CN111577834B - Link plate pin shaft and processing technology thereof - Google Patents

Link plate pin shaft and processing technology thereof Download PDF

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Publication number
CN111577834B
CN111577834B CN202010271207.8A CN202010271207A CN111577834B CN 111577834 B CN111577834 B CN 111577834B CN 202010271207 A CN202010271207 A CN 202010271207A CN 111577834 B CN111577834 B CN 111577834B
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shaft body
pin shaft
plate pin
peripheral surface
chain plate
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CN111577834A (en
Inventor
叶利剑
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Shanghai Xingdao Forging Co ltd
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Shanghai Xingdao Forging Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/02—Driving-chains
    • F16G13/06—Driving-chains with links connected by parallel driving-pins with or without rollers so called open links
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21G—MAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G3/00—Making pins, nails, or the like
    • B21G3/18—Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16
    • B21G3/28—Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16 by forging or pressing
    • 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
    • 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
    • B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/12—Chain links

Abstract

The invention relates to a chain plate pin shaft and a processing technology thereof, and the chain plate pin shaft comprises a shaft body and two square end heads symmetrically fixed on one side of the shaft body, wherein a transition surface is arranged at the junction between the long side surface of each end head and the inner end surface of each end head; the processing technology of the chain plate pin shaft mainly comprises the following steps: s1, raw material inspection, S2, blanking, S3, intermediate frequency heating, S4, blank making, S5, forging and forming, S6, edge cutting, S7, annealing treatment, S8, link plate pin shaft semi-finished product turning, S9, link plate pin shaft semi-finished product heat treatment and tempering, S10, link plate pin shaft semi-finished product grinding, and S11, finished product warehousing; through setting up the transition face in order to reduce the stress concentration between end and the outer chain plate recess to through the global finish machining of terminal inner end face and axis body, improve surface accuracy and structural strength, optimize end and outer chain plate respectively, the cooperation operating mode of axis body and inner chain plate, and then improve the life and the result of use of chain.

Description

Link plate pin shaft and processing technology thereof
Technical Field
The invention relates to the technical field of chain components, in particular to a chain plate pin shaft.
Background
In recent years, chain drives have been widely used in the field of mechanical transmissions because of their high efficiency in power transmission, their high speed and low maintenance costs.
At present, in heavy load chain structure, round pin axle head portion is circular, and when the installation was used, need insert the round head portion of round pin axle in the circular through-hole of link joint and fixed, because heavy load chain in the course of the work, round pin axle can produce in circular through-hole and rotate, and the round pin axle rotates and to make the link joint produce the shearing to the pin axle and cause the round pin axle damaged, has influenced the life of chain.
Therefore, some chain structures, as shown in fig. 4 and 5, include the pin shaft 10, the outer link plate 20 and the inner link plate 30, wherein both sides of the outer link plate 20 are provided with the grooves 40, and the end 2 of the pin shaft is square, i.e. on the basis of a circle, both sides are cut flat; the pin shaft 10 and the outer chain plate 20 realize the rotation stopping fixation of the pin shaft 10 and the outer chain plate 20 through the matching of the end head 2 and the groove 40, thereby preventing the rotation of the pin shaft 10.
And in order to avoid the cooperation position of end 2 and recess 40 to produce stress concentration, generally establish the right angle department of end 2 into fillet 32, thereby avoid the direct contact between the right angle department of end 2 and the interior right angle department of recess 40, thereby reduce stress concentration, but the juncture between fillet 32 of end 2 and the plane of end 2 is difficult to accomplish smooth transition in actual processing, the juncture is comparatively sharp promptly, consequently when the chain vibration and lead to taking place relative small amplitude displacement between end 2 and the recess 40, the fitting surface of recess 40 is easily scratched to this sharp-pointed department, thereby lead to the cooperation operating mode between end 2 and the recess 40 bad, and the atress area of fitting surface reduces, lead to stress concentration, and then reduce the life of chain.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a chain plate pin shaft and a processing technology thereof.
The above object of the present invention is achieved by the following technical solutions:
the chain plate pin shaft comprises a shaft body and two square end heads symmetrically fixed on one side of the shaft body, wherein a transition surface is arranged at a junction between a long side surface of each end head and an inner end surface of each end head, and each transition surface sequentially comprises a first chamfer, a fillet and a second chamfer along the direction from the inner end surface of each end head to the long side surface of each end head.
