Upsetting machining method for supporting plate screw

Abstract

The invention relates to the field of machining, and discloses an upsetting machining method for a supporting plate screw, rod-shaped metal is cut as a blank, the length of the blank is 2.5-3 times that of the supporting plate screw, and the diameter of the blank is 1.3-1.5 times that of the nominal diameter of the supporting plate screw; after being heated, the blank is put into a hot upsetting die to be subjected to hot upsetting forming, a round plate blank is formed in the middle, one side of the plate blank is a rod blank, and the other side of the plate blank is an excess material rod; turning to cut off excess rods, turning the end face of the plate blank, clamping again, and turning the outer circle and the chamfer of the rod blank and the end face of the other side of the plate blank; the blank is put into a punching die, and the plate blank is punched to form a supporting plate; and putting the blank into a thread rolling machine, and carrying out thread rolling processing on the rod blank to form a thread. The problems of low production efficiency and low material utilization rate of an existing supporting plate screw production and processing technology can be solved.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, and in particular to an upsetting processing method for a support plate screw. Background Art

[0002] The head of a conventional screw is a hexagonal head, a round head or a flat head. A support screw is a screw with a plate-shaped head, usually composed of a support plate 1, a rod 2, and a thread 3, such as Figure 1 As shown. Figure 2 As shown, the conventional processing method of the pallet screw is to select a rod with a diameter larger than the outer diameter of the pallet, and obtain the rod and the head through mechanical cutting. The head is a circular plate, and then the head is punched to form the pallet, and then the rod is rolled or threaded to form the thread. This processing method requires the use of a rod-shaped material with a larger diameter. During the cutting process, more raw materials are cut from the rod, and the material utilization rate is low. The cutting process must take into account the feed amount, and the cutting takes a long time. In short, the existing pallet screw production and processing technology has low production efficiency and low material utilization. Summary of the invention

[0003] The present invention aims to provide a method for upsetting a support plate screw, so as to solve the problems of low production efficiency and low material utilization rate in the existing production and processing technology of the support plate screw.

[0004] To achieve the above object, the present invention adopts the following technical solution: a method for upsetting a support plate screw, comprising the following steps:

[0005] A. Cutting: Cut the rod-shaped metal into blanks. The length of the blank is 2.5-3 times the length of the pallet screw, and the diameter of the blank is 1.3-1.5 times the nominal diameter of the pallet screw;

[0006] B. Hot upsetting: After heating the blank, put it into the hot upsetting die for hot upsetting to form a circular slab in the middle, with one side of the slab being the rod blank and the other side being the remaining rod;

[0007] C. Machining: Machining is to cut off the remaining rod and turn the end face of the slab. After re-clamping, the outer circle of the rod, chamfer and the other side end face of the slab are turned;

[0008] D. Punching process: placing the blank into a punching die and punching the blank to form a pallet;

[0009] E. Thread rolling: put the blank into the thread rolling machine to roll the rod blank into thread-forming thread.

[0010] Preferably, as an improvement, in step B, the single-side machining allowance of the slab is greater than 2 mm, and the radial machining allowance of the rod is greater than 2 mm.

[0011] Preferably, as an improvement, in step D, the slab is punched into a diamond-shaped support plate, and arc transition edges are punched at the four corners of the support plate, and two through holes are formed on both sides of the rod on the long axis of the support plate.

[0012] Preferably, as an improvement, step B controls the single-piece working time to be less than or equal to 0.65 min / piece.

[0013] Preferably, as an improvement, step C controls the single-piece working time to be less than or equal to 5 min / piece.

[0014] In this scheme, a rod material with a diameter close to the diameter of the rod of the support plate screw is selected in the blanking stage, and the length is cut according to a specific ratio. Then, the blank with a plate blank is formed by hot upsetting and the mold is used. This is a near-net forming method. The blank after hot upsetting is then processed by a CNC lathe to process the end face and outer circle, and then punched and rolled to form a support plate screw. The diameter of the rod-shaped raw material used in the conventional machining method needs to be larger than the shape of the support plate, and a punching margin must be reserved. The radial dimensions between the support plate and the rod part are quite different, resulting in a large amount of processing required to form the rod part, resulting in a long processing time and a large waste of materials. In this scheme, a hot upsetting method is used to upset the thinner rod material to form a plate blank, and the rod material can be formed into a rod blank by a small deformation. In this way, the forming process of the rod blank and the plate blank only needs to be upset once on the hot upsetting machine, which takes a short time and is highly efficient. After CNC machining, only a small amount of processing margin on the plate blank and the rod blank needs to be processed to the forming size, and less material waste. And the working hours of hot upsetting and lathe can be controlled. By comparison, taking M6×20 pallet screws as an example, in the conventional machining forming method, the processing time of a single piece is 15.45 min / piece, the material of a single piece is φ30×26, the weight of a single piece is 146 grams, and the material utilization rate is 4.7%. However, when this scheme is used, the processing time of a single piece is only 5.88 min / piece, the material of a single piece is φ8.5×58, the weight of a single piece is 26 grams, and the material utilization rate is 26.6%. It can be seen that the production efficiency can be increased by about 2.6 times, and the material utilization rate can be increased by about 5 times. In the process of mass production, the production capacity can be significantly improved, the material utilization rate can be improved, and the production cost can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the support plate screw of the present invention.

