阅读说明：本技术 一种六角螺丝生产工艺 (Hexagonal screw production process ) 是由 屠乾宏 陈俭 张勇 祝建华 于 2020-07-24 设计创作，主要内容包括：本申请涉及一种六角螺丝生产工艺,涉及螺丝制造技术领域,包括如下步骤：A.拉丝,拉拔钢筋,得到便于加工的线材；B.退火,线材退火处理；C.酸洗,线材酸洗；D.清洗；E.磷化.线材磷化；F.皂化.线材经水冲洗后吊入皂化液中,75-80℃温度下皂化3-7min；G.精拉,线材送入精拉机中进行多级拉丝处理；H.打头；I.夹尾；J.打螺线；K.表面处理；L.电镀。针对现有的六角螺丝加工过程中线材受温度影响较大的问题,本申请具有在拉丝过程中冷却线材、提高拉丝精度的效果。(The application relates to a hexagonal screw production process, relates to the technical field of screw manufacturing, and comprises the following steps: A. drawing wires and drawing steel bars to obtain wires convenient to process; B. annealing, namely annealing the wire; C. acid pickling, namely pickling the wire; D. cleaning; E. phosphating the wire; F. the wire is washed by water and then is hung in the saponification liquid to be saponified for 3-7min at the temperature of 75-80 ℃; G. fine drawing, wherein the wire is sent into a fine drawing machine to be subjected to multistage wire drawing treatment; H. heading; I. clamping a tail; J. screwing; K. surface treatment; and L, electroplating. To the great problem of temperature influence is received to wire rod in the current hexagonal screw course of working, this application has the effect of cooling wire rod, improvement wire drawing precision at the wire drawing in-process.)

1. A production process of a hexagonal screw is characterized by comprising the following steps: the method comprises the following steps:

A. drawing, namely feeding the steel bars into a drawing machine for drawing and coiling the steel bars on a wire frame to obtain a wire rod which is convenient to process;

B. annealing, namely feeding the wire rod obtained in the step A into an annealing furnace for annealing treatment;

C. acid washing, namely putting the wire rod annealed in the step B into a tank filled with acid washing liquid, and heating the acid washing liquid to 50-60 ℃ for acid washing for 5-15 min;

D. c, washing, namely washing the wire rod pickled in the step C, then hanging the wire rod into a tank filled with a neutralizing solution, neutralizing for 1-3min at normal temperature, then hanging the wire rod into a tank filled with a clear water solution, and washing for 1min at normal temperature;

E. d, phosphating, namely hoisting the wire rod cleaned in the step D into a tank filled with phosphating solution, and phosphating for 8-12min at the temperature of 75-85 ℃;

F. e, hanging the wire rod washed by water into a groove filled with saponification liquid, and saponifying at the temperature of 75-80 ℃ for 3-7 min;

G. d, fine drawing, namely feeding the wire rod obtained in the step F into a fine drawing machine for multi-stage wire drawing treatment, so that the section diameter of the steel bar meets the processing standard;

H. g, heading, namely feeding the wire rod obtained in the step G into a heading machine to obtain a screw rough blank I with a hexagonal head;

I. clamping the tail, feeding the screw rough blank obtained in the step H into a tail clamping machine, and manufacturing a drill bit at the tail part of the screw rough blank I;

J. b, screwing, namely feeding the screw rough blank obtained in the step I into a thread rolling machine, and processing threads on the screw rough blank;

K. surface treatment, namely tempering after quenching the screw rough blank obtained in the step J;

and L, electroplating, namely electroplating the hexagonal screw obtained in the step K.

2. The hexagonal screw production process according to claim 1, characterized in that: the finish drawing machine comprises a rack (1) and a plurality of groups of wire drawing mechanisms (3) arranged on a working table top of the rack (1), wherein each wire drawing mechanism (3) comprises a guide die box (5), a cooling die box (6) and an inclined drawing cylinder (4), and the cooling die box (6) is arranged at a discharge port of the guide die box (5);

the cooling die box (6) comprises a cooling die cavity (61) arranged inside the cooling die box (6), a plurality of coaxial wire drawing dies are arranged in the cooling die cavity (61), and the plurality of wire drawing dies are arranged at intervals and are adjacent to each other, and cooling media are filled between the wire drawing dies.