By adopting the technical scheme, the first chamfer is positioned at the junction between the inner end surface of the end head and the fillet, and the included angle between the angle of the first chamfer and the tangent line of the fillet is smaller, so that the sharp degree of the junction is reduced, the scratch on the matching surface of the groove is avoided when the end head slides relative to the groove along the radial direction of the shaft body, and the stress concentration at the position is reduced; the second chamfer is positioned at the junction between the long side surface of the end head and the fillet, and the included angle between the angle of the second chamfer and the tangent line of the fillet is smaller, so that the sharp degree of the junction is reduced, the scratch on the matching surface of the groove is avoided when the end head slides relative to the groove along the axis of the shaft body, and the stress concentration at the position is reduced; through setting up the transition face, can effectively reduce the fish tail of the fitting surface to the outer link joint recess, effectively reduce stress concentration, and then improve the life of chain.
The present invention in a preferred example may be further configured to: the surface roughness of the inner end surface of the end head is less than 1.25 mu m.
By adopting the technical scheme, the surface quality of the inner end face of the end head is improved by limiting the surface roughness of the inner end face of the end head, so that the matching working condition of the inner end face of the end head and the groove of the outer chain plate is improved, and the service life and the using effect of the chain are further improved.
The present invention in a preferred example may be further configured to: an included angle between the first chamfer and the inner end face of the end head is smaller than an included angle between the first chamfer and the fillet tangent line, and the included angle between the first chamfer and the inner end face of the end head is 5-10 degrees.
Adopt above-mentioned technical scheme, the contained angle between chamfer one and the fillet tangent line is big more, the sharp-pointed degree of fillet and the juncture of end inner face is less, but can lead to the area reduction of end inner face like this, thereby lead to axial pressure intensity great, but the atress of the axis direction of link joint round pin axle is less, therefore this axial pressure intensity can not do not consider, thereby can increase the contained angle between chamfer one and the fillet tangent line as far as possible, with the sharp-pointed degree of the juncture that reduces fillet and end inner face, consequently, set up 5-10 contained angle, can compromise the axial pressure intensity of less influence degree, and reduce the sharp-pointed degree of the juncture of fillet and end inner face as far as possible, thereby reduce the fish tail of recess fitting surface, thereby improve the life of chain.
The present invention in a preferred example may be further configured to: the length of the second chamfer angle along the thickness direction of the end head is smaller than that of the first chamfer angle along the length direction of the end head.
By adopting the technical scheme, the chain plate pin shaft is large in pulling force in the transmission direction, namely the radial pulling force of the chain plate pin shaft is large, and through the arrangement, the long side face of the end head can have enough contact area, so that the radial pressure at the position is reduced, and the service life of the chain is prolonged.
The present invention in a preferred example may be further configured to: the surface roughness of the peripheral surface of the shaft body is less than 0.25 mu m, and a tool withdrawal groove is arranged at the junction between the peripheral surface of the shaft body and the inner end surface of the end head.
By adopting the technical scheme, the surface quality of the peripheral surface of the shaft body is improved by limiting the surface roughness of the peripheral surface of the shaft body, so that the matching working condition of the peripheral surface of the end and the inner chain plate is improved, and the service life and the use effect of the chain are further improved; and the tool withdrawal groove is arranged, so that the grinding processing of the peripheral surface of the shaft body is facilitated, and the inner end surface of the end head is prevented from being damaged when the grinding wheel grinds.
The present invention in a preferred example may be further configured to: the diameter of the shaft body is D, and when D is more than 10mm and less than or equal to 18mm, the tolerance range of D is-2.5 mu m to +2.5 mu m; when D is more than 18mm and less than or equal to 30mm, the tolerance range of D is from-3 mu m to +3 mu m; when D is more than 30mm and less than or equal to 50mm, the tolerance range of D is between-4 mu m and +4 mu m.
By adopting the technical scheme, as is well known, the smaller the tolerance range of the diameter is, the better the roundness and the surface quality are, but in the same tolerance range, the larger the diameter of the shaft body is, the larger the deformation amount of the shaft body after heat treatment is, and the larger the tolerance error is, namely, the larger the diameter is, the larger the processing difficulty for obtaining good roundness is, so how to limit the tolerance range can meet the higher surface quality and roundness of the peripheral surface of the shaft body, ensure the rapid processing, reduce the unnecessary rejection rate, and be a problem of thinking of value; according to the scheme, the reasonable tolerance range of the D is limited according to the D within the range of different diameters, quantitative reference is given, unnecessary processing difficulty and rejection rate are reduced, the production benefit of an enterprise is met, the use requirement of the shaft body is met, and good surface quality and roundness of the shaft body are ensured, so that the requirements of rapid production and high-quality product control of large-batch operation in a workshop are met.
