CN112275876A - Nuclear fuel strip assembling die - Google Patents

Abstract

The invention relates to a nuclear fuel strip combination die, which comprises a die plate, wherein the die plate is provided with: at least one first clamping piece mould, a second clamping piece mould (2), a clamping piece mould formed by second groove bodies (31) which are continuously arranged, a fourth clamping piece mould (4), a clamping piece mould formed by a step platform shape, a sixth clamping piece mould (6), an eighth clamping piece mould (7) and a clamping piece mould formed by two linear grooves which are parallel at intervals. The invention can integrate a plurality of moulds with different characteristics to produce a plurality of strips.

Description

Nuclear fuel strip assembling die

Technical Field

The invention relates to a nuclear fuel strip combination die.

Background

Chinese patent application publication No. CN106825220A, published as 20170613, discloses a lattice frame strip forming system in a nuclear power plant, which comprises a correcting machine and a stamping die arranged in the left-right direction, wherein the correcting machine is arranged on a base body, the base body is also provided with a material guide roller, a detection device is arranged between the correcting machine and the stamping die, and a feeding roller is arranged at an inlet of the stamping die; limiting plates are arranged on two sides of the material guide roller; the correcting machine comprises a correcting machine shell, a high-position correcting roller and a low-position correcting roller, wherein the high-position correcting roller and the low-position correcting roller are arranged in the correcting machine shell at intervals, and adjusting discs for adjusting the height of the high-position correcting roller are arranged on the left side and the right side of the upper surface of the correcting machine shell; height sensors are arranged on two sides of the detection device along the circumferential direction of the detection device; the stamping die comprises a plurality of groups of forward stamping dies and reverse stamping dies which are arranged at intervals. A process for forming the system for forming the grid straps in a nuclear power plant is also disclosed.

Chinese patent application publication No. CN109500253A, published as 20190322, discloses a nuclear fuel assembly spacer grid outer strip punching mold, which comprises an overall shape punching mold, an outer strip end bending and chamfering mold, and a right angle bending and overlapping bending mold.

The molding process and the manufactured die have low precision and low production efficiency.

Disclosure of Invention

The invention aims to provide a fuel strip combined die which can integrate a plurality of dies with different characteristics to produce various strips.

For the combined die of the invention, the combined die comprises a die plate, and the die plate is provided with:

the first clamping part type die comprises a footing type die arranged at the end part of the first clamping part type die, and first groove bodies which are continuously arranged are distributed on the footing type die; the first clamping part mould is also provided with a first protruding strip mould positioned among the plurality of footing moulds; the end part of the first protruding belt type mould is fixedly connected with a footing type mould; a plurality of first convex section moulds are arranged on the first convex section mould at intervals;

at least one second grip pattern; the second clamping piece mould comprises first connecting belt moulds positioned at two end parts of the second clamping piece mould, and a second protruding belt mould is arranged between the two first connecting belt moulds; the first connecting belt section mould is arc-shaped and forms a groove body of a second clamping piece section mould together with the second protruding belt section mould;

at least one clamping piece section mould formed by second groove bodies which are continuously arranged;

the fourth protruding belt type die comprises two first inclined concave grooves which are arranged at intervals, and the two first inclined concave grooves which are arranged at intervals are symmetrical along the interval middle line of the first inclined concave grooves;

at least one grip pattern formed of a stepped terrace shape;

at least one sixth clamping member pattern die comprising a sixth raised strip pattern die formed by linear grooves on both sides thereof, one end of the linear groove being wider than the body thereof;

at least one eighth clamp form formed by a bracketed groove;

at least one clamping member pattern formed by two spaced parallel linear grooves.

The invention can produce various strips on one die, and can improve the production efficiency by using the combined die.

The combined die is further improved, wherein the die plate is also provided with a plurality of positioning holes, the number and the positions of the positioning holes on the die plate are the same as those of the first clamping part die, the second clamping part die and the clamping part die formed by the second groove bodies which are continuously arranged on the die plate; a fourth clamping member pattern die; a clamping member pattern die formed in a stepped terrace shape; the sixth clamping part mould and the eighth clamping part mould are formed by two linear grooves which are parallel at intervals, and the positions and the number of the clamping part moulds are adaptive.

Through the locating hole location, be favorable to the accurate location punching press of stamping workpiece, beat the convex closure, be favorable to forming the strip that the precision is high.

As a further improvement of the combined die, the first clamping piece moulds are arranged in a centralized manner and divided into areas; the second clamping piece moulds are arranged in a centralized manner and divided into areas; clamping piece moulds formed by the second grooves which are continuously arranged are arranged in a centralized manner and are divided into areas; the fourth clamping piece moulds are arranged in a concentrated mode and are divided into areas, and the clamping piece moulds formed by the stepped platform shapes are arranged in a concentrated mode and are divided into areas; the sixth clamping part moulds are arranged in a concentrated mode and are divided into areas, the eighth clamping part moulds are arranged in a concentrated mode and are divided into areas, and one clamping part mould formed by two linear grooves which are parallel at intervals is arranged in a concentrated mode and is divided into areas.

The forming dies with the same characteristics are arranged in a centralized mode, strips with the same characteristics can be conveniently punched, the strips are provided with a plurality of the same characteristics, the specification and the model can be conveniently divided, and after the zones are divided, the division of the output zone of each strip is facilitated.

The combined die is further improved, wherein the first clamping piece die, the second clamping piece die, the clamping piece die formed by the second groove bodies which are continuously arranged, the fourth clamping piece die, the clamping piece die formed by the step platform shape, the sixth clamping piece die, the eighth clamping piece die and the clamping piece die formed by two linear grooves which are parallel at intervals are arranged from the end part of the die plate to the middle part of the die plate in the sequence from large to small, wherein the gaps are large or the forming area is large.