3. The hexagonal screw production process according to claim 2, characterized in that: the wire drawing die comprises a primary wire drawing die (64) and a secondary wire drawing die (65) with a wire drawing diameter smaller than that of the primary wire drawing die (64), the primary wire drawing die (64) is arranged at one end, close to the guide die box (5), of the cooling die cavity (61), the secondary wire drawing die (65) is arranged at one end, far away from the guide die box (5), of the cooling die cavity (61), and a liquid inlet pipe (66) used for introducing cooling lubricating oil into the cooling die cavity (61) and a liquid outlet pipe (67) used for discharging the cooling lubricating oil in the cooling die cavity (61) are arranged between the primary wire drawing die (64) and the secondary wire drawing die (65) in the cooling die cavity (61).

4. The hexagonal screw production process according to claim 3, characterized in that: the outer contours of the first-stage wire-drawing die (64) and the second-stage wire-drawing die (65) are both in a circular truncated cone shape, a first mounting hole (62) matched with the outer contour of the first-stage wire-drawing die (64) and a second mounting hole (63) matched with the outer contour of the second-stage wire-drawing die (65) are respectively formed in two ends of the cooling die cavity (61), and the first mounting hole (62) and the second mounting hole (63) are two coaxial conical holes.

5. The hexagonal screw production process according to claim 4, characterized in that: and a compression spring (68) is inserted into the cooling die cavity (61), and two ends of the compression spring (68) are respectively abutted against the first-stage wire-drawing die (64) and the second-stage wire-drawing die (65).

6. The hexagonal screw production process according to claim 5, characterized in that: the liquid inlet pipe (66) is positioned at the bottom of one end of the cooling die cavity (61) close to the primary wire-drawing die (64), and the liquid outlet pipe (67) is positioned at the top of one end of the cooling die cavity (61) close to the secondary wire-drawing die (65).

7. The hexagonal screw production process according to claim 6, characterized in that: one side of the guide die box (5) far away from the cooling die box (6) is provided with a vertical guide column pair (71) for limiting the horizontal position of the wire rod and a horizontal guide column pair (72) for adjusting the height position of the wire rod axis, and the vertical guide column pair (71) and the horizontal guide column pair (72) respectively comprise two drum-type limiting columns.

8. The hexagonal screw production process according to claim 6, characterized in that: a guide die head (51) coaxial with the primary wire-drawing die (64) and the secondary wire-drawing die (65) is installed in the guide die box (5), and a guide hole coaxial with the cooling die cavity (61) and in clearance fit with the wire rod is formed in the guide die head (51).

Technical Field

The application relates to the technical field of screw manufacturing, in particular to a hexagonal screw production process.

Background

The screw is a tool for fastening the parts of the object step by utilizing the inclined circular rotation and the friction force of the object. The screw is an indispensable industrial necessity in daily life, such as an extremely small screw used for products such as cameras, glasses, clocks, electronics and the like; common screws for televisions, electrical products, musical instruments, furniture and the like, and large screws for engineering, buildings and bridges. The screw has an important task in industry, and as long as there is industry on earth, the function of the screw is always important. The screw is a common invention in production and life of people for thousands of years, and is the first invention of human according to the application field.

The wire drawing device is a straight wire drawing machine, a straight wire drawing stage generally comprises a rack, an inclined drawing cylinder, a driving motor for driving the inclined drawing cylinder to rotate and a wire drawing die for changing the diameter of the wire, the wire is wound on the inclined drawing cylinder, and the driving motor drives the inclined drawing cylinder to rotate so as to drive the wire to pass through the wire drawing die through friction force to change the diameter of the wire. The wire rod generates more heat due to friction and deformation while passing through the wire-drawing die.

In view of the related art in the above, the inventors considered that there was a problem that wire drawing accuracy was affected by excessively high wire temperature.