[0016] Figure 2 The present invention is a schematic diagram of the process of processing support plate screws according to the prior art.

[0017] Figure 3 Schematic diagram of the blank structure in the hot upsetting process in an embodiment of the present invention.

[0018] Figure 4 It is a schematic diagram of the process of lathe processing in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The reference numerals in the drawings of the specification include: a support plate 1 , a rod portion 2 , a thread 3 , a plate blank 4 , a rod blank 5 , and a residual material rod 6 .

[0021] Embodiment: A method for upsetting a support plate screw comprises the following steps:

[0022] A. Cutting: Cut the rod-shaped metal into blanks. The length of the blank is 2.5-3 times the length of the pallet screw, and the diameter of the blank is 1.3-1.5 times the nominal diameter of the pallet screw;

[0023] B. Hot upsetting, such as Figure 3 As shown, the blank is heated and put into a hot upsetting die for hot upsetting, forming a circular slab 4 in the middle, one side of the slab 4 is a rod 5, and the other side is a residual rod 6. The machining allowance of the slab 4 on one side is greater than 2 mm, and the radial machining allowance of the rod 5 is greater than 2 mm. The single-piece working time is controlled to be less than or equal to 0.65 min / piece.

[0024] C. Number of lathe processes, such as Figure 4 As shown, the remaining rod 6 is cut off by lathe and the end face of the slab 4 is lathe. After re-clamping, the outer circle of the rod 5 and the chamfer and the end face of the other side of the slab 4 are lathe. The single-piece working time is controlled to be less than or equal to 5min / piece.

[0025] D. Punching process: placing the blank into a punching die, punching the slab 4, punching the slab 4 into a rhombus-shaped support plate 1, punching the four corners of the support plate 1 to form arc transition edges, and forming two through holes on both sides of the rod 2 on the long axis of the support plate 1;

[0026] E. Thread rolling: put the blank into a thread rolling machine to perform thread rolling on the rod 2 to form a thread 3.

[0027] The specific implementation process is as follows: In the blanking stage, a rod material with a diameter close to the diameter of the screw rod 2 of the support plate 1 is selected, and the length is cut according to a specific ratio, and then the blank with the plate blank 4 is formed by hot upsetting and the mold is matched, which is a near-net forming method. The blank after hot upsetting is then processed by a CNC lathe to process the end face and outer circle, and then punched and rolled to form the support plate 1 screw. The diameter of the rod-shaped raw material used in the conventional machining method needs to be larger than the shape of the support plate 1, and a punching margin must be reserved. The radial dimensions between the support plate 1 and the rod 2 are quite different, resulting in a large amount of processing required to form the rod 2, resulting in a long processing time and a large waste of materials. The present scheme uses hot upsetting to upset the thinner rod material to form the plate blank 4, and the rod material can be formed into the rod blank 5 by a smaller deformation. In this way, the forming process of the rod blank 5 and the plate blank 4 only needs to be formed by one upsetting on the hot upsetting machine, which is time-saving and efficient. After the lathe processing, only a small amount of machining allowance on the plate blank 4 and the rod blank 5 needs to be machined to the forming size, and there is little waste of material. In addition, the working hours of hot upsetting and lathe can be controlled. By comparison, taking the M6×20 pallet 1 screw as an example, the conventional machining forming method requires 15.45min / piece processing time, the material used for a single piece is φ30×26, the weight of a single piece is 146g, and the material utilization rate is 4.7%. However, when this scheme is used, the processing time of a single piece is only 5.88min / piece, the material used for a single piece is φ8.5×58, the weight of a single piece is 26g, and the material utilization rate is 26.6%. It can be seen that the production efficiency can be increased by about 2.6 times, and the material utilization rate can be increased by about 5 times. In the process of mass production, the production capacity can be significantly improved, the material utilization rate can be improved, and the production cost can be effectively reduced.

[0028] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for upsetting a support plate screw, characterized in that: The following steps are involved: A. Cutting: Cut the rod-shaped metal into blanks. The length of the blank is 2.5-3 times the length of the pallet screw, and the diameter of the blank is 1.3-1.5 times the nominal diameter of the pallet screw; B. Hot upsetting: After heating the blank, put it into the hot upsetting die for hot upsetting to form a circular slab in the middle, with one side of the slab being the rod blank and the other side being the remaining rod; C. Machining: Machining is to cut off the remaining rod and turn the end face of the slab. After re-clamping, the outer circle of the rod, chamfer and the other side end face of the slab are turned; D. Punching process: placing the blank into a punching die and punching the blank to form a pallet; E. Thread rolling: put the blank into the thread rolling machine to roll the rod blank into thread-forming thread.

2. The method for upsetting a support plate screw according to claim 1, characterized in that: In step B, the single-side machining allowance of the slab is greater than 2 mm, and the radial machining allowance of the rod is greater than 2 mm.

3. The method for upsetting a support plate screw according to claim 2, characterized in that: In step D, the slab is punched into a diamond-shaped support plate, and arc transition edges are punched at the four corners of the support plate. At the same time, two through holes located on both sides of the rod are formed on the long axis of the support plate.

4. The method for upsetting a support plate screw according to claim 3, characterized in that: In step B, the working time of a single piece is controlled to be less than or equal to 0.65 min / piece.

5. The method for upsetting a support plate screw according to claim 4, characterized in that: Step C controls the single-piece working time to be less than or equal to 5 minutes / piece.

Images