A thin-walled cylindrical part winding core mold and a method of use

Abstract

The application discloses a kind of thin-walled cylindrical part winding core mould and use method, and the steel lining of part is made of fine part with thin inner diameter and thick part with thick inner diameter, and winding core mould includes mandrel and tightener assembly sleeved outside mandrel, the mandrel includes intermediate cylinder for matching with fine part of steel lining and short cylinder corresponding with thick part of steel lining, the intermediate cylinder and short cylinder are fixedly connected, and the tightener assembly is arranged on short cylinder.Intermediate cylinder supports fine part of steel lining, prevents fine part of steel lining from deforming during winding process to cause size out-of-tolerance.Tightener assembly is tightened in thick part of steel lining, effectively supports thick part of steel lining, so that steel lining is installed on core mould, which can eliminate deformation caused by variable diameter, and effectively support between steel lining and core mould, after winding, the coaxiality and roundness of part can be guaranteed to be qualified, and the inner hole size of steel lining will not change.

Description

Technical Field

[0001] This invention relates to the field of thin-walled cylindrical parts processing technology, and in particular to a winding mandrel for thin-walled cylindrical parts and its usage method. Background Technology

[0002] The launch tube is a thin-walled cylindrical part. To simultaneously meet the design requirements of reusable firing and weight reduction for individual soldier weapon systems, the launch tube adopts a structure with a steel inner liner and a composite material reinforcement layer wound around the outer circumference. To reduce weight, the steel inner liner has a very thin wall, consisting of a thick section and a thin section. The inner wall thickness of the thin section is 0.35mm to 0.5mm, while the inner wall thickness of the thick section is 0.75mm. Due to the thinness of the steel inner liner, it needs to be installed on a mandrel for winding.

[0003] Generally speaking, if the steel liner structure is a straight cylinder without diameter change, the design of the winding mandrel is relatively simple. The gap between the mandrel and the steel liner only needs to be less than half of the inner hole tolerance zone. For example, if the inner hole is... The straight cylinder, the outer circle of the core mold is

[0004] When the steel liner has a variable diameter, the coaxiality of the two inner holes of the steel liner deviates. This deviation significantly affects the clearance fit between the mandrel and the steel liner. If the clearance between the mandrel and the steel liner is too small, the steel liner will be very tight during installation and cannot be properly installed. Forcing installation will inevitably cause bending and dimensional deformation of the steel liner before winding. If the clearance between the mandrel and the steel liner is too large, the tension during winding will inevitably cause the steel liner to fail to receive effective support and deform significantly, resulting in out-of-tolerance inner hole dimensions. Summary of the Invention

[0005] The purpose of this invention is to address the problems of difficult clamping and excessive internal hole deformation after winding in the winding process of thin-walled steel inner liner cylinders with variable diameter, and to provide a winding mandrel and method for using it.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A thin-walled cylindrical part winding mandrel is disclosed. The steel liner of the part is composed of a finer inner diameter section and a coarser inner diameter section. The mandrel includes a mandrel and a tensioning assembly sleeved on the mandrel. The mandrel includes an intermediate cylinder for engaging with the finer inner diameter section of the steel liner and a short cylinder corresponding to the coarser inner diameter section of the steel liner. The intermediate cylinder and the short cylinder are fixedly connected. The tensioning assembly is disposed on the short cylinder. The tensioning assembly includes an expansion sleeve sleeved on the short cylinder, a first cone disposed at one end of the expansion sleeve near the intermediate cylinder, and a second cone disposed at the other end of the expansion sleeve. Both the first and second cones are sleeved on the short cylinder and slide in engagement with it. The first and second cones are respectively inserted into the corresponding ends of the expansion sleeve. The mating surfaces of the first and second cones with the expansion sleeve are both conical. The expansion sleeve has a notch communicating with its end face. The end of the short cylinder away from the intermediate cylinder is provided with a pressing device for driving the second cone axially towards the intermediate cylinder.

[0008] Furthermore, a top rod is fixedly provided axially at the end of the short cylinder away from the intermediate cylinder, and the extrusion device includes a nut screwed onto the top rod, the nut abutting against the outer end of the second cone.

[0009] Furthermore, the end of the short cylinder near the middle cylinder has an outwardly protruding annular flange, and the first cone abuts against this flange.