Disclosure of Invention

In order to improve the wire drawing precision of hexagonal screw production process, the application provides a hexagonal screw production technology, has the effect that has improved the wire drawing precision in the hexagonal screw production process.

The hexagonal screw production process provided by the application adopts the following technical scheme:

a production process of a hexagonal screw comprises the following steps:

a: drawing, namely feeding the steel bars into a drawing machine for drawing and coiling the steel bars on a wire frame to obtain a wire rod which is convenient to process;

b: annealing, namely feeding the wire rod obtained in the step A into an annealing furnace for annealing treatment;

c: acid washing, namely putting the wire rod annealed in the step B into a tank filled with acid washing liquid, and heating the acid washing liquid to 50-60 ℃ for acid washing for 5-15 min;

d: c, washing, namely washing the wire rod and the wire rod which are washed in the step C, hoisting the washed wire rod and the wire rod into a tank filled with a neutralizing solution, and neutralizing for 1-3min at normal temperature; then, the wire rod is firstly hung in a groove filled with clear water liquid and cleaned for 1min at normal temperature;

e: phosphorization: d, hoisting the wire rod cleaned in the step D into a tank filled with a phosphating solution, and phosphating for 8-12min at the temperature of 75-85 ℃;

f: saponification: e, hanging the wire rod washed by water into a groove filled with saponification liquid, and saponifying at the temperature of 75-80 ℃ for 3-7 min;

g: d, fine drawing, namely feeding the wire rod obtained in the step F into a fine drawing machine for multi-stage wire drawing treatment, so that the section diameter of the steel bar meets the processing standard;

h: g, heading, namely feeding the wire rod obtained in the step G into a heading machine to obtain a screw rough blank I with a hexagonal head;

i: clamping the tail, feeding the screw rough blank obtained in the step H into a tail clamping machine, and manufacturing a drill bit at the tail part of the screw rough blank I;

j: b, screwing, namely feeding the screw rough blank obtained in the step I into a thread rolling machine, and processing threads on the screw rough blank;

k: surface treatment, namely tempering after quenching the screw rough blank obtained in the step J;

l: and D, electroplating, namely electroplating the hexagonal screw obtained in the step K.

By adopting the technical scheme, the mode of multistage drawing is adopted, the deformation amount of the wire rod in each stage is reduced, the heat generated during wire rod drawing is reduced, the temperature change of the wire rod drawing process is reduced, the influence of temperature factors on the size precision of the wire drawing die of the fine drawing machine and the characteristics of the wire rod is reduced, and the wire drawing precision of the wire rod is improved.

Preferably, the finish drawing machine comprises a rack and a plurality of groups of wire drawing mechanisms arranged on a working table surface of the rack, each wire drawing mechanism comprises a guide die box, a cooling die box and an inclined drawing cylinder, and the cooling die box is arranged at a discharge port of the guide die box;

the cooling die box comprises a cooling die cavity arranged inside the cooling die box, a plurality of coaxial wire drawing dies are arranged in the cooling die cavity, and a plurality of wire drawing dies are arranged at intervals and are adjacent to each other, and cooling media are filled between the wire drawing dies.

Through adopting above-mentioned technical scheme, set up multistage drawing die in single wire drawing structure, under the unchangeable circumstances of wire drawing mechanism quantity and wire drawing requirement not increasing, the deformation volume of wire rod on single drawing die has relatively been reduced, and then the heat production of single drawing die department in the wire drawing process has been reduced, the wire rod after the wire drawing gets into cooling medium and cools down, reentrant next drawing die carries out the wire drawing, the wire rod temperature has effectively been reduced, the wire rod precision has been improved, the reduction of temperature also reduces the destruction of wire rod to the drawing die, the precision of drawing die has been improved, the precision of wire drawing has further been improved.

