Single-pole-hole combustion chamber shell winding tooling

Abstract

The present invention relates to the field of composite material casings for solid rocket motors, and particularly to a winding tooling for a single-pole hole combustion chamber casing. It includes: a winding mandrel, a clamping disc, a conical cap, a snap fastener, a nut, and a sand core mold with a metal joint. The winding mandrel forms a shoulder through a diameter change, and a conical cap, a snap fastener, and a nut are installed at the thin-diameter shaft head to achieve axial positioning; for the conical cap, the inner hole is matched with the winding mandrel, and the outer square is matched with the inner hole of the sand core mold; for the snap fastener, the outer side is matched with the square inner hole of the conical cap, and the inner hole is matched with the outer side of the nut; for the nut, it is connected to the thin shaft of the winding mandrel through a thread; the clamping disc axially moves along the thread of the winding mandrel on the winding side and fits with the metal joint; the inner hole of the sand core mold is matched with the size of the winding mandrel, and is connected to the metal joint on the winding side, and has an opening on the other side for facilitating the installation of the conical cap, snap fastener, and nut. The present invention enables each part not to rotate independently in the circumferential direction, realizing the circumferential fixation of the sand core mold and the winding mandrel.

Description

Technical Field

[0001] The present invention relates to the field of composite material casings for solid rocket motors, and more particularly to a winding tooling for a single-pole-hole combustion chamber casing. Background Art

[0002] For single-pole-hole containers such as liquid hydrogen storage tanks and gas cylinders, the inner liner and the joint are integrated and are placed inside the winding casing. During winding, only a winding mandrel needs to be installed on the joint, and there is no problem of inner liner demolding.

[0003] Before winding the composite material casing of the single-pole-hole solid rocket motor combustion chamber, the core mold also contains a metal joint. However, the metal joint and the core mold (such as a sand core mold and a skeleton core mold) are not an integrated structure and cannot transmit the rolling torque. The mandrel must pass through the middle hole of the joint and the core mold to support and position the joint and the core mold. Therefore, the core mold and mandrel design methods of single-pole-hole containers such as liquid hydrogen storage tanks and gas cylinders cannot be used.

[0004] The winding core mold of the single-pole-hole combustion chamber casing needs to realize the cooperation and fixation between the winding mandrel and the sand core mold during winding, and also needs to realize the unlocking and separation between the winding mandrel and the sand core mold during demolding. Since one end of the single-pole-hole combustion chamber casing is open and the other end is closed, it is impossible to operate from the closed end during demolding, and only the winding mandrel on the open side can be used, which has certain technical difficulties. Summary of the Invention

[0005] Technical Problems to be Solved by the Invention

[0006] The present invention provides a winding tooling for a single-pole-hole combustion chamber casing to realize the assembly of the mandrel and the sand core mold. Through the shoulder and cone cap formed by the diameter change of the mandrel, the sand core is clamped and fixed, so that the winding mandrel and the sand core mold become an integral body and are continuously clamped during winding; at the same time, the reverse design of the tightening direction of the nut and the rolling direction of the core mold realizes the locking and unlocking of the mandrel and the nut, and thus realizes smooth demolding;

[0007] Technical Solutions Adopted

[0008] The winding tooling for a single-pole-hole combustion chamber casing includes:

[0009] A winding mandrel, the winding mandrel forms a shoulder through diameter change, and a cone cap, a buckle and a nut are installed at the shaft head of the thin diameter to realize axial positioning;

[0010] A cone cap, the inner hole of the cone cap is matched with the winding mandrel, and the outer side is matched with the inner hole of the sand core mold;

[0011] A buckle, the outer ring of the buckle is matched with the inner hole of the cone cap, the inner hole is matched with the outer ring of the nut, and the nut is connected to the thin shaft of the winding mandrel through a thread;

[0012] The clamping disc moves axially along the winding mandrel thread on the winding side and fits with the metal joint, thereby fastening the core mold.

[0013] The inner hole of the core mold matches the size of the winding mandrel and is connected to the metal joint on the winding side. The other side is open to facilitate the installation of the cone cap snap nut.

[0014] Further, the outer ring of the cone cap can be quadrilateral, pentagonal or hexagonal.

[0015] Further, the inner hole of the cone cap can be quadrilateral, pentagonal or hexagonal.

[0016] Further, the winding mandrel is disengaged from the nut by reverse torque.

