A production process for a loom shedding cam assembly

Abstract

This invention discloses a manufacturing process for a shedding cam assembly for a loom, relating to the field of shedding cam assembly technology. The invention includes the following steps: SS01, machining cam blanks; SS02, selecting and assembling detachable modular spacers according to the required axial spacing and phase angle between adjacent cam blanks in the target cam assembly; SS03, mounting the cam blanks and spacers onto a mandrel to form a sintering assembly in which all cam blanks and spacers are stacked axially. This invention first presses metal powder into cam blanks with positioning openings, then assembles multiple cam blanks onto a mandrel using detachable modular spacers at a preset phase angle and axial spacing, followed by integral sintering. This allows all cam blanks to simultaneously form a metallurgical bond with the mandrel during the shrinkage and densification process, ensuring the connection strength of the metallurgical bond while achieving flexible adjustment of the phase angle and spacing, significantly simplifying the production process.

Description

Technical Field

[0001] This invention belongs to the technical field of shedding cam assembly, and in particular relates to a manufacturing process for a shedding cam assembly for a loom. Background Technology

[0002] In the shedding mechanism of a high-speed loom, the up-and-down movement of the heald frame is determined by the contour curve of the conjugate cam. The shedding cam assembly of the loom consists of a mandrel and multiple cams mounted on the mandrel.

[0003] Traditionally, there are several main processes for manufacturing cam plates: 1. Integral forging process: The metal billet is heated and forged into a cam blank, and then the cam profile is completed by cutting. This process has a low material utilization rate, and a lot of machining is required to remove the excess material after forging, resulting in a long production cycle.

[0004] 2. Casting process: Molten metal is poured into a mold to form a cam blank, and then the final contour is completed by machining. The cast cam may have defects such as shrinkage cavities and porosity inside, and its mechanical properties are relatively poor.

[0005] 3. Stamping process: Suitable for thin sheet cams with small loads. The metal sheet is stamped with a die to cut out the working surface and shaft hole of the cam in one go. This process is efficient and low cost, but it is not suitable for thick cross sections or cams that bear heavy loads.

[0006] 4. Powder metallurgy can also be used to manufacture cam plates: metal powder is pressed into shape in a mold and then sintered at high temperature to make it dense. Powder metallurgy has high material utilization, can achieve near-net-shape forming, reduces the amount of subsequent machining, and the material composition can be flexibly adjusted to obtain the required wear resistance and strength.

[0007] Regarding the assembly of the cam assembly, traditionally, pre-manufactured cam plates are fixed to the mandrel piece by piece using key connections, interference fit hot pressing, or bolt fastening. When it is necessary to change the phase angle configuration between adjacent cam plates to adapt to different fabric structures, the installation angle of each cam plate must be readjusted or spacers of different specifications must be replaced, resulting in low production efficiency. In addition, mechanical assembly connections are prone to fretting wear and loosening under long-term high-speed operation, affecting the motion accuracy of the opening mechanism. Summary of the Invention

