CN111618224A - Cold heading rotary die - Google Patents

Cold heading rotary die Download PDF

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Publication number
CN111618224A
CN111618224A CN202010476014.6A CN202010476014A CN111618224A CN 111618224 A CN111618224 A CN 111618224A CN 202010476014 A CN202010476014 A CN 202010476014A CN 111618224 A CN111618224 A CN 111618224A
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China
Prior art keywords
die
die body
cold
pore passage
rotary
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Pending
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CN202010476014.6A
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Chinese (zh)
Inventor
李志强
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Liangang Precision Technology China Co ltd
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Liangang Precision Technology China Co ltd
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Priority to CN202010476014.6A priority Critical patent/CN111618224A/en
Publication of CN111618224A publication Critical patent/CN111618224A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)

Abstract

The invention relates to the technical field of cold heading dies, in particular to a cold heading rotary die which comprises a die body 1, wherein a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 penetrating through the die body 1 is arranged in the die cavity 2; the first pore passage 3 comprises a pore passage A3-1, n pore passages B3-2 and a pore passage C3-3 which are sequentially and continuously connected, the projection of the starting point of the pore passage A3-1 on the bottom of the die body 1 and the end point of the pore passage C3-3 form a central angle of a corresponding arc which takes the center of the bottom of the die body 1 as the center of a circle as 90 degrees, wherein n is any natural number. The cold heading rotary die can realize the rotation of the cut material, and the subsequent forming processing of the cut material is convenient; the DC53 is selected as the material of the die body, so that the die body has excellent hardness and toughness, and the service life of the cold heading rotary die is prolonged; meanwhile, the design idea is ingenious, the structure is simple, and the operation is convenient.