[0017] Further, the maximum diameter of the winding mandrel is the same as the outer diameter of the cone cap.

[0018] Beneficial effects

[0019] When winding with this tooling, each part cannot rotate independently circumferentially, achieving the circumferential fixation of the core mold and the winding mandrel; the tightening direction of the nut thread is opposite to the rolling direction of the core shaft during winding, making the nut tighter and tighter during winding. Combining with the change in the diameter of the winding mandrel, the axial limit of the core mold and the winding mandrel is realized, achieving the axial fixation of the core mold and the winding mandrel. Description of the drawings

[0020] Figure 1 : Schematic diagram of the winding tooling for the single-pole hole combustion chamber shell;

[0021] Figure 2 : Schematic diagram of the core mold:

[0022] Figure 3 : Schematic diagram of the winding mandrel;

[0023] Figure 4 : Schematic diagram of the cone cap;

[0024] Figure 5 : Schematic diagram of the snap;

[0025] Figure 6 : Schematic diagram of the clamping disc;

[0026] Among them: 1. Winding mandrel, 2. Clamping disc, 3. Cone cap, 4. Snap, 5. Nut, 6. Core mold. Specific implementation method

[0027] The main idea of the winding core mold of the present invention is that the winding mandrel forms shoulders through diameter changes. A cone cap and a nut are installed at the thin-diameter shaft head. Axial limit is achieved through the shoulders, blocking, and the nut. The blocking adopts a polygonal structure, and the inner hole of the sand core mold also adopts a polygonal structure. The two cooperate to achieve circumferential positioning. The nut and the blocking are fixed by setting an intermediate transition part, the snap. Then, through the reverse design of the tightening direction of the nut and the winding direction, the nut will be tightened more and more tightly with the mandrel during winding. The above method can fix and lock the sand core mold, blocking, nut, and mandrel to each other. During demolding, only need to rotate the winding mandrel in the reverse direction to loosen the nut, and then pull out the mandrel to achieve smooth demolding.

[0028] The invention will be further described below in conjunction with the drawings and specific embodiments:

[0029] The winding tooling for the single-pole hole combustion chamber shell is as Figure 1 shown:

[0030] The winding tooling for the single-pole hole combustion chamber shell includes: winding tooling 1, clamping disc 2, cone cap 3, snap 4, nut 5, and sand core mold 6.

[0031] The sand core mold and the metal joint are installed on the winding tooling. One end of the winding tooling is the clamping end of the winding machine. The sand core mold is wrapped with an insulating layer and wound with a carbon fiber layer, as Figure 3 shown. The polygonal inner hole d of the sand core mold has the same shape as the outer shape of the cone cap. The inner holes φa and φb of the sand core mold are respectively fitted and installed with the winding mandrels Ma and Mb. The metal joint is installed on the winding mandrel from the other end of the winding mandrel through the inner hole and is in contact with one end face of the sand core mold.

[0032] The outer diameters of all parts are smaller than the inner hole diameter of the metal joint. The winding mandrel is of variable diameter design, Ma, Mb. The thread of its thin-diameter shaft head and the tightening direction of the nut are opposite to the winding and rolling direction of the winding mandrel. The outer shape d of the cone cap can be a quadrilateral, pentagon, or hexagon. The inner square c design of the cone cap can be a quadrilateral, pentagon, or hexagon. The inner hole of the snap is the same as the outer shape of the standard nut, and the outer shape of the snap is the same as the inner square of the cone cap.

[0033] As Figure 4 shown, the inner hole φb of the cone cap is fitted with the winding mandrel Mb, and the outer square d of the cone cap is fitted with the square inner hole d of the sand core mold; the standard nut is connected to the winding mandrel Mb through the thread and can axially move to make the nut, cone cap, and sand core mold fit together.

[0034] As Figure 5 shown, the polygonal inner hole of the snap is fitted with the outer side of the standard nut, and the square outer side c of the snap is fitted with the square inner hole c of the cone cap.

[0035] As Figure 6 shown, the thread Ma of the clamping disc is fitted and installed with the winding mandrel Ma and can axially move to fit with the metal joint.