The invention can mold many characteristics at one time, has more characteristic gaps, disperses the characteristics with larger molding area to be distributed left and right, and keeps the molding stability of the mold.

As a further improvement of the combined die, a first clamping piece die, a second clamping piece die, a clamping piece die formed by second groove bodies which are continuously arranged, a fourth clamping piece die, a clamping piece die formed by a step platform shape, a sixth clamping piece die, an eighth clamping piece die and a clamping piece die formed by two linear grooves which are parallel at intervals are intensively arranged in a mode of being arranged in rows or columns or staggered.

The method can produce the strips with the characteristics of arranging the strips in rows or in columns or in a staggered way, increase the forms and the types of the strips, and study the influence of the strips on the clamping of the fuel rods through different arrangement forms.

As a further improvement of the combined die, a first clamping piece die, a second clamping piece die, a clamping piece die formed by second groove bodies which are continuously arranged, a fourth clamping piece die, a clamping piece die formed by a step platform shape, a sixth clamping piece die, an eighth clamping piece die and a clamping piece die formed by two linear grooves which are parallel at intervals are intensively arranged in a mode that the clamping piece dies are arranged in rows or columns according to a standard.

The characteristics of the same shape on the strip are formed according to the form of large, medium and small specifications, so that the specification which has the largest influence on the clamping force of the strip can be screened conveniently.

As a further improvement of the combined die, each area is provided with positioning holes, and the positioning holes correspond to the positioning holes in each area and are identical in number.

The locating holes can also be arranged according to regions, and each locating hole is used for locating the characteristics on each region, so that the forming precision of the strip is improved.

As a further improvement of the combined die, the area is rectangular, four corners of the rectangle are rounded corners, and the number of the positioning holes is 4, and the positioning holes are distributed at the four corners of the area.

The strip with four corners being fillets is favorably formed, the positioning of the strip is facilitated through the positioning holes, the position of the characteristic on the strip is convenient to position, and the fillet position is also favorably positioned.

As a further improvement of the combined die, the positioning holes in the areas are not symmetrical along the diagonals of the areas and are also symmetrical along the bisectors of the areas.

The four positioning holes are asymmetric positioning holes, and only one fixed direction can be used for positioning, so that the punching surface and the punching direction can be effectively distinguished by the design, and the same characteristic is ensured in the same punching direction. The asymmetric positioning holes are used for positioning, the positions of the strip characteristic outer grooves on the material sheet can be guaranteed, the precision is improved, and meanwhile, the punching direction of the material can be determined without mixing.

As a further improvement of the combined die, a first clamping piece die or a second clamping piece die on the area or a clamping piece die or a fourth clamping piece die formed by second groove bodies which are continuously arranged or a clamping piece die formed by a step platform shape or a sixth clamping piece die or an eighth clamping piece die or a clamping piece die formed by two linear grooves which are parallel at intervals are intensively arranged in a half area of the area.

Material can be saved and each half area is made into a strip, thus improving the yield.

The manufacturing method of the nuclear fuel strip mold specifically comprises the following steps:

s1: feeding a long strip-shaped material, punching a plurality of positioning holes along the feeding direction, dividing the long strip-shaped material into single or a plurality of sheets according to the number and the positions of the positioning holes, wherein the number of the positioning holes on each sheet is the same, and the punching positions of the positioning holes on each sheet are the same; the positioning holes are beneficial to improving the precision, and the subsequent punching of a plurality of or single material sheets is facilitated.

S2: positioning through the positioning holes, and punching a single sheet or a plurality of sheets with the positioning holes punched;

s3: punching a strip characteristic outer groove on the punched material sheet;

s4: solid portions between the outer grooves of the features of the strip are stamped to form rigid portions that project inwardly of the web.

As a further modification of the manufacturing method of the present invention, in S2, a plurality of webs in the same row; and (3) positioning and blanking through a positioning hole by using a blanking die, firstly punching and cutting the material sheets on the two sides, and then punching and cutting the middle material sheet.

The punching die has the advantages that the stress balance during punching can be guaranteed, the quality of a material sheet is guaranteed, the punching speed can be improved to a great extent, four positioning holes can be arranged, the four positioning holes are asymmetrical, only one fixed direction can be used for positioning, the punching face and the punching direction can be effectively distinguished through the design, and the same punching direction can be guaranteed for the same characteristics. The asymmetric positioning holes are used for positioning, the positions of the strip characteristic outer grooves on the material sheet can be guaranteed, the precision is improved, and meanwhile, the punching direction of the material can be determined without mixing.

As a further improvement of the manufacturing method of the present invention, in S3, a strip-feature outer groove on the discharge sheet is punched by positioning through the positioning hole using a punching and notching die; forming a die cavity on the material sheet.

XW-42 (a high-carbon and high-chromium alloy tool steel with high wear resistance) is used as the material of all the punched main boards. And carrying out deep cooling and ultra-deep cooling treatment. The punching punch is made of tungsten steel and adopts a PG (optical grinding) processing mode, so that the processing precision and the punching strength can be improved. The number of linear cutting times is increased in the cavity with the shape like a knife edge, and the machining precision of the part is improved.

The location of the location holes can ensure the position of the strip characteristic outer groove on the material sheet, and the precision is improved.

As a further improvement of the manufacturing method of the present invention, in S4, a convex hull is formed by positioning the mold through the positioning hole and punching the portion between the cavities. In the forming process, the convex hull characteristic inevitably generates springback, and springback compensation is needed.

The stamping precision can be improved, and the required die with higher precision can be manufactured.

The nuclear fuel strip mold comprises a clamping piece mold, wherein the strip characteristic outer groove is a boundary groove of the clamping piece mold, and the clamping piece mold in the boundary groove is a rigid part protruding inwards a tablet.