A processing technology of a chain plate pin shaft comprises the following steps:
s1, inspecting the raw materials, detecting the sizes of the raw materials, and analyzing the components by using a carbon-sulfur analyzer;
s2, blanking, cutting off and blanking the raw materials by adopting a bar stock, and filling the cut raw materials into a charging basket;
s3, intermediate frequency heating, namely putting the qualified raw materials into an intermediate frequency furnace, and heating to 1050-1200 ℃;
s4, blank making, namely placing the heated raw material on an anvil, stamping the raw material by using a punch press, pressing the raw material into a thin waist shape, and stripping the surface oxide skin;
s5, forging and forming, namely, punching and forming the thin waist-shaped raw material by adopting a press machine to form a dumbbell-shaped forging;
s6, trimming, namely cutting off flash by using a trimming die by using a punch press to obtain a semi-finished product of the link plate pin shaft;
and S7, annealing.
S8, turning the semi-finished product of the chain plate pin shaft:
s8.1, turning the outer end surfaces of the two ends in sequence by using a lathe;
s8.2, turning the inner end surfaces of the end heads, using the outer end surfaces of the two end heads as reference surfaces by using a lathe, enabling the semi-finished product of the chain plate pin shaft to rotate around the axis of the shaft body, feeding a cutter of the lathe along the radial direction of the shaft body, turning the inner end surface of the end head, and turning a tool withdrawal groove, wherein the surface roughness of the inner end surface of the end head is required to be less than 1.25 mu m, and 1 tool withdrawal groove is required to be selected every 15 minutes;
s8.3, roughly turning the peripheral surface of the shaft body, rotating the semi-finished product of the chain plate pin shaft around the axis of the shaft body by using a lathe and taking the outer end surfaces of the two end heads as reference surfaces, feeding a cutter of the lathe along the axial direction of the shaft body, and roughly turning the peripheral surface of the shaft body;
s8.4, finely turning the peripheral surface of the shaft body, using a lathe and taking the outer end surfaces of the two ends as reference surfaces to enable the semi-finished product of the chain plate pin shaft to rotate around the axis of the shaft body, feeding a cutter of the lathe along the axial direction of the shaft body, finely turning the peripheral surface of the shaft body, and requiring that the surface roughness of the peripheral surface of the shaft body is less than 1.25 mu m, reserving grinding amount of 0.12mm-0.15mm, and performing spot inspection for 1 product every 15 minutes;
s8.5, milling the end head of the semi-finished product of the chain plate pin shaft, and milling two sides of the round end head to be flat by using a milling machine to manufacture a square-like end head;
s8.6, milling a transition surface, and milling the transition surface on the basis of the plane processed by the previous milling machine by using a milling machine;
s9, carrying out heat treatment tempering on the semi-finished product of the chain plate pin shaft, wherein the hardness is required to reach 40-44HRC, and carrying out first inspection on 3 pieces;
s10, grinding the semi-finished product of the chain plate pin shaft;
s10.1, roughly grinding the peripheral surface of the shaft body, adsorbing the peripheral surface of an end by using an electromagnetic chuck by using a grinding machine, roughly grinding the peripheral surface of the shaft body by using the peripheral surface of the shaft body as a grinding reference surface, and performing spot inspection on 1 part of the peripheral surface of the shaft body every 15 minutes;
s10.2, accurately grinding the peripheral surface of the shaft body by using a grinding machine, adopting an electromagnetic chuck to adsorb the peripheral surface of the end, and taking the peripheral surface of the shaft body as a grinding reference surface to accurately grind the peripheral surface of the shaft body, wherein the surface roughness of the peripheral surface of the shaft body is required to be less than 0.25 mu m, so as to prepare a finished product of the chain plate pin shaft;
and S11, warehousing finished products, visually observing and reducing the damage of each chain plate pin shaft, performing rust prevention treatment on each chain plate pin shaft, and then loading into a basket for warehousing.
