CN218963611U - Petroleum perforating bullet shell wedge cross rolling blind hole rolling forming device - Google Patents
Petroleum perforating bullet shell wedge cross rolling blind hole rolling forming device Download PDFInfo
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- CN218963611U CN218963611U CN202223515740.8U CN202223515740U CN218963611U CN 218963611 U CN218963611 U CN 218963611U CN 202223515740 U CN202223515740 U CN 202223515740U CN 218963611 U CN218963611 U CN 218963611U
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Abstract
The utility model relates to the technical field of metal plastic forming technology and equipment, and provides a petroleum perforating bullet shell cross wedge rolling blind hole rolling forming device, which comprises two core rods, two plate type cross wedge rolling dies, a core rod driving unit, a die driving unit and a control unit; the two cross wedge rolling dies drive the rolled piece to rotate so as to form the shape of the outer surface of the rolled piece, and the two core rods have dynamically adjustable axial feeding movement, so that the rolling process is divided into three stages: firstly, rolling a coreless rod to obtain a blind hole optical axis with a concave center; secondly, forming the inner surface and the outer surface of the shell blank by moving the core rod; thirdly, cutting and rolling to obtain two petroleum perforating bullet shells through coreless rods. The utility model has the characteristics of 95% of material utilization rate, 0.1mm of forming precision, 20 rolling efficiency per minute, improved organization performance through severe plastic deformation, low cost and good product performance in the field of large-scale small-sized shells, and has good industrialization prospect.
Description
Technical Field
The utility model relates to the technical field of metal plastic forming technology and equipment, in particular to a device for rolling and forming a blind hole of a petroleum perforating bullet shell by cross wedge rolling.
Background
The petroleum perforating bullet is a key part on petroleum perforating equipment, the bullet shell is one of core parts of the perforating bullet, steel materials are generally adopted, and the steel materials are key parts for bearing shaped charge liners, explosive, primary explosive and connecting bullet holders. In the explosion process, the main function of the method is to enhance the impulse of lateral detonation waves of the perforating bullet, improve the kinetic energy of the metal jet, delay and reduce the interference of sparse waves on the metal jet, play an important role in energy accumulation, and further ensure the perforation depth. With the continuous improvement of perforation technology, not only is the penetration aperture required to be regular and deep, but also no pestle is required to be blocked in the perforating gun, and particularly, how to form the petroleum perforating bullet shell with high performance and high efficiency becomes a key technical problem in consideration of the fact that the strength of a bullet body directly influences the penetration value of the perforating bullet.
The traditional method for processing the shell mainly comprises three methods of machining, cold extrusion and hot die forging. Because the elastomer structure is complex, the machining cost is extremely high, the production efficiency is low, and the actual production requirement cannot be met; the adoption of the cold extrusion technology improves the production efficiency and relatively reduces the production cost, but the selection of the elastomer materials is greatly limited, the process manufacturing cost is higher, at present, only 20 steel can be used for manufacturing the elastomer through cold extrusion, the mechanical property of the 20 steel elastomer is lower, the perforation penetration is unstable, the size of fragments after the explosion of the elastomer is larger, the well clamping accident is very easy to occur, and the salvaging operation cost is increased; and by adopting hot die forging, the forging force is larger, so that the die loss is larger.
In view of the fact that the petroleum perforating bullet is an easy-to-consume industrial product, the cross wedge rolling process has the characteristics of large batch and small specification, and has remarkable economic advantages. Compared with the traditional forging process, extrusion process and mechanical processing process for producing the revolving body, the cross wedge rolling has the advantages of high production efficiency and material utilization rate, stable product forming quality, good tissue performance and the like, and particularly, the cross wedge rolling with the core rod controls the performance of a rolled piece through inner and outer cooperative rolling, has been widely paid attention in the field of light weight in recent years, and is industrially applied to a plurality of fields such as weapons, aerospace, ships, chemical industry, light industry, civil use and the like.