The rigid portion is sufficiently rigid to not deform during manufacture of the strip to ensure accuracy of the characteristic outer groove of the strip.

As a further improvement of the nuclear fuel strip die, the clamping part type die is a first clamping part type die, the first clamping part type die comprises a footing type die positioned at the end part of the first clamping part type die, and first groove bodies which are continuously arranged are distributed on the footing type die; the first clamping part mould is also provided with a first protruding strip mould positioned among the plurality of footing moulds; the end part of the first protruding belt type mould is fixedly connected with a footing type mould; a plurality of first raised section molds are also provided at intervals on the first raised section mold. The first convex section mould reduces the contact area of the strip and the fuel rod, reduces friction force and is convenient for drawing or placing the fuel rod.

As a further improvement of the nuclear fuel strip mold of the present invention, the clamping member pattern is a second clamping member pattern; the second clamping piece mould comprises first connecting belt moulds positioned at two end parts of the second clamping piece mould, and a second protruding belt mould is arranged between the two first connecting belt moulds; the first connecting belt section mould is arc-shaped and forms a groove body of the second clamping piece section mould together with the second protruding belt section mould.

The horizontal first connecting band section mould is the arc, and when the strip shaping, the tip of the strip of being convenient for also is the arc convex part, the centre gripping fuel rod of being convenient for, two tip rigid couplings are on the strip about the first connecting band that produces has moreover, can strengthen the connection of strip and strip characteristic.

The produced strip is symmetrical and beautiful and is stressed evenly.

As a further improvement of the nuclear fuel strip mold, the clamping piece mold comprises second groove bodies which are arranged in series.

As a further improvement of the nuclear fuel strip mold, the clamping member mold is a fourth clamping member mold which comprises a fourth convex strip mold, the fourth convex strip mold comprises two first inclined concave grooves which are arranged at intervals, and the two first inclined concave grooves which are arranged at intervals are symmetrical along the interval middle line of the two first inclined concave grooves.

The stress balance in the punching process can be guaranteed, the service life of the punch is prolonged, the generated strips can obliquely clamp the fuel rod to form a slope through which wind passes, the wind pressure intensity is reduced, and the clamping effect is improved.

As a further improvement of the nuclear fuel strip mold of the present invention, the clamping member mold is stepped.

The ladder-shaped structure can improve the clamping capacity of the strips, prevent overlarge elasticity, overlarge deformation and slippage of the fuel rods when wind flows through, improve the rigidity and reduce the influence of wind pressure.

As a further improvement of the nuclear fuel strip mold of the present invention, the clamping member mold is a sixth clamping member mold including a sixth embossed band mold formed by linear grooves on both sides thereof, one end portion of the linear groove being wider than the body portion thereof. The convex bag is convenient to punch, the shearing strength is lower, and the punch forming is facilitated.

As a further improvement of the nuclear fuel strip mold of the present invention, the clamp mold is an eighth clamp mold formed by a groove of a bracket type.

The groove with the same size makes the middle part of the clamping belt wider, and increases the clamping area with the fuel rod.

As a further improvement of the nuclear fuel strip mold of the present invention, the clamping member die is formed by two spaced parallel linear grooves. The molding is simpler, the die manufacturing is simpler, and the precision is improved.

As a further improvement of the nuclear fuel strip mold, the groove in the bracket type is divided into an upper groove and a lower groove, the end part of the upper groove is close to but spaced from the end part of the lower groove, and the body part of the upper groove is parallel to the body part of the lower groove. The manufactured strip has the characteristics that the area of the characteristics on the strip contacting the fuel rod is larger, and the connection area of the characteristics on the strip and the strip is small, so that the stamping forming is facilitated.

For the manufacturing system of the present invention, it includes:

a feeder for feeding the long strip material;

a first punching machine for punching positioning holes in the long strip-like material on the feeder;

a blanking machine for punching and cutting single or multiple pieces of the long strip-shaped material through positioning holes;

a notching or second piercing press for stamping out the strip feature exterior grooves in the web or webs;

a punch that punches solid portions of the strip between the characteristic outer grooves of the strip on a single or multiple webs.

The manufacturing system can realize the die manufacturing method with higher precision, and is beneficial to improving the die production process.

The invention improves the precision of die manufacturing, the production efficiency and the scientific research efficiency of related nuclear fuel strip dies, and more strip features can be formed in a short time. The method is beneficial to evaluating the research content from the aspects of size, forming state, fracture morphology, thinning rate and the like under the condition of different process parameters, and the process parameters comprise blanking speed, lubrication mode, blank holder force and blanking clearance, and the influence of different process parameters on forming performance is contrasted.

Drawings

FIG. 1 is a schematic view of the mold shape.

Fig. 2 is a schematic illustration of processing a web on a feeder.

Figure 3 is a schematic view of the shape of a punch groove in a web.

Fig. 4 is a schematic diagram of a single-sided blanking gap.

Fig. 5 is a schematic cross-sectional view of a blanking member.

Fig. 6 is a schematic view showing an arrangement of blanking.