Preferably, the wire-drawing die comprises a first-stage wire-drawing die and a second-stage wire-drawing die, the wire-drawing diameter of the second-stage wire-drawing die is smaller than that of the first-stage wire-drawing die, the first-stage wire-drawing die is arranged at one end of the cooling die cavity close to the guide die box, the second-stage wire-drawing die is arranged at one end of the cooling die cavity far away from the guide die box, and a liquid inlet pipe for introducing cooling lubricating oil into the cooling die cavity and a liquid outlet pipe for discharging the cooling lubricating oil in the cooling die cavity are arranged in the cooling die cavity between the first-stage wire-drawing die and the second-stage wire.

By adopting the technical scheme, the wire rod enters the cooling die cavity after passing through the primary wire drawing die for wire drawing, is cooled by the cooling liquid, reduces the temperature of the wire rod, and selects the cooling lubricating oil for cooling, so that the wire rod can be lubricated while being cooled, the wire rod can be conveniently drawn on the secondary wire drawing die, and the heat generated by the wire rod on the secondary wire drawing die is reduced; the liquid inlet pipe is used for feeding oil and discharging oil from the liquid storage tank, so that the cooling medium in the cooling die cavity is continuously replaced, and the better cooling effect of the cooling medium can be guaranteed.

Preferably, the outer contours of the first-stage wire-drawing die and the second-stage wire-drawing die are both in a circular truncated cone shape, the two ends of the cooling die cavity are respectively provided with a first mounting hole matched with the outer contour of the first-stage wire-drawing die and a second mounting hole matched with the outer contour of the second-stage wire-drawing die, and the first mounting hole and the second mounting hole are two coaxial conical holes.

By adopting the technical scheme, the first-stage wire drawing die is matched with the first mounting hole, and the second-stage wire drawing die is matched with the second mounting hole, so that the automatic centering effect is achieved, the first-stage wire drawing die is tightly matched with the first mounting hole and the second-stage wire drawing die is tightly matched with the second mounting hole under the driving of the pulling force of the wire rod, the axes of the first-stage wire drawing die and the second-stage wire drawing die are reliably positioned on the same axis, the coaxiality of the wire drawing dies during continuous wire drawing of the plurality of wire drawing dies is guaranteed, and the quality of the wire rod is guaranteed; the tightness degree of the matching between the cavity walls of the first-stage wire-drawing die, the second-stage wire-drawing die and the cooling die cavity is improved, and the sealing performance is improved.

Preferably, a compression spring is inserted into the cooling die cavity, and two ends of the compression spring are respectively abutted with the first-stage wire-drawing die and the second-stage wire-drawing die.

Through adopting above-mentioned technical scheme, compression spring provides the force of support, conveniently dismantles one-level wire drawing mould.

Preferably, the liquid inlet pipe is positioned at the bottom of the cooling die cavity close to one end of the primary wire-drawing die, and the liquid outlet pipe is positioned at the top of the cooling die cavity close to one end of the secondary wire-drawing die.

By adopting the technical scheme, the oil inlet pipe is used for feeding oil, and when the oil discharge pipe discharges oil, under the guide of the compression spring, spiral liquid flow which is screwed from the first-stage wire drawing die to the second-stage wire drawing die can be generated in the cooling die cavity, so that the cooling effect is optimized.

Preferably, one side of the guide die box, which is far away from the cooling die box, is provided with a vertical guide column pair for limiting the horizontal position of the wire rod and a horizontal guide column pair for adjusting the height position of the axis of the wire rod, and the vertical guide column pair and the horizontal guide column pair both comprise two drum-type limiting columns.

Through adopting above-mentioned technical scheme, through horizontal guide post to restricting the advancing direction of wire rod with vertical guide post, the time wire rod can be more smooth and easy the entering into wire drawing die.

Preferably, a guide die head coaxial with the first-stage wire-drawing die and the second-stage wire-drawing die is installed in the guide die box, and a guide hole coaxial with the cooling die cavity and in clearance fit with the wire rod is formed in the guide die head.