[0008] The purpose of this invention is to provide a manufacturing process for a loom shedding cam assembly. First, metal powder is pressed into cam blanks with positioning openings. Then, multiple cam blanks are stacked and assembled onto a mandrel using detachable modular spacers according to a preset phase angle and axial spacing. Subsequently, they are integrally sintered, allowing all cam blanks to simultaneously form a metallurgical bond with the mandrel during the shrinkage and densification process. This entire process integrates cam blank forming, phase angle setting, spacing control, and simultaneous connection of multiple blanks into a single sintering step, ensuring the strength of the metallurgical bond while achieving flexible adjustment of the phase angle and spacing, significantly simplifying the production process.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a manufacturing process for a loom shedding cam assembly, comprising the following steps: SS01 presses metal powder into multiple cam blanks in a mold. The cam blanks have a central through hole, a working surface, and two symmetrically distributed positioning holes integrally formed on the cam blanks. SS02 Select and assemble a detachable modular spacer based on the required axial spacing and phase angle between adjacent cam plates in the target cam assembly. The spacer is constructed such that, after assembly, it forms an annulus with two first positioning ends and two second positioning ends at its two ends, and there is a circumferential phase difference between the first positioning ends and the second positioning ends corresponding to the required phase angle. The axial thickness of the spacer is consistent with the required axial spacing. SS03 places the mandrel to be sintered on the assembly table. First, an axial locking component is assembled at the selected position. Then, the cam blanks and the spacers assembled in SS02 are alternately placed on the mandrel, so that the first and second positioning ends of each spacer are inserted into the positioning holes of two adjacent cam blanks, forming a sintering assembly in which all cam blanks and spacers are stacked axially. Finally, a second axial locking component is installed on the mandrel to axially press and fix the stacked sintering assembly. SS04 places the assembly to be sintered obtained from SS03 in a sintering furnace and sintersing it at a predetermined sintering temperature, so that each cam blank forms a metallurgical bond with the mandrel during the shrinkage and densification process. The spacer keeps the axial spacing and phase angle of each cam blank unchanged during the sintering process. After SS05 sintering is completed, release the axial locking parts and remove all spacers from the mandrel; SS06 performs precision grinding on the working surface of the cam assembly blank after the spacer is removed to obtain the loom shedding cam assembly.

[0010] Furthermore, the spacer in the SS02 includes a base positioning ring, a variable positioning ring, and a clamping structure: The base positioning ring is composed of two centrally symmetrical first half-rings. The base positioning ring is circular in shape. The outer ring surface of the base positioning ring is provided with two first positioning ends. The inner ring surface of the base positioning ring is provided with two first outward protrusions. The first outward protrusions are opposite to the first positioning ends. The variable positioning ring is composed of two centrally symmetrical second half-rings. The variable positioning ring is circular in shape. The outer ring surface of the variable positioning ring is provided with two second positioning ends. The inner ring surface of the variable positioning ring is provided with two second outward protrusions. The second outward protrusions and the second positioning ends have a preset phase deflection angle α in the circumferential direction. The hoop structure includes two symmetrically arranged half-hoops connected by bolts. The inner wall of each half-hoop has a semi-circular ring-shaped intermediate layer. The inner and outer sides of the intermediate layer have notches. The notches on the same side of the two adjacent ends of the two half-hoops form a positioning groove that cooperates with the first and second outward protrusions.

[0011] Furthermore, when assembling the spacer in the SS02, the docked base positioning ring and variable positioning ring are respectively embedded into the clamping structure from both ends of the axial direction, so that the first and second outward protrusions are respectively embedded into the corresponding positioning grooves, and the bolts are tightened to form the spacer. At this time, the first and second positioning ends on both sides of the spacer have a phase deflection angle α in the circumferential direction.

[0012] Furthermore, both axial end faces of the clamp structure extend beyond the thickness of the intermediate layer to form mounting positions. The base positioning ring and the variable positioning ring are concentrically arranged within the mounting positions, and their outer surfaces extend beyond the end faces of the clamp structure. The thickness of the spacer is the sum of the thickness of the intermediate layer, the thickness of the base positioning ring, and the thickness of the variable positioning ring.

[0013] Furthermore, in the SS02, by selecting a variable positioning ring with a different phase deflection angle α, the required phase angle between adjacent cam plates is set, and the phase deflection angle α on the variable positioning ring is set in the range of 15-180°.

[0014] Furthermore, the specific steps for removing the spacer from the mandrel in SS05 are as follows: first, remove the bolts of the clamp structure, then radially separate and remove the two half-clamps, then radially separate and remove the two first half-rings that constitute the base positioning ring, and finally radially separate and remove the two second half-rings that constitute the variable positioning ring.

[0015] Furthermore, the positioning port is a circular through hole structure, and both the first positioning end and the second positioning end are cylindrical structures. The thickness of the first positioning end and the second positioning end is the same, and both are less than or equal to half the thickness of the cam blank.

[0016] Furthermore, in SS02, before assembling the spacer, a boron nitride isolation coating is applied to the surface of the spacer that comes into contact with the cam blank and the mandrel to prevent metallurgical bonding between the spacer and the cam blank or mandrel during sintering.