Reference numerals: 1. a first clamping member pattern; 11. a footing form; 12. a first tank body; 13. a first raised strip former; 14. a first convex section mold; 2. a second clamping member pattern; 21. a first connecting belt forming die; 22. a second raised strip former; 3. a third clamping member pattern die; 31. a second tank body; 32. a seventh clamping member pattern; 33. a ninth clamping member pattern die; 34. an eleventh clamping member pattern; 35. a fourteenth clamping member pattern; 36. a sixteenth clamping part pattern die; 4. a fourth clamping member pattern die; 41. a fourth raised strip former; 42. a first inclined concave groove; 5. a fifth insist die section mould; 51. a fifth raised strip former; 52. a step-shaped circular truncated cone section die; 6. a sixth clamping member pattern die; 61. a sixth raised strip former; 62. two line grooves; 7. an eighth clamping member pattern die; 71. a thirteenth clamping member pattern die; 72. a fifteenth clamping member pattern die; 8. a tenth clamping member pattern die; 81. a twelfth clamping member pattern die; 9. a seventeenth clamping member pattern die; 91. an eighteenth clamping part pattern die; 92. and a nineteenth clamping piece type die.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention adopts a manufacturing method of a nuclear fuel strip mold, which comprises the following steps:

s1: feeding a long strip-shaped material, punching a plurality of positioning holes along the feeding direction, and dividing the long strip-shaped material into a plurality of material sheets according to the number and the positions of the positioning holes; each row is provided with 3 material sheets, the number of the positioning holes in each material sheet is the same, and is 4, the punching positions of the positioning holes in each material sheet are the same, and the positioning holes are arranged at the four corners of the material sheet; the positioning holes are beneficial to improving the precision, and the subsequent punching of a plurality of or single material sheets is facilitated.

S2: positioning through the positioning holes, and punching a plurality of material sheets with the positioning holes punched under the material sheets;

s3: punching a strip characteristic outer groove on the punched material sheet;

s4: solid portions between the outer grooves of the features of the strip are stamped to form rigid portions that project inwardly of the web.

In this example, in S2, 3 webs in the same row; and (3) positioning and blanking through a positioning hole by using a blanking die, firstly punching and cutting the material sheets on the two sides, and then punching and cutting the middle material sheet.

The punching die has the advantages that the stress balance during punching can be guaranteed, the quality of a material sheet is guaranteed, the punching speed can be improved to a great extent, four positioning holes can be arranged, the four positioning holes are asymmetrical, only one fixed direction can be used for positioning, the punching face and the punching direction can be effectively distinguished through the design, and the same punching direction can be guaranteed for the same characteristics. The asymmetric positioning holes are used for positioning, the positions of the strip characteristic outer grooves on the material sheet can be guaranteed, the precision is improved, and meanwhile, the punching direction of the material can be determined without mixing.

In the present embodiment, in S3, the strip-feature outer grooves on the sheet are punched out by positioning through the positioning holes using a punching-and-notching die; forming a die cavity on the material sheet.

XW-42 (a high-carbon and high-chromium alloy tool steel with high wear resistance) is used as the material of all the punched main boards. And carrying out deep cooling and ultra-deep cooling treatment. The punching punch is made of tungsten steel and adopts a PG (optical grinding) processing mode, so that the processing precision and the punching strength can be improved. The number of linear cutting times is increased in the cavity with the shape like a knife edge, and the machining precision of the part is improved.

In this embodiment, in S4, the forming die is used to position the mold via the positioning hole, and the portion between the cavities is punched, so that the mold is just formed into a convex shape, i.e., a convex hull is formed. In the forming process, the convex hull characteristic inevitably generates springback, and springback compensation is needed.

Example 2

The invention adopts the manufacturing method to manufacture the corresponding nuclear fuel strip die, which comprises a clamping piece die, wherein the characteristic outer groove of the strip punched in the manufacturing method is a boundary groove of the clamping piece die, and the clamping piece die in the boundary groove is a rigid part protruding towards the interior of the material sheet.

The rigid portion is sufficiently rigid to not deform during manufacture of the strip to ensure accuracy of the characteristic outer groove of the strip.

In fig. 1, the clamping part mold of the present embodiment may be a first clamping part mold 1, the first clamping part mold 1 includes a footing mold 11 located at an end portion thereof, and first groove bodies 12 arranged in series are distributed on the footing mold 11; the first clamping member mould 1 also has a first raised strip mould 13 between the 4 footing moulds 11; the end part of the first protruding strip mold 13 is fixedly connected with the footing mold 11; on the first raised strip mould 13 there are also 2 first raised moulds 14 at intervals.

The first convex section mould reduces the contact area of the strip and the fuel rod, reduces friction force and is convenient for drawing or placing the fuel rod.

In fig. 1, the grip pattern mold of the present embodiment may be a second grip pattern mold 2; the second clamping piece mould 2 comprises first connecting belt moulds 21 positioned at two end parts of the second clamping piece mould, and a second protruding belt mould 22 is arranged between the two first connecting belt moulds 21; the first connecting belt die 21 is arc-shaped and forms a groove body of the second clamping piece die 2 together with the second protruding belt die 22.

The transverse first connecting belt forming die 21 is arc-shaped, when the strip is formed, the end part of the strip is also arc-shaped convex part, so that the fuel rod can be clamped conveniently, and the generated first connecting belt has a left end part and a right end part which are fixedly connected on the strip, so that the connection of the strip and the strip characteristic can be enhanced.

In fig. 1, the grip pattern mold of the present embodiment includes second groove bodies 31 arranged in series. The second groove bodies 31 arranged in series can form characteristic grooves with various shapes, and the characteristics of the multiple groove bodies are utilized to enable the characteristics on the generated strips to have multiple gaps, so that the fuel rods can be clamped to ventilate, the wind pressure is reduced, and the clamping effect is ensured.

In fig. 1, the clamping member pattern of the present embodiment may be a fourth clamping member pattern 4, which includes a fourth convex strip pattern 41, and the fourth convex strip pattern 41 includes two first inclined concave grooves 42 arranged at intervals, and the two first inclined concave grooves 42 arranged at intervals are symmetrical along a separation middle line between the two first inclined concave grooves 42.

The stress balance in the punching process can be guaranteed, the service life of the punch is prolonged, the generated strips can obliquely clamp the fuel rod to form a slope through which wind passes, the wind pressure intensity is reduced, and the clamping effect is improved.