Description

Cold heading rotary die
Technical Field
The invention relates to the technical field of cold heading dies, in particular to a cold heading rotary die.
Background
The cold heading is a forging method for upsetting and forming a metal bar at normal temperature by utilizing a die. The heads, which are commonly used to make screws, bolts, rivets, etc., may be used in addition to or instead of machining. The forging stock material can be copper, aluminum, carbon steel, alloy steel, stainless steel, titanium alloy and the like, and the material utilization rate can reach 80-90%. The cold heading is mostly carried out on a special cold heading machine, so that the continuous, multi-station and automatic production is convenient to realize. The bar stock is automatically fed to a certain depth by the feeding mechanism, cut into blanks by the cutting mechanism, and then sequentially conveyed to the accumulating profiling and punching stations by the clamp conveying mechanism for cold heading forming. The main advantages of cold heading are as follows: the cold heading can be processed to adapt to smaller loads and shorter spans. Unusual cross-sectional shapes can be economically obtained by cold heading, and a satisfactory strength-to-weight ratio is obtained. Considering the compactness of packaging and shipping, nestable sections can be produced. The influence of stretching deformation is avoided under the action of environmental gravity. The cold-heading rotary die is a die for cutting, preforming and molding a blank material into a cold-formed product on a cold heading machine.
However, the conventional cold heading multi-station machine divides the shearing structure into vertical cutting and transverse cutting. The material shearing result directly affects the quality of the subsequent continuous production. Considering from the cold heading technology, the shorter the shearing and tearing stroke is, the higher the shearing quality is, thereby better ensuring the product quality and the subsequent multi-station production. However, due to the difference of the shearing structures of the machine stations, it is extremely costly to find a suitable shearing effect by purchasing the machine stations, and the shearing structure of the machine stations cannot be modified. Therefore, the innovative invention of the die structure to solve the defects of the machine shearing structure is an optimized and most economical implementation measure.
Disclosure of Invention
Aiming at some problems in the prior art, the invention provides a cold heading rotary die in a first aspect, which comprises a die body 1, wherein a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 penetrating through the die body 1 is arranged in the die cavity 2; the first pore passage 3 comprises a pore passage A3-1, n pore passages B3-2 and a pore passage C3-3 which are sequentially and continuously connected, the projection of the starting point of the pore passage A3-1 on the bottom of the die body 1 and the end point of the pore passage C3-3 form a central angle of a corresponding arc which takes the center of the bottom of the die body 1 as the center of a circle, wherein n is any natural number.
As a preferred technical scheme of the invention, the cross section of the die cavity 2 is composed of a plurality of arcs A2-1 and arcs B2-2 which are alternately distributed, and the arcs A2-1 and the arcs B2-2 are smoothly connected.
As a preferable technical scheme of the invention, the arc A2-1 and the arc B2-2 are circumscribed.
As a preferable technical solution of the present invention, a first opening groove 6 and a second opening groove 7 are symmetrically arranged on the outer side of the mold body 1, and the first opening groove 6 and the second opening groove 7 are symmetrical with respect to a vertical central axis of the mold body 1.
As a preferred technical solution of the present invention, a second duct 4 is further disposed inside the mold cavity 2.
As a preferred technical solution of the present invention, the mold body 1 includes a first mold body 1-1 and a second mold body 1-2; the first die body 1-1 and the second die body 1-2 are integrally connected.
In a preferred embodiment of the present invention, the diameter of the first casing 1-1 is greater than the diameter of the second casing 1-2.
As a preferable technical scheme of the invention, the top edge of the die body 1 is provided with a chamfer 5.
As a preferable technical scheme of the invention, the material of the cold heading rotary die is die steel.
As a preferred technical solution of the present invention, the mold steel comprises the following components: 0.9-1.1 wt% of carbon, 0.8-1 wt% of silicon, 0.3-0.35 wt% of manganese, 7-9 wt% of chromium, 1.5-2.2 wt% of molybdenum, 0.2-0.3 wt% of vanadium, 0.006-0.008 wt% of phosphorus, and the balance of iron.
Compared with the prior art, the invention has the following beneficial effects:
the cold heading rotary die provided by the invention can realize the rotation of the cut material, and is convenient for the subsequent forming processing of the cut material; the DC53 is selected as the material of the die body, so that the die body has excellent hardness and toughness, and the service life of the cold heading rotary die is prolonged; meanwhile, the design idea is ingenious, the structure is simple, and the operation is convenient.
Drawings
FIG. 1 is a schematic structural view of a longitudinal section of a cold heading rotary die according to the present invention;
FIG. 2 is a schematic structural view of a cross section of a cold heading rotary die according to the present invention;
wherein, 1-die body; 2-a mold cavity; 3-a first porthole; 4-a second porthole; 5-chamfering; 6-a first open slot; 7-a second open slot; 1-1-a first mold body; 1-2-a second mold body; 2-1-arc A; 2-2-arc B; 3-1-pore channel A; 3-2-channel B; 3-3-channel C
Detailed Description