[0036] The square inner hole of the above sand core mold is fitted with the conical cap, the conical cap is fitted with the buckle, the buckle is fitted with the nut, and the nut is fitted with the winding mandrel through the thread, axially limiting each other. The sand core mold, conical cap, buckle and nut are connected as a whole. Therefore, each part cannot rotate independently circumferentially, realizing the circumferential fixation of the sand core mold and the winding mandrel; the tightening direction of the nut thread is opposite to the winding rotation direction of the mandrel. During winding, the nut becomes tighter and tighter. Combining with the change of the diameter of the winding mandrel, the sand core mold and the winding mandrel are axially limited, realizing the axial fixation of the sand core mold and the winding mandrel.

[0037] Install the conical cap on the winding mandrel. The inner hole φb of the conical cap is fitted with the winding mandrel Mb, and the outer square d of the conical cap is fitted with the square inner hole d of the sand core mold.

[0038] Install a standard nut on the winding mandrel. The standard nut is connected to the winding mandrel Mb through the thread, and tighten the nut until the nut, conical cap and sand core mold are fitted and tightened.

[0039] Fit the polygonal inner hole of the buckle with the outer side of the standard nut, and fit the square outer side c of the buckle with the square inner hole c of the conical cap.

[0040] Install the clamping disc. The thread Ma of the clamping disc is fitted with the thread Ma of the winding mandrel, and axially move it until it fits with the metal joint and tighten it.

[0041] In the square inner hole of the sand core mold, use automotive putty filler to fill the square hole until it smoothly transitions to the outer profile of the hole. The mandrel head Mb, conical cap, nut and buckle are covered.

[0042] Cover the metal joint, the outer surface of the sand core mold and the side of the non-polar hole with an insulating layer, and then perform fiber winding and curing. During winding, the winding machine holds one end of the winding mandrel Ma and rotates clockwise, providing a positive torque for the mandrel. The winding tension provides a counterclockwise reverse torque to the nut through the insulating layer, sand core, conical cap and buckle. At this time, the mandrel and the nut will be tightened more and more and will not loosen.

[0043] During demolding, first remove the clamping disc, then fix the shell and rotate the mandrel counterclockwise; since the shell transfers the torque to the nut through the insulating layer, sand core, conical cap and buckle, the mandrel will separate from the nut when it rotates. After the mandrel is pulled out, dissolve the sand core with hot water and take out the conical cap, buckle and nut together.

[0044] The maximum diameter a of the winding mandrel and the outer diameter a of the conical cap ≤ the inner hole diameter of the metal joint;

[0045] The diameter a of the winding mandrel > the diameter b of the winding mandrel;

[0046] The inner holes φa and φb of the sand core mold are respectively fitted with the winding mandrels Ma and Mb;

[0047] The winding mandrel thread diameter Ma is matched with the clamping disc thread diameter Ma;

[0048] The tapered cap φb is matched with the winding mandrel Mb;

[0049] The tapered cap d is matched with the inner square hole d of the core mold;

[0050] The inner hole of the buckle polygon is matched with the outer side of the standard nut;

[0051] The buckle c is matched with the inner square c of the tapered cap.

Claims

1. The winding tooling for the single-pole hole combustion chamber housing is characterized in that, Comprising: A winding mandrel, the winding mandrel forms a shoulder through a diameter change, and a taper cap, a snap fastener and a nut are installed at the thin-diameter shaft head to achieve axial positioning; A taper cap, the inner hole of the taper cap is matched with the winding mandrel, and the outer side is matched with the inner hole of the core mold; A snap fastener, the outer ring of the snap fastener is matched with the inner hole of the taper cap, the inner hole is matched with the outer ring of the nut, and the nut is connected to the thin shaft of the winding mandrel through a thread; A clamping disc, the clamping disc axially moves along the thread of the winding mandrel on the winding side, fits with the metal joint, and further fastens the core mold; The inner hole of the core mold is matched with the size of the winding mandrel, is connected to the metal joint on the winding side, and is opened on the other side to facilitate the installation of the taper cap snap fastener nut; The tightening direction of the nut thread is opposite to the winding rotation direction of the mandrel, and the maximum diameter of the winding mandrel is the same as the outer diameter of the taper cap.

2. The winding tooling for the unipolar hole combustion chamber shell according to claim 1, characterized in that: The outer ring of the taper cap is quadrilateral or pentagonal or hexagonal.

3. The winding tooling for the single-pole hole combustion chamber housing according to claim 1, characterized in that: The inner hole of the taper cap is quadrilateral or pentagonal or hexagonal.

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