In fig. 1, the grip pattern of the present embodiment has a stepped shape. The ladder-shaped structure can improve the clamping capacity of the strips, prevent overlarge elasticity, overlarge deformation and slippage of the fuel rods when wind flows through, improve the rigidity and reduce the influence of wind pressure.

In fig. 1, the clamping member mold of the present embodiment may be a sixth clamping member mold 6 including a sixth convex band mold 61, the sixth convex band mold 61 being formed with line-shaped grooves 62 at both sides thereof, and one end of the line-shaped groove 62 being wider than the body thereof. The convex bag is convenient to punch, the shearing strength is lower, and the punch forming is facilitated.

In fig. 1, the grip pattern of the present embodiment may be an eighth grip pattern 7 formed of a groove of a bracket type. The groove with the same size makes the middle part of the clamping belt wider, and increases the clamping area with the fuel rod.

In fig. 1, the present embodiment of the clamp pattern is formed by two spaced parallel linear grooves. The molding is simpler, the die manufacturing is simpler, and the precision is improved.

In fig. 1, the bracket-shaped groove of the present embodiment may be divided into an upper groove and a lower groove, the end of the upper groove and the end of the lower groove are close to but spaced apart from each other, and the body of the upper groove is parallel to the body of the lower groove. The manufactured strip has the characteristics that the area of the characteristics on the strip contacting the fuel rod is larger, and the connection area of the characteristics on the strip and the strip is small, so that the stamping forming is facilitated.

Example 3

The invention adopts the plurality of nuclear fuel strip molds to manufacture the combined mold, which comprises a template, wherein the template is provided with:

the first clamping part type die 1 comprises a footing type die 11 positioned at the end part of the first clamping part type die 1, and first groove bodies 12 which are continuously arranged are distributed on the footing type die 11; the first clamping member mould 1 also has a first raised strip mould 13 between the 4 footing moulds 11; the end part of the first protruding strip mold 13 is fixedly connected with the footing mold 11; the first convex strip mold 13 is also provided with 2 first convex section molds 14 at intervals;

a second clamping member pattern 2; the second clamping piece mould 2 comprises first connecting belt moulds 21 positioned at two end parts of the second clamping piece mould, and a second protruding belt mould 22 is arranged between the two first connecting belt moulds 21; the first connecting belt die 21 is arc-shaped and forms a groove body of the second clamping piece die 2 together with the second protruding belt die 22;

a holding member pattern formed by the second groove bodies 31 arranged in series;

a fourth clamping member pattern die 4, which comprises a fourth convex strip pattern die 41, wherein the fourth convex strip pattern die 41 comprises two first inclined concave grooves 42 which are arranged at intervals, and the two first inclined concave grooves 42 which are arranged at intervals are symmetrical along the interval middle line of the two first inclined concave grooves 42;

a holding member pattern formed in a stepped terrace shape;

a sixth clamping member pattern die 6 including a sixth raised strip pattern die 61, the sixth raised strip pattern die 61 being formed with linear grooves 62 on both sides thereof, the linear grooves 62 being wider at one end than at the body;

an eighth clamp pattern 7 formed by a groove of a bracket type;

a clamping member pattern formed by two spaced parallel linear grooves.

The invention can produce various strips on one die, and can improve the production efficiency by using the combined die. The invention can mold many characteristics at one time, has more characteristic gaps, disperses the characteristics with larger molding area to be distributed left and right, and keeps the molding stability of the mold.

Example 4

In order to realize the manufacturing method, the invention adopts the following manufacturing system, comprising:

a feeder for feeding the long strip material;

a first punching machine for punching positioning holes in the long strip-like material on the feeder;

a blanking machine for punching and cutting single or multiple pieces of the long strip-shaped material through positioning holes;

a notching or second piercing press for stamping out the strip feature exterior grooves in the web or webs;

a punch that punches solid portions of the strip between the characteristic outer grooves of the strip on a single or multiple webs.

The manufacturing system can realize the die manufacturing method with higher precision, and is beneficial to improving the die production process.

Example 5

Fig. 1 shows a first forming die for forming a first strip for holding a fuel rod, a first clamping member on the first strip being formed by stamping a first clamping member die 1 on the first forming die in cooperation with a stamping device;

the first clamping part mould 1 comprises a footing mould 11 for forming four footing of a first clamping part which is fixedly connected on a first strip in a reinforcing way, the four footing moulds 11 are positioned at two sides of the upper end and two sides of the lower end of the first clamping part mould 1, first groove bodies 12 which are continuously arranged are distributed on the four footing moulds 11, and the first clamping part mould 1 further comprises a first convex strip mould 13 for forming a first convex strip on the first strip for realizing the clamping function; both sides of the upper end and the lower end of the first convex strip-shaped mould 13 are fixedly connected with a footing-shaped mould 11, and the first convex strip-shaped mould 13 is also provided with two first convex section moulds 14 which are spaced up and down; after punching, two small convex parts are formed on the first convex belt. The first clamping member mould 1 and the footing mould 11, the first protruding strip mould 13 and the first protruding section mould 14 thereon are all formed by a first groove on the first template, which is recessed in the first template, and the first groove takes the shape of a first strip. The first clamping piece section mould 1 is formed into a straight spring, and a corresponding straight spring punching groove is formed in the first forming mould.