According to the technical scheme, firstly, a dumbbell-shaped forge piece is manufactured by forging, then the outer end face of the end is turned to form a reference surface required by subsequent processing, and then the outer end face of the end is taken as the reference surface, the inner end face of the end is turned by rotating a workpiece, so that the surface quality of the inner end face of the end is ensured, the matching stability of the inner end face of the end and the groove of the outer chain plate is ensured, and stress concentration is reduced; then, the outer end face of the end is used as a reference face, the circumferential face of the shaft body is turned in a rotating mode and is divided into rough turning and finish turning, so that the matching working condition of the circumferential face of the end and the inner chain plate is improved, the service life and the using effect of the chain are further improved, the circumferential face of the shaft body and the reference face of the inner end face of the end are both the outer end face of the end, namely the perpendicularity between the circumferential face of the shaft body and the inner end face of the end is good, and the matching stability of a chain plate pin shaft and an outer chain plate is improved; tempering treatment is carried out to meet the following grinding conditions, then rough fine grinding is carried out on the peripheral surface of the shaft body of the chain plate pin shaft after tempering, the surface quality, the roundness and the surface hardness of the peripheral surface of the shaft body are further improved, the matching working condition of the peripheral surface of the end and the inner chain plate is further improved, and the service life and the using effect of the chain are further improved.
The present invention in a preferred example may be further configured to: in S4, S5 and S6, the anvil, forming and trimming dies are preheated to 250-300 ℃.
By adopting the technical scheme, the temperature difference of the temperature of the contact part of the equipment and the raw material relative to the temperature of the raw material is reduced, the condition that the temperature of the raw material is lost too fast in the forging process is reduced, and the normal forging operation of the raw material is facilitated to be ensured.
The present invention in a preferred example may be further configured to: in S8.2, a forming cutter is adopted, and the inner end surfaces of the two end heads are turned at the same time.
By adopting the technical scheme, the processing efficiency can be greatly improved, and the parallelism and the position degree between the inner end faces of the two end heads can be effectively improved.
The present invention in a preferred example may be further configured to: and (3) adding aging treatment on the semi-finished product of the chain plate pin shaft between S10.1 and S10.2, and standing for 24 hours in a room temperature environment.
Adopt above-mentioned technical scheme, after the kibbling of axis body global, carry out aging treatment to eliminate the stress that the kibbling and produce, thereby improve the machining precision of follow-up accurate grinding, thereby improve the processingquality that the axis body is global.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the transition surface is arranged to reduce stress concentration between the end head and the groove of the outer chain plate, the surface precision and the structural strength are improved by finish machining of the inner end surface of the end head and the peripheral surface of the shaft body, the matching working conditions of the end head and the outer chain plate, and the shaft body and the inner chain plate are optimized respectively, and therefore the service life and the using effect of the chain are improved;
2. through carrying out the turning to terminal surface in the end to and turning and the grinding global of axis body, can effectively improve terminal surface in the end and the global surface quality and the hardness of axis body to further improve the life and the result of use of chain, and set up reasonable reference surface and processing order, under the prerequisite of ensureing processingquality, can reduce cutter wearing and tearing and improve machining efficiency.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1;
FIG. 2 is a schematic view showing the whole structure of embodiment 1 in cooperation with an outer link plate;
FIG. 3 is a schematic illustration of the forging in S5 of embodiment 2;
FIG. 4 is a schematic diagram of a prior art structure;
fig. 5 is an exploded view of a prior art structure.
In the figure, 1, a shaft body; 2. a tip; 3. a transition surface; 10. a pin shaft; 11. a tool withdrawal groove; 20. an outer link plate; 30. an inner link plate; 31. chamfering I; 32. round corners; 33. chamfering II; 40. and (4) a groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: as shown in fig. 1, the link joint pin shaft disclosed by the present invention comprises a shaft body 1 and two square ends 2 symmetrically fixed on one side of the shaft body 1.
The surface roughness of the peripheral surface of the shaft body 1 is less than 0.25 mu m, and a tool withdrawal groove 11 is arranged at the junction between the peripheral surface of the shaft body 1 and the inner end surface of the end head 2; through the surface roughness who restricts the global of axis body 1, improve the surface quality of the global of axis body 1 to improve the global cooperation condition with the inner chain board 30 of end 2, further improved the life and the result of use of chain.
The diameter of the shaft body 1 is D, and when D is more than 10mm and less than or equal to 18mm, the tolerance range of D is-2.5 mu m to +2.5 mu m; when D is more than 18mm and less than or equal to 30mm, the tolerance range of D is from-3 mu m to +3 mu m; when D is more than 30mm and less than or equal to 50mm, the tolerance range of D is between-4 mu m and +4 mu m; according to the D within the range of different diameters, the reasonable tolerance range of the D is limited, quantitative reference is given, unnecessary processing difficulty and rejection rate are reduced, the production benefit of enterprises is met, the use requirement of the shaft body 1 is met, and good surface quality and roundness of the shaft body are ensured, so that the requirements of rapid production and high-quality product control of large-batch operation in workshops are met.