[0017] Furthermore, the axial locking component consists of a set of symmetrically arranged metal locking hoops connected by fasteners. Graphite hoops are fixed to the inner walls of both metal locking hoops. The inner walls of the graphite hoops are in contact with the outer surface of the mandrel. The end face of the axial locking component abuts against the end face of the outermost cam blank to apply axial clamping force to the stacked assembly to be sintered during locking.

[0018] Furthermore, the base material of the spacer is selected as heat-resistant alloy steel whose coefficient of thermal expansion differs from the average coefficient of thermal expansion of the cam blank within the sintering temperature range by less than or equal to 20%.

[0019] The present invention has the following beneficial effects: 1. This invention first presses metal powder into cam blanks with positioning openings, then stacks and assembles multiple cam blanks onto a mandrel using detachable modular spacers according to a preset phase angle and axial spacing. Subsequently, it performs integral sintering, so that all cam blanks simultaneously form a metallurgical bond with the mandrel during the shrinkage and densification process. The entire process integrates cam blank forming, phase angle setting, spacing control, and multi-piece synchronous connection into a single sintering process, eliminating the need for piece-by-piece mechanical assembly. After sintering, the spacers can be completely removed and reused, ensuring the connection strength of the metallurgical bond and achieving flexible adjustment of the phase angle and spacing, significantly simplifying the production process.

[0020] 2. This invention, through the design of detachable modular spacers, allows for flexible adjustment of the phase angle between adjacent cam plates within the same tooling system simply by replacing variable positioning rings of different specifications. The axial spacing is controlled by the thickness of the spacers themselves, enabling rapid setting of the phase angle and spacing before sintering of the cam assembly. The entire process eliminates the need for machining positioning structures on the mandrel. After sintering, the spacers can be completely removed and reused. This ensures the metallurgical bonding strength of the powder metallurgy combined sintering and overcomes the shortcomings of traditional processes where positioning tooling cannot be removed or the phase angle cannot be flexibly adjusted. This significantly improves the flexibility and efficiency of loom sheathing cam assembly production. 3. The phase angle positioning of the cam plate of the present invention is achieved by the positioning ends of the spacer at both ends cooperating with the positioning port on the cam plate. No positioning groove or keyway needs to be opened on the surface of the mandrel, which maintains a smooth cylindrical surface, avoids stress concentration caused by abrupt changes in cross section, and improves the fatigue life of the mandrel under high-speed operation.

[0021] 4. This invention designs a detachable spacer. The base positioning ring and the variable positioning ring are formed by two half-rings joined together. The hoop structure is formed by two half-hoops connected by bolts. After sintering, each component can be separated and removed one by one along the radial direction without leaving any residue on the cam assembly. The spacer can be reused in the manufacturing of the next assembly, reducing tooling costs.