Fig. 1 also shows a second forming die comprising a second grip pattern die 2 for forming a second grip on a second strip; the second clamping part pattern die 2 comprises a first connecting belt pattern die 21 for forming a first connecting belt at the upper end and the lower end of a second protruding belt on the second strip, the first connecting belt and the second protruding belt are connected into a whole, the corresponding first connecting belt pattern die 21 and the second protruding belt pattern die 22 are also connected into a whole, the first connecting belt is an arc-shaped belt, and two ends of the first connecting belt are fixedly connected onto the second strip. The corresponding first connecting belt molds 21 are also arc-shaped and are distributed at the upper and lower ends of the second projecting belt mold 22. The second clamping member mould 2 and the first connecting strip mould 21 and the second projecting strip mould 22 thereon are both formed by a second groove in the second template, which groove is recessed in the second template, which second groove is present in the form of a second strip. The second clamping member mould 2 is also shaped as a straight spring, and the second shaping mould is provided with a corresponding straight spring punching groove.

Fig. 1 also shows a third forming die comprising a third mould section 3 for forming a third clamping member on a third strip, the third mould section 3 comprising a second channel 31 mould arranged continuously inclined for forming a third raised strip on the third strip, the third raised strip having a second channel section mould arranged continuously inclined, the third mould section 3 and the second channel 31 mould thereon both being formed by a third groove on the third mould plate recessed in the third mould plate, the third groove being in the shape of the third strip. The third clamping piece section die 3 forms an inclined spring, and a corresponding inclined spring punching groove is formed in the third forming die.

Fig. 1 shows a fourth forming die, which includes a fourth clamping member die 4 for forming a fourth clamping member on a fourth strip, which includes a fourth convex strip die 41 for forming a fourth convex strip, where the fourth convex strip die 41 is used for forming a fourth convex strip of an obliquely placed parallelogram, the fourth convex strip is connected to the fourth strip at two ends, the fourth convex strip die 41 is two first oblique concave grooves 42 arranged at intervals, the fourth convex strip is formed by punching at intervals, and the two first oblique concave grooves 42 arranged at intervals are symmetrical along a middle line of the interval between the two first oblique concave grooves 42. The fourth gripping member mould 4 and the fourth projecting strip mould 41 thereon are formed by a fourth groove in the fourth template, which fourth groove assumes the shape of a fourth strip. The fourth clamping piece section die 4 forms an inclined spring, and a corresponding inclined spring punching groove is formed in the fourth forming die.

Fig. 1 shows a fifth forming die comprising a fifth solid pattern die 5 for forming a fifth clamping member on a fifth strip, comprising a fifth raised strip die 51 for forming a fifth raised strip, which is stepped, truncated-cone-shaped, produced by a matching stamping device with a stepped truncated-cone die 52 corresponding to the stepped truncated-cone-shaped, the fifth clamping member die 5 and the fifth raised strip die 51 thereon both being formed by a fifth recess on a fifth template, which is in the shape of a fifth strip. The fifth insisting part mould 5 forms a round convex hull.

Fig. 1 shows a sixth molding die including a sixth clamping member die 6 for molding a sixth clamping member on a sixth strip, which includes a sixth projecting strip die 61 for molding a sixth projecting strip, the sixth projecting strip die 61 being formed with linear grooves 62 on both sides thereof, the lower ends of the linear grooves 62 being wider than the upper portions thereof, whereby the sixth projecting strip is formed, and the root portion of the sixth projecting strip formed between the two linear grooves 62 being slightly narrower than the body portion of the sixth projecting strip formed between the upper portions of the two linear grooves 62. And the sixth forming die is provided with a corresponding long punching groove.

Fig. 1 shows a seventh forming die, which includes a seventh clamping member pattern 32 for forming a seventh clamping member on a seventh strip, the seventh clamping member pattern 32 is formed by second groove bodies 31 which are continuously arranged like the third clamping member pattern 3, the second groove bodies 31 are horizontally arranged, and the second groove bodies 31 on both sides of the seventh clamping member pattern 32 are longer and longer when continuously formed toward the middle, and are formed into a square or rectangle with rounded corners, so that the seventh protruding strip is formed. The seventh clamping member pattern 32 forms a spring rigid projection.

Fig. 1 shows an eighth forming die comprising an eighth grip pattern 7 for forming an eighth grip on an eighth strip, which eighth grip pattern 7 is formed by a groove of a bracket type, the middle of which bracket type produces an eighth projecting strip on the eighth strip. And the eighth forming die is provided with a corresponding spring rigid convex stamping groove.

Fig. 1 shows a ninth forming die comprising a ninth grip pattern 33 for forming ninth grips on a ninth strip, which ninth grip pattern 33 is formed by a second channel 31 arranged in series like the third grip pattern 3, which second channel 31 is arranged horizontally, with constant length, creating a rectangular ninth raised strip. The ninth clamping member pattern die 33 is formed to be rigid.

Fig. 1 shows a tenth forming die comprising a tenth mould 8 for forming a tenth clamping member on a tenth strip, which tenth mould 8 is formed by two parallel, rectilinear spaced grooves, which spacing produces a tenth projecting strip on the tenth strip. The tenth forming die is provided with a corresponding rigid convex stamping groove.

Fig. 1 shows an eleventh forming die comprising an eleventh clamping member pattern 34 for forming an eleventh clamping member on an eleventh strip, which eleventh clamping member pattern 34 is formed by a second groove 31 arranged consecutively like the third clamping member pattern 3 and is arranged more closely, resulting in a tighter eleventh projecting strip. The eleventh clamping member pattern 34 is shaped as a rigid projection.

Fig. 1 shows a twelfth forming die comprising a twelfth grip mould 81 for forming a twelfth grip on a twelfth strip, which twelfth grip mould 81 is formed like the tenth grip mould by two parallel spaced linear grooves, but of shorter length and produces a twelfth raised strip of shorter length. The twelfth forming die is provided with a corresponding rigid convex punching groove

Fig. 1 shows a thirteenth forming die including a thirteenth grip pattern 71 for forming a thirteenth grip on a thirteenth strip, which is formed by a channel of a bracket type like the eighth grip pattern 7, the channel being divided into an upper channel and a lower channel, an end of the upper channel and an end of the lower channel being close to but spaced apart from each other, and a thirteenth projection band being formed between the upper channel and the lower channel, the thirteenth projection band also being narrower on both sides due to the close proximity of the ends of the upper channel and the lower channel. The thirteenth forming die comprises three rows of thirteenth clamping part molds 71, wherein the sizes of the rows are gradually increased from upper row to lower row. The thirteenth forming die has a corresponding rigid convex stamping groove.

