阅读说明：本技术 一种冷镦旋转模 (Cold heading rotary die ) 是由 李志强 于 2020-05-29 设计创作，主要内容包括：本发明涉及冷镦模技术领域,更具体地,本发明涉及一种冷镦旋转模,其包括模体1,所述模体1顶部的中心位置设置有模腔2,模腔2内部设置有贯穿模体1的第一孔道3；所述第一孔道3包括依次连续连接的孔道A 3-1、n个孔道B3-2和孔道C 3-3,孔道A 3-1起点在模体1底部的投影与孔道C 3-3的终点形成的以模体1底部中心为圆心的所对应弧的圆心角为90°,其中n为任意自然数。所述的冷镦旋转模能够实现剪料的旋转,方便后续的剪料的成型加工；选择DC53作为模体的材质,使之具有优异的硬度和韧性,延长了冷镦旋转模的使用寿命；同时,该设计思路巧妙,结构简单,操作方便。(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.)

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.

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.