As shown in fig. 1 and 2, the surface roughness of the inner end surface of the tip 2 is less than 1.25 μm, a transition surface 3 is arranged at the boundary between the long side surface of the tip 2 and the inner end surface of the tip 2, and the transition surface 3 sequentially comprises a first chamfer 31, a second chamfer 32 and a third chamfer 33 along the direction from the inner end surface of the tip 2 to the long side surface of the tip 2.
The first chamfer 31 is positioned at the junction between the inner end face of the end head 2 and the fillet 32, and the included angle between the angle of the first chamfer 31 and the tangent of the fillet 32 is smaller, so that the sharpness of the junction is reduced, the matching surface of the groove 40 is prevented from being scratched when the end head 2 slides relative to the groove 40 along the radial direction of the shaft body 1, and the stress concentration at the position is reduced; the second chamfer 33 is positioned at the junction between the long side surface of the end 2 and the fillet 32, and the included angle between the angle of the second chamfer 33 and the tangent of the fillet 32 is smaller, so that the sharp degree of the junction is reduced, the scratch on the matching surface of the groove 40 is avoided when the end 2 slides relative to the groove 40 along the axis of the shaft body 1, and the stress concentration at the position is reduced; through setting up transition face 3, can effectively reduce the fish tail of the fitting surface to outer link joint 20 recess 40, effectively reduce stress concentration, and then improve the life of chain.
An included angle between the first chamfer 31 and the inner end face of the end head 2 is smaller than an included angle between the first chamfer 31 and a tangent line of the fillet 32, and the included angle between the first chamfer 31 and the inner end face of the end head 2 is 5-10 degrees; by setting the included angle of 5-10 degrees, the influence of the contact pressure of the inner end face of the end head 2 can be reduced, and the sharp degree of the junction of the fillet 32 and the inner end face of the end head 2 is reduced as much as possible, so that the scratch of the matching surface of the groove 40 is reduced, and the service life of the chain is prolonged.
And the length of the second chamfer 33 along the thickness direction of the end head 2 is smaller than that of the first chamfer 31 along the length direction of the end head 2, so that the long side surface of the end head 2 has enough contact area, the radial pressure at the position is reduced, and the service life of the chain is prolonged.
Example 2: a processing technology of a chain plate pin shaft comprises the following steps:
s1, inspecting the raw materials, detecting the sizes of the raw materials, and analyzing the components by using a carbon-sulfur analyzer;
s2, blanking, cutting off and blanking the raw materials by adopting a bar stock, and filling the cut raw materials into a charging basket;
s3, intermediate frequency heating, namely putting the qualified raw materials into an intermediate frequency furnace, and heating to 1050-1200 ℃;
s4, blank making, namely preheating an anvil upset in advance to 250-300 ℃, then placing the heated raw material on the anvil upset, stamping the raw material by using a punch, pressing the raw material into a thin waist shape, and stripping surface oxide skin;
s5, forging and forming, namely preheating a forming die to 250 ℃ and 300 ℃, and then stamping and forming the thin waist-shaped raw material by adopting a press machine to form the dumbbell-shaped forging piece (see figure 3);
s6, trimming, namely, preheating a trimming die in advance by using a punch to 250 ℃ and 300 ℃, and cutting off flash by using the trimming die to obtain a semi-finished product of the link plate pin shaft;
and S7, annealing.