Unless otherwise indicated, implied from the context, or customary in the art, all parts and percentages herein are by weight and the testing and characterization methods used are synchronized with the filing date of the present application. To the extent that a definition of a particular term disclosed in the prior art is inconsistent with any definitions provided herein, the definition of the term provided herein controls.
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.
The words "preferred", "preferably", "more preferred", and the like, in the present invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
The invention provides a cold heading rotary die, which comprises a die body 1, wherein a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 penetrating through the die body 1 is arranged in the die cavity 2; the first pore passage 3 comprises a pore passage A3-1, n pore passages B3-2 and a pore passage C3-3 which are sequentially and continuously connected, the projection of the starting point of the pore passage A3-1 on the bottom of the die body 1 and the end point of the pore passage C3-3 form a central angle of a corresponding arc which takes the center of the bottom of the die body 1 as the center of a circle, wherein n is any natural number.
The shape of the mold body 1 is not particularly limited and may be conventionally selected by those skilled in the art as needed.
Preferably, the mould body 1 is cylindrical in shape.
The shapes of the track of the duct A3-1, the duct B3-2 and the duct C3-3 are not particularly limited, and can be selected conventionally by a person skilled in the art as long as the central angle of a corresponding arc which is formed by the projection of the starting point of the duct A3-1 on the bottom of the die body 1 and the end point of the duct C3-3 and takes the center of the bottom of the die body 1 as the center of a circle is 90 degrees.
The applicant unexpectedly finds that the quality of the shearing result is high when the central angle of an arc which is formed by the projection of the starting point of the pore canal A3-1 at the bottom of the die body 1 and the end point of the pore canal C3-3 and corresponds to the center of the bottom of the die body 1 as the center of a circle is 90 degrees, and the applicant considers that the possible reason is that the shearing can rotate in the die cavity when the central angle of an arc which is formed by the projection of the starting point of the pore canal A3-1 at the bottom of the die body 1 and corresponds to the end point of the pore canal C3-3 and corresponds to the center of the bottom of the die body 1 as the center of a circle is 90 degrees, and the rotation angle is just 90 degrees, so that the shearing and tearing stroke is short, the transverse cutting and the vertical cutting of the shearing of the traditional cold heading multi.
In one embodiment, as shown in FIG. 2, the cross-section of the mold cavity 2 is formed by a plurality of arcs A2-1 and B2-2 alternately distributed, and the arcs A2-1 and B2-2 are smoothly connected.
Preferably, the arc A2-1 and the arc B2-2 circumscribe; more preferably, the arcs A2-1 and B2-2 open in opposite directions.
The number of the arcs A2-1 and B2-2 is not particularly limited and may be selected by those skilled in the art.
The applicant has surprisingly found that when the cross section of the die cavity 2 is formed by a plurality of arcs A2-1 and B2-2 which are alternately distributed, the arcs A2-1 and B2-2 are circumscribed and the opening directions of the arcs A2-1 and B2-2 are opposite, the quality of the material shearing result is high, and the material shearing is facilitated to be processed, and the applicant believes that the possible reason is that the arcs A2-1 and B2-2 are circumscribed and the opening directions are opposite, and the material shearing is continuously and alternately distributed, so that when the material shearing enters the die body 1, the friction force of the material shearing is rapidly reduced, the shearing stress on the material shearing is reduced, and the material shearing can be processed smoothly and stably. In addition, the cross section design of the die cavity 2 enables the die cavity to be in contact with the shearing materials and directly participate in the deformation process, and in the shearing material processing process, the stress generated by the die cavity generates complex expansion resistance under the action of static high-pressure strong impact, so that the shearing materials are smoothly processed.
In one embodiment, the mold body 1 includes a first mold body 1-1 and a second mold body 1-2; the die body 1-1 and the die body 1-2 are integrally connected.
Preferably, the diameter of the first mold body 1-1 is larger than that of the second mold body 1-2.
In using the rotary die of the present invention, the rotary die is placed in a housing.
The diameter of the first die body 1-1 is larger than that of the second die body 1-2, so that the rotary die is firmly connected with the shell, and the rotary die moves in the axial direction without falling off.
In one embodiment, the mold body 1 is provided with a first opening groove 6 and a second opening groove 7 on the outer side.
Preferably, the first opening groove 6 and the second opening groove 7 are symmetrical about a vertical central axis of the mold body 1.
The first opening groove 6 and the second opening groove 7 of the present invention further ensure the close fixation of the rotary die during use.
In one embodiment, a second duct 4 is also provided inside the cavity 2.
The duct 4 of the invention ensures that the rotary die enters and exits the main die in the using process.
In one embodiment, the top edge of the mold body 1 is provided with a chamfer 5.
In one embodiment, the material of the cold heading rotary die is die steel.