Taking a petroleum perforating bullet shell as an example, the cross wedge rolling process based on core rod control mainly has the following advantages: firstly, the mandrel is adopted to act and roll internally and externally in a coordinated manner, and the large-area shrinkage rate rolling is adopted to increase the plastic strain, so that the mechanical property of the shell is obviously improved, and the penetration value of the perforating bullet is improved; on the basis of the rapid process of cross wedge rolling, if 2 products are rolled at one time by adopting symmetrical rolling, the manufacturing efficiency can reach 20 products/min, and the high-speed forming ensures that the temperature drop in the rolling process is smaller, thereby ensuring the stable performance of the products. However, the existing cross wedge rolling process can only form solid shaft parts or through hole shaft parts, blind hole parts cannot be formed temporarily, and the existing technical implementation scheme is not available for disc-shaped parts with blind holes, such as petroleum perforating bullet shells.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the utility model and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the utility model, which should not be used to limit the scope of the utility model.
In view of the above and/or existing problems, the utility model provides a device for rolling and forming a blind hole of a petroleum perforating bullet shell by cross wedge rolling. The utility model realizes the rolling with large area reduction rate and improves the material performance through secondary wedging, and adopts the mode of cutting-off symmetrical rolling to obtain two petroleum perforating bullet shells through one-time rolling, thereby realizing high-efficiency precise wedge cross rolling of the petroleum perforating bullet shells.
The utility model adopts the following technical scheme:
the blind hole rolling forming device for the cross wedge rolling of the petroleum perforating bullet shell comprises two plate-type cross wedge rolling dies, two core rods, a die driving unit, a core rod driving unit and a control unit;
the two plate-type cross wedge rolling dies are provided with opposite linear motions at equal speed, are respectively arranged at two radial sides of the solid round bar stock, are used for rolling the solid round bar stock rolled piece in the rolling process to form the outline dimension of the petroleum perforating bullet shell, and are used for cutting to obtain the two petroleum perforating bullet shells;
the two core rods are provided with constant-speed opposite linear feeding motions in the axial direction and follow-up rotary motions in the circumferential direction, are respectively arranged at two axial sides of the solid round bar and are used for controlling concave defects and forming the geometric dimension of an inner hole of the oil perforating bullet shell in the rolling process;
the die driving unit is in signal connection with the two cross wedge rolling dies and is used for controlling the constant-speed opposite linear movement of the two cross wedge rolling dies;
the core rod driving unit is in signal connection with the two core rods and is used for controlling the two core rods to move in opposite directions at the same speed;
and the control unit is in signal connection with the die driving unit and the mandrel driving unit.
Any one of the possible implementation manners described above further provides an implementation manner, wherein the inner hole of the oil perforating bullet shell comprises a cylindrical inner hole section, a round platform-shaped inner hole section and a spherical end surface which are sequentially connected, and the outer surface comprises a large-diameter round rod section, a round platform transition section, a circular arc-shaped platform section and a small-diameter round rod section which are sequentially connected.
Any one possible implementation manner of the method is further provided, wherein the two plate-type cross wedge rolling dies are rectangular thick plates with the same geometric dimension, and are provided with convex wedges which are symmetrically arranged by taking solid round bars as symmetry axes;
the plate type wedge cross rolling die is of a secondary wedging structure and sequentially comprises a feeding section, a first wedging section, a widening section, a second wedging section, a finishing section and a cutting section;
the feeding section is used for limiting the solid round bar rolled piece heated to the deformation temperature to a cross wedge rolling processing position;
the first wedging section is used for radially compressing metal in a deformation zone of the rolled piece so as to bite the plate type wedge cross rolling die into the rolled piece;
the widening section is used for axially expanding metal in a deformation zone of the rolled piece and preforming the rolled piece into a blind hole optical axis with a concave defect;
the second wedging section enables metal in a deformation zone of the rolled piece to continuously radially compress, the plate type wedge cross rolling die is bitten into the optical axis of the blind hole, and the shape of the outer surface of the petroleum perforating bullet shell is formed;
the finishing section is used for accurately forming geometric dimensions of the rolled piece and forming the optical axis of the blind hole into two petroleum perforating bullet shell blanks with connected middle parts;
and the cutting section is used for cutting off the metal in the connecting area in the middle of the blank of the two petroleum perforating bullet shells to obtain the two petroleum perforating bullet shells.