[0010] Furthermore, the notches are several evenly distributed along the circumference of the expansion sleeve, and the notches are all aligned with the axial direction of the expansion sleeve.

[0011] Furthermore, the length of the notch is greater than 2 / 3 of the length of the expansion sleeve.

[0012] Furthermore, the notches are staggered, with two adjacent notches each connected to the opposite end of the expansion sleeve.

[0013] Furthermore, the inner end of the notch is a strip-shaped hole with an increased width, and both ends of the strip-shaped hole are arc-shaped.

[0014] Furthermore, a connecting rod is fixedly provided axially at the end of the intermediate cylinder away from the short cylinder.

[0015] Furthermore, a baffle is sandwiched between the short cylinder and the nut, and the baffle is fitted onto the top rod.

[0016] A method for using a winding mandrel for a thin-walled cylindrical part includes the following steps:

[0017] S1, insert the steel liner into the fine part of the mandrel so that the expansion sleeve corresponds to the coarse part of the steel liner;

[0018] S2, tighten the nut to move the second cone toward the middle cylinder. The expansion sleeve is squeezed by the first and second cones, and the diameter of the expansion sleeve increases, which tightens the coarse part of the steel liner.

[0019] S3 involves wrapping the outer surface of the steel lining.

[0020] The positive effects of this invention are:

[0021] This invention comprises an intermediate cylinder, a short cylinder, a first cone, an expansion sleeve, a second cone, and a nut. Tightening the nut, under the action of the first and second cones, causes the expansion sleeve to tighten the steel liner fitted onto it. The intermediate cylinder supports the finer parts of the steel liner, preventing deformation during winding and thus avoiding dimensional deviations. The expansion sleeve tightens within the coarser parts of the steel liner, effectively supporting them. This ensures that when the steel liner is installed on the mandrel, deformation caused by diameter changes is eliminated, and effective support is formed between the steel liner and the mandrel. After winding, the coaxiality and roundness of the part are guaranteed to be within acceptable limits, and the inner diameter of the steel liner remains unchanged. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the mandrel structure;

[0024] Figure 3 This is a schematic diagram of the structure of the hedging mechanism;

[0025] Figure 4 yes Figure 3 A cross-sectional view of the AA section;

[0026] Figure 5 A schematic diagram of the steel lining;

[0027] Figure 6 This is a diagram showing the usage state of the present invention;

[0028] In the picture:

[0029] 1. Connecting rod; 2. End cap; 3. Intermediate cylinder; 4. First cone; 5. Short cylinder; 6. Expansion sleeve; 7. Second cone; 8. Top rod; 9. Baffle plate; 10. Nut; 11. Strip hole; 12. Notch; 13. Steel lining. Detailed Implementation

[0030] Example 1

[0031] like Figure 5 As shown, the steel lining 5 is a cylindrical shape, tapering on the left and widening on the right. The left side is the narrower section, and the right side is the wider section. Figures 1 to 4 as well as Figure 6As shown, a thin-walled cylindrical part winding mandrel includes a mandrel and a tensioning assembly sleeved on the mandrel. The mandrel includes a connecting rod 1, a head 2, an intermediate cylinder 3, a short cylinder 5, and a push rod 8, which are fixedly connected from left to right. The connecting rod 1, head 2, intermediate cylinder 3, short cylinder 5, and push rod 8 are coaxial. When the steel liner 13 is sleeved onto the mandrel, the short cylinder 5 corresponds to the thicker part of the steel liner 13, and the tensioning assembly is disposed on the short cylinder 5.

[0032] The tensioning assembly includes a first cone 4, a tension sleeve 6, and a second cone 7 arranged sequentially from left to right. The tension sleeve 6 is made of spring steel. Both the first cone 4 and the second cone 7 are fitted onto the short cylinder 5, and both the first cone 4 and the second cone 7 are in sliding engagement with the short cylinder 5. The first cone 4 is inserted between the left end of the tension sleeve 6 and the short cylinder 5, and the second cone 7 is inserted between the right end of the tension sleeve 6 and the short cylinder 5. The mating surfaces of the first cone 4 and the tension sleeve 6, as well as the mating surfaces of the second cone 7 and the tension sleeve 6, are both conical with the larger end facing outwards.