[0022] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the assembly to be sintered in SS03 of the present invention; Figure 2 This is a schematic diagram of the cam blank. Figure 3 A schematic diagram of the base positioning ring side of the spacer; Figure 4 This is a schematic diagram of the variable positioning ring side of the spacer; Figure 5 This is a partial structural cross-sectional view of the assembly to be sintered in SS03 of the present invention; The attached diagram lists the components represented by each number as follows: 1-Cam blank, 2-Spacer, 3-Axial locking element, 4-Mandrel, 101-Central through hole, 102-Working surface, 103-Positioning port, 201-First positioning end, 202-Second positioning end, 203-Base positioning ring, 204-Variable positioning ring, 205-Clamping structure, 206-First external protrusion, 207-Second external protrusion, 208-Intermediate layer, 209-Notch, 301-Metal locking clamp, 302-Graphite clamp. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-5 As shown, the present invention relates to a manufacturing process for a loom shedding cam assembly, comprising the following steps: SS01 presses metal powder into multiple cam blanks 1 in a mold. The cam blank 1 has a central through hole 101, a working surface 102, and two symmetrically distributed positioning holes 103 integrally formed on the cam blank 1. SS02 Based on the required axial spacing and phase angle between adjacent cam plates in the target cam assembly, select and assemble a detachable modular spacer 2. The spacer 2 is constructed such that after assembly, it forms an annulus with two first positioning ends 201 and two second positioning ends 202 at its two ends, and there is a circumferential phase difference between the first positioning ends 201 and the second positioning ends 202 corresponding to the required phase angle. The axial thickness of the spacer 2 is consistent with the required axial spacing. SS03 Place the mandrel 4 to be sintered on the assembly table. First, assemble an axial locking component 3 at the selected position. Then, alternately and sequentially place the cam blank 1 and the spacer 2 assembled in SS02 onto the mandrel 4, so that the first positioning end 201 and the second positioning end 202 of each spacer 2 are inserted into the positioning holes 103 of two adjacent cam blanks 1, forming a sintering assembly in which all cam blanks 1 and spacers 2 are stacked axially. Finally, install the second axial locking component 3 on the mandrel 4 to axially press and fix the stacked sintering assembly. SS04 The assembly to be sintered obtained by SS03 is placed in a sintering furnace and sintered at a predetermined sintering temperature so that each cam blank 1 forms a metallurgical bond with the mandrel 4 during the shrinkage and densification process. The spacer 2 keeps the axial spacing and phase angle of each cam blank 1 unchanged during the sintering process. After SS05 sintering is completed, release the axial locking member 3 and remove all spacers 2 from the mandrel 4; SS06 performs precision grinding on the cam working surface of the cam assembly blank after removing the spacer 2 to obtain the loom shedding cam assembly. During this process, the spindle 4 itself can be machined, such as the length of both ends, the opening of the keyway, etc.

[0027] Among them, such as Figure 3-5As shown, the spacer 2 in SS02 includes a base positioning ring 203, a variable positioning ring 204, and a clamping structure 205: The base positioning ring 203 is composed of two centrally symmetrical first half-rings. The base positioning ring 203 is circular in shape. The outer ring surface of the base positioning ring 203 is provided with two first positioning ends 201, and the inner ring surface of the base positioning ring 203 is provided with two first outward protrusions 206. The first outward protrusions 206 are opposite to the first positioning ends 201. The variable positioning ring 204 is composed of two centrally symmetrical second half-rings. The variable positioning ring 204 is circular in shape. The outer ring surface of the variable positioning ring 204 is provided with two second positioning ends 202, and the inner ring surface of the variable positioning ring 204 is provided with two second outward protrusions 207. The second outward protrusions 207 and the second positioning ends 202 have a preset phase deflection angle α in the circumferential direction. The hoop structure 205 includes two symmetrically arranged half-hoops connected by bolts. The inner wall of the half-hoops is provided with a semi-circular ring structure intermediate layer 208. The inner and outer sides of both ends of the intermediate layer 208 are provided with notches 209. The notches 209 on the same side of the adjacent ends of the two half-hoops form a positioning groove that cooperates with the first convex part 206 and the second convex part 207.

[0028] Among them, such as Figure 3-5 As shown, when assembling spacer 2 in SS02, the docked base positioning ring 203 and variable positioning ring 204 are respectively embedded into the clamping structure 205 from both ends of the axial direction, so that the first external protrusion 206 and the second external protrusion 207 are respectively embedded into the corresponding positioning grooves. The bolts are tightened to form spacer 2. At this time, the first positioning end 201 and the second positioning end 202 on both sides of spacer 2 have a phase deflection angle α in the circumferential direction.

[0029] Among them, such as Figure 3-5 As shown, both axial end faces of the hoop structure 205 extend beyond the thickness of the intermediate layer 208 to form mounting positions. The base positioning ring 203 and the variable positioning ring 204 are concentrically arranged within the mounting positions and their outer surfaces extend beyond the end faces of the hoop structure 205. The thickness of the spacer 2 is composed of the sum of the thickness of the intermediate layer 208, the thickness of the base positioning ring 203, and the thickness of the variable positioning ring 204.

[0030] In SS02, by selecting a variable positioning ring 204 with different phase deflection angles α, the required phase angle between adjacent cam plates is set, and the phase deflection angle α on the variable positioning ring 204 is set in the range of 15-180°.