By adopting the technical scheme, the guide die head is arranged in the guide die box, so that the coaxiality of the wire rod and the first-stage wire drawing die when the wire rod enters the first-stage wire drawing die is improved, the damage of the wire rod to the wire drawing die in the advancing process is reduced, and the wire drawing precision is further improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the deformation amount of the wire rod at each stage is reduced by adopting a multi-stage drawing mode, so that the heat generated during wire rod drawing is reduced, the temperature change in the wire rod drawing process is reduced, the influence of temperature factors on the size precision of a wire drawing die of a fine drawing machine and the characteristics of the wire rod is further reduced, and the wire drawing precision of the wire rod is improved;

2. the wire drawing mechanism is characterized in that a plurality of wire drawing dies are arranged in a single wire drawing mechanism to continuously draw the wire, heat generated during wire drawing is absorbed by a cooling medium, and the influence of temperature change on the size of the wire drawing dies and the influence on the texture of the wire during wire drawing are reduced;

3. through the cooperation of one-level wire drawing die and first mounting hole, the cooperation of second level wire drawing die and second mounting hole can carry out automatic centering at the wire drawing in-process, and the axis of one-level wire drawing die and second level wire drawing die can draw close to the axis of cooling die chamber automatically, and then makes the one-level wire drawing die and second level wire drawing die can be autonomic keep coaxial, has ensured the precision of wire drawing.

Drawings

FIG. 1 is a schematic illustration of the manufacturing process of the present application;

fig. 2 is a schematic view of the overall structure of the fine drawing machine in the present application;

FIG. 3 is a schematic view of the cooling die box of the present application;

FIG. 4 is a schematic structural view of a wire drawing mechanism of the present application;

fig. 5 is a schematic structural view of the stretching mechanism in the present application.

Reference numerals: 1. a frame; 11. a wire inlet end; 12. a wire outlet end; 2. a protective cover; 21. a handle; 22. a hinge; 3. a wire drawing mechanism; 4. obliquely pulling the cylinder; 5. a guiding die box; 51. guiding the die head; 6. cooling the mold box; 61. cooling the mold cavity; 62. a first mounting hole; 63. a second mounting hole; 64. a first-stage wire-drawing die; 65. a second-stage wire drawing die; 66. a liquid inlet pipe; 67. a liquid discharge pipe; 68. a compression spring; 69. an end cap; 691. a pressure head; 7. a guide wheel set; 71. a pair of vertical guide posts; 72. a pair of transverse guide posts; 73. an adjustment column; 8. a stretching mechanism; 81. a driving wheel; 82. a driven wheel; 83. and (5) installing a rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

A production process of a hexagonal screw is shown in figure 1 and comprises the following steps:

a: drawing, namely feeding the steel bars into a drawing machine for drawing and coiling the steel bars on a wire frame to obtain a wire rod which is convenient to process;

b: annealing, namely feeding the wire rod obtained in the step A into an annealing furnace for annealing treatment;

c: acid washing, namely putting the wire rod annealed in the step B into a tank filled with acid washing liquid, and heating the acid washing liquid to 50-60 ℃ for acid washing for 5-15 min;

d: c, washing, namely washing the wire rod and the wire rod which are washed in the step C, hoisting the washed wire rod and the wire rod into a tank filled with a neutralizing solution, and neutralizing for 1-3min at normal temperature; then, the wire rod is firstly hung in a groove filled with clear water liquid and cleaned for 1min at normal temperature;

e: phosphorization: d, hoisting the wire rod cleaned in the step D into a tank filled with a phosphating solution, and phosphating for 8-12min at the temperature of 75-85 ℃;

f: saponification: e, hanging the wire rod washed by water into a groove filled with saponification liquid, and saponifying at the temperature of 75-80 ℃ for 3-7 min;

g: d, fine drawing, namely feeding the wire rod obtained in the step F into a fine drawing machine for multi-stage wire drawing treatment, so that the section diameter of the steel bar meets the processing standard;

h: g, heading, namely feeding the wire rod obtained in the step G into a heading machine to obtain a screw rough blank I with a hexagonal head;

i: clamping the tail, feeding the screw rough blank obtained in the step H into a tail clamping machine, and manufacturing a drill bit at the tail part of the screw rough blank I;

j: b, screwing, namely feeding the screw rough blank obtained in the step I into a thread rolling machine, and processing threads on the screw rough blank;

k: surface treatment, namely tempering after quenching the screw rough blank obtained in the step J;

l: and D, electroplating, namely electroplating the hexagonal screw obtained in the step K.

