Special die and cold pressing die assembly based on two-way necking of round pipe

Abstract

The utility model relates to the field of circular tube processing, and provides a special die based on bidirectional necking of a circular tube and a cold pressing die assembly, which are characterized in that the special die based on bidirectional necking of the circular tube is arranged at the end part of the processed circular tube; the special die based on the two-way necking of the circular pipe comprises a main body part and a guide part, a taper leading-in structure, an equal-diameter necking structure and an end face spigot limiting structure are sequentially arranged in the main body part; the guide part is detachably mounted at one end, provided with the taper lead-in structure, of the main body part; according to the utility model, the guide part and the main body part are detachably connected, so that the main body part can be replaced by a new part conveniently after being abraded, and the material cost is effectively reduced; meanwhile, the two ends of the circular tube can be simultaneously subjected to necking processing by using the special die based on the two-way necking of the circular tube at normal temperature, so that the production efficiency is effectively improved; and two ends are necked at the same time, secondary positioning is not needed, and the product machining precision is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of round pipe processing, especially a special mould and cold press mould assembly based on two-way necking of round pipe. BACKGROUND

[0002] Metal round pipe necking is a common production process, which reduces the outer diameter of the end of the round pipe to adapt to the shaft, pipe parts with smaller diameter, and is widely used in various pipelines, automobile axle and other products.

[0003] For small diameter, thin-walled pipe with light weight, and small necking force, double-end alternating necking process or spinning process is usually used. For large diameter, thick-walled pipe, it is usually necked twice after heating.

[0004] The pipe surface processed by the above process is seriously oxidized and has poor precision. INVENTION CONTENTS

[0005] The utility model discloses a special mould and cold press mould assembly based on two-way necking of round pipe, which is connected with the main part in a detachable manner. When the guide part is worn out, the main part can be replaced, effectively reducing the material cost. At the same time, the special mould based on two-way necking of round pipe can be used to neck both ends of the round pipe at the same time at room temperature, effectively improving the production efficiency. Since both ends are necked at the same time, there is no need for secondary positioning, effectively improving the product processing precision.

[0006] The technical scheme of the utility model is as follows:

[0007] A special mould based on two-way necking of round pipe, comprising:

[0008] The special mould based on two-way necking of round pipe is installed at the end of the processed round pipe.

[0009] The special mould based on two-way necking of round pipe comprises a main part and a guide part.

[0010] The main part is internally provided with a taper guide-in structure, an equal-diameter necking structure and an end face stop limit structure in sequence.

[0011] The guide part is detachably installed at one end of the main part provided with the taper guide-in structure.

[0012] The guide part is internally provided with a guide structure, which communicates with the taper guide-in structure.

[0013] Further, the guide part is installed at the end of the taper guide-in structure through bolts.

[0014] Further, the taper guide-in structure, the constant-diameter necking structure, the end face stop limit structure and the guide structure are all inner hole structures that are adapted to the outer diameter of the processed circular pipe.

[0015] Further, the diameter of the end face stop limit structure is smaller than the diameter of the constant-diameter necking structure.

[0016] The diameter of the taper guide-in structure is a gradually changing diameter.

[0017] The diameter of the constant-diameter necking structure is equal to the small-diameter end diameter of the taper guide-in structure.

[0018] The diameter of the guide structure is equal to the diameter of the large-diameter end of the taper guide-in structure.

[0019] Further, the diameter of the guide structure is gap-fitted with the outer diameter of the processed circular pipe.

[0020] Further, the cold-pressing die assembly comprises the special die based on the circular pipe bidirectional necking according to any one of the above.

[0021] The special die based on the circular pipe bidirectional necking is provided with two sets.

[0022] The two sets of the special die based on the circular pipe bidirectional necking are oppositely arranged.

[0023] The two sets of the special die based on the circular pipe bidirectional necking are respectively installed at two ends of the processed circular pipe.

[0024] The guide portion and the main body portion are detachably connected, so that the main body portion can be replaced after wearing, and the material cost is effectively reduced; meanwhile, the special die based on the circular pipe bidirectional necking can be used to simultaneously perform necking processing on two ends of the circular pipe at normal temperature, and the production efficiency is effectively improved; and the two ends are simultaneously necked, and secondary positioning is not needed, and the product processing precision is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0026] Figure 1 It is a perspective structure sectional view of the special die based on the circular pipe bidirectional necking in the embodiment of the present application.

[0027] Figure 2 It is a perspective structure sectional view of the special die based on the circular pipe bidirectional necking in the embodiment of the present application. Figure 1A front view structure sectional view of a special mold based on a double-direction necking of a round pipe is shown in the figure.

[0028] Figure 3 For Figure 2 A matching state schematic view after a cold necking of a round pipe based on a special mold of a double-direction necking of a round pipe is shown in the figure.