Any one of the possible implementations described above further provides an implementation wherein the first wedging section is an axially widening, progressively rising triangular rib; the second wedging section is a trapezoid convex rib which is widened axially and gradually raised; the cutting section is a rectangular convex rib which is gradually raised and then straightened.
Any one of the possible implementation manners described above, further provides an implementation manner, wherein the two core rods are variable-section core rods with the same geometric dimension; the length of the core rod is larger than the depth of the blind hole of the oil perforating bullet shell, and the shape of the core rod is consistent with the shape of the blind hole of the oil perforating bullet shell; the two core rods are symmetrically arranged at two sides of the solid round bar material in the axial direction.
In any of the possible implementations described above, there is further provided an implementation in which the axis of the mandrel coincides with the axis of the solid round bar.
In any of the possible implementations described above, there is further provided an implementation in which the two plate-type cross wedge rolling dies are identical in shape.
In any of the possible implementations described above, there is further provided an implementation in which both of the plate-type cross wedge rolling dies are disposed horizontally.
In any of the possible implementations described above, there is further provided an implementation, the control unit is a computer.
In any one of the possible implementation manners described above, there is further provided an implementation manner, wherein the solid round bar material is steel, aluminum alloy, titanium alloy or magnesium alloy.
The utility model relates to a roll forming process for a blind hole in a cross wedge rolling of a petroleum perforating bullet shell, which comprises the following steps:
s1, according to a principle of conservation of volume, calculating the volume of a shell of the petroleum perforating bullet to obtain the blanking size of a solid round bar;
s2, designing two plate-type cross wedge rolling dies according to the outer surface size of the petroleum perforating bullet shell, and designing the outline size of two core rods according to the inner hole geometric size of the petroleum perforating bullet shell; the petroleum perforating bullet shell is a conical blind hole shaft with variable inner and outer diameters;
s3, heating the solid round bar to a set deformation temperature;
s4, placing the solid round bar material between two dies, and respectively placing two core rods at two ends of the solid round bar material; the axis of the core rod is coincident with the axis of the solid round bar;
s5, rolling: the two plate-type cross wedge rolling dies do opposite constant-speed linear motion, the two core rods do follow-up rotary motion in the circumferential direction, dynamic adjustable axial feeding motion is arranged in the axial direction, solid round bar materials are symmetrically rolled and formed under the combined action of the plate-type cross wedge rolling dies and the core rods, and the two petroleum perforating bullet shells are obtained through cutting.
In step S5, the specific rolling process includes:
firstly, the two plate-type cross wedge rolling dies do opposite constant-speed linear motion, the two core rods do not axially contact with the solid round bar, and the solid round bar is rolled into a blind hole optical axis with a concave center defect;
step two, the two core rods are respectively contacted with two axial end surfaces of the optical axis of the blind hole, fed at a constant speed in opposite directions and axially driven to rotate, and the optical axis of the blind hole is symmetrically rolled and formed into two petroleum perforating bullet shell blanks with the middle parts connected under the combined action of the plate type cross wedge rolling die and the core rods;
and step three, separating the two core rods from the inner hole surfaces of the petroleum perforating bullet shell blanks, and cutting the two petroleum perforating bullet shell blanks connected with the middle part to obtain two petroleum perforating bullet shells.
The solid round bar stock is preformed into a blind hole optical axis through the feeding section, the first wedging section and the widening section, is formed into two petroleum perforating bullet shell blanks with connected middle parts through the second wedging section and the finishing section, and is finally formed into two petroleum perforating bullet shells through the cutting section.