Die steel is a steel grade used for manufacturing dies such as cold stamping dies, hot forging dies, die casting dies and the like. The die is a main processing tool for manufacturing parts in industrial departments of mechanical manufacturing, radio instruments, motors, electric appliances and the like. The quality of the die directly affects the quality of the pressure processing technology, the precision yield of products and the production cost, and the quality and the service life of the die are mainly affected by die materials and heat treatment except by reasonable structural design and processing precision.
Preferably, the mould steel comprises the following components: 0.9-1.1 wt% of carbon, 0.8-1 wt% of silicon, 0.3-0.35 wt% of manganese, 7-9 wt% of chromium, 1.5-2.2 wt% of molybdenum, 0.2-0.3 wt% of vanadium, 0.006-0.008 wt% of phosphorus, and the balance of iron; more preferably, the mold steel comprises the following components: 1.0 wt% carbon, 0.91 wt% silicon, 0.32 wt% manganese, 8 wt% chromium, 2 wt% molybdenum, 0.28 wt% vanadium, 0.007 wt% phosphorus, and the balance iron.
The die steel is DC 53.
The applicant has surprisingly found that when using a mould steel comprising the following components: the cold heading rotary die is characterized by comprising 0.9-1.1 wt% of carbon, 0.8-1 wt% of silicon, 0.3-0.35 wt% of manganese, 7-9 wt% of chromium, 1.5-2.2 wt% of molybdenum, 0.2-0.3 wt% of vanadium, 0.006-0.008 wt% of phosphorus and the balance of iron, wherein when die steel is DC53, the service life of the obtained cold heading rotary die is long.
The preparation method of the cold heading rotary die can be selected by persons skilled in the art conventionally.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
Examples
Example 1
Embodiment 1 of the present invention provides a cold-heading rotary die, as shown in fig. 1, which includes a cylindrical die body 1, the top edge of which is provided with a chamfer 5; a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 and a second pore passage 4 which penetrate through the die body 1 are arranged in the die cavity 2; the first pore channel 3 comprises a pore channel A3-1, 1 pore channel B3-2 and a pore channel C3-3 which are sequentially and continuously connected, and the central angle of a corresponding arc which is formed by the projection of the starting point of the pore channel A3-1 at the bottom of the die body 1 and the end point of the pore channel C3-3 and takes the center of the bottom of the die body 1 as the center of a circle is 90 degrees; the die body 1 comprises a first die body 1-1 and a second die body 1-2 which are integrally connected, and the diameter of the first die body 1-1 is larger than that of the second die body 1-2.
As shown in fig. 2, the cross section of the die cavity 2 is composed of 4 arcs A2-1 and B2-2 which are alternately distributed, the arcs are smoothly connected, the arcs A2-1 and the arcs B2-2 are circumscribed, and the opening directions are opposite; the die body 1 is provided with a first opening groove 6 and a second opening groove 7 on the outer side, and the first opening groove 6 and the second opening groove 7 are symmetrical about a vertical central axis of the die body 1.
The material of the cold heading rotary die is DC 503.
Example 2
The embodiment 2 of the invention provides a cold heading rotary die, which comprises a cylindrical die body 1, wherein the top edge of the cylindrical die body is provided with a chamfer 5; a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 and a second pore passage 4 which penetrate through the die body 1 are arranged in the die cavity 2; the first pore channel 3 comprises a pore channel A3-1 and a pore channel C3-3 which are sequentially and continuously connected, the central angle of a corresponding arc which is formed by the projection of the starting point of the pore channel A3-1 on the bottom of the die body 1 and the end point of the pore channel C3-3 and takes the center of the bottom of the die body 1 as the center of a circle is 90 degrees, and the pore channel A3-1 and the pore channel C3-3 are respectively arc-shaped; the die body 1 comprises a first die body 1-1 and a second die body 1-2 which are integrally connected, and the diameter of the first die body 1-1 is larger than that of the second die body 1-2.
The cross section of the die cavity 2 is respectively composed of 4 arcs A2-1 and B2-2 which are alternately distributed, the arcs A2-1 and the arcs B2-2 are smoothly connected, the arcs A2-1 and the arcs B2-2 are externally tangent, and the opening directions are opposite; the die body 1 is provided with a first opening groove 6 and a second opening groove 7 on the outer side, and the first opening groove 6 and the second opening groove 7 are symmetrical about a vertical central axis of the die body 1.
The material of the cold heading rotary die is DC 503.
Practice ofExample 3
Embodiment 3 of the present invention provides a cold heading rotary die, which includes a cylindrical die body 1, the top edge of which is provided with a chamfer 5; a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 and a second pore passage 4 which penetrate through the die body 1 are arranged in the die cavity 2; the first pore channel 3 is parallel to the vertical central axis of the die body 1; the die body 1 comprises a first die body 1-1 and a second die body 1-2 which are integrally connected, and the diameter of the first die body 1-1 is larger than that of the second die body 1-2.
The cross section of the die cavity 2 is respectively composed of 4 arcs A2-1 and B2-2 which are alternately distributed, the arcs A2-1 and the arcs B2-2 are smoothly connected, the arcs A2-1 and the arcs B2-2 are externally tangent, and the opening directions are opposite; the die body 1 is provided with a first opening groove 6 and a second opening groove 7 on the outer side, and the first opening groove 6 and the second opening groove 7 are symmetrical about a vertical central axis of the die body 1.
The material of the cold heading rotary die is DC 503.
Example 4