S8, turning the semi-finished product of the chain plate pin shaft:
s8.1, turning the outer end surfaces of the two ends 2 in sequence by using a lathe;
s8.2, turning the inner end surfaces of the end heads 2, using the outer end surfaces of the two end heads 2 as reference surfaces by using a lathe, enabling the semi-finished product of the chain plate pin shaft to rotate around the axis of the shaft body 1, adopting a forming cutter, feeding the cutter of the lathe along the radial direction of the shaft body 1, simultaneously turning the inner end surfaces of the two end heads 2, and turning tool withdrawal grooves 11, wherein the surface roughness of the inner end surfaces of the end heads 2 is required to be less than 1.25 mu m, and 1 tool withdrawal inspection is carried out every 15 minutes;
s8.3, roughly turning the peripheral surface of the shaft body 1, rotating the semi-finished product of the chain plate pin shaft around the axis of the shaft body 1 by using a lathe and taking the outer end surfaces of the two end heads 2 as reference surfaces, feeding a cutter of the lathe along the axial direction of the shaft body 1, and roughly turning the peripheral surface of the shaft body 1;
s8.4, finely turning the peripheral surface of the shaft body 1, using a lathe, taking the outer end surfaces of the two end heads 2 as reference surfaces, enabling the semi-finished product of the chain plate pin shaft to rotate around the axis of the shaft body 1, feeding a cutter of the lathe along the axial direction of the shaft body 1, finely turning the peripheral surface of the shaft body 1, requiring that the surface roughness of the peripheral surface of the shaft body 1 is less than 1.25 mu m, reserving 0.12mm-0.15mm grinding amount, and performing spot inspection on 1 product every 15 minutes;
s8.5, milling the end head 2 of the semi-finished product of the chain plate pin shaft, and milling two sides of the round end head 2 to be flat by using a milling machine to manufacture a square-like end head 2;
s8.6, milling the transition surface 3, and milling the transition surface 3 by using a milling machine on the basis of the plane processed by the previous milling machine;
s9, carrying out heat treatment tempering on the semi-finished product of the chain plate pin shaft, wherein the hardness is required to reach 40-44HRC, and carrying out first inspection on 3 pieces;
s10, grinding the semi-finished product of the chain plate pin shaft;
s10.1, roughly grinding the peripheral surface of the shaft body 1, using a grinding machine, adopting an electromagnetic chuck to adsorb the peripheral surface of the end 2, taking the peripheral surface of the shaft body 1 as a grinding reference surface, roughly grinding the peripheral surface of the shaft body 1, and performing sampling inspection on 1 part of the peripheral surface every 15 minutes;
performing aging treatment, namely standing the semi-finished product of the chain plate pin shaft for 24 hours in a room temperature environment to eliminate stress generated by coarse grinding so as to improve the processing precision of subsequent fine grinding;
s10.2, accurately grinding the peripheral surface of the shaft body 1 by using a grinding machine, adopting an electromagnetic chuck to adsorb the peripheral surface of the end 2, and taking the peripheral surface of the shaft body 1 as a grinding reference surface to accurately grind the peripheral surface of the shaft body 1, wherein the surface roughness of the peripheral surface of the shaft body 1 is required to be less than 0.25 mu m, so as to prepare a finished product of the chain plate pin shaft;
and S11, warehousing finished products, visually observing and reducing the damage of each chain plate pin shaft, performing rust prevention treatment on each chain plate pin shaft, and then loading into a basket for warehousing.
Firstly, forging to manufacture a dumbbell-shaped forging, then turning the outer end face of the end head 2 to form a reference surface required by subsequent processing, and then turning the inner end face of the end head 2 by using the outer end face of the end head 2 as the reference surface, so that the surface quality of the inner end face of the end head 2 is ensured, the matching stability of the inner end face of the end head 2 and the groove 40 of the outer chain plate 20 is ensured, and stress concentration is reduced;
then, the outer end face of the end 2 is taken as a reference face, the circumferential face of the shaft body 1 is turned in a rotating mode and is divided into rough turning and finish turning, so that the matching working condition of the circumferential face of the end 2 and the inner chain plate 30 is improved, the service life and the using effect of the chain are further improved, the circumferential face of the shaft body 1 and the reference face of the inner end face of the end 2 are both the outer end face of the end 2, namely the perpendicularity between the circumferential face of the shaft body 1 and the inner end face of the end 2 is good, and the matching stability of a chain plate pin shaft and the outer chain plate 20 is improved;
and then the peripheral surface of the shaft body 1 of the chain plate pin shaft after tempering is subjected to rough fine grinding, so that the surface quality, the roundness and the surface hardness of the peripheral surface of the shaft body 1 are further improved, the matching working condition of the peripheral surface of the end head 2 and the inner chain plate 30 is improved, and the service life and the using effect of the chain are further improved.