In the step S3, the deformation temperature is 600-1300 ℃.
The beneficial effects of the utility model are as follows:
1. the method of rolling without a core rod and then rolling with a core rod is adopted, and the core temperature is obviously increased after rolling without the core rod, so that the core rod perforation jacking force during rolling with the core rod is reduced.
2. The method comprises the steps of firstly rolling without a mandrel and then rolling with the mandrel, firstly obtaining blind hole optical axes with two concave defects, and then reducing the wall thickness of the blind hole by utilizing the axial feeding of the mandrel, so that the cross wedge rolling forming of the thin-wall blind hole shaft is realized.
3. The rolling with large area reduction rate is realized by secondary wedging, the total area reduction rate exceeds 80 percent, the large plasticity induces the grain structure to be obviously refined, and the mechanical property of the shell of the petroleum perforating bullet is improved, thereby improving the penetration value of the perforating bullet.
4. The method has the advantages of high forming efficiency, high forming precision, 95% of rolling material utilization rate without stub bars, 0.1mm of forming precision and 20 pieces/min of rolling efficiency, and is particularly suitable for being applied to large-batch small-specification petroleum perforating bullet shell products and has good economical efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic diagram of a petroleum perforating charge case according to an embodiment.
Fig. 2 is a schematic diagram showing the overall structure and movement of a device for rolling a blind hole in a cross wedge rolling of a petroleum perforating bullet shell according to an embodiment.
FIG. 3 is a schematic diagram showing the operation of the apparatus for forming the shell of the petroleum perforating bullet according to the embodiment.
Fig. 4 is a schematic diagram illustrating the deformation process of the petroleum perforating bullet shell in an embodiment.
Fig. 5 is a schematic diagram showing a characteristic cross-sectional structure of two plate-type cross wedge rolling dies in the embodiment.
Fig. 6 is a schematic diagram showing the overall structure of two plate-type cross wedge rolling dies in the embodiment.
FIG. 7 is a schematic diagram showing the structure and dimensions of two mandrels in one embodiment.
In the figure: 1. a first plate type cross wedge rolling die; 2. a second plate type cross wedge rolling die; 3. a first mandrel; 4. a second core rod; 5. rolling the piece; 5a, solid round bar stock; 5b, a blind hole optical axis; 5c, a shell blank; 5d, petroleum perforating bullet shell; 5d1 is a cylindrical inner bore section; 5d2 is a circular truncated cone inner hole section; 5d3 is a spherical end face; 5d4 is a large-diameter round rod section; 5d5 is a truncated cone transition section; 5d6 is a circular arc stage; 5d7 is a small diameter round rod section; 1a is a first wedging bead; 1b is a second wedging bead; 1c is a cutting rib; X-X is the axis of the rolled piece and the axis of the core rod; Y-Y is the rolling center line of the cross wedge rolling die; v1 is the linear motion of the first plate type cross wedge rolling die; v2 is the linear motion of the second plate type cross wedge rolling die; v3 is the linear motion of the first core rod; v4 is the linear motion of the second core rod; i is a wedge cross rolling die feeding section; II is a first wedging section of the cross wedge rolling die; III is the width expanding section of the cross wedge rolling die; IV is a second wedging section of the cross wedge rolling die; v is a finishing section of the cross wedge rolling die; VI is a cutting section of the cross wedge rolling die.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the utility model. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
As shown in fig. 2, the blind hole rolling forming device for cross wedge rolling of the petroleum perforating bullet shell comprises two plate-type cross wedge rolling dies (a first plate-type cross wedge rolling die 1 and a second plate-type cross wedge rolling die 2), two core rods (a first core rod 3 and a second core rod 4), a die driving unit, a core rod driving unit and a control unit;