The finish drawing machine used in the finish drawing in the step G includes, as shown in fig. 2, a frame 1, a protective cover 2 covering a work table of the frame 1, three groups of wire drawing mechanisms 3 provided on the work table of the frame 1, and a drawing mechanism 8 for drawing a wire rod after wire drawing. One side of protection casing 2 rotates through hinge 22 and connects in order to realize turning over of protection casing 2 and close in frame 1, and the one end that the hinge 22 was kept away from to protection casing 2 is fixed with a plurality of handles 21 along the length direction welded of protection casing 2, conveniently opens and shuts protection casing 2.

Wire drawing mechanism 3 draws and refrigerated cooling die box 6 and for the wire rod provides traction's a section of thick bamboo 4 to one side including installing wire wheelset and the direction die box 5 of the adjustment wire rod trend on the table surface of frame 1, to the wire rod, and a section of thick bamboo 4 draws to one side through the motor drive who installs in frame 1, and the both ends of frame 1 are inlet wire end 11 and outlet wire end 12 respectively, cooling die box 6 is installed discharge port department of direction die box 5. The wire rod enters from the wire inlet end 11 of the frame 1 and sequentially passes through the guide die box 5 and the cooling die box 6 in the same group of wire drawing mechanisms 3 and is wound on the inclined drawing cylinder 4, then passes through the guide die box 5 of the next group of wire drawing mechanisms 3 from the inclined drawing cylinder 4, and then passes through the three groups of wire drawing mechanisms 3 and passes through the wire outlet end 12 of the frame 1 by bypassing the drawing mechanism 8.

Referring to fig. 3, the cooling die box 6 includes a cooling die cavity 61 disposed inside the cooling die box 6, a plurality of coaxial wire drawing dies are disposed in the cooling die cavity 61, and the plurality of wire drawing dies are disposed at intervals and are filled with a cooling medium between adjacent wire drawing dies. Referring to fig. 2, the cooling die cavity 61 is an overall cylindrical cavity opened inside the cooling die box 6, the wire-drawing die includes a primary wire-drawing die 64 and a secondary wire-drawing die 65 having a smaller wire-drawing diameter than the primary wire-drawing die 64, and the wire is drawn in one cooling die cavity 61 through two wire-drawing dies; the first-stage wire drawing die 64 is arranged at one end, close to the guide die box 5, of the cooling die cavity 61, the second-stage wire drawing die 65 is arranged at one end, far away from the guide die box 5, of the cooling die cavity 61, a liquid inlet pipe 66 for introducing cooling lubricating oil into the cooling die cavity 61 and a liquid outlet pipe 67 for discharging the cooling lubricating oil are arranged between the first-stage wire drawing die 64 and the second-stage wire drawing die 65 in the cooling die cavity 61, the cooling lubricating oil is introduced between the first-stage wire drawing die 64 and the second-stage wire drawing die 65 to serve as a cooling medium, temperature changes of a wire and the wire drawing die are reduced, and temperature influence on the wire drawing process is.

The outer contours of the first-stage wire-drawing die 64 and the second-stage wire-drawing die 65 are both in a circular truncated cone shape, a first mounting hole 62 matched with the outer contour of the first-stage wire-drawing die 64 and a second mounting hole 63 matched with the outer contour of the second-stage wire-drawing die 65 are respectively formed in two ends of the cooling die cavity 61, and the first mounting hole 62 and the second mounting hole 63 are two conical holes coaxial with the cooling die cavity 61. In the wire drawing process, the wire rod can provide axial pulling force for the first-stage wire drawing die 64 and the second-stage wire drawing die 65, so that the first-stage wire drawing die 64 is tightly matched with the first mounting hole 62, and the second-stage wire drawing die 65 is tightly matched with the second mounting hole 63, further the coaxiality of the first-stage wire drawing die 64 and the second-stage wire drawing die 65 can be ensured with the cooling die cavity 61, the coaxiality between the first-stage wire drawing die 64 and the second-stage wire drawing die 65 is improved, and the wire drawing quality is improved.