In the embodiment, the inner end surface of the end 2 is turned, and the peripheral surface of the shaft body 1 is turned and ground, so that the surface quality and hardness of the inner end surface of the end 2 and the peripheral surface of the shaft body 1 can be effectively improved, the requirements of the surface quality of the inner end surface of the end 2 and the peripheral surface of the shaft body 1 in the embodiment 1 are met, and the service life and the use effect of the chain are further improved; and set up reasonable reference surface and processing order, under the prerequisite of guaranteeing processingquality, can reduce cutter wearing and tearing and improve machining efficiency.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (7)

1. The utility model provides a link joint round pin axle, includes that axis body (1) and two symmetries are fixed in square end (2) of one side of axis body (1), its characterized in that: a transition surface (3) is arranged at the junction between the long side surface of the end head (2) and the inner end surface of the end head (2), and the transition surface (3) sequentially comprises a first chamfer (31), a second chamfer (32) and a second chamfer (33) along the direction from the inner end surface of the end head (2) to the long side surface of the end head (2); the surface roughness of the inner end surface of the end head (2) is less than 1.25 mu m; an included angle between the first chamfer (31) and the inner end face of the end head (2) is smaller than an included angle between the first chamfer (31) and a tangent of the fillet (32), and the included angle between the first chamfer (31) and the inner end face of the end head (2) is 5-10 degrees; the length of the second chamfer (33) along the thickness direction of the end head (2) is smaller than the length of the first chamfer (31) along the length direction of the end head (2).
2. A link plate pin shaft according to claim 1, wherein: the surface roughness of the peripheral surface of the shaft body (1) is less than 0.25 mu m, and a tool withdrawal groove (11) is arranged at the junction between the peripheral surface of the shaft body (1) and the inner end surface of the end head (2).
3. A link plate pin shaft according to claim 2, wherein: the diameter of the shaft body (1) is D, and when D is more than 10mm and less than or equal to 18mm, the tolerance range of D is-2.5 mu m to +2.5 mu m; when D is more than 18mm and less than or equal to 30mm, the tolerance range of D is from-3 mu m to +3 mu m; when D is more than 30mm and less than or equal to 50mm, the tolerance range of D is between-4 mu m and +4 mu m.
4. A process for machining a link plate pin shaft according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1, inspecting the raw materials, detecting the sizes of the raw materials, and analyzing the components by using a carbon-sulfur analyzer;
s2, blanking, cutting off and blanking the raw materials by adopting a bar stock, and filling the cut raw materials into a charging basket;
s3, intermediate frequency heating, namely putting the qualified raw materials into an intermediate frequency furnace, and heating to 1050-1200 ℃;
s4, blank making, namely placing the heated raw material on an anvil, stamping the raw material by using a punch press, pressing the raw material into a thin waist shape, and stripping the surface oxide skin;
s5, forging and forming, namely, punching and forming the thin waist-shaped raw material by adopting a press machine to form a dumbbell-shaped forging;
s6, trimming, namely cutting off flash by using a trimming die by using a punch press to obtain a semi-finished product of the link plate pin shaft;
s7, annealing;
s8, turning the semi-finished product of the chain plate pin shaft:
s8.1, turning the outer end surfaces of the two ends (2) in sequence by using a lathe;
s8.2, turning the inner end surfaces of the end heads (2), using the outer end surfaces of the two end heads (2) as reference surfaces by using a lathe, enabling the semi-finished product of the chain plate pin shaft to rotate around the axis of the shaft body (1), feeding a cutter of the lathe along the radial direction of the shaft body (1), turning the inner end surfaces of the end heads (2), and turning tool withdrawal grooves (11), wherein the surface roughness of the inner end surfaces of the end heads (2) is required to be less than 1.25 mu m, and 1 tool withdrawal inspection is carried out every 15 minutes;
s8.3, roughly turning the peripheral surface of the shaft body (1), wherein the semi-finished product of the chain plate pin shaft rotates around the axis of the shaft body (1) by using a lathe and taking the outer end surfaces of the two end heads (2) as reference surfaces, and a cutter of the lathe feeds along the axial direction of the shaft body (1) to roughly turn the peripheral surface of the shaft body (1);