[0029] Mark explanation: main body part 1; guide part 2; bolt 21; guide structure 22; taper lead-in structure 3; constant diameter necking structure 4; end face stop limit structure 5; round pipe 6. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] In the specific embodiment one of the utility model, see Figures 1-3 A special mold based on a double-direction necking of a round pipe, comprising: for a cold pressing mold assembly, the special mold based on a double-direction necking of a round pipe is installed at the end of the processed round pipe 6;

[0032] Because the main body part is in a harsh working condition, is easy to wear and tear, and has a long service life, the guide part has a long service life, therefore the special mold based on a double-direction necking of a round pipe is designed to comprise a main body part 1 and a guide part 2, the guide part 2 can be detached after the main body part 1 is worn and torn, and a new main body part is replaced, and the design is a split structure, which effectively saves the processing cost;

[0033] The main body part 1 is sequentially provided with a taper lead-in structure 3, a constant diameter necking structure 4 and an end face stop limit structure 5 inside; the end face stop limit structure 5 is provided, the formed size is stable, and the processing quality and processing efficiency are further improved;

[0034] The guide part 2 is detachably installed at one end of the main body part 1 provided with the taper lead-in structure 3, the guide part 2 is detachably connected with the main body part 1, can be replaced in time after being worn and torn, and can limit the processed round pipe, so that the special mold based on a double-direction necking of a round pipe is convenient to butt joint with the round pipe during processing;

[0035] The guide part 2 is provided with a guide structure 22 inside, and the guide structure 22 is communicated with the taper lead-in structure 3.

[0036] In the specific embodiment of the utility model, see Figures 1-3The guide portion 2 is installed on the end of the main body portion where the taper lead-in structure 3 is arranged by a bolt 21.

[0037] In the embodiment of the present application, as shown in Figures 1-3 The taper lead-in structure 3, the constant-diameter necking structure 4 and the end face stop limit structure 5 are all inner hole structures that are adapted to the outer diameter of the processed circular pipe 6.

[0038] The inner hole diameters and lengths of the taper lead-in structure 3, the constant-diameter necking structure 4, the end face stop limit structure 5 and the guide structure 22 are the same as the expected outer diameters and lengths of the two ends of the processed circular pipe.

[0039] According to different processing requirements, the taper lead-in structure 3, the constant-diameter necking structure 4 and the end face stop limit structure 5 can be processed into different sizes.

[0040] In the embodiment of the present application, as shown in Figures 1-3 The diameter of the end face stop limit structure 5 is smaller than that of the constant-diameter necking structure 5.

[0041] To adapt to the processing requirements, the diameter of the taper lead-in structure 3 is gradually changed.

[0042] The diameter of the constant-diameter necking structure 5 is equal to the small-diameter end of the taper lead-in structure 3.

[0043] The diameter of the guide structure 22 is equal to the large-diameter end of the taper lead-in structure 3.

[0044] In the first embodiment of the present application, as shown in Figures 1-3 By detachably connecting the guide portion 2 with the main body portion 1, the worn main body portion 1 can be replaced in time, the waste of materials is effectively reduced, and the processing cost is reduced.

[0045] In the second embodiment of the present application, Figures 1-3 The diameter of the guide structure 22 is gap-fitted with the outer diameter of the processed circular pipe 6.

[0046] A cold pressing die assembly comprises the special die based on the two-way necking of a circular pipe according to any one of the preceding embodiments.

[0047] The special die based on the two-way necking of a circular pipe is provided with two sets.

[0048] The two sets of the special die based on the two-way necking of a circular pipe are oppositely arranged.

[0049] Two sets of the special mold based on the double-direction necking of the circular tube are respectively installed at two ends of the processed circular tube.

[0050] In the second embodiment of the present application, Figures 1-3 After one positioning, the special mold based on the double-direction necking of the circular tube at two ends simultaneously performs cold necking, effectively improving the production efficiency.

[0051] Meanwhile, the error caused by the secondary positioning is avoided, thereby effectively improving the machining precision of the product.

[0052] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A special purpose die based on double necking of a circular tube for use on a cold press die assembly, characterized by: The special die based on the double-direction necking of the circular tube is installed at the end of the processed circular tube; The special die based on the double-direction necking of the circular tube comprises a main body part and a guide part; The main body part is internally provided with a taper guide-in structure, an equal-diameter necking structure and an end face stop limit structure in sequence; The guide part is detachably installed at the end of the main body part where the taper guide-in structure is arranged; The guide part is internally provided with a guide structure which is communicated with the taper guide-in structure.

2. A special die based on double necking of a circular tube as claimed in claim 1 characterized in that: The guide part is installed at the end of the main body part where the taper guide-in structure is arranged through bolts.

3. A special die based on double necking of a circular tube as claimed in claim 1 characterized in that: The taper guide-in structure, the equal-diameter necking structure, the end face stop limit structure and the guide structure are all internal hole structures which are adapted to the outer diameter of the processed circular tube.

4. A special die based on double necking of a circular tube as claimed in claim 1 characterized in that: The diameter of the end face stop limit structure is smaller than that of the equal-diameter necking structure; The taper guide-in structure has a gradually changing diameter; The diameter of the equal-diameter necking structure is equal to that of the small-diameter end of the taper guide-in structure; The diameter of the guide structure is equal to that of the large-diameter end of the taper guide-in structure.

5. A special die based on double necking of a circular tube as claimed in claim 3 or 4, characterized in that: The diameter of the guide structure is gap-fitted with the outer diameter of the processed circular tube.

6. A cold press mold assembly characterized by: The special die based on the double-direction necking of the circular tube comprises a main body part and a guide part; The special die based on the double-direction necking of the circular tube comprises a main body part and a guide part; The two sets of the special die based on the double-direction necking of the circular tube are oppositely arranged; The two sets of the special die based on the double-direction necking of the circular tube are respectively installed at the two ends of the processed circular tube.

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