-shaped polished rod, and grinding center holes at two ends of the dumbbell-shaped polished rod;
step three: heat treatment of
Carrying out heat treatment on the dumbbell-shaped polished rod, wherein the dumbbell-shaped polished rod is placed in a hanging mode in the heat treatment process, and the dumbbell-shaped polished rod reaches specified hardness after the heat treatment;
step four: fine grinding
The dumbbell-shaped polished rod is clamped by double centers, a center frame is arranged in the middle to support the dumbbell-shaped polished rod, and a grinding wheel is used for finely grinding the dumbbell-shaped polished rod;
step five: pier head preforming
Adopting linear cutting equipment to process and preform the two end heads of the dumbbell-shaped polished rod;
step six: one-time heating pretwisting
The torsion angle of the dumbbell-shaped polished rod is adjusted to 80 degrees+/-1 degrees, a torsion tool is adopted for heating pre-torsion, torsion force is applied to preformed ends at two ends of a torsion bar spring through flat holes at two ends of the tool, the torsion angle is judged through a flower disc on the tool, locking and fixing are carried out through a positioning screw, the temperature is slowly increased to 110 ℃, the temperature is kept for 2 hours, the furnace is cooled, and the residual deformation angle is recorded after unloading;
step seven: secondary heating pretwisting
Twisting the steel plate again to 90 degrees+/-1 degrees, slowly heating to 110 ℃, keeping the steel plate for 2 hours, cooling along with a furnace, unloading and recording the residual deformation angle; judging that the residual deformation angle difference is not larger than the design requirement value after two continuous treatments, and forming the dumbbell-shaped polished rod into a torsion bar spring;
step eight: thermal ageing
The torsion bar spring is placed into a thermal aging furnace in an idle load way, the temperature is slowly raised to 180 ℃ to 200 ℃, the temperature is kept for 2 hours, and the torsion bar spring is cooled along with the furnace;
step nine: pier head forming
Adopting linear cutting equipment and a special tool, enabling an inner sleeve to be wrapped with a torsion bar spring and then penetrate into an outer tool together, adopting a set screw to press the inner sleeve tool and the torsion bar spring, utilizing a hexagonal overturning tool to conduct angle positioning, and processing the outer end of a pier head by the linear cutting equipment, wherein the outer end of the pier head is formed in a positive hexagonal manner;
step ten: finished product detection
Completing the diameter of the torsion bar spring and the hexagonal position tolerance of the two ends, and adopting an outside micrometer to complete manual diameter detection and form and position tolerance measurement by a three-coordinate measuring machine;
step eleven: warehousing; in the fifth step, the feeding depth of the outer end of the pier head is 8mm, the outer end of the pier head is square, a chamfer with R10.5 is machined at the connecting part of the pier head and the polished rod, the inner side of the pier head is in a circular truncated cone shape, and the included angle between the side wall of the circular truncated cone and the axis is 15 degrees; the torsion tool for realizing the torsion bar spring in the step six comprises a flat hole limiting block (1), a flower disc (2), a positioning screw (3), a main body (4) and a base (5), wherein the upper end of the base (5) is connected with the main body (4), the torsion bar spring is installed in the main body (4), the flat hole limiting block (1) is fixedly installed in the base (5) and the flower disc (2), the upper end and the lower end of the torsion bar spring are connected with the base (5) and the flower disc (2) through the flat hole limiting block (1), the upper end of the main body (4) is provided with a positioning disc, the positioning disc is fixedly connected with the main body (4), and the positioning disc is connected with the flower disc (2) through the positioning screw (3); the flat hole limiting block (1) is square, and the flat hole limiting block (1) is connected with the outer end of the pier head of the torsion bar spring; the tool for realizing the hexagonal pier head in the step nine comprises an inner sleeve (6), an outer part (7) and a set screw (8), wherein the torsion bar spring is placed in the inner sleeve (6), the pier heads at two ends of the torsion bar spring are arranged outside the inner sleeve (6), the inner sleeve (6) is arranged in the outer part (7), the set screw (8) is in threaded connection with the outer part (7) and tightly pushes the inner sleeve (6), and the outer part (7) is in a regular hexagon shape.
2. The method for manufacturing the high-stability strong torsion bar spring according to claim 1, wherein: in the first step, the bar material with the diameter phi of 12mm and the length of 350mm is selected, and the material composition is 60Si2 CrVA.
3. The method for manufacturing the high-stability strong torsion bar spring according to claim 2, wherein: and in the second step, the turning rotating speed is 300 revolutions per minute, the cutting depth of each cutter is 0.6mm, the diameter phi of the dumbbell-shaped polished rod is 8.5mm, the length is 304mm, the total length is 344mm, the straightness is less than 0.5mm, and the diameter grinding allowance of the dumbbell-shaped polished rod is 1.5mm.
4. A method of manufacturing a high stability strong torsion bar spring according to claim 3, wherein: and thirdly, the heat treatment temperature is 850 ℃, the oil quenching is 410 ℃, the tempering is carried out, and the hardness after the heat treatment is 47-51 HRC.
5. The method for manufacturing the high-stability strong torsion bar spring according to claim 4, wherein: and in the fourth step, the grinding wheel is 80 meshes, and the diameter of the polished rod part of the dumbbell-shaped polished rod after fine grinding is phi 7mm and the length is 302mm.
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