Fig. 1 shows a fourteenth molding die including a fourteenth clamping member pattern 35 for molding a fourteenth clamping member on a fourteenth strip, the fourteenth clamping member pattern 35 being formed by second groove bodies 31 arranged in series like the third clamping member pattern 3, the second groove bodies 31 at both ends of the fourteenth clamping member pattern 35 being shorter to form both ends of the fourteenth clamping member pattern 35, and the fourteenth strip thus formed also having groove-shaped ends. The fourteenth forming mold includes three rows of fourteenth clamping member molds 35, and the sizes of the fourteenth clamping member molds are gradually increased from the upper row to the lower row, so that the sizes of the fourteenth protruded belt on the fourteenth strip are gradually increased from the upper row to the lower row. The fourteenth clamping member pattern 35 is formed as a rigid projection

Fig. 1 shows a fifteenth forming die including a fifteenth clamp pattern 72 for forming a fifteenth clamp on a fifteenth strip, which is a thirteenth clamp pattern of the thirteenth forming die intermediate row size, so that a fifteenth projection band on the fifteenth strip is formed as a thirteenth projection band of the thirteenth strip intermediate row size.

Fig. 1 shows a sixteenth forming die including a sixteenth clamping member pattern die 36 for forming a sixteenth clamping member on a sixteenth strip, which is a fourteenth clamping member pattern die of a fourteenth forming die middle row size, and a sixteenth projection strip size is a fourteenth projection strip size of a middle row. The sixteenth clamp section mold 36 is formed to be rigid.

Fig. 1 shows a seventeenth forming die including a seventeenth gripper pattern 9 for forming a seventeenth gripper on a seventeenth strip, which is formed with a recess of an elliptical stepped terrace shape, so that the seventeenth strip is formed with a seventeenth projecting strip of an elliptical stepped terrace shape. The seventeenth clamping piece type die 9 forms a small-size waist-shaped convex hull.

Fig. 1 shows an eighteenth molding die including an eighteenth clamping member die 91 for molding an eighteenth clamping member on an eighteenth strip, which is an oval stepped-platform-shaped groove like the seventeenth clamping member die 9, and which can be made into an oval stepped-platform-shaped eighteenth projected strip, but which is larger in size than the seventeenth projected strip made by the seventeenth clamping member die 9. The eighteenth clamping member pattern die 91 forms a medium-sized oval convex hull.

Fig. 1 shows a nineteenth molding die including a nineteenth grip die 92 for molding a nineteenth grip on a nineteenth strip, which is an elliptical stepped terrace-shaped recess like the seventeenth grip die 9, and which can be made into a nineteenth projected band of an elliptical stepped terrace shape, but is larger in size than the eighteenth projected band made by the eighteenth grip die 91. The nineteenth grip pattern 92 forms a large-sized oval convex hull.

Example 6

The forming die is made of zirconium material, the width of the material is 240mm, and the zirconium material is rare precious metal, so that the utilization rate of the material is required to be maximized, and the waste of the material is reduced.

The invention adopts the blanking die to punch the shape of the die; long grooves on the punching die of the punching and notching die and the like; and forming the product by a forming die to form the rigid convex and other characteristics.

In fig. 2, the blanking die needs to punch out a square sheet required for a die for subsequent forming and four positioning holes located at four corners of the square sheet.

Arranging the required characteristics of the die product on a square material sheet with the length of 105 times the width of 75;

first, a long strip of material 240 is provided, and in order to maximize the material utilization, three sheets can be die cut in each row in the width direction, the feeding step pitch 108, so that the material utilization can reach 92%.

The blanking process is as follows: the two materials are symmetrically positioned from left to right (as indicated by arrows in the figure), three materials are punched or blanked at different times in order to keep stress balance, then the position punched with the positioning hole in the previous step is blanked, the positioning hole punching is carried out on the middle part of the same row of materials, and finally the blanking is carried out on the middle part, and the steps are carried out in a circulating manner.

Explaining the stress balance, the pressure of the punch press on the die is constant, the acting surface is the upper surface of the whole die, if the stress is only on one end of the acting surface, the stress on the whole die is not uniform, and the shearing force on the side is possibly insufficient to enable the material to be fully punched, so that incomplete blanking or punching is generated.

In fig. 3, the present invention uses a punching and notching die to punch out the elongated slot and the desired profile of each rigid male mold. Arranging the required characteristics on the material sheets punched by the blanking die in sequence, and positioning and punching through the round holes at four corners of each material sheet.

The 8 webs may be die cut together or may be die cut separately from a single web. The lower half part with the blank on the material sheet can also be turned around to punch other characteristics, so that the waste of materials is well avoided, and the utilization rate of the materials is improved.

8 material sheet punching cavities are prepared for subsequent rigid convex forming. The punching clearance is 0.03mm on one side.

In fig. 4, to verify the material properties, the 8 elongated edges of the long-channel formed web were at different gaps.

In fig. 5, the present invention uses the feature of forming the mold to form each rigid protrusion and spring.

And respectively positioning the material sheets punched by the punching and notching die at the positions corresponding to the forming positions through the round holes at the four corners of each material sheet to carry out rigid convex forming.

The 8 webs may be die cut together or may be die cut separately from a single web. The effect of different forming gaps on material formation needs to be verified separately for each feature formation.