[0031] Specifically, the steps for removing the spacer 2 from the spindle 4 in SS05 are as follows: first, remove the bolts of the hoop structure 205, then radially separate and remove the two half-hoops, then radially separate and remove the two first half-rings that constitute the base positioning ring 203, and finally radially separate and remove the two second half-rings that constitute the variable positioning ring 204.

[0032] Among them, such as Figure 2-5 As shown, the positioning port 103 is a circular through hole structure, and the first positioning end 201 and the second positioning end 202 are both cylindrical structures. The thickness of the first positioning end 201 and the second positioning end 202 is the same, and both are less than or equal to half the thickness of the cam blank 1.

[0033] In SS02, before assembling the spacer 2, a boron nitride isolation coating is applied to the surface of the spacer 2 that comes into contact with the cam blank 1 and the mandrel 4 to prevent metallurgical bonding between the spacer 2 and the cam blank 1 or the mandrel 4 during the sintering process.

[0034] Among them, such as Figure 1 As shown, the axial locking member 3 consists of a set of symmetrically arranged metal locking hoops 301 connected by fasteners. Graphite hoops 302 are fixed to the inner walls of both metal locking hoops 301. The inner walls of the graphite hoops 302 are in contact with the outer surface of the mandrel 4. The end face of the axial locking member 3 abuts against the end face of the outermost cam blank 1 to apply axial clamping force to the stacked assembly to be sintered during locking.

[0035] Among them, the base material of the spacer 2 is selected as heat-resistant alloy steel whose coefficient of thermal expansion is less than or equal to 20% different from the average coefficient of thermal expansion of the cam blank 1 in the sintering temperature range.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0037] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A manufacturing process for a loom shedding cam assembly, characterized in that: Includes the following steps: SS01 presses metal powder into multiple cam blanks (1) in a mold. The cam blanks (1) have a central through hole (101), a working surface (102), and two symmetrically distributed positioning holes (103) integrally formed on the cam blanks (1). SS02 Select and assemble a detachable modular spacer (2) according to the required axial spacing and phase angle between adjacent cam plates in the target cam assembly. The spacer (2) is constructed such that after assembly, it forms an annulus with two first positioning ends (201) and two second positioning ends (202) at both ends, and there is a circumferential phase difference between the first positioning ends (201) and the second positioning ends (202) corresponding to the required phase angle. The axial thickness of the spacer (2) is consistent with the required axial spacing. SS03 Place the mandrel (4) to be sintered on the assembly table, first assemble an axial locking component (3) at the selected position, then alternately put the cam blank (1) and the spacer (2) assembled in SS02 onto the mandrel (4), so that the first positioning end (201) and the second positioning end (202) of each spacer (2) are inserted into the positioning holes (103) of two adjacent cam blanks (1) respectively, forming a sintering assembly in which all cam blanks (1) and spacers (2) are stacked axially, and finally install the second axial locking component (3) on the mandrel (4) to axially press and fix the stacked sintering assembly; SS04 The sintering assembly obtained by SS03 is placed in a sintering furnace and sintered at a predetermined sintering temperature so that each cam blank (1) forms a metallurgical bond with the mandrel (4) during the shrinkage and densification process. The spacer (2) keeps the axial spacing and phase angle of each cam blank (1) unchanged during the sintering process. After SS05 sintering is completed, release the axial locking member (3) and remove all spacers (2) from the mandrel (4); SS06 The working surface of the cam of the cam assembly blank after the spacer (2) is removed is precision ground to obtain the loom shedding cam assembly.