Embodiment 4 of the present invention provides a cold-heading rotary die, which includes a cylindrical die body 1, the top edge of which is provided with a chamfer 5; a die cavity 2 is arranged at the center of the top of the die body 1, and a first pore passage 3 and a second pore passage 4 which penetrate through the die body 1 are arranged in the die cavity 2; the first pore channel 3 comprises a pore channel A3-1, 1 pore channel B3-2 and a pore channel C3-3 which are sequentially and continuously connected, and the central angle of a corresponding arc which is formed by the projection of the starting point of the pore channel A3-1 at the bottom of the die body 1 and the end point of the pore channel C3-3 and takes the center of the bottom of the die body 1 as the center of a circle is 90 degrees; the die body 1 comprises a first die body 1-1 and a second die body 1-2 which are integrally connected, and the diameter of the first die body 1-1 is larger than that of the second die body 1-2.
The cross section of the die cavity 2 is respectively composed of 4 arcs A2-1 and B2-2 which are alternately distributed, the arcs A2-1 and the arcs B2-2 are smoothly connected, the arcs A2-1 and the arcs B2-2 are externally tangent, and the opening directions are the same; the die body 1 is provided with a first opening groove 6 and a second opening groove 7 on the outer side, and the first opening groove 6 and the second opening groove 7 are symmetrical about a vertical central axis of the die body 1.
The material of the cold heading rotary die is DC 503.
Example 5
Embodiment 5 of the present invention provides a cold heading rotary die, which is the same as embodiment 1 in specific implementation manner, except that the cold heading rotary die is made of SKD 11.
Performance evaluation
1. The processing quality of the cut material is as follows: the cold heading rotary die obtained in the embodiments 1-5 is used for making up the defects of the machine caused by shearing in the process of machining the shearing, wherein the shearing form is optimized in the process of machining the shearing, and finally, the machining quality of the shearing is evaluated, and the evaluation standard is A grade: the quality of the material shearing result is good and the material shearing method is flawless; b stage: the quality of the material shearing result is good, and the number of defects is 1-5; c level: the quality of the material shearing result is poor.
2. Service life: the cold heading rotary die obtained in the embodiments 1 to 5 is continuously used for 1 year, and the abrasion condition is evaluated according to the following evaluation criteria: a level: no abrasion is caused; b stage: the abrasion is small, and the cold heading rotary die can be normally used; c level: the abrasion is large, and the normal use cannot be realized.
TABLE 1
Figure BDA0002515857290000071
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may modify or change the technical content of the above disclosure into equivalent embodiments with equivalent changes, but all those simple modifications, equivalent changes and modifications made according to the technical spirit of the present invention do not depart from the technical content of the present invention, and still fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. A cold heading rotary die is characterized by comprising a die body, wherein a die cavity is arranged at the center of the top of the die body, and a first pore passage penetrating through the die body is arranged in the die cavity; the first pore passage comprises a pore passage A, n, a pore passage B and a pore passage C which are sequentially and continuously connected, the projection of the starting point of the pore passage A on the bottom of the die body and the end point of the pore passage C form a central angle of a corresponding arc which takes the center of the bottom of the die body as the center of a circle, wherein n is any natural number.
2. The cold-heading rotary die of claim 1, wherein the cross-section of the die cavity is comprised of a plurality of alternating arcs a and B, the arcs a and B being smoothly connected.
3. The cold-heading rotary die of claim 2, wherein arc a and arc B circumscribe.
4. A cold-heading rotary die according to any one of claims 1 to 3, wherein the outside of the die body is provided with a first opening groove and a second opening groove which are symmetrical with respect to a vertical central axis of the die body.
5. The cold-heading rotary die of claim 1, wherein the die cavity is further provided with a second bore therein.
6. A cold-heading rotary die according to any one of claims 1 to 3, wherein the die bodies include a first die body and a second die body; the first mold body and the second mold body are integrally connected.
7. A cold-heading rotary die according to claim 6, wherein said first die body has a diameter greater than a diameter of said second die body.
8. A cold-heading rotary die according to claim 6, wherein the top edge of the die body is chamfered.
9. The rotary cold-heading die as claimed in claim 1, wherein the rotary cold-heading die is made of die steel.
10. The cold-heading rotary die of claim 9, wherein the die steel comprises the following composition: 0.9-1.1 wt% of carbon, 0.8-1 wt% of silicon, 0.3-0.35 wt% of manganese, 7-9 wt% of chromium, 1.5-2.2 wt% of molybdenum, 0.2-0.3 wt% of vanadium, 0.006-0.008 wt% of phosphorus, and the balance of iron.
CN202010476014.6A 2020-05-29 2020-05-29 Cold heading rotary die Pending CN111618224A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010476014.6A CN111618224A (en) 2020-05-29 2020-05-29 Cold heading rotary die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010476014.6A CN111618224A (en) 2020-05-29 2020-05-29 Cold heading rotary die

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Publication Number Publication Date
CN111618224A true CN111618224A (en) 2020-09-04

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CN202010476014.6A Pending CN111618224A (en) 2020-05-29 2020-05-29 Cold heading rotary die

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