[0033] The expansion sleeve 6 is provided with a notch 12 communicating with its end face, and the end of the short cylinder 5 away from the intermediate cylinder 3 is provided with a pressing device for driving the second cone 7 to move axially closer to the intermediate cylinder 3.

[0034] The extrusion device is a nut 10 screwed onto the top rod 8, and the nut 10 abuts against the right end of the second cone 7.

[0035] The short cylinder 5 has an outwardly protruding annular flange at one end near the middle cylinder 3, and the left side of the first cone 4 abuts against this flange.

[0036] A baffle 9 is sandwiched between the short cylinder 5 and the nut 10, and the baffle 9 is fitted onto the top rod 8. Tightening the nut 10 pushes the baffle 9 to the left, which in turn pushes the second cone 7 to the left. This causes the first cone 4 and the second cone 7 to compress the expansion sleeve 6. Under the action of the conical surfaces between the first cone 4 and the expansion sleeve 6, and between the second cone 7 and the expansion sleeve 6, the expansion sleeve 6 expands outward, its diameter increases, and it tightens the thicker part of the steel liner 13.

[0037] The outer circle of the second cone 7 is also provided with an O-ring, which, when in conjunction with the steel liner 13, can prevent the adhesive from flowing into the inner hole of the steel liner 13 during winding, thus preventing the steel liner 13 from sticking inside.

[0038] The intermediate cylinder 3 is used to support the details of the steel liner 13, preventing the details of the steel liner 13 from deforming during the winding process and causing dimensional deviations.

[0039] Example 2

[0040] The difference between this embodiment and Embodiment 1 is that:

[0041] The notches 12 are sixteen in number, evenly distributed along the circumference of the expansion sleeve 6, and all the notches 12 are aligned with the axial direction of the expansion sleeve 6.

[0042] The length of the notch 12 is 70% of the length of the expansion sleeve 6. Sixteen notches 12 are arranged alternately, and two adjacent notches 12 are connected to opposite ends of the expansion sleeve 6. The inner ends of the notches 12 are all strip holes 11 with increasing width, and both ends of the strip holes 11 are arc-shaped.

[0043] The sixteen interlaced notches 12 ensure that the force exerted on the steel liner 13 is more even when the expansion sleeve 6 tightens it, preventing deformation of the steel liner. The strip-shaped holes 11 reduce the force on the nut 10, making the expansion sleeve 6 easier to deform.

[0044] Example 3

[0045] A method for using a winding mandrel for a thin-walled cylindrical part, using a winding mandrel for a thin-walled cylindrical part as described in Example 2, includes the following steps:

[0046] S1, insert the steel liner 13 into the fine part of the mandrel so that the expansion sleeve 6 corresponds to the coarse part of the steel liner 13;

[0047] S2, tighten the nut 10 to move the second cone 7 toward the middle cylinder 3. The expansion sleeve 6 is squeezed by the first cone 4 and the second cone 7, and the diameter of the expansion sleeve 6 increases, which tightens the thick part of the steel liner 13.

[0048] S3, perform the winding operation on the outer surface of the steel lining 13.

[0049] After the mandrel is inserted into the steel liner 13, the inner hole of the thin part of the steel liner 13 matches the intermediate cylinder 3, forming a gap of about 0.03mm. Before the expansion sleeve 6 is tightened, its outer diameter is smaller than the inner diameter of the thick part of the steel liner 13, so the steel liner 13 can be easily inserted. The gaps between the first cone 4 and the short cylinder 5, the second cone 7 and the short cylinder 5, and the baffle 7 and the push rod 8 are 0.03mm to 0.07mm. After the steel liner 13 is installed, it can automatically align the first cone 4 and the second cone 7 according to the size of the coaxiality deviation. Then, tighten the nut 10 to tighten the expansion sleeve 6 within the thick part of the steel liner 13, achieving effective support for the thick part of the steel liner 13. In this way, the installation of the steel liner 13 on the mandrel can eliminate the deformation caused by the change in diameter and form effective support between the steel liner 13 and the mandrel. After winding, the coaxiality and roundness of the parts can be guaranteed to be qualified, and the inner hole size of the steel liner 13 will not change.