s8.4, finely turning the peripheral surface of the shaft body (1), rotating the semi-finished product of the chain plate pin shaft around the axis of the shaft body (1) by using a lathe and taking the outer end surfaces of the two end heads (2) as reference surfaces, feeding a cutter of the lathe along the axial direction of the shaft body (1), finely turning the peripheral surface of the shaft body (1), and requiring that the surface roughness of the peripheral surface of the shaft body (1) is less than 1.25 mu m, reserving a grinding amount of 0.12mm-0.15mm, and performing spot inspection on 1 product every 15 minutes;
s8.5, milling the end head (2) of the link plate pin shaft semi-finished product, and milling two sides of the round end head (2) to be flat by using a milling machine to manufacture a quasi-square end head (2);
s8.6, milling a transition surface (3), and milling the transition surface (3) by using a milling machine on the basis of a plane processed by the previous milling machine;
s9, carrying out heat treatment tempering on the semi-finished product of the chain plate pin shaft, wherein the hardness is required to reach 40-44HRC, and carrying out first inspection on 3 pieces;
s10, grinding the semi-finished product of the chain plate pin shaft;
s10.1, roughly grinding the peripheral surface of the shaft body (1), adsorbing the peripheral surface of an end (2) by using an electromagnetic chuck by using a grinding machine, roughly grinding the peripheral surface of the shaft body (1) by using the peripheral surface of the shaft body (1) as a grinding reference surface, and performing sampling inspection on 1 part of the peripheral surface of the shaft body (1) every 15 minutes;
s10.2, finely grinding the peripheral surface of the shaft body (1), namely finely grinding the peripheral surface of the shaft body (1) by using a grinding machine and an electromagnetic chuck to adsorb the peripheral surface of the end (2), and taking the peripheral surface of the shaft body (1) as a grinding reference surface, wherein the surface roughness of the peripheral surface of the shaft body (1) is required to be less than 0.25 mu m, so as to prepare a finished product of the chain plate pin shaft;
and S11, warehousing finished products, visually observing and reducing the damage of each chain plate pin shaft, performing rust prevention treatment on each chain plate pin shaft, and then loading into a basket for warehousing.
5. The processing technology of a link plate pin shaft according to claim 4, characterized in that: in S4, S5 and S6, the anvil, forming and trimming dies are preheated to 250-300 ℃.
6. The processing technology of a link plate pin shaft according to claim 4, characterized in that: in S8.2, a forming cutter is adopted, and the inner end surfaces of the two end heads (2) are turned at the same time.
7. The processing technology of a link plate pin shaft according to claim 4, characterized in that: and (3) adding aging treatment on the semi-finished product of the chain plate pin shaft between S10.1 and S10.2, and standing for 24 hours in a room temperature environment.
CN202010271207.8A 2020-04-08 2020-04-08 Link plate pin shaft and processing technology thereof Active CN111577834B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201155544Y (en) * 2007-09-26 2008-11-26 南京利民机械有限责任公司 Bicycle speed changing chain inner chain mat and corresponding bicycle speed changing chain
DE102008034360A1 (en) * 2008-07-23 2010-02-04 Pewag Austria Gmbh Made of a D-section steel section chain link, in particular for a hoist chain
RU2448889C1 (en) * 2008-07-25 2012-04-27 Буцирус Ойропе Гмбх Link chain for chain conveyors and horizontal chain links
CN203257984U (en) * 2013-05-15 2013-10-30 天津市锴瑞金属制品有限公司 Chain
CN203348434U (en) * 2013-06-21 2013-12-18 南京化工职业技术学院 Sleeve roller chain model convenient to disassemble, assemble and close
CN104439922A (en) * 2014-10-28 2015-03-25 江苏万达特种轴承有限公司 Chamfering technology
CN104439027A (en) * 2014-11-05 2015-03-25 许昌中兴锻造有限公司 New forging process for yoke shaft of transmission shaft
CN104959629A (en) * 2015-06-29 2015-10-07 安庆市吉安汽车零件锻轧有限公司 Improvement method of shaft part machining technology

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201155544Y (en) * 2007-09-26 2008-11-26 南京利民机械有限责任公司 Bicycle speed changing chain inner chain mat and corresponding bicycle speed changing chain
DE102008034360A1 (en) * 2008-07-23 2010-02-04 Pewag Austria Gmbh Made of a D-section steel section chain link, in particular for a hoist chain
RU2448889C1 (en) * 2008-07-25 2012-04-27 Буцирус Ойропе Гмбх Link chain for chain conveyors and horizontal chain links
CN203257984U (en) * 2013-05-15 2013-10-30 天津市锴瑞金属制品有限公司 Chain
CN203348434U (en) * 2013-06-21 2013-12-18 南京化工职业技术学院 Sleeve roller chain model convenient to disassemble, assemble and close
CN104439922A (en) * 2014-10-28 2015-03-25 江苏万达特种轴承有限公司 Chamfering technology
CN104439027A (en) * 2014-11-05 2015-03-25 许昌中兴锻造有限公司 New forging process for yoke shaft of transmission shaft
CN104959629A (en) * 2015-06-29 2015-10-07 安庆市吉安汽车零件锻轧有限公司 Improvement method of shaft part machining technology

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