The invention improves the production efficiency and the scientific research efficiency, more strip characteristics are formed in a short time, and the die integrates various forming characteristics to be researched in the strip, so that more characteristics can be formed by one-time blanking. The method is beneficial to evaluating the research content from the aspects of size, forming state, fracture morphology, thinning rate and the like under the condition of different process parameters, and the process parameters comprise blanking speed, lubrication mode, blank holder force and blanking clearance, and the influence of different process parameters on forming performance is contrasted.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.

Claims (10)

1. A nuclear fuel strip assembly mold comprising a mold plate, wherein the mold plate has arranged thereon:

the die comprises at least one first clamping piece die (1), wherein the first clamping piece die (1) comprises a footing die (11) positioned at the end part of the first clamping piece die, and first groove bodies (12) which are continuously arranged are distributed on the footing die (11); the first clamping member mould (1) further has a first raised strip mould (13) located between the plurality of footing moulds (11); the end part of the first protruding belt-shaped mould (13) is fixedly connected with a footing mould (11); a plurality of first convex section moulds (14) are arranged on the first convex section mould (13) at intervals;

at least one second grip pattern (2); the second clamping piece mould (2) comprises first connecting belt moulds (21) positioned at two end parts of the second clamping piece mould, and a second protruding belt mould (22) is arranged between the two first connecting belt moulds (21); the first connecting belt die (21) is arc-shaped and forms a groove body of the second clamping piece die (2) together with the second protruding belt die (22);

at least one clamping member pattern formed by second groove bodies (31) which are arranged in series;

at least one fourth clamping part mould (4) which comprises a fourth convex strip mould (41), wherein the fourth convex strip mould (41) comprises two first inclined concave grooves (42) which are arranged at intervals, and the two first inclined concave grooves (42) which are arranged at intervals are symmetrical along the interval middle line of the two first inclined concave grooves;

at least one grip pattern formed of a stepped terrace shape;

at least one sixth clamping member pattern die (6) including a sixth raised strip pattern die (61), the sixth raised strip pattern die (61) being formed with linear grooves (62) on both sides thereof, one end of the linear groove (62) being wider than the body thereof;

at least one eighth clamp profile (7) formed by a channel of the bracketed type;

at least one clamping member pattern formed by two spaced parallel linear grooves.

2. The nuclear fuel strip combination die as claimed in claim 1, wherein the die plate further has a plurality of positioning holes, the number and position of which on the die plate, and the first clamping member pattern (1), the second clamping member pattern (2) and the clamping member pattern formed by the second groove bodies (31) arranged in series on the die plate; a fourth clamping member pattern (4); a clamping member pattern die formed in a stepped terrace shape; the sixth clamping part mould (6) and the eighth clamping part mould (7) are formed by two linear grooves which are parallel at intervals, and the positions and the number of the clamping part moulds are matched.

3. A nuclear fuel strip assembly mold as claimed in claim 1, wherein said first clamping member pattern mold (1) is arranged in a concentrated manner and divided into regions; the second clamping piece moulds (2) are arranged in a centralized manner and are divided into areas; the clamping piece moulds formed by the second grooves (31) which are continuously arranged are arranged in a centralized way and are divided into areas; the fourth clamping piece moulds (4) are arranged in a concentrated manner and are divided into areas, and the clamping piece moulds formed by the stepped platform shapes are arranged in a concentrated manner and are divided into areas; the sixth clamping member moulds (6) are arranged in a concentrated manner and are divided into areas, the eighth clamping member moulds (7) are arranged in a concentrated manner and are divided into areas, and one clamping member mould formed by two linear grooves which are parallel at intervals is arranged in a concentrated manner and is divided into areas.

4. The nuclear fuel strip combination die as claimed in claim 1, wherein the first clamping member die (1), the second clamping member die (2), the clamping member die formed by the second groove bodies (31) arranged in series, the fourth clamping member die (4), the clamping member die formed by the step platform shape, the sixth clamping member die (6), the eighth clamping member die (7), and the clamping member die formed by the two linear grooves parallel to each other at intervals are arranged from the end part of the die plate to the middle part of the die plate in the order from large to small, wherein the gaps are large or the molding area is large.

5. A nuclear fuel strip assembly mould as claimed in claim 3, wherein the first clamping means mould (1), the second clamping means mould (2), the clamping means mould formed by the second channel (31) arranged in series, the fourth clamping means mould (4), the clamping means mould formed by the stepped platform shape, the sixth clamping means mould (6), the eighth clamping means mould (7), the clamping means mould formed by the two spaced parallel linear grooves are arranged in a concentrated manner in rows or in columns or in a staggered manner.

6. A nuclear fuel strip assembly mould as claimed in claim 3, in which the first (1) and second (2) clamping means moulds, the clamping means mould formed by the second channel (31) in series, the fourth (4) clamping means mould, the clamping means mould formed by the stepped configuration, the sixth (6) and eighth (7) clamping means moulds, the clamping means moulds formed by the two spaced parallel linear channels are arranged together in a sub-scale row or column arrangement.

7. A nuclear fuel strip assembly mold according to claim 3, wherein each of the plurality of zones is provided with a corresponding number of locating holes.

8. The nuclear fuel strip assembling die as claimed in claim 7, wherein said area has a rectangular shape with four corners rounded, and said number of said positioning holes is 4, and is distributed at the four corners of the area.

9. The nuclear fuel strip assembly mold of claim 8, wherein the locating holes in the zones are neither symmetric along a zone diagonal nor symmetric along a zone bisector.

10. A nuclear fuel strip assembling die as claimed in claim 9, wherein the first clamping member pattern (1) or the second clamping member pattern (2) or the clamping member pattern formed by the second grooves (31) arranged in series or the fourth clamping member pattern (4) or the clamping member pattern formed by the step-shaped step.

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