[0050] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present invention. They are only used to illustrate the technical ideas and features of the present invention, aiming to enable those skilled in the art to understand and implement the invention. However, they are not limited to the present invention, and the patent scope of the present invention should not be limited to these embodiments. Any equivalent changes or modifications made to the spirit disclosed in the present invention, without departing from the structure of the present invention, such as local improvements within the system and alterations or transformations between subsystems, are still within the patent scope of the present invention. Currently, the technical solution of this application has undergone pilot testing, i.e., small-scale experiments before large-scale mass production. After the pilot testing, user surveys were conducted on a small scale, and the survey results showed high user satisfaction. Preparations are now underway for the formal production and industrialization of the product, including intellectual property risk warning surveys.

Claims

1. A thin-walled cylindrical part winding mandrel, wherein the steel liner (13) of the part is composed of a finer inner diameter section and a coarser inner diameter section, characterized in that, The device includes a mandrel and a tensioning assembly fitted around the mandrel. The mandrel includes an intermediate cylinder (3) for engaging with the finer parts of a steel liner (13) and a short cylinder (5) corresponding to the coarser parts of the steel liner (13). The intermediate cylinder (3) and the short cylinder (5) are fixedly connected. The tensioning assembly is mounted on the short cylinder (5). The tensioning assembly includes a tension sleeve (6) fitted around the short cylinder (5), a first cone (4) located at one end of the tension sleeve (6) near the intermediate cylinder (3), and a second cone (7) located at the other end of the tension sleeve (6). The first cone (4) and the second cone (7) are mounted around the short cylinder (5). 7) Both are fitted onto the short cylinder (5). The first cone (4) and the second cone (7) are slidably fitted with the short cylinder (5). The first cone (4) and the second cone (7) are respectively inserted into the corresponding end of the expansion sleeve (6). The mating surfaces of the first cone (4) and the expansion sleeve (6) and the second cone (7) and the expansion sleeve (6) are both conical. The expansion sleeve (6) is provided with a notch (12) communicating with its end face. The end of the short cylinder (5) away from the intermediate cylinder (3) is provided with a pressing device for driving the second cone (7) to move axially toward the intermediate cylinder (3).

2. The thin-walled cylindrical part winding mandrel according to claim 1, characterized in that, The short cylinder (5) is fixedly provided with a top rod (8) along the axial direction at one end away from the intermediate cylinder (3). The extrusion device includes a nut (10) screwed on the top rod (8) and the nut (10) abuts against the outer end of the second cone (7).

3. A thin-walled cylindrical part winding mandrel according to claim 1, characterized in that, The short cylinder (5) has an outwardly protruding annular flange at one end near the middle cylinder (3), and the first cone (4) abuts against the flange.

4. A thin-walled cylindrical part winding mandrel according to claim 1, characterized in that, The notches (12) are several evenly distributed along the circumference of the expansion sleeve (6), and the notches (12) are all aligned with the axial direction of the expansion sleeve (6).

5. A thin-walled cylindrical part winding mandrel according to claim 4, characterized in that, The length of the notch (12) is greater than 2 / 3 of the length of the expansion sleeve (6).

6. A thin-walled cylindrical part winding mandrel according to claim 4, characterized in that, The openings (12) are staggered, and two adjacent openings (12) are respectively connected to the opposite end of the expansion sleeve (6).

7. A thin-walled cylindrical part winding mandrel according to claim 1, characterized in that, The inner end of the notch (12) is a strip hole (11) with an increased width, and both ends of the strip hole (11) are arc-shaped.

8. A thin-walled cylindrical part winding mandrel according to claim 1, characterized in that, A connecting rod (1) is fixedly installed axially at the end of the intermediate cylinder (3) away from the short cylinder (5).

9. A thin-walled cylindrical part winding mandrel according to claim 2, characterized in that, A baffle plate (9) is sandwiched between the short cylinder (5) and the nut (10), and the baffle plate (9) is sleeved on the top rod (8).

10. A method for using a winding mandrel for thin-walled cylindrical parts, characterized in that, Using a thin-walled cylindrical part winding mandrel as described in any one of claims 1 to 9, the following steps are included: S1, insert the steel liner (13) into the fine part of the core mold so that the expansion sleeve (6) corresponds to the coarse part of the steel liner (13); S2, tighten the nut (10) to move the second cone (7) toward the middle cylinder (3), the expansion sleeve (6) is squeezed by the first cone (4) and the second cone (7), the diameter of the expansion sleeve (6) increases, and the thick part of the steel liner (13) is tightened. S3, the outer surface of the steel lining (13) is wound.

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