the two plate-type cross wedge rolling dies 1 and 2 are provided with opposite linear motions at equal speed, are respectively arranged at two radial sides of the solid round bar 5a, are used for rolling a solid round bar rolled piece in the rolling process to form the outline dimension of the petroleum perforating bullet shell 5d, and are used for cutting to obtain the two petroleum perforating bullet shells 5d; the inner hole of the petroleum perforating bullet shell 5d comprises a cylindrical inner hole section 5d1, a circular truncated cone-shaped inner hole section 5d2 and a spherical end face 5d3 which are sequentially connected, and the outer surface comprises a large-diameter round rod section 5d4, a circular truncated cone transition section 5d5, a circular arc-shaped stage 5d6 and a small-diameter round rod section 5d7 which are sequentially connected;
the two core rods 3 and 4 are provided with uniform-speed opposite linear feeding motion in the axial direction and follow-up rotary motion in the circumferential direction, are respectively arranged at two axial sides of the solid round bar 5a, and are used for controlling the concave defects and forming the geometric dimension of the inner hole of the petroleum perforating bullet shell 5d in the rolling process;
the die driving unit is in signal connection with the two cross wedge rolling dies 1 and 2 and is used for controlling the two cross wedge rolling dies 1 and 2 to move in opposite directions at equal speed;
the core rod driving unit is in signal connection with the two core rods 3 and 4 and is used for controlling the two core rods 3 and 4 to move in opposite directions at equal speed;
and the control unit is in signal connection with the die driving unit and the mandrel driving unit.
In a specific embodiment, the two plate-type cross wedge rolling dies 1 and 2 have the same shape, and the two core rods 3 and 4 have the same shape; the two plate-type cross wedge rolling dies 1 and 2 are horizontally arranged.
As shown in fig. 1-3, the utility model is used for carrying out the wedge cross rolling blind hole rolling forming process of the petroleum perforating bullet shell, which comprises the following steps:
s1, according to a principle of conservation of volume, calculating the volume of a shell 5d of the petroleum perforating bullet to obtain the blanking size of a solid round bar 5 a;
s2, designing two plate type cross wedge rolling dies 1 and 2 according to the outer surface size of the petroleum perforating bullet shell 5d, and designing the outline sizes of two core rods 3 and 4 according to the inner hole geometric size of the petroleum perforating bullet shell 5d; the petroleum perforating bullet shell 5d is a conical blind hole shaft with variable inner and outer diameters;
s3, heating the solid round bar 5a to a set deformation temperature;
s4, placing the solid round bar 5a between the two dies 1 and 2, and respectively placing the two core rods 3 and 4 at two ends of the solid round bar 5 a; the axes of the core rods 3 and 4 are coincident with the axis of the solid round bar 5 a;
s5, rolling: the two plate-type cross wedge rolling dies 1 and 2 do opposite constant-speed linear motion, the two core rods 3 and 4 do follow-up rotary motion in the circumferential direction, dynamic adjustable axial feeding motion is arranged in the axial direction, and the solid round bar 5a is symmetrically rolled and formed under the combined action of the plate-type cross wedge rolling dies 1 and 2 and the core rods 3 and 4 and is cut to obtain two petroleum perforating bullet shells 5d.
In a specific embodiment, as shown in fig. 1, the inner hole of the petroleum perforation bullet shell 5d comprises a cylindrical inner hole section 5d1, a circular truncated cone-shaped inner hole section 5d2 and a spherical end surface 5d3 which are sequentially connected, and the outer surface comprises a large-diameter circular rod section 5d4, a circular truncated cone transition section 5d5, a circular arc-shaped stage 5d6 and a small-diameter circular rod section 5d7 which are sequentially connected.