2. The manufacturing process of a loom shedding cam assembly according to claim 1, characterized in that, The spacer (2) in SS02 includes a base positioning ring (203), a variable positioning ring (204), and a clamping structure (205): The base positioning ring (203) is composed of two centrally symmetrical first half-rings. The base positioning ring (203) is circular in shape. The outer ring surface of the base positioning ring (203) is provided with two first positioning ends (201). The inner ring surface of the base positioning ring (203) is provided with two first outward protrusions (206). The first outward protrusions (206) are opposite to the first positioning ends (201). The variable positioning ring (204) is composed of two centrally symmetrical second half rings. The variable positioning ring (204) is circular in shape. The outer ring surface of the variable positioning ring (204) is provided with two second positioning ends (202). The inner ring surface of the variable positioning ring (204) is provided with two second outward protrusions (207). The second outward protrusions (207) and the second positioning ends (202) have a preset phase deflection angle α in the circumferential direction. The hoop structure (205) includes two symmetrically arranged half-hoops connected by bolts. The inner wall of the half-hoops is provided with a semi-circular ring structure intermediate layer (208). The inner and outer sides of the intermediate layer (208) are provided with notches (209). The notches (209) on the same side of the two half-hoops at adjacent ends form positioning grooves that cooperate with the first convex part (206) and the second convex part (207).

3. The manufacturing process of a loom shedding cam assembly according to claim 2, characterized in that, When assembling the spacer (2) in the SS02, the docked base positioning ring (203) and variable positioning ring (204) are respectively embedded into the clamping structure (205) from both ends of the axial direction, so that the first external protrusion (206) and the second external protrusion (207) are respectively embedded into the corresponding positioning grooves, and the bolts are tightened to form the spacer (2). At this time, the first positioning end (201) and the second positioning end (202) on both sides of the spacer (2) have a phase deflection angle α in the circumferential direction.

4. The manufacturing process of a loom shedding cam assembly according to claim 3, characterized in that, The axial end faces of the clamp structure (205) both extend beyond the thickness of the intermediate layer (208) and form mounting positions. The base positioning ring (203) and the variable positioning ring (204) are concentrically arranged in the mounting positions and their outer surfaces extend beyond the end faces of the clamp structure (205). The thickness of the spacer (2) is the sum of the thickness of the intermediate layer (208), the thickness of the base positioning ring (203), and the thickness of the variable positioning ring (204).

5. The manufacturing process of a loom shedding cam assembly according to claim 2, characterized in that, In the SS02, the required phase angle between adjacent cam plates is set by selecting a variable positioning ring (204) with different phase deflection angles α. The phase deflection angle α on the variable positioning ring (204) is set in the range of 15-180°.

6. The manufacturing process of a loom shedding cam assembly according to claim 2, characterized in that, The specific steps for removing the spacer (2) from the mandrel (4) in the SS05 are as follows: first, remove the bolts of the hoop structure (205), then radially separate and remove the two half-hoops, then radially separate and remove the two first half-rings that constitute the base positioning ring (203), and finally radially separate and remove the two second half-rings that constitute the variable positioning ring (204).

7. The manufacturing process of a loom shedding cam assembly according to claim 1, characterized in that, The positioning port (103) is a circular through hole structure. The first positioning end (201) and the second positioning end (202) are both cylindrical structures. The thickness of the first positioning end (201) and the second positioning end (202) is the same, and both are less than or equal to half the thickness of the cam blank (1).

8. The manufacturing process of a loom shedding cam assembly according to claim 1, characterized in that, Before assembling the spacer (2), the SS02 is coated with a boron nitride isolation coating on the surface of the spacer (2) that comes into contact with the cam blank (1) and the mandrel (4) to prevent metallurgical bonding between the spacer (2) and the cam blank (1) or the mandrel (4) during the sintering process.

9. The manufacturing process of a loom shedding cam assembly according to claim 1, characterized in that, The axial locking member (3) consists of a set of symmetrically arranged metal locking hoops (301) connected by fasteners. Graphite hoops (302) are fixed to the inner walls of both metal locking hoops (301). The inner walls of the graphite hoops (302) are in contact with the outer surface of the mandrel (4). The end face of the axial locking member (3) abuts against the end face of the outermost cam blank (1) to apply axial clamping force to the stacked assembly to be sintered when locking.

10. The manufacturing process of a loom shedding cam assembly according to claim 1, characterized in that, The base material of the spacer (2) is heat-resistant alloy steel whose coefficient of thermal expansion differs from the average coefficient of thermal expansion of the cam blank (1) within the sintering temperature range by less than or equal to 20%.

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