One end of the cooling die box 6, which is provided with the primary wire-drawing die 64, is provided with a cylindrical mounting hole for mounting the primary wire-drawing die 64, the secondary wire-drawing die 65 and the compression spring 68 into the cooling die cavity 61, one end of the cooling die box 6, which is provided with the mounting hole, is fixed with a plate-shaped end cover 69 through a bolt, one side of the end cover 69, which is close to the mounting hole, is integrally provided with a pressure head 691 in clearance fit with the mounting hole, the pressure head 691 abuts against the primary wire-drawing die 64, and the pressure head 691 and the end cover 69 are both provided with circular through holes which are coaxial with the cooling die; a compression spring 68 is inserted into the cooling die cavity 61, the compression spring 68 is in clearance fit with the cooling die cavity 61, two ends of the compression spring 68 are respectively abutted against the first-stage wire-drawing die 64 and the second-stage wire-drawing die 65, the first-stage wire-drawing die 64 can be abutted out during disassembly, and disassembly is convenient; feed liquor pipe 66 is located the bottom that cooling die cavity 61 is close to one-level drawing die 64 one end, and fluid-discharge pipe 67 is located the top that cooling die cavity 61 is close to second grade drawing die 65 one end, and the cooperation sets up compression spring 68 in cooling die cavity 61, and the cooling lubrication in cooling die cavity 61 has the liquid stream that can produce the spiral, can play better cooling and lubricated effect.

Referring to fig. 4, one side of the guide die box 5, which is away from the cooling die box 6, is provided with a guide wheel set 7 for adjusting the trend of the wire rod, the guide wheel set 7 includes a vertical guide column pair 71 fixed at one end of the guide die box 5, which is away from the cooling die box 6, for limiting the horizontal position of the wire rod, a horizontal guide column pair 72 for adjusting the height position of the wire rod axis, and an adjusting column 73 for adjusting the initial trend of the wire rod, the adjusting column 73 includes a vertically arranged shaft and a hollow cylinder sleeved on the shaft, and the vertical guide column pair 71 and the horizontal guide column pair 72 both include two drum-type guide column bodies similar to the adjusting column 73 in structure.

The guide die box 5 is internally provided with a long cylindrical guide die head 51 which is coaxial with the first-stage wire drawing die 64 and the second-stage wire drawing die 65, a cylindrical guide hole which is in clearance fit with the wire rod is coaxially arranged in the guide die head 51 in a penetrating manner, the guide hole is coaxial with the cooling die cavity 61, and the guide die head 51 is arranged to further improve the precision of the movement track of the wire rod when the wire rod enters the cooling die box 6 and ensure the stability of the movement of the wire rod.

Referring to fig. 5, the stretching mechanism 8 includes a driving wheel 81, a driven wheel 82 and a mounting rod 83 fixed on the frame 1, the driving wheel 81 is driven by a motor, the driving wheel 81 is coaxially fixed on a motor shaft of the motor, the motor is installed inside the frame 1, the wire is wound on the driving wheel 81 and the driven wheel 82, and the driven wheel 82 is rotatably connected on the mounting rod 83.

The implementation principle of the hexagonal screw production process related to the embodiment of the application is as follows: the wire is subjected to multistage wire drawing by increasing the number of wire drawing dies in the finish drawing machine, the deformation of the single-time wire drawing is reduced, the heat generated after wire drawing is further reduced, the wire is timely cooled by cooling lubricating oil between a first-stage wire drawing die 64 and a second-stage wire drawing die 65 and lubricated so as to facilitate the wire to enter the next-stage wire drawing die; the cone-shaped first-stage wire drawing die 64 and the cone-shaped second-stage wire drawing die 65 are matched with the first mounting hole 62 and the second mounting hole 63, so that the axes of the first wire drawing die and the second wire drawing die can be automatically aligned in the wire drawing process, smooth wire drawing is guaranteed, and the quality of a wire rod which is drawn is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.