In a specific embodiment, as shown in fig. 4, the specific rolling process of step S5 includes:
firstly, the two plate-type cross wedge rolling dies 1 and 2 do opposite constant-speed linear motion V1 and V2, the two core rods 3 and 4 do not axially contact with the solid round bar 5a, and the solid round bar 5a is rolled into a blind hole optical axis 5b with a concave center defect;
step two, the two core rods 3 and 4 are respectively contacted with two axial end surfaces of the blind hole optical axis 5b, and are fed at equal speed in opposite directions (with movements V3 and V4), and axially perform follow-up rotation movement (around the axis X-X), and the blind hole optical axis 5b is symmetrically rolled and formed into two petroleum perforating bullet shell blanks 5c with connected middle parts under the combined action of the plate-type cross wedge rolling dies 1 and 2 and the core rods 3 and 4;
and step three, separating the two core rods 3 and 4 from the inner hole surface of the petroleum perforating bullet shell blank 5c, and cutting the two petroleum perforating bullet shell blanks 5c connected with the middle part to obtain two petroleum perforating bullet shells 5d.
In a specific embodiment, as shown in fig. 5, the two plate-type cross wedge rolling dies 1 and 2 are rectangular thick plates with the same geometric dimension, and the convex wedges of the two plate-type cross wedge rolling dies 1 and 2 are symmetrically arranged by taking a solid round bar 5a as a symmetry axis;
the plate type cross wedge rolling dies 1 and 2 are of a secondary wedging structure and sequentially comprise a feeding section I, a first wedging section II, a widening section III, a second wedging section IV, a finishing section V and a cutting section VI;
the feeding section I is used for limiting the solid round bar rolled piece heated to the deformation temperature to a cross wedge rolling processing position;
the first wedging section II is used for radially compressing metal in a deformation zone of the rolled piece so as to bite the plate type wedge cross rolling dies 1 and 2 into the rolled piece;
the widening section III is used for axially expanding metal in a deformation zone of the rolled piece and preforming the rolled piece into a blind hole optical axis 5b with a concave defect;
the second wedging section IV enables metal in a deformation zone of the rolled piece to continue to radially compress, the plate type wedge cross rolling dies 1 and 2 are bitten into the blind hole optical axis 5b, and the outer surface shape of the petroleum perforating bullet shell 5d is formed;
the finishing section V is used for precisely forming geometric dimensions of a rolled piece and forming the blind hole optical axis 5b into two petroleum perforating bullet shell blanks 5c with connected middle parts;
the cutting section VI is used for cutting off the metal in the middle connecting area of the two petroleum perforating bullet shell blanks 5c to obtain two petroleum perforating bullet shells 5d.
In one embodiment, as shown in fig. 6, the first wedging section ii is an axially widened, gradually raised triangular rib; the second wedging section IV is a trapezoid convex rib which is widened axially and gradually raised; the cutting section VI is a rectangular convex rib which is gradually raised and then straightened.
The solid round bar 5a is preformed into a blind hole optical axis 5b through a feeding section I, a first wedging section II and a widening section III (the core rod is not contacted with the end face of the solid round bar in the stage), then is formed into two petroleum perforating bullet shell blanks 5c with connected middle parts through a second wedging section IV and a finishing section V (the core rod is contacted with the inner hole face of the blind hole optical axis and moves in a feeding manner to form the inner hole geometric shape of the petroleum perforating bullet shell blank 5 c), and finally is finally formed into two petroleum perforating bullet shells 5d through a cutting section VI (the core rod is separated from the inner hole contact with the petroleum perforating bullet shell blank in the stage).
In a specific embodiment, the geometry of the two core rods (the first core rod 3 and the second core rod 4) is consistent with the shape of a blind hole of the petroleum perforating bullet shell 5d, and the two core rods are of a truncated cone-shaped variable diameter structure and are arranged on two axial sides of a rolled piece and used for controlling metal flow at concave center defects of the rolled piece, and can perform follow-up rotary motion around the axis X-X of the rolled piece.
In a specific embodiment, as shown in fig. 1-3, by using the cross wedge rolling process, a solid round bar 5a is placed in a space formed by a first plate type cross wedge rolling die 1, a second plate type cross wedge rolling die 2, a first core rod 3 and a second core rod 4, and is symmetrically rolled under the action of friction force by the common driving of the linear motion V1 of the first plate type cross wedge rolling die and the linear motion V2 of the second plate type cross wedge rolling die, wherein the solid round bar 5a is preformed into a blind hole optical axis 5b; the first plate type cross wedge rolling die linear motion V1, the second plate type cross wedge rolling die linear motion V2, the first core rod 3 feeding motion V3 and the second core rod 4 feeding motion V4 are driven together, symmetrically rolled under the action of friction force, and formed into two petroleum perforating bullet shell blanks 5c with middle parts connected; and finally cutting off the middle connection to finally form two petroleum perforating bullet shells 5d.
The working principle of the utility model is as follows:
as shown in fig. 1 to 7, the length L0 of the solid round bar is first determined according to the blind hole depth L1 of the petroleum perforating bullet shell, the diameter D0 of the solid round bar is calculated according to the total volume V of the petroleum perforating bullet shell 5c, symmetrically rolled cross wedge rolling dies 1, 2 are designed according to the shape of the petroleum perforating bullet shell 5c, and the sizes of the core rods 3, 4 are designed according to the blind hole shape of the petroleum perforating bullet shell 5D. The solid round bar 5a heated to the rolling temperature is transferred into a forming device consisting of two cross wedge rolling dies 1 and 2 and two core rods 3 and 4, the two cross wedge rolling dies 1 and 2 do opposite constant-speed linear motion V1 and V2, the two core rods 3 and 4 are axially fixed and rotate in a follow-up way, the geometric dimension of the inner hole of the end face of a rolled piece is precisely controlled by the two core rods 3 and 4, the geometric dimension of the outer surface of the rolled piece is precisely formed by the two cross wedge rolling dies 1 and 2, the rolled piece is preformed into a blind hole optical axis 5b, and then is wedged and rolled into two petroleum perforating bullet shell blanks 5c and a petroleum perforating bullet shell 5d for the second time.
The utility model has the technical effects that:
1. the metal of the petroleum perforating bullet shell is subjected to severe plastic deformation by adopting plate type wedge cross rolling and mandrel cooperative rolling, and the grain refinement is induced by the severe plastic deformation, so that the grain refinement of the process reaches more than 50%; the mechanical property is obviously improved, the fatigue strength is improved by more than 20 percent, and the compressive strength is improved by more than 20 percent.
2. The surface of the inner hole of the traditional cross wedge rolling hollow shaft is easy to wrinkle, and the usability of the petroleum perforating bullet shell part is affected; the process of the present utility model can significantly improve this. The inner hole wall of the traditional cross wedge rolling hollow shaft has obvious crease defects, and the inner hole wall obtained by the process has smooth and flat surface. The improvement of the folds likewise has a favourable effect on the component properties.
3. The utility model has no stub bar loss, and obviously improves the material utilization rate; compared with the traditional process for turning and forming the blind hole shaft, the material utilization rate reaches more than 90 percent.
The utility model discloses a blind hole cross wedge rolling symmetrical rolling technology which is based on double-core rod control concave core forming blind hole shell, adopts secondary wedging to realize severe plastic deformation rolling with total area reduction of more than 75%, innovatively applies a cross wedge rolling technology to the field of forming manufacturing of military missile shells, and provides blind hole cross wedge rolling symmetrical rolling technology with no weld joint, less variable rolling temperature drop and good material uniformity of rolled pieces. The rolling forming of the thin-wall blind hole part is realized by controlling the position and the movement state of the core rod in stages. The utility model has the technical characteristics of low manufacturing cost and good product performance in the field of large-scale small-specification cartridge shells, and has good industrialization prospect.
It should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered in the scope of the claims of the present utility model.
Claims (10)
1. The device is characterized by comprising two plate-type cross wedge rolling dies, two core rods, a die driving unit, a core rod driving unit and a control unit;
the two plate-type cross wedge rolling dies are provided with opposite linear motions at equal speed, are respectively arranged at two radial sides of the solid round bar stock, are used for rolling the solid round bar stock rolled piece in the rolling process to form the outline dimension of the petroleum perforating bullet shell, and are used for cutting to obtain the two petroleum perforating bullet shells;
the two core rods are provided with constant-speed opposite linear feeding motions in the axial direction and follow-up rotary motions in the circumferential direction, are respectively arranged at two axial sides of the solid round bar and are used for controlling concave defects and forming the geometric dimension of an inner hole of the oil perforating bullet shell in the rolling process;
the die driving unit is in signal connection with the two cross wedge rolling dies and is used for controlling the constant-speed opposite linear movement of the two cross wedge rolling dies;
the core rod driving unit is in signal connection with the two core rods and is used for controlling the two core rods to move in opposite directions at the same speed;
and the control unit is in signal connection with the die driving unit and the mandrel driving unit.
2. The device for roll forming of the blind hole in the cross wedge rolling of the petroleum perforating bullet shell according to claim 1, wherein the inner hole of the petroleum perforating bullet shell comprises a cylindrical inner hole section, a round table-shaped inner hole section and a spherical end surface which are sequentially connected, and the outer surface comprises a large-diameter round rod section, a round table transition section, a circular arc table section and a small-diameter round rod section which are sequentially connected.
3. The blind hole rolling forming device for cross wedge rolling of the petroleum perforating bullet shell of claim 1, wherein the two plate-type cross wedge rolling dies are rectangular thick plates with the same geometric dimension, and are provided with convex wedges which are symmetrically arranged by taking solid round bars as symmetry axes;
the plate type cross wedge rolling die is of a secondary wedging structure and sequentially comprises a feeding section, a first wedging section, a widening section, a second wedging section, a finishing section and a cutting section.
4. The petroleum perforating bullet shell cross wedge rolling blind hole rolling forming device according to claim 3, wherein the first wedging section is a triangular convex edge which is widened axially and gradually raised; the second wedging section is a trapezoid convex rib which is widened axially and gradually raised; the cutting section is a rectangular convex rib which is gradually raised and then straightened.
5. The petroleum perforating bullet shell cross wedge rolling blind hole rolling forming device according to claim 1, wherein the two core rods are variable-section core rods with the same geometric dimension; the length of the core rod is larger than the depth of the blind hole of the oil perforating bullet shell, and the shape of the core rod is consistent with the shape of the blind hole of the oil perforating bullet shell; the two core rods are symmetrically arranged at two sides of the solid round bar material in the axial direction.
6. The petroleum perforating bullet case cross-wedge rolling blind hole roll forming device of claim 1, wherein the axis of the core rod coincides with the axis of the solid round bar.
7. The petroleum perforating bullet case cross-wedge rolling blind hole rolling forming device according to claim 1, wherein the two plate-type cross-wedge rolling dies are identical in shape.
8. The petroleum perforating bullet case cross wedge rolling blind hole rolling forming device according to claim 1, wherein two plate type cross wedge rolling dies are horizontally arranged.
9. The petroleum perforating bullet case cross wedge rolling blind hole rolling forming device according to claim 1, wherein the control unit is a computer.
10. The device for rolling and forming the blind hole in the cross wedge rolling of the shell of the petroleum perforating bullet, as claimed in claim 1, wherein the solid round bar material is steel, aluminum alloy, titanium alloy or magnesium alloy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223515740.8U CN218963611U (en) | 2022-12-28 | 2022-12-28 | Petroleum perforating bullet shell wedge cross rolling blind hole rolling forming device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223515740.8U CN218963611U (en) | 2022-12-28 | 2022-12-28 | Petroleum perforating bullet shell wedge cross rolling blind hole rolling forming device |
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| CN218963611U true CN218963611U (en) | 2